JPH0717226A - Traction device - Google Patents

Abstract

PURPOSE:To place a shaft to be connected between brackets in its most suitable condition, without being influenced by the thickness of the shaft to be connected. CONSTITUTION:A housing guide is formed in a base 1 fixed to a car body and each one pair of draw bar bracket bodies 8a, 9b are arranged slidably to the housing guide. Each of connecting parts 8b, 9b is formed by extending in the front of the one pair of the draw bar bracket bodies 8a, 9a. A screw shaft 10 is screwed to one side draw bar bracket body 8a and a screw shaft 11 is screwed to the other side draw bar bracket body 9a. The interval between the draw bar bracket bodies 8a and 9a is enlarged and reduced, when the screw shafts 10, 11 are rotated suitably.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a traction device.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing a towing vehicle equipped with a conventional towing device. The towing device 20 is fixed to the rear part of the towing vehicle 21. The towing device 20 includes a base 20a and a pair of upper and lower brackets 2 protruding from the base 20a.
0b and 0b. A connecting hole is formed at the tip of the pair of upper and lower brackets 20b. on the other hand,
A connected shaft 23 is provided on the front side of the towing tractor 22, and a connecting hole is formed at the tip of the connected shaft 23. The towing vehicle 21 and the towing tractor 22 are connected by inserting the tip end of the connected shaft 23 between the pair of upper and lower brackets 20b and connecting the connecting pin 24 to the upper bracket 20.
It is performed by inserting each connection hole from the b side.

By the way, a pair of upper and lower brackets 20b are formed on a base 20a so as to project therefrom, and the base 20a is fixedly mounted on the rear portion of the vehicle body. That is, the height position of the bracket 20b of the towing device 20 was fixed. Therefore, when the vehicle height of the towing tractor 22 tow is different, the height position of the connected shaft 23 may be different from the height position of the bracket 20b. The same applies when the attachment position of the connected shaft 23 is different. In this case, the tip of the connected shaft 23 cannot be interposed between the pair of upper and lower brackets 20b.

Therefore, the applicant of the present invention provides the traction device 20 so as to be movable up and down with respect to the vehicle body, and changes the height position of the traction device 20 according to the mounting height position of the connected shaft 23. It has been proposed that it can be connected to a connected shaft at a certain position (Actual No. Sho 49-71920).

[0005]

By the way, the connected shaft 23 of the towing tractor 22 is composed of a pair of upper and lower brackets 2.
0b and is connected by the connecting pin 24, the thickness of the connecting portion of the connected shaft 23 is equal to the thickness of the pair of upper and lower brackets 2.
The thickness must be less than the 0b interval. However, the thickness of the portion of the connected shaft 23 of the towing tractor 22 interposed between the pair of upper and lower brackets 20b was different for each towing tractor 22.

Therefore, when the thickness of the connected shaft 23 is thicker than the distance between the pair of upper and lower brackets 20b, they cannot be connected. Therefore, it is conceivable to intervene and connect an auxiliary joint member between the connected shaft 23 and the pair of upper and lower brackets 20b, but this is a very troublesome work and requires an auxiliary joint member.

On the other hand, when the thickness of the coupled shaft 23 is much smaller (thinner) than the distance between the pair of upper and lower brackets 20b, a gap is formed between the pair of upper and lower brackets 20b and the coupled shaft 23 is pulled during towing. But I can't dance smoothly between the brackets 20b. Therefore, in order to prevent the dance, it is conceivable to interpose a spacer for eliminating the gap, but this is a very troublesome work and the spacer is required.

The present invention has been made to solve the above problems, and the first object is to reliably interpose the connected shaft between the brackets without being influenced by the thickness of the connected shaft. Another object of the present invention is to provide a traction device that can perform the interposition of the connected shaft in an optimal state.

A second object is, in addition to the first object, to provide a traction device in which the connected shaft can be interposed between the brackets without being influenced by the mounting height position of the connected shaft. .

[0010]

In order to achieve the above object, the invention of claim 1 is fixed to a vehicle body, and a base having a guide portion formed on the front surface, and the guide portion can be slid independently of each other. A pair of drawbar bracket main bodies, a connecting portion extending on the front surface of each of the pair of drawbar bracket main bodies, and a connected body between the pair of connecting portions. A gist of a traction device is composed of a connecting means for connecting a connected body between a pair of connecting portions and a distance adjusting means for sliding a pair of drawbar bracket main bodies to change a distance between the pair of connecting portions. To do.

According to a second aspect of the invention, in addition to the first aspect of the invention, the traction is provided with height adjusting means for sliding the pair of drawbar bracket bodies and changing the height position of the pair of connecting portions. The device is the gist.

[0012]

The gap adjusting means enlarges or reduces the gap between the connecting portions formed on the pair of drawbar bracket bodies. As a result, it is possible to adjust the distance between the connecting portions according to the thickness of the connected body mounted between the connecting portions.

Further, the height adjusting means can appropriately change the height position of the pair of drawbar bracket main bodies. As a result, the height of the connecting portion can be adjusted according to the height of the connected body mounted between the connecting portions.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. FIG. 1 is a perspective view of the traction device. This towing device is fixed to the rear part of the vehicle body of the conventional towing vehicle 21 shown in FIG. The base 1 of the towing device is formed in a substantially square shape, and a plurality of bolt holes 2 (only the left side is shown in FIGS. 1 and 2) are provided on the left and right front sides of the base 1 at predetermined intervals in the vertical direction. There is. By inserting a bolt through the bolt hole 2, the traction device is fixed to the towing vehicle. Then, the bolt holes 2 on both the left and right sides
Inside, a pair of left and right bracket boxes 3 are provided in the vertical direction. Left and right pair of bracket boxes 3
The front ends of the two are bent to face each other, and the inside of the pair of bracket boxes 3 and the front surface of the base 1 form a storage guide 3a. Screw holes 4 are provided on the upper surface and the lower surface of the bracket box 3, and the upper box cover 6 and the lower box cover 7 are screwed together with the bolts 5.
Is fixed to the bracket box 3. Then, in the upper and lower box covers 6 and 7, the accommodation guide 3a
It blocks the upper and lower openings.

An upper drawbar bracket 8 and a lower bracket 9 are arranged on the accommodation guide 3a. Figure 3
As shown in FIG. 3, the bracket main bodies 8a and 9a of the upper and lower brackets 8 and 9 are rectangular parallelepiped, and the accommodation guide 3a
Is slidably disposed along. Bracket body 8
Plate-shaped connecting portions 8b and 9b are formed on the front surfaces of a and 9a so as to project from between the pair of left and right bracket boxes 3. The connecting holes 8c, 9c are formed in the connecting portions 8b, 9b.
9c are formed respectively.

A through hole 8d is formed on the right side of the upper surface of the main body 8a of the upper drawbar bracket 8, and a screw hole 8e is formed on the left side. A screw hole 9e having an inner diameter smaller than the through hole 8d is formed on the right side of the upper surface of the main body 9a of the lower drawbar bracket 9 at a position facing the through hole 8d of the upper drawbar bracket 8. A through hole 9d having an inner diameter larger than the screw hole 8e is formed at a position facing the screw hole 8e of the upper drawbar bracket 8 on the upper left side of the main body 9a of the lower drawbar bracket 9.

A left screw shaft 1 having a male screw formed between the left portions of the upper and lower box covers 6 and 7.
The upper and lower ends of 0 are rotatably supported. The left screw shaft 10 is screwed into the screw hole 8e of the upper drawbar bracket 8 and freely inserted into the through hole 9d of the lower drawbar bracket 9. Between the left side portions of the upper and lower box covers 6 and 7, upper and lower ends of a right screw shaft 11 having a male screw are rotatably supported. The right screw shaft 11 is loosely inserted into the through hole 8d of the upper drawbar bracket 8 and screwed into the screw hole 9e of the lower drawbar bracket 9.

Left and right screw shafts 10, 1
The heads 10a and 11a of No. 1 are projected on the upper surface of the upper box cover 6. The screw shafts 10 and 11 are rotated by rotating the heads 10a and 11a with a spanner or the like. Then, when the left-hand screw shaft 10 rotates clockwise, the upper drawbar bracket 8 screwed with the shaft 10 moves upward along the accommodation guide 3a. On the contrary, when the left screw shaft 10 rotates counterclockwise, the upper drawbar bracket 8 moves downward along the accommodation guide 3a. In this case, in the lower drawbar bracket 9, the left screw shaft 10 has the through hole 9
Since it is not screwed by d, it does not move up and down even if the left screw shaft 10 rotates.

