Fixture

Abstract

To provide a jig that can reduce a time and effort required to attach a ring member to a bead lock.SOLUTION: A jig 1 for radial expansion and contraction of a circular ring member 10 made of elastic material includes: a plurality of segments 2; a plurality of supports 5, each of which supports the plurality of segments 2 displaceably in a radial direction between a first position P1 on a first circle Q1 whose diameter is smaller than an inner diameter of the ring member 10 and a second position P2 on a second circle Q2 whose diameter is concentric with the first circle Q1 and larger than the inner diameter of the ring member 10; and a link mechanism 3 that links the plurality of supports 5 and positions the plurality of segments 2 on the same circumference.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a jig.

Background Art

[0002] Some raw tire forming apparatuses include a former for forming a cylindrical material, a bead set ring for holding a bead, and a ring-shaped bead lock for fixing the bead to the cylindrical material (for example, Patent Document 1 below).

[0003] The bead lock has a plurality of ring segments that can expand and contract in diameter. When fixing the bead to the bead lock, a ring member made of an elastic material such as urethane is disposed between the bead and the bead lock. The ring member prevents the bead and the bead lock (ring segment) from coming into direct contact, and suppresses damage to the bead when the diameter of each ring segment expands and contracts.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The ring member attached to the bead lock needs to be replaced according to the specifications of the tire to be manufactured. Therefore, when using a green tire molding device, an operation of attaching the ring member to the bead lock occurs. Conventionally, this operation of attaching the ring member has been performed manually by a plurality of workers. Specifically, in the operation of attaching the ring member, a plurality of workers work together using tools such as bars to expand the diameter of the ring member to a size that can be externally fitted to the bead lock. When the diameter of the ring member is expanded manually, it is difficult to uniformly expand the ring member in the circumferential direction, and it is necessary for a plurality of workers to work together. For this reason, conventionally, a great deal of labor has been required for the operation of attaching the ring member.

[0006] The present invention has been made in view of such a situation, and an object thereof is to provide a jig that can reduce the labor required for the operation of attaching a ring member to a bead lock.

Means for Solving the Problems

[0007] A jig according to one aspect of the present invention is a jig for expanding the diameter of an annular ring member made of an elastic material in the radial direction, the jig including a plurality of segments capable of contacting the inner circumference of the ring member, a first position on a first circle having a diameter smaller than the inner diameter of the ring member, and a second position on a second circle concentric with the first circle and having a diameter larger than the inner diameter of the ring member, a plurality of support portions respectively supporting the plurality of segments so as to be displaceable in the radial direction, and a link mechanism that links the plurality of support portions and positions the plurality of segments on the same circumference.

[0008] Preferably, the segments in this jig are arranged evenly in the circumferential direction.

[0009] Preferably, the segments in this jig have a curved contact surface that contacts the inner circumference of the ring member.

[0010] Preferably, this jig further includes an annular main body frame, the main body frame having a plurality of support shafts that are parallel to the axial direction of the main body frame and are provided at intervals in the circumferential direction, the support portion swingably supporting the segment and having a support plate that is swingably supported with respect to the support shaft so that the segment is displaced within a range where the segment is located at the first position and the second position, and the link mechanism having a plurality of connection members that connect the support plates of the support portions adjacent to each other in the circumferential direction.

[0011] Preferably, the main body frame of this jig has a latching portion capable of hooking a hook.

Advantages of the Invention

[0012] According to the jig of the present invention, the labor required for the work of attaching the ring member to the bead lock can be reduced.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0014] [Ring member] The target member to which the jig 1 of this embodiment is applied is the ring member 10 shown in the upper figure of FIG. 7. The ring member 10 is an annular member made of a stretchable material and has an inner hole 11. The ring member 10 of this embodiment is made of urethane. The ring member 10 is a member to be attached to the bead lock 12 that constitutes a part of the green tire forming apparatus. In a state where the diameter is not expanded, the diameter of the inner hole 11 is diameter D0. The diameter (outer diameter) of the bead lock 12 shown in this embodiment is diameter D3, and the diameter D3 is larger than the diameter D1 of the inner hole 11 (D3>D1).

