FIELD OF THE INVENTION
[0001] The present invention relates to personal depilatory devices generally.
BACKGROUND OF THE INVENTION
[0002] Various types of depilatory apparatus are known in the art. One type of manually
operated device, exemplified in U.S. Patents 2,458,911, 2,486,616 and 1,743,590 and
Swiss Patent 268,696, employs a coil spring which engages hairs in spaces between
the convolutions thereof and pulls the hair away from the skin as the spaces between
the convolutions are closed. The operation of this type of device is highly inefficient,
slow and painful.
[0003] Early power driven depilatory devices are exemplified in U.S. Patent 4,079,741 of
present Applicants. U.S. Patent 4,079,741 describes a hair removal device employing
an axially disposed helical spring which is simultaneously driven in axial rotation
by an electric motor and reciprocatingly compressed and extended by a cam operated
by the electric motor. This apparatus is relatively complex and costly and has not
reached the market.
[0004] A highly successful power driven depilatory device is described in Applicant's U.S.
Patent 4,524,772 which shows an electrically powered depilatory device including a
hand-held portable housing, motor apparatus disposed in the housing and a helical
spring comprising a plurality of adjacent windings arranged to be driven by the motor
apparatus in rotational sliding motion relative to skin bearing hair to be removed,
the helical spring including an arcuate hair engaging portion arranged to define a
convex side corresponding thereto whereat the windings are spread apart and a concave
side corresponding thereto whereat the windings are pressed together, the rotational
motion of the helical spring producing continuous motion of the winding from a spread-apart
orientation at the convex side to a pressed together orientation at the concave side
and for engagement and plucking of hair from the skin, whereby the surface velocities
of the windings relative to the hair greatly exceed the surface velocity of the housing
relative thereto.
SUMMARY OF THE INVENTION
[0005] The present invention seeks to provide a power driven personal depilatory device
having enhanced hair removing capabilities while lowering user discomfort.
[0006] There is thus provided in accordance with a preferred embodiment of the present invention
a human hair depilatory device including a hand held portable housing, a first element
arranged to be driven in rotational motion relative to skin bearing hair to be removed,
said first element including a plurality of hair engaging locations at which adjacent
hair engaging surfaces of the first element are spread apart when the hair engaging
locations are disposed by rotation at a convex side and at which the adjacent hair
engaging surfaces of the first element are moved relatively towards each other in
hair engaging arrangement when the hair engaging locations are disposed by rotation
at a concave side, the rotational motion of the first element producing motion of
the hair engaging locations from the convex side to the concave side for engagement
and removal of hair from the skin and a second element disposed interiorly of the
first element and arranged to be driven in rotational motion and to define a hair
support for hair engaged between adjacent hair engaging surfaces.
[0007] Further in accordance with a preferred embodiment of the invention there is provided
a human hair depilatory device including a hand held portable housing, a first element
arranged to be driven in rotational motion relative to skin bearing hair to be removed,
said first element including a plurality of hair engaging locations at which adjacent
hair engaging surfaces of the first element are spread apart when the hair engaging
locations are disposed by rotation at a convex side and at which the adjacent hair
engaging surfaces of the first element are moved relatively towards each other in
hair engaging arrangement when the hair engaging locations are disposed by rotation
at a concave side, the rotational motion of the first element producing motion of
the hair engaging locations from the convex side to the concave side for engagement
and removal of hair from the skin and a second element disposed interiorly of the
first element and arranged to define a hair path defining support for hair engaged
between adjacent hair engaging surfaces, the hair path defining support causing the
engaged hair to extend along a generally arcuate path.
[0008] In accordance with a preferred embodiment of the invention, the second element is
operative such that the length of hair which may be tensioned by engagement with the
hair engaging surfaces of the first element sufficiently to enable removal thereof
from the skin is effectively increased by the provision of the second element.
[0009] According to one embodiment of the invention, the second element is arranged to be
driven in rotational motion by the first element.
[0010] Further in accordance with an embodiment of the invention the second element is arranged
to be driven in rotational motion with the first element.
[0011] Additionally in accordance with an embodiment of the invention, the hair support
has a radius which is at least one quarter of the radius of the first element.
[0012] Further in accordance with an embodiment of the invention the hair support has a
radius which is at least one half of the radius of the first element.
[0013] In accordance with a preferred embodiment of the invention, the hair support has
a radius which is at least three quarters of the radius of the first element.
[0014] Additionally in accordance with a preferred embodiment of the present invention,
the human hair depilatory device also includes a generally stationary third element
disposed interiorly of the first and second elements.
[0015] Further in accordance with the foregoing embodiment of the invention, the human hair
depilatory device further includes at least one fourth element disposed intermediate
the second and third elements for providing desired spacing therebetween.
