JP7181548B2 - Lifting device for changing tires - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Distributing flyers on September 6, 2018 at each dealership of Daihatsu Motor Co., Ltd. nationwide

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire changing lifting device.

Conventionally, a tire changing lifting device used when changing a tire of a vehicle such as an automobile includes traveling wheels such as casters, a hand-push handle for traveling for moving the tire toward and away from the vehicle, Some have provided a foot pedal for extending the hydraulic cylinder to raise the tire and a release pedal for shortening the hydraulic cylinder to lower the tire (see, for example, Patent Document 1).

JP 2013-1248 A

However, conventional lifting devices for changing tires require manual operation for moving the tire in the front, rear, left, and right directions to move the tire toward and away from the vehicle, and foot operation for moving the tire up and down. There was a problem that it was complicated, and a problem that it was dangerous because the operator had to move his line of sight widely.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a lifting device for changing a tire that allows easy and safe operation of traveling forward, backward, left and right, and lifting and lowering.

A lifting device for changing a tire according to the present invention comprises a machine base having traveling wheels, a support column erected on the back side of the machine base, a hand push handle for traveling horizontally arranged in the left-right direction, and a tire. A lifting device for changing a tire, comprising an air cylinder for lifting and a cylinder operation part for operating the air cylinder , wherein a member storage box storing operation members is provided on the strut part, and the above The pushing handle is arranged in a shape projecting left and right outward from the right and left side walls of the member storage box, and the pushing handle itself is provided with the cylinder operating portion.
Further, a machine base having running wheels, a column standing on the back side of the machine base, a hand push handle for running arranged horizontally in the left-right direction, and an air cylinder for raising and lowering the tires are provided. In the tire change lifting device, a member storage box storing operation members is provided on the strut portion, and the push handle has a pair of left and right grip portions, and the grip portions are attached to the member. The compressed air flow path connected to the air cylinder is opened by rotating one of the grips around the left and right horizontal axis. , the channel state for cylinder extension operation and the channel state for cylinder contraction operation are switched.
A rocking lever that can be gripped together with the other grip is provided in the vicinity of the other grip. It is configured to adjust the expansion and contraction speed of the.

According to the present invention, it is possible for the operator to operate the vehicle to move forward, backward, left and right, and to move the vehicle up and down by hand. . A worker can safely change a tire without having to move his line of sight (line of sight) greatly. The entire device can be made smaller and lighter. The device has a simple structure and can be easily manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows one form of embodiment of the lifting-and-lowering apparatus for tire exchange of this invention. FIG. 4 is a side view of a lowered state; FIG. 11 is a side view of a raised state; It is a perspective view showing an example of a lifter. It is a sectional front view of a cylinder operation part and its vicinity, (a) is a principal part sectional front view, (b) is a principal part sectional front view in the state where one grip part was bent. FIG. 4 is a cross-sectional side view of a cylinder operating portion and its vicinity. FIG. 4 is a cross-sectional plan view of a cylinder operating portion and its vicinity; FIG. 4 is an operation explanatory diagram, in which (a) is an operation explanatory diagram of a cylinder operating portion, and (b) is an operation explanatory diagram of a compressed air flow path; FIG. 4 is an operation explanatory diagram, in which (a) is an operation explanatory diagram of a cylinder operating portion, and (b) is an operation explanatory diagram of a compressed air flow path; FIG. 4 is an operation explanatory diagram, in which (a) is an operation explanatory diagram of a cylinder operating portion, and (b) is an operation explanatory diagram of a compressed air flow path; FIG. 4 is an operation explanatory diagram, in which (a) is an operation explanatory diagram of a cylinder operating portion, and (b) is an operation explanatory diagram of a compressed air flow path; FIG. 4 is an operation explanatory diagram, in which (a) is an operation explanatory diagram of a cylinder operating portion, and (b) is an operation explanatory diagram of a compressed air flow path;

The present invention will be described in detail below based on the illustrated embodiments.
As shown in FIGS. 1 to 3, the tire changing lifting device according to the present invention includes a table (mounting table) 1 on which a tire T is placed in an upright posture, and a lifter (elevator body) 2 for lifting the table 1. and has.
The tire T is fitted on a wheel, and is replaced (attached to and detached from) a vehicle such as an automobile or a truck (not shown).

