(19)
(11)EP 3 288 408 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
17.06.2020 Bulletin 2020/25

(21)Application number: 16787085.6

(22)Date of filing:  27.04.2016
(51)Int. Cl.: 
A43B 13/14  (2006.01)
A43B 9/16  (2006.01)
A43B 13/16  (2006.01)
A43B 13/12  (2006.01)
A43B 7/32  (2006.01)
A43B 13/00  (2006.01)
A43B 3/00  (2006.01)
(86)International application number:
PCT/US2016/029597
(87)International publication number:
WO 2016/176351 (03.11.2016 Gazette  2016/44)

(54)

ROCKER SHOES, ROCKER SHOE DEVELOPMENT KIT AND METHOD

ABROLLSCHUHE, ABROLLSCHUHENTWICKLUNGSKIT UND VERFAHREN

CHAUSSURES À BASCULE, KIT ET PROCÉDÉ DE DÉVELOPPEMENT DE CHAUSSURE À BASCULE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 27.04.2015 US 201562153365 P

(43)Date of publication of application:
07.03.2018 Bulletin 2018/10

(73)Proprietor: United States Government as Represented by the Department of Veterans Affairs
Washington, District of Columbia 20420 (US)

(72)Inventors:
  • HANSEN, Andrew H.
    Washington, District of Columbia 20420 (US)
  • KOEHLER, Sara
    Washington, District of Columbia 20420 (US)
  • NICKEL, Eric
    Washington, District of Columbia 20420 (US)
  • SCHULTZ, Charles
    Washington, District of Columbia 20420 (US)

(74)Representative: FRKelly 
27 Clyde Road
Dublin D04 F838
Dublin D04 F838 (IE)


(56)References cited: : 
EP-A1- 1 785 048
US-A- 4 794 707
US-A1- 2010 263 228
US-A1- 2010 263 233
US-A- 4 771 768
US-A1- 2010 263 228
US-A1- 2010 263 233
US-A1- 2011 185 593
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    BACKGROUND


    Related Field



    [0001] The subject matter discussed herein relates generally to rocker shoes for treatment of foot and ankle problems, and is particularly concerned with a rocker shoe development kit and method for construction of rocker shoes for medical applications.

    Related Background



    [0002] Rocker modifications to shoes are commonly prescribed for treatment of numerous foot and ankle problems. Currently, the prescriptions are based primarily on theory and clinical experience, with limited science and validation (see "The Biomechanics and clinical efficacy of footwear adapted with rocker profiles- Evidence in the literature" by Hutchins, S. et al., The Foot, 19:165-170, 2009). Current rocker shoe design is a clinical art, with minimal guidelines for clinicians to follow for specific shoe designs. Rocker shoes are prescribed for a variety of medical reasons, including redistribution of plantar pressures away from bony prominences of the foot (e.g. for persons with sensation loss and risk of skin breakdown), and reduction of foot and ankle movements (e.g. for persons with pain at the tibiotalar or metatarsophalangeal joints).

    [0003] A recent study suggests that humans adapt their ankle motion when wearing shoes with different rocker profiles to achieve a similar ankle-foot-shoe roll-over shape (see "Response of able-bodied persons to changes in shoe rocker radius during walking: Changes in ankle kinematics to maintain a consistent roll-over shape" by Wang CC, Hansen AH, Journal of Biomechanics, 43(12), 2288-93, 2010). US Pat. App. Pub. No. 2010/0263233 of Hansen et al. describes a system for determining a rocker sole profile for a prescribed ankle motion. One problem with current custom rocker shoe construction is that it is difficult and time consuming to produce rocker shoes for specific conditions in a systematic and repeatable fashion.

    [0004] US2010263228 (A1) discloses a sole for shoes enabling exchange of a shock-absorbing member, in which a shock-absorbing member can be exchanged with one suited to each situation whenever necessary depending on the state of a wearer's feet, the condition of a road surface, the walking motion, or the like even in a state where a shoe has been manufactured and is worn by the wearer, thereby further improving convenience in use. Since the shoe sole 100 includes the hollow space portion formed laterally at the inside thereof, any one selected from the group consisting of the air bag, the cushion member and the spring can be exchangeably employed as the shock-absorbing member so to be suited to each situation whenever necessary depending on the state of a wearer's feet, the condition of a road surface, the walking motion, or the like, thereby further improving convenience in use.

    SUMMARY



    [0005] The present disclosure provides a rocker shoe construction kit as detailed in claim 1, a rocker shoe according to claim 12, and a method of construction of a rocker shoe according to claim 14. Advantageous features are provided in dependent claims.

    [0006] In one aspect, the development kit also comprises a pair of shoe uppers each having a sole with a lower or plantar surface which has a flat surface portion extending along at least part of the length of the sole from the heel towards the toe of the shoe upper for securing to the upper surface of the rocker piece. Alternatively, sole portions of an existing shoe may be cut to form the flat surface portion for attachment to the rocker member. In one aspect the rocker member may be oversized in the transverse plane such that after attachment to the shoe, the excess transverse rocker member material may be ground down to match the transverse profile of the shoe. In one aspect, the development kit also includes a dual last jig for holding a pair of shoes while the soles are cut to form the flat surface portions.

    [0007] In one aspect, the sole of the existing shoe uppers and the rocker piece or member are provided with indicators for lining up the rocker piece with the ankle region of the shoe, i.e. the region where the ankle joint is expected to be located for persons with normal anatomy.

    [0008] According to another aspect, a pair of rocker shoes are provided which are designed so that little or no motion is produced at the ankle during the single-limb support phase of walking, i.e. the period of highest compressive load. Each rocker shoe has a heel, a toe, and a sole with a lower rocker surface extending from the heel towards the toe. The rocker surface may extend over the entire plantar surface of the shoe or may terminate at a predetermined location short of the toe of the shoe. In one embodiment, the rocker surface terminates at a location corresponding to the first metatarsal phalangeal joint, which is generally located at around 75 to 80% of the length of the sole from the heel. In one aspect, the sole is formed from multiple layers attached to the existing shoe sole, comprising a rocker piece of rigid or semi-rigid material secured to the lower surface of the existing shoe sole and extending from the heel towards the toe of the shoe, a cushioning or intermediate layer secured to the lower surface of the rocker piece and following the shape of the rocker surface, and a tread layer secured to the lower surface of the cushioning layer and conforming to the shape of the cushioning layer. In one embodiment, the rocker surface is curved and has a predetermined rocker radius dependent on a wearer's height. The rocker piece may cover the entire plantar surface of the shoe or may cover only a portion of the plantar surface to produce a lower profile or lower height design.

