JPH062803Y2 - Locking mechanism for vertical arm in tire attaching / detaching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vertical arm lock mechanism in an arm swing type tire attaching / detaching device.

(Prior Art) Although various types of tire attaching / detaching devices are known, the device covered by the present invention is for attaching / detaching relatively small-diameter tires such as passenger car tires and other small trucks. As shown in FIGS. 2 and 3, a horizontally arranged rotary table is provided, and a vertical arm attached to the arm is located on the rotary table. Then, the tire is removed from the fixed wheel placed on the rotary table, and the tire is mounted on the wheel in reverse, but the tire claw is attached to the lower end of the vertical arm. Engage the bead of the tire and turn the turntable.

Therefore, the tire claw must be moved to a predetermined position and fixed at that position according to the size and width of the tire. The tire claw is attached to the lower end of the vertical arm and can be moved to any position by moving the vertical arm up and down or swinging the arm on which the vertical arm is mounted. Has been done by manual steering wheel operation. That is, the arm must be swung to a predetermined position, and swinging the arm generally moves the arm tip with the right hand. However, when the position is determined, the stopper bolt is adjusted, and then the right hand is moved. Release it and change to the handle provided at the tip of the arm, push down the vertical arm to a certain height with your left hand, and rotate the handle at a predetermined position where the tire claw can engage with the tire to lock the vertical arm. Has been done.

In this way, the positioning of the arm and the determination of the position (height) of the vertical arm cannot be performed in one working process. This means that the positioning work of the tire claw is of course troublesome, but Adopting two steps by changing the holding poses a problem that it is difficult to accurately position the tire claw. On the other hand, the tire claw is positioned where it hits the flange of the wheel and the vertical arm is locked, but the tire claw must not contact the flange, that is, if the rotary table and the wheel are rotated in the contact state, the flange is Will be scratched,
It is necessary to give some clearance and lock.

However, this operation is not easy with the conventional handle type lock mechanism, and the tire claws are in contact with the flange, or conversely, a gap larger than necessary is provided.

(Object of the Invention) As described above, the conventional tire attaching / detaching device has the above-mentioned problems with respect to the positioning of the tire claws. The present invention is intended to solve these problems, and provides a lock mechanism for a vertical arm that can easily and accurately position the tire claw at a predetermined position.

(Structure of the present invention) The lock mechanism of the vertical arm according to the present invention has the following features in order to solve the above problems. That is, in order to lock the vertical arm, a lock plate that engages with the vertical arm is provided, a lock hole is penetrated through the lock plate, and the vertical arm is inserted into the lock hole and placed on the arm. Has been done. One end of the lock plate is used as a fulcrum, and the other end is lifted and attached so as to be tiltable. The tilt of the lock plate causes the corner portion of the lock hole to engage with the peripheral side surface of the vertical arm. On the arm
Prevent downward movement.

In the present invention, for workability and correct positioning of the tire claw, an air cylinder is attached between the arm and the lock plate so that the other end of the lock plate is lifted by the air cylinder, and the fulcrum side is fixed to the bolt. It is worn. An adjusting nut and a stopper nut are screwed to the bolt so that the amount of upward and downward movement of the lock plate can be adjusted, that is, the operating point at which the air cylinder operates to become the other end. The fulcrum side is positioned on the adjustment nut before the lifting of the lock plate, but if the other end is lifted, the lock plate tilts and the vertical arm engages with the lock hole. When the piston rod of the air cylinder is further pressed, the tilt angle of the lock plate remains unchanged and the fulcrum side rises until it hits the stopper nut, and the vertical arm is also lifted as the lock plate rises. That is, by slightly raising the vertical arm, the tire claw can be separated from the flange of the wheel and the tire can be attached or detached without contacting the flange.

Hereinafter, embodiments of a lock mechanism for a vertical arm according to the present invention will be described in detail with reference to the drawings.

(Embodiment) FIG. 1 shows an embodiment of the lock mechanism of the present invention, in which 1 is an arm, 2 is a vertical arm, 3 is an air cylinder, and 4 is a lock plate. The vertical arm 2 is attached to the tip of the arm 1 so that it can be moved up and down, and a head 5 is attached to the upper end of the vertical arm 2 and a tire claw 6 is attached to the lower end thereof. A spring 7 is interposed between the arm 1 and the arm 1. Therefore, the vertical arm 2 is always kept in a state of being lifted by the spring force of the spring 7, and when the tire claw 6 is set to a predetermined height, the head 5 is pushed down to lower the lock plate 4. Tilt and lock the vertical arm 2. The lock plate 4 uses a bolt 8 attached to the end of the arm 1 as a fulcrum, while the air cylinder-3 is arranged on the side of the operating point and a piston rod 9 of the air cylinder-3 is operated to raise the operating point. ing. A lock hole 10 is formed in the middle of the lock plate 4, the vertical arm 2 is inserted through the lock hole 10, and if the lock plate 4 is inclined, a corner portion 11 of the lock hole 10 is formed.
If a and 11b come into contact with the peripheral side surface 12 of the vertical arm 2 and a larger force is applied to the action point side, the corner portion 11a, by the lever principle,
The contact surface pressure between 11b and the peripheral side surface 12 becomes high, and a large frictional force is generated to lock the vertical arm.

