BACKGROUND
[0001] Conventional articles of footwear generally include two primary elements: an upper
and a sole structure. The upper is secured to the sole structure and forms a void
within the footwear for comfortably and securely receiving a foot. The sole structure
is secured to a lower surface of the upper so as to be positioned between the upper
and the ground. In some articles of athletic footwear, for example, the sole structure
may include a midsole and an outsole. The midsole may be formed from a polymer foam
material that attenuates ground reaction forces to lessen stresses upon the foot and
leg during walking, running, and other ambulatory activities. The outsole is secured
to a lower surface of the midsole and forms a ground-engaging portion of the sole
structure that is formed from a durable and wear-resistant material. The sole structure
may also include a sockliner positioned within the void and proximal a lower surface
of the foot to enhance footwear comfort.
[0002] The upper generally extends over the instep and toe areas of the foot, along the
medial and lateral sides of the foot, and around the heel area of the foot. In some
articles of footwear, such as basketball footwear and boots, the upper may extend
upward and around the ankle to provide support or protection for the ankle. Access
to the void on the interior of the upper is generally provided by an ankle opening
in a heel region of the footwear. A lacing system is often incorporated into the upper
to adjust the fit of the upper, thereby permitting entry and removal of the foot from
the void within the upper. The lacing system also permits the wearer to modify certain
dimensions of the upper, particularly girth, to accommodate feet with varying dimensions.
In addition, the upper may include a tongue that extends under the lacing system to
enhance adjustability of the footwear, and the upper may incorporate a heel counter
to limit movement of the heel.
[0003] Various materials are conventionally utilized in manufacturing the upper. The upper
of athletic footwear, for example, may be formed from multiple material elements.
The materials may be selected based upon various properties, including stretch-resistance,
wear-resistance, flexibility, air-permeability, compressibility, and moisture-wicking,
for example. With regard to an exterior of the upper, the toe area and the heel area
may be formed of leather, synthetic leather, or a rubber material to impart a relatively
high degree of wear-resistance. Leather, synthetic leather, and rubber materials may
not exhibit the desired degree of flexibility and air-permeability for various other
areas of the exterior. Accordingly, the other areas of the exterior may be formed
from a synthetic textile, for example. The exterior of the upper may be formed, therefore,
from numerous material elements that each imparts different properties to the upper.
An intermediate or central layer of the upper may be formed from a lightweight polymer
foam material that provides cushioning and enhances comfort. Similarly, an interior
of the upper may be formed of a comfortable and moisture-wicking textile that removes
perspiration from the area immediately surrounding the foot. The various material
elements and other components may be joined with an adhesive or stitching. Accordingly,
the conventional upper is formed from various material elements that each imparts
different properties to various areas of the footwear.
[0004] US 2950611 A discloses a knitted hosiery and a novel hoisery construction and a method of closing
the foot of a hose knitted on a circular knitting machine.
[0005] US 2147197 A discloses articles of footwear and methods of making the same and is further related
to the manufacture of shoes having textile uppers.
SUMMARY
[0006] An article of footwear is disclosed that includes a sole structure and an upper coupled
to the sole structure. The upper includes a lower edge that is disposed adjacent to
the sole structure. The upper further includes a collar defining an opening to a void
within the upper. The collar defines an upper edge of the upper that is spaced away
from the lower edge. The upper includes a forward portion and a heel portion. The
heel portion includes a knitted component of unitary knit construction. The knitted
component at least partially defines the upper edge and the lower edge of the upper.
The knitted component includes a first side edge that is attached to the forward portion
along a first side. The knitted component also includes a second side edge that is
attached to the forward portion along a second side.
[0007] Also, an article of footwear is disclosed that includes a sole structure and an upper
coupled to the sole structure. The upper includes a forward portion formed of a first
component and a heel portion formed of a second component, the first component being
separate from the second component. The forward portion and the heel portion being
joined to each other along at least one seam. The heel portion includes a heel knitted
component of unitary knit construction. The heel knitted component has a first knitted
zone associated with a first amount of stretch resistance and a second knitted zone
associated with a second amount of stretch resistance. The first amount of stretch
resistance of the first knitted zone is larger than the second amount of stretch resistance
of the second knitted zone.
[0008] Moreover, an article of footwear is disclosed that includes a sole structure and
an upper coupled to the sole structure. The upper includes a lower edge that is disposed
adjacent the sole structure. The upper includes a collar defining an opening to a
void within the upper. The collar defines an upper edge of the upper that is spaced
away from the lower edge. The upper also includes a forward portion including a forward
knitted component of unitary knit construction. Additionally, the upper includes a
heel portion including a heel knitted component of unitary knit construction. The
heel portion has a first knitted zone, a second knitted zone, and a third knitted
zone. The first knitted zone is associated with a first amount of stretch resistance,
the second knitted zone is associated with a second amount of stretch resistance,
and the third knitted zone is associated with a third amount of stretch resistance.
The first amount of stretch resistance is larger than the second amount of stretch
resistance, and the second amount of stretch resistance is larger than the third amount
of stretch resistance. The third knitted zone partially defines the collar and the
upper edge. The first knitted zone partially defines the lower edge. The second knitted
zone is cooperatively surrounded by the first knitted zone and the third knitted zone.
The heel knitted component includes a first edge that is joined via stitching to the
forward knitted component on a medial side of the upper. The heel knitted component
further includes a second edge that is joined via stitching to the forward knitted
component on a lateral side of the upper.
[0009] Other systems, methods, features and advantages of the present disclosure will be,
or will become, apparent to one of ordinary skill in the art upon examination of the
following figures and detailed description. It is intended that all such additional
systems, methods, features and advantages be included within this description and
this summary, be within the scope of the present disclosure, and be protected by the
following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The present disclosure can be better understood with reference to the following drawings
and description. The components in the figures are not necessarily to scale, emphasis
instead being placed upon illustrating the principles of the present disclosure. Moreover,
in the figures, like reference numerals designate corresponding parts throughout the
different views.
