JP2015051258A - Sandal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pair of sandals which proved a wearer with sufficient exercise effect.SOLUTION: A body 11 that composes a sandal 10 includes: a front body part 12 on which a toe-side sole is placed; and a rear body part 13 on which a heel-side sole is placed. The front body part 12 is configured to have a weight balance so as to be lower than the rear body part 13. A bottom surface of the front body part 12 has a first curved portion 12a which serves as a downward concave surface in a front-rear direction, and a second curved portion which serves as a downward concave surface in a right-left direction.

Description

  The present invention relates to a sandal capable of realizing a beautiful leg by an exercise effect.

In recent years, sandals and the like aiming at an exercise effect have been proposed as in the following patent documents, for example.
In the configuration described in Patent Document 1, the bottom surface of the shoe sole is formed in a round shape in the front-rear direction.

  In the configuration described in Patent Document 2, the footwear bottom is formed in an arc shape in the front-rear direction.

JP 2009-528879 A Utility Model Registration No. 3168694

  In the sandals having the conventional configuration described in Patent Document 1 and Patent Document 2, although the bottom surface is formed in a round shape or an arc shape in the front-rear direction, the center of gravity is set at the center in the front-rear direction. Therefore, when worn, it is similar to ordinary shoes and sandals, and it is difficult to obtain a sufficient exercise effect.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide a sandal that can provide a sufficient exercise effect.

  To achieve the above object, the sandal of the present invention is configured such that the toe side of the sole is placed on the front portion of the main body and the heel side of the sole is placed on the heel holding portion of the rear portion of the main body. The bottom surface of the main body is formed in a convex curved shape in the front-rear direction, and the center of gravity is set at the front portion of the main body.

  Therefore, according to this sandal, since the center of gravity is set at the front part of the main body, it becomes easy to be in a state close to a toe when worn, and a strong load acts on the wearer's calf and the like.

  According to the sandals of the present invention, since a strong load acts on the wearer, a sufficient exercise effect can be obtained.

The side view which shows the sandal in 1st Embodiment. The perspective view which shows the state which looked at the sandal from diagonally upward of the rear part. The perspective view which shows the state which looked at the sandal from diagonally downward. The top view which shows a sandal. Sectional drawing in the part of the instep holding | maintenance part of a sandal. Sectional drawing of the state which looked at the sandal from the left side. The side view which shows the state which put on the sandal and was stationary. The side view which shows the state which put the weight on the back side. The side view which shows the state which moved the weight a little forward from the state of FIG. The side view which shows the state which moved weight further from the state of FIG. 9, and kicked up. The perspective view which shows the sandal of 2nd Embodiment and shows the state which looked at the sandal from diagonally upward of the rear part. The disassembled perspective view of the state which looked at the sandal from diagonally upward. Sectional drawing in the part of the instep holding | maintenance part of a sandal. The side view which shows the state which put on the sandal and was stationary. The side view which shows the state which moved the weight forward from the state of FIG. The perspective view which shows the sandal of the example of a change and shows the state which looked at the sandal from diagonally upward of the rear part. The perspective view which shows the sandal of the modified example different from FIG. 16, and shows the state which looked at the sandal from diagonally upward of the rear part. Furthermore, the perspective view which shows the sandal of the example of a different change, and shows the state which looked at the sandal from diagonally upward of the rear part. Sectional drawing in the part of the instep holding | maintenance part of the sandal of FIG.

(First embodiment)
Hereinafter, 1st Embodiment of a sandal is described in detail based on FIGS.
As shown in FIGS. 5 and 6, the main body 11 of the pair of left and right sandals 10 is configured such that a skeleton portion 19 formed of a hard resin is covered with an outer cover portion 20 formed of a soft resin. 20 improves the feel to the sole. As the hard resin, a hard synthetic resin such as polyurethane resin, polyvinyl chloride resin, or polyester resin is used. As the soft resin, ethylene-vinyl acetate copolymer resin (EVA), thermoplastic elastomers such as polyethylene elastomers and polystyrene elastomers, and the like are used.