[0016] In accordance with a preferred embodiment of the invention, the first element comprises
a helical spring. The first element may comprise a multiplicity of adjacent disks.
The first element may comprise a unitary element. Alternatively, the first element
may comprise a plurality of discrete elements which cooperate for hair engagement.
[0017] In accordance with a preferred embodiment of the present invention, the first and
second elements have generally circular cross sections and the radius of the circular
cross section of the second element is nearly as large as that of the first element.
[0018] In accordance with an embodiment of the present invention, there is provided a human
hair depilatory device including a hand held portable housing, a hair engagement element
arranged to be driven in rotational motion relative to skin bearing hair to be removed
for engagement and removal of the hair from the skin, and apparatus for causing the
hair engagement element to undergo vibration.
[0019] In accordance with an embodiment of the invention there is provided a human hair
depilatory device including a hand held portable housing, a hair engagement element
arranged to be driven in rotational motion relative to skin bearing hair to be removed
for engagement and removal of the hair from the skin and apparatus for applying vibrations
to the skin during hair engagement and removal.
[0020] In accordance with an embodiment of the present invention, there is provided a human
hair depilatory device including a hand held portable housing, a hair engagement element
arranged to be driven in rotational motion relative to skin bearing hair to be removed,
said hair engagement element including a plurality of hair engaging locations at which
adjacent hair engaging surfaces of the hair engagement element are spread apart when
the hair engaging locations are disposed by rotation at a convex side and at which
the adjacent hair engaging surfaces of the first element are moved relatively towards
each other in hair engaging arrangement when the hair engaging locations are disposed
by rotation at a concave side, the rotational motion of the hair engagement element
producing motion of the hair engaging locations from the convex side to the concave
side for engagement and removal of hair from the skin and apparatus for causing the
hair engagement element to undergo vibration having a component of amplitude lying
in a plane of rotation thereof.
[0021] In accordance with one embodiment of the present invention, the apparatus for causing
comprises at least one element mounted internally of the hair engagement element.
[0022] In accordance with a preferred embodiment of the invention, the at least one element
comprises a spacer disk eccentrically mounted on a stationary element located within
the hair engagement element.
[0023] In accordance with an alternative embodiment of the invention, the apparatus for
causing comprises a rotatable element which periodically engages the hair engagement
element.
[0024] In accordance with a further alternative embodiment, the apparatus for causing comprises
apparatus for skewed mounting of the hair engagement element whereby rotation thereof
produces oscillation thereof.
[0025] Further in accordance with a preferred embodiment of the invention there is provided
a human hair depilatory device including a hand held portable housing and a hair engagement
element arranged to be driven in rotational motion relative to skin bearing hair to
be removed for engagement and removal of the hair from the skin and being configured
to undergo vibration as it depilates. According to one embodiment, the hair engagement
element may be configured to define a plurality of mutually off-center sections.
[0026] In accordance with a preferred embodiment of the invention, the hair engagement element
comprises a helical spring.
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The present invention will be understood and appreciated more fully from the following
detailed description, taken in conjunction with the drawings in which:
Fig. 1 is an illustration of stages of operation of prior art depilatory apparatus;
Fig. 2 is a generalized illustration of stages of operation of depilatory apparatus
constructed and operative in accordance with a preferred embodiment of the present
invention;
Figs. 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H and 3I are sectional illustrations of nine alternative
embodiments of depilatory apparatus constructed and operative in accordance with a
preferred embodiment of the present invention;
Figs. 4A, 4B, 4C, 4D, 4E, 4F, 4G, 4H and 4I are cross sectional illustrations of the
nine alternative embodiments of depilatory apparatus constructed and operative in
accordance with a preferred embodiment of the present invention, illustrated in Figs.