The table 1 has a frame structure, and includes a tire mounting portion 11 on which the tire T is mounted, a support leg portion 18 having the tire mounting portion 11 fixed to the upper portion thereof, and a support leg portion 18. It has a plurality of table running wheels 19 such as casters attached to the lower end of the table and a table running handle 10 .

The tire mounting portion 11 includes a pair of left and right roller portions 12 tilted forward and upward for supporting the lower part of the tire T in the upright position from both the left and right sides and from below, and supports the upper part of the front surface of the tire T in the upright position. It has a leaning portion (reclining portion) 13.
The support leg portion 18 has four (plurality of) legs, and a table travel wheel 19 is attached to the lower end of each leg portion.
The table 1 can be operated by an operator (tire changing worker) holding a handle 10 to lightly move the tire T forward, backward, left and right, and between the tire storage place and the tire changing work place. It is convenient when transporting the tire T.

As shown in FIGS. 1 to 4, the lifter 2 includes a plurality of traveling wheels 29 such as casters attached to the lower portion of a frame-shaped machine base 25, and a pantograph-type lifter mounted on the machine base 25 so as to be vertically telescopic. (link type) elevating mechanism 27, extendable air cylinder 28 connected to elevating mechanism 27, hand push handle 20 for running attached to machine base 25, compressed air pump, compressed air tank, etc. and an air inlet portion 26 for receiving air to which an air hose connected to a compressed air supply source can be detachably attached.

In FIG. 4, the lifter 2 is provided with a push handle 20 that can be held by the operator in a standing posture and a member storage box 60 on a support 25d standing on the back side of the machine base 25. .
The push handle 20 has a pair of left and right grip portions 20a and 20b arranged horizontally in the left-right direction. The pair of grips 20a and 20b are arranged to protrude left and right from left and right side wall portions of the member storage box 60, respectively.

First, when raising and lowering the tire T, the tire T is placed on the table 1 as shown in FIG. Then, the table 1 on which the tire T is placed and the lifter 2 in the lowered state (shortened state) of the elevating mechanism 27 are relatively (mutually) approached in the front-rear direction, as shown in FIG. The upper part 27a of the lifting mechanism part 27 of the lifter 2 is arranged below the tire placing part 11 of the table 1 (the upper part 27a of the lifting mechanism part 27 is arranged so that the table 1 straddles it). state.

Then, as shown in FIG. 3, the air cylinder 28 of the lifter 2 is extended from the lifting preparation state to bring the lifting mechanism 27 into the lifted state (extended state), and the tire T is lifted together with the table 1 . Also, by shortening the air cylinder 28 of the lifter 2, the lifting mechanism 27 is brought into a lowered state, and the tire T can be lowered together with the table 1. FIG.
By elevating (vertically moving) the elevating mechanism 27, the tire T can be aligned in the vertical direction with respect to the wheel mounting portion (hub) of the lifted vehicle.

When the operator grips the handle 20 of the lifter 2 and moves it forward, backward, leftward, and rightward, the lifter 2 travels forward, backward, leftward, and rightward, and aligns the tire T with respect to the vehicle in the forward, backward, leftward, and rightward directions. can.
In the present invention, the "hand push" of the push handle 20 is not limited to the operation of pushing with the operator's hand, but also includes the operation of pulling and moving with the hand.

A cylinder operation portion S for operating the air cylinder 28 (operating the lift mechanism portion 27) is provided on the push handle 20 itself and near the push handle 20. As shown in FIG.
As shown in FIGS. 5 and 6, one grip portion 20a of the push handle 20 is connected to a directional switching valve V for switching the flow direction of compressed air in the compressed air flow path (circuit).
In other words, one grip portion 20a itself serves as a cylinder operation portion S for operating the air cylinder 28 through operation of the directional switching valve V. As shown in FIG.

First, one grip portion 20a is attached to one end portion 64a of an operation connecting rod 64, which is rotatably held about a left-right horizontal axis La, so as to be swingable about a front-rear horizontal axis Le (the operation connecting rod 64 can be freely bent against).
One grip portion 20a includes a cylindrical first grip member 61 and a cross section fixed to the base end portion of the first grip member 61 and pivotally attached to one end portion 64a of the operation connecting rod 64 in an externally fitted manner. A U-shaped connecting member 63 is provided.
One end portion 64a of the operation connecting rod 64 is arranged to protrude left and right outward from one of the right and left side walls of the member housing box 60. As shown in FIG.

In the free state, one grip portion 20a is held in a left-right horizontal posture with the connecting member 63 coming into contact with the lower edge of one end portion 64a of the operating connecting rod 64. As shown in FIG.
As shown in FIG. 5(b), when the operator (tire changer) swings the distal end portion of the first grip member 61 upward by a predetermined bending angle θ, the base end of the first grip member 61 is bent upward. 64a of one end portion 64a of the operation connecting rod 64, and assumes an inclined standing posture in which rocking is prevented. When the operator releases the first grip member 61 (releases the operating force), it is configured to return to the left-right horizontal posture by its own weight.

In addition, one grip portion 20a can be rotated around the left-right horizontal axis La in a bent state, so that the operating force from the operator can be amplified (torque can be increased), and the rotating operation can be easily performed even with a weak operating force. Become. Further, according to the preference of the operator, it is also possible to turn one of the grip portions 20a (like the accelerator of a motorcycle) while maintaining the left and right horizontal posture.
The bending angle θ is preferably 45 degrees or more and less than 90 degrees. If it is less than 45, there is a possibility that the torque increasing effect during the turning operation is small (the operability is not greatly improved compared to the case where the turning operation is performed in the left-right horizontal posture). If the angle exceeds 90 degrees, it becomes difficult to return to the left-right horizontal posture by its own weight. In addition, in FIG. 6, one grip portion 20a is shown in an upright posture.

The operation connecting rod 64 and the directional switching valve V are interlocked with each other via a link mechanism portion 70 .
The link mechanism portion 70 includes a first link member 71 having a base end fixed to the operation connecting rod 64 in an external fit manner, and a base end fixed to an operation rotating portion Va of the direction switching valve V in an external fit manner. One end (upper end) is pivotally attached to the distal end of the second link member 72 and the first link member 71, and the other end (lower end) is pivotally attached to the distal end of the second link member 72. It is a parallel link type provided with a connecting link member 73 that
The second link member 72 is composed of a valve operating lever fixed to the operating rotary portion Va of the directional switching valve V. As shown in FIG. The operation rotating portion Va is rotatable about a left-right horizontal valve rotation axis Lg.

Here, the directional switching valve V has four connection ports 51, 52, 53, and 54, and is manually operated in a first flow path state, a closed state, and a second flow path state. It is a 3-position type with 4 ports that can be switched freely, and is a closed center type that is closed in the middle (middle) of the flow switching.

In FIG. 6, when one grip portion 20a is in a predetermined reference position in a vertical posture in side view, the tip of the first link member 71, the connecting link member 73, and the tip of the second link member 72 are , is disposed at a predetermined vertical intermediate position (reference position), and the directional switching valve V is configured to be in a closed state.
When one grip portion 20a is rotated from the reference position in one direction (forward) around the left-right horizontal axis La, the distal end portion of the horizontal first link member 71, the connecting link member 73, The tip of the second link member 72 is lowered to a predetermined lower position, and the directional switching valve V is configured to be in the first flow path state.
Further, when one grip portion 20a is rotated from the reference position in the other direction (backward) around the left-right horizontal axis La, the distal end portion of the horizontal first link member 71, the connecting link member 73, The tip of the second link member 72 is at a predetermined upper position, and the directional switching valve V is configured to be in the second flow path state.

Further, an elastic biasing member 74 for returning to the reference position is provided for elastically biasing one grip portion 20a to return from the pivoted position to the predetermined reference position.
The elastically biasing member 74 is two torsion springs (torsion coil springs), and when the connecting link member 73 is lifted (during or after lifting), it is elastically biased downward to reach the upper-lower intermediate position (reference position). ), and a second spring 74B for returning to the vertical intermediate position by resiliently urging upward when the connecting link member 73 descends (during or after descending). ing.
The base ends of the first and second springs 74A and 74B are fixed to a fixed portion in the member storage box 60, and the tip ends contact with contact portions protruding from the connecting link member 73 to one of the left and right sides to provide elastic force. It is configured so as to apply the urging force to the connecting link member 73 .

That is, by returning the connecting link member 73 to the reference position, the one grip portion 20a is returned to the reference position. When the operator weakens or releases the turning force applied to the one grip 20a, the one grip 20a is returned to the reference position by the resilient biasing member 74 (the direction switching valve V is closed). so that it becomes).
Further, when the operator rotates the one grip portion 20a, the resistance (load) of the resilient biasing member 74 is received, and a sudden rotation operation can be prevented.

Next, as shown in FIGS. 5 and 7, the swing lever 21 provided near the other grip portion 20b of the hand push handle 20 is operated to change the air flow rate of the compressed air in the compressed air flow path (circuit). It is connected to a flow control valve B for allowing In other words, the rocking lever 21 is used as a cylinder operation part S for operating the air cylinder 28 through the operation of the flow control valve B. As shown in FIG.

The other grip portion 20b is a cylindrical second grip member 62 fixed to the other left and right side walls of the member storage box 60 so as to protrude left and right outward.
The rocking lever 21 has its tip portion side protruding left and right outward through an elongated hole-shaped opening penetrating through the other left and right side wall portions of the member housing box 60, and is connected to the other grip portion 20b. They are arranged so that they can be gripped together.

The flow rate control valve B has a knob-type adjusting rotating portion Bb for controlling the flow rate.
The flow rate control valve B includes a first flow rate control valve B1 and a second flow rate control valve B2. Bb is arranged face-to-face in the vertical direction and is rotatable (on the same axis) around a vertical rotation axis Lc. The first flow control valve B1 and the second flow control valve B2 are ball valves of the same standard (same parts).

A base end portion 21b of the rocking lever 21 is formed in a horizontal plate shape and arranged between the first flow rate control valve B1 and the second flow rate control valve B2 (between the upper and lower sides) to It is fixed to the adjusting rotating portion Bb of B1, B2.
The swing lever 21 is swingable about the vertical pivot axis Lc of the adjustment rotary portion Bb. By operating one swing lever 21, the first flow control valve B1 and the It is possible to synchronize the two flow control valves B2 to change the air flow rate (by the same amount at the same time).

Then, at the lever reference position (lever forward position) where the tip of the rocking lever 21 is farthest from the other grip 20b (within the range where it can be gripped together with the other grip 20b), the flow control valve It is configured so that B is closed.
Also, at the handle approach position (lever rear position) where the tip of the swing lever 21 is closest to the other grip 20b (within the range where it can be gripped together with the other grip 20b), the first and first The two flow control valves B1 and B2 are configured to be fully open.

Further, as shown in FIG. 7, a lever return spring 75 is provided to constantly elastically urge the swing lever 21 forward so that the swing lever 21 is at the lever reference position.
In other words, when the operator weakens or releases the operating force on the swing lever 21, the swing lever 21 swings back to the lever reference position (the air flow rate becomes zero).
The lever return spring 75 is a tension coil spring, one end of which is connected to the swing lever 21 and the other end of which is connected to a fixed portion inside the member housing box 60 .
Appropriate resistance (load) is applied by the lever return spring 75 when the rocking lever 21 is rocked (gripped) to the handle approach position, and the rocking position (grip amount) of the rocking lever 21 can be finely adjusted. . That is, the expansion/contraction speed of the air cylinder 28 (the lifting speed of the lifting mechanism 27) can be finely adjusted, and the height position can be adjusted with high accuracy.

Here, the member storage box 60 accommodates operation members such as the directional switching valve V, the flow control valve B, the link mechanism portion 70, the resilient biasing member 74, the lever return spring 75, and the like.
By providing the cylinder operation part S near the push handle 20 itself and near the push handle 20, the above-mentioned operating members can be arranged close to each other (collected in one place), the structure can be simplified, and the assembly can be simplified. and piping become easier.

Next, the compressed air flow path (circuit) will be described.
As shown in FIGS. 8 to 12, the directional switching valve V has an inflow connection port 53 connected to an external compressed air supply source and an outflow connection port 54 connected (opened) to the outside air via a silencer. ing.
The first connection port 51 of the direction switching valve V is connected to the extension connection port 28a on the pressing side of the double-acting air cylinder 28 via the first flow control valve B1.
The second connection port 52 of the direction switching valve V is connected to the contraction connection port 28b on the retraction side of the air cylinder 28 via the second flow control valve B2.

As shown in FIG. 8(a), when one grip portion 20a and the swing lever 21 are in the standard position, the directional switching valve V and the first and second flow control valves B1, B1 and B1, as shown in FIG. 8(b) B2 is the closed state, and the air cylinder 28 is in the retracted state (the lifting mechanism 27 of the lifter 2 is in the lowered state).

As shown in FIG. 9(a), when one grip portion 20a is rotated forward from the reference position, the direction switching valve V is switched to the first flow path state as shown in FIG. 9(b). The compressed air flow path is in a cylinder extension operation flow path state.

Then, as shown in FIG. 10(a), in the state of the cylinder extension operation channel (the state in which one grip portion 20a is rotated forward from the reference position), the rocking lever 21 is moved together with the other grip portion 20b. When the rocking lever 21 is gripped and moved to the handle approach position, the first and second flow control valves B1 and B2 are fully opened as shown in FIG. From the first connection port 51 of the air cylinder 28 through the first flow control valve B1 to the extension connection port 28a of the air cylinder 28, compressed air flows from the contraction connection port 28b of the air cylinder 28 to the second flow control valve B2. , to the second connection port 52 of the directional control valve V, and discharged to the outside through the silencer, and the air cylinder 28 is extended. In other words, the elevating mechanism 27 operates to ascend.

Furthermore, in the state of the cylinder extension operation channel, as shown in FIG. Then, as shown in FIG. 11(b), the first flow rate control valve B1 and the second flow rate control valve B2 are synchronized to change the air flow rate of the compressed air flow path.
The first flow rate control valve B1 and the second flow rate control valve B2 restrict the air flow rate by the same amount, making the amount of air flowing into the air cylinder 28 equal to the amount of air flowing out of the air cylinder 28. Adjust the extension speed of the air cylinder 28 by decreasing the flow rate. That is, the ascending speed of the ascending/descending mechanism 27 is adjusted.
By swinging the swing lever 21, the operating speed of the air cylinder 28 (elevating mechanism 27) can be adjusted steplessly, and the lift position (height position) of the tire T can be easily finely adjusted. .

Thereafter, although not shown, when the tire T is raised to a desired height position, if the operating force to the rocking lever 21 is released, the rocking lever 21 is returned to the reference position by the lever return spring 75 and the first - The second flow rate control valves B1 and B2 are closed, and the extension of the air cylinder 28 (lifting of the elevating mechanism 27) stops. When the operating force applied to one grip portion 20a is released, the second spring 74B returns the grip portion 20a to the reference position, closing the directional control valve V and stopping the expansion of the air cylinder 28. FIG. The order of releasing the operating force to the one grip portion 20a and the rocking lever 21 (returning to the reference position) is arbitrary.

When shortening the air cylinder 28 (lowering the elevating mechanism 27), as shown in FIG. 12(a), one of the grips 20a is rotated backward from the reference position, resulting in FIG. 12(b). As shown, the directional control valve V is switched to the second flow path state and the compressed air flow path is in the cylinder shortening flow path state.

Although not shown in the drawings, in the state of the cylinder shortening operation channel (the state in which one grip portion 20a is rotated backward from the reference position), the rocking lever 21 is gripped together with the other grip portion 20b, and rocked. When the lever 21 is moved to the handle approaching position, the first and second flow control valves B1 and B2 are fully opened, and compressed air flows through the second connection port 52 of the directional control valve V through the second flow control valve B2. Compressed air from the extension connection port 28a of the air cylinder 28 flows through the first flow control valve B1 to the first connection port 51 of the direction switching valve V. The flow is exhausted to the outside through the silencer, and the air cylinder 28 shortens. That is, the elevating mechanism 27 is lowered.

Further, when the rocking lever 21 is rocked to the front-rear intermediate position in the state of the cylinder shortening operation channel, the air flow rate of the compressed air channel can be changed in the same manner as when the rocking lever 21 is raised. shortening operation speed (lowering speed of the lifting mechanism 27) can be adjusted. When the operating force applied to the other grip portion 20b is released, the other grip portion 20b is returned to the reference position by the first spring 74A, the directional control valve V is closed, and the contraction of the air cylinder 28 is stopped. The order of release of the operating force to the other grip portion 20b and swing lever 21 (return to the reference position) is arbitrary.

In other words, the expansion/contraction speed of the air cylinder 28 (the lifting speed of the lifting mechanism 27) is adjusted by the amount of swinging back and forth (the amount of gripping) of the swing lever 21. FIG.
Also, when the first and second flow control valves B1 and B2 are in the non-closed state and the one handgrip portion 20a is moved from the one side rotation position to the other side rotation position, it is temporarily brought to the reference position. Since the directional switching valve V is closed (via the reference position), the lifting and lowering of the lifting mechanism 27 is temporarily stopped, and the lifting operation and the lowering operation can be safely switched.

In addition, the lifter 2 has a pedal-operated floor lock for preventing travel by the travel wheels 29, and can supply compressed air that has flowed in from the air inlet 26 to air tools such as air guns and air impacts (illustration (omitted) work air supply port, a holder (cylindrical part) for storing air work tools, a work tool storage part (not shown) such as a hook part for hanging air work tools, and a nut It has a shallow box-shaped (not shown) tire replacement parts storage section with an upper opening that can store tire replacement parts such as.

In addition, since it is equipped with an air inlet 26 to which high-pressure air is supplied (received) from an external air supply source such as an existing air compressor or air tank in an automobile manufacturing plant or maintenance plant, the entire device is lightweight and compact. can be done. 1 to 7, an air pipe connecting the air inlet portion 26, the direction switching valve V, the flow control valve B, and the air cylinder 28 is omitted from illustration.
Also, although not shown, the cylinder operating portion S may be provided only on the push handle 20 itself, or may be provided only near the push handle 20 .

In the present invention, the design can be changed, and the tire mounting portion 11 may be provided on the upper portion 27a of the lifting mechanism portion 27 of the lifter 2 (the lifter 2 and the table 1 may be integrated). The lift mechanism section 27 is not limited to a pantograph type structure, but may be of a linear reciprocating type using a guide rail, a structure using a doglegged link or the like, or the like. Alternatively, the lift mechanism 27 may be lifted when the air cylinder 28 is shortened, and the lift mechanism 27 may be lowered (lowered position) when the air cylinder 28 is extended. The operation connecting rod 64 and the first and second grip members 61, 62 may be in the shape of a solid rod, pipe, strip, or the like.
In order to facilitate the explanation of the present invention, the tire T mounted on the tire mounting portion 11 is placed face-to-face with respect to the tire mounting portion of the vehicle on which the tire is to be replaced. The direction approaching the vehicle is referred to as the front, and the direction away from the vehicle is referred to as the rear. Therefore, the posture in use is not limited based on the direction.

As described above, the tire changing lifting device of the present invention includes the traveling wheels 29, the hand push handle 20 for traveling, the air cylinder 28 for raising and lowering the tire, and the cylinder operation section S for operating the air cylinder 28. , wherein the cylinder operation part S is provided on the push handle 20 itself and/or in the vicinity of the push handle 20. (hands) can be operated to move forward, backward, left and right by the traveling wheels 29 and to move up and down by the air cylinder 28, and the operation for the operation is efficient, and the tire change work can be easily and quickly performed. be able to. A worker can safely change a tire without having to move his line of sight. The entire device can be made smaller and lighter. The structure of the device is simple and can be manufactured easily and quickly (inexpensively). In addition, the operator can raise and lower the robot only with the fingertips (without the need to move the body greatly) while maintaining the upright posture, thereby reducing the burden on the operator.

Further, the tire changing lifting device is provided with a traveling wheel 29, a hand-push handle 20 for traveling, and an air cylinder 28 for lifting and lowering the tire. , 20b, and by rotating one of the grip portions 20a about the left-right horizontal axis La, the compressed air flow path connected to the air cylinder 28 is brought into a state of a flow path for cylinder extension operation. , and the cylinder shortening operation flow path state, so that the operator can operate the traveling wheel 29 in the front, back, left, and right, and the up and down operation with the air cylinder 28 at hand (hand) of the operator. Therefore, the tire changing work can be performed easily and quickly without wasteful operation. A worker can safely change a tire without having to move his line of sight. The entire device can be made smaller and lighter. The structure of the device is simple and can be manufactured easily and quickly (inexpensively). In addition, the operator can raise and lower the robot only with the fingertips (without the need to move the body greatly) while maintaining the upright posture, thereby reducing the burden on the operator. It is easy to operate (simple) and can intuitively switch between ascending and descending.

In the vicinity of the grip portion 20b on the other side, a rocking lever 21 that can be gripped together with the grip portion 20b on the other side is provided. Since the speed of expansion and contraction of the air cylinder 28 is adjusted, the height position of the tire T can be finely adjusted with respect to the vehicle, and the height can be set (positioned) with high accuracy. The operation can be performed intuitively and easily, and the lifting speed can be easily adjusted without removing the line of sight (line of sight) from the tire T.

20 push handle
20a One grip
20b Other grip
21 Swing lever
28 Air cylinder
29 Traveling wheel La Left and right horizontal axis S Cylinder operating part

Claims (3)

A machine base (25) having running wheels (29) , a strut (25d) erected on the back side of the machine base (25), and a hand-push handle for traveling horizontally arranged in the left-right direction ( 20), an air cylinder (28) for raising and lowering a tire, and a cylinder operation part (S) for operating the air cylinder (28), wherein
A member storage box (60) for storing operation members is provided on the support (25d),
The push handle (20) is arranged to protrude left and right outward from left and right side walls of the member storage box (60),
An elevating device for changing a tire, wherein the cylinder operating portion (S) is provided on the push handle (20) itself. A machine base (25) having running wheels (29) , a strut (25d) erected on the back side of the machine base (25), and a hand-push handle for traveling horizontally arranged in the left-right direction ( 20) and an air cylinder (28) for lifting and lowering a tire, comprising:
A member storage box (60) for storing operation members is provided on the support (25d),
The push handle (20) has a pair of left and right grips (20a) and (20b),
The grip portions (20a) and (20b) are arranged to protrude left and right outward from left and right side wall portions of the member storage box (60),
By rotating one of the grips (20a) about the left-right horizontal axis (La), the compressed air flow path connected to the air cylinder (28) is brought into the cylinder extension operation flow path state. and a cylinder shortening operation channel state. A swing lever (21) that can be gripped together with the other grip portion (20b) is provided near the other grip portion (20b). 3. A lifting device for changing a tire according to claim 2, wherein the expansion and contraction speed of said air cylinder (28) is adjusted by changing the flow rate of air in the passage.

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