    [0009] In one embodiment, one or more inserts of different material from the rocker piece may be mounted in one or more cut-outs in the lower surface of the rocker piece between the rocker piece and cushioning layer. The inserts may be of highly damped material or comprise enclosures filled with a shear-thickening fluid or shear-thinning fluid. In the highly damped materials or shear-thickening case, the insert is designed to deform slowly into a flattened geometry during static loads associated with standing. In the shear-thinning case, inserts containing shear-thinning fluids may comprise the intermediate layer, and the shear-thinning fluid is designed to be stable under static loads and more fluid during dynamic loading.

    [0010] Other features and advantages will become more readily apparent to those of ordinary skill in the art after reviewing the following detailed description and the accompanying drawings.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0011] 

    FIG. 1 is an exploded side elevation view illustrating parts of one embodiment of a rocker shoe development kit;

    FIG. 2A is a side elevation view of a dual shoe last jig for use in preparing the shoe upper part of the rocker shoe development kit of FIG. 1;

    FIG. 2B is a side elevation view of the dual last jig of FIG. 2A with a pair of shoes located on the two shoe lasts or prosthetic feet prior to preparation;

    FIG. 2C is a side elevation view similar to FIG. 2B showing the shoes after the soles have been partially cut off to leave a flat base for connection of rocker pieces to the flat base;

    FIG. 3 is a side elevation view of a rocker shoe produced with the kit of FIGS. 1 and 2;

    FIG. 4 is an exploded side elevation view of a rocker shoe development kit according to another embodiment, which is designed to produce a rocker shoe for better natural immobilization of the ankle during the single-limb stance or support phase of walking;

    FIG. 5 is a bottom plan view of the rocker piece or member of FIG. 4;

    FIG. 6 is a side elevation view of one embodiment a rocker shoe for natural immobilization of the ankle constructed using the kit of FIG. 4;

    FIG. 7 illustrates graphical data from a user walking with a normal pair of shoes with a flat sole and with a pair of the rocker shoes of FIG. 6;

    FIG. 8 is an exploded side elevation view illustrating another embodiment of a rocker shoe development kit for producing a rocker shoe for natural immobilization of the ankle with an insert having high damping or shear-thickening properties for added stability during standing;

    FIG. 9 is a bottom plan view of the rocker piece of FIG. 8 showing the insert positioned in the cut out extending across the width of the rocker piece;

    FIG. 10 is a side elevation view illustrating an embodiment of a rocker shoe constructed using the kit of FIG. 8;

    FIG. 11A is a side elevation view of the rocker shoe of FIG. 10 being worn during a dynamic phase of walking;

    FIG. 11B is a side elevation view similar to FIG. 11A illustrating a condition of the shoe when the wearer is standing in a static position;

    FIG. 12 is an exploded side elevation view illustrating another modified embodiment of a rocker shoe development kit with shear-thinning elements for added stability during standing.

    FIG. 13 is a side elevation view illustrating a rocker shoe constructed using the kit of FIG. 12, with a wearer of the shoe in a stationary, standing position;

    FIG. 14 is a side elevation view similar to FIG. 13 but with the wearer at the end of the swing phase of walking with the right foot;

    FIG. 15 is a side elevation view illustrating the shoe at the early stance phase of walking;

    FIG. 16 is a side elevation view similar to FIG. 15 but illustrating the mid-stance phase of a walking step; and

    FIG 17 is a side elevation view similar to FIG. 15 and 16 but illustrating the late stance phase of the walking step.


    DETAILED DESCRIPTION



    [0012] The subject matter described herein is taught by way of example implementations. Various details have been omitted for the sake of clarity and to avoid obscuring the subject matter. The examples shown and described below are directed to new rocker shoe designs and to a rocker shoe development kit designed to produce rocker shoes of any design in a more consistent fashion.

    [0013] Although some of the embodiments described below are concerned with kits for construction of rocker shoes for medical applications, and with rocker shoes which may be produced with the kits or by other means, it will be understood that a similar kit may be designed for manufacturing other types of footwear intended for non-custom medical and consumer markets.

    [0014] FIG. 1 illustrates one embodiment of a rocker shoe development kit or assembly 10 which comprises a prepared shoe upper 12, a rocker piece or rocker member 14, a cushioning layer 15, and a tread layer 16. Although only one rocker shoe assembly is illustrated, the kit includes a pair of shoe uppers and corresponding rocker members, cushioning layers, and tread layers for a pair of right and left rocker shoes. Although this embodiment includes a pre-prepared shoe upper 12, in an alternative embodiment the kit may comprise only the rocker members 14 cushioning layers 15, and tread layers 16 for a pair of shoes, and the shoe uppers may be prepared as needed from shoes which are cut to form a flat surface portion on the sole for attachment of the shoe kit parts. FIG. 1 illustrates one example of a kit for producing a predetermined rocker profile as illustrated in FIG. 3 when assembled, but it will be understood that the same basic kit may be provided with rocker pieces of different shapes to produce different rocker profiles, and an example of an alternative rocker profile kit is provided in FIGS. 4 and 5, as described in more detail below. Rocker kits of various different profiles may be provided for different prescribed ankle angular motion, so that the medical professional can choose the kit which has the appropriate rocker profile for a specific patient. Embodiments of this invention include kits in a range of different rocker shoe profiles so that an appropriate kit can be selected for a patient based on height and the desired rocker motion.

    [0015] In one embodiment, where the kit does not already include a prepared shoe upper or left and right shoe uppers, it may also include a dual last jig 18 as illustrated in FIG. 2A. In FIG. 2A, the jig 18 comprises two foot-shaped forms 20 connected together by connecting rod 22, with the soles of the foot forms extending parallel to one another. Alternatively, foot forms 20 may be replaced by adjustable size shoe lasts so that different size shoes may be pre-cut on the jig. The jig allows a pair of shoes to be secured so that the bottom soles of the two shoes are perpendicular with the table top of a band saw and parallel with the band saw blade. A pair of shoes 24 are secured on the respective prosthetic feet or lasts 20 as illustrated in FIG. 2B. The sole 26 of each shoe is then cut with the band saw to form a flat surface portion or base 28 (see FIG. 2C) for connection of the structural rocker pieces 14 to the respective soles.

    [0016] As illustrated in FIG. 1, in one embodiment each prepared shoe upper 12 has a sole 26 with a flat surface portion 28 extending from the heel 29 along at least part of the length of the shoe up to a predetermined position 30 short of the toe end 32 of the shoe. In one embodiment, flat surface portion 28 extends up to 75% or 80% of the length of the shoe and position 30 may be at a location which at least substantially corresponds to the first metatarsal phalangeal joint of the toes of a wearer of the shoe. A marker or indicator line 34 is provided on one or both of the opposite side faces of the sole at a position aligned with the ankle region of the shoe, i.e. the region where the ankle joint is expected to be located for persons with normal anatomy.