3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H and 3I;
Figs. 5A, 5B, 5C and 5D are partially cut away sectional illustrations of the mounting
of four alternative embodiments of depilatory apparatus illustrated respectively in
Figs. 3A, 3D, 3H and 3I;
Fig. 6 is a front view of the exterior of a depilatory device constructed and operative
in accordance with an embodiment of the invention;
Fig. 7 is a front view of the interior of the depilatory device of Fig. 6;
Fig. 8 is a side view of the exterior of the depilatory device of Figs. 6 and 7;
Fig. 9 is a side view of the interior of the depilatory device of Figs. 6 - 8;
Fig. 10 is a pictorial illustration of the removable engagement of helical springs
at a non driven end thereof with the housing of the depilatory device in the embodiment
of Figs. 6 - 9;
Fig. 11 is a pictorial illustration of the removable engagement of helical springs
at a driven end thereof with the housing of the depilatory device in the embodiment
of Figs. 6 -10;
Fig. 12 is a sectional illustration of the engagement shown in Fig. 11, taken along
the lines XII - XII in Fig. 11;
Fig. 13 is a cut away front view of a depilatory device constructed and operative
in accordance with an additional embodiment of the invention;
Fig. 14 is a cut away side view corresponding to the front view of Fig. 13;
Figs. 15A and 15B are generalized illustrations of two alternative embodiments of
a depilatory device constructed and operative in accordance with another preferred
embodiment of the present invention;
Figs. 16A and 16B are illustrations of two alternative versions of a depilatory device
constructed and operative in accordance with another preferred embodiment of the present
invention and having a vibratory movement;
Figs. 17A - 17D are illustrations of the operation of the apparatus of Figs. 16A and
16B;
Fig. 18 is a superimposed sectional illustration taken along lines XVIII - XVIII of
Fig 16A, illustrating the eccentric motion of the depilatory device;
Fig. 19 is an illustration of another embodiment of depilatory device displaying vibratory
movement;
Figs. 20 and 21 are illustrations of yet another embodiment of depilatory device displaying
vibratory movement; and
Figs. 22A and 22B are illustrations of skewed mounting of a hair engagement element
for producing vibratory movement during depilation.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0028] The present invention relates generally to a human hair depilatory device of the
type illustrated generally in Figs. 6, 13, 15A or 15B. The overall structure of the
device may be summarized as including a hand held portable housing, a first element
arranged to be driven in rotational motion relative to skin bearing hair to be removed,
the first element including a plurality of preferably arcuate hair engaging locations
at which adjacent hair engaging surfaces of the first element are spread apart when
the hair engaging locations are disposed by rotation at a convex side and at which
the adjacent hair engaging surfaces of the first element are moved relatively towards
each other in hair engaging arrangement when the hair engaging locations are disposed
by rotation at a concave side, the rotational motion of the first element producing
motion of the hair engaging locations from the convex side to the concave side for
engagement and removal of hair from the skin.
[0029] In accordance with an embodiment of the present invention there is provided a second
element disposed interiorly of the first element to define a hair support for hair
engaged between adjacent hair engaging surfaces. Various constructional and operational
characteristics of the second element which enable it to reduce pain encountered during
use of the depilatory device will be described hereinbelow in detail.
[0030] Prior art devices and particularly a human hair depilatory device constructed and
operative in accordance with U.S. Patent 4,524,772 of the present inventors employ
a helical spring and a fixed interior guiding element, indicated respectively in Fig.
1 as elements 10 and 12. In the prior art, the arrangement of the helical spring is
such that at the concave side only a portion of the spring windings lie sufficiently
close together to enable gripping of most human hair therebetween. This portion typically
covers about 25% of the perimeter of the spring 10, and is indicated by cross-hatching
in the drawing of Fig. 1. The interior guiding element 12 has an outer diameter which
is less than one quarter of the outer diameter of the helical spring.
[0031] The operation of the prior art apparatus for a relatively long human hair is illustrated
in Fig. 1. Stage 1 shows a hair 14, having a root location 15, engaged between windings
of the spring but not grasped thereby. Stage II illustrates the hair 14 being drawn
along with the spring windings as they rotate in the direction indicated by arrow
16. Stage III illustrates the hair being grasped between the spring windings within
the cross-hatched grasping region at a grip location A.
[0032] At stage IV, tensioning of the hair is shown, as location A rotates further away
from the root location 15, producing pulling on the skin in the vicinity of the root,
and resulting normally in some pain. The illustrated tensioning, while sufficient
to produce some pain, is not sufficient to remove the hair from the skin because the
length of the hair between the location on the hair at which the hair is gripped and
root location 15 is not sufficiently less than the length of the shortest path between
location A at stage IV and the root location along which the hair can lie.
[0033] It is noted that the presence of interior element 12 does not appreciably increase
the length of the shortest path along which the hair can lie between location A and
the root location.
[0034] Accordingly, following stage IV, the hair 14 is released in stage V. Thereafter,
it may occur that the same hair is again engaged at a location closer to its root
location 15 and gripped by the spring windings at a grip location B, as illustrated
in stage VI. The hair is tensioned in stage VII, producing pain. This time, however,
the hair is removed, as illustrated in stage VIII, because the length of the hair
between the location on the hair at which the hair is gripped and root location 15
is sufficiently less than the length of the shortest path along which the hair can
lie between location B, intermediate stages VII and VIII, and the root location.
[0035] It may thus be appreciated that in the prior art, multiple tensionings with attendant
pain may be encountered before relatively long hair is in fact removed.
[0036] The present invention will now be described with reference to Fig. 2. It will be
shown for example that hair of length within a given range which would have been tensioned,
and then released without being removed using the prior art apparatus, is removed
using the depilatory apparatus of the present invention.
[0037] The embodiment of Fig. 2 comprises a first element 20, which is preferably a helical
spring but which may alternatively be any other suitable element, including a plurality
of hair engaging locations at which adjacent hair engaging surfaces of the first element
are spread apart when the hair engaging locations are disposed by rotation at a convex
side and at which the adjacent hair engaging surfaces of the first element are moved
relatively towards each other in hair engaging arrangement when the hair engaging
locations are disposed by rotation at a concave side, the rotational motion of the
first element producing motion of the hair engaging locations from the convex side
to the concave side for engagement and removal of hair from the skin.
[0038] According to a preferred embodiment of the present invention illustrated in Figs.
2 and 6 - 9, the arrangement of the first element is such that along about preferably
75% of the perimeter of the first element, the hair engaging surfaces lie sufficiently
close together to enable gripping of most human hair therebetween. This portion is
indicated by cross-hatching in the drawing of Fig. 2.
[0039] In the embodiment of Fig. 2, as compared with the prior art represented in Fig. 1,
there is provided a second, interior, element 22 which causes hair grasped by the
first element to lie along a path which is preferably generally parallel to the perimeter
of the first element. In accordance with the present invention, the second element
appreciably increases the length of the shortest path along which the hair can lie
between location A and the root location, in contrast to the prior art.
[0040] Referring now to Fig. 2 it can be seen that stage I is essentially the same as stage
I of the operation of the prior art apparatus, shown in Fig. 1. Comparing stages II
and III of the embodiment of Fig. 2 and of the prior art, it is seen that the configuration
of the second element 22 constrains the hair to extend along a path between the hair
root location 24 and a grip location A which is longer than the shortest path between
those two locations.
[0041] Accordingly, when the hair is tensioned, as illustrated in stage IV, shown in Fig.
2, the hair generally follows the curvature of the second element 22, defining a much
longer path than the corresponding "short cut" along which the hair extends in stage
IV of Fig. 1. It can be seen therefore that when grip location A is in the same position
in Fig. 1 and Fig. 2, the hair is pulled under tension a longer distance in the embodiment
of Fig. 2 than in the prior art shown in Fig. 1. This can be seen at stage IV by observing
that, in Fig. 2, the skin is shown deformed near the root much more than in Fig. 1.
[0042] It is an additional preferred feature of the invention that the percentage of the
perimeter of the first element along which hair is gripped between adjacent hair engaging
surfaces is increased in the present invention as compared with the prior art. According
to a preferred embodiment of the invention, hair is gripped along about three-quarters
of the perimeter of the first element, while in the prior art embodiment shown in
Fig. 1, the percentage is generally only about 25%.
[0043] The increased percentage of perimeter along which gripping takes place, when combined
with provision of the second element according to the present invention, further increases
the distance along which the hair is pulled under tension, thus further increasing
the likelihood that a hair will be removed when it is tensioned.
[0044] Thus, as seen in stage V, the hair is removed upon being tensioned the first time,
and subsequent tensioning or tensionings of the hair as shown in stages VI, VII and
VIII in Fig. 1 are obviated.
[0045] Reference is now made to Figs. 3A - 3I and Figs. 4A - 4I corresponding thereto, which
illustrate a plurality of alternative embodiments of depilatory apparatus useful in
the present invention. It will be appreciated that the selection of embodiments illustrated
herein is not intended to be exhaustive but rather exemplary. For example, although
the first element is shown herein as a helical spring, it may alternatively be any
other type of spring or any other suitable element or collection of elements which
are operative to engage hair as described above.
[0046] Figs. 3A and 4A illustrate an embodiment wherein the first element 20 typically comprises
a helical spring and the second element 22 typically comprises a solid, resilient,
generally cylindrical element typically formed of plastic. Here the ratio between
the outer diameters of the second element and of the first element is approximately
7:10.
[0047] Figs. 3B and 4B illustrate an embodiment generally similar to that of Figs. 3A and
3B wherein the second element 22, instead of being solid, has a central aperture or
bore 30.
[0048] Figs. 3C and 4C illustrate an embodiment generally similar to that of Figs. 3A and
4A but wherein the ratio between the outer diameters of the second element and of
the first element is greater than in the embodiment of Figs. 3A and 3B. In the embodiment
of Figs. 3C and 4C, the first and second elements may be touching and may be in frictional
engagement such that rotation of the first element also drives the second element
for rotation therewith, with or without slippage.
[0049] Figs. 3D and 4D illustrate an embodiment corresponding to the embodiment of Figs.
3C and 4C but wherein the second member 20, instead of being solid, is formed with
a central aperture or bore 30.
[0050] Figs. 3E and 4E illustrate an embodiment wherein the first element is typically a
helical spring and the second element is an elongate body 32, typically formed of
plastic, having a generally star-shaped cross section.
