JPH0627446Y2 - Tire changer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a tire exchanging device capable of manually and easily attaching and detaching a tire and a wheel.

[Conventional technology and its problems]

As a method of attaching and detaching tires and wheels,
Push the rod between the wheel and the tire to separate the bead part of the tire from the rim of the wheel, and in that state rotate the wheel to move the rod along the outer circumference of the wheel to pull out the tire and the wheel. The method of pushing it in is adopted.

Since the detaching work as described above requires a considerably large force, the conventional tire exchanging device has a structure in which the wheel is rotated and the operation rod is pushed in by utilizing hydraulic pressure or electric force. Therefore, there is a drawback that the device becomes large in size and expensive in price, and when it is used, it requires a hydraulic power source, a power source, etc., so in most cases it is used in a well-equipped maintenance factory etc. It was not possible to use it in ordinary households.

On the other hand, there is a device proposed in Japanese Utility Model Publication No. 43-22563 as a device capable of manually attaching a tire to a wheel.

In the proposed device, a frame supporting a tire wheel is rotatably provided with a vertical main shaft, a lifting ram and a tire pushing tool are attached to the main shaft, and a horizontal handle is attached to a lower end of the main shaft via a bevel gear. The structure is such that the tire is pushed into the wheel through the pusher by rotating the main shaft with the handle.

By the way, when pushing the tire into the wheel, due to the resilience of the tire, a strong return force opposite to the pushing direction is always applied to the pushing tool, but with the above structure, the bevel gear used for transmitting the rotational force is Since it has only the function of transmitting the rotational force, the return force acts to directly rotate the handle or the frame and hinders stable operation. For this reason, in the above-mentioned proposed device, in order to perform the work stably, it is necessary to fix the frame to the concrete floor or the like, and it is not possible to use it in a general home or carry it with a car easily. There is.

Furthermore, between the wheel and the tire, it will be in a strongly adhered state after long-term use, or it will be adhered with an adhesive in order to obtain good sealing performance. In order to push in the pushers, they must be peeled off before work.

However, in the above-mentioned proposed device, the operator manually pushes the tire pushing tool into the tire and does not have a structure for mechanically pushing down the tire, so that the wheel and the tire that are in close contact can be easily peeled off. I can't. For this reason, it is necessary to forcibly push the rod or the like into the closely contacted portion and peel it off, which requires a great deal of work and is liable to damage the tire or the like.

Therefore, this device can be stably installed and removed without being affected by the returning force applied from the tire, and can be easily used at home or carried in a car. An object of the present invention is to provide a tire exchanging device that can be easily peeled off even when the tire and the wheel are in close contact with each other.

[Means for solving problems]

In order to achieve the above object, the tire exchanging device of the present invention has a sleeve shaft perpendicular to a wheel supporting surface rotatably provided at the center of a frame to which a tire wheel is supported and fixed, and an upper end of the sleeve shaft. , A fitting hole into which the rotary shaft is removably fitted is provided, rotation preventing means for the rotary shaft is provided in the fitting hole, and a shaft hole is formed at the bottom of the fitting hole, and the lower end of the sleeve shaft is provided. A worm wheel is attached to the worm wheel, a worm attached to a frame and connected to a handle is meshed with the worm wheel, and a support portion capable of supporting the operation rod in a forward and downward inclined state is provided at the upper end of the rotary shaft, and The foldable legs are attached to the frame.

[Operation] The tire changing device is stored or carried with the legs of the frame folded.

When using, the tire wheel is supported and fixed to the frame, but if the tire and the wheel are in close contact, attach a screw shaft etc. to the screw hole of the sleeve shaft, and use the propulsive force of the screw shaft etc. Peel off the tire and wheel by pushing down on the mounting part of the wheel and wheel.

When the tire is peeled off, the rotary shaft is inserted into the fitting hole of the sleeve shaft, the push-in portion of the operation rod attached to the rotary shaft is pushed between the tire and the wheel, and the handle is operated to rotate the rotary shaft. As a result, the operating rod rotates along the outer periphery of the wheel to attach and detach the tire and the wheel.

When the tire is attached or detached, the return force applied from the tire to the operating rod is transmitted to the handle and frame through the worm wheel and the worm. Since they try to adhere to each other to keep balance with the external force, the action of the returning force is stopped at the meshing portion, and the stable operation can be performed without being transmitted to the handle or the frame.