[0015] [Overall Configuration of the Jig] FIGS. 1 and 2 show a jig 1 which is a jig according to an embodiment of the present invention. The jig 1 shown in FIGS. 1 and 2 is a jig for expanding the diameter of the ring member 10 (see FIG. 7), and includes a plurality of segments 2, a link mechanism 3, and an annular main body frame 4. In this description, the direction of the central axis C of the main body frame 4 (see FIG. 2) is defined as the axial direction of the jig 1, and the direction orthogonal to the axial direction is defined as the radial direction of the jig 1.

[0016] [Segment] The segment 2 shown in FIGS. 1 and 2 constitutes a portion of the jig 1 where the ring member 10 (see FIG. 7) is attached. The segment 2 includes a base portion 20 and a contact portion 21. The base portion 20 is constituted by a metal plate and has a shape that is arcuate in the axial view of the jig 1. The contact portion 21 is a portion that protrudes axially from the base portion 20 along the arcuate shape of the base portion 20. In the segment 2, the convex curved surface formed on the outer side in the radial direction of the contact portion 21 is used as the contact surface 21a that contacts the ring member 10. The contact surface 21a has an arcuate shape along the inner peripheral shape of the inner hole 11 of the ring member 10 and makes surface contact with the inner peripheral portion of the inner hole 11.

[0017] A shaft hole 20a is formed in the base portion 20. The shaft portions 51d and 52d of the support plate 50 described later are inserted into the shaft hole 20a. Then, the segment 2 is supported by the shaft portions 51d and 52d so as to be swingable with respect to the support plate 50.

[0018] As shown in FIG. 1, in the jig 1, each segment 2 is arranged on the same circumference. In this embodiment, the jig 1 having six segments 2 is illustrated, but the number of segments 2 in the jig 1 is not limited to this, and may be two or more.

[0019] [Link mechanism] The link mechanism 3 shown in FIG. 1 is a mechanism for displacing a plurality of segments 2 arranged on the same circumference in the radial direction while positioning them on the same circumference, and includes a plurality of support portions 5 and a plurality of connection members 6. Further, the main body frame 4 that constitutes the skeleton of the jig 1 also constitutes a part of the link mechanism 3.

[0020] [Main body frame] FIG. 3 shows the form of the main body frame 4 alone. The main body frame 4 shown in FIG. 3 is composed of an annular plate material. The main body frame 4 of this embodiment is made of metal. A plurality of support shafts 40 protruding to one side in the axial direction are provided on the main body frame 4. The support shafts 40 are arranged at equal intervals in the circumferential direction on the same circumference centered on the axis of the center line C of the jig 1. In the main body frame 4 of this embodiment, six support shafts 40 are provided at positions where the angles are different by 60° each in the circumferential direction on the same circumference.

[0021] A latching portion 41 capable of hooking a hook is provided on the main body frame 4. The latching portion 41 of this embodiment is constituted by a round ring (eye bolt) protruding radially outward from the main body frame 4. Further, a stay 42 for arranging an operation portion 7 to be described later is provided on the main body frame 4. The stay 42 protrudes radially outward from the main body frame 4.

[0022] [Support portion] As shown in FIG. 1, the jig 1 includes six sets of support portions 5. The support portion 5 is a portion that supports the segment 2 so as to be displaceable in the radial direction. In this description, the six sets of support portions 5 in the jig 1 are respectively referred to as the first support portion 5A, the second support portion 5B, the third support portion 5C, the fourth support portion 5D, the fifth support portion 5E, and the sixth support portion 5F and distinguished according to their circumferential arrangement positions. In addition, when simply referring to the "support portion 5" in the following description, the configuration common to each of the support portions 5A to 5F is described without considering the arrangement position of the support portion 5.

[0023] As shown in FIGS. 1 and 2, the support portion 5 includes a support plate 50. The support plate 50 is swingably supported by a support shaft 40.

[0024] [Support plate] As shown in FIG. 1, each support plate 50 constituting the jig 1 includes a first plate 51 and a second plate 52 having different shapes. In the jig 1, only the sixth support portion 5F has the second plate 52, and the other five support portions 5A to 5E have the first plate 51.

