KR20130127918A - Tire for handcart, wheel for handcart, handcart - Google Patents

Abstract

The present invention relates to a tire for a handcart. The tire (30) comprises: a tread and a pair of side surfaces (32). Multiple bottom holes (35) are formed in one or more of the side surfaces (32) in a line in the circumference direction (CD) of the tire (30). According to the present invention, the tire for a handcart has excellent vibration absorbing properties.

Description

Tire for Hand Cart, Wheel for Hand Cart, Hand Cart {TIRE FOR HANDCART, WHEEL FOR HANDCART, HANDCART}

The present invention relates to a tire used for a hand cart, and more particularly to a tire having sufficient durability and exhibiting excellent vibration absorption. The present invention relates to a wheel and a hand cart for a hand cart having such a tire.

Handcarts with wheels are widely used. As a hand cart, for example, a baby car used for the movement of an infant shown in JP2002-220060A, for example, a pet cart used for the movement of a pet shown in JP2006-254801A, and for carrying a luggage The trolley | bogie etc. which are used are illustrated. The tire of the hand cart is formed of a solid using resin, rubber, foamed plastic, etc., and is designed to have sufficient durability according to the use of the hand cart.

However, in a trolley used for carrying a baby car, a pet cart, or a precision instrument, it is preferable that the tire can exhibit not only sufficient durability but also excellent vibration absorption. SUMMARY OF THE INVENTION The present invention has been made in view of such a point, and an object thereof is to provide a tire for a hand cart, a wheel and a hand cart having the tire, which have sufficient durability and can exhibit excellent vibration absorption.

Hand cart tire according to the present invention,

With a ground plane and a pair of sides,

On at least one side surface, a plurality of user holes are formed side by side in the circumferential direction of the tire.

In the tire according to the present invention, the user holes are formed on both of one side surface and the other side surface, and the arrangement of the user holes formed on the one side surface is based on the user holes formed on the other side surface. The arrangement may be shifted in the circumferential direction of the tire.

In the tire according to the present invention, the user holes are formed on both of one side surface and the other side surface, and the inclination angle of the wall surface of the user hole formed on the one side surface is formed on the other side surface. It may differ from the inclination angle of the wall surface of the user hole.

In the tire according to the present invention, ribs extending around the user hole may be formed on the side surface.

In the tire according to the present invention, the user hole may have a symmetrical shape centering on an axis extending in the radial direction from the tire central axis (the axis extending in the radial direction).

In the tire according to the present invention, recesses or notches may be formed in the ground plane.

In the tire according to the present invention, when the user holes are formed on both sides, the length along the central axis of the tire from the bottom of the user hole formed on one side to the bottom of the user hole formed on the other side, It may be set to 10 mm or more.

In the tire according to the present invention, the length along the radial direction from the center axis of the tire from the end of the contact surface side to the user hole among the side surfaces may be 1 mm or more.

In the tire according to the present invention, the opening shape in the side surface of the user hole may be a triangular shape or a shape formed by chamfering one or more corners of the triangle.

In the tire according to the present invention, the triangle in the triangular shape and the shape formed by chamfering one or more corners of the triangle extends in a direction orthogonal to the radial direction from the central axis of the tire. It may be located on the said side surface so that the edge opposite to the said one side may be arrange | positioned outward in the said radial direction rather than the said one side.

In the tire according to the present invention, the triangle in the triangular shape and the shape formed by chamfering one or more corners of the triangle extends in a direction orthogonal to the radial direction from the center of the tire. An edge opposite to one side may be disposed on the side surface in such a manner as to be disposed inward in the radial direction from the one side.

In the tire according to the present invention, the opening shape in the side surface of the user hole may be a circular shape or an elliptic shape.

In the tire according to the present invention, the opening shape in the side surface of the user hole may be a shape extending in the circumferential direction.

The wheel for a hand cart according to the present invention,

Any one of the tires according to the present invention described above,

And a wheel for holding the tire.

The hand cart according to the present invention includes any of the wheels according to the present invention described above.

According to the present invention, excellent vibration absorbency can be imparted to a tire for a hand cart having sufficient durability.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows one Embodiment of this invention, Comprising: A handcart with a wheel.
2 is a side view showing an example of a tire of a hand cart.
3 is a front view illustrating the tire of FIG. 2.
4 is a cross-sectional view taken along the line IV-IV of FIG. 2.
FIG. 5 is a partial perspective view of the tire of FIG. 2; FIG.
FIG. 6 is a diagram corresponding to FIG. 2, illustrating another example of a tire. FIG.
FIG. 7 is a view corresponding to FIG. 2, showing another example of a tire. FIG.
FIG. 8 is a view corresponding to FIG. 2, showing another example of a tire. FIG.
9 is a view for explaining another example of a tire, and is a side view showing a wheel including the tire.
10 is a view corresponding to FIG. 5, showing the tire of FIG. 9.
It is a figure for demonstrating the further another example of a tire, and is a side view which shows the wheel containing the said tire.
12 is a view corresponding to FIG. 5, showing the tire of FIG. 11.
The figure for demonstrating the test method of the vibration impact test.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of this invention is described with reference to drawings.

In the following, as an example of the hand cart 5, the baby car 10 used when taking infants out will be described. However, the tires and wheels in the present invention are not limited to the baby car 10, but are used for carrying a hand cart 5 as a pet cart used for moving a pet or an article. It can be widely used for a cart configured to be pushed through an operator's hand, such as a hand cart 5 as a trolley to be used.

As shown in FIG. 1, the baby car 10 includes a baby car body 11 having a full width 12 and a back 14, and a full width 12 of the baby car body 11. The front wheel holding mechanism 13 provided in the lower end of (), and the rear wheel holding mechanism 15 provided in the lower end of the rear leg 14 of the baby car main body 11 are provided. As an example, the front wheel holding mechanism 13 may be configured as a caster that supports the wheel 20 rotatably and pivotally. In addition, the rear wheel holding mechanism 15 may be configured as a holding mechanism that supports the wheels 20 rotatably and non-reversely. Although the front wheel holding mechanism 13 and the rear wheel holding mechanism 15 may hold the wheel of a different structure, respectively, below, it demonstrates as holding the wheel 20 of the same structure.

As shown in FIG. 1, the wheel 20 has a tire 30 and a wheel 25 holding the tire 30. The wheel 25 is manufactured using resin and metal, and is rotatably held by the corresponding front wheel holding mechanism 13 or the rear wheel holding mechanism 15. On the other hand, the tire 30 is fitted to the wheel 25 and is fixed to the wheel 25.

As shown in FIGS. 2-5, the tire 30 has a ground surface 31 which contacts the ground which the baby car 10 which is the handcart 5 runs, and both sides of the ground surface 31. As shown in FIG. It has an extended side surface 32 and a back surface 33 as a surface opposing the ground surface 31. The back surface 33 is a surface that engages with the wheel 25. The pair of side surfaces 32 are planes extending in the circumferential shape about the center axis CA of the tire 30, that is, the rotation axis of the wheel 20, and are approximately the center axis CA of the tire 30. It extends on the plane orthogonal to). As can be understood from FIG. 5, the tire 30 is a shape formed by the ground plane 31, the pair of side surfaces 32, and the back surface 33, and extends in the circumferential shape.

The tire 30 is formed as a solid member, and is formed of resin, rubber, foamed plastics, or the like. The tire 30 is designed to have a predetermined strength or durability according to the use of the hand cart 5. As a typical material used for manufacturing the tire 30, an EVA crosslinked foam is exemplified. EVA crosslinked foam is an ethylene-vinyl acetate copolymer and is a thermoplastic foam produced by polymerizing ethylene-based hydrocarbons. The EVA crosslinked foam can be suitably used as a material of the tire 30 for a handcart in view of flexibility and elasticity with moderate strength. In addition, by adding rubbers to the EVA crosslinked foam, elasticity and heat resistance of the tire 30 can be improved, and the tire 30 can be colored by adding a pigment.

A plurality of user holes 35 are formed in at least one side surface 32 of the tire 30. The user hole 35 is a hole having a bottom face 36 and is distinguished from a through hole. The plurality of user holes 35 are formed side by side in the circumferential direction around the circumferential direction CD of the tire 30, that is, the rotational axis of the wheels 20. According to such a tire 30, as demonstrated by the description of the test result mentioned later, while giving sufficient durability to the tire 30, it can also provide the outstanding vibration absorbency (shock absorbency).

In addition, from the viewpoint of equalizing the vibration absorbency and durability at each position along the circumferential direction CD of the tire 30, the plurality of user holes 35 have a constant pitch in the circumferential direction CD of the tire 30. It is preferred to be arranged.

