JP3146226U - Tire changing jig - Google Patents

Abstract

The present invention provides a tire replacement jig that facilitates manual removal of a tire and can reduce costs.
A support projection 13 is provided on a planar base portion 11 placed on a work floor 9 to support the vicinity of a bead 21 of a tire 5 over the entire circumference. A recess 19 is formed in the center by the support protrusion 13 over the entire circumference, and the wheel 7 of the wheel 3 is positioned. The depth of the recess 19 is such that the bead 21 of the tire 5 is pressed by the support protrusion 13 from below with the wheel 7 of the wheel 3 positioned in the recess 19 pressed from above and in contact with the bottom of the recess 19. It is set as the depth which one side approaches to the other side of the bead 21 at a moderate space | interval. The support protrusions 13 are separated into a plurality of parts in the circumferential direction to form separation protrusions 15 and have a predetermined distance from each other. The upper part 23 of the support protrusion 13 is inclined so that one of the beads 21 of the tire 5 pressed against the support protrusion 13 from below is in surface contact.
[Selection] Figure 1

Description

  The present invention relates to a tire replacement jig used for facilitating the removal work when, for example, a tire constituting a motorcycle wheel is removed from the wheel and replaced.

  As shown in FIG. 6, for example, a motorcycle wheel 101 is tubeless, and the wheel 101 includes a tire 103 and a wheel 105 that holds the tire 103. One side of the cross section of the tire 103 has a substantially U shape, and both end portions of the substantially U shape are called beads 107. One side of the cross section of the wheel 105 has a shallow U shape that faces the substantially U shape of the tire 103, and both ends of the shallow U shape are called rims 109. The beads 107 that are both U-shaped tip portions are sandwiched and held inside the rim 109 that is both shallow U-shaped tip portions. The compressed air is injected into the internal space 111 formed thereby, and the wheel 101 is configured. Since the inner periphery of the bead 107 is reinforced by a bead wire (not shown) inside and is slightly shorter than the outer periphery of the rim 109, stable holding is performed.

  When the tire 103 is worn out and needs to be replaced, the old tire 103 must be removed from the wheel 105 that holds the tire 103. When this removal work is performed manually, the wheel 101 is evacuated on the work floor, and a metal lever 113 called a tire lever is inserted between the bead 107 and the rim 109 so as to open it (arrow in the figure). A) The inner periphery of the bead 107 is expanded, and slightly larger than the outer periphery of the rim 109 is instantaneously removed.

In patent document 1, the machine which removes a tire from a wheel is indicated. While crushing the approximate U-shape of the tire with the hydraulic cylinder, this inserts a protrusion into the gap created between the bead and the rim, widens the inner circumference of the bead and makes it slightly larger than the outer circumference of the rim. ,remove.
JP 10-086617 A

However, when the work of removing the tire is performed manually as shown in FIG. 6, not only the force of the inner periphery of the spread bead is shrunk, but both the front ends of the substantially U shape of the tire 103 are about to spread each other. Force (up-down direction force (arrow B) in the figure) works and is difficult to remove.
In Patent Document 1, a large-scale device such as a hydraulic cylinder is required, and the cost of the device increases.
In order to solve the above-described problems, an object of the present invention is to provide a tire replacement jig that can easily perform a work of removing a tire by hand and can reduce costs.

  In order to solve the above problems, the first device is a tire replacement jig used for removing a wheel tire when the tire is removed from the wheel, and is a planar base portion placed on the work floor. And a support projection that protrudes on the base portion and supports the vicinity of the bead of the tire over the entire circumference, and a recess that is formed in the center by the support projection over the entire circumference and in which the wheel of the wheel can be located. The depth of the recess is one of the bead of the tire pressed from below on the support protrusion in a state where the wheel of the wheel positioned in the recess is pressed from above and is in contact with the bottom of the recess. Is a tire replacement jig characterized in that it has a depth approaching the appropriate distance to the other of the beads.

  According to a second aspect of the present invention, the support protrusion is separated into a plurality of circumferential protrusions to form a separation protrusion, and has a predetermined distance from each other, and the upper portion of the support protrusion is pressed by the support protrusion from below. A tire replacement jig characterized in that one of the beads is inclined so as to be in surface contact.

  According to the tire replacement jig of the first or second device, the wheel is positioned horizontally in the recess formed in the center by the supporting protrusions extending over the entire circumference. And when the wheel of a wheel is pushed by the operator getting on from the top etc., the substantially U character of a tire is crushed. In this crushed state, a lever is inserted between the bead and the rim from above, and the inner periphery of the bead is widened by pulling it open, and then slightly larger than the outer periphery of the rim, and then removed.

Therefore, since the substantially U-shape of the tire is crushed and both ends of the substantially U-shape of the tire can hold down the force to spread each other, it is easy to remove the tire. In addition, this jig has a simple shape and can be manufactured at low cost.
Further, according to the second device, the support protrusions are separated into a plurality of circumferential protrusions to form separation protrusions and have a predetermined distance from each other. If the lever is inserted from above at this distance, the support protrusion is supported directly below. Since there is no protrusion, the crushing force is weak and the lever is easy to insert.
Also, the upper part of the support protrusion is inclined, and when the tip of this inclination is pushed, the vicinity of the bead of the tire is pushed with a strong local force, and both tip parts of the substantially U shape of the tire are easily crushed so as to approach each other. . Therefore, it is possible to easily suppress the force at which both the tip portions of the substantially U-shape are to spread each other. Then, after the substantially U-shape is crushed, the tire bead is in surface contact with the upper portion of the support protrusion, so that the tire is stabilized.

A tire replacement jig according to an embodiment of the present invention is shown in FIGS.
The tire changing jig 1 is a jig 1 used for manually removing the tire 3 of the wheel 3 from the wheel 7 for replacement.
As shown in FIGS. 1 and 2, a support protrusion 13 is provided on a planar base portion 11 placed on the work floor 9 to support the vicinity of the bead 21 of the tire 5 over the entire circumference. As shown in FIG. 2, the support protrusions 13 are separated into six in the circumferential direction to form separation protrusions 15, and have a predetermined distance 17 from each other.
A recess 19 is formed in the center by the support protrusion 13 over the entire circumference, and the wheel 7 of the wheel 3 is positioned. The depth of the recess 19 is such that the bead of the tire 5 is pressed by the support protrusion 13 from below with the wheel 7 of the wheel 3 positioned in the recess 19 pressed from above and in contact with the bottom 19A of the recess 19. The depth is such that one of the 21 approaches the other of the beads 21 with an appropriate distance 21A.

The upper part 23 of each separation protrusion 15 constituting the support protrusion 13 is inclined with a high inside and a low outside. Due to this inclination, one of the beads 21 of the tire 5 pushed from below by the support protrusion 13 is inclined and comes into surface contact with the upper portion 23.
"Effects of Embodiment"
According to this embodiment, the tire 5 is removed by the following procedure.
As shown in FIG. 3, first, the wheel 3 is positioned horizontally on the recess 19 formed in the center of the tire changing jig 1. In this state, the inclined tip 25 of the support protrusion 13 locally supports the vicinity of the bead 21 of the tire 5.
As shown in FIG. 4, when the wheel 7 of the wheel 3 is pushed by an operator from above (arrow C in the figure), the substantially U-shape of the tire 5 is crushed. At this time, the vicinity of the bead 21 of the tire 5 is pushed with a strong local force by the inclined tip 25 of the support protrusion 13, and both tip portions of the substantially U-shape of the tire 5 come closer to each other and are easily crushed. Therefore, the force (arrow B in FIG. 6) that the both end portions of the substantially U-shape are to spread can be easily suppressed.

  Next, as shown in FIG. 1, in this collapsed state, a lever is inserted between the bead 21 and the rim 22 from above. At this time, the support protrusion 13 is divided into a plurality of separation protrusions 15 in the circumferential direction, and has a predetermined interval 17 (FIG. 2). Therefore, if the lever 27 is inserted from above at the interval 17 portion, Since the separation protrusion 15 does not exist, the force with which the rim 22 of the wheel 7 pushes the bead 21 of the tire 5 is weak, and the lever 27 can be easily inserted between the bead 21 and the rim 22. Then, the inner periphery of the bead 21 is widened by lever 27 so as to pry open (arrow D in FIG. 1).

During the operation of expanding the inner periphery of the bead 21, the substantially U-shape of the tire 5 is further crushed and the bead 21 of the tire 5 is in surface contact with the upper portion 23 of the support protrusion 13, so that the tire 5 is stabilized.
As shown in FIG. 5, the tire 5 is detached when the inner circumference of the bead 21 becomes slightly larger than the outer circumference of the rim 22 instantaneously.

  As described above, the substantially U-shape of the tire 5 is crushed, and both ends of the substantially U-shaped portion of the tire 5 can hold down the force to spread each other, so that the tire 5 can be easily removed. In addition, this jig has a simple shape and can be manufactured at low cost.

It is sectional drawing which shows the 3rd process of the operation | work which removes a tire from a wheel with the jig | tool for tire replacement which concerns on one Embodiment of this invention. It is a perspective view of the jig | tool for tire replacement | exchange of FIG. It is sectional drawing which shows the 1st process prior to the process of FIG. It is sectional drawing which shows the 2nd process prior to the process of FIG. It is sectional drawing which shows the 4th process following the process of FIG. It is sectional drawing which shows the operation | work which removes a tire from a wheel by the conventional manual operation.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tire replacement jig | tool, 3 ... Wheel, 5 ... Tire, 7 ... Wheel, 9 ... Work floor, 11 ... Base part, 13 ... Supporting protrusion, 15 ... Separation protrusion, 17 ... Space | interval, 19 ... Recessed part, 21 ... A bead, 22 ... rim, 23 ... upper part, 25 ... tip, 27 ... lever, 101 ... wheel, 103 ... tire, 105 ... wheel, 107 ... bead, 109 ... rim, 111 ... inner space, 113 ... lever.

Claims (2)

  A tire replacement jig used to remove a wheel tire from the wheel for replacement, and a flat base portion placed on a work floor, and a protruding base on the base portion. A support protrusion for supporting the vicinity of the bead over the entire circumference, and a recess formed in the center by the support protrusion over the entire circumference and in which the wheel of the wheel can be located. The depth of the recess is located in the recess. In a state where the wheel of the wheel that has been pressed is pressed from above and is in contact with the bottom of the recess, one of the tire beads pressed from below by the support protrusion has a depth that approaches the other of the beads at an appropriate interval. A tire replacement jig characterized by that.   The support protrusions are separated into a plurality of circumferential protrusions to form separation protrusions, and have a predetermined distance from each other. The upper part of the support protrusion is one surface of one of the tire beads pressed from below by the support protrusion. The tire replacement jig according to claim 1, wherein the tire replacement jig is inclined so as to be in contact with the tire.

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