〔Example〕

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

As shown in FIGS. 1 and 2, the frame 1 includes a circular outer frame 2 and a circular inner frame 3 concentrically arranged with respect to the outer frame 2. Are connected by three arms 4 arranged radially, and legs 5 are foldably connected to the outer ends of the arms 4.

The arm 4 is composed of two plates 4a and 4b, and a pair of rails 6 that are long in the radial direction of the frame 1 are provided on the facing surfaces of the plates 4a and 4b. A sliding member 8 provided on the upper part is movably attached. A screw shaft 9 provided inside the arm 4 is screw-engaged with the sliding member 8, and by rotating the screw shaft 9, the sliding member 8 moves in the radial direction of the frame 1.

In addition, on the upper portion of the arm 4, there is provided a groove 10 with which the rim a engages corresponding to several sizes of the wheel A.
It is formed concentrically with the center of the frame 1, and is centered with respect to the frame 1 by engaging the wheel A with the corresponding groove 10. As shown in FIG. 3, the wheel A is fixed by moving the sliding member 8 to bring the hook 7 into contact with the outer periphery of the rim a, pressing the wheel A from three directions and pressing it onto the arm 4. To do.

Inside the inner frame 3, as shown in FIG.
The sleeve shaft 12 is rotatably attached through the sleeve shaft 12, and the rotary shaft 1 is fitted in a fitting hole 34 provided at the upper end of the sleeve shaft 12.
The lower part of 3 is fitted so that it can be inserted and removed freely. This rotating shaft 13
The sleeve shaft 12 and the sleeve shaft 12 are integrally rotated by a key 14 which is a rotation stopping means.
A screw hole 31 is formed in the bottom portion of No. 4.

A handle 15 is provided at the lower end of the sleeve shaft 12,
Torque transmission mechanism 16 that transmits to the rotating shaft 13 of the handle
Is provided. As shown in FIGS. 1 and 2, the torque transmission mechanism 16 has a worm wheel 17 attached to the lower end of the sleeve shaft 12, and a worm 18 rotatably supported by a bracket 19 provided on the inner frame 3. Has a structure in which a handle 15 is connected to one end of a shaft extending from the worm 18 via a universal joint 20.
3 is rotated.

As shown in FIGS. 1 and 2, a support member 21 is rotatably attached to the upper end of the rotary shaft 13 via a shaft 22. The support member 21 includes a stopper portion 23 that can be engaged with the upper end of the rotary shaft 13, and the rotation angle of the support member 21 with respect to the rotary shaft 13 is increased by the engagement of the stopper portion 23 and the upper end of the rotary shaft 13. Limited. And
Normally, as shown in FIGS. 2 and 4, when the operating rod 24 is attached to the support member 21 by tilting in one direction, the operating rod 2
4 is held in the forward and downward inclined state.

As shown in FIGS. 5 and 6, the operating rod 24 is a rod-shaped body having a square cross section, and a pushing portion 25 bent at an acute angle with respect to the axis is formed at one end thereof. A pin 27 having a sphere portion 26 at its tip is attached to the pushing portion 25 with some play in the length direction. On the other hand, the operating rod 2
As shown in FIG. 7, a raised portion 28 having a substantially elliptical cross section is formed at the other end of the pin 4, and a pin 29 having a tapered tip is movable in the axial direction. Installed. These pins 27 and 29 act as a cushioning material when pushing each end between the tire B and the wheel A, and prevent scratches on the surface of the tire or the wheel.

This embodiment is constructed as described above, and the operation will be described below.

The tire exchanging device is stored in a general household with the legs 5 of the frame 1 folded or carried in a car.

When the tire is replaced, as shown in FIGS. 2 and 3, the legs 5 are set up and the frame 1 is installed on the ground or the like, and the rim a of the wheel A is supported and fixed to the upper part of the arm 4.

In this case, the rim a of the wheel A and the beat portion b of the tire B
If there is a strong contact between the
Separate them before pushing in in step 4. This can be done in the manner shown in FIG. That is, a ring 30 having a diameter slightly larger than the diameter of the wheel A is placed on the upper portion of the tire B along the wheel A, and the ring 30 is moved downward by using the screw shaft 33 screwed into the screw hole 31 inside the sleeve 12. To the inner peripheral portion of the tire B to apply pressure. As a result, the close contact state between the two can be separated.