In the example shown, the some user hole 35 is formed in the 1st side surface 32a as one side surface, and the some user hole 35 is formed in the 2nd side surface 32b as the other side surface. . 3 to 5, the arrangement of the user holes 35 formed in the first side surface 32a is the circumference of the tire 30 from the arrangement of the user holes 35 formed in the second side surface 32b. It is shifted along the direction CD. In other words, the user holes 35 formed in the first side surface 32a are arranged to be displaced in the circumferential direction CD of the tire 30 with the user holes 35 formed in the second side surface 32b. Preferably, the user hole 35 formed in the first side surface 32a includes the user hole 35 formed in the second side surface 32b and the center axis CA of the tire 30, that is, the wheel 20. It is preferable to arrange | position so that it may not overlap in the direction of the rotation axis of. According to this aspect, the vibration absorbency and durability at each position along the circumferential direction CD of the tire 30 can be made uniform.

In addition, as shown in FIG. 4, the inclination angle (theta) a of the wall surface 37 of the user hole 35 formed in the 1st side surface 32a is a wall surface of the user hole 35 formed in the 2nd side surface 32b. It is different from the inclination angle [theta] b of (37). Specifically, the inclination angle θa of the wall surface 37 of the user hole 35 formed in the first side surface 32a is inclined of the wall surface 37 of the user hole 35 formed in the second side surface 32b. It is smaller than angle (theta) b.

In the production of conventional tires, a molding method using a pair of molds has been widely adopted because of the fact that tires can be manufactured at low cost. In this method, a tire is obtained in a cavity formed by combining a pair of molds. The 1st side surface of the produced tire is arrange | positioned at the position which faces one frame, and the 2nd side surface of the produced tire is arrange | positioned at the position which faces the other frame. After manufacture of the tire, the produced tire is released from at least one of the pair of molds by separating the pair of molds from each other.

And the tire 30 demonstrated here can also be manufactured cheaply by the mold which used a pair of mold similarly to the conventional tire. And the release property from the frame of the tire 30 in which the user hole 35 is formed in the side surface 32 depends on the inclination angles (theta) a and (theta) b of the wall surface 37 of the user hole 35. FIG. Therefore, when a pair of frames which produced the tire 30 of FIG. 4 space apart from each other, the tire 30 becomes easy to release from the 2nd side surface 32b side with larger inclination-angle (theta) b. In this way, when the produced tire 30 is released, the tire 30 tends to be supported by a frame on a specific side, whereby the tire 30 can be stably produced, and the productivity of the tire 30 can be improved. You can also improve.

In addition, when the user hole 35 is formed in both of the pair of side surfaces 32, from the bottom face 36 of the user hole 35 formed in the 1st side surface 32a to the 2nd side surface 32b. The length la (see FIG. 4) along the center axis CA of the tire 35, that is, the axis of rotation of the wheel 20, to the wall surface 37 of the formed user hole 35 is 10 mm or more. It is preferable that it is done. In this case, the deterioration of the strength and durability of the tire 30 due to the provision of the user holes 35 can be prevented very effectively.

Further, the length lb (see FIG. 4) along the radial direction RD from the center axis of the tire 30 from the end of the contact surface side of the side face 32 to the user hole 35 (in other words, the tire ( It is preferable that the length lb along the radial direction of 30) is 1 mm or more. In this case, the deterioration of the strength and durability of the tire 30 due to the provision of the user holes 35 can be prevented very effectively.

On the other hand, as shown well in FIG. 5, a rib 39 extending around the user hole 35 may be formed on the side surface 32 of the illustrated tire 30. In the example shown in FIG. 2, FIG. 4, and FIG. 5, the rib 39 divides the outer contour of the opening on the side surface 32 of one user hole 35 so that the said one user hole ( The opening on the side surface 32 of 35 is enclosed in a circumferential shape. According to this rib 39, the degradation of the strength and durability of the tire 30 due to the provision of the user holes 35 can be prevented very effectively. In addition, the ribs 39 shown in FIGS. 2, 4 and 5 extend to the ground plane 31. For this reason, in the example shown, the recessed part 41 or the notch 41 is formed in the ground surface 31. FIG.

Next, the opening shape on the side surface 32 of the user hole 35 is demonstrated. The opening shape on the side surface 32 of the user hole 35 can employ | adopt various shapes which can exhibit a vibration absorbency effectively. Here, some examples of the shape of the opening on the side surface 32 of the user hole 35 will be described with reference to the drawings.

In the example shown in FIG. 2 and FIG. 5, in the example shown in FIGS. 6-12 mentioned later, the opening shape of the user hole 35 is a radial direction from the center axis CA of the tire 30 ( The axis extending to RD), in other words, is linearly symmetrical about the axis extending in the radial direction of the tire 30. According to such a tire 30, the user hole 35 has the same vibration absorbing function in any of the cases in which the rotation is made in the clockwise rotation direction and the counterclockwise rotation direction around the rotation axis CA. It becomes possible to exert. That is, a predetermined vibration absorption performance can be expected regardless of the direction of the travel direction of the hand cart 5.

As shown in FIGS. 2-5, the opening shape in the side surface 32 of the user hole 35 becomes a triangular shape, or the shape formed by chamfering one or more edges of a triangle. In addition, the triangle in the triangular shape and the shape formed by chamfering one or more corners of the triangle has a radial direction RD from the center of the tire 30 (in other words, the radial direction of the tire 30). It extends in the direction orthogonal to, and is located on the side surface 32 such that an edge facing the one side is disposed outside in the radial direction RD than the one side.

By providing such a user hole 35, it is possible to give the tire 30 excellent vibration absorption while maintaining the durability of the tire 30 sufficiently. Here, the test result confirmed by the inventors is explained.

[Test summary]

The improvement of the vibration absorbency by a tire was investigated by the following method determined by the SG standard of the Product Safety Association.

[Test object]

The tire shown in FIGS. 2-5 mentioned above was produced, the produced tire was included in the commercially available baby car, and the baby car of the test subject 1 was prepared. On the other hand, marketed baby car itself was made into the test object 2. Test object 1 and test object 2 differed only in a tire, and were made the same in other points. The tire of the test subject 1 differed from the tire of the test subject 2 in the point which formed the user hole 35 and the notch 41, and made it the same in other points. The baby car of the test object 1 and the baby car of the test object 2 were comprised so that the handle position could switch between reclining, folding | folding, and a back position and a facing position similarly to the baby car shown in FIG.

〔Test Methods〕

The accelerometer was attached to the mass dummy abdomen position, with the mass dummy burned in the center of the seat of the baby car. In this state, the vibration shock test was performed on the front wheel and the rear wheel, and the vibration acceleration value was measured. As shown in FIG. 13, the vibration shock test was performed by installing a wheel on a steel drum having a diameter of 200 mm having a step of 10 mm in height. The rotation speed of the drum was 100 revolutions per minute.

〔Test result〕

Both the baby car of the test subject 1 and the two baby cars of the test subject 2 are conditions set by the SG standard of the Product Safety Association, specifically, "the vibration acceleration in the infant's abdominal position is 10 m / s ² or less". Was satisfying. When comparing the baby car of the test subject 1 and the baby car of the test subject 2, about the baby car of the test subject 1 using the tire 30 which has the user hole 35 shown in FIGS. The value of the measured vibration acceleration became smaller than the value of the vibration acceleration of the baby car of the test subject 2 measured under the same conditions. Specifically, the value of the vibration acceleration measured with respect to the baby car of the test subject 1 became about 70%-about 100% of the value of the vibration acceleration of the baby car of the test subject 2 measured under the same conditions. From the results of this experiment, it was confirmed that the vibration absorbency can be improved by providing the user holes 35 shown in FIGS. 2 to 5 in the tire 30.

[Durability evaluation]

The durability of the Baby Car of Test Subject 1 and the Baby Car of Test Subject 2 was also examined by the following method, which was determined by the SG standard of the Product Safety Association. Specifically, the durability test was performed by the following method. First, the vibration test was performed in the state which put the heavy weight on the seat of the baby car, and it confirmed by visual observation, a touch, etc. that there was no abnormality. As shown in FIG. 13, the vibration shock test was performed by installing a wheel on a steel drum having a diameter of 200 mm with a step of 10 mm in height. The rotation speed of the drum was 100 revolutions per minute. During this vibration test, the backrest of the sheet was placed in the state of being most pressed. The heavy weight was 10 kg in the center of the back of the seat, and 25 kg in the center of the seat of the seat. The handle was placed in a state where a force F of 20 N was applied vertically from above (see FIG. 13). The test time was 3 hours, and it carried out about each of the front wheel and the rear wheel. The folding operation of the baby car and the operation of switching the handle position between the back position and the facing position are repeatedly performed 20 times each time the vibration test is performed for 1 hour to confirm that there is no looseness in each part. In addition, after completion of all tests, a force of 200 N was applied in the direction in which the handles and the like were folded, and it was confirmed that the handles were not folded or the handle was unintentionally swung. In both the baby car of the test subject 1 and the two baby cars of the test subject 2, abnormality was not found in the examination during and after a test. Moreover, from the test result, the baby car of the test subject 1 had the durability similar to the baby car of the test subject 2.

