JP2011031645A - Device for detaching bead mounted on tire attaching/detaching tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detaching a tire bead mounted on a tire attaching/detaching tool for attaching/detaching a tire with a claw by fixing a wheel to a rotation table, and turning the tire together with the wheel. <P>SOLUTION: The device 35 for detaching the tire bead includes: an arm 36; and a bead breaker 37. The arm 36 is mounted on the device for detaching a tire to swing on a level surface. The bead breaker 37 is mounted on a shaft 39 provided at a distal end of the arm 36, and vertical to the level surface. The bead breaker 37 can change its direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bead dropping device that is mounted on a tire detaching machine and includes a mechanism that can be adjusted according to the tire width.

  When a tire is attached to or removed from a wheel, a tire attaching / detaching device is generally used to improve the efficiency of the tire attaching / detaching operation. The method of attaching and detaching the tires also differs depending on the tire size. The tire can be attached and detached.

  By the way, when removing a tire from a wheel, this wheel is fixed to a turntable. A plurality of claws are provided on the rotary table, and these claws can slide in the radial direction to clamp the outer periphery of the wheel. For this reason, when the tire bead is fixed to the wheel, the outer periphery of the wheel cannot be clamped. Therefore, the tire bead is dropped before being attached to the rotary table.

  Therefore, if the claw is moved on the rotary table, the claw can penetrate between the tire bead and the wheel ear and clamp the outer periphery of the wheel. By the way, the bead dropping device is composed of an arm mounted on the main body and a bead breaker, which can swing in a horizontal plane, and the bead breaker is attached to the tip of the arm.

  The arm is swung by the operation of the air cylinder, and if the bead breaker attached to the tip is pressed against the tire bead, the tire bead fixed to the bead portion of the wheel is released. The bead dropping work stands up the tire along the side of the body of the tire removal machine, swings the arm and presses the tire breaker against the bead, but the bead breaker can press the tire bead correctly depending on the size of the tire. There may not be.

  The pressing surface formed at the tip of the bead breaker is preferably perpendicular to the tire bead, but this is not possible with a conventional bead dropping device in which a bead breaker is attached to the tip of the swinging arm. In recent flat tires and run flat tires that can run for a certain distance even when punctured, the tire bead is firmly fixed to the bead part of the wheel, so the bead breaker is properly oriented. It is necessary to press.

  As described above, the conventional bead dropping device of the tire attaching / detaching machine has the above-described problems. The problem to be solved by the present invention is this problem, and provides a bead dropping device that can efficiently drop a tire bead corresponding to all tire sizes.

  A tire attaching / detaching machine to which a bead dropping device according to the present invention is mounted has a rotary table that rotates in a horizontal plane, and the rotary table includes a plurality of claws for fixing a mounted wheel. It can slide in the radial direction. The detachable machine is equipped with tire nails that can be fitted or removed with tire bead wheels, demounting nails that can remove tire beads, bead press rollers that press tire beads, bead up rollers, etc. Yes.

  By the way, in the bead dropping device of the present invention, a bead breaker is attached to the swinging arm and the tip thereof, the arm extends from the side of the main body, and the bead breaker at the tip of the arm can change its direction to correctly press the tire bead. It consists of an adjustable mechanism. Here, the specific mechanism for changing the direction of the bead breaker is not limited.

  Since the bead dropping device according to the present invention can adjust the orientation of the bead breaker attached to the tip of the arm, the tip pressing surface of the bead breaker is perpendicular to the tire bead even in a flat tire or the like having a wide width. You can hit and press. Therefore, the tire bead is easily detached from the bead portion of the wheel, and the bead dropping operation can be performed efficiently. In addition, since the pressing surface of the bead tip is perpendicular to the tire bead, it is not difficult for the bead breaker.

The top view of a tire attaching / detaching apparatus. The front view of a tire attaching / detaching apparatus. A process of attaching tires to wheels. The Example which shows the tire bead dropping apparatus which concerns on this invention. The Example which shows the tire bead dropping apparatus which concerns on this invention. The Example which shows the tire bead dropping apparatus which concerns on this invention. The Example which shows the tire bead dropping apparatus which concerns on this invention. When pressing the demounting claw against the upper bead. The process of swinging the demounting claw and bringing the tip closer to the wheel. The upper bead is engaged with the outer groove of the demounting claw. When the demounting claw is raised and the upper bead is detached from the wheel ear.