On the other hand, when the right-hand screw shaft 11 rotates clockwise, the lower drawbar bracket 9 screwed onto the shaft 11 moves upward along the accommodating guide 3a. On the contrary, when the right screw shaft 11 rotates counterclockwise, the lower drawbar bracket 9 moves downward along the accommodation guide 3a. In this case, since the right screw shaft 11 is not screwed into the upper drawbar bracket 8 through the through hole 8d, the upper drawbar bracket 8 does not move vertically even if the right screw shaft 11 rotates.

And, the connecting portions 8b of the upper and lower drawbar brackets 8 and 9 which respectively move up and down independently,
The tip connecting portion 15a of the connected shaft 15 attached to the front side of the trailer is mounted between 9b. And the connecting portion 15a
The connecting pin 16 is inserted from above into the connecting hole 15b formed in the above and the connecting holes 8c and 9c formed in the connecting portions 8b and 9b, and the upper and lower drawbar brackets 8 and 9 and the connected shaft 15 are connected.

In this embodiment, the lower surface of the connecting portion 8b of the upper drawbar bracket 8 is formed so as to be flush with the lower surface of the bracket body 8a. Further, the upper surface of the connecting portion 9b of the lower drawbar bracket 9 is formed so as to be flush with the upper surface of the bracket body 9a.
Therefore, when the upper drawbar bracket 8 and the lower drawbar bracket 9 come into contact with each other, the connecting portions 8b and 9b of the drawbar brackets 8 and 9 also come into contact with each other, and the connecting portions 8b and 9b.
The spacing between b is zero.

Next, the operation of the traction device constructed as described above will be described. When the left screw shaft 10 is rotated, only the upper drawbar bracket 8 moves up and down along the accommodation guide 3a. Further, when the right screw shaft 11 is rotated, only the lower drawbar bracket 9 moves up and down along the accommodation guide 3a.

When the upper drawbar bracket 8 and the lower drawbar bracket 9 are at a predetermined distance,
When the left and right screw shafts 10 and 11 are rotated by the same amount in the same direction, the upper and lower drawbar brackets 8 and 9 move up and down while maintaining a distance. Therefore, even if the height position of the connected shaft 15 attached to the trailer to be pulled is deviated from the height positions of the upper and lower drawbar brackets 8 and 9, the height positions of the upper and lower drawbar brackets 8 and 9 are adjusted. Securely connect the connected shaft 1
The connecting portion 15a of No. 5 can be mounted between the connecting portions 8b, 9b of the upper and lower drawbar brackets 8, 9.

The left or right screw shaft 1
When either one of 0 and 11 is rotated in a proper direction by a predetermined amount, the upper and lower drawbar brackets 8 and 9 screwed to the rotated left or right screw shafts 10 and 11 are vertically moved. As a result, the distance between the connecting portions 8b and 9b of the upper and lower drawbar brackets 8 and 9 expands and contracts relative to the rotation direction and the rotation amount. Therefore,
Even if the thickness of the connecting portion 15a of the connected shaft 15 is different, the connected shaft 1 can be reliably connected only by adjusting the distance between the connecting portions 8b and 9b.
The connecting portion 15a of No. 5 can be mounted between the connecting portions 8b and 9b. Moreover, it is possible to optimally set the gap between the connecting portions 8b and 9b and the connecting portion 15a of the connected shaft 15 that is mounted between the connecting portions 15b and 9b. You can tow smoothly without bouncing or dancing at 9.

Further, if the left and right screw shafts 10 and 11 are respectively rotated in appropriate directions by a predetermined amount, the intervals between the connecting portions 8b and 9b and the height positions of the connecting portions 8b and 9b are adjusted. Therefore, the connecting portion 1 of the connected shaft 15
Even if the thickness and height position of 5a are different, the connecting portion 15a of the connected shaft 15 can be reliably mounted between the connecting portions 8b and 9b.

As described above, in this embodiment, the connecting portions 8b and 9 of the upper and lower drawbar brackets 8 and 9 can be obtained by simply operating the left or right screw shafts 10 and 11 as appropriate.
The distance and height position of b can be adjusted. Therefore, the connecting portion 15a of the connected shaft 15 attached to the trailer
The upper and lower drawbar brackets 8 and 9 and the connecting shaft 15 in the optimum state without fail even if the thickness and height position of the connecting pin 15 are different.
6 can be connected.

The present invention is not limited to the above embodiment, but can be modified and embodied as follows. (1) As shown in FIG. 4, forward and reverse rotatable electric motors 17a and 17b are fixed to the upper box cover 6, and the output shafts of the motors 17a and 17b are connected to the left and right screw shafts 10 and 11, respectively. Then, by controlling the rotation of the motors 17a and 17b, the interval adjustment and the height adjustment can be performed without labor. In this case, if the operation switch and the like are provided on the vehicle body near the traction device, they can be adjusted visually.

Further, each electric motor 17a, 17b may be provided on the lower box cover 7 so as not to be directly exposed to rain. Furthermore, the upper and lower box covers 6, 7
When there is no space to install the two electric motors 17a and 17b at the same time, one electric motor 17a is installed on the upper box cover 6 and the other electric motor 17a is installed.
b may be installed on the lower box cover 7.

(2) As shown in FIG. 5, the bracket bodies 8a, 9a of the upper and lower drawbar brackets 8, 9
The screw holes 8f and 9f are formed in the center of the upper surface of the. Then, the screws of the screw holes 8f and 9f are formed so as to be mutually opposite screws. A screw shaft 18 screwed into the screw holes 8f and 9f is rotatably supported on the upper and lower box covers 6 and 7. Since the screws of the screw shaft 18 are screwed into the screw holes 8f and 9f which are mutually opposite screws, they are opposite to each other with the intermediate position as a boundary. When the screw shaft 18 is rotated in one direction, the upper drawbar bracket 8 and the lower drawbar bracket 9 are separated from each other, and when the screw shaft 18 is rotated to the other, the upper drawbar bracket 8 and the lower drawbar bracket 9 are close to each other. Therefore, also in this case, the distance between the connecting portions 8b and 9b can be adjusted. Moreover, there is an effect that the number of parts is small.

Further, the screw shaft 18 may be rotated by an electric motor 19 as shown in FIG. (3) Although the upper and lower drawbar brackets 8 and 9 are arranged vertically in the above embodiment, they may be arranged laterally, that is, left and right depending on the type of the connected shaft. Of course, the traction device shown in FIGS. 4, 5, and 6 may be tilted 90 degrees laterally and fixed to the vehicle body.

(4) Although the traction device is fixed to the rear part of the vehicle body in the above embodiment, it may be fixed to the front part of the vehicle body. (5) In the above embodiment, the embodiment is a towing vehicle.
It may be embodied in other industrial vehicles such as forklifts.

[0032]

As described above in detail, according to the present invention, it is possible to reliably mount the connected shaft between the brackets, and further to mount the connected shaft in an optimum state. Have. Further, there is an excellent effect that the connected shaft can be interposed between the brackets regardless of the mounting height position of the connected shaft.

[Brief description of drawings]

FIG. 1 is a perspective view showing a traction device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a base of the traction device.

FIG. 3 is a perspective view showing configurations of an upper bracket, a lower bracket, and a screw shaft.

FIG. 4 is a perspective view showing another example of the traction device.

FIG. 5 is a perspective view showing another example of the traction device.

FIG. 6 is a perspective view showing another example of the traction device.

FIG. 7 is an overall view showing a traction state of a conventional traction device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base, 3a ... Storage guide, 8 ... Upper drawbar bracket, 9 ... Lower drawbar bracket, 8a, 9
a ... drawbar bracket body, 8b, 9b ... connecting portion,
8c, 9c ... connecting hole, 8d, 9d ... through hole, 8e, 9e
... screw holes, 10, 11 ... screw shafts, 15 ... connected shafts, 16 ... connecting pins.

Claims (2)

[Claims] 1. A base fixed to a vehicle body and having a guide portion formed on the front surface thereof, a pair of drawbar bracket bodies independently slidably arranged on the guide portions, and a pair of drawbar bracket bodies. A connecting part extending between each of the connecting parts extending to the front surface; a connecting means for connecting the connected body between the pair of connecting parts; and connecting the arranged connected body with the pair of connecting parts; Of the drawbar bracket body, and a space adjusting means for changing the space between the pair of connecting parts. 2. The traction device according to claim 1, further comprising height adjusting means for sliding a pair of drawbar bracket main bodies to change a height position of the pair of connecting portions.