JP2003063222A - Tow bar hitch height holding device for trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tow bar hitch height holding device for a trailer capable of improving workability and safety in handling a tow bar and being applied to tow bars of all the trailers by holding a hitch height of the tow bar on a trailer body and reducing load of the tow bar. SOLUTION: This tow bar hitch height holding device 13 holds the tow bar 8 rotatably and pivotally attached to a bearing part 4 provided at a front end part of the trailer main body 1 by a horizontal shaft 10 to a prescribed height. The device 13 is constituted of a torque damper mechanism 15 having a torque shaft 14 fixed to the front end part side of the trailer main body 1 and a supporting body 16 fixed to a base part side of the tow bar 8. The supporting body 16 of the tow bar 8 is abutted and supported on a lower side of the horizontal shaft 10 by a damper arm 17 fixed to the torque shaft 14 of the torque damper mechanism 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailer tober holding device, and more specifically, to maintaining the torch hitch height with respect to a trailer body and reducing the load of the tober to improve workability and safety in handling the tober. The present invention relates to a toberhitch height holding device for a trailer that can be improved.

[0002]

2. Description of the Related Art A conventional trailer of this type is shown in FIGS.
The trailer toe bar a is rotatably pivotally attached to a bearing portion c fixed to the front end side of the trailer body b by a horizontal shaft d fixed to the base side of the tow bar a. Is towed by connecting a towbar hitch e provided at the front end of the towbar a to a hitch on the towing vehicle side. When the trailer is not used, the towbar a is pulled up by the handle f and leaned against the trailer body b side. When the trailer is used, the tober a is supported by the supporting leg g at a predetermined height and is connected to the hitch on the towing vehicle side. When the trailer is moved forward, the supporting leg g is folded by the spring and stored horizontally with the tover a.

[0003]

However, since the towbar a of the trailer has a considerable weight, it leans against the trailer body b when the trailer is not used and the towbar a is pulled when the trailer is used. Not only is there a problem in the safety of the towing work, but when connecting the tober a to the hitch on the side of the towing vehicle while the trailer is supported at its height when the trailer is used, the toe bar a is supported. When docked while being supported by the support leg g, the support leg g frequently breaks due to recoil and impact at that time, and when it is damaged, one person's work requires two people's work, which leads to cost increase. There was a problem that maintenance costs for parts and parts replacement costs were high.

The present invention solves the above-mentioned problems in the prior art. By maintaining the torch hitch height with respect to the trailer body and reducing the load on the tober, workability and safety in handling the tober are improved. It is an object of the present invention to provide a trailer torch hitch height holding device which can be applied to all trailer towbars.

[0005]

In order to achieve the above object, the invention according to claim 1 is a tober rotatably pivotally attached to a bearing portion provided at a front end portion of a trailer body by a horizontal shaft. Is a toberhitch height holding device for holding at a predetermined height, wherein the toberhitch height holding device comprises a torque damper mechanism having a torque shaft fixed to the front end side of the trailer body, and a base side of the tober. A support body fixed to the torque shaft of the torque damper mechanism, and a damper arm fixed to the torque shaft of the torque damper mechanism abuts and supports the support body of the tober on the lower side of the horizontal shaft.

According to the first aspect of the present invention, since the toe bar is held by the torque damper mechanism against the trailer body, when the tow bar is connected to the hitch on the tow vehicle side when the trailer is used, the height of the toe bar hitch is increased. The height can be adjusted to the height of the hitch on the tow vehicle side without the support legs of the towbar *, and even when the towbar is leaned against the trailer body side when the trailer is not used, the reaction force of the damper action of the torque damper mechanism can be adjusted. With this, the tober can be pulled up lightly at the initial movement.

According to a second aspect of the present invention, in the invention according to the first aspect, the torque damper mechanism has a square cross section having a diagonal length slightly shorter than one side of the outer shell in a square cross section. A torque shaft having a rectangular shape is inserted, and rod-shaped rubber is press-fitted into each gap formed in a triangular prism shape formed by each even angle of the outer shell and each side of the torque shaft.