FIG. 1 is a lateral side view of an article of footwear according to exemplary embodiments
of the present disclosure;
FIG. 2 is a medial side view of the article of footwear of FIG. 1;
FIG. 3 is a top view of the article of footwear of FIG. 1;
FIG. 4 is a bottom view of an upper of the article of footwear of FIG. 1;
FIG. 5 is a rear view of the upper of the article of footwear of FIG. 1;
FIG. 6 is a plan view of knitted components of the upper of the article of footwear
of FIG. 1;
FIG. 7 is a plan view of an exterior surface of a heel knitted component of the upper
of the article of footwear of FIG. 1;
FIG. 8 is a plan view of an interior surface of a heel knitted component of the upper
of the article of footwear of FIG. 1;
FIG. 9 is a plan view of a heel knitted component according to additional embodiments
of the present disclosure;
FIG. 10 is a plan view of a heel knitted component according to additional embodiments
of the present disclosure;
FIGS. 11A and 11B are cross-sectional views of the heel knitted component illustrated
in FIG. 10, as respectively defined along section lines 11A-11A and 11B-11B in FIG.
10;
FIG. 12 is a plan view of a heel knitted component according to additional embodiments
of the present disclosure;
FIG. 13 is a cross-sectional view of the heel knitted component illustrated in FIG.
12, as defined along section line 13-13 in FIG. 12;
FIGS. 14A-14C are plan views of further heel knitted components according to additional
embodiments of the present disclosure;
FIG. 15 is an exploded rear elevational view of the article of footwear incorporating
the heel knitted component depicted in FIGS. 12 and 13;
FIG. 16 is a cross sectional view of the article of footwear, as defined along section
line 15-15 in FIG. 14.
FIG. 17 is a perspective view of a knitting machine;
FIGS. 18A-18D are schematic elevational views of a portion of the knitting machine
and depicting a knitting process for forming the heel knitted component depicted in
FIGS. 10 and 11;
FIG. 19 is a schematic elevational view depicting a portion of a knitting process
for forming the heel knitted component depicted in FIGS. 12 and 13; and
FIG. 20 is a plan view of a knitted component according to additional embodiments
of the present disclosure.
DETAILED DESCRIPTION
[0011] The following discussion and accompanying figures disclose an article of footwear
having an upper that includes at least one knitted component. The article of footwear
is disclosed as having a general configuration suitable for walking or running. Concepts
associated with the footwear, including the upper, may also be applied to a variety
of other athletic footwear types, including baseball shoes, basketball shoes, cross-training
shoes, cycling shoes, football shoes, soccer shoes, sprinting shoes, tennis shoes,
and hiking boots, for example. The concepts may also be applied to footwear types
that are generally considered to be non-athletic, including dress shoes, loafers,
sandals, and work boots. The concepts disclosed herein apply, therefore, to a wide
variety of footwear types.
Footwear Configurations
[0012] FIGS. 1 through 3 illustrate exemplary embodiments of an article of footwear 100,
also referred to simply as footwear 100. In some embodiments, article of footwear
100 may generally include a sole structure 110 and an upper 120.
[0013] For reference purposes, footwear 100 may be divided generally along a longitudinal
axis X into three general regions: a forefoot region 101, a midfoot region 102, and
a heel region 103. Forefoot region 101 generally includes portions of footwear 100
corresponding with the toes and the joints connecting the metatarsals with the phalanges.
Midfoot region 102 generally includes portions of footwear 100 corresponding with
an arch area of the foot. Heel region 103 generally corresponds with rear portions
of the foot, including the calcaneus bone. Footwear 100 also includes a lateral side
104 and a medial side 105, which extend through each of forefoot region 101, midfoot
region 102, and heel region 103 and correspond with opposite sides of footwear 100.
More particularly, lateral side 104 corresponds with an outside area of the foot (i.e.,
the surface that faces away from the other foot), and medial side 105 corresponds
with an inside area of the foot (i.e., the surface that faces toward the other foot).
Forefoot region 101, midfoot region 102, and heel region 103 and lateral side 104,
medial side 105 are not intended to demarcate precise areas of footwear 100. Rather,
forefoot region 101, midfoot region 102, and heel region 103 and lateral side 104,
medial side 105 are intended to represent general areas of footwear 100 to aid in
the following discussion. In addition to footwear 100, forefoot region 101, midfoot
region 102, and heel region 103 and lateral side 104, medial side 105 can also independently
refer to sole structure 110, upper 120, and individual elements thereof.
[0014] Sole structure 110 can be secured to upper 120 and can extend between the foot and
the ground when footwear 100 is worn. In some embodiments, the sole structure 110
can generally include a midsole 111 and an outsole 112.
[0015] Midsole 111 can be secured to a lower surface of upper 120 and may be formed from
a compressible polymer foam element (e.g., a polyurethane or ethylvinylacetate foam)
that attenuates ground reaction forces (i.e., provides cushioning) when compressed
between the foot and the ground during walking, running, or other ambulatory activities.
In additional embodiments, midsole 111 may incorporate plates, moderators, fluid-filled
chambers, lasting elements, or motion control members that further attenuate forces,
enhance stability, or influence the motions of the foot. Midsole 111 can also be primarily
formed from a fluid-filled chamber.
[0016] Outsole 112 can be secured to a lower surface of midsole 111. Outsole 112 can also
be formed from a wear-resistant rubber material that is textured to impart traction.
[0017] The sole structure 110 can further include a sockliner 113 in some embodiments. Sockliner
113 is shown partially in FIG. 3. Sockliner 113 can be located within upper 120 and
can be positioned to extend under a lower surface of the foot to enhance the comfort
of footwear 100.
[0018] Although this configuration for sole structure 110 provides an example of a sole
structure 110 that may be used in connection with upper 120, a variety of other conventional
or nonconventional configurations for sole structure 110 may also be used. Accordingly,
in other embodiments, the features of sole structure 110 or any sole structure used
with upper 120 may vary.
[0019] Upper 120 will now be discussed generally. Upper 120 can define a void 117 within
footwear 100 for receiving and securing a foot relative to sole structure 110. Void
117 is shaped to accommodate the foot and extends along a lateral side of the foot,
along a medial side of the foot, over the foot and toes, around the heel, and under
the foot.
