JPH056166Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a tire clamp device for attaching and detaching tires in a tire changing machine.

(Prior Art) Conventionally, this type of tire clamp device has cylinders fixed to the turntable on both sides of the rotating shaft on the underside of the turntable, and piston rods fitted in each cylinder protruding in opposite directions.
An air cylinder device is arranged in which the tip of each piston rod is connected to a clamp piece fitted into the slide hole of the turntable, and by the operation of the air cylinder device, both piston rods are expanded and contracted, and both clamp pieces connected to this are expanded and contracted. In addition to moving the distance from distance to distance, other clamp pieces arranged on the turntable are simultaneously moved by an interlocking mechanism connected to this, and the concentric circle formed by these clamp pieces is expanded or contracted to clamp or release the tire. It was something that made me want to do something.

(Problem to be solved by the invention) However, the conventional air cylinder device of the above-mentioned tire clamp device is arranged on both sides of the rotating shaft, each cylinder is fixed to the turntable, and the piston rods fitted to the turntable are arranged in opposite directions. Since the piston rods are operated to expand and contract in both directions, variations in the operation of both piston rods directly act on the clamp piece, and there is a risk that this may affect the tire clamping force or the like. Also, since air is supplied to both cylinders from both ends through hoses, four pipes are required.In addition, the turntable is rotated by a rotating shaft to attach and remove tires, and an air cylinder device is integrated with this. and 4 piped to this
Since the main hoses also rotate, the air supply structure becomes complicated in order to reliably supply air from the stationary side of the machine to the four hoses of the rotating air cylinder device. However, it also had the disadvantage of being cumbersome and lacking in durability and robustness.

Therefore, this invention was made in view of the above-mentioned conventional problems and to solve them.
Eliminating variations in the operation of both air cylinder devices, it is possible to clamp tires strongly and reliably, and
To obtain a device which is robust and has excellent durability by simplifying air supply to both air cylinder devices and leakage prevention means.

(Means for Solving the Problem) As a means to achieve this, this invention uses an interlocking mechanism that simultaneously operates each clamp piece in the radial direction, which is arranged on a turntable on a rotating shaft fitted in a bearing part of a machine base. Connected to the mechanism, air cylinder devices are arranged in parallel on both sides of the rotating shaft, the ends of both cylinders of the air cylinder device are connected by a connecting rod, and the air chambers on the extension side of each cylinder are communicated with each other in the connecting rod. A flow path is formed, and the ends of both piston rods are also connected by a connecting rod, and a flow path is formed in the connecting rod that passes through the rod and leads to the contraction side air chamber of each cylinder. The connecting rod and the connecting rod on the piston rod side are connected to the opposing clamp pieces, respectively, so that both clamp pieces can be operated simultaneously in opposite directions of approaching and separating from each other. The passages are connected to the respective flow passages of the two connecting rods by flexible hoses.

(Example) An example of a specific configuration of this invention shown in the drawings will be described in detail below.

A rotating shaft 4 is fitted into a bearing 3 attached to a base 2 of a tire changing machine 1, a turntable 5 is fixed to the upper end of the rotating shaft 4, and a drive device (not shown) is fitted.
It is installed upright so that it can be rotated by. A cross-shaped slide hole 6 is bored in the turntable 5, and a clamp piece 7 for locking a tire is slidably fitted into the slide hole 6. The interlocking mechanism 8 consists of a rectangular rotating plate 9 and levers 10 pivotally attached to each of its four corners. The tips are pivotally attached to the clamp pieces 7, respectively. The air cylinder device 11 is composed of a cylinder 12, a piston 13 slidably fitted into the cylinder, and a piston rod 14 connected to the piston 13. A contraction side air chamber 15 is formed on the side, and an expansion side air chamber 16 is formed on the opposite side. In this air cylinder device 11, the piston rods 14 are arranged in parallel inside the rotating shaft 4 so that they are oriented in the same direction, and the tips of both piston rods 14 are connected by a connecting rod 17, and the tips of both cylinders 12 are also connected by a connecting rod. Connect at 18. Furthermore, both connecting rods 17, 18
are respectively fitted into brackets 19 protruding from the lower surface of the clamp piece 7, whereby the opposing clamp pieces 7, 7 are connected by two air cylinder devices 11, 11.