According to the second aspect of the present invention, the torque damper mechanism is configured by press-fitting a rod-shaped rubber into each triangular prism-shaped gap formed by each even angle of the outer shell and each side of the torque shaft. Since the damper characteristics of the torque damper mechanism due to the oscillating displacement of the torque shaft are such that the rod-shaped rubber is compressed while rolling, the damper function with excellent torsional rigidity can be achieved due to the durability of the rod-shaped rubber. .

According to a third aspect of the present invention, in the invention according to the first or second aspect, the damper arm fixed to the torque shaft of the torque damper mechanism is in contact with and supports the support body fixed to the tober. A tober height adjustment mechanism is installed in place.

According to the third aspect of the present invention, the damper arm is provided with the toe bar height adjusting mechanism at a position where the supporting body fixed to the toe bar abuts and supports, so that the hitch on the towing vehicle side is provided. Since the height of the tober hitch can be adjusted to the height of the vehicle, it can be connected to tow vehicles of different vehicle types.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailer torch hitch height holding device for holding at a predetermined height a tober pivotally attached to a bearing portion provided at a front end of a trailer body by a horizontal shaft, and more particularly to a tober hitch. The height holding device includes a torque damper mechanism having a torque shaft fixed to the front end side of the trailer body and a support body fixed to the base side of the towbar, and the towbar is fixed by the damper arm fixed to the torque shaft of the torque damper mechanism. The present invention relates to a trailer torch hitch height holding device capable of improving workability and safety in handling the towbar by supporting and supporting the above support on the lower side of the horizontal shaft.

In FIGS. 1 and 2, reference numeral 1 denotes a trailer body composed of a loading platform 3 which is driven by wheels 2. In FIGS. 3 and 4, a front end portion of the trailer body 1 is a bearing composed of left and right L-shaped brackets. The parts 4 and 4 are oppositely installed,
A bearing hole 6 and an insertion groove 7 communicating with the bearing hole 6 from above are provided in the upright piece 5 of each of the bearing portions 4 and 4. The insertion groove 7 is formed to have a diameter smaller than that of the bearing hole 6.

Reference numeral 8 denotes a tober connected to a hitch of a tow vehicle (not shown). The tober 8 has left and right legs 9 and 9 whose tip portions are jointed together, and the left and right legs 9 and 9 are connected.
A horizontal shaft 10 is integrally installed on the base of the. Further, the base portions of the left and right legs 9, 9 are formed such that the width between both outer ends thereof is substantially the same as the width between the standing pieces 5 of the bearing portions 4, 4 of the trailer body 1, and the left and right legs 9 are also formed. Both ends of a horizontal shaft 10 are projectingly provided at both outer ends of the bases of the trailers 9, 9, and the bearings of the trailer body 1 are provided at the projecting ends of the horizontal shaft 10 when the tober 8 is erected. An insertion portion having a width narrower than the diameter of the horizontal shaft 10 that can be inserted into the insertion groove 7 provided in the portion 4 is provided.

Further, the handle 1 is provided on the upper surface of the portion where the tip portions of the left and right legs 9, 9 of the towbar 8 are connected in a palmar manner.
1 is provided, and a tober hitch 12 is provided at the most distal end of the tober 8.
The narrow width insertion portions provided at both ends of the horizontal shaft 10 are inserted into the insertion groove 7 provided in the bearing portion 4 of the trailer body 1 in a standing state of the towbar 8 so that the trailer body 1 is connected to the trailer body 1. When not using, the tober 8 has a handle 11
The trailer is towed by the tow vehicle by pulling it up and leaning against the trailer body 1 side, and when using the trailer, pulling down the towbar 8 with the handle 11 and connecting the towbar hitch 12 to the hitch on the tow vehicle side.

Next, in FIGS. 3 and 4, reference numeral 13 is a tober hitch height holding device, and the tober hitch height holding device 13 has a torque damper having a torque shaft 14 fixed to the front end side of the trailer body 1. The towbar 8 is constituted by a mechanism 15 and a support body 16 which is fixed to the base side of the tober 8 across the inner surface of the leg 9 and the horizontal shaft 10, and is fixed to the torque shaft 14 of the torque damper mechanism 15 by a damper arm 17. The towbar 8 can be held at a predetermined height with respect to the trailer body 1 by abutting and supporting the support 16 of the above at the lower side of the horizontal shaft 10 that is integrally installed on the base of the towbar 8. .