[0020] Upper 120 can define a collar 130 with an upper edge 132 that defines an opening
121. Opening 121 can provide access to void 117 for the wearer's foot and can be located,
at least, in heel region 103.
[0021] A tongue 140 can be included forward of collar 130 and can extend longitudinally
toward forefoot region 101 and between lateral side 104 and medial side 105. As shown
in the illustrated embodiments, tongue 140 can be integrally attached to forefoot
region 101, lateral side 104, and medial side 105. In other embodiments, tongue 140
can be detached from lateral side 104 and medial side 105. As such, tongue 140 can
be moveably received within an open throat area of upper 120 between lateral side
104 and medial side 105.
[0022] In some embodiments, closure element 122 can also be included that is used to selectively
secure upper 120 to the wearer's foot. Closure element 122 can be of any suitable
type, such as a lace as shown in the illustrated embodiments. In other embodiments,
closure element 122 may also include one or more buckles, straps, or other suitable
implements for securing upper 120 to a wearer's foot.
[0023] In an exemplary embodiment, closure element 122 may be configured to interact with
tensile strands 141 to assist with securing upper 120 to a wearer's foot. In the illustrated
embodiment, upper 120 includes a plurality of tensile strands 141 that extend upward
along upper 120 from sole structure 110 and extend back down forming looped ends to
provide apertures 143 that receive closure element 122. Tensile strands 141 suitable
for use with upper 120 may include the tensile strands and/or tensile elements disclosed
in one or more of commonly-owned
U.S. Patent Application Serial Number 12/338,726 to Dua et al., entitled "Article of Footwear Having An Upper Incorporating A Knitted Component",
filed on December 18, 2008 and published as
U.S. Patent Application Publication Number 2010/0154256 on June 24, 2010, and
U.S. Patent Application Serial Number 13/048,514 to Huffa et al., entitled "Article Of Footwear Incorporating A Knitted Component", filed on March
15, 2011 and published as
U.S. Patent Application Publication Number 2012/0233882 on September 20, 2012.
[0024] In this embodiment, apertures 143 provided by strands 141 are spaced apart along
axis X and between lateral side 104 and medial side 105. Accordingly, closure element
122 extends along axis X and alternates between lateral side 104 and medial side 105.
By tensioning closure element 122, the wearer can modify dimensions of upper 120 to
accommodate proportions of the foot. More particularly, closure element 122 can permit
the wearer to tighten upper 120 around the foot, and closure element 122 can permit
the wearer to loosen upper 120 to facilitate entry and removal of the foot from void
117 through opening 121.
[0025] In some configurations, upper 120 can also extend at least partially under the wearer's
foot. For example, sole structure 110 is removed in FIG. 4, and as shown upper 120
can include a strobel 125 that is attached along a periphery to a lower edge 160.
Strobel 125 can be attached via stitching 162 as shown in the illustrated embodiments,
via fasteners, via adhesives, or via another attachment device. Accordingly, strobel
125 extends under the wearer's foot. As mentioned above, sole structure 110 can include
a sockliner 113 and midsole 111. In these embodiments, sockliner 113 can be layered
over an upper surface of strobel 125 within void 117, and midsole 111 can be joined
to a lower surface of strobel 125.
[0026] In further configurations, upper 120 may include additional elements. For example,
upper 120 can include a toe guard in forefoot region 101 that is formed of a wear-resistant
material. Upper 120 can additionally include logos, trademarks, symbols, and placards
with care instructions and material information. Those having ordinary skill in the
art will appreciate that upper 120 can include still further elements without departing
from the scope of the present disclosure.
[0027] Many conventional footwear uppers are formed from multiple material elements (e.g.,
polymer foam, polymer sheets, leather, synthetic leather) that are joined together
through stitching or bonding, for example. However, in various embodiments discussed
herein, upper 120 can be at least partially formed from a knitted component 130. Knitted
component 130 can at least partially extend through forefoot region 101, midfoot region
102, and/or heel region 103. Knitted component 130 can also extend along lateral side
104, medial side 105, over forefoot region 101, and/or around heel region 103. In
addition, knitted component 130 can at least partially define an exterior surface
119 and an opposite interior surface 115 of upper 120. Interior surface 115 can define
at least a portion of void 117 within upper 120, and exterior surface 119 can face
in an opposite direction from the interior surface 115.
[0028] As will be discussed, knitted component 130 can provide the upper 120 with weight
savings as compared with other conventional uppers. Additionally, in some embodiments,
knitted component 130 can be configured with different zones having different characteristics.
For example, one or more predetermined zones can have more stretch resistance than
other zones. Also, knitted component 130 can provide the upper 120 with aesthetically
pleasing features and textures. Still further, knitted component 130 can provide advantages
in the manufacture of footwear 100. Other advantages due to the knitted component
130 will be explored in detail below.
Knitted Component Configurations
[0029] In some embodiments, knitted component 130 can include a plurality of knitted subcomponents
that are independently formed to each have unitary knit construction. Once formed,
these knitted components of unitary knit construction can be joined together to define
at least a portion of upper 120.
[0030] For example, as shown in the illustrated embodiments, knitted component 130 can include
a first knitted component or forward knitted component 150 and a second knitted component
or heel knitted component 152 that are joined together to cooperatively define knitted
component 130. In one embodiment, forward knitted component 150, heel knitted component
152, and strobel 125 can be joined together to cooperatively define upper 120 as shown
in FIG. 4.
[0031] For purposes of clarity, forward knitted component 150 and heel knitted component
152 are shown separated and laid substantially flat in FIG. 6 according to exemplary
embodiments. As shown, forward knitted component 150 is formed of unitary knit construction,
and heel knitted component 152 is also formed of unitary knit construction.
[0032] As used herein, the term "unitary knit construction" means that the respective component
is formed as a one-piece element through a knitting process. That is, the knitting
process substantially forms the various features and structures of unitary knit construction
without the need for significant additional manufacturing steps or processes. A unitary
knit construction may be used to form a knitted component having structures or elements
that include one or more courses of yarn or other knit material that are joined such
that the structures or elements include at least one course in common (i.e., sharing
a common yarn) and/or include courses that are substantially continuous between each
of the structures or elements. With this arrangement, a one-piece element of unitary
knit construction is provided.
