JP7310049B2 - tire lifter - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire lifter used in an automobile repair shop or the like to remove or attach a tire from a car such as a passenger car or truck lifted by a car lift.

Normally, when replacing tires, repairing punctures, checking wheel balance, rotating tires (regular position exchange), etc. at an automobile repair shop, the car is lifted with a car lift or jack to remove and remove the tires. . At this time, a tire lifter as disclosed in Patent Documents 1 to 3, for example, is used to lower the removed heavy tire to the ground or lift it up.

In general tire lifters including those disclosed in the above-mentioned patent documents, a pair of right and left tire receiving rods for receiving a tire are attached to a pole erected on an underframe so as to be able to move up and down. A front wheel caster and a rear wheel caster are provided on the lower surface of the underframe of the tire lifter so that the tire lifter can be moved while freely changing the moving direction. When removing a tire from a lifted automobile, the raised tire bearing bar supports the lower part of the tire, receives the removed tire from the axle, and lowers it to the ground for work. Conversely, when installing a tire, put the tire on the tire receiving rod and lift it up to the axle position.

In order to prevent the tire lifter from tilting forward due to the weight of the tire when the tire is placed on the support bar and lifted up and down, in the conventional tire lifter, the underframe is extended to a lower position near the tip of the tire support bar, and the front wheel caster is attached to the lower surface of the tip. The arrangement balances the tire lifter.

JP 2017-71228 A JP 2013-1248 A Japanese Patent No. 3173700

When using such a conventional tire lifter, there is no problem when working on a car lifted by a car lift on a flat floor. However, in many cases, as shown in FIGS. 4, 5 and 6, the car lift B is installed in a groove 17 formed in the floor surface 16, and when not in use, the upper surface of the top plate 19 faces the floor surface 16. It is stored so as to be flush, and when tires are changed, the automobile C is placed on the top plate 19 and lifted, and the vehicle body is lifted by the auxiliary jack 20 incorporated in the top plate 19 so that the wheels D can be slightly lifted. formed. The tire support bar of the tire lifter is inserted under the wheel D to support the tire while the tire is being attached and detached. Therefore, if a conventional tire lifter is used for a vehicle lifted by such a car lift B, there is a risk that the front wheel will come off the groove 17 opened by raising the top plate 19, making the tire lifter unusable.

Therefore, the present invention solves the above-described problems, and even when tires are attached and detached to and from an automobile lifted on a groove, the tire lifter can be used safely in a well-balanced manner and has a structure that prevents troubles due to derailment. intended to provide

In order to solve the above problems, the present invention has taken the following technical measures. That is, in the tire lifter of the present invention, a tire bearing bar protruding forward is attached to a pole erected on an underframe so as to be vertically movable via an elevating mechanism, and a pair of left and right front wheel casters and a pair of front wheel casters are mounted on the lower surface of the underframe. A tire lifter provided with a rear wheel caster, wherein the front wheel caster is disposed below a position retracted from the base of the tire support rod, and a member serving as a balance weight is located at a position rearward of the pole of the underframe. Auxiliary wheels are provided at positions rearward of the left and right front wheel casters on the lower surface of the underframe.
The auxiliary wheels are preferably provided so as to be slightly raised from the ground when the vehicle normally travels on the ground with the front wheel casters and the rear wheel casters.

Since the tire lifter of the present invention is configured as described above, when a car is lifted by a car lift stored in a groove provided on the floor surface to attach and detach a tire, the front wheel caster of the tire lifter can be placed in the open groove. You can use it conveniently without getting depressed. In addition, since a member serving as a balance weight is placed behind the pole of the underframe, it functions as a balance weight that moves the center of gravity of the tire lifter rearward, and the front wheel casters retreat from the base of the tire support rod. Even when the tire lifter is below the position where the tire lifter is positioned, it is possible to prevent the tire lifter from falling forward due to the weight of the tire when the tire is lifted and lowered, and work can be performed safely in a well-balanced manner. In addition, since auxiliary wheels are provided behind the front wheel casters on the lower surface of the underframe, if the tire lifter accidentally enters the car lift obliquely, one of the front wheel casters will temporarily slip into the groove. Even so, there is an effect that the tire lifter can be prevented from tilting due to being supported by the auxiliary wheels and the rear wheels.