[0051] Figs. 3F and 4F illustrate an embodiment, similar to that of Figs. 3E and 4E but
wherein a central aperture or bore 34 is formed in body 32.
[0052] Figs. 3G and 4G illustrate an embodiment somewhat similar to that of Figs. 3D and
4D wherein a third element 36, typically in the form of a fixed guide wire, is disposed
interiorly of a hollow second element 38. Desired location of the second element about
the third element 36 is provided by a plurality of spacing rings 40 which are typically
integrally formed with second element 38 and extend radially inward into the hollow
portion thereof.
[0053] Figs. 3H and 4H illustrate an alternative embodiment of the general configuration
of Figs. 3G and 4G wherein the spacing rings are not integrally formed with the hollow
second element 38 but are instead discrete elements 42.
[0054] Figs. 3I and 4I illustrate an embodiment of the general type shown in Figs. 3A and
4A but wherein the ratio of the diameter of the second element 22 to the diameter
of the first element 20 is smaller, preferably as low as 1:4.
[0055] Reference is now made to Figs. 5A - 5D which illustrate various mounting arrangements
for the depilatory apparatus described above. Fig. 5A illustrates mounting of apparatus
of the general configuration illustrated in Figs. 3A and 4A. It may be seen that one
end of the first element 20 is drivingly mounted onto a drive gear 50, while the opposite
end of first element 20 is similarly mounted onto a rotatable support element 52.
Drive gear 50 and support element 52 are rotatably mounted on respective fixed pin
supports 55 and 54. The second element 22 is not directly mounted onto either of elements
50 and 52 but is supported by first element 20 and is normally driven for rotation
by the rotation thereof.
[0056] Fig. 5B illustrates a mounting configuration for apparatus of the general configuration
illustrated in Figs. 3B and 4B with the addition of a fixed wire 56. Fixed wire 56
provides a rotatable mounting for drive gear 50 and for rotatable support element
52 and defines the overall configuration of elements 20 and 22.
[0057] Fig. 5C illustrates a mounting configuration for apparatus of the general configuration
of Figs. 3H and 4H and is similar to the mounting illustrated in Fig. 5B, except that
spacing rings 42 rotate relative to the fixed wire 56.
[0058] Fig. 5D illustrates a mounting configuration for apparatus of the general type illustrated
in Figs. 3I and 4I which differs from the mounting arrangement of Figs. 5A and 5B
in that both drive gear 50 and rotatable support element 52 are rotatably mounted
on the second element, here designated by reference numeral 60, which is here typically
formed of metal.
[0059] According to a preferred embodiment of the invention the second element is arranged
for rotation. In the embodiments of Figs. 3A - 3H and 4A - 4H, the second element
may be driven for rotation by the first element via frictional engagement therebetween.
According to an alternative embodiment of the invention, the second element may be
arranged to be stationary. Such an arrangement is shown in the embodiment of Figs.
3I, 4I, and 5D.
[0060] Reference is now made to Figs. 6 - 12 which illustrate a preferred embodiment of
depilatory device constructed and operative in accordance with a preferred embodiment
of the invention.
[0061] The depilatory apparatus comprises a housing 70, typically formed of an impact resistant
plastic material, which housing is configured to be hand-held in use. The housing
70 defines a body portion 72 which is typically integrally formed with an operating
head support portion 74.
[0062] Mounted interiorly of the body portion 72 of housing 70 is an electric motor 76 (Fig.
7). The operation of motor 76 is controlled by a manually operable switch plate 78
which is disposed outside of housing 70 and connected to a switch 80 associated with
motor 76. Motor 76 drives a gear 82, which is fixedly mounted onto the shaft 84 of
motor 76.
[0063] First and second generally elongate helical springs 86 and 88 or other suitable first
elements are fixedly attached at one end thereof to centrally apertured rotatable
end members 90 and at an opposite end thereof to apertured end members 92 having gear
teeth 94 on their cylindrical edge surfaces. Disposed interiorly of and generally
coaxially with helical springs 86 and 88 are second elements operative as described
above. Examples of suitable second elements are illustrated in Figs. 3A - 3I and 4A
- 4I.
[0064] Helical springs 86 and 88 are rotatably mounted onto housing 70 by means of mounting
pins 96 (Fig. 9) which are fixedly located at an extreme end 98 of head support portion
74 and by means of mounting pins 100 which are fixedly located in housing 70, as illustrated.
Mounting pins 96 each rotatably engage an aperture formed in a respective rotatable
end member 90 while mounting pins 100 each rotatably engage an aperture formed in
a respective rotatable end member 92.
[0065] As seen particularly in Figs. 11 and 12, the arrangement of pins 100 is such that
the gear teeth of end members 92 are drivingly engaged and that the gear teeth of
one of end members 92 are drivingly engaged by gear 82. In this way, springs 86 and
88 are driven in respective opposite directions, as indicated by arrows 102 and 104.