[0033] As shown in FIG. 6, forward knitted component 150 can include a medial portion 202,
a lateral portion 204, and a forward portion 200. Boundaries of forward knitted component
150 can be defined by a first U-shaped peripheral edge 208, a smaller second U-shaped
peripheral edge 209, a first rear edge 210 that extends transversely between edge
208 and edge 209, and a second rear edge 212 that extends transversely between edge
208 and edge 209.
[0034] Additionally, heel knitted component 152 can include an upper peripheral edge 220,
a lower peripheral edge 222, a first side edge 224 that extends transversely between
upper peripheral edge 220 and lower peripheral edge 222, and a second side edge 226
that extends transversely between upper peripheral edge 220 and lower peripheral edge
222. In some embodiments, edges 224, 226 may be at least partially angled away from
each other as edges 224, 226 extend from upper peripheral edge 220 to lower peripheral
edge 222.
[0035] Forward knitted component 150 can be coupled to heel knitted component 152 to define
upper 120 as shown in FIGS. 1-4. For example, first rear edge 210 of forward knitted
component 150 can be coupled to first side edge 224 of heel knitted component 152
to define a first seam 240 of upper 120. Also, second rear edge 212 of forward knitted
component 150 can be coupled to second side edge 226 of heel knitted component 152
to define a second seam 242 of upper 120.
[0036] Forward knitted component 150 can be coupled to heel knitted component 152 along
seam 240 and seam 242 in any suitable fashion. For example, knitted components 150,
152 can be coupled at seam 240 and seam 242 via stitching, via adhesives, via fasteners,
or via any other suitable attachment mechanism.
[0037] When assembled into upper 120, medial portion 202 of forward knitted component 150
can define a majority of medial side 105 of upper 120. Also, forward portion 200 can
define a majority of forefoot region 101 of upper 120. Additionally, lateral portion
204 can define a majority of lateral side 104 of upper 120. Heel knitted component
152 can define a majority of heel region 103 of upper 120. Also, second peripheral
edge 209 and upper peripheral edge 220 can cooperate to define upper edge 132 of upper
120 as shown in FIGS. 1-3. Furthermore, first peripheral edge 208 and lower peripheral
edge 222 can cooperate to define lower edge 160 of upper 120 as shown in FIG. 4. Moreover,
first seam 240 can extend from upper edge 132 to lower edge 160 on medial side 105
of upper 120 as shown in FIGS. 2, 3, and 4. Additionally, second seam 242 can extend
from upper edge 132 to lower edge 160 on lateral side 105 of upper 120 as shown in
FIGS. 1, 3, and 4.
[0038] In some embodiments, forward knitted component 150 may include a plurality of zones
that have one or more different physical properties. Boundaries of these zones are
indicated by broken lines in the illustrated embodiments. For example, as most clearly
illustrated in FIGS. 3 and 6, forward knitted component 150 can include a first zone
214, a second zone 216, and a third zone 218. As shown in the illustrated embodiments,
third zone 218 can be U-shaped and substantially centered between medial portion 202
and lateral portion 204, adjacent second peripheral edge 209. Accordingly, an internal
boundary 163 of third zone 218 can be located approximately a uniform distance spaced
apart from second peripheral edge 209 so as to be substantially concentric with second
peripheral edge 209 as shown in the plan view of FIG. 6. Also, second zone 216 can
extend forward longitudinally from third zone 218 toward forward portion 200, and
second zone 216 can include a medial branch 219 that extends between forward portion
200 and medial portion 202. A first portion 221 of first zone 214 extends between
third zone 218, first rear edge 210, peripheral edge 208, and second zone 216. A second
portion 223 of first zone 214 extends between third zone 218, second rear edge 212,
peripheral edge 208, and second zone 216.
[0039] First zone 214, second zone 216, and third zone 218 can have one or more different
physical properties. For example, first zone 214 can have a larger degree or a larger
amount of stretch resistance than second zone 216, and second zone 216 can have a
larger degree or larger amount of stretch resistance than third zone 218. Stated differently,
first zone 214 can be stiffer than second zone 216, and second zone 216 can be stiffer
than third zone 218. Thus, third zone 218 can stretch readily to allow passage of
the wearer's foot through collar 123 of upper 120, whereas first zone 214 can be more
stretch resistant such that first zone 214 provides support for the wearer's foot.
Moreover, second zone 216 can be stretchable enough to allow upper 120 to comfortably
conform to the wearer's foot.
[0040] Likewise, in some embodiments, heel knitted component 152 can include a plurality
of zones that have one or more different physical properties. Boundaries of these
zones are indicated by broken lines in the illustrated embodiments. For example, as
most clearly illustrated in FIG. 6, heel knitted component 152 can include a first
zone 228, a second zone 230, and a third zone 232.
[0041] In an exemplary embodiment, one or more of the different zones 228, 230, 232 may
be associated with different portions of heel knitted component 152. By providing
different portions of heel knitted component 152 with zones of varying physical properties,
the fit, comfort, and/or support provided by heel knitted component to upper 120 may
be varied as desired.
[0042] In one embodiment, third zone 232 may be provided along a peripheral edge of knitted
component 152 that is associated with collar 132 and adjacent to opening 121 of upper
120. An internal boundary 161 of third zone 232 is shown in FIG. 6 in broken lines
and partially demarcates third zone 232 from first zone 228 and partially demarcates
third zone 232 from second zone 230. As shown in FIG. 6, third zone 232 can have a
substantially constant width and can extend along upper peripheral edge 220. Thus,
internal boundary 161 of third zone 232 can be located approximately a uniform distance
spaced apart from upper peripheral edge 220 so as to be substantially concentric with
upper peripheral edge 220 as shown in the plan view of FIG. 6.