6-12, the opening shape on the side surface 32 of the user hole 35 is demonstrated. In the example shown in FIG. 6, the triangle in a triangle shape and the shape formed by chamfering one or more edges of a triangle is arrange | positioned in the opposite direction to the example shown in FIGS. That is, the triangle which forms the opening shape on the side surface 32 of the user hole 35 has one side radial direction RD from the center of the tire 30 (in other words, the radial direction of the tire 30). It extends in the direction orthogonal to, and is located on the side surface 32 such that the edges facing the one side are arranged inward in the radial direction RD than the one side. By providing the user hole 35 as well, excellent vibration absorption can be provided to the tire 30 while maintaining the durability of the tire 30 sufficiently.

Moreover, the opening shape in the side surface 32 of the user hole 35 can also be made circular or elliptical. In the example shown in FIG. 7, the opening shape in the side surface 32 of the user hole 35 is circular. When the opening shape in the side surface 32 of the user hole 35 is made into an ellipse shape, the long axis or short axis of the ellipse is the radial direction RD from the center of the tire 30 (in other words, the tire ( 30), and both of the long axis and the short axis of the ellipse may be in the radial direction RD (in other words, the radial direction of the tire 30) from the center 13 of the tire 30. You may make it incline with respect. By providing the user holes 35 as described above, the tire 30 can be provided with excellent vibration absorption while maintaining the durability of the tire 30 sufficiently.

8, the opening shape in the side surface 32 of the user hole 35 may be set to the shape extended in the circumferential direction CD. In the example shown in FIG. 8, the opening shape extends in the circumferential direction CD while maintaining a constant width along the radial direction RD, and the circular shape is formed at both ends in the circumferential direction CD. It has a chamfered shape. In addition, as a modification of the tire 30 shown in FIG. 8, the opening shape may extend in the direction orthogonal to the normal direction RD of the tire 30 instead of the circumferential direction CD of the tire 30. By providing the user hole 35 as well, excellent vibration absorption can be provided to the tire 30 while maintaining the durability of the tire 30 sufficiently.

In the example shown in FIG. 9 and FIG. 10, the opening shape in the side surface 32 of the user hole 35 becomes a trapezoid shape or the shape formed by chamfering one or more edges of a trapezoid shape. 9 and 10, the narrow upper side of the trapezoidal shape is located outside in the radial direction RA from the center of the tire 30 than the wide lower side of the trapezoidal shape. In addition, the upper side and the lower side of the trapezoidal shape extend in the direction orthogonal to the radial direction RA from the center of the tire 30. In addition, in the example shown in FIG. 9 and FIG. 10, the recessed part 41 or the notch 41 is formed in the area | region which becomes the boundary of the ground surface 31 and the side surface 32. As shown in FIG. That is, this recessed part 41 or notch 41 is formed over the ground surface 31 and the side surface 32. The recessed part 41 or the notch 41 is formed in the position which becomes between two adjacent user holes 35 along the circumferential direction CD of the tire 30. Such a tire 30 can also exhibit excellent vibration absorption while maintaining sufficient durability.

In the example shown in FIG. 11 and FIG. 12, the opening shape in the side surface 32 of the user hole 35 becomes rectangular shape, especially an equilateral trapezoid shape. In the example shown to FIG. 11 and FIG. 12, the upper side and the lower side of a trapezoid shape extend in the direction orthogonal to the radial direction RA from the center of the tire 30. As shown in FIG. Moreover, the trapezoidal side surface extends in the radial direction RA from the center of the tire 30. In addition, in the example shown to FIG. 11 and FIG. 12, the recessed part 41 or the notch 41 is formed in the area | region which becomes the boundary of the ground surface 31 and the side surface 32. As shown in FIG. That is, this recessed part 41 or notch 41 is formed over the ground surface 31 and the side surface 32. As shown in FIG. The recessed part 41 or the notch 41 is formed in the position adjacent to the user hole 35 in the radial direction RD from the center of the tire 30, and is connected with the said user hole 35. . Moreover, the circumferential groove 43 extended in the circumferential direction CD of the tire 30 is formed in each side surface 32. As shown in FIG. In the example shown, the circumferential groove 43 extends across the user hole 35. The depth of the groove 43 is shallower than the depth of the user hole 35. Such a tire 30 can also exhibit excellent vibration absorption while maintaining sufficient durability.

In addition, although the opening shape in the side surface 32 of the user hole 35 was demonstrated referring drawings, the above description is an illustration, and the user hole 35 is on the side surface 32, and a different shape, an example, is shown. For example, a polygon shape or a shape formed by chamfering one or more corners of the polygon may be used. In addition, the opening shape of the user hole 35 formed in one side surface 32a may differ from the opening shape of the user hole 35 formed in the other side surface 32b. Moreover, you may make opening shape different between the user holes 35 formed in each side surface.

According to the present embodiment as described above, a plurality of user holes 35 are formed side by side in the circumferential direction CD of the tire 30 on at least one side surface 32 of the tire 30. According to such a tire 30, as demonstrated from the test result mentioned above, while maintaining sufficient durability, it can exhibit the outstanding vibration absorption property. Thereby, the riding comfort of the baby car 10 in which the tire 30 is used can be improved. In addition, by forming the user holes 35 in the tire 30, the weight of the tire 30 can be reduced, and the weight of the baby car 10 including the tire 30 can be realized. In addition, by providing the user holes 35, the design of the tire 30 can be improved.

It is also possible to add various changes to the embodiment described above. Hereinafter, an example of a deformation | transformation is demonstrated.

As an example of the hand cart 5 to which the tire 30 and the wheel 20 are applied, the baby car 10 shown in FIG. 1 was illustrated. The baby car 10 shown in FIG. 1 can be folded so as to be miniaturized in the front-rear direction and the height direction. However, the baby car 10 is not limited to the example of FIG. 1 and, for example, the baby car disclosed in Japanese Patent Application Laid-Open No. 2011-148454, can be further folded after being folded down in the front-back direction, and further downsized in the width direction. ) May be configured. Moreover, the baby car 10 shown in FIG. 1 is comprised so that a handle can rock between a back pushing position (rear position) and a facing pushing position (front position). However, the handle may be fixed to the rear position, and the baby car 10 may be configured so that it cannot be swinged from the back pushing position.

In addition, as described above, the tire 30 and the wheel 20 described above are not limited to the baby car 10 but are, for example, a hand cart as a pet cart used when moving a pet ( 5) and the hand cart 5 as a trolley used for carrying goods.

Claims (12)

In the handcar tire,
With a ground plane and a pair of sides,
A tire in which a plurality of user holes are formed side by side in the circumferential direction of the tire on at least one side surface. The method of claim 1,
The user hole is formed in both of one side and the other side,
An arrangement of the user holes formed on the one side surface is a tire shifted from the arrangement of the user holes formed on the other side surface in the circumferential direction of the tire. The method of claim 1,
The user hole is formed in both of one side and the other side,
The inclination angle of the wall surface of the user hole formed in the said one side surface is different from the inclination angle of the wall surface of the user hole formed in the said other side surface. The method of claim 1,
A tire having ribs extending around the user hole formed on the side surface. The method of claim 1,
The said user hole is a tire which has a symmetrical shape centering on the axis extended in the radial direction from the center axis line of a tire. The method of claim 1,
The opening shape in the said side surface of the said user hole is a shape formed by chamfering one or more edges of a triangle shape or a triangle. The method according to claim 6,
The triangle in the triangular shape and the shape formed by chamfering one or more corners of the triangle has one edge extending in a direction orthogonal to the radial direction from the center axis of the tire, and the edge opposite to the one side is A tire located on the side surface such that the tire is disposed outside the one side in the radial direction. The method of claim 1,
The tire shape of which the opening shape in the said side surface of the said user hole is circular shape or elliptical shape. The method of claim 1,
The tire shape of which the opening shape in the said side surface of the said user hole extends in a circumferential direction. The tire according to claim 1,
Wheel for a hand cart having a wheel for holding the tire. A hand cart comprising the wheel according to claim 10. The baby carriage provided with the wheel of Claim 10.

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