In the present invention, it is preferable that a stopper is provided in front of the front wheel caster and above the underframe for preventing forward movement of the front wheel caster by coming into contact with an obstacle.
As a result, when the stopper comes into contact with the car lift, which is an obstacle, in an elevated state, the front wheel caster cannot move forward any more, and the front wheel caster can be prevented from slipping into the groove formed under the car lift. .
In the present invention, the member serving as the balance weight may also serve as the power source of the lifting mechanism.

1 is a perspective view of a tire lifter according to the present invention; FIG. FIG. 2 is a partial cross-sectional side view of the tire lifter; Explanatory drawing which shows the use condition of the said tire lifter. The partial cross section figure which shows the example of installation of a car lift. The partial cross section side view which shows the state which lifted the motor vehicle with the said car lift. FIG. 4 is a partial cross-sectional side view showing a state in which the wheels of the automobile lifted by the car lift are slightly lifted by an auxiliary jack.

In the following, the details of the invention are explained on the basis of the exemplary embodiments shown in the drawings.
In the tire lifter A according to the present invention, a fork-shaped tire support rod 3 projecting forward from a hollow pole 2 erected on the upper surface of a plate-shaped underframe 1 can be lifted and lowered via a lifting mechanism 4. installed.

In this embodiment, the lifting mechanism 4 is composed of a vertical screw shaft 5 driven by a servomotor M provided in the pole 2, and a slider 6 vertically moved by the rotation of the screw shaft 5. The tire receiving rod 3 is connected to the slider 6 via a connecting rod 8 protruding from the guide long hole 7 . Further, the tire receiving rods 3 are formed as a pair of left and right, and are held by a common mounting plate 9 at their respective root portions. The tire receiving rod 3 is formed of a freely rotatable pipe so that the tire D placed on the upper surface thereof can be easily rotated by hand. Further, a support rod 9a is provided on the upper surface of the mounting plate 9 for supporting one side surface of the tire when the tire D is placed on the tire receiving rod 3 and preventing the tire from falling toward the pole. The pole 2 including the lifting mechanism 4 is arranged behind the front wheel 10 .

A pair of left and right front wheel casters 10 are provided on the lower surface of the underframe 1 . The front wheel caster 10 is arranged below a position retreated from the root portion of the tire receiving rod 3 described above.

Further, in the vicinity of the rear end of the underframe 1, an L-shaped auxiliary support column 12 is provided that connects the upper surface of the underframe 1 and the intermediate portion (in the height direction) of the pole 2. A rear wheel caster 11 is arranged. A commercially available caster with a stopper is used as the rear wheel caster 11 . A battery 13 serving as a power source for the lifting mechanism 4 is placed in a storage case at a position behind the pole 2 on the underframe 1 (preferably near the rear end of the underframe 1). The battery 13 and the auxiliary strut 12 function as a balance weight to prevent the lifter from tilting forward when the tire is placed on the tire receiving rod 3. As shown in FIG. Further, on the outer surface of the corner portion of the auxiliary column 12, an operation panel 14 having a lifting button for operating the lifting mechanism 4, a power switch, etc. is provided. A handle 21 is provided.

Further, a pair of left and right auxiliary wheels 15 are provided slightly behind the left and right front wheel casters 10 (in front of the center of gravity of the pole 2). The auxiliary wheels 15 are preferably provided at a position slightly raised from the ground so as not to impair the running performance of the front wheel casters 10 during normal running. It should be noted that the number of auxiliary wheels 15 may be one.

In addition, the front wheel caster 10 of the tire lifter abuts against an obstacle (specifically, the top plate 19 of the car lift B that has risen) above the underframe 1 on the front side of the tire lifter A ahead of the front wheel caster 10. A stopper 18 is provided to prevent the forward movement of the. In this embodiment, the stopper 18 is made of a vertically extending pipe material and is held by the underframe 1 at its lower end. . It should be noted that the term “above” the underframe 1 here is not limited to being directly above but also includes obliquely above. can be prevented.