  As shown in FIG.1 and FIG.2, 12 is a front part of the main body for placing the toe side of the sole, and 13 is a rear part of the main body as a heel holding part for placing the heel side of the sole. As shown in FIGS. 5 and 6, the bottom surface 12 </ b> A of the main body front portion 12 is composed of a first curved surface 12 a that has a convex curved surface downward in the front-rear direction and a second curved surface 12 b that has a convex curved surface downward in the left-right direction. Has been. The curvature of the second curved surface 12b is set larger than the curvature of the first curved surface 12a. For example, the radius of curvature of the first curved surface 12a on the ground contact surface is preferably in the range of 100 to 150 mm, and the radius of curvature of the second curved surface 12b is preferably in the range of 50 to 90 mm. Since the first and second curved surfaces 12a and 12b are thus formed, the bottom surface 12A of the main body 11 has a substantially spherical shape that swells.

  As shown in FIGS. 1 and 2, the center of gravity of the sandal 10 is set at the main body front portion 12. In other words, when the sandal 10 is not in use, the weight balance of the sandal 10 and the curvature of the first curved surface 12a are set so that the main body front portion 12 side is lower than the main body rear portion 13 side. The body is configured to support the weight on the front side 12 of the main body. Further, the weight balance is set so that the top surface of the sandal 10 is substantially horizontal when viewed from the front with the sandal 10 being worn. On the upper surface of the main body rear portion 13, there is provided a ridge mounting portion 14 made of a soft material and formed into a flat, substantially egg shape and a gentle concave shape.

  As shown in FIG. 1, a curved recess 15 is formed at the bottom of the main body rear portion 13 so as to open toward the rear and both sides. The concave portion 15 reduces the mass of the main body rear portion 13 and shifts the center of gravity of the entire sandal 10, that is, the weight balance to the main body front portion 12.

  As shown in FIGS. 1 and 5, the upper surface of the main body front portion 12 is formed with a ridge 16 protruding between the thumb and forefinger of the toe. This umbilical cord 16 is located slightly inside the center position in the width direction on the upper surface of the front portion 12 of the main body. Further, the umbilical cord 16 is formed in a substantially elliptical shape that is inclined rearward and whose cross section is long in the front-rear direction. For this reason, it becomes easy to pinch with the thumb and forefinger, and when the sandal 10 is worn, the snare 16 can be firmly held in a stable state by the thumb and forefinger.

  As shown in FIGS. 1 and 4, an upper portion holding portion 17 is formed at the upper end portion of the umbilical cord 16 so as to contact the instep of the foot. The instep holding portion 17 has a curved shape along the surface of the instep. In addition, the metallic luster layer 18 by plating is provided on the upper surface of the upper holding portion 17 to enhance the design.

  As shown in FIGS. 1 and 2, a protrusion 21 is provided on the upper surface of the portion between the main body front portion 12 and the main body rear portion 13 to press the arch of the sole. The protrusion 21 is formed in a curved shape so as to hit almost the entire arch when the sandal 10 is worn.

  As shown in FIG. 3, the bottom surface 12 </ b> A of the main body front portion 12 is provided with a bottom ellipsoidal anti-slip portion 22 that suppresses slippage between the main body front portion 12 and the like. The anti-slip portion 22 is formed of a material having a high coefficient of friction such as synthetic rubber such as polyurethane rubber, natural rubber, or thermoplastic elastomer.

Next, an effect | action is demonstrated about the sandal 10 comprised as mentioned above.
As shown in FIG. 7, when the sandal 10 is worn, the nose 16 is sandwiched between the thumb and the index finger of the toe 25 and the instep holding portion 17 is made to contact the instep of the foot. In the state where the sandal 10 is worn, since the center of gravity of the sandal 10 is on the front side, a load on the lower part of the front part acts on the wearer. Therefore, a wearer will be in the state close | similar to toe standing as shown in FIG. Moreover, since the lower surface of the main body 11 is formed in a substantially spherical shape as a whole by the first curved surface 12a in the front-rear direction and the second curved surface 12b in the left-right direction, it is in a contact state with a small area at the apex portion of the spherical surface. For this reason, the sandal wearer needs to balance up and down in the front-rear direction and the left-right direction and the combined direction of the front-rear direction and the left-right direction. In addition, since the foot 26 is in a low position on the toe 25 side and in a high position on the heel 27 side in the wearing state, much of the weight is supported on the toe 25 side. Accordingly, a strong load is applied to the entire lower limbs and the muscles are tightened strongly, not only in the calf muscles and thigh muscles, even in the resting state or not in the resting state.