[0043] In an exemplary embodiment, second zone 230 may be provided in a location along a
portion of knitted component 152 that corresponds to a heel and/or Achilles tendon
of a foot of a wearer. In this embodiment, second zone 230 may be located approximately
in the middle of knitted component 152 along the transverse direction. By providing
second zone 230 with a configuration that imparts various physical properties, the
portion of knitted component 152 that corresponds to the heel and/or Achilles tendon
of a foot of a wearer may have a desired fit, comfort, and/or support.
[0044] In different embodiments, second zone 230 may have any suitable shape. In one embodiment,
second zone 230 may have a substantially symmetric geometric shape. For example, in
this embodiment, second zone 230 can be polygonal. As shown in FIG. 6, second zone
230 can include an inverted triangular portion 231 and a diamond portion 233 that
are arranged end-to-end and that extend from third zone 232 toward lower peripheral
edge 222. Second zone 230 can also be substantially symmetrical and centered with
respect to axis X of upper 120. Moreover, first zone 228 can extend between third
zone 232, first side edge 224, lower peripheral edge 222, second side edge 226, and
second zone 230.
[0045] First zone 228, second zone 230, and third zone 232 can have one or more different
physical properties. For example, first zone 228 can have a larger degree or larger
amount of stretch resistance than second zone 230, and second zone 230 can have a
larger degree or larger amount of stretch resistance than third zone 232. Stated differently,
first zone 228 can be stiffer than second zone 230, and second zone 230 can be stiffer
than third zone 232.
[0046] In some embodiments, first zone 228 of heel knitted component 152 can have similar
physical properties as first zone 214 of forward knitted component 150. Also, second
zone 230 of heel knitted component 152 can have similar physical properties as second
zone 216 of forward knitted component 150. Moreover, third zone 232 of heel knitted
component 152 can have similar physical properties as third zone 218 of forward knitted
component 150. Thus, for example, first zones 228, 214 can have substantially the
same stretch resistance or stiffness, second zones 230, 216 can have substantially
the same stretch resistance or stiffness, and third zones 232, 218 can have substantially
the same stretch resistance or stiffness.
[0047] The varying stretch resistance of each zone 214, 216, 218, 228, 230, 232 can be achieved
in various ways. For example, in some cases, each zone 214, 216, 218, 228, 230, 232
can have a different stitching pattern. Additionally, each zone 214, 216, 218, 228,
230, 232 may include different types of yarns or strands. More specifically, in one
embodiment, third zones 218, 232 can be formed using a half-gauge knit to provide
a ribbed appearance, and third zones 218, 232 can be formed at least partially using
one or more elastic yarns, such as spandex. Second zones 216, 230 can be formed using
a full-gauge knit and can be formed using one or more elastic yarns, such as spandex.
In additional embodiments, second zones 216, 230 can have a mesh-type of appearance
for increased breathability. Furthermore, first zones 214, 228 can be formed using
a full-gauge knit and can include yarns made from thermoplastic polymeric material.
These yarns can be less elastic than yarns included in second and third zones 216,
230, 218, 232, and these yarns can partially melt and fuse to impart additional stiffness
to the respective zones 214, 228 after heat is applied to upper 120. It will be appreciated
that these thermoplastic yarns can be absent from second and third zones 216, 230,
218, 232. It will also be appreciated that the yarns of each zone 214, 216, 218, 228,
230, 232 can be incorporated and controlled through known intarsia knitting processes.
Moreover, the zones 214, 216, 218, 228, 230, 232 can be formed and incorporated according
to the teachings in commonly-owned
U.S. Patent Application Serial No. 13/691,316 to Podhajny, et al., entitled "Article of Footwear Incorporating a Knitted Component," filed November
30, 2012.
[0048] It will be appreciated that the knitted component 130 of upper 120 can provide weight
savings for the article of footwear 100. Also, the knitted component 130 can provide
different physical characteristics at different zones 214, 216, 218, 228, 230, 232
such that upper 120 can be comfortable, can provide localized support to the wearer's
foot, and can be easy to put on and remove. Moreover, the knitting processes used
to produce knitted component 130 can reduce waste, can reduce manufacturing time,
and/or can provide other manufacturing advantages.
[0049] Also, as discussed above, knitted component 130 can be formed from a plurality of
subcomponents, namely, forward knitted component 150 and heel knitted component 152.
As such, properties of knitted component 130 can be highly controlled during manufacture.
For example, it will be appreciated that the heel region 103 of upper 120 can be important
for providing support to the wearer's heel without sliding or rubbing uncomfortably
on the wearer's skin. Thus, heel knitted component 152 can include relatively stiff
first zone 228 for providing suitable support. Heel knitted component 152 can also
include the more elastic second zone 230, which can be substantially centered on heel
knitted component 152, such that the second zone 230 can stretch and conform comfortably
against the wearer's heel. The second zone 230 can also stretch and conform as the
wearer's heel flexes during walking, running, and otherwise moves. Thus, the heel
knitted component 152 can provide an important balance of stiff support and flexure
such that a separate heel counter may not be necessary in the article of footwear
100.
[0050] Moreover, because the forward knitted component 150 and heel knitted component 152
are separate and independent and are each of unitary knit construction, portions of
upper 120 can be tailored and tuned for particular uses, for particular wearers, or
for other purposes. For example, if the heel region 103 of upper 120 is to have a
different desired physical property, for example to be made stiffer, then forward
knitted component 150 could be joined to a different heel knitted component provided
with a smaller second zone than second zone 230. Alternatively, if heel region 103
is to be made more flexible, then forward knitted component 150 could be joined to
another different heel knitted component provided with a larger second zone than second
zone 230.
[0051] Manufacturing of knitted components 150, 152 and upper 120 will now be discussed.
As mentioned, knitted components 150, 152 can be formed to have one-piece unitary
knit construction. For example, knitted components 150, 152 can be knit on flat knitting
machines. Also, in some embodiments, heel knitted component 152 can be knit such that
upper peripheral edge 220 is formed first, and additional courses can be added until
lower peripheral edge 222 is formed. As such, upper peripheral edge 220 can have a
neat and finished appearance, and raw lower peripheral edge 222 can be eventually
covered and bound by sole structure 110. Likewise, forward knitted component 150 can
be formed such that second peripheral edge 209 is formed first, and courses can be
added until first peripheral edge 208 is formed.