[0025] The first plate 51 is a member having a substantially L-shaped form in the axial view of the jig 1, and a shaft hole 51a is formed near the valley portion of the substantially L shape. The first plate 51 is swingably supported with respect to the main body frame 4 by inserting the support shaft 40 into the shaft hole 51a. In addition, the first plate 51 has a first arm portion 51b extending radially inward from the shaft hole 51a and a substantially fan-shaped second arm portion 51c extending radially outward from the shaft hole 51a.

[0026] A shaft portion 51d is provided at the radially inner end of the first arm portion 51b. The shaft portion 51d is inserted into the shaft hole 20a of the segment 2 and swingably supports the segment 2. The shaft portion 51d is displaced with a radial movement as the first plate 51 rotates around the support shaft 40.

[0027] On the second wrist part 51c, a pair of shaft parts 51e and 51f are provided at one side and the other side ends in the circumferential direction on the radially outer side. Each of the shaft parts 51e and 51f is displaced with movement in the circumferential direction when the first plate 51 rotates around the support shaft 40. Each of the shaft parts 51e and 51f swingably supports a connection member 6, which will be described later.

[0028] The second plate 52 is a member having a substantially V-shaped form in the axial direction view of the jig 1, and a shaft hole 52a is formed near the valley part of the substantially V shape. The second plate 52 has the support shaft 40 inserted into the shaft hole 52a and is swingably supported with respect to the main body frame 4. Further, the second plate 52 has a first wrist part 52b extending radially inward from the shaft hole 52a and a second wrist part 52c extending radially outward from the shaft hole 52a.

[0029] A shaft part 52d is provided at the radially inner end of the first wrist part 52b. The shaft part 52d is inserted into the shaft hole 20a of the segment 2 and swingably supports the segment 2. The shaft part 52d is displaced with movement in the radial direction when the second plate 52 rotates around the support shaft 40.

[0030] Also, a shaft part 52e is provided at the radially outer end of the second wrist part 52c. The shaft part 52e swingably supports the connection member 6, which will be described later. The shaft part 52e is displaced with movement in the circumferential direction when the second plate 52 rotates around the support shaft 40.

[0031] Each of the support plates 50 (the first plate 51 and the second plate 52) described above converts the displacement in the circumferential direction of the second wrist parts 51c and 52c into the displacement in the radial direction of the first wrist parts 51b and 52b by swinging around the support shaft 40.

[0032] [Connection member] As shown in FIG. 1, the connection member 6 is a member that connects two adjacent support plates 50 and 50 in the circumferential direction. The connection member 6 has a rod-shaped main body part 6a and a pair of shaft holes 6b and 6b formed at both ends of the main body part 6a.

[0033] The first support portion 5A and the second support portion 5B adjacent to each other in the circumferential direction are connected by a connecting member 6 and constitute a part of the link mechanism 3. Specifically, in the connecting member 6, the shaft portion 51f of the first support portion 5A is inserted into the shaft hole 6b on one side, and the shaft portion 51e of the second support portion 5B is inserted into the shaft hole 6b on the other side, thereby connecting the respective support plates 50 (first plate 51) of the first support portion 5A and the second support portion 5B.

[0034] Also, the second support portion 5B and the third support portion 5C adjacent to each other in the circumferential direction are connected by a connecting member 6 and constitute a part of the link mechanism 3. Specifically, in the connecting member 6, the shaft portion 51f of the second support portion 5B is inserted into the shaft hole 6b on one side, and the shaft portion 51e of the third support portion 5C is inserted into the shaft hole 6b on the other side, thereby connecting the respective support plates 50 (first plate 51) of the second support portion 5B and the third support portion 5C.

[0035] Also, the third support portion 5C and the fourth support portion 5D adjacent to each other in the circumferential direction are connected by a connecting member 6 and constitute a part of the link mechanism 3. Specifically, in the connecting member 6, the shaft portion 51f of the third support portion 5C is inserted into the shaft hole 6b on one side, and the shaft portion 51e of the fourth support portion 5D is inserted into the shaft hole 6b on the other side, thereby connecting the respective support plates 50 (first plate 51) of the third support portion 5C and the fourth support portion 5D.

[0036] Also, the fourth support portion 5D and the fifth support portion 5E adjacent to each other in the circumferential direction are connected by a connecting member 6 and constitute a part of the link mechanism 3. Specifically, in the connecting member 6, the shaft portion 51f of the fourth support portion 5D is inserted into the shaft hole 6b on one side, and the shaft portion 51e of the fifth support portion 5E is inserted into the shaft hole 6b on the other side, thereby connecting the respective support plates 50 (first plate 51) of the fourth support portion 5D and the fifth support portion 5E.

[0037] Further, the fifth support portion 5E and the sixth support portion 5F adjacent to each other in the circumferential direction are connected by a connecting member 6 to constitute a part of the link mechanism 3. Specifically, in the connecting member 6, the shaft portion 51f of the fifth support portion 5E is inserted into the shaft hole 6b on one side, and the shaft portion 52e of the sixth support portion 5F is inserted into the shaft hole 6b on the other side, thereby connecting the respective support plates 50 (the first plate 51 and the second plate 52) of the fifth support portion 5E and the sixth support portion 5F.

[0038] In the jig 1, a series of link mechanisms 3 having a substantially annular shape are constituted by connecting the respective support plates 50, 50 adjacent to each other in the circumferential direction from the first support portion 5A to the sixth support portion 5F with the connecting member 6. In the link mechanism 3, the sixth support portion 5F and the first support portion 5A are adjacent to each other but not connected by the connecting member 6. An operation portion 7 of the link mechanism 3 described later is connected to the first support portion 5A.

[0039] [Link mechanism] In the jig 1 shown in FIG. 1, the two support plates 50, 50 connected by the main body frame 4 and the connecting member 6 have the same distance from the axis center of the support shaft 40 to the respective shaft portions 51d, 52d, and the length of the connecting member 6 is also the same. For this reason, the two support plates 50, 50 connected by the connecting member 6 constitute a "one-degree-of-freedom lever crank mechanism" in which when one support plate 50 swings around the support shaft 40, the other support plate 50 makes a determined movement.

[0040] In the link mechanism 3, when any one support plate 50 swings around the support shaft 40, the other (five) support plates 50 connected to each other by the connecting member 6 are swung around the support shaft 40 at the same angle. For this reason, in the jig 1, the radial positions of the shaft portions 51d, 52d of the respective support plates 50 can always be aligned (that is, positioned on the same circumferential shape), and thereby, the radial positions of the respective segments 2 supported by the respective support plates 50 can be aligned.

[0041] As described above, in the jig 1, the link mechanism 3 can displace the plurality of segments 2 in the radial direction while positioning them in the same circumferential shape.

[0042] [Operation part] As shown in FIGS. 1 and 4, the jig 1 includes an operation part 7. The operation part 7 is a part for an operator to operate the link mechanism 3. In the operation part 7 of the present embodiment, the support plate 50 of the first support part 5A can be swung by the operation of the operator. Note that the operation part 7 in the jig 1 of the present embodiment may be configured to be able to swing the support plates 50 of each of the support parts 5 other than the first support part 5A.

[0043] The operation part 7 includes a rod-shaped main body part 70. A shaft hole 71 is formed at one end of the main body part 70. Further, a screw part 74 that can screw the first nut 72 and the second nut 73 is formed at the other end of the main body part 70.

[0044] The main body frame 4 is provided with a support member 43 for guiding the main body part 70. A shaft hole 43a into which the main body part 70 can be inserted is formed in the support member 43. The support member 43 is supported by a rotating shaft 42a provided on the stay 42 and is rotatable around the rotating shaft 42a with respect to the main body frame 4. The main body part 70 is inserted into the shaft hole 43a and is displaceable in the axial direction of the shaft hole 43a.

[0045] The main body part 70 is inserted into the shaft hole 43a of the support member 43 up to the position where the screw part 74 exists. Then, the first nut 72 is arranged at the end of the support member 43 on one side in the axial direction, and the second nut 73 is arranged at the end on the other side in the axial direction, on the screw part 74 inserted into the shaft hole 43a. That is, the support member 43 is in a state of being sandwiched by the nuts 72 and 73. With such a configuration, by changing the screwing position of the first nut 72 and the second nut 73, the position of the main body part 70 with respect to the support member 43 in the axial direction of the shaft hole 43a can be changed.