[0066] If desired, the springs 86 and 88 and associated end members may be arranged for
easy removal and replacement.
[0067] Reference is now made to Figs. 13 and 14, which illustrate an alternative embodiment
of depilatory device. The depilatory apparatus comprises a housing 170, typically
formed of an impact resistant plastic material, which housing is configured to be
hand-held in use. The housing 170 defines a body portion 172 which is typically integrally
formed with an operating head support portion 174.
[0068] Mounted interiorly of the body portion 172 of housing 170 is an electric motor 176.
The operation of motor 176 is controlled by a manually operable switch plate 178 which
is disposed outside of housing 170 and connected to a switch 180 associated with motor
176. Motor 176 drives a gear 182, which is fixedly mounted onto the shaft 184 of motor
176.
[0069] First and second generally elongate helical springs 186 and 188 are fixedly attached
at one end thereof to centrally apertured rotatable end members 190 and at an opposite
end thereof to apertured end members 192 having gear teeth 194 on their cylindrical
edge surfaces.
[0070] Helical springs 186 and 188 are rotatably mounted onto housing 170 by means of mounting
pins 196 (Fig. 14) which are fixedly located at an extreme end 198 of head support
portion 174 and by means of mounting pins 200 (Fig. 13) which are fixedly located
in housing 170, as illustrated. Mounting pins 196 each rotatably engage an aperture
formed in a respective rotatable end member 190 while mounting pins 200 each rotatably
engage an aperture formed in a respective rotatable end member 192.
[0071] As seen particularly in Fig. 13, the arrangement of pins 200 is such that the gear
teeth of end members 192 are drivingly engaged and that the gear teeth of one of end
members 192 are drivingly engaged by gear 182. In this way, springs 186 and 188 are
driven in respective opposite directions, as indicated by arrows 202 and 204.
[0072] As in the embodiment of Figs. 6 - 12, the provision of stiffening wires is not essential
for maintaining the springs in predetermined generally arcuate orientation. The springs
186 and 188 and associated end members may be arranged for easy removal and replacement.
[0073] As distinct from the embodiment of Figs. 6 - 12 in which the springs 86 and 88 are
in a generally parallel orientation as seen best in Figs. 6 and 7, in the embodiment
of Figs. 12 and 13 the springs 186 and 188 are arranged in a spread-apart orientation,
typically a convex orientation as illustrated, such that end members 190 and 192 are
closer together than are the midsections of springs 186 and 188. It is noted that
springs 186 and 188 may lie in a plane or preferably may be somewhat curved, as can
be appreciated from a consideration of Fig. 14.
[0074] Reference is now made to Figs. 15A and 15B which illustrate two alternative embodiments
of a depilatory device constructed and operative in accordance with a preferred embodiment
of the invention. The depilatory device of Fig. 15A includes a driving motor 210 having
a drive shaft 212 which drives a first driving gear 214, which drivingly engages a
second driving gear 216. Depilatory apparatus 218, typically of the type illustrated
in Figs. 3A and 4A, but alternatively of any suitable type, is driven for rotation
by driving gears 214 and 216. The illustrated loop orientation of the depilatory apparatus
218 is preferably maintained by one or more supports 220 which rotatably engage a
first element 222 of the depilatory apparatus. Mounting of the depilatory apparatus
of Fig. 15A is similar to that illustrated in Fig. 5A.
[0075] The embodiment of Fig. 15B is similar to Fig. 15A and accordingly identical reference
numerals are used for designating similar structure. In contrast to the structure
of Fig. 15A, as illustrated, which employs depilatory apparatus of the general type
illustrated in Figs. 3A and 4A, the apparatus of Fig. 15B employs depilatory apparatus
of the general type illustrated in Figs. 3G, 3H, 4G, 4H, 5B and 5C, including a stationary
third element 224 disposed interiorly of and generally coaxially with a second elongate
element 226. Mounting of the depilatory apparatus of Fig. 15B is similar to that illustrated
in either of Figs. 5B and 5C, but do not require supports 220.
[0076] Reference is now made to Figs. 16A and 16B which illustrate portions of two alternative
versions of an alternative embodiment of the invention, which are particularly characterized
in that they produce vibratory motion of the hair engagement element. As seen in Figs.
16A and 16B, the depilatory device includes a first driving gear 254, which drivingly
engages a second driving gear 256. Depilatory apparatus 258, typically of the type
illustrated in Figs. 3A and 4A, but alternatively of any suitable type, is driven
for rotation by driving gears 254 and 256.
[0077] The illustrated loop orientation of the depilatory apparatus 258 is preferably maintained
by a stationary stiffening wire 260. Rotatably mounted for eccentric motion about
the stiffening wire 260 is a vibrating drive washer 262 which rotates together with
the depilatory apparatus 258, and specifically with the spring 264, relative to stiffening
wire 260, thus producing vibratory motion of depilatory apparatus 258. In Fig. 16A,
a single such washer 262 is provided, while in Fig. 16B, multiple washers 262 are
illustrated, it being understood that any suitable number of such washers may be employed.
[0078] Reference is now made to Figs. 17A - 17D, which illustrate the vibratory motion of
the depilatory apparatus 258, and indicate four different typical relative orientations
of spring 264 relative to stiffening wire 260. Fig 18, which is a superimposed illustration
of the various relative positions shown in Figs. 17A - 17D, graphically illustrates
the vibratory motion, which preferably occurs above 7000 rpm.
[0079] Reference is now made to Fig. 19, which illustrates depilatory apparatus 270 which
provides vibratory motion during depilation. In this embodiment, a coil spring 272
is bent at intervals to define a plurality of sections 274 which are off-axis with
respect to each other, as illustrated. Rotation of the spring 272 produced by rotation
of drive gears 276 and 278 produces a vibratory action of the individual sections
274 in the plane of their rotation.
[0080] Reference is now made to Figs. 20 and 21 which illustrate an alternative embodiment
of the present invention which provides vibratory motion during depilation. The illustrated
apparatus comprises a housing 280, which defines a body portion 282 which is typically
integrally formed with an operating head support portion 284.
[0081] Mounted interiorly of the body portion 282 of housing 280 is an electric motor 286.
The operation of motor 286 is controlled by a manually operable switch plate 288 which
is disposed outside of housing 280 and connected to a switch 290 associated with motor
286. Motor 286 drives a gear 292, which is fixedly mounted onto the shaft 294 of motor
286.
[0082] A helical spring 300 and an impacting member 302 are fixedly attached at one end
thereof to centrally apertured rotatable end members 304 and at an opposite end thereof
to apertured end members 306 having gear teeth 308 on their cylindrical edge surfaces.
[0083] Helical spring 300 and impacting member 302 are typically rotatably mounted onto
housing 280 by means of mounting pins 310 which are fixedly located at an extreme
end 312 of head support portion 284 and by means of mounting pins 314 which are fixedly
located in housing 280, as illustrated. Mounting pins 310 each rotatably engage an
aperture formed in a respective rotatable end member 304 while mounting pins 312 each
rotatably engage an aperture formed in a respective rotatable end member 306.
[0084] Impacting member 302 is provided with a transversely extending rotatable protrusion
320, which periodically impacts helical spring 300, causing it to be displaced transversely
and to have a convex curvature at its outer surface, as illustrated, thereby causing
adjacent hair engaging surfaces thereof to be spread apart, as illustrated in Fig.
20. When the helical spring 300 is not engaged by the rotatable protrusion 320, the
adjacent hair engaging surfaces of the first element are moved relatively towards
each other in hair engaging arrangement.
[0085] Reference is now made to Figs. 22A and 22B, which illustrate two alternative orientations
of a further alternative embodiment of the invention similar to that illustrated in
Fig. 9, but wherein the arrangement of a mounting pin 330 is skewed with respect to
rotatable end member 90. Due to this skewed mounting, rotation of the associated helical
spring 332 produces time varying undulations of the helical spring, as can be seen
by comparing Figs. 22A and 22B. These time varying undulations are typically periodic
and thus provide a vibratory motion during depilation.
[0086] It is appreciated that features illustrated herein with reference to separate embodiments
can, whenever appropriate, be provided in combination.
[0087] It will be appreciated by persons skilled in the art that the present invention is
not limited by what has been particularly shown or to the specific type of hair engagement
element shown and described hereinabove. Rather the scope of the present invention
is defined only by the claims which follow:
1. A human hair depilatory device comprising:
a hand held portable housing;
a first element arranged to be driven in rotational motion relative to skin bearing
hair to be removed, said first element comprising a plurality of hair engaging locations
at which adjacent hair engaging surfaces of the first element are spread apart when
the hair engaging locations are disposed by rotation at a convex side and at which
the adjacent hair engaging surfaces of the first element are moved relatively towards
each other in hair engaging arrangement when the hair engaging locations are disposed
by rotation at a concave side, the rotational motion of the first element producing
motion of the hair engaging locations from the convex side to the concave side for
engagement and removal of hair from the skin; and
a second element disposed interiorly of said first element and arranged to be driven
in rotational motion and to define a hair support for hair engaged between adjacent
hair engaging surfaces.