  1 and 2 are external views showing a tire detaching machine equipped with a bead dropping device according to the present invention. FIG. 1 is a plan view and FIG. 2 is a front view. In the figure, 1 is a tire claw, 2 is a rotary table, 3 is a bead press roller, 4 is a demount claw, 5 is a presser plate, and 9 is a bead-up roller. .. Are attached to the rotary table 2, and each of the claws 6, 6... Can be operated by an air cylinder 7 attached to the lower side of the rotary table 2. The wheel placed on can be fixed. That is, the claws 6, 6... Protrude from the upper surface of the turntable 2 and slide in the radial direction to clamp the wheel.

  If the tire is mounted on the wheel, it is placed on the rotary table 2 as it is and clamped by the claws 6, 6... The bead is dropped and placed on the turntable 2. The tire bead is firmly fixed to the bead portion of the wheel. Therefore, if the tire bead is placed on the rotary table 2 without being dropped and clamped with the claws 6, 6,. ... The wheel cannot be clamped because the tip hits the side of the tire.

  Further, separate air cylinders 8 and 34 are attached to both sides of the main body, and when the air cylinders 8 and 34 are operated, the presser plate 5, the bead press roller 3, the demounting claw 4, and the bead up roller 9 are moved. Can move up and down. The tire pawl 1 is fixed to the lower end of the vertical guide pole 10, and the vertical guide pole 10 is fitted to a vertical axis receiver 12 so as to be movable up and down.

  A column 11 stands vertically at the center of the main body, and a horizontal bearing 13 is provided at the upper end of the column 11. A horizontal guide pole 14 is slidably fitted to the horizontal bearing 13. Therefore, the position of the tire claw 1 can be changed according to any tire size by expanding and contracting the vertical guide pole 10 and the horizontal guide pole 14. That is, it can be locked to tire beads of any size.

By the way, this tire attaching / detaching device can be used to attach a tire to a wheel and to remove the tire from the wheel.
(Tire mounting process)
(1) Fix the wheel to the rotary table.
When wearing tires, it is not necessary to use the bead dropping device of the present invention. .. Are attached to the rotary table 2, and by operating the air cylinder 7, each of the claws 6, 6. Claws 6, 6... Are locked and fixed to the outer periphery of the mounted wheel 20.
(2) The tire 21 is disposed on the wheel 20.
(3) Fit the lower bead of the tire 21.
If the under tire bead is locked to the tire claw 1 and the wheel 20 and the tire 21 are rotated together with the rotary table 2 in this state, the under tire bead is fitted to the wheel 20. In this case, since the upper bead is in a free state, even a flat tire or a run flat tire can be fitted relatively easily.
(4) Fit the bead on the tire.
Also in this case, when the upper bead is locked to the tire claw 1 and the wheel 20 and the tire 21 are rotated together with the rotary table 2 in this state, the tire upper bead fits into the wheel 20, but the vicinity of the upper bead portion is bead press roller 3 Press at. This state is shown in FIG. Then, if necessary, the presser plate 5 is rotated against the upper surface of the tire. The tire bead once fitted by the presser plate 5 does not come off from the wheel 20, and the entire circumference can be fitted by one turn of the tire 21. The presser plate 5 is connected to the upper surface of the tire 21 by connecting three links 17, 18, 19 connected via a joint from a base 15 that moves up and down along the guide post 16. It can rotate with the tire 21 in the applied state.

  On the other hand, when the tire 21 is removed from the wheel 20, the wheel 20 on which the tire 21 is mounted cannot be mounted on the rotary table 2 as it is and fixed with the claws 6, 6,. That is, when the tire beads are fixed to the bead portion of the wheel 20, the claws 6, 6,... Cannot be locked to the outer periphery of the wheel. Therefore, an operation of dropping the tire bead before being placed on the turntable 2 is performed.