[0052] Then, knitted components 150, 152 can be joined at seams 240, 242 as discussed above.
To facilitate this assembly process, heel knitted component 152 can include an indicia
254, such as an "X" shown in FIG. 8, which differentiates between an interior surface
250 of heel knitted component 152 and an exterior surface 252 of heel knitted component
152. It is noted that exterior surface 252 of heel knitted component 152, shown in
FIG. 7, does not include indicia 254. Thus, even if heel knitted component 152 is
substantially symmetric, the manufacturer can differentiate between interior and exterior
surfaces 250, 252 to assist with orienting heel knitted component 152 for attachment
to forward knitted component 150.
[0053] It is also noted that interior surface 250 can partially define void 117 of upper
120, and exterior surface 252 can face outwardly. Thus, indicia 254 as shown in FIG.
8 can be less visible to the wearer or others when upper 120 is fully assembled. However,
it will be appreciated that exterior surface 252 can include indicia 254 instead of
interior surface 250. Also, indicia 254 can be formed by yarns or strands included
in the unitary knit construction of heel knitted component 152, or indicia 254 can
be marked separately from unitary knit construction of heel knitted component 152.
Moreover, indicia 254 can be located in any suitable location of heel knitted component
152. For example, as shown in FIG. 8, indicia 254 can be substantially centered on
heel knitted component 15 and may be adjacent to lower peripheral edge 222.
[0054] Once knitted components 150, 152 are joined at seams 240, 242, strobel 125 can be
attached to lower edge 160 as shown in FIG. 4. Then, sole assembly 110 can be attached
as discussed above.
[0055] Referring now to FIG. 9, an alternate embodiment of a heel knitted component 352
is illustrated according to additional teachings of the present disclosure. Heel knitted
component 352 can be substantially similar to the embodiments discussed above. For
example, heel knitted component 352 can include a first zone 328, a second zone 330,
and a third zone 332 similar to the embodiments discussed above. However, heel knitted
component 352 can define an internal boundary 361 demarcating third zone 332 from
first zone 328 and second zone 330 that differs from the embodiments of FIG. 7. More
specifically, while internal boundary 161 is located approximately a uniform distance
from upper peripheral edge 220 in the embodiments of FIGS. 6-8, curvature of boundary
361 can be inverted relative to upper peripheral edge 320 such that portions of internal
boundary 361 may be spaced apart from upper peripheral edge 320 by varying distances.
For example, portions of internal boundary 361 disposed closer to second zone 330
may be spaced apart from upper peripheral edge 320 by a larger distance than other
portions. Thus, the width of third zone 332 between upper peripheral edge 320 and
internal boundary 361 can vary across third zone 332 in the plan view of FIG. 9. This
can allow heel knitted component 352 to conform closely to the wearer's heel for added
comfort and support.
[0056] In summary, footwear 100 can provide several advantages. Footwear 100 can be comfortable
to wear. Footwear 100 can provide support to the wearer's foot. Footwear 100 can also
flex with the wearer's foot and can flexibly conform to the wearer's foot. Physical
properties can vary across different regions of footwear 100 to further enhance performance.
Knitted Components With Gores
[0057] Various knit structures, including gores, may be incorporated into forward knitted
component 150, heel knitted component 152, or other knitted components to impart a
contoured (e.g., rounded, non-planar, or otherwise three-dimensional) configuration.
In addition to shaping or contouring the knitted components during the knitting process
that forms the knitted components, a gore may provide advantages of enhancing the
comfort of footwear 100 and increasing the overall manufacturing efficiency of footwear
100.
[0058] An example of a heel knitted component 400 that includes a gore is depicted in FIGS.
10, 11A and 11B. Heel knitted component 400 has an upper peripheral edge 401 , a lower
peripheral edge 402, a first side edge 403 that extends between upper peripheral edge
401 and lower peripheral edge 402, and a second side edge 404 that extends between
upper peripheral edge 401 and lower peripheral edge 402. Heel knitted component 400
defines an exterior surface 405 and an opposite interior surface 406.
[0059] The knit structure of heel knitted component 400 incorporates a gore region 410,
which includes a gore that imparts a contoured configuration, as depicted in FIGS.
11A and 11B. Gore region 410 is formed of unitary knit construction with a remainder
of heel knitted component 400. In addition, gore region 410 has a generally triangular
shape that is centrally-located in heel knitted component 400 and extends through
a majority (i.e., at least 50 percent) of a distance between peripheral edges 401
and 402, but may be smaller or larger in further configurations of heel knitted component
400. In this location, the portion of heel knitted component 400 that includes gore
region 410 corresponds with the location of the heel and achilles tendon of the wearer.
Gore region 410 provides a rounded aspect to heel knitted component 400, which may
enhance the comfort of footwear 100 and increase the overall manufacturing efficiency
of footwear 100.
[0060] Gore region 410 is at least partially located in a central area 407 of heel knitted
component 400, which is centrally-located or spaced inwards from edges 401-404 and
includes a center of heel knitted component 400. Gore region 410 is depicted as having
a generally triangular shape that arises from knitting a series of courses of decreasing
length, and then knitting a series of courses of increasing length to insert a gore
into heel knitted component 400. Referring to FIG. 10, a pair of courses 411 and 416
in gore region 410 have a relatively long length, a pair of courses 412 and 415 in
gore region 410 have a lesser length than courses 411 and 416, and a pair of courses
413 and 414 in gore region 410 have a lesser length than each of courses 411, 412,
415, 416. As such, the generally triangular shape of gore region 410 is formed by
knitting courses of varying length in central area 407. Note that courses 411-416
are selected for purposes of example and gore region 410 may have numerous other courses,
some of which are located between or otherwise separate courses 411-416. Additional
details regarding the process for forming gore region 410 will be discussed in greater
detail below.
