JPS6134884Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic bead breaker, and in particular, allows tires to be replaced without removing the wheels from the vehicle.

In conventional tire replacement work, when removing a heavy tire from a vehicle by loosening the wheel nuts, the worker must remove it from the drum, at times causing back pain, and work on the floor using a bead remover to manually remove the bead part that is difficult to remove. Because the parts were falling off during the work, the workability was poor and it took a lot of time.

The object of the present invention is to provide an automatic bead breaker that allows tires to be replaced without removing the wheels from the vehicle.

For this reason, the configuration of the present invention includes a frame having wheels at the bottom thereof, a pair of pawls which are disposed oppositely on the frame at an appropriate horizontal distance and whose height is adjustable, and which sandwich the tire bead portion. The device is characterized in that it includes a drive device that moves one of the pair of claws toward and away from the other claw.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention. In the figure, reference numeral 1 denotes a frame, which has wheels 12 such as caster rollers at its lower part. The frame 1 includes a pantograph jack knob 2, a pantograph jack 3, a switching valve lever 4, a switching valve 5, air adjustment valves 6a and 6b, an air cylinder 7, one attachment 8, and one bead drop claw 9. , the other attachment 10,
The other bead drop pawl 11 and the like are placed on top.

FIG. 2 is a partially cutaway front view of FIG. 1. The operation will be explained with reference to FIG. After jacking up the vehicle, insert the automatic bead breaker shown in the figure between the tires 19, turn the pantograph jack knob 2, and turn the pantograph jack 3 to align one bead drop pawl 9 with the front tire bead 16. The height is adjusted by moving it up and down, and then the adjustment screw 18 is loosened and the other bead drop pawl 11 is aligned with the rear tire bead portion 22 as well. Thereafter, air shown by arrow C enters the switching valve 5, and by moving the switching valve lever 4, air passes through the air hose 15 and enters the air adjustment valve 6a, and the air at the adjusted pressure is transferred to the air cylinder 7. It enters the rear side, the piston rod 13 operates, the bead drop claw 9 bites into the front bead part 16, the front bead part 16 falls, and then, when one attachment 8 hits the wheel 17, the automatic bead breaker is activated. The wheel 12 moves backward in the direction of the arrow 24, and the bead portion 22 on the back side
When the other bead drop claw 11 bites into the bead, the back side bead portion 22 falls, and the other attachment 10 hits the wheel 17, the operation of the piston rod 13 is stopped. In this way, the front and back bead portions 16
and 22 have fallen, air switching valve lever 4
By moving the piston rod 13 in the opposite direction, air shown by arrow C enters the air hose 14, passes through the air adjustment valve 6b, and air at the adjusted pressure enters the front side of the air cylinder 7, causing the piston rod 13 to move in the opposite direction. The bead drop claw 9 is removed from the front bead portion 16. When the piston rod 13 operates in reverse, air passes through the air adjustment valve 6a from the rear side of the air cylinder 7 and comes out from the outlet of the switching valve 5. This series of operations creates a mechanism in which the front and back bead portions 16 and 22 fall.

FIG. 3 is an explanatory diagram of the operation of the air switching valve 5. Normally, the switching lever 4 is kept in the neutral N position, and by operating the lever 4 to the A side, air enters from the arrow 25 side and exits in the arrow 30 direction. At the same time, air escapes from arrow 27 in the direction of arrow 26. Also, by operating the lever 4 to the B side, air enters from the arrow 25 side,
Exit in the direction of arrow 28. At the same time, air begins to escape from the direction of arrow 29 to the direction of arrow 26.

FIG. 4 is an enlarged perspective view of one attachment 8 (the other attachment 10 is also the same). That is, an L-shaped attachment 8 is attached to the tip of the piston rod 13, and a bead drop pawl 9 has the same radius as the wheel.
(The same applies to the claws 11).

FIG. 5 is a front view showing the bead parts 16 and 22 in a fallen state. That is, when the beads 16 and 22 fall and the attachments 8 and 10 hit the wheel 17, it becomes as shown in the figure.

FIG. 6 shows an example of a stand used when breaking a single tire with the automatic bead breaker shown in FIG. This stand 20 has a groove 23 inserted between the roller 21 on which the tire is placed and the frame 1, and by performing the same operation as explained in FIG. 2, the bead part can be dropped even in the case of a single tire. be able to.

As described above, according to the present invention, tire replacement work can be performed without removing the wheels from the vehicle, and what was conventionally considered to be heavy labor can be reduced to light work and time can also be shortened. Furthermore, since the height of the pair of bead drop claws provided on the frame is adjustable, it can be used for tires of different sizes.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a perspective view, Figure 2 is an enlarged partially cutaway front view of Figure 1, Figure 3 is an explanatory diagram of the operation of the air switching valve in Figure 1, and Figure 4 is an enlarged perspective view of the attachment in Figure 1. , FIG. 5 is a front view showing a state in which the tire bead part is dropped, and FIG. 6 is a perspective view of the single tire drop stand. 1... Frame, 9... One bead drop claw,
11...Other bead drop claw, 12...Wheel, 1
6...Front side tire bead part, 22...Back side tire bead part.

Claims (1)

[Scope of utility model registration request] A frame having a wheel at the bottom, a pair of claws that are arranged oppositely on the frame at an appropriate horizontal distance so that the height can be adjusted and sandwich the tire bead, and one of the pair of claws. An automatic bead breaker comprising a drive device that moves one claw toward and away from the other claw.