To remove the peeled tire B from the wheel A, the screw shaft 33 is removed from the sleeve shaft 12 and the rotary shaft 1 is used instead.
3 is inserted, the raising portion 28 of the operating rod 24 is pushed in the gap between the tire B and the wheel A, and a part of the bead portion b of the tire B is lifted from the wheel a. Let In that state, operate the handle 15 to rotate the rotary shaft 1.
When 3 is rotated, the operating rod 24 moves along the outer circumference of the wheel A, and the tire B is pulled out from the rim a as the movement of the operating rod 24 proceeds. Then, the tire B can be completely removed from the wheel A with the rotary shaft 13 rotating once.

On the other hand, in order to mount the tire B on the wheel A, as shown in FIG. 4, the operating rod 24 is attached to the support member 21 so that the pushing portion 25 side inclines forward and downward. A part of the bead portion b of B is pushed into the rim a of the wheel A, and then the handle 15 is operated to rotate the rotary shaft 1
Rotate 3. As a result, the tire B is operated by the operation rod 24.
Is pushed along with the movement of, and is pushed completely into the rim when it makes one rotation.

During such tire replacement, since the rotation of the rotating shaft 13 is transmitted from the handle by the meshing of the worm wheel and the worm, the returning force applied from the tire to the rotating shaft is blocked at the meshing part and transmitted to the handle and the frame. To be prevented. Therefore, the detaching operation can be performed with a small force, and the rotation of the handle can be surely transmitted to the rotating shaft without firmly fixing the frame to the floor surface or the like, and stable replacement work can be performed.

In the tire attaching / detaching work as described above, when the mounting of the wheel A is not accurately centered with respect to the center of the frame 1, the supporting member 21 is appropriately rotated and the pushing amount of the operation rod 24 is increased. Since it is automatically adjusted, you can work without any problems.

〔effect〕

As described above, according to the present invention, since the operation rod can be rotated around the rotary shaft by the manual operation of the handle to attach and detach the tire, the tire replacement work can be efficiently and easily performed.

In addition, since the rotating shaft and the handle are connected through the meshing of the worm wheel and the worm, the returning force from the tire is blocked at the meshing part so as not to be transmitted to the handle and the frame, so stable attachment and detachment operation is possible. In addition to being able to be carried out, it is not necessary to fix the frame to the floor surface or the like, and there is an advantage that it can be used in a general home or carried in a car or the like.

Further, the rotation shaft can be inserted into and removed from the sleeve shaft connected to the handle, and the sleeve shaft is formed with a screw hole so that the screw shaft can be used to press the wheel mounting portion of the tire. Therefore, the contact state between the tire and the wheel can be easily peeled off, and there is an effect that efficient replacement work can be performed.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a first view.
Fig. 3 is a cross-sectional view taken along the line I-I, Fig. 3 is a cross-sectional view taken along the line II-II, Fig. 4 is a cross-sectional view showing the tire being pushed in, and Fig. 5 is a perspective view showing the operating rod. Fig. 6, Fig. 6 and Fig. 7 are sectional views taken along the lines III-III and IV-IV of Fig. 5, respectively, and Fig. 8 shows a working state of peeling the adhesion between the wheel rim and the bead portion of the tire. It is sectional drawing shown. DESCRIPTION OF SYMBOLS 1 ... Frame, 13 ... Rotating shaft, 15 ... Handle, 16 ... Torque transmission mechanism, 21 ... Support member, 24 ... Operation rod, 25 ... Push-in section, 31 ... Screw hole, 34 ... Fitting hole.

Claims (1)

[Scope of utility model registration request] 1. A sleeve shaft perpendicular to a wheel support surface is rotatably provided at the center of a frame on which a tire wheel is supported and fixed, and the rotary shaft is removably fitted into the upper end of the sleeve shaft. A fitting hole is provided, rotation preventing means for the rotating shaft is provided in the fitting hole, a screw hole is formed at the bottom of the fitting hole, and a worm wheel is attached to the lower end of the sleeve shaft. , A worm attached to a frame and connected with a handle is meshed, a support portion capable of supporting the operation rod in a forward and downward inclined state is provided at the upper end of the rotary shaft, and a foldable leg is attached to the frame. A tire changing device characterized by the above.