[0061] The configuration of gore region 410, as discussed above and depicted in the figures,
provides one example that is suitable for footwear 100. In other configurations of
heel knitted component 400, gore region 410 may have a variety of other shapes, including
diamond, square, rectangular, elliptical, round, or irregular, depending upon the
specific knitting method utilized to form gore region 410. In further configurations,
the size or location of gore region 410 may vary considerably to provide specific
features (e.g., three-dimensional regions) to heel knitted component 400 or other
areas of heel knitted component 400. The orientation of gore region 410 may also vary.
A structure that is similar to gore region 410 may also be incorporated into forward
knitted component 150 to impart a three-dimensional region.
[0062] Another configuration of heel knitted component 400 is depicted in FIGS. 12 and 13
as including a plurality of peripheral gore regions 420 that are distributed along
or adjacent to lower peripheral edge 402 and on opposite sides of gore region 410.
That is, a first portion of peripheral gore regions 420 are located on one side of
the gore region 410, and a second portion of peripheral gore regions 420 are located
on an opposite side of gore region 410. Peripheral gore regions 420 form a series
of gores along a common edge (i.e., lower peripheral edge 402) of heel knitted component
400.
[0063] In comparison with gore region 410, peripheral gore regions 420 are relatively small
and may extend through less than one-third of the distance between peripheral edges
401 and 402, but may also extend through a lesser distance, including less than 20
percent, 15 percent, or 10 percent of the distance between peripheral edges 401 and
402. In some configurations, gore region 410 may be at least two times, at least three
times, or more than four times the area of each of peripheral gore regions 420. An
advantage of incorporating peripheral gore regions 420 into heel knitted component
400 relates to the rounded, non-planar, or otherwise three-dimensional configuration.
More particularly, peripheral gore regions 420 may impart greater curvature to heel
knitted component 400 than gore region 410 alone, as depicted through a comparison
of FIGS. 11A and 13. Moreover, the combination of gore region 410 and each of peripheral
gore regions 420 may further impart a contoured configuration to the area of heel
knitted component 400 that is adjacent to lower peripheral edge 420. As with gore
region 410, peripheral gore regions 420 may be formed by knitting a series of courses
of decreasing length, and then knitting a series of courses of increasing length to
insert gores into heel knitted component 400.
[0064] A vertical axis V and horizontal axis H are superimposed over heel knitted component
400 in Figures 11A and 13. An angle 431 represents the deflection of heel knitted
component 400 from vertical axis V. Similarly, an angle 432 represents the deflection
of heel knitted component 400 from horizontal axis H. In the absence of gore region
410, angle 431 would be substantially zero in each of Figures 11A and 13. Given that
gore region 410 imparts contouring or curvature, however, heel knitted component 400
deflects away from vertical axis V and angle 431 is greater than zero. In the absence
of peripheral gore regions 420, angle 432 would be substantially similar in Figures
11A and 13. Given that peripheral gore regions 420 imparts contouring or curvature,
however, angle 432 is less in Figure 13 than in Figure 11A. That is, the curvature
in heel knitted component 400 due to peripheral gore regions 420 causes portions of
heel knitted component 400 that are adjacent to lower peripheral edge 402 to approach
horizontal axis H.
[0065] Gore regions 410 and peripheral gore regions 420 each assist in imparting the contoured
configuration to heel knitted component 400. Given that gore region 410 extends through
a majority of a distance between peripheral edges 401 and 402, gore region 410 may
be primarily responsible for imparting the overall rounded shape to heel knitted component
410, as depicted in FIGS. 11A and 11B. Given that peripheral gore regions 420 are
located along lower peripheral edge 402, peripheral gore regions 420 may be primarily
responsible for imparting a more rounded shape to the area of heel knitted component
410 that is adjacent to lower peripheral edge 402. Accordingly, gore region 410 and
peripheral gore regions 420 operate cooperatively to form the rounded, non-planar,
or otherwise three-dimensional configuration to specific areas of heel knitted component
400.
[0066] Peripheral gore regions 420 effectively curve or contour the portion of heel knitted
component 400 that is adjacent to lower peripheral edge 402 to facilitate attaching
heel knitted component 400 to one or both of forward knitted component and an upper
surface or other portions of sole structure 110. In some configurations, the contoured
configuration in heel knitted component 400 forms a lip that is approximately parallel
to the upper surface of sole structure 110 and may be used in place of strobel 125
to facilitate attachment of heel knitted component 400 to sole structure 110. In addition,
in some configurations, lower areas of forward knitted component 150 may include gore
regions that are similar to peripheral gore regions 420 to continue to extend the
lip around the periphery of upper 120 and facilitate attachment of upper 120 to sole
structure 110. In some cases, this structure may be used together with strobel 125
or another strobel sock, or this structure may replace the use of a strobel 125.
[0067] A further configuration of heel knitted component 400 is depicted in FIG. 14A, wherein
gore region 410 extends inward from upper peripheral edge 401 and into an area corresponding
with central area 407. Referring to FIG. 14B, heel knitted component 400 has the general
shape of heel knitted component 152 and incorporates gore region 410 into this shape.
Another configuration of heel knitted component 400 is depicted in FIG. 14C as having
a U-shaped configuration. Accordingly, various aspects relating to location of gore
region 410 and the overall shape of heel knitted component 400 may vary considerably.
[0068] The manner in which heel knitted component 400 is incorporated into footwear 100
is depicted in FIGS. 15 and 16. Although the overall shape of heel knitted component
400 varies from the shape of heel knitted component 152, heel knitted component 400
may be incorporated into footwear 100 in a similar manner. More particularly, first
rear edge 210 of forward knitted component 150 can be coupled to first side edge 403
of heel knitted component 400, and second rear edge 212 of forward knitted component
150 can be coupled to second side edge 404 of heel knitted component 400. In addition,
lower peripheral edge 402 may be secured to strobel 125 or an upper surface of sole
structure 110. In some configurations, the shapes and locations of first rear edge
210 and second rear edge 212 of forward knitted component 150 may be modified to join
with side edges 403 and 404. Although heel knitted component 400 and forward knitted
component 150 are depicted as being secured to strobel 125, strobel 125 may be absent
in some configurations of footwear 100.
