JP2011160975A - Shank, and footwear having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shank and footwear having the same, capable of easily changing or retaining the shape of a sole without largely changing the structure of the sole itself. <P>SOLUTION: The shank 3 includes a front part 3a corresponding to the front part of a foot, a center part 3b continuously formed from the front part 3a and corresponding to the center part of the foot, and a rear part 3c continuously formed from the center part 3b and corresponding to the rear part of the foot. The plasticity of the center part 3b is higher than that of the front part 3a or the rear part 3c. The shoe 1 having the shank 3 is also provided. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to footwear, and particularly to a sole structure.

  Conventionally, footwear having a beautiful design that is comfortable to wear has been developed. A reinforcement called a shank is built in the bottom of the footwear. In general, a shank is a bottom reinforcing member that prevents the distortion of the bottom surface, which is also called the core of the footwear and is also called the backbone of the footwear, and is indispensable for the sole construction of shoes with heels in particular. It is. The shank 103 in the conventional shoe 101 shown in FIG. 11 is disposed in the longitudinal direction from the arch to the heel of the foot, and is fastened to the lower surface of the insole to reinforce the shoe sole 104. Further, holes 103d and 103e are provided in front and rear of the shank 103, respectively. The hole 103d is fastened to the insole by eyelets, and the hole 103e is fastened to the high heel 6 by screws.

  Among high-heeled shoes, high-heeled shoes are particularly preferred by many women who place an emphasis on fashion because they have the effect of making their style look better. However, high-heeled shoes tend to get tired when standing for a long time, and there is a high risk of falling out of balance in an uneven area. Therefore, in these cases, low heel shoes are preferred with emphasis on functionality.

  As described above, high heel shoes have high fashionability, and low heel shoes have high functionality. However, it is inconvenient and inefficient to carry both high heel shoes and low heel shoes, and it is generally forced to choose one type of shoes.

  Therefore, in recent years, various proposals have been made as a new type of footwear that can enjoy variations of high heel and low heel by adjusting the height of the heel.

  For example, Patent Literature 1 discloses a shoe capable of exchanging a heel with a high heel detachably attached to a shoe with a low heel attached.

  In Patent Document 2, in a footwear in which a heel heel portion is arranged under the rear portion of the bottom, the heel portion can be attached to and detached from the rear portion of the bottom by a magnetic force, and among various types of footwear. Footwear characterized in that it is selected from and used is disclosed.

  In Patent Document 3, a plurality of arc-shaped engagement grooves are formed along the locus of a circle on the lower surface of the heel portion of the shoe body, and a locking heel corresponding to each of the plurality of engagement grooves is formed on the upper surface of the auxiliary heel. A shoe heel is disclosed in which an auxiliary heel can be attached to and detached from the heel portion of the shoe main body by projecting the hook and engaging and disengaging the locking heel with the engaging groove.

  Patent Document 4 discloses a high and low heel switching shoe having a structure in which a heel height is switched between a high heel and a low heel and a high and low heel switching shoe in a women's shoe. A material that expands and contracts in response to a change in the angle between the portion from the front toe of the shoe sole to the base of the finger and the central arch portion of the shoe sole caused by the change is used for the boundary between the front and the center of the shoe sole. A high and low heel switching shoe is disclosed.

  Further, Patent Document 5 includes an inner layer integrally formed from a stretchable material, and the inner layer includes a flexible top line, a heel reinforcement material and a toe reinforcement material for supporting the material, and heel reinforcement The material and toe reinforcement are spaced apart by the hinge of the material to allow relative angle variation between the buttocks and toes of the assembly member, and the material expands and contracts to accommodate the relative angle variation An assembly member for shoes is disclosed.

Japanese Utility Model Publication No. 1-1131305 JP 2006-247243 A Registered Utility Model No. 3032266 JP 2004-121765 A JP 2006-122718 A

  When the height of the heel is changed, it is necessary to change the angle between the portion corresponding to the base of the finger from the toe at the bottom of the footwear and the portion corresponding to the heel from the arch. When carrying out the invention according to the above-mentioned patent documents, in order to cope with this angle change, the footwear itself must be provided with a hinge portion. For example, in Patent Document 4, a boundary portion made of a stretchable material is provided between the front and the center of the shoe sole in order to cope with a change in the angle between the toe and the heel caused by a change in the heel height. Moreover, in patent document 5, the inner layer which consists of a stretchable material, the reinforcing material which supports this, and the hinge part of a stretchable material are provided as an assembly member. As described above, when a complicated bottom structure is adopted, it is necessary to specialize the manufacturing process of the entire shoe in manufacturing a shoe that can be changed to both high heel and low heel. Therefore, it is necessary to significantly change the existing manufacturing process, and it is extremely difficult to apply to shoes of various designs. Therefore, shoes that can enjoy both high heels and low heels are not rich in design and cannot meet the demands of fashion. Moreover, in patent document 4 and patent document 5, in order to respond | correspond to the angle change in the bottom of footwear, the flexibility of a bottom face is exhibited using an elastic member. Even with such footwear alone, the shape of the entire bottom surface can be changed, but the shape cannot be maintained, which may cause deformation during walking.

  Accordingly, an object of the present invention is to provide a shank that can deform and retain the shape of the bottom without significantly changing the manufacturing process of the bottom of the existing footwear, and an footwear having the same.

  According to the configuration of the present invention, the object is a shank built in footwear, a front part corresponding to the front of the foot, a middle part formed continuously from the front part and corresponding to the center of the foot, And a rear portion corresponding to the rear of the foot. The middle portion is achieved by a shank having higher plasticity than the front portion and the rear portion.

  The shank according to the present invention may be characterized in that the front part and the rear part are thicker than the middle part.

  The shank according to the present invention may be subjected to bead processing in the longitudinal direction.

  The shank according to the present invention may be provided with a hole or a cut in the middle part.

  In the shank according to the present invention, the front part and the rear part may be made of a material having higher strength than the middle part.

  A shank according to the present invention is a shank built in footwear, and includes a front portion corresponding to the front of the foot, a middle portion formed continuously with the front portion and corresponding to the center of the foot, and continuously with the middle portion. And a rear portion corresponding to the rear of the foot, and the middle portion may be provided with an angle adjusting bracket that bends in the front-rear direction and enables angle holding.

  The footwear according to the present invention may be one in which the shank is provided in the bottom.

  The footwear according to the present invention may be provided with an insole having stretchability in the front-rear direction on the upper side of the shank.

  The footwear according to the present invention may be provided with an insole having a bag-like outer membrane and a fluid contained in the outer membrane on the upper side of the shank.

  When the shank having the above configuration is built in flexible footwear, the middle part bends in the front-rear direction by applying weight to the bottom surface. In this case, regardless of the height of the heel, the shank is appropriately adjusted according to the change in the angle between the part corresponding to the base of the finger from the toe on the bottom and the part corresponding to the heel from the arch. The shape can be changed and held. Further, by replacing the existing shank, it is possible to provide footwear that can deform and retain the bottom without significantly changing the manufacturing process of the existing bottom.

  In addition, by adopting a shank having a front portion and a rear portion that are thicker than the middle portion, the strength of the front portion and the rear portion is increased, and the strength of the middle portion is lowered and plasticity is increased.

  By adopting a shank that has been subjected to bead processing in the longitudinal direction, the strength of the front portion and the rear portion is increased, the strength of the middle portion is decreased, and the plasticity is increased.

  By adopting a shank provided with a hole or notch in the middle part, the strength of the middle part is lowered and the plasticity is increased.

  By adopting a shank made of a material whose front part and rear part are stronger than the middle part, the strength of the front part and the rear part is increased, the strength of the middle part is lowered, and the plasticity is increased.

  According to the shank that is bent in the front-rear direction and is provided with the angle adjusting bracket that enables standing upright, the rear part can be tilted forward.

  By providing the insole having the stretchability in the front-rear direction to the footwear having the shank according to the present invention, it is possible to absorb the force that the outer side of the bottom layer is extended and the inner side that is contracted when the bottom surface is bent back and forth.

  By providing an insole having a bag-like outer membrane and a fluid contained in the outer membrane on footwear having a shank according to the present invention, a gap between the arch and the bottom surface is generated when the bottom surface curves back and forth. Can be filled.

  As described above, according to the present invention, it is possible to provide a shank that can be easily changed in shape of the conventional bottom surface and easily applied to the conventional bottom surface manufacturing process, and footwear having the same, with a simple configuration. .

It is a perspective view showing an embodiment of footwear of the present invention. It is A-A 'sectional drawing which shows the bottom of the footwear of FIG. It is a perspective view which shows the state which removed the heel of the footwear of FIG. It is a perspective view which shows the state which mounted | wore the footwear of FIG. 1 with the low heel. It is a perspective view which shows 1st embodiment of the shank of this invention. It is a figure which shows 2nd embodiment of the shank of this invention. It is a figure which shows 3rd embodiment of the shank of this invention. It is a figure which shows 4th-7th embodiment of the shank of this invention. It is a figure which shows the modification of the insole built in the footwear of this invention. FIG. 10 is a diagram illustrating a state where high heels are attached to the footwear of FIG. 9. It is a perspective view which shows the footwear of a prior art example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same members as those in the conventional example are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing an embodiment of footwear according to the present invention. The shoe 1 is a shoe for women, and is composed of a shoe bottom portion 4, a flexible upper portion 2 erected from the periphery to the upper portion, a heel portion 5, and a high heel 6 attached to the heel portion 5. Yes. As shown in FIG. 2 as a cross-sectional view taken along line AA ′ of FIG. 1, the shoe sole portion 4 includes a flexible insole 4a, a flexible insole 4b, a shank 3, It is comprised from the inside 4c which consists of a flexible cushioning material, and the bottom 4d which consists of flexible materials, such as leather. The insole 4a will be described in detail later.

  The shank 3 is a plate-like member made of iron and having plasticity and shape retention. The shank 3 is continuous with the front part 3a corresponding to the front part of the foot, that is, the part from the toe to the base of the finger, and the front part. The middle part 3b corresponding to the center part of the foot formed from the base of the finger to the arch, and the rear part 3c corresponding to the part from the arch to the heel. Become. The middle part 3b has higher plasticity than the front part 3a and the rear part 3c. In FIG. 1, the angle formed by the front part 3a and the rear part 3c of the shank 3 is about 150 degrees. A round hole 3d is provided in front of the front portion 3a, and a hole 3e is provided in the front and rear of the rear portion 3c. The eyelet enters the hole 3d and is fastened to the midsole 4b, and the screw 3 is put into the hole 3e and fastened to the high heel 6.

  The conventional shank 103 shown in FIG. 11 is arranged in a portion corresponding to the arch from the heel to the heel. On the other hand, in the present invention that enables the shape of the footwear to be changed with the shank, the shank is from the front of the foot of the shoe sole. It arrange | positions in the part corresponding to back. By using such a long shank 3 arranged from the toe to the heel, it is possible to support a long range in the front-rear direction of the foot.

  FIG. 3 is a perspective view showing a state in which the heel of the shoe 1 shown in FIG. 1 is removed. The heel portion 5 can be replaced with a heel by a screw 7. The screw 7 passes through the hole 3e located at the rear part of the shank, passes through the shoe sole part 4, and is screwed into the screw hole 8 located on the upper surface of the high heel 6.

  FIG. 4 is a perspective view showing a state where the low heel 6a is attached to the heel part 5 of the shoe 1 shown in FIG. Compared with FIG. 1, the low heel 6a is attached instead of the high heel 6 so that the angle formed between the portion corresponding to the base of the finger from the toe and the portion corresponding to the heel from the arch on the shoe sole portion 4 is increased. Yes. Accordingly, the middle portion 3b of the shank is deformed, and the angle formed by the front portion 3a and the rear portion 3c is increased. In FIG. 4, the angle formed by the front part 3a and the rear part 3c of the shank 3 is about 170 degrees.

  A method of using the shoe 1 will be described. When walking with the shoe 1 of FIG. 1, there is no difference from a general high heel shoe. Since the shank 3 has shape retention, the shape of the shoe 1 is maintained. Next, as shown in FIG. 3, the high heel 6 is removed from the heel part 5 and the low heel 6a shown in FIG. 4 is attached. At this time, the angle formed between the part corresponding to the base of the finger from the toe in the shoe sole part 4 and the part corresponding to the heel from the arch is small, and the toe warps upward when the low heel 6a is grounded. , Unnatural shape as footwear. By putting a foot on the shoe 1 and putting the weight on the shoe sole 4 on the flat ground, the highly plastic middle portion 3b of the shank 3 is plastically deformed and becomes flat. Along with this, the shoe sole portion 4 is deformed so that the angle formed between the portion corresponding to the base of the finger from the toe and the portion corresponding to the heel from the arch is increased, and the curved shoe sole portion 4a returns and warps. The toes that have been raised are grounded. Therefore, the shoe 1 functions as a low heel shoe as shown in FIG. Since the shank 3 has shape retention, it will not be deformed by normal walking.

  In the footwear as described above, a specific example of a configuration for making the shank 3 different plasticity for each part will be described below. In the first embodiment and the second embodiment, the front portion and the rear portion are reinforced. In the third embodiment, materials having different strengths are used for each part. The fourth to sixth embodiments are a weakening process of the middle part. In the seventh embodiment, the angle can be changed by adding a new member.

  FIG. 5 is a perspective view showing a first embodiment of the shank of the present invention. The shank 31 includes a front portion 31a corresponding to the toes from the toes, a middle portion 31b formed continuously from the front portions to the arches, and formed continuously from the arches. It is comprised from the rear part 31c corresponding to a heel. The front part 31a and the rear part 31c are twice as thick as the middle part 31b. For this reason, the front part 31a and the rear part 31c have a bending strength about twice that of the middle part 31b. A hole 31d and a hole 31e are provided in the front part 31a and the rear part 31c, respectively.

  When the front portion 31a and the middle portions 31b and 31c in the shank 31 are different in thickness, when the weight is strongly applied to the shank 31, only the highly plastic middle portion 31b is bent at an appropriate angle, whereas the thick front portion 31a and The rear portion 31c maintains the shape of the entire shoe sole portion 4, that is, exhibits a reinforcing function.

  FIG. 6 (A) is a perspective view showing a second embodiment of the shank according to the present invention. The shank 32 is formed continuously from the front part 32a corresponding to the toe to the base of the finger, the middle part 32b formed continuously from the front part 32a to the arch, and the middle part 32b. It is comprised from the rear part 32c corresponding to a arch from a arch to a fence. The front part 32a and the rear part 32c are provided with reinforcing beads 32f and 32g formed by beading in the longitudinal direction. For this reason, the front part 32a and the rear part 32c have a bending strength of about 1.5 to 3 times that of the middle part 32b. A hole 32d and a hole 32e are provided in the front portion 32a and the rear portion 32c, respectively.

  FIG. 6B is a B-B ′ sectional view of the reinforcing bead 32 g of the shank 32 shown in FIG. The sectional view of the reinforcing bead 32f of the front portion 32a is the same as this. The reinforcing beads 32f and 32g have a bowl shape as a whole, and have a valley shape when viewed in cross section.

  In the shank 32, since the bead processing is performed as described above, when the weight is applied to the shank, only the middle portion 32b having no reinforcing bead is bent at an appropriate angle, and the front portion 32a and the rear portion are reinforced. The shape of the entire shoe sole 4 can be maintained with 32c.

  FIG. 7 is a perspective view showing a third embodiment of the shank of the present invention. The shank 33 is formed continuously from the front portion 33a corresponding to the toe to the base of the finger, the middle portion 33b formed continuously from the front portion 33a to the arch and the middle portion 33b. It is composed of a rear portion 33c corresponding to the arch to the heel. The front part 33a and the rear part 33c are quenched and made of a material having a higher strength than the middle part 33b. The front portion 33a and the rear portion 33c are provided with a hole 33d and a hole 33e, respectively.

  In the shank 33, the material constituting the front portion 33a and the rear portion 33c is made of a material having a higher strength than that of the middle portion 33b. Therefore, when the weight is strongly applied to the shank 33, only the middle portion 33b having a lower strength has an appropriate angle. On the other hand, the front portion 33a and the rear portion 33c having high strength maintain the shape of the entire shoe sole portion 4, that is, exhibit a reinforcing function.

  A method for increasing the plasticity of the middle portion of the shank 3 by a method other than the above is shown in FIG. FIG. 8 is an enlarged view of the middle part 3b of the shank 3 of the present invention. FIGS. 8A and 8B are enlarged views of the middle portion 34b of the shank 34 according to the fourth embodiment of the present invention, and FIGS. 8C and 8D are views of the middle portion 35b of the shank 35 according to the fifth embodiment. 8 (E) and (F) are enlarged views of the middle part 36b of the shank 36 of the sixth embodiment, and FIGS. 8 (G), (H) and (I) are those of the seventh embodiment. It is an enlarged view of the middle part 37b of the shank 37. FIG.

  FIG. 8A is a plan view showing the middle part 34b of the fourth embodiment, and FIG. 8B is a cross-sectional view taken along the line C-C 'of the middle part 34b. The middle part 34b has two holes 34f penetrating in the vertical direction by punching. By forming the hole 34f in the middle portion 34b, the strength is lowered and the plasticity is increased.

  FIG. 8C is a plan view showing the middle portion 35b of the fifth embodiment, and FIG. 8D is a cross-sectional view of the middle portion 35b taken along the line D-D ′. The middle part 35b has two holes 35f that do not pass through the upper surface and the lower surface. By having the hole 35b in the middle part 35b, the strength is lowered and the plasticity is increased.

  FIG. 8E is a plan view of the middle portion 36b of the sixth embodiment, and FIG. 8F is a side view of the middle portion 36b. Three parallel cuts 36f having a length corresponding to one third of the width are provided from both side surfaces of the middle portion 35b. In the middle portion 36b, by making a cut 36f on the side surface, the strength is lowered and the plasticity is increased.

  FIG. 8G is a plan view of the middle portion 37b of the seventh embodiment, and FIGS. 8H and 8I are perspective views showing the middle portion 37b. An angle adjusting bracket 37f is provided at the center of the middle portion 37b. The angle adjusting bracket 37f has a function of bending the middle portion 37b in the front-rear direction and maintaining the angle. Therefore, when the high heel 6 is attached to the heel part 5, the appropriate angle of the shoe sole 4 in the high heel shoe can be maintained, and when the low heel 6a is attached to the heel part 5, the appropriate angle of the shoe sole part 4 in the low heel shoe. Can hold.

  FIG. 2 is a cross-sectional view taken along the line A-A ′ showing an example of the insole. The plastic insole 4a has elasticity in the front-rear direction. When the angle of the shoe sole portion 4 changes, the outside of the curved layer is pulled, and a force that the inside is slack is generated. When the insole 4a made of a stretchable member is used, since it expands and contracts in conjunction with the angle adjustment of the shank 3, it is possible to avoid relaxation and suspension on the surface of the contact surface that may occur when changing to various angles.

  By the way, when wearing high heel shoes, compared to wearing low heel shoes, the angle formed between the toe and the base of the finger and the part from the arch to the heel is reduced, that is, the toes of the toes are warped. This makes the arch arch a steeper bow. Therefore, in conventional high heel shoes, the insole corresponding to the arch is thicker than the low heel shoes, or the part corresponding to the shank arch has a sharper bow. Therefore, in footwear that can be switched between high heel and low heel, it is preferable to provide a bottom structure that sequentially adapts to the arch that is deformed by the switching, but this is not presented in the prior art.

  Therefore, an air filling structure in which air is sealed is adopted as a modified example of the insole built in the footwear in the present invention. FIG. 9A is a perspective view showing the shank 3 and the insole 204a built in the shoe 201 with the low heel 6a attached thereto. The insole 204a includes a front part 214a corresponding to the base of the finger and a rear part 224a corresponding to the arch. FIG. 9B is an E-E ′ sectional view showing the sole 204 of the shoe 201 of FIG. The same members as those of the shoe sole portion 4 are denoted by the same reference numerals. The shoe sole 204 is composed of an insole 204a, an insole 4b, a shank 3, an insole 4c, and a sole 4d in order from the top. The insole 204a has a bag-like outer membrane 234a, in which air as a fluid is sealed.

  FIG. 10A is a perspective view showing a state in which the insole 204a in the shoe 201 with the high heel 6 is deformed by applying weight. At this time, compared to FIG. 9A, the thickness of the front portion 214a is small and the thickness of the rear portion 224a is large. FIG. 10B is an F-F ′ cross-sectional view showing the shoe sole 204 of the shoe 201 of FIG.

  Since the insole 204a is sealed with air, when a part of the insole 204a is pressed, the air moves to the other part. Specifically, when the shoe 201 with the high heel 6 is worn, the weight is applied most to the base of the finger, the front part 214a located at the base is compressed, and the air in the front part 214a moves to the rear part 224a. To do. Therefore, the rear part 224a with increased air swells. As the rear portion 224a corresponding to the arch swells in this manner, the gap between the foot and the portion corresponding to the arch of the shoe sole is eliminated, and the inferior stepping comfort that occurs when a high heel is worn can be avoided. On the other hand, when the high heel 6 is replaced with the low heel 6a as shown in FIG. ○, the front part 214a and the rear part 224a are equally weighted, so the air accumulated in the rear part 224a returns to the rear part 224a, The thickness of the front part 214a and the rear part 224a becomes equal.

  The present invention can be implemented in various forms without departing from the spirit of the present invention. For example, in the above-described embodiment of the footwear, the shank 3 is fastened to the lower surface of the midsole 4b. However, the shank 3 is not limited thereto, and the shank 3 only needs to be disposed in the shoe bottom portion 4.

The difference in thickness between the front part 31a and the middle part 31b and 31c in the shank 31 of the first embodiment described above is an example, and any ratio may be used as long as the middle part 31b can have plasticity and flexibility.
The reinforcement processing applied to the front portion 32a and the rear portion 32c in the shank 32 is not limited to the above-described bead processing in the second embodiment, and may be emboss processing or other press processing.

  In the shank 33, the material which comprises the front part 33a and the rear part 33c is not restricted to the thing from which the intensity | strength by quenching of 3rd embodiment mentioned above differs. The front portion 33a and the rear portion 33c are made of, for example, iron, carbon, copper, plating, stainless steel, titanium, or steel. The middle part 33b is made of a material having a lower strength than the front part 33a and the rear part 33c, for example, aluminum, spring material, plastic, leather, fiber, etc. What consists of a raw material with little property is preferable.

  In the shanks 34, 35, and 36 of the fourth, fifth, and sixth embodiments described above, the size, depth, and number of the holes 34f, the holes 35f, and the cuts 36f are not limited. However, excessive processing is not preferable because the strength is remarkably lowered and may cause fatigue fracture of the middle portions 34b, 35b, and 36b.

  In the shank 37 of the seventh embodiment described above, the angle adjusting bracket 37f is also called a reclining mechanism. The member may not be the above-described reclining mechanism as long as the angle can be easily adjusted and the component is thin so as to avoid the uncomfortable feeling of stepping.

  The shank may have a plurality of forms from the first to the seventh embodiment at the same time.

  Moreover, in order to implement the footwear of the present invention, the footwear has a structure of the heel portion 5 capable of changing the height of the heel, or a structure in which the relative height of the heel and the toe can be adjusted. It is necessary to be. However, in the embodiment of the shoe 1 described above, the heel replacement structure with the screw 7 is provided, but the structure of the heel part 5 is not limited thereto. For example, a heel replacement structure using a magnet disclosed in Patent Document 2 or a structure in which a heel portion is rotated to switch between a high heel and a low heel disclosed in Patent Document 4 may be used.

  If a cushioning member made of felt or sponge is further used for the insole 4a in the above-described embodiment, it is possible to avoid the stepping feeling of the shank 3, particularly the front portion 3a. Further, not only the insole 4a but also the main sole 4d and the midsole 4b, when an elastic member, a plastic member, a flexible member, or the like is used at a position corresponding to the middle portion of the shank 3, the shoe sole portion 4 is used. Fatigue failure due to angle fluctuations can also be avoided.

  The filling structure in the insole 204a of the second embodiment of the insole described above is not limited to the above-described air pressure, but a fluid liquid or gel-like object may be used in the insole 204a. In any case, any structure may be used as long as the degree of close contact between the foot arch and the shoe sole is the same regardless of the height of the heel. Further, the insole may have a structure having the characteristics of the first embodiment and the second embodiment described above. For example, the insole can be composed of an outer membrane made of a stretchable member and a fluid contained in the outer membrane.

  Not only the insole but also the upper part of the footwear can be made of material and shape suitable for changing the angle of the shank. For example, a material using a stretchable material or an upper portion that does not cover the instep may be used. Specifically, if there is a gap in the side surface of footwear such as sandals, for example, if an upper part made of mesh or string is used, excessive loosening or hanging on the upper part that occurs when the shape is changed will occur. Can be avoided.

  As described above, the present invention pays attention to the structure of the shank in the footwear in which the high heel and the low heel can be replaced alternatively. According to the present invention, the shape change and holding of the bottom surface can be facilitated by changing the shank without changing the manufacturing process of the complicated shoe itself. Therefore, it is possible to provide an adjustment mechanism for the height of the heel in existing footwear of various designs.

1, 101, 201 Shoe 2 Upper part 3, 31, 32, 33, 34, 35, 36, 37, 103 Shank 3a, 31a, 32a, 33a Front part 3b, 31b, 32b, 33b, 34b, 35b, 36b, 37b Middle part 3c, 31c, 32c, 33c Rear part 3d, 3e, 31d, 31e, 32d, 32e, 33d, 33e, 34f, 35f, 103d, 103e Hole 4, 104, 204 Shoe sole part 4a, 204a Insole 4b Insole 4c Medium 4d Bottom 5 Edge 6 High heel 6a Low heel 7 Screw 8 Screw holes 32f, 32g Reinforcement bead 36f Cut 37f Angle adjustment fitting 214a Front part 224a Rear part 234a Outer membrane

Claims (9)

A shank built into the bottom of the footwear,
A front part corresponding to the front part of the foot;
A middle part formed continuously from the front part and corresponding to the central part of the foot;
And a rear part corresponding to the rear part of the foot, the middle part having a higher plasticity than the front part and the rear part.   The shank according to claim 1, wherein the front part and the rear part are thicker than the middle part.   The shank according to claim 1 or 2, wherein the front portion and the rear portion are bead-processed in a longitudinal direction.   The shank according to any one of claims 1 to 3, wherein a hole or a notch is provided in the middle part.   The shank according to any one of claims 1 to 4, wherein the front part and the rear part are made of a material having higher strength than the middle part. A shank built into the bottom of the footwear,
A front part corresponding to the front part of the foot;
A middle part formed continuously from the front part and corresponding to the central part of the foot;
A shank that includes a rear portion that is formed continuously from the middle portion and that corresponds to the rear portion of the foot, and is provided with an angle adjustment fitting that is bent in the front-rear direction and that can hold the angle.   Footwear in which the shank according to any one of claims 1 to 6 is built in the bottom.   The footwear according to claim 7, wherein an insole having elasticity in the front-rear direction is provided on the upper side of the shank.   The footwear according to claim 7, wherein an insole having a bag-like outer membrane and a fluid contained in the outer membrane is provided above the shank.

Images