  1 and 2 is equipped with a bead dropping device 35, and the tire bead is dropped. The bead dropping device 35 includes an arm 36 and a bead breaker 37. The arm 36 is attached to the main body of the tire attaching / detaching machine, and can swing in a horizontal plane by operating an air cylinder. The bead breaker 37 is generally fan-shaped and is attached to the tip of the arm 36, and an upright tire is disposed facing the main body, and the pressing surface 38 of the bead breaker 37 is pressed against the tire bead to thereby rotate the wheel. Remove from the bead. That is, bead dropping is performed.

  By the way, the direction of the bead breaker 37 of the bead dropping device 35 according to the present invention can be changed and adjusted according to the width dimension of the tire 21. FIG. 4 shows an embodiment of a bead dropping device 35 according to the present invention. A bead breaker 37 is attached to a shaft 39 and its direction can be changed. In the figure, the tip of the lever 40 extending from the bead breaker 37 is fixed by a pin 41, and the pin 41 is inserted into a pin hole 42 a provided in the arm 36 to fix the lever 40. Therefore, the orientation of the bead breaker 37 can be changed if the pin 41 is inserted into another pin hole 42b provided adjacently. That is, the bead breaker 37 is positioned in the direction indicated by the dotted line in FIG.

  FIG. 4 shows a state in which the tire 21 is mounted on the wheel 20, but the tire 21 stands along the tire receiver 44 (see FIG. 1) provided on the main body, and the arm 36 is swung in this state. Then, the tip pressing surface 38 of the bead breaker 37 is pressed against the tire bead 43 to be separated from the bead portion of the wheel 20. At this time, if the orientation of the bead breaker 37 is not appropriate, the bead breaker 37 contacts the outer peripheral ear 24 of the wheel 20 as the arm 36 swings.

Further, if the direction of the pressing force acting on the bead 43 is bad, it is difficult to leave. Therefore, the bead dropping operation is performed when the direction of the bead breaker 37 is adjusted to an appropriate direction according to the tire size, particularly the tire width. Of course, the tire bead 43 cannot be dropped in one pressing step, and the same operation is repeated a plurality of times. And the tire 21 can be reversed and the tire bead 43 on the opposite side can also be dropped.

  FIG. 5 shows another embodiment of the bead dropping device 35. Also in this device, a bead breaker 37 is attached to a shaft 39 provided at the tip of the arm 36, and the tip of a lever 40 extending from the bead breaker 37 is applied to a bolt 45 attached to the tip of the arm for adjustment. Therefore, the direction of the bead breaker 37 can be changed by rotating the bolt 45. The lever 40 is pulled by a coil spring 46 so as not to be separated from the bolt tip.

  FIG. 6 shows another embodiment of the bead dropping device 35. A lever 49 extending from the bead breaker 37 is supported by a shaft 47 provided at the end of the arm, and a ratchet gear 48 is attached to the lever 49. A claw 50 is engaged with the ratchet gear 48 to prevent counterclockwise rotation in FIG. Therefore, by removing the claw 50 from the ratchet gear 48, the direction of the bead breaker 37 can be corrected, and the bead 43 can be pressed by the pressing surface 38 at the tip.

  FIG. 7 shows still another embodiment showing a bead dropping device according to the present invention. In this bead dropping device, the bead breaker 37 is attached to a shaft 47 provided on the arm 36, and the tip of the lever 52 further extending from the shaft 47 is connected to the tip of the piston rod of the air cylinder 51 attached to the arm 36. ing. Therefore, when the air cylinder 51 is operated and the piston rod expands and contracts, the lever 52 swings and the direction of the bead breaker 37 can be changed.

  Thus, the bead dropping device 35 of the present invention can be arranged in a direction suitable for the width size of the tire by adjusting the direction of the bead breaker 37. The bead dropping device 35 shown in FIGS. 4 to 7 is merely a specific example, and is not limited to these examples. Further, the bead breaker 37 changes its direction based on the horizontal axis so as to correctly press the bead against the outer diameter of the tire. This vertical swinging can be performed by operating the handle lever 53.

(Tire bead removal process)
(1) Wheel fixing.
The wheel 20 on which the tire 21 from which the bead 43 has been dropped is mounted is fixed to the rotary table 2 via a plurality of claws 6, 6.
(2) The vicinity of the upper bead portion of the tire 21 is pressed with the tip of the demounting claw 4.
FIG. 8 shows a case where the vicinity of the bead portion on the tire is pressed at the tip of the demounting claw 4.

By the way, the demounting claw 4 is attached to the tip of the square section shaft 22 and can swing around the shaft 33. A bead press roller 3 is rotatably supported at the tip of the square section shaft 22 in a pair with the demounting claw 4. If the air cylinder 25 and the spring 26 are attached and the air cylinder 25 operates and the piston rod protrudes, the tip of the demounting claw 4 moves away from the wheel 20 and the air cylinder 25 is turned off. The tip of the demounting claw 4 approaches the wheel 20 by the spring force of the spring 26.

  The square cross-section shaft 22 extends toward the center of the wheel 20, and the square cross-section shaft 22 can slide according to the outer diameter of the wheel 20. That is, the square section shaft 22 is slid and locked at a predetermined position so that the tip of the demounting claw 4 presses the vicinity of the bead 23 on the tire. The square section shaft 22 is supported by a bearing 28 and includes a lock plate 30 that is operated by an air cylinder 29 so that it can be locked at a predetermined position.

  8B, the demounting claw 4 is disposed at a position close to the ear portion 24 of the wheel 20, but the base portion 27 to which the bearing 28 is attached is a guide post. By descending along (not shown), the tip of the demounting claw 4 can be deformed by pressing the vicinity of the upper bead portion. Here, the lowering of the base 27 is performed by the operation of the air cylinder 34. However, even if the demounting claw 4 is lowered at this position and pressed near the upper bead portion, the upper portion of the tire is deformed, but the upper bead 23 cannot be engaged with the demounting claw 4.

(3) Demounting claw swinging.
If the demounting claw 4 is pressed near the upper bead portion of the tire 21, the upper bead 23 is deformed. However, as described above, even if the demounting claw 4 is lowered as it is, the upper bead 23 is not engaged with the outer groove 31, so the direction of the demounting claw 4 is changed when it is lowered to some extent. That is, as shown in FIG. 9, the upper bead 23 can be engaged with the outer groove 31 if the tip of the demounting claw 4 approaches the wheel 20 and further descends in this state. When the direction of the demounting claw 4 is set to a predetermined angle from the beginning, the tip of the demounting claw 4 comes down to the lower side of the ear 24 as shown in FIG. The direction is changed, and the tip approaches the upper bead 23.

Here, the demounting claw 4 is pivotally supported so as to be swingable about the shaft 33 in order to change the direction. If the piston rod of the air cylinder 25 is protruded, the tip of the demounting claw 4 moves away from the wheel. Conversely, if the piston rod is retracted by turning OFF, the spring force acts and the tip of the demounting claw 4 approaches the wheel. I can do it. That is, the tip part of the demounting claw 4 is brought closer to the ear part 24 of the wheel 20 and further pressed and lowered while the tip is brought close to the upper bead 23.

(4) The upper bead engages with the outer groove of the demounting claw.
If the direction of the demounting claw 4 is changed so that the tip portion approaches the ear portion 24 and is pressed down in this state, the upper bead 23 engages with the outer groove 31 as shown in FIG.
(5) Disengagement of upper bead.
When the upper bead 23 is engaged with the outer groove 31 of the demounting claw 4, the demounting claw 4 rises. Then, the upper bead 23 is detached from the ear portion 24 of the wheel 20.
In this case, the air cylinder 25 is in an OFF state, and a spring force is applied to the demounting claw 4 so that the tip of the demounting claw 4 swings in a direction approaching the wheel side. Rises while swinging along the outer periphery of the wheel 20.

(6) The inner groove of the demounting claw is engaged with the ear.
If the demounting claw 4 rises with the spring force approaching the wheel end toward the wheel side, the inner groove 32 of the demounting claw 4 engages with the wheel ear 24 as shown in FIG. . Accordingly, the tip of the demounting claw 4 is positioned by engaging the inner groove 32 with the ear 24 of the wheel 20.

(7) Removing the upper bead.
The outer groove 31 is at a higher position than the inner groove 32, that is, when the inner groove 32 is engaged with the ear portion 24, the upper bead 23 engaged with the outer groove 31 is higher than the ear portion 24. In this state, the wheel 20 is detached. Therefore, if the wheel 20 and the tire 21 rotate in this state, the entire circumference of the upper bead 23 is removed from the wheel 20. Here, since the air pressure of the air cylinder 34 is removed, the tire 21 rotates and the tire bead 23 is removed from the wheel 20, so that the force to push down the demounting claw 4 is reduced. The demounting claw 4 does not come off the wheel ear 24. That is, the upper bead can be removed safely.

(8) Removing the lower bead.
If the tire 21 with the upper bead 23 removed from the wheel 20 rotates the tire 21 by pressing the bead up roller 9 against the lower surface of the tire 21, the lower bead is easily detached from the wheel 20. Of course, in the present invention, the removal of the lower bead is out of scope, and the present invention is not limited to the case where the bead-up roller 9 is used.

  In the above embodiment, when the demounting claw 4 is lowered to some extent (when the bead portion on the tire is pressed and deformed), the direction is changed to bring the tip close to the wheel, but the demounting claw 4 is rotated. Alternatively, the tip end can be brought close to the wheel 20 by sliding the square section shaft 22 at a position where it is lowered to some extent. However, if the demounting claw 4 is fixed so as not to rotate at all, when the upper bead 23 is engaged and lifted, the ear 24 becomes an obstacle, so if the tip contacts the ear 24, the spring It is necessary to oscillate 26 so that it is compressed and pushed back.

1 Tire Claw 2 Rotating Table 3 Bead Press Roller 4 Demount Claw 5 Presser Plate 6 Claw 7 Air Cylinder 8 Air Cylinder 9 Bead Up Roller
10 Vertical guide pole
11 support
12 Vertical axis support
13 Horizontal bearing
14 Horizontal guide pole
15 base
16 Guide post
17 links
18 links
19 links
20 wheels
21 tires
22 Square section axis
23 Upper Bead
24 Ear
25 Air cylinder
26 Spring
27 Base
28 bearings
29 Air cylinder
30 Lock plate
31 Outer groove
32 inner groove
33 axes
34 Air cylinder
35 Bead removal device
36 arms
37 Bead breaker
38 Press surface
39 axes
40 lever
41 pin
42 pin hole
43 Bead
44 Tire receiver
45 volts
46 Coil spring
47 axes
48 Ratchet gear
49 Lever
50 claw
51 Air cylinder
52 Lever
53 Handle lever

Claims (5)

In a tire bead dropping device attached to a tire attaching / detaching machine that can attach and detach a tire by a claw by fixing a wheel to a rotary table and rotating the tire together with the wheel, the tire bead dropping device is composed of an arm and a bead breaker The arm is attached to the main body of the tire attaching / detaching machine so that the arm can swing in a horizontal plane, and a bead breaker is attached to an axis provided at the tip of the arm and perpendicular to the horizontal plane, and the bead breaker is oriented in the direction. A bead dropping device mounted on a tire detaching machine characterized by changing. The bead dropping device attached to the tire detaching machine according to claim 1, wherein a lever extending from the bead breaker is fixed to an arm so as to be in a predetermined direction via a pin. 2. A bead dropping device attached to a tire detaching machine according to claim 1, wherein a lever extending from the bead breaker is fixed so as to be in a predetermined direction by being applied to a bolt tip screwed to an arm. 2. A tire attachment / detachment according to claim 1, wherein a ratchet gear is attached to a tip of a lever extending from the bead breaker, a shaft is provided at the center of the ratchet gear and attached to the arm, and a claw that engages with the teeth of the ratchet gear is attached to the arm. Bead removal device installed in the machine. 2. A bead dropping device mounted on a tire detaching machine according to claim 1, wherein a lever extending from the bead breaker is connected to a tip of a piston rod of an air cylinder attached to an arm.

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