By the way, the bolt 8 serving as a fulcrum of the lock plate 4 is provided with an adjusting nut 13 and a stopper nut 14, and the stopper nut 14 is fixed to the upper end of the bolt 8, while the adjusting nut 13 has a free height. It is screwed so that it can be changed to. The lock plate 4 is interposed between the nuts 13 and 14, but a certain distance (H) between the lock plate 4 and the adjusting nut 13.
Has a gap corresponding to. The gap is generated between the adjusting nut 13 when the vertical arm 2 is locked,
Before locking, the fulcrum side of the lock plate 4 is supported on the adjusting nut 13. Therefore, at this stage, there is a gap between the stopper nut 14 and the action point side is lifted by the action of the piston rod 9 and is inclined by a certain angle so that the corner portions 11a, 11b are formed on the peripheral side surface 12 of the vertical arm 2. When the piston rod 9 is further projected, the lock plate 4 rises until it abuts on the stopper nut 14 while keeping the inclination angle constant. Similarly, the vertical arm 2 is also lifted by the same rising distance. 2 and 3 are overall views of the tire attaching / detaching device, and FIG. 1 is an A in FIG.
FIG. The operation of the device using the lock mechanism of the present invention is basically the same as that of the conventional device, but the arm 1
Is swung from the neutral axis MM by an appropriate angle θ, and the tire claw 6 is brought into contact with the flange of the wheel 15 and locked at that position. In this case, generally, the arm 1 is swung by the angle θ with the right hand, the head 5 of the vertical arm 2 is pressed to push down the vertical arm 2, and the angle θ of the arm 1 is fixed when the tire claw 6 contacts the flange. At the same time as adjusting a stopper bolt (not shown), the air cylinder-3 is operated by pedal operation to lock the vertical arm 2 by the lock plate 4. Then, by rotating the rotary table 16, the tire 17 attached to the wheel 15 can be removed, and conversely, the tire 17 can be attached to the wheel 15. Of course, the details of the procedure for attaching and detaching the tire are the same as those in the conventional method, and the description thereof will be omitted.

As described above, in the lock mechanism of the vertical arm of the present invention, the vertical arm movably mounted on the arm is inserted into the lock hole provided in the lock plate, and one end of the lock plate is used as a fulcrum. With the other end as an action point, the piston rod of the air cylinder is pressed at the action point to incline the lock plate, and the vertical arm is locked by the frictional force between the corner portion of the lock hole and the peripheral side surface of the vertical arm. The following effects can be obtained with.

(Effect) (1) Since the vertical arm lock mechanism of the present invention is operated by the air cylinder, swing the arm end with one hand and swing it to an appropriate angle, press the head of the vertical arm to lower it, and use the pedal to operate the vertical arm lock mechanism. Since the vertical arm can be completely locked, not only the workability is good, but also the tire claw is positioned at the optimum position, so that the tire can be smoothly attached and detached.

(2) In the lock mechanism, the fulcrum of the lock plate is supported by bolts with a certain gap between the adjustment nut and the stopper nut, and the lock plate and the vertical arm are lifted by the gap together with the locking action of the air cylinder. The tire claw set against the flange of the wheel maintains a gap between the wheel and the flange, so that the tire can be attached and detached without being scratched by the tire claw even when the wheel is rotated. Also, the gap can be freely controlled by the adjusting nut.

[Brief description of drawings]

FIG. 1 is a specific example of the vertical arm lock mechanism of the present invention, and FIGS. 2 and 3 are schematic views of a tire attaching / detaching device.
The figure shows a plan view and FIG. 3 shows a front view. 1 ... Arm, 2 ... Vertical arm, 3 ... Air cylinder-, 4 ... Lock plate, 5 ... Head, 6 ... Tire claw, 7 ... Spring, 8 ... Bolt, 9 ... Piston rod, 10 ... Lock hole, 11 ... Corner, 12 ... Surface, 13 ... Adjustment nut, 14 ... Stopper nut, 15 ... Wheel, 16 ... Rotary table, 17 ... Tire.

Claims (1)

[Scope of utility model registration request] 1. A rotary table for fixing a wheel is mounted, and a vertical arm is arranged in a direction perpendicular to a surface of the rotary table. The vertical arm is attached to an end of the arm so as to be movable up and down. In the tire attaching / detaching device in which the arm is swingable for aligning a tire claw provided at a lower end in accordance with a wheel diameter fixed on a rotary table, a lock plate having a lock hole through which the vertical arm is inserted is vertically attached. Place the arm in the arm end with the arm inserted, support the fulcrum at one end with a bolt, and attach an adjustment nut and a stopper nut to the bolt to give a slight gap between the lock plate and the stopper nut. And the adjustment nut is screwed in at an appropriate position, and the piston rod of the air cylinder is made to act on the action point on the other end. The lock mechanism of the vertical arm in the device.