2. A human hair depilatory device comprising:
a hand held portable housing;
a first element arranged to be driven in rotational motion relative to skin bearing
hair to be removed, said first element comprising a plurality of hair engaging locations
at which adjacent hair engaging surfaces of the first element are spread apart when
the hair engaging locations are disposed by rotation at a convex side and at which
the adjacent hair engaging surfaces of the first element are moved relatively towards
each other in hair engaging arrangement when the hair engaging locations are disposed
by rotation at a concave side, the rotational motion of the first element producing
motion of the hair engaging locations from the convex side to the concave side for
engagement and removal of hair from the skin; and
a second element disposed interiorly of said first element and arranged to define
a hair path defining support for hair engaged between adjacent hair engaging surfaces,
said hair path defining support causing said engaged hair to extend along a generally
arcuate path.
3. A human hair depilatory device according to either of claims 1 and 2 and wherein
said second element is operative such that the length of hair which may be tensioned
by engagement with the hair engaging surfaces of the first element along a distance
sufficient to enable removal of the hair from the skin is effectively increased by
the provision of the second element.
4. A human hair depilatory device according to claim 1 and wherein said second element
is arranged to be driven in rotational motion by said first element.
5. A human hair depilatory device according to either of claim 1 or claim 3 and wherein
said second element is arranged to be driven in rotational motion with said first
element.
6. A depilatory device according to any of the preceding claims and wherein said hair
support and said first element have generally circular cross sections defining respective
radii and wherein the radius of said hair support is at least one quarter of the radius
of the first element.
7. A depilatory device according to claim 6 and wherein the radius of said hair support
is at least one half of the radius of the first element.
8. A depilatory device according to claim 6 and wherein the radius of said hair support
is at least three quarters of the radius of the first element.
9. A depilatory device according to any of the preceding claims and also comprising
a generally stationary third element disposed interiorly of said first and second
elements.
10. A depilatory device according to claim 9 and also comprising at least one fourth
element disposed intermediate said second and third elements for providing desired
spacing therebetween.
11. A depilatory device according to any of the preceding claims and wherein said
first element comprises a helical spring.
12. A depilatory device according any of the preceding claims and wherein said first
element comprises a multiplicity of adjacent elements.
13. A depilatory device according to any of the preceding claims and wherein said
first element comprises a unitary element.
14. A depilatory device according to any of the preceding claims 1 - 12 and wherein
said first element comprises a plurality of discrete elements which cooperate for
hair engagement.
15. A depilatory device according to any of the preceding claims and wherein said
first and second elements have generally circular cross sections and wherein the radius
of the circular cross section of the second element is nearly as large as that of
the first element.
16. A human hair depilatory device comprising:
a hand held portable housing;
a hair engagement element arranged to be driven in rotational motion relative to skin
bearing hair to be removed for engagement and removal of the hair from the skin; and
means for causing the hair engagement element to undergo vibration.
17. A human hair depilatory device comprising:
a hand held portable housing;
a hair engagement element arranged to be driven in rotational motion relative to skin
bearing hair to be removed, said hair engagement element including a plurality of
hair engaging locations at which adjacent hair engaging surfaces of the hair engagement
element are spread apart when the hair engaging locations are disposed by rotation
at a convex side and at which the adjacent hair engaging surfaces of the first element
are moved relatively towards each other in hair engaging arrangement when the hair
engaging locations are disposed by rotation at a concave side, the rotational motion
of the hair engagement element producing motion of the hair engaging locations from
the convex side to the concave side for engagement and removal of hair from the skin;
and
means for causing the hair engagement element to undergo vibration having a component
of amplitude lying in a plane of rotation thereof.
18. A human hair depilatory device according to either of claims 16 and 17 and wherein
said means for causing comprises at least one element mounted internally of the hair
engagement element.
19. A human hair depilatory device according to claim 18 and wherein, said at least
one element comprises a spacer disk eccentrically mounted on a stationary element
located within the hair engagement element.
20. A human hair depilatory device according to either of claims 16 and 17 and wherein
said means for causing comprises an external rotatable element which engages the hair
engagement element.
21. A human hair depilatory device according to either of claims 16 and 17 and wherein
said means for causing comprises apparatus for skewed mounting of the hair engagement
element whereby rotation thereof produces oscillation thereof.
22. A human hair depilatory device comprising:
a hand held portable housing;
a hair engagement element arranged to be driven in rotational motion relative to skin
bearing hair to be removed for engagement and removal of the hair from the skin; and
means for applying vibrations to the skin during hair engagement and removal.
23. A human hair depilatory device comprising:
a hand held portable housing; a hair engagement element arranged to be driven in rotational
motion relative to skin bearing hair to be removed for engagement and removal of the
hair from the skin and being configured to undergo vibration as it depilates.
24. A human hair depilatory device according to claim 23 and wherein said hair engagement
element is formed with a plurality of mutually off-centered sections.
25. A human hair depilatory device according to any of claims 16 - 24 and wherein
said hair engagement element comprises a helical spring.