  Next, as shown in FIGS. 8 to 10, when walking with the sandals 10 worn, the ground contact position p between the main body 11 and the floor surface 24 continuously moves in the front-rear direction, thereby smoothly moving the weight. Can do. Accordingly, a large load acts on the lower limbs, but stable walking can be performed. Further, since the main body 11 and the floor surface 24 are in contact with each other in a small area at the ground contact position p, the direction can be easily changed by rotating around the ground contact position p.

Therefore, according to this embodiment, the following effects can be obtained.
(1) Since the center of gravity of the sandal 10 of this embodiment is on the front side, in the wearing state, the center of gravity of the wearer moves to the front side, and the wearer is guided to a forward leaning posture. In order to resist this, in other words, the wearer is in a state of being close to the tiptoe to struggle. Therefore, even if the wearer is only standing or moving the toes up and down, a heavy load is applied to the calves and thighs, and an effective exercise effect is obtained, increasing muscle strength and burning fat. Is promoted, and healthy legs can be realized. In addition, since the wearer's heel is supported at the rear part of the main body 11, the wearer can stand up and walk in a stable state. At this time, it is effective to correct the posture of the whole body if it is conscious that the center of the ear, shoulder, hip joint, and foot is in a straight line when viewed from the side.

  (2) In the sandal 10 of this embodiment, the bottom surface of the main body 11 having the upper holding part 17 is formed in a convex curved shape in the front-rear direction and the left-right direction. For this reason, when the sandal 10 is worn, the sandal 10 tends to tilt in the front-rear direction, the left-right direction, and the synthesis direction (oblique direction). Therefore, the wearer will still straddle, balance training will be performed naturally, and the muscles and calf, thighs, etc. will be given muscular strength and fat burning, which will give an effective exercise effect. Thus, healthy legs can be realized as described above.

  (3) Further, since the snare 16 is grasped with the toes, the sandal 10 can be put up in a stable state and can stand up or walk, and a more effective exercise effect can be given to the ankle and the like. it can.

(4) Since the instep holding part 17 can be applied to the instep 28 of the foot 26, the sandal 10 becomes difficult to take off, and a walking operation or the like can be performed stably.
(5) Since the recessed part 15 is formed in the rear part of the main body 11, the center of gravity of the main body 11 can be set naturally on the front side of the main body 11 without using a weight or the like. Therefore, as described above, the wearer can obtain a weight balance in a forward-downward posture. For this reason, a wearer's weight can be supported by the toe 25 whole, and the correct posture which a back muscles can extend can be taken. In addition, in this state, the wearer is close to the toe standing posture, so that the calf muscles and thigh muscles are trained. In addition, since the wearer's heel is supported by the heel mounting portion 14, even if the posture is close to toe standing, the wearer's heel can stably stand up or walk.

(6) Since the weight is supported by the ground contact position p having a small area on the front portion 12 of the main body, a smooth rotation operation around the ground contact position p can be obtained, which is convenient for changing the direction.
(7) The main body 11 is formed by coating a skeleton portion 19 formed of a hard resin with an outer cover portion 20 formed of a soft resin. For this reason, the touch of the sole when the sandal 10 is worn can be improved while maintaining the strength and rigidity of the sandal 10.

  (8) A non-slip portion 22 is provided on the bottom surface 12 </ b> A of the main body front portion 12. Therefore, it is possible to stand up and walk in a stable state while wearing the sandal 10, and to prevent the floor surface 24 from being damaged.

  (9) Between the main body front portion 12 and the main body rear portion 13, a protrusion 21 that presses the arch of the sole is provided. For this reason, when the sandal 10 is put on, the sole can be supported in a stable state, and health can be improved by stimulating the arch.

(Second Embodiment)
Next, a second embodiment of the sandal will be described based on FIGS. 11 to 15 with a focus on differences from the first embodiment.

