JP3122066B2 - Tire jack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire jack for raising and lowering a tire when replacing a tire of an automobile, and more particularly to a tire jack which is convenient for replacing a tire of a four-wheel drive vehicle, a truck, a passenger car and the like.

[0002]

2. Description of the Related Art In general, a tire of an automobile is formed by fitting a connection hole formed in a tire wheel to several bolt screws of a tire connection portion provided on an axle, and fixing the connection hole with a bolt or the like. Attached to the car.
For this reason, when replacing a tire, a process of lifting the replacement tire, aligning the bolt screw of the tire connection portion with the connection hole of the tire wheel, and fitting the bolt screw is required. Therefore, there has been a tire jack having a complicated configuration using hydraulic pressure or the like, which is dedicated to tire replacement of a large special vehicle, heavy equipment, or the like.

[0003]

On the other hand, there has been no tire jack dedicated to four-wheel drive vehicles, trucks, passenger cars and the like. Further, there is a tire jack which supports the tire with rollers and rotates and aligns the position, as in JP-A-6-156005, but the structure is complicated and it is difficult to handle, which is not practical. Therefore, for example, in the case of changing tires of a large truck, although it is not easy to lift the tires alone, the tires are actually changed without a tire jack, and the physical labor of the changer is large. In addition, if the tire is replaced without a tire jack, the connection hole formed in the tire wheel and the bolt screw at the tire connection part attached to the axle of the car may be incompletely pushed even if it is incompletely fitted. There is a possibility that the thread of the bolt screw may be broken. In view of the above, an object of the present invention is to provide a tire jack dedicated to tire replacement which has a simple structure and is easy to handle.

[0004]

As a result of repeated studies, the present inventor has provided a tire jack in which a plurality of sets of pantographs which expand and contract with a common screw bar are mounted on a machine equipped with casters. The above object is achieved by providing a tire jack provided with one tire supporting portion that supports the tire so that it can be rolled upright on the upper part of the plurality of pantographs along a vertical plane parallel to the screw rod. Found to be solved.

In this tire jack, a replacement tire is erected on a tire support along a vertical plane parallel to a threaded rod, and the tire is rolled to align the tire with a tire connection portion of an automobile. It can be carried out.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings. Example 1 FIG. 1 shows a tire jack manufactured for the purpose of changing tires of a four-wheel drive vehicle. The tire jack is provided with two sets of pantographs 2 vertically extending and contracting by a single screw rod 1 on a machine base 4 provided with four casters 3, and furthermore, these two sets of pantographs 2A, 2B A tire support 6 for welding the tire 5 upright along a vertical plane parallel to the threaded rod 1 and supporting the tire 5 to be rolled is welded to the upper part of the tire 5.

[0007] The tire support portion 6 in this embodiment is manufactured using an iron plate having a thickness of 2 mm, and its dimensions are 20 cm in width and 60 cm in length. A tire support of this size is particularly convenient for tire replacement in a four-wheel drive vehicle. In addition, a bent portion 7 having a width of about 3 cm is formed at a lower end of the side end in the length direction of the tire support portion for improving strength and safety.

The tire jack of the present invention can use a conventionally known pantograph (pantograph jack). Each of the pantographs 2A and 2B is made using four links 13, and each of the pantographs is made up of individual pantographs. The length of the link 13 is 20 cm. The two sets of pantographs can be simultaneously expanded and contracted by using a single screw rod 1, and the tire support 6 is always kept horizontal.
A rotation lever 11 for rotating the screw rod is attached to one end of the screw rod. Note that, in the present application, the common screw rod includes one in which the screw rods of the individual pantographs are connected, welded and connected to each other, or a single screw rod is used. As in the present invention, a tire jack having two sets of pantographs 2A and 2B that can be simultaneously expanded and contracted allows the tire 5 placed on the tire support 6 to stand upright along a vertical plane parallel to the screw rod. Even if the tire jack rolls, the tire jack does not tilt or fall, and the tire can be stably and safely aligned with the vehicle tire connecting portion. In addition, a stopper (not shown) is provided on a side of each caster 3 attached to a lower portion of the machine base, and by operating this, the caster can be brought into a rotatable state and a non-rotatable state. Can be. The tire jack of this embodiment can be used for a tire (including a tire wheel) having a diameter of 50 to 110 cm and a weight of 100 kg or less, and particularly, a diameter 50 used for a four-wheel drive vehicle, a small truck, a medium truck, a passenger car, and the like. Suitable for tires up to 80 cm in weight and 40 kg or less.

Next, an example of a method of using the tire jack of this embodiment will be described with reference to FIG. First, the tires requiring tire replacement are removed from the car. Next, the replacement tire 5 is erected on the tire support portion 6 of the tire jack along a vertical plane parallel to the screw rod 1, and the tire falls down to the vicinity of the tire connection portion 10 attached to the axle of the automobile. Push and move while supporting with your hand so that it does not fall.
Then, by rolling the tire 5 along a vertical plane parallel to the screw rod 1, the connection between the connection hole 8 formed in the tire wheel and the bolt screw 9 provided in the tire connection portion 10 is performed. The alignment is performed by turning the jack rotation lever 11 to adjust the height and rolling the tire on the tire support 6. At this time, if necessary, the caster 3 may be rolled to move the entire tire jack. After the connection hole 8 of the tire wheel is fitted into the bolt screw 9 of the tire connection portion 10, the tire is replaced by fixing with a bolt.