Next, to explain the air supply means to this air cylinder device 11, the bearing part 3 of the machine stand 2 has an annular groove 20a in two stages, upper and lower, opening on the inner surface.
20b is formed, and the supply ports 2 are formed on one side respectively.
Air hoses 22a and 22b are connected to 1a and 21b. The rotary shaft 4 fitted in the bearing part 3 is vertically provided with flow passages 23a and 23b whose openings face the two annular grooves 20a and 20b of the bearing part 3, respectively.
Outlet ports 24a and 24b are located above a and 23b, respectively.
are opened, and one ends of flexible hoses 25a and 25b each wound into a coil are connected thereto. The tip of one hose 25a of this flexible hose is connected to the central connection hole 26 of the flow path 27 formed in the connection rod 17 connected to the piston rod 14, and both ends of the flow path 27 are connected to the connection rod 17. A flow path 2 formed in the fitted piston rod 14
The inner end of the flow path 28 is opened 29 into the contraction side air chamber 15 of the cylinder 12 near the joint portion of the piston 13 . Also, the tip of the other flexible hose 25b is connected to the cylinder 1.
The flow path 3 formed in the connecting rod 18 connected to 2
The cylinder 12 is connected to the central connecting hole 30 of the cylinder 1, and both ends of the flow path 31 are connected and fitted to the connecting rod 18.
It is connected to an opening 32 that communicates with the extension side air chamber 16 .

Note that the upper and lower portions of the flow passages 23a and 23b of the rotating shaft 4 that open and face the annular grooves 20a and 20b of the bearing portion 3, the connecting portion between the connecting rod 17 and the piston rod 13,
Of course, the connecting portion between the connecting rod 18 and the cylinder 12 is provided with an O-ring or the like to prevent air leakage.

33 is a clamp pedal for operating the clamp piece 7, 34 is a turntable pedal for rotating the turntable, 35 is a pedal for operating a bead breaker, 36 is a bead drop part, 37 is a tire attachment/detachment jig, and the upper end of the support 38 is The support arm 39 is attached to the tip of a support arm 39 which is rotatably pivotally connected to the support arm 39 so as to be adjustable up and down.

With this structure, in order to detach the tire from the wheel, place the tire with the beads removed on the turntable 5, and then step on the clamp pedal 33. The air sent into the annular groove 20a of the bearing part 3 from 22a is sent to the hose 25a through the flow path 23a of the rotating shaft 4, and from the tip of the hose 25a to the flow path 27 formed in the connecting rod 17. The air flows into the flow path 27, branches left and right, enters the flow path 28 of the piston rod 14 from both ends, passes through the flow path 28, and is fed into the contraction side air chamber of the cylinder 12 through the opening 29. As a result, the piston 13 slides to the right in FIG.
Since the piston rod 14 is drawn into the cylinder 12 and the cylinder 12 moves to the left, the connecting rod 17 at the tip of the piston rod 14 and the connecting rod 18 at the tip of the cylinder 12 simultaneously approach each other so that the distance between them becomes narrower. By the way, these connecting rods 17 and 18 are connected to the brackets 1 fixed to the opposing clamp pieces 7 and 7, respectively.
9, 19, both connecting rods 17,
18 causes both clamp pieces 7, 7 to slide in the slide hole 6 toward the center. At the same time, the lever 10 of the interlocking mechanism 8, which is pivotally connected to the clamp piece 7, also moves as shown by the chain line in FIG. The clamp pieces 7 which are not directly actuated by the turntable 11 also move toward the center at the same time, and the clamp pieces 7 are actuated from all sides to contract in diameter, firmly clamping and fixing the wheels of the tires on the turntable 5. In addition, at this time, the extension side air chamber 1 which becomes the back pressure part of the cylinder 12
The air in 6 flows from the opening 32 to the flow path 3 of the connecting rod 18.
1. The water is discharged from the hose 22b through the hose 25b, the flow path 23b of the rotating shaft 4, and the annular groove 20b of the bearing portion 3.

Once the tire is clamped and fixed on the turntable 5 in this way, the tire attachment/detachment jig 37 at the tip of the support arm 39 is engaged with the tire bead by the tire lever, and the turntable pedal is pressed. 34 to rotate the turntable 5 and remove the tire from the wheel.