[0046] The shaft portion 51e of the first support portion 5A is inserted into the shaft hole 71. Thereby, the operation portion 7 is connected to the first support portion 5A. In the jig 1, by changing the length of the main body portion 70 of the portion located between the support member 43 and the first support portion 5 in the operation portion 7, the support plate 50 of the first support portion 5A can be swung.

[0047] Specifically, in the jig 1, an operator tightens or loosens the first nut 72 and the second nut 73 of the operation portion 7 to change the screwing positions of the respective nuts 72, 73 with respect to the screw portion 74. Thereby, the length of the main body portion 70 of the portion located between the support member 43 and the first support portion 5 is changed, and the support plate 50 of the first support portion 5A is swung. Then, each segment 2 connected by the link mechanism 3 is displaced in the radial direction of the jig 1.

[0048] [Displacement of Segment] The left figure of FIG. 5 shows the jig 1 in a state where each segment 2 is displaced to the first position P1 which is the most radially inner side. Each segment 2 located at the first position P1 has the contact surface 21a located on the first circle Q1 when viewed from the axial direction. The diameter D1 of the first circle Q1 at this time is a dimension equal to or less than the diameter D0 of the inner hole 11 of the ring member 10 (D1≦D0).

[0049] The right figure of FIG. 5 shows the jig 1 in a state where each segment 2 is displaced to the second position P2 which is the most radially outer side. Each segment 2 located at the second position P2 has the central position (the apex of the contact surface 21a) in the circumferential direction of the contact surface 21a in contact with the second circle Q2 when viewed from the axial direction. The diameter D2 of the second circle Q2 at this time is a dimension larger than the diameter D0 of the inner hole 11 of the ring member 10 (D2>D0).

[0050] In this way, in the jig 1, each support plate 50 is made swingable around each support shaft 40 so that each segment 2 provided on each of the first arm portions 51b, 52b is displaced within a range between the first position P1 on the radially inner side and the second position P2 on the radially outer side.

[0051] As described above, the jig 1 includes an annular main body frame 4. The main body frame 4 has a plurality of support shafts 40 that are parallel to the axial direction of the main body frame 4 and are provided at intervals in the circumferential direction. The support portion 5 swingably supports the segment 2 and has a support plate 50 that is swingably supported with respect to the support shaft 40 so that the segment 2 is displaced within a range between the first position P1 and the second position P2. The link mechanism 3 has a plurality of connection members 6 that connect the support plates 50, 50 of the adjacent support portions 5, 5 in the circumferential direction. With such a configuration, the link mechanism 3 can displace a plurality of segments 2 in the radial direction, and a jig 1 capable of uniformly expanding the diameter of the ring member 10 in the circumferential direction can be configured.

[0052] When the diameter of the ring member 10 is expanded using such a jig 1, the ring member 10 is arranged with respect to the jig 1 in a state where each segment 2 is located at the first position P1 and the contact surface 21a is located on the first circle Q1 in the axial view, so that the contact surface 21a of each segment 2 is applied to the inner hole 11. In this state, the inner hole 11 of the ring member 10 has a diameter D1. The diameter D1 at this time is approximately equal to the diameter D0 of the inner hole 11 of the ring member 10 in a state where the ring member 10 has not been expanded (D0 ≒ D1). Then, by operating the operation unit 7 and displacing each segment 2 to the second position P2, the ring member 10 can be expanded to a state where the inner diameter 11 has a diameter D2. In the jig 1 in this state, the center in the circumferential direction of the contact surface 21a in the axial view is in contact with the second circle Q2.

[0053] The diameter D2 of the second circle Q2 is larger than the diameter D3 of the bead lock 12 (D2 > D3), and the bead lock 12 can be inserted into the inner hole 11 in a state where the inner hole 11 is expanded to a diameter D2.

[0054] In addition, since each segment 2 displaced to the second position P2 is evenly arranged in the circumferential direction and the center in the circumferential direction of the contact surface 21a in the axial view is in contact with the second circle Q2, the ring member 10 can be uniformly expanded in the circumferential direction.

[0055] In this way, in jig 1, segments 2 are evenly arranged in the circumferential direction. Therefore, by using jig 1, the ring member 10 can be uniformly expanded in the circumferential direction. When jig 1 is used, after the ring member 10 is expanded, the shape of the inner hole 11 remains circular, and it becomes easier to insert the bead lock 12 into the inner hole 11. Further, since the segment 2 in jig 1 has a curved contact surface 21a that contacts the inner circumference of the ring member 10, the pressing force of the segment 2 does not act concentratedly at one point on the inner circumferential portion of the inner hole 11, and even after the ring member 10 is uniformly expanded, the inner hole 11 is reliably maintained substantially circular.

[0056] [Method of using the jig] Here, the method of using jig 1 when expanding the ring member 10 using jig 1 shown in FIG. 1 and attaching the ring member 10 to the bead lock 12 shown in FIG. 7 will be described.

[0057] First, as shown in the left figures of FIGS. 5 and 6, the screwing positions of the first nut 72 and the second nut 73 of the operation portion 7 are changed, and each segment 2 is arranged at the first position P1. In this state, the contact surface 21a of each segment 2 is located on the first circle Q1 in the axial view. Then, the operator arranges the ring member 10 with respect to the jig 1 in this state. Specifically, the ring member 10 is attached to the jig 1 such that the inner circumference of the inner hole 11 is applied to the contact surface 21a of each segment 2. At this time, the diameter of the inner hole 11 of the ring member 10 is a diameter D1 that is substantially equal to the diameter D0. The work of attaching this ring member 10 to the jig 1 can be performed by one operator.

[0058] Next, as shown in the right diagrams of FIGS. 5 and 6, the screwing positions of the first nut 72 and the second nut 73 of the operation unit 7 are changed, and each segment 2 is displaced to the second position P2. In this state, the contact surface 21a of each segment 2 is in contact with the second circle Q2 at the center in the circumferential direction in the axial view. And when each segment 2 is displaced, each contact surface 21a presses the inner peripheral portion of the inner hole 11 radially outward. That is, in the jig 1, the segment 2 is displaced radially outward, and the inner peripheral surface of the inner hole 11 is pressed radially outward by the contact surface 21a to expand the diameter of the ring member 10. At this time, the diameter of the inner hole 11 of the ring member 10 is a diameter D2 larger than the diameter D3 of the bead lock 12.

[0059] Each segment 2 is swingably supported with respect to the shaft portions 51d, 52d of each support plate 50. For this reason, as each support plate 50 swings in the diameter-expanding direction and the angles of the first arm portions 51b, 52b change around the support shaft 40, each segment 2 swings around the shaft portions 51d, 52d so that each contact surface 21a follows the inner peripheral shape of the inner hole 11. Thereby, the direction in which each segment 2 presses the inner peripheral portion of the inner hole 11 can be surely made radially outward.

[0060] The operation of changing the screwing positions of the first nut 72 and the second nut 73 of the operation unit 7 can be performed using a power tool such as an electric wrench, for example. For this reason, in the work of mounting the ring member 10 using the jig 1, in the work of expanding the diameter of the ring member 10, it is not necessary for a plurality of workers to work together using tools such as a bar, and only one worker needs to tighten the first nut 72 using a power tool. That is, by performing the work of expanding the diameter of the ring member 10 using the jig 1, the burden on the worker can be reduced.

[0061] Next, hook the suspension hook of equipment such as a hoist onto the hanging portion 41 of the jig 1 and lift it, and transport it to the position where the ring member 10 is to be mounted (the bead lock 12 (see FIG. 7) in this embodiment). Then, insert the bead lock 12 into the inner hole 11 of the ring member 10 in the expanded diameter state. Note that the suspension hook of equipment such as a hoist may be hooked onto the hanging portion 41 of the jig 1 in advance before the start of the operation, and the mounting operation of the ring member 10 may be performed with the jig 1 lifted by equipment such as a hoist.

[0062] As described above, the main body frame 4 of the jig 1 has a hanging portion 41 on which a hook can be hooked. According to the jig 1 having such a configuration, the jig 1 can be lifted using a hoist or the like and easily moved to a desired position. Therefore, the work of transporting the jig 1 to the bead lock 12 can be easily performed with a minimum number of people.