The above-mentioned tire lifter A is suitably used when removing or attaching a tire D to a car C lifted by a car lift B stored in a groove 17 on the floor as shown in FIGS. 3 to 6, for example. .
As described above, the car lift B is installed in the groove 17 formed in the floor surface, and is stored so that the upper surface of the top plate 19 is flush with the floor surface 16 when not in use. It is formed so that the automobile C is put on the top plate 19 and lifted when the tire is changed.
At the time of tire replacement, as shown in FIG. 3, the vehicle C is lifted by the car lift B, and the tire lifter A of the present invention is advanced forward with respect to the vehicle C whose wheels are slightly lifted by the auxiliary jack 20, so that the tire support rods 3 are pushed into the tire. Remove from the axle while supporting the tire by inserting it into the underside of D. At this time, since the front wheel caster 10 of the tire lifter A is installed below the position retreated from the root portion of the tire receiving rod, the front wheel caster 10 can be stopped on the floor surface 16 near the side wall of the groove 17, and the groove 17 can be moved. never fall into In addition, a stopper 18 is provided on the front side of the tire lifter A ahead of the front wheel caster 10 to prevent the forward movement of the tire lifter A by coming into contact with the top plate 19 of the lifted car lift, which is an obstacle in front of the front wheel caster. 10 can be reliably prevented from running off into the groove 17. - 特許庁

In addition, in the tire lifter A of the present invention, the battery 13 and the reinforcing strut 12 that serve as the power source for the elevating mechanism 4 are arranged behind the pole 2 of the underframe 1, so that these members and the pole 2 that incorporates the elevating mechanism 4 are placed in the tire lifter. Even if the front wheel caster 10 is below the position retreated from the base of the tire receiving rod 3, the tire lifter tilts forward due to the weight of the tire when the tire is lifted or lowered. You can work safely with good balance.

In addition, by providing the auxiliary wheels 15 behind the left and right front wheel casters 10, if the tire lifter erroneously enters obliquely into the car lift with the raised tire lifter, one of the front wheel casters 10 is temporarily stuck in the groove 17. It is possible to prevent the tire lifter A from tilting by being supported by the auxiliary wheel 15 and the rear wheel 11 even if the tire comes off the wheel.

Although representative examples of the present invention have been described above, the present invention is not necessarily limited to the above embodiments. For example, the elevating mechanism 4 for elevating the tire support bar is not limited to that of the embodiment, and a lifting mechanism employed in a conventional lifter such as a combination of a rack and a pinion or a chain system may be used. can.
Moreover, when the lifting mechanism is not driven by a battery, a heavy object such as metal may simply be placed as a balance weight.
In addition, the present invention can be modified and changed as appropriate without departing from the scope of the claims while achieving the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used in a tire lifter that is used in an automobile repair shop or the like to remove or attach a tire from a car such as a passenger car or truck lifted by a car lift.

A Tire lifter B Car lift C Automobile D Tire 1 Underframe 2 Pole 3 Tire receiving bar 4 Elevating mechanism 10 Front wheel caster 11 Rear wheel caster 12 Auxiliary strut 13 Battery 15 Auxiliary wheel 18 Stopper 19 Top plate of car lift

Claims (4)

A tire lifter in which a tire bearing bar protruding forward is attached to a pole erected on an underframe so as to be able to be raised and lowered via an elevating mechanism, and a pair of left and right front wheel casters and a rear wheel caster are provided on the lower surface of the underframe. and
The front wheel caster is arranged below a position retracted from the base of the tire bearing bar, and a member serving as a balance weight is provided at a position behind the pole of the underframe,
A tire lifter in which auxiliary wheels are provided on the lower surface of the underframe at positions rearward of the left and right front wheel casters. 2. The tire lifter according to claim 1, wherein the auxiliary wheels are provided so as to be slightly raised from the ground when the vehicle normally travels on the ground with the front wheel casters and the rear wheel casters. 3. The tire lifter according to claim 1, wherein a stopper is provided in front of said front wheel caster and above said underframe for preventing forward movement of said front wheel caster by coming into contact with an obstacle. The tire lifter according to any one of claims 1 to 3, wherein a power source of the elevating mechanism is used as the member serving as the balance weight.

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