After removing the tire, press the clamp pedal 3 again.
When you step on 3, this will switch the air flow path.
Contrary to the above, from the hose 22b to the annular groove 2 of the bearing part 3.
Air flows into the flow path 23b and the hose 25.
b, the cylinder 1 from the opening 32 through the flow path 31;
Air is sent into the extension side air chamber 16 of No. 2,
By sliding the piston 13 in the opposite direction to the above, the connecting rod 17 at the tip of the piston rod 14
Since the distance between the connecting rod 18 at the tip of the cylinder 12 becomes wider, the clamp piece 7 attached thereto slides in the slide hole 6 in the outer circumferential direction, and the four clamp pieces 7 are moved by the interlocking mechanism 8. simultaneously expands the diameter and releases the wheel clamp.

In the above embodiment, four clamp pieces are arranged on the turntable, but the present invention is not limited to this, and the number of clamp pieces may be several.

(Effects of the invention) As described above in detail with respect to the embodiments, the double air cylinder device of this invention connects both cylinders to each other and both piston rods with the connecting rod, and also connects the clamps that face each of the connecting rods. Because they are attached directly to each piece,
Even within the limited space of a narrow turntable, air cylinder devices with strong expansion and contraction force can be placed compactly in parallel on both sides of the rotating shaft. Even if the device is activated and the cylinder and piston rod simultaneously extend and contract, the turntable can rotate without losing its balance.Moreover, the direct attachment of the connecting rod allows the opposing clamp pieces to be rotated in the radial direction. Since the clamp pieces are directly expanded and contracted, at least the opposing clamp pieces act on the tire wheel with the same pressure and can firmly and reliably clamp the tire with strong clamping force without wobbling. Furthermore, the inside of the connecting rod and the piston rod are used to form air passages that lead to the extension side air chamber and the contraction side air chamber of both cylinders, respectively, so that the air at the bottom of the turntable is The supply flow path can be formed simply, and air can be supplied efficiently by reliably preventing air leakage.
A tire clamp device that is robust and has excellent durability can be provided at a low cost.

[Brief explanation of the drawing]

Figure 1 is a side view of this invention, Figure 2 is a front view, Figure 3 is a plan view, Figure 4 is a partially cutaway plan view of the turntable, and Figure 5 is a side view that can be partially cut away. , FIG. 6 is a longitudinal cross-sectional side view of the bearing part,
FIG. 7 shows a partially cut away plan view of the air cylinder device. DESCRIPTION OF SYMBOLS 1... Tire changing machine, 2... Machine stand, 3... Bearing part, 4... Rotating shaft, 5... Turntable, 7...
... Clamp piece, 8 ... Interlocking mechanism, 11 ... Air cylinder device, 12 ... Cylinder, 13
...Piston, 14...Piston rod, 15...
...Contraction side air chamber, 16...Extension side air chamber, 1
7, 18... Connection rod, 20a, 20b... Annular groove, 23a, 23b... Channel, 25a, 25b...
... Flexible hose, 27, 28, 31 ... Channel, 2
9, 32...opening.

Claims (1)

[Scope of utility model registration request] Each clamp piece placed on the turntable on the rotating shaft fitted into the bearing part of the machine base is connected to an interlocking mechanism that operates in the radial direction at the same time, and air cylinder devices are arranged in parallel on both sides of the rotating shaft. The tips of both cylinders of the air cylinder device are connected by a connecting rod, and a flow path is formed in the connecting rod that leads to the air chamber on the extension side of each cylinder, and the tips of both piston rods are also connected by the connecting rod. A flow path passing through the rod and leading to the contraction side air chamber of each cylinder is formed in the connecting rod, and the connecting rod on the cylinder side and the connecting rod on the piston rod side are respectively connected to the opposing clamp pieces. The clamp pieces can be operated in mutually opposite directions such as approaching and separating from each other at the same time, and furthermore, both flow passages that communicate with the rotating shaft from the bearing portion are connected to the flow passages of the above-mentioned two connecting rods by flexible hoses, respectively. A tire clamp device for a tire changing machine characterized by: