JP2963894B1 - Vehicle tire replacement assistance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive auxiliary device with a simple structure capable of carrying out vehicular tire replacement and transportation work in simple light work in the auxiliary device used in demounting and transporting a tire for a passenger car, a truck, a tractor or the like by manpower. SOLUTION: An auxiliary device for vehicular tire replacement is provided with two generally parallel tire supporting rods 8 projected in a fork shape, an operating handle 1 for lifting a tire by means of a lever action, and wheels 5 located at both the sides of a connecting part for the tire supporting rods and the operating handle. The operating handle 1 is formed at a downward U-shaped or reverse U-shaped pipe frame. Each tire supporting rod 8 is provided with an upwardly projected circular arc-shaped-tire-supporting surface 17 in the direction along its projected direction. The use of the tire supporting surface 17 in the upwardly projected circular arc shape easily retains the vertical position of the tire on the tire supporting rods tilted by means of the lever action. Almost horizontally laying the operating handle 1 supports the sides of the tire by means of the frame-like operating handle to drop no tire in the course of transportation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus used for attaching and detaching and transporting tires of vehicles such as passenger cars, trucks, and tractors. The present invention relates to a device having no power for facilitating the work. In this specification, not only a rubber outer peripheral member provided with a tread forming an outer peripheral portion of a wheel but also an assembly (wheel assembly) of the outer peripheral member and a member called a wheel or hub made of metal holding the outer peripheral member is provided. The term tire is used to refer to the term.

[0002]

2. Description of the Related Art Depending on the material and tread pattern of a tire, there are tires suitable for a road surface to be driven and tires not suitable. 2. Description of the Related Art As a tire used for traveling on a road provided with a normal vehicle, a normal tire used when there is no snow and a snow tire used when snow is covered are known. Normal tires have high grip on concrete or asphalt road surfaces, have low abrasion, have low rolling resistance, and have low running noise. However, normal tires are very slippery on snowy roads,
It is almost impossible to drive safely. Therefore, during snowfall, tires of vehicles are replaced with snow tires only in winter.

[0003] The performance of a normal tire is far superior to that of a snow tire on a snow-free road surface. On the other hand, once snow falls, the force of gripping the road surface (snow surface) of the normal tire is extremely reduced. It is desirable to change tires at an appropriate time, but it is difficult to predict when snowfall starts and ends, depending on the year. For this reason, it is common for drivers to change tires on a daily basis, such as when snow falls, and now that automobiles have become widespread, weak elderly people and women must change tires themselves. Things that do not happen regularly occur.

[0004] When replacing a tire, it is necessary to lift the frame of the vehicle with a jack, separate the tire from the ground surface, remove a nut that fixes the tire, and insert and remove the tire with bolts protruding from the axle. It is. At this time, the tire has to be lifted, which is a heavy burden for a weak operator.

[0005] Japanese Patent Application Laid-Open No. 1-132401 discloses a device capable of lifting and lowering a tire by using a leverage as a device capable of attaching and detaching and transporting the tire from the axle at the time of tire replacement. A device that can be transported with a tire mounted on a fork has been proposed. In this conventional apparatus, as shown in FIG. 8, two parallel projecting cylinders 22 forming a fork for supporting a tire are provided on both sides of a horizontal frame 21. And an outer cylinder 23 which can be freely rotated. Wheels 24 are provided at both ends of the frame 21, and auxiliary wheels 25 are further provided behind the wheels 24. A handle 26 extending obliquely upward is provided at the center of the frame 21, and a roller 27 is provided at the base of the handle so as to contact the side surface of the tire.

In this conventional apparatus, the protruding cylinder 22 is inserted between the tire lifted from the ground surface and the ground surface, and the handle 26 is tilted. Insert and remove the tire from the axle bolt. When mounting the tire, it is necessary to match the mounting hole provided in the wheel with the bolt of the axle. However, since the weight of the tire is supported by the protruding cylindrical outer cylinder 23 and the roller 27, the tire is manually rotated on the device. Can be done. The removed tire is the steering wheel 26
By pushing or pulling, it can be transported while placed on the protruding cylinder 22.

[0007]

Although this conventional device has been considered relatively well, it is very difficult to work alone when attempting to change tires with this device. The main reason is that the protruding cylinder 22 tilts as the tire is moved up and down as a necessary result of using the leverage to lift the tire. That is, if the tire supported by the protruding cylinder 22 is to be lifted high in accordance with the position of the bolt on the axle, the lifted tire falls down to the handle 26 side. Therefore, unless one person pushes down a steering wheel and lifts a tire, and another person holds a tire in a vertical position, the tire cannot be changed successfully. If the height of the mounting hole of the tire and the bolt of the vehicle axle just match when the protruding cylinder 22 is horizontal, it is necessary to repeatedly operate the jack to adjust the lifting height of the vehicle several times. Must be performed, and the work becomes very complicated.

Further, in the above-mentioned conventional apparatus, when the removed tire is transported, the tire is transported in a state of being stood on the protruding cylinder 22, so that the tire is always held with one hand so that the tire does not fall down and fall off the apparatus during transportation. This operation requires a considerable force when the tire is large, so that the operation of transporting the tire is not always easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional apparatus, and the replacement and transport of tires of a vehicle can be performed with simpler and lighter work, and the structure is simpler than that of the conventional apparatus. It is an object to provide an auxiliary device for a vehicle tire that can be provided at low cost.

[0010]

Means for Solving the Problems] tires assist apparatus for a vehicle according to claim 1 is substantially parallel 2 projecting forked
In a tire replacement assistance device for a vehicle including a tire support rod 8, a handle 1 for lifting a tire by leverage, and wheels 5 located on both sides of a connecting portion between the tire support rod and the handle, an operation handle 1 is provided. Is formed by a downward U-shaped or inverted U-shaped pipe frame, and the tire support rod 8 is provided with an upwardly convex arc-shaped tire support surface 17 in a direction along the projecting direction.

According to a second aspect of the present invention, in the vehicle tire replacement assisting device of the first aspect, the tire supporting rod 8 includes the center rod 2 and the rotatable supports 6, 1 which can freely rotate around the axis thereof.
5 and 18, wherein the center rod 2 is formed of a pipe material integral with the operation handle 1.

[0012]

The tires of ordinary passenger cars, trucks and the like intended to travel on a maintained road have a substantially flat tread in the tire width direction. Therefore, in the above-described conventional device in which the direction along the projection direction of the tire support rod forms a linear tire support surface, the shape of the tire support rod generated when the tire is lifted by leverage is transmitted to the tire as it is, Tilt the tire on the tire support rod. When trying to maintain the vertical position of the tire on the inclined tire support rod, a large force is required to maintain the tire in the vertical position because the shoulder portion of the tire is supported by the tire support rod. is there.

On the other hand, in the device of the present invention, since the tire supporting surface 17 of the tire supporting rod is formed in the shape of a convex arc in the projecting direction of the tire supporting rod, the tire is placed on the tire supporting rod with a small force. When the posture of the tire is made vertical on the tire support rod tilted by the leverage action, the contact position between the tire tread and the tire support rod deviates from the center of gravity of the tire by a small amount (see FIG. 2). Therefore, the vertical posture of the tire can be maintained by only lightly supporting the tire with one hand, and the lifting of the tire to the desired height and the maintenance of the vertical posture of the tire at the lifted position can be performed alone.

When the tire support surface 17 of the tire support rod is formed in the above-described arc shape of the convex center, the stability of the tire on the tire support rod is reduced. In the conventional device described above, the decrease in stability causes a problem when the tire is transported. In the device of the present invention, the tire is transported while the operation handle 1 is tilted and the side surface of the tire is supported by the operation handle (FIG. 2 imaginary lines). Since the operation handle 1 has a downward U-shape or an inverted U-shape, if the operation handle 1 is tilted almost horizontally, the side surface of the tire is supported by the frame-shaped operation handle and is extremely stably held. Since the transport of the tire is performed in this state, there is no fear that the tire will fall off even if the tire is not pressed during transportation.

If it is desired to avoid a low posture when transporting the tire, a pull cord 11 may be provided above the operation handle (see FIG. 3). Further, if the auxiliary wheels 14 are provided on the upper part of the operation handle 1, the tires can be transported by four wheels or three wheels of the wheels 5 and the auxiliary wheels 14 (see FIG. 4). Further, by providing such an auxiliary wheel 14, the operability when the operation handle 1 is raised by inserting a hand under the operation handle in a tilted state is also improved.

The rotary supports 6, 1 provided on the tire support rod
5 and 18 are effective in rotating the tire on the tire support rod 8 and facilitating the work of matching the bolt of the axle with the mounting hole of the tire, similarly to the outer cylinder 23 of the conventional device. At this time, by forming the central rod 2 of the tire support rod integrally with the end of the pipe forming the operation handle, the apparatus of the present invention can be manufactured in a simple process at low cost.