    [0017] In some embodiments, rocker piece or member 14 is made of a rigid or semi-rigid non-deforming material such as plastic, hard foam, hard crepe, or the like. The material is selected to be relatively lightweight to keep the shoes light in weight. In one embodiment, the rocker piece was made from Ultem® plastic material, but other materials with similar properties may be used in alternative embodiments. The rocker piece has a profile or outer periphery designed to follow the profile of the planter surface of the shoe sole up to break point 36 at the tip of the rocker piece. Upper surface 38 is flat, and the lower surface 40 in this embodiment is also flat up to point 42, after which an upward taper 44 extends from point 42 to break point 36. The rear end 45 of rocker piece 14 has a slight inward taper. In some embodiments, a marker or indicator line 46 is provided on one or both of the opposite side faces 48 of the rocker piece for proper alignment of the rocker surface with the ankle region of the shoe, i.e. at the location on the rocker piece which is intended for alignment with the region where the ankle joint is expected to be located for persons with normal anatomy when the shoe is worn. In some embodiments, the rocker piece has transverse plane dimensions which exactly match those of the flat-bottomed shoe upper up to a position close to or at break point or the forward end 30 of the flat lower surface of the sole, and covers the portion of the plantar surface of the sole from the heel up to break point 36, which is positioned slightly rear of forward end 30 of the flat sole portion in the embodiment of Figs. 1 and 3. In other embodiments, the rocker piece may cover more of the plantar surface, up to the entire plantar surface of the sole of the shoe.

    [0018] In one embodiment of a method of constructing rocker shoes for medical applications, the line 46 on the rocker piece is aligned with line 34 on the corresponding side face of the shoe sole of a prepared shoe upper 12 before securing the rocker piece 14 to the flat lower surface portion 28 of the shoe sole with glue or the like. Any part of the rocker piece which then extends beyond the heel of the shoe is ground away in the transverse plane, without any modification to the plantar features of the rocker piece. Cushioning layer 15 is then attached to the lower surface of the rocker piece, and the tread layer 16 is attached over the lower surface of the cushioning layer and exposed forward end portion of the shoe sole.

    [0019] In some embodiments, cushioning layer 15 is made of a suitable cushioning material such as soft crepe or foam and is designed to cover the entire lower surface 40 of rocker piece 14. Layer 15 is of uniform thickness and has a forward end taper 50 to match the selected rocker profile. The layer 15 also matches the rocker piece and flat lower surface of the shoe in transverse plane shape, and is designed to be attached to the lower surface of rocker piece 14 by adhesive or the like. A flat upper end face 35 is adhered to the forward end of the flat sole portion of the shoe in front of break point 36 of rocker piece 14, as seen in Fig. 3. Tread layer 16 comprises a piece of rubber tread designed to be glued onto the bottom of the crepe or cushioning layer 15 and forward end portion of the sole of the shoe, up to the toe, and covers the entire lower surface of the shoe and attached rocker piece and cushioning layer. The rubber tread protects the cushioning layer from premature breakdown and is also designed to provide an appropriate level of friction between the shoe and the walking surface.

    [0020] FIG. 3 illustrates the assembled rocker shoe 52. Unlike a conventional rocker shoe, the rocker piece in this shoe does not extend to the toe, but terminates at or close to the location of the first metatarsal phalangeal joint of a person wearing the shoe. This reduces the height of the rocker shoe for improved cosmetics and safety.

    [0021] In some embodiments, a shoe company may provide rocker shoe assembly kits of different shoe sizes having a variety of shoe designs to accommodate the cosmetic preference of various users, including both right and left shoe uppers along with corresponding right and left rocker pieces, cushioning layers, and tread material layers. In some embodiments, flat and consistent sole portions 28 are formed on every shoe upper for simple modification by the shoe technician to add the corresponding rocker piece, cushioning layer and tread layer. Every shoe upper may be provided with indicator line 34 aligned with the expected ankle joint position for correct alignment of the shoe with the rocker piece to be attached under the sole. In this case, the dual-last jig is not necessary.

    [0022] The kit of the above embodiment is designed to provide a rocker surface which terminates short of the toe end of the shoe. In other embodiments, the rigid or semi-rigid rocker pieces may cover the entire plantar surface of the shoe sole from the heel to the toe of the shoe, along with the underlying cushioning and tread layers. It will be understood that kits will be provided in a range of different shoe sizes (length and width).

    [0023] FIGS. 4 to 6 illustrate another embodiment of a rocker shoe 55 (FIG. 6) and rocker shoe assembly kit 56 (FIG. 4 and 5). The shoe upper 12 in this embodiment is the same as in the previous embodiment, and like reference numbers are used for like parts as appropriate. Kit 56 also comprises rocker piece 58, cushioning layer 60, and tread layer 62, which are of the same or similar materials to the corresponding parts of the kit of the previous embodiment, but of different shapes. The upper surface 59 of rocker piece 58 is flat. In this embodiment, rather than a lower surface which is flat and has a tapered forward end as in the previous embodiment, the rocker piece 58 has a curved, convex lower surface 64 extending from rear end 65 up to break point 66. An indicator line 68 is provided for alignment with ankle joint indicator line 34 on the shoe upper 12. As in the previous embodiment, the rocker piece covers most of the flat lower surface portion of sole 26 with break point 66 spaced from the forward end of the flat surface portion of the sole (see FIG. 5), terminating short of the toe to reduce overall height of the rocker shoe 55. In an alternative embodiment, the curved rocker piece may extend over the entire length of the shoe.

    [0024] The cushioning layer 60 is of any suitable cushioning material such as crepe or plastic foam material, as in the previous embodiment, and may be formed into a curved shape matching the curvature of the lower surface 64 of rocker piece 58, with a flat, upwardly facing forward end portion 70. Forward end portion 70 is designed to be adhered to the forward end of the flat lower surface portion 28 of sole 26 in front of the forward end of rocker piece 58 when the parts are assembled as in FIG. 6. Tread layer 62 forms a lower tread surface 72 of rocker shoe 55, and is secured over the lower surface 64 of cushioning layer 60 with a forward portion 75 secured to the curved sole portion of the shoe upper between the forward end of the cushioning layer and the toe 32 of the shoe. In one embodiment, layer 60 is of deformable material which adopts the curvature of the lower surface of rocker piece 58 when adhered to that surface. The parts are glued together in turn using a suitable adhesive, as described above in connection with FIGS. 1 and 3.

    [0025] Rocker shoe 55 is designed to reduce ankle motion during walking, particularly during the part of a walking gait cycle when forces on the leg are highest. This is during the single-limb support portion of a walking step when the foot engages the ground at the heel and rocks onto the toes. FIG. 7 is a graphical plot which compares ankle range of motion variation over a gait cycle for a wearer when wearing a normal shoe (black circles) and when wearing the rocker shoe (black squares). The single-limb stance or support phase of the gait cycle is between the vertical lines. In some embodiments, compared to the normal shoe (upper line between vertical lines), the rocker shoe of FIG. 6 (lower line between vertical lines) reduces ankle range of motion from approximately 12 degrees to less than five degrees during the period of the gait cycle when forces on the ankle are highest. Thus, the rocker shoes of FIG. 6 reduce ankle motion or produce natural immobilization of the ankle during the stance limb support time when the forces on the leg are highest, potentially reducing ankle pain. In one embodiment, the rocker radius of the rocker shoe of FIG. 6 ranges from 10%-25% of a patient's height, with a median of around 16% of the patient's height. Kits of different rocker radius may be provided for patients of different heights or height ranges.

    [0026] FIG. 10 illustrates an embodiment of a modified rocker shoe 80 which is similar to the shoe of FIG. 6, but has an insert 85 designed to produce more stability during standing. FIG. 8 and 9 illustrate parts of a kit 82 which may be used for making the shoe of FIG. 10. The shoe upper 12, cushioning layer 60, and tread layer 62 of the kit 82 are identical to the corresponding parts of kit 56 of FIG. 4, and like reference numbers are used for like parts as appropriate. The rocker piece 58 of the previous embodiment is replaced by modified rocker piece 84 and insert 85. Rocker piece 84 is substantially the same shape as rocker piece 58, but part of the curved lower surface of the rocker piece has a cut out or arcuate recess 87 in which insert 85 is secured.

    [0027] Insert 85 has a lower surface of matching curvature to adjacent portions of the lower surface of the rocker piece, so that the lower surface of rocker piece 84 and insert 85 form a substantially uniform curved surface similar to curved surface 64 of the previous embodiment. The insert 85 is formed from a highly damped material that does not deform significantly during the dynamic loading associated with walking, and the rocker piece and insert therefore have substantially the same effect as curved surface 64 of the previous embodiment during normal walking (FIG. 11A). During static loads associated with standing, the insert slowly deforms and adopts a flattened geometry along with underlying portions of the cushioning and tread layers 60 and 62 (see reference number 92 in FIG. 11B). This provides more stability to the wearer while standing on floor 95 as seen in FIG. 11B, since an extended area of the tread surface is flat against floor 95 as compared to the previous embodiment where the user balances on the curved surface when standing still. In one embodiment, insert 85 comprises a plastic enclosure or bag filled with a shear-thickening or dilatant material or fluid such as silly putty, cornstarch and water, or silica nano-particles dispersed in a solution of polyethylene glycol. As illustrated in FIG. 9, the recess 87 extends across the entire width of rocker piece 84 and extends over around half the length of the rocker piece, from a location spaced slightly forward from marker line 90 which is aligned with the estimated position of a shoe wearer's ankle joint. The insert is therefore positioned in the area that the shoe wearer tends to keep their center of pressure during standing balance. This helps the wearer feel more stable when standing when wearing a pair of rocker shoes with curved profile. Thus, rocker shoe 80 is designed to provide a specific curved shape for walking, but flattens for stability during standing.

    [0028] FIG. 13 illustrates another embodiment of a rocker shoe 110 while FIG. 12 illustrates a kit of parts 100 for optional use in construction of shoe 110. Some parts of the kit in FIG. 12 are identical to those of FIG. 4, and like reference numbers are used for like parts as appropriate. Kit 100 includes shoe upper 12 with flattened sole surface 28 and a rocker piece 58 with a flat upper surface 59 for adhering to sole surface 28 and a curved lower surface 64. In this embodiment, cushioning layer 60 of the previous embodiments is replaced by a two part layer of shear thinning material. Tread layer 108 follows the shape of the bottom surface of the two part layer 105, 106 of shear thinning material, and is initially flat along most of its length from the rear end, with upwardly tapered portions 114, 115 up to the forward end.

    [0029] Rear part 105 and forward part 106 of the shear thinning layer are separate inserts in this embodiment, although they may be joined together by a thin connecting portion at their inner ends in an alternative embodiment. Rear part 105 is substantially wedge shaped with a curved upper surface 118 matching the curvature of the rear end portion of rocker piece 58. Forward part 106 has a flat lower surface 120 up to point 122, followed by tapered portions 123, 124 extending up to forward tip 125. The upper surface is curved from the inner end up to point 126 to match the curvature of the rocker piece 58 up to break point 66. The remainder 128 of the upper surface is successively tapered at steeper angles up to forward tip 125, and fits against the sole 26 between the forward end 66 of rocker piece 58 and the toe 32 when the shoe is assembled as in FIG. 13. In order to assemble the shoe, the upper surface 59 of rocker piece 58 is first glued to the lower flat surface 28 of sole 26. The shear thinning parts 105 and 106 are then glued to the lower surface 64 of rocker piece 58, with the forward portion of part 106 glued to the sole in front of rocker piece 58. Tread 108 is then secured over the rocker pieces and shoe sole to complete the construction.

    [0030] As noted above, the parts 105 and 106 are of shear thinning or pseudo plastic material which has a viscosity which decreases with increasing rate of shear strain and increases under static conditions. Each part comprises a suitably shaped flexible walled enclosure containing a shear thinning fluid such as a polymer solution. The enclosure walls are designed to deform under pressure. As illustrated in FIG. 13, when a wearer of the shoe 110 is in a stationary standing position on surface 95 with no shear strain, the viscosity of the fluid in enclosures 105, 106 is at a maximum value and there is no compression of the enclosures, so that the bottom surface of the shoe is flat along most of its length. When the user is walking, the shoe heel touches the ground 95 as in FIG.15 after the end of the swing phase (illustrated in FIG. 14). This causes compression of the wedge shaped rear part 105 due to thinning of the fluid in that part, so that the part and the underlying portion of the tread layer adopt a curved shape similar to the curved portion of the overlying rigid or semi-rigid rocker piece. FIG. 15 illustrates an early stance phase of the ground engaging part of a walking step. As the step continues, the user rocks forward and the shear strain applied to the part 105 is removed, so that lower surface of the shoe returns to its original conformation against the ground or floor surface 95, as illustrated in FIG. 16. This is the mid-stance phase of the walking step. The user's foot then rocks from the heel to the toe in the late stance phase of FIG. 17, so that the forward part 106 becomes compressed and conforms to the overlying part of the curved lower surface 64 of rocker piece 58 along with the underlying part of the tread layer, producing more of a rocking motion.

    [0031] In some embodiments, the rocker development kits described above can be manufactured and sold in various configurations, with or without pre-formed shoe uppers, and allow rocker shoes to be produced in a more systematic and repeatable fashion. In addition, the rocker shoes of FIGS. 6, 10 and 13 lead to natural immobilization of the ankle during the single limb stance phase of walking, and are of reduced height relative to conventional rocker shoes of the same rocker radius, since the rocker pieces do not cover the entire plantar surface of the shoe. In the above embodiments, the rocker pieces have an indicator for alignment with the shoe wearer's ankle via a matching indicator on the shoe sole, for better ankle immobilization. In some of the above embodiments, the rocker pieces incorporate one or more stability inserts for better balance of the wearer when standing still.

    [0032] In some embodiments, the dimensions (radius and height) of the rocker profile of the rocker kits described above are scaled to the patient's dimensions and can be expressed as a percentage of body height or foot length. In terms of body height, the rocker radius ranges from 10%-25% of a patient's height (the median radius is 16% of body height), which is approximately 66%-164% of the patient's foot length. The height of rocker profile depends on the radius selected as well as the distance between the patient's heel and metatarsophalangeal (MTP) joint. Selecting a larger radius also reduces the build height of the rocker. Rocker kits of different rocker radius may be provided for patients of different heights.


    Claims

    1. A rocker shoe construction kit (10, 100), comprising
    a rocker piece (14, 58) of rigid or semi-rigid material having an upper surface (38) configured for securing over a major portion of a lower plantar surface of the sole (26, 28) of a shoe (24) extending from the heel (29) towards the toe (32) of the shoe (24), and a lower surface (40) of predetermined rocker shape;
    an intermediate layer for securing over the lower surface (40) of the rocker piece (14, 58); and
    a layer of tread material (16) configured for securing over the lower surface of the intermediate layer and any exposed portion of the plantar surface of a shoe (24) to which the kit (10) is secured; characterized in that,
    the intermediate layer comprises one or more enclosures containing a shear thinning fluid.
     
    2. The kit (10, 100) of claim 1, further comprising a shoe upper (12) having a sole (28) with a plantar surface which has a flat surface portion extending along at least part of the length of the sole (26, 28) from the heel (29) towards the toe (32) of the shoe upper, the upper surface (59) of the rocker piece (14, 58) also being flat.
     
    3. The kit (10, 100) of claim 1, wherein the rocker piece (14, 58), the intermediate layer, and the layer of tread material (16) are configured for securing to the lower plantar surface of a sole of a left shoe upper and further comprising a rocker piece (14, 58), a second intermediate layer and a second layer of tread material configured for securing to the lower plantar surface of a sole of a right shoe upper.
     
    4. The kit (10, 100) of claim 3, further comprising the left shoe upper and the right shoe upper, wherein the lower plantar surface of each of the soles (26, 28) of the left and right shoe uppers has a flat surface portion extending along at least part of the length of the sole (26, 28) from the heel (29) towards the toe (32) of the respective left and right shoe uppers, the upper surfaces of the respective first rocker piece and second rocker piece also being flat.
     
    5. The kit (10, 100) of claim 2, wherein at least one side of the sole of the shoe upper has a first indicator (34, 46) at least approximately aligned with an ankle joint of a wearer of the shoe (24), and a corresponding side of the rocker piece has a corresponding second indicator (34, 46) for alignment with the first indicator (34, 46) when the rocker piece (14, 58) is secured to the sole.
     
    6. The kit (10, 100) of claim 1, wherein the lower surface (40) of the rocker piece is curved and the intermediate and tread layers are configured to conform to the curvature of the curved lower surface (40) when the rocker piece (14, 58) and the intermediate and tread layers are assembled.
     
    7. The kit (10, 100) of claim 6, wherein the curvature of the lower surface (40) of the rocker piece is selected to form a rocker radius in the range from 10%-25% of a wearer's height, or wherein the lower surface (40) of the rocker piece has at least one indent extending across the width of the surface (40), and at least one deformable insert configured for securing in the indent and containing a shear thickening fluid or a highly damped material which deforms under static load, the insert having a curved lower surface in a non-deformed condition during walking and a flattened lower surface when deformed under static load when a wearer is standing, whereby an area of the underlying tread surface (16) is flattened.
     
    8. The kit (10, 100) of claim 1, wherein the shear thinning fluid has a maximum viscosity at which it is at least substantially non-compressible under static conditions, whereby the intermediate layer has a flat lower surface portion extending from the heel (29) and terminating short of the toe (32) of the shoe under static conditions, and is progressively compressed when a wearer of the shoe is walking.
     
    9. The kit (10, 100) of claim 1, wherein the intermediate layer comprises a cushioning layer (15), and wherein the lower surface (40) of the rocker piece (14, 58) meets the upper surface (38) at a forward break point (36), and the upper surface of the cushioning layer (15) is of matching shape to the lower surface (40) of the rocker piece (14, 58) up to the forward break point (36), and has a flat upper end face configured for adhering to the lower plantar surface of the sole (28) of the shoe in front of the break point (36) of the rocker piece (14, 58).
     
    10. The kit (10, 100) of claim 9, wherein the intermediate layer comprises a cushioning layer (15), and wherein the lower surface (40) of the rocker piece (14, 58) and the upper surface of the cushioning layer (15) are one of matching, curved shape up to the flat upper end face, or matching, angular shape up to the flat upper end face, the angular shape comprising a flat surface portion extending from a heel end towards a forward end, and an upwardly tapered portion extending from the flat surface portion to the forward break point (36) and flat upper end face of the rocker piece (14, 58) and cushioning layer (15), respectively.
     
    11. The kit (10, 100) of claim 1, further comprising a dual last jig (18) for holding a pair of shoes (24) while the soles (26) are cut to form flat surface portions for securing to an upper surface (38) of a rocker piece (14, 58).
     
    12. A rocker shoe (52, 55) constructed using the kit (10, 100) of any of claims 1 to 11, comprising:

    a shoe upper (12) having a heel (29), a toe (32), and a sole (26);

    a rocker portion with a lower rocker surface (40) extending over at least a major portion of the sole;

    the rocker portion comprising a rocker piece (14, 58) of rigid or semi-rigid material having an upper surface (38) secured to the lower plantar surface of the shoe and a lower surface (40), an intermediate layer secured over the lower surface (40) of the rocker piece, and a layer of tread material (16) secured over the lower surface of the intermediate layer and over any exposed portion of the plantar surface of the shoe (24); characterized in that,

    the intermediate layer comprises one or more enclosures containing a shear thinning fluid.


     
    13. The rocker shoe (52, 55) of claim 12, further comprising one or more inserts of compressible material mounted in one or more cut-outs in the lower surface (40) of the rocker piece (14, 58), the intermediate layer extending over the lower surface (40) of the rocker portion and inserts.
     
    14. A method of constructing a rocker shoe (52, 55) according to any of claims 1-13, comprising:

    attaching an upper surface (38) of a rocker piece (14, 58) of rigid or semi-rigid, non-deformable material to the lower surface of the sole (26) of a shoe upper with a rear end of the rocker piece (14, 58) at the heel (29) of the shoe upper and the forward end spaced from the toe (29) of the shoe upper;

    attaching an intermediate layer of different material from the rocker piece (14, 58) over a lower surface (40) of the rocker piece, wherein the intermediate layer comprises one or more enclosures containing a shear thinning fluid; and

    attaching a layer of tread material (16) over a lower surface of the intermediate layer and any exposed portion of the sole (26) of the shoe in front of the rocker piece (14, 58) and intermediate layer.


     


    Ansprüche

    1. Abrollschuhbaukit (10, 100), Folgendes umfassend:

    ein Abrollstück (14, 58) aus starrem oder halbstarrem Material, das eine obere Fläche (38), die dazu konfiguriert ist, über einem Hauptteil einer unteren plantaren Fläche der Sohle (26, 28) eines Schuhs (24) befestigt zu werden, die sich von dem Absatz (29) zur Spitze (32) des Schuhs (24) hin erstreckt, und eine untere Fläche (40) von vorbestimmter Abrollform aufweist; eine Zwischenschicht zum Befestigen über der unteren Fläche (40) des Abrollstücks (14, 58); und

    eine Schicht Laufflächenmaterial (16), die dazu konfiguriert ist, über der unteren Fläche der Zwischenschicht und jedes freiliegenden Abschnitts der plantaren Fläche eines Schuhs (24) befestigt zu werden, an dem das Kit (10) befestigt ist; dadurch gekennzeichnet, dass

    die Zwischenschicht eine oder mehrere Kammern umfasst, die ein strukturviskoses Fluid enthalten.


     
    2. Kit (10, 100) nach Anspruch 1, ferner einen Schuhschaft (12) umfassend, der eine Sohle (28) mit einer plantaren Fläche aufweist, die einen flachen Flächenabschnitt aufweist, der sich entlang mindestens eines Teils von der Länge der Sohle (26, 28) von dem Absatz (29) zu der Spitze (32) des Schuhschafts hin erstreckt, wobei die obere Fläche (59) des Abrollstücks (14, 58) ebenfalls flach ist.
     
    3. Kit (10, 100) nach Anspruch 1, wobei das Abrollstück (14, 58), die Zwischenschicht und die Schicht Laufflächenmaterial (16) dazu konfiguriert sind, an der unteren plantaren Fläche einer Sohle eines linken Schuhschafts befestigt zu werden und ferner ein Abrollstück (14, 58), eine zweite Zwischenschicht und eine zweite Schicht Laufflächenmaterial umfassend, die dazu konfiguriert sind, an der unteren plantaren Fläche einer Sohle eines rechten Schuhschafts befestigt zu werden.
     
    4. Kit (10, 100) nach Anspruch 3, ferner den linken Schuhschaft und den rechten Schuhschaft umfassend, wobei die untere plantare Fläche von jeder der Sohlen (26, 28) des linken und rechten Schuhschafts einen flachen Flächenabschnitt aufweist, der sich entlang mindestens eines Teils von der Länge der Sohle (26, 28) von dem Absatz (29) zu der Spitze (32) des linken bzw. rechten Schuhschafts hin erstreckt, wobei die obere Fläche des ersten Abrollstücks bzw. des zweiten Abrollstücks ebenfalls flach ist.
     
    5. Kit (10, 100) nach Anspruch 2, wobei mindestens eine Seite der Sohle des Schuhschafts einen ersten Indikator (34, 46) aufweist, der zumindest annähernd an einem Sprunggelenk eines Trägers des Schuhs (24) ausgerichtet ist, und eine entsprechende Seite des Abrollstücks einen entsprechenden zweiten Indikator (34, 46) zum Ausrichten an dem ersten Indikator (34, 46) aufweist, wenn das Abrollstück (14, 58) an der Sohle befestigt ist.
     
    6. Kit (10, 100) nach Anspruch 1, wobei die untere Fläche (40) des Abrollstücks gebogen ist und die Zwischenschicht und die Laufflächenschicht dazu konfiguriert sind, sich der Biegung der gebogenen unteren Fläche (40) anzupassen, wenn das Abrollstück (14, 58) und die Zwischenschicht und die Laufflächenschicht zusammengefügt sind.
     
    7. Kit (10, 100) nach Anspruch 6, wobei die Biegung der unteren Fläche (40) des Abrollstücks ausgewählt ist, um einen Abrollradius im Bereich von 10 %-25 % der Größe eines Trägers zu bilden oder wobei die untere Fläche (40) des Abrollstücks mindestens eine Kerbe, die sich über die Breite der Fläche (40) erstreckt, und mindestens einen deformierbaren Einsatz aufweist, der zum Befestigen in der Kerbe konfiguriert ist und ein dilatantes Fluid oder ein hochgedämpftes Material enthält, das sich unter statischer Last deformiert, wobei der Einsatz eine gebogene untere Fläche in einem während des Gehens nicht deformierten Zustand aufweist, und eine abgeflachte untere Fläche aufweist, wenn er unter statischer Last deformiert wird, wenn ein Träger steht, wobei ein Bereich der darunterliegenden Lauffläche (16) abgeflacht wird.
     
    8. Kit (10, 100) nach Anspruch 1, wobei das strukturviskose Fluid eine maximale Viskosität aufweist, bei der es unter statischen Bedingungen zumindest nicht wesentlich komprimierbar ist, wobei die Zwischenschicht einen flachen unteren Flächenabschnitt aufweist, der sich von dem Absatz (29) aus erstreckt und unter statischen Bedingungen kurz vor der Spitze (32) des Schuhs endet und fortschreitend komprimiert wird, wenn ein Träger des Schuhs geht.
     
    9. Kit (10, 100) nach Anspruch 1, wobei die Zwischenschicht eine Polsterschicht (15) umfasst und wobei die untere Fläche (40) des Abrollstücks (14, 58) die obere Fläche (38) an einem vorderen Unterbrechungspunkt (36) trifft und die obere Fläche der Polsterschicht (15) eine Form aufweist, die zu der unteren Fläche (40) des Abrollstücks (14, 58) bis zu dem vorderen Unterbrechungspunkt (36) passt, und eine flache obere Endfläche aufweist, die dazu konfiguriert ist, an der unteren plantaren Fläche von der Sohle (28) des Schuhs vor dem Unterbrechungspunkt (36) des Abrollstücks (14, 58) zu haften.
     
    10. Kit (10, 100) nach Anspruch 9, wobei die Zwischenschicht eine Polsterschicht (15) umfasst und wobei die untere Fläche (40) des Abrollstücks (14, 58) und die obere Fläche der Polsterschicht (15) entweder von passender, gebogener Form bis zu der flachen oberen Endfläche oder von passender, eckiger Form bis zu der flachen oberen Endfläche sind, wobei die eckige Form einen flachen Flächenabschnitt, der sich von einem Absatzende hin zu einem Vorderende erstreckt, und einen sich nach oben verjüngenden Abschnitt umfasst, der sich von dem flachen Flächenabschnitt jeweils zu dem vorderen Unterbrechungspunkt (36) und der flachen oberen Endfläche des Abrollstücks (14, 58) und der Polsterschicht (15) erstreckt.
     
    11. Kit (10, 100) nach Anspruch 1, ferner eine zweifache Vorspannvorrichtung (18) umfassend, zum Halten eines Paars Schuhe (24), während die Sohlen (26) geschnitten werden, um flache Flächenabschnitte zum Befestigen an einer oberen Fläche (38) eines Abrollstücks (14, 58) zu bilden.
     
    12. Abrollschuh (52, 55), der durch Verwenden des Kits (10, 100) nach einem der Ansprüche 1 bis 11 gebaut wird, Folgendes umfassend:

    einen Schuhschaft (12), der einen Absatz (29), eine Spitze (32) und eine Sohle (26) aufweist;

    einen Abrollabschnitt mit einer unteren Abrollfläche (40), die sich über mindestens einen Hauptabschnitt der Sohle erstreckt;

    einen Abrollabschnitt, der ein Abrollstück (14, 58) aus starrem oder halbstarrem Material umfasst, das eine obere Fläche (38), die an der unteren plantaren Fläche des Schuhs und einer unteren Fläche (40) befestigt ist, und eine Zwischenschicht, die über der unteren Fläche (40) des Abrollstücks befestigt ist, und eine Schicht Laufflächenmaterial (16), die über der unteren Fläche der Zwischenschicht und über jedem freiliegenden Abschnitt der plantaren Fläche des Schuhs (24) befestigt ist, aufweist;

    dadurch gekennzeichnet, dass

    die Zwischenschicht eine oder mehrere Kammern umfasst, die ein strukturviskoses Fluid enthalten.


     
    13. Abrollschuh (52, 55) nach Anspruch 12, ferner einen oder mehrere Einsätze aus komprimierbarem Material umfassend, die in einer oder mehreren Aussparungen in der unteren Fläche (40) des Abrollstücks (14, 58) montiert sind, wobei sich die Zwischenschicht über die untere Fläche (40) des Abrollstücks und der Einsätze erstreckt.
     
    14. Verfahren zum Bau eines Abrollschuhs (52, 55) nach einem der Ansprüche 1-13, Folgendes umfassend:

    Anbringen einer oberen Fläche (38) eines Abrollstücks (14, 58) aus starrem oder halbstarrem, nicht deformierbarem Material an der unteren Fläche der Sohle (26) eines Schuhschafts, wobei sich ein hinteres Ende des Abrollstücks (14, 58) an dem Absatz (29) des Schuhschafts befindet und das Vorderende von der Spitze (29) des Schuhschafts beabstandet ist;

    Anbringen einer Zwischenschicht, die aus einem anderen Material besteht als das Abrollstück (14, 58), über einer unteren Fläche (40) des Abrollstücks, wobei die Zwischenschicht eine oder mehrere Kammern umfasst, die ein strukturviskose Fluid enthalten; und

    Anbringen einer Schicht Laufflächenmaterial (16) über einer unteren Fläche der Zwischenschicht und jedem freiliegenden Abschnitt der Sohle (26) des Schuhs vor dem Abrollstück (14, 58) und der Zwischenschicht.


     


    Revendications

    1. Kit de construction de chaussure à bascule (10, 100), comprenant
    une pièce de bascule (14, 58) d'une matière rigide ou semi-rigide ayant une surface supérieure (38) configurée pour se fixer par-dessus une portion principale d'une surface plantaire inférieure de la semelle (26, 28) d'une chaussure (24) s'étendant depuis le talon (29) vers le bout (32) de la chaussure (24), et une surface (40) inférieure d'une forme de bascule prédéterminée ;
    une couche intermédiaire pour se fixer par-dessus la surface (40) inférieure de la pièce de bascule (14, 58) ; et
    une couche de matière de semelle d'usure (16) configurée pour se fixer par-dessus la surface inférieure de la couche intermédiaire et toute portion exposée de la surface plantaire d'une chaussure (24) à laquelle le kit (10) est fixé ; caractérisé en ce que,
    la couche intermédiaire comprend un ou plusieurs espaces fermés contenant un fluide pseudoplastique.
     
    2. Kit (10, 100) selon la revendication 1, comprenant en outre un dessus de chaussure (12) ayant une semelle (28) avec une surface plantaire qui a une portion de surface plate s'étendant le long d'au moins une partie de la longueur de la semelle (26, 28) depuis le talon (29) vers le bout (32) du dessus de chaussure, la surface supérieure (59) de la pièce de bascule (14, 58) étant également plate.
     
    3. Kit (10, 100) selon la revendication 1, dans lequel la pièce de bascule (14, 58), la couche intermédiaire, et la couche de matière de semelle d'usure (16) sont configurées pour se fixer à la surface plantaire inférieure d'une semelle d'un dessus de chaussure gauche et comprenant en outre une pièce de bascule (14, 58), une seconde couche intermédiaire et une seconde couche de matière de semelle d'usure configurées pour se fixer à la surface plantaire inférieure d'une semelle d'un dessus de chaussure droit.
     
    4. Kit (10, 100) selon la revendication 3, comprenant en outre le dessus de chaussure gauche et le dessus de chaussure droit, dans lequel la surface plantaire inférieure de chacune des semelles (26, 28) des dessus de chaussure gauche et droit a une portion de surface plate s'étendant le long d'au moins une partie de la longueur de la semelle (26, 28) depuis le talon (29) vers le bout (32) des dessus de chaussure gauche et droit respectifs, les surfaces supérieures de la première pièce de bascule et seconde pièce de bascule respectives étant également plates.
     
    5. Kit (10, 100) selon la revendication 2, dans lequel au moins un côté de la semelle du dessus de chaussure a un premier indicateur (34, 46) au moins approximativement aligné sur une articulation de cheville d'un porteur de la chaussure (24), et un côté correspondant de la pièce de bascule a un second indicateur (34, 46) correspondant pour un alignement sur le premier indicateur (34, 46) lorsque la pièce de bascule (14, 58) est fixée à la semelle.
     
    6. Kit (10, 100) selon la revendication 1, dans lequel la surface (40) inférieure de la pièce de bascule est courbée et les couches intermédiaire et de semelle d'usure sont configurées pour se conformer à la courbure de la surface (40) inférieure courbée lorsque la pièce de bascule (14, 58) et les couches intermédiaire et de semelle d'usure sont assemblées.
     
    7. Kit (10, 100) selon la revendication 6, dans lequel la courbure de la surface (40) inférieure de la pièce de bascule est sélectionnée pour former un rayon de bascule dans la plage partant de 10 % à 25 % de la taille d'un porteur, ou dans lequel la surface (40) inférieure de la pièce de bascule a au moins une entaille s'étendant dans la largeur de la surface (40), et au moins un ajout déformable configuré pour se fixer dans l'entaille et contenant un fluide pseudoplastique ou une matière hautement amortie qui se déforme sous une charge statique, l'ajout ayant une surface inférieure courbée dans une condition non déformée pendant la marche et une surface inférieure aplatie lorsqu'elle est déformée sous une charge statique lorsqu'un porteur se tient debout, moyennant quoi une zone de la surface de semelle d'usure (16) sous-jacente est aplatie.
     
    8. Kit (10, 100) selon la revendication 1, dans lequel le fluide pseudoplastique a une viscosité maximale à laquelle il est au moins sensiblement non compressible dans des conditions statiques, moyennant quoi la couche intermédiaire a une portion de surface inférieure plate s'étendant depuis le talon (29) et se terminant un peu avant le bout (32) de la chaussure dans des conditions statiques, et est progressivement compressée lorsqu'un porteur de la chaussure marche.
     
    9. Kit (10, 100) selon la revendication 1, dans lequel la couche intermédiaire comprend une couche d'amortissement (15), et dans lequel la surface (40) inférieure de la pièce de bascule (14, 58) rencontre la surface supérieure (38) au niveau d'un point de rupture (36) avant, et la surface supérieure de la couche d'amortissement (15) est d'une forme coïncidant avec la surface (40) inférieure de la pièce de bascule (14, 58) jusqu'au point de rupture (36) avant, et a une face d'extrémité supérieure plate configurée pour adhérer à la surface plantaire inférieure de la semelle (28) de la chaussure devant le point de rupture (36) de la pièce de bascule (14, 58).
     
    10. Kit (10, 100) selon la revendication 9, dans lequel la couche intermédiaire comprend une couche d'amortissement (15), et dans lequel la surface (40) inférieure de la pièce de bascule (14, 58) et la surface supérieure de la couche d'amortissement (15) sont une parmi une forme coïncidant, courbée, jusqu'à la face d'extrémité supérieure plate, ou une forme coïncidant, angulaire, jusqu'à la face d'extrémité supérieure plate, la forme angulaire comprenant une portion de surface plate s'étendant depuis une extrémité de talon vers une extrémité avant, et une portion resserrée vers le haut s'étendant depuis la portion de surface plate jusqu'au point de rupture (36) avant et une face d'extrémité supérieure plate de la pièce de bascule (14, 58) et la couche d'amortissement (15), respectivement.
     
    11. Kit (10, 100) selon la revendication 1, comprenant en outre un dernier gabarit double (18) pour maintenir une paire de chaussures (24) tandis que les semelles (26) sont découpées pour former des portions de surface plate pour se fixer à une surface supérieure (38) d'une pièce de bascule (14, 58).
     
    12. Chaussure à bascule (52, 55) construite en utilisant le kit (10, 100) selon l'une quelconque des revendications 1 à 11, comprenant :

    un dessus de chaussure (12) ayant un talon (29), un bout (32), et une semelle (26) ;

    une portion de bascule avec une surface (40) de bascule inférieure s'étendant par-dessus au moins une portion principale de la semelle ;

    la portion de bascule comprenant une pièce de bascule (14, 58) d'une matière rigide ou semi-rigide ayant une surface supérieure (38) fixée à la surface plantaire inférieure de la chaussure et une surface (40) inférieure, une couche intermédiaire fixée par-dessus la surface (40) inférieure de la pièce de bascule, et une couche de matière de semelle d'usure (16) fixée par-dessus la surface inférieure de la couche intermédiaire et par-dessus toute portion exposée de la surface plantaire de la chaussure (24) ; caractérisée en ce que,

    la couche intermédiaire comprend un ou plusieurs espaces fermés contenant un fluide pseudoplastique.


     
    13. Chaussure à bascule (52, 55) selon la revendication 12, comprenant en outre un ou plusieurs ajouts de matière compressible montés dans une ou plusieurs découpes dans la surface (40) inférieure de la pièce de bascule (14, 58), la couche intermédiaire s'étendant par-dessus la surface (40) inférieure de la portion de bascule et les ajouts.
     
    14. Procédé de construction d'une chaussure à bascule (52, 55) selon l'une quelconque des revendications 1 à 13, comprenant :

    l'attache d'une surface supérieure (38) d'une pièce de bascule (14, 58) d'une matière rigide ou semi-rigide, non déformable, à la surface inférieure de la semelle (26) d'un dessus de chaussure avec une extrémité arrière de la pièce de bascule (14, 58) au niveau du talon (29) du dessus de chaussure et l'extrémité avant espacée du bout (29) du dessus de chaussure ;

    l'attache d'une couche intermédiaire d'une matière différente de la pièce de bascule (14, 58) par-dessus une surface (40) inférieure de la pièce de bascule, dans lequel la couche intermédiaire comprend un ou plusieurs espaces fermés contenant un fluide pseudoplastique ; et

    l'attache d'une couche de matière de semelle d'usure (16) par-dessus une surface inférieure de la couche intermédiaire et toute portion exposée de la semelle (26) de la chaussure devant la pièce de bascule (14, 58) et une couche intermédiaire.


     




    Drawing




































    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description




    Non-patent literature cited in the description