The sandal 10 of this embodiment has a symmetrical shape, and can be used for both the left and right feet.
Further, in this embodiment, as shown in FIGS. 11 and 12, the umbilical cord 16 is omitted, and the instep holding portion 17 is a pair of holdings that rise from the main body front portion 12 toward the upper surface side of the instep. It is comprised by the piece 17a. And as shown in FIG.11 and FIG.13, the connection part 17c with a narrow width | variety and thin thickness is integrally formed between the front-end | tips of the holding piece 17a. For this reason, the connection part 17c does not restrain the movement of the upper holding | maintenance part 17 very much.

  In this embodiment, as shown in FIG. 13, shallow unevenness (not shown) for preventing slippage is formed on the entire outer peripheral surface of the main body 11 made of EVA. The main body 11 constitutes the entire skeleton, and a bottom cover 202 is detachably fitted in a recess 201 on the upper surface of the main body 11. A slipping cloth 29 for preventing slipping is attached to the upper surface of the bottom covering 202. Convex portions 203 are formed on both sides of the upper surface of the center portion in the front-rear direction of the bottom cover 202.

  As in the first embodiment, the shape of the bottom surface 12A of the main body 11 of the sandal 10 includes a first curved surface 12a that is a convex curved surface downward in the front-rear direction and a second curved surface 12b that is a convex curved surface downward in the left-right direction. The curvature thereof is the same as that of the first embodiment, and the bottom surface 12A of the main body 11 has a substantially spherical shape that swells. However, in this embodiment, since the concave portion 15 at the bottom of the main body rear portion 13 is not provided, the first curved surface 12 a is extended to the rear end of the main body 11. Also in this embodiment, the center of gravity of the sandal 10 is set in the main body front portion 12, and the main body front portion 12 side is lower than the main body rear portion 13 side when the sandal 10 is not used. The weight balance of the sandal 10 and the curvature of the first curved surface 12a are set so that is substantially horizontal when viewed from the front. Accordingly, the body weight is stably supported on the main body front portion 12 side when the sandal 10 is put on a stationary state.

  Therefore, as shown in FIGS. 14 and 15, when wearing the sandal 10, the feet are placed on the sole 202 and the toes are placed in the upper holding portion 17. In this state, as in the first embodiment, since the center of gravity of the sandal 10 is on the front side, the wearer is in a state close to a toe as shown in FIG. For this reason, a wearer needs to balance and much weight is supported by the toe 25 side. Therefore, a strong load is applied to the entire lower limbs including the calves and thighs, and these muscles are tightened. Moreover, when walking with the sandal 10 worn, the weight can be moved smoothly by continuous movement of the ground contact position p between the main body 11 and the floor surface 24 in the front-rear direction, and stable walking can be performed. In addition, the direction can be easily changed by rotating around the ground contact position p.

  Table 1 summarizes the experience results of 50 women wearing the sandals 10 of this embodiment. In this case, as shown in Table 1, the body 11 and five types of hardness were prepared. For the main body 11 having five types of hardness, one type of bottom cover 202 having a hardness of 40 is used. Moreover, the curvature radius of the front-back direction of the 1st curved surface 12a of the bottom face 12A of each sandal 10 is 120 mm, and the curvature radius of the left-right direction of the 2nd curved surface 12b is 70 mm. As can be seen from Table 1, in this test, the results of the sensation showing the feeling given to the body were good in the order of the sandals 10 having the main body 11 of hardness 50, 53, 60, 47, 44. Further, in terms of ease of use, good results were obtained in the order of the sandals 10 having the main body 11 with hardness 44, 47, 50.53, 60. The said hardness is shown by the hardness measured with the JIS K6253 type A durometer which is Japanese Industrial Standard.

Therefore, in this embodiment, there are the following effects in addition to the effects of the first embodiment, except for the effects caused by the chord 16 and the recess 15 in the first embodiment.

(10) Since the movement of the upper holding part 17 is not so restrained, the upper holding part 17 is flexibly deformed according to the movement of the foot. For this reason, the sandal 10 is comfortable to wear.
(11) Since the bottom cover 202 separate from the main body 11 is provided, cleanliness can be maintained by removing the bottom cover 202 and washing it.