[0069] When incorporated into footwear 100, gore region 410 extends upward in heel region
103 and through a majority of a distance between sole structure 110 and upper edge
132, which forms opening 121 (e.g., an ankle opening of upper 120). In this location,
the convex configuration of interior surface 406 contacts and conforms with the heel
and achilles tendon area of the wearer. Given that the rounded aspect of heel knitted
component 400 may better conform with the contours of the wearer's foot than a planar
knitted component, heel knitted component 400 may enhance the comfort of footwear
100. When incorporated into footwear 100, peripheral gore regions 420 are located
in heel region 103 and proximal to the interface between sole structure 110 and upper
120. In this location, the rounded aspect of heel knitted component 400 adjacent to
lower peripheral edge 404 conforms with the shape of an upper surface of midsole 111.
Given that incorporating one or both of gore region 410 and peripheral gore regions
420 also shapes heel knitted component 400 during the knitting process, the number
of shaping processes that occur prior to or during the lasting process that forms
footwear 100 is decreased, thereby increasing the overall manufacturing efficiency
of footwear 100.
Knitting Machine Configuration
[0070] Although knitting may be performed by hand, the commercial manufacture of knitted
components is generally performed by knitting machines. An example of a knitting machine
500 that is suitable for producing any of knitted components 150, 152, and 400 is
depicted in FIG. 17. Knitting machine 500 has a configuration of a V-bed flat knitting
machine for purposes of example, but knitted components 150, 152, and 400 or aspects
of knitted components 150, 152, and 400 may be produced on other types of knitting
machines.
[0071] Knitting machine 500 includes two needle beds 501 that are angled with respect to
each other, thereby forming a V-bed. Each of needle beds 501 include a plurality of
individual needles 502 that lay on a common plane. That is, needles 502 from one needle
bed 501 lay on a first plane, and needles 502 from the other needle bed 501 lay on
a second plane. The first plane and the second plane of the two needle beds 501 are
angled relative to each other and meet to form an intersection that extends along
a majority of a width of knitting machine 500. As is conventional with this form of
knitting machine, needles 502 each have a first position where they are retracted
and a second position where they are extended. In the first position, needles 502
are spaced from the intersection where the first plane and the second plane meet.
In the second position, however, needles 502 pass through the intersection where the
first plane and the second plane meet.
[0072] A pair of rails 503 extend above and parallel to the intersection of needle beds
501 and provide attachment points for multiple feeders 504. Due to the action of a
carriage 505, feeders 504 move along rails 503 and needle beds 501, thereby supplying
yarns to needles 502. In FIG. 17, a yarn 506 is provided to one of feeders 504 by
a spool 507. More particularly, yarn 506 extends from spool 507 to various yarn guides
508, a yarn take-back spring 509, and a yarn tensioner 510 before entering feeder
504. Although not depicted, additional spools 507 may be utilized to provide yarns
to other feeders 504.
Manufacturing Process
[0073] A manufacturing process that utilizes knitting machine 500 to form the configuration
of heel knitted component 400 depicted in FIG. 10 will now be discussed. Initially,
a portion of heel knitted component 400 is formed by knitting machine 500, as depicted
in FIG. 18A. In forming this portion of heel knitted component 400, feeder 504 repeatedly
moves along rail 503 and various courses are formed from at least yarn 506. More particularly,
needles 502 pull sections of yarn 506 through loops of a prior course, thereby forming
another course. It should be noted that although heel knitted component 400 is depicted
as being formed from one yarn 506, additional yarns may be incorporated into heel
knitted component 400 from further feeders 504.
[0074] Knitting machine 500 now begins the process of forming gore region 410, as depicted
in FIG. 18B, by knitting a series of courses of decreasing length. More particularly,
course 411 is formed, course 412 with a lesser length is formed after course 411,
and then course 413 with an even lesser length is formed after each of courses 411
and 412. As courses 411, 412, and 413 are respectively formed with decreasing length,
portions of previously-formed courses may be held on needles 502.
[0075] As the manufacturing process continues, as depicted in FIG. 18C, knitting machine
500 forms a remainder of gore region 410 by knitting a series of courses of increasing
length. More particularly, course 414 is formed, course 415 with a greater length
is formed after course 414, and then course 416 with an even greater length is formed
after each of courses 414 and 415. As courses 414, 415, and 416 are respectively formed
with increasing length, portions of previously-formed courses that were held on needles
502 are now joined with courses 414-416.
[0076] Based upon the above discussion, knitting machine 500 forms gore region 410 by knitting
a first series of courses of decreasing length (e.g., courses 411-413), and then knitting
a second series of courses of increasing length (e.g., courses 414-416) to insert
a gore into heel knitted component 400, thereby forming gore region 410. Following
the formation of gore region 410, the knitting process continues, as depicted in FIG.
18D, and a substantial portion of the remainder of heel knitted component 400 is formed.
[0077] The general process discussed above for forming gore region 410 may also be employed
to form each of peripheral gore regions 420. Referring to FIG. 19, knitting machine
500 is depicted as forming the configuration of heel knitted component 400 depicted
in FIG. 12. As with gore region 410, peripheral gore regions 420 may be formed by
knitting a series of courses of decreasing length, and then knitting a series of courses
of increasing length to form gores in each of peripheral gore regions 420 and along
or adjacent to lower peripheral edge 402.
[0078] In addition to forming knitted heel component 400, knitting machine 500 may be utilized
to form other knitted components or combinations of knitted components. Referring
to FIG. 20, for example, a knitted component 600 is depicted as including forward
knitted component 150 and another heel knitted component 610 that are formed of unitary
knit construction. That is, the combination of forward knitted component 150 and heel
knitted component 610 are formed as a one-piece element through a knitting process.
In this configuration, a peripheral edge 602 extends continuously from forward knitted
component to heel knitted component 610 and may be secured to strobel 125 or sole
structure 110. Moreover, a side edge 603 of heel knitted component 610 may be joined
to rear edge 210 of forward knitted component 150 to form opening 121 when incorporating
knitted component 600 into footwear 100. In addition, heel knitted component 610 includes
a gore region 620. Accordingly, substantially all of upper 120, including a gore in
gore region 620, may be formed of unitary knit construction through a single knitting
process.