[0017]

FIG. 1 is a view showing a first embodiment of a tire replacement assistance device according to the present invention. A pipe material is bent into a U-shape to form a frame-shaped operation handle 1, and both ends thereof are bent into a U-shape to integrally form a center rod 2 of two tire support rods. Each center rod 2 is bent upward in an arc shape along the protruding direction. Operation handle 1
A horizontal rod 3 is welded to a portion where the central rod 2 and the central rod 2 are connected so as to connect the base ends of the central rods 2 on both sides. A bracket 4 is welded to the base end of the operation handle 1 and a wheel 5 is supported in a free rotating state. A flexible pipe 6 coated with a lubricant is inserted into the center rod 2, and a cap 7 is fitted at the tip of the center rod 2 to prevent the flexible pipe 6 from falling off. The center rod 2 and the flexible pipe 6 form a tire support rod 8. A disc-shaped bracket 9 is fixed to both upper ends of the operation handle 1, and a drawstring 11 is attached to the bracket by connecting both ends to the bracket.
The first embodiment has the simplest structure, and the device of the present invention can be provided at low cost. Flexible pipe 6
Although it is not as large as a rotating ball or a spindle type outer cylinder of the embodiment described later, it is freely rotatable around the center rod 2 and serves to facilitate the rotation of the tire on the tire support rod 8.

FIG. 2 and FIG. 3 are explanatory views showing a method of using the tire replacement assisting device. When replacing the tire of a passenger car, the vehicle body frame is lifted with a jack, the tire 31 is separated from the ground surface, and the nut fixing the wheel 32 of the tire is removed from the bolt 33 of the axle. While rolling the wheel 5, the tire supporting rod 8 is slid under the tire 31, the operation handle 1 is depressed, the tire is slightly lifted, and the center of the mounting hole 34 of the wheel and the bolt 33 of the axle are aligned. To the front side to pull out the wheel 32 from the bolt 33. Missing tire 31
Is transported to a desired place in a state of leaning against the operation handle 1 as shown by the imaginary line in FIG. 2 or while being placed on the operation handle as shown in FIG.

FIGS. 4 and 5 show a second embodiment of the present invention. In the second embodiment, the operation handle 1 is formed by a horizontal pipe 12 at the upper end and two vertical pipes 13. The horizontal pipe 12 protrudes on both sides of the vertical pipe 13, and an auxiliary wheel 14 is mounted on this protruding portion. As in the first embodiment, the center rod 2 is formed by bending the lower end of the vertical pipe 13 and further bending in the upwardly projecting arc shape in the projecting direction of the center rod. A plurality of spherical rotating bodies 15 are inserted through the center rod 2 made of this pipe material. The center hole 16 of the rotating body 15 is formed in a drum shape having a curvature corresponding to the arc shape of the center rod 2, and is considered so as to be able to rotate smoothly on the bent center rod. This spherical rotating body (rotating ball) 15 is a synthetic resin molded product,
It can be manufactured inexpensively, and the rotation resistance on the center rod 2 is small. The envelope surface of the upper part of the plurality of rotating balls fitted into the central rod 2 bent in the upward convex arc shape forms an upward convex arc-shaped tire support surface 17 along the projection direction of the tire support rod. .

FIG. 6 shows a main part of a third embodiment of the present invention. In the third embodiment, the center rod 2 of the tire support rod is linear, and a spindle-shaped outer cylinder 18 is inserted through the center rod 2 so as to be freely rotatable. In the case of such a structure, it is possible to form a tire convex surface 17 of a convex center arc shape for supporting the tire without bending the center rod 2, and between the center rod 2 and the rotating outer cylinder 18. By interposing a needle bearing or the like, the rotation of the outer cylinder 18, that is, the rotation of the tire supported by the outer cylinder, can be extremely reduced. FIG.
As shown in FIG. 7, the spindle-shaped outer cylinder 18 may be formed by axially attaching a plurality of short cylindrical members whose outer diameters sequentially change to the center rod 2 of the tire support rod.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a side view of the first embodiment showing a state in which a tire is supported.

FIG. 3 is a perspective view showing a transport state of a tire.

FIG. 4 is a perspective view of a tire replacement assistance device according to a second embodiment.

FIG. 5 is an enlarged sectional view of a rotating body.

FIG. 6 is a perspective view of a tire replacement assistance device according to a third embodiment.

FIG. 7 is a side view showing a modification of the third embodiment.

FIG. 8 is a perspective view of a conventional tire replacement assistance device.

[Description of Signs] 1 Operation handle 2 Center rod 5 Wheel 6 Flexible pipe 8 Tire support rod 15 Rotating body 17 Tire support surface 18 Outer cylinder

Continuation of front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60B 29/00 B60B 30/10

Claims (2)

(57) [Claims] 1. Two substantially parallel tire support rods (8) protruding in a fork shape , an operation handle (1) for lifting a tire by leverage, and positions on both sides of a connecting portion between the tire support rod and the operation handle. In the tire replacement assist device for a vehicle having wheels (5), the operating handle (1) is formed by a downward U-shaped or inverted U-shaped pipe frame, and the tire supporting rod (8) extends along the projecting direction. Upwardly convex arc-shaped tire support surface (1
7) A vehicle tire replacement assistance device, comprising: 2. The tire support rod (8) includes a center rod (2) and a rotation support (6, 15, 18) freely rotatable around its axis. The tire replacement assistance device for a vehicle according to claim 1, wherein the device is formed of an integral pipe material.