  (12) Since the sole 202 exhibits a buffering effect, it is comfortable to wear. In particular, convex portions 203 are formed on both sides of the upper surface of the center portion in the front-rear direction of the bottom cover 202. For this reason, since the convex part 203 on one side hits the arch, it is possible to obtain a comfortable wearing comfort, and the convex part 203 on the other side part supports the outside of the sole of the foot, so that a stable wearing state is obtained. Can do.

(Example of change)
It should be noted that the embodiment described above can be modified and embodied as follows.
As shown in FIG. 16, a cloth ribbon 30 made of black or the like serving as a design accent may be wound around the connecting portion 17 c between the pair of holding pieces 17 a of the upper holding portion 17.

As shown in FIG. 17, the umbilical cord 16 may be omitted, and the belt-shaped upper holding portion 17 may be spanned between the left and right side portions of the main body front portion 12.
As shown in FIGS. 18 and 19, the chord 16 is omitted and the upper holding portion 17 is raised from the left and right side portions of the main body front portion 12 toward the center upper portion of the main body front portion 12 and has a pair of elasticity. The holding piece 17a may be used. In this case, the tips of the holding pieces 17a may be opposed or overlap each other with a space therebetween, but the holding pieces 17a are expanded against the elasticity according to the height of the upper and the left and right widths. Therefore, the sandal 10 can be appropriately held in a state where the sandal 10 is worn, and the sandal 10 is easy to wear. In the example shown in FIGS. 18 and 19, the main body 11 is composed of two upper and lower core members 11 a and 11 b made of EVA (ethylene vinyl acetate copolymer resin). These core materials 11a and 11b are bonded to each other or integrated by heat welding, ultrasonic welding, vibration welding, or the like. Further, the core materials 11a and 11b may be integrally molded with a skin material of the same material or a different material, or may be ultrasonically bonded. Furthermore, you may comprise the whole core material with a single member.

Similarly, as shown in FIG. 19, the entire upper surface of the main body 11 may be gently dented so that the foot is wrapped from the sole side.
-As shown with a dashed-two dotted line in FIG. 1, the structure which provided the connection parts 171 and 172 between the both sides of the instep holding | maintenance part 17 and the main body front part 12 may be sufficient. In this case, the umbilical cord 16 becomes unnecessary.

-The structure which provided the umbilical cord 16 may be the structure which provided the inner side connection part 171 shown with a dashed-two dotted line in FIG. 1 (the outer side connection part 172 is not provided).
-As shown with a dashed-two dotted line in FIG.1 and FIG.2, you may provide the loop 13a hung on a wearer's heel in the main body rear part 13. FIG. If it does in this way, a wearing state will be stabilized and a stable state can be acquired especially at the time of walking.

  The anti-slip part 22 of the bottom surface 12A of the main body front part 12 may be constituted by an uneven part or by applying an anti-slip agent without being constituted by a separate member as in the first embodiment. May be.

As shown by a two-dot chain line outline in FIG. 1, the recess 15 on the bottom side of the main body rear portion 13 may be omitted.
-You may abbreviate | omit the slip prevention part 22 of the bottom face 12A of the said main body front part 12. FIG.

  -You may provide the processus | protrusion which stimulates the point of a sole in the appropriate position of the upper surface of the main body 11. FIG.

  DESCRIPTION OF SYMBOLS 10 ... Sandal, 11 ... Main body, 12 ... Front part of main body, 12A ... Bottom surface, 12a ... First curved surface, 12b ... Second curved surface, 13 ... Rear part of main body, 15 ... Recessed part, 16 ... Throat, 17 ... Upper holding part, 19 ... skeleton part, 20 ... jacket part, 21 ... protrusion, 22 ... non-slip part, 26 ... foot.

Claims (5)

The toe side of the sole is placed on the front part of the main body, and the heel side of the sole is placed on the heel holding part at the rear part of the main body. Sandals set at the front of the body. The sandal of Claim 1 which made the bottom face of the main body the convex curve shape in the left-right direction. The sandal according to claim 2, wherein the curvature in the left-right direction of the bottom surface of the main body is larger than the curvature in the front-rear direction. The sandal as described in any one of Claims 1-3 which formed the recessed part in the upper surface of the said main body, and fitted the bottom covering in the recessed part so that attachment or detachment was possible. The sandal of Claim 4 which formed the convex part in the upper surface both sides in the center part of the front-back direction of a flooring.