Further, in the tire jack of the present invention, as shown in FIG. 3, several tires 5 can be mounted on the tire supporting portion 6 in an overlapping manner. Therefore, it is convenient even when several tires are taken out from a warehouse, for example.

Embodiment 2 FIG. 4 shows a tire jack for a large vehicle according to a second embodiment of the present invention. The tire jack is provided with three sets of pantographs 2A, 2B, and 2C that expand and contract vertically with one connected screw rod 1 on a machine base 4 provided with six casters 3. At the top of the pair of pantographs, the tire 5 is supported upright along a vertical plane parallel to the threaded rod 1 so that it can roll.
One tire support 6 is provided. In this embodiment,
The link 13 of the pantograph is 15 cm long.

The dimensions of the tire supporting portion 6 in this embodiment are 25 cm in width and 80 cm in length. The thickness of the iron plate was 3 mm for the tire support portion and 2 mm for the other portions. In addition, a bent portion 7 having a width of about 4 cm is formed below the side end portions in the length direction and the width direction of the tire support portion, and a height 2 near the side end portion in the length direction.
A bumper 14 cm is welded to prevent the tire from falling down. In addition, a disk-shaped rotating lever for rotating the screw rod was used. In the present embodiment, it is designed to withstand a higher weight than in the first embodiment. Therefore, the tire jack of the present embodiment has a diameter of 50 to
It can be used for tires (including tire wheels) weighing 110 cm and weighing 100 kg or less, but is particularly suitable for tires having a diameter of 75 to 110 cm and weighing 110 kg or less used for medium-sized trucks, heavy-duty trucks, buses, and the like.

An example of a method of using the tire jack for replacing a tire of a heavy truck is shown below. First, the length of the inclined plate is 1m, height 20cm, width 30cm
Prepare the slope. Then, this slope is arranged adjacent to a tire jack whose height is set to about 20 cm.
At this time, the slope is disposed adjacent to the side in the length direction of the tire support where the wheel stop 14 is not attached. Then, load the tire on the tire jack while rolling the tire by hand. At this time, the caster 3 is in a non-rotatable state by operating the stopper, and the tire jack cannot move. The subsequent tire replacement method can be performed in the same manner as described in the first embodiment.
The tire jack according to the present embodiment makes it easy to change tires of a large truck, which can be accomplished by years of experience and great effort.

Embodiment 3 FIG. 5 shows a tire jack according to an embodiment of the present invention. In the present embodiment, the tire mounting portion of the tire support portion 6 is designed to be lower than the position where the tire support portion is attached to the upper part of the pantograph, and the tire can be easily mounted on the tire jack.

The present invention is not limited to the above embodiment. Therefore, the tire support portion 6 may be a metal plate, a fiber-reinforced plastic plate, a wooden plate, or the like, in addition to the one using the iron plate. The method of attaching the tire support to the upper part of the pantograph is not limited to welding as in the above embodiment, and any conventionally known connection means such as bolts can be arbitrarily adopted. In addition, the width of the tire support is not limited to the size of the tire support 6 shown in the above embodiment, and is preferably 8 to 3
0 cm, more preferably 10-25 cm, optimally 15-2
5 cm, the length of the tire support is preferably 35-10
0 cm, more preferably 40-80 cm, optimally 52-6
It can be designed to a size of 5 cm. Further, the size of the pantograph to be used can be arbitrarily selected.
It is preferred to use a pantograph of 5 cm, more preferably 15-21 cm.

[0016]

According to the present invention, the attachment of the tire support to the tire jack makes it possible to accurately and safely align the replacement tire and the tire connection portion of the vehicle at the time of tire replacement. . Further, the tire jack of the present invention has a simple structure, so that it is easy to handle and excellent in durability. Furthermore, it is also used as a truck that can transport several tires in piles.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tire jack of the present invention.

FIG. 2 is a perspective view showing a method of using the tire jack of the present invention.

FIG. 3 is a view showing another method of using the tire jack of the present invention.

FIG. 4 is a perspective view of a tire jack according to a second embodiment of the present invention.

FIG. 5 is a side view of a tire jack according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw bar 2A, 2B, 2C Pantograph 3 Caster 4 Machine stand 5 Tire 6 Tire support part 7 Folding part 8 Connection hole 9 Bolt screw 10 Tire connection part 11 Rotating lever 12 Tire wheel 13 Link 14 Car stop

Claims (3)

(57) [Claims] 1. A tire jack in which a plurality of pantographs extending and contracting up and down by a common screw bar are mounted on a machine equipped with casters, wherein a tire is mounted on an upper part of the plurality of pantographs. Upright along a vertical plane parallel to
A tire jack comprising two tire support portions. 2. A wheel stop that extends upward is formed at an edge of the tire support that extends in the width direction, and the rolling of the tire supported by the tire support is stopped by the wheel stop. The tire jack according to claim 1, wherein: 3. The tire support portion includes a first surface attached to an upper portion of the pantograph, and a second surface extending downward from one edge extending in a length direction of the first surface. , A third surface extending in the horizontal direction again from the lower end of the second surface, and the tire is supported on the upper surface of the third surface. The tire jack according to claim 1.