[0063] Next, as shown in the left diagrams of FIGS. 5 and 6, change the screwing positions of the first nut 72 and the second nut 73 of the operation unit 7 to swing each support plate 50 in the diameter-reducing direction, and displace each segment 2 to the first position P1. At this time, each segment 2 is arranged at a position where each contact surface 21a is located on the first circle Q1 in the axial direction view. Also at this time, the inner hole 11 is reduced in diameter so as to approach the diameter D0, and the ring member 10 is fitted onto the outer periphery of the bead lock 12. Then, after the ring member 10 is mounted on the outer periphery of the bead lock 12, the jig 1 is removed from the inner hole 11. The work of removing the jig 1 from the ring member 10 can be performed by one operator. Thus, the mounting work of the ring member 10 to the bead lock 12 is completed.

[0064] Note that if the procedure reverse to the mounting procedure of the ring member 10 described above is followed, it is also possible to remove the ring member 10 mounted on the bead lock 12 using the jig 1.

[0065] As described above, the jig 1 is a jig for expanding and contracting the diameter of an annular ring member 10 made of an elastic material in the radial direction. The jig 1 includes a plurality of segments 2, a first position P1 on a first circle Q1 having a diameter smaller than the inner diameter of the ring member 10, and a second position P2 on a second circle Q2 that is concentric with the first circle Q1 and has a diameter larger than the inner diameter of the ring member 10. The jig 1 further includes a plurality of support portions 5 that respectively support the plurality of segments 2 so as to be displaceable in the radial direction, and a link mechanism 3 that links the plurality of support portions 5 and positions the plurality of segments 2 on the same circumference.

[0066] According to the jig 1 having such a configuration, the labor required for the work of attaching the ring member 10 to the bead lock 12 can be reduced. Further, by using the jig 1, it is possible to perform the work of attaching the ring member 10 with a minimum number of people.

[0067] The embodiments disclosed above are illustrative in all respects and not restrictive. That is, the jig of the present invention may be in other forms within the scope of the present invention, not limited to the illustrated form.

Industrial Applicability

[0068] The jig described above is applicable not only to the use of expanding the diameter of a ring member attached to a bead lock related to a tire manufacturing apparatus, but also to the use of expanding the diameter of a ring-shaped member made of an elastic material used for other purposes.

Explanation of Signs

[0069] 1 ··· Jig 2 ··· Segment 3 ··· Link mechanism 4 ··· Body frame 5 ··· Support portion 6 ··· Connection member 10 ··· Ring member 21 ··· Contact portion 40 ··· Support shaft 41 ··· Hooking portion 50 ··· Support plate P1 ··· First position P2... the second position

Claims

1. A jig for expanding the diameter of an annular ring member made of an elastic material in the radial direction, comprising: a plurality of segments capable of contacting the inner circumference of the ring member; a plurality of support portions respectively supporting the plurality of segments so as to be displaceable in the radial direction between a first position on a first circle having a diameter smaller than the inner diameter of the ring member and a second position on a second circle concentric with the first circle and having a diameter larger than the inner diameter of the ring member; a link mechanism that links the plurality of support portions and positions the plurality of segments on the same circumference; The jig is provided with: The plurality of segments are arranged point-symmetric and line-symmetric with respect to the center of the circle on the same circumference; The segment is supported by a shaft extending in a direction orthogonal to the radial direction with respect to the support portion so as to be swingable about the shaft.

2. The segment is: Equally arranged in the circumferential direction. The jig according to Claim 1.

3. The segment is: It has a curved contact surface that contacts the inner circumference of the ring member. The jig according to Claim 1 or Claim 2.

4. Further comprising an annular main body frame, The main body frame has a plurality of support shafts that are parallel to the axial direction of the main body frame and are provided at intervals in the circumferential direction, The support portion is: It has a support plate that swingably supports the segment and is swingably supported with respect to the support shaft so that the segment is displaced within a range between the first position and the second position. The link mechanism is: It has a plurality of connecting members that connect the support plates of the adjacent support portions in the circumferential direction. The jig according to any one of Claims 1 to 3.

5. The main body frame has a latching portion capable of hooking a hook. The jig according to Claim 4.

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