The torque damper mechanism 15 will be described in more detail. Referring to FIGS. 5 and 6, the torque damper mechanism 15 will be described.
Is a square-shaped torque shaft 1 having a square cross-section having a diagonal length slightly shorter than one side of the outer shell 18.
4 is inserted, and the rod-shaped rubber 19 is press-fitted into each triangular prism-shaped gap formed by each even angle of the outer shell 18 and each side of the torque shaft 14.

The torque shaft 14 has one axial end extending outwardly from the outer shell 18.
The base portion of the bifurcated damper arm 17 integrally connected by the support receiving portion 20 that supports the support body 16 fixed to the base portion side of the towbar 8 is fixed to the extended portion of the towbar 8 support portion. 16 can be directly supported by the support receiving portion 20 of the damper arm 17, and the support receiving portion 20
A screw hole 21 is provided in the
A height adjusting mechanism 24 of the tober 8 is provided by rotatably screwing a support bolt 23 screwed to the support bolt 23 of the height adjusting mechanism 24.
The tober 8 may be adjusted to a predetermined height by supporting 6. The torque damper mechanism 15 is attached to a fixed bracket 26 fixed to the front end side of the trailer body 1 by a mounting bracket 25 fixed to the upper portion of the outer shell 18.

The trailer torch hitch height holding device 13 of the present invention is constructed as described above, that is,
The tober hitch height holding device 13 is composed of a torque damper mechanism 15 having a torque shaft 14 fixed to the front end side of the trailer body 1 and a support body 16 fixed to the base side of the tober 8, and the torque damper mechanism 15 includes Torque shaft 14
Since the support body 16 of the towbar 8 is abutted and supported on the lower side of the horizontal shaft 10 by the damper arm 17 fixed to the towbar 8, since the towbar 8 is held by the torque damper mechanism 15 as a damper with respect to the trailer body 1, When the towbar 8 is connected to the tow vehicle side hitch when the trailer is used, the torque damper mechanism 15 is used to finely adjust the height of the towbar hitch 12 to the tow vehicle side hitch height.
The operator can perform the operation with the load of the towbar 8 reduced by the damper action by the, and even when the towbar 8 is leaned against the trailer main body 1 side when the trailer is not used, the reaction force of the damper action of the torque damper mechanism 15 is exerted. This allows the tober 8 to be pulled up lightly at the initial movement.

Further, the torque damper mechanism 15 includes an outer shell 18
Since the rod-shaped rubber 19 is press-fitted into each triangular prism-shaped gap formed by each even angle and each side of the torque shaft 14, the torque shaft 14 of the torque damper mechanism 15 is formed.
The damper characteristic due to the oscillating displacement has a function of compressing the rod-shaped rubber 19 while rolling, and therefore, the durability of the rod-shaped rubber 19 can exert a damper function having excellent torsional rigidity.

Further, since the height adjusting mechanism 24 of the towbar 8 is installed in the damper arm 17 at a position where the support 16 fixed to the towbar 8 is contacted and supported, the height of the hitch on the towing vehicle side is increased. Since the height of the tober hitch 12 can be adjusted, it is possible to flexibly cope with the connection with tow vehicles of different vehicle types.

[0021]

According to the present invention configured as described above, since the towbar is held by the torque damper mechanism against the trailer body, the towbar is connected to the hitch of the towing vehicle when the trailer is used. Even if there is no support leg of the tober, the height of the tober hitch is on the towing vehicle side. It can be adjusted to the height of the hitch, and even when the trailer is leaning against the trailer body when the trailer is not in use, the reaction force of the damper action of the torque damper mechanism allows the tober to be pulled up lightly at the initial movement of the trailer body. By maintaining the torch's hitch height and reducing the load on the tober, workability and safety in handling the tober can be improved.

[Brief description of drawings]

FIG. 1 is a plan view in which a part of a toberhitch height holding device for a trailer according to the present invention is omitted.

FIG. 2 is a side view of a trailer torch hitch height holding device according to the present invention with a part thereof omitted.

FIG. 3 is a plan view showing a main part of a toberhitch height holding device for a trailer according to the present invention.

FIG. 4 is a cross-sectional side view taken along the line AA of FIG.

FIG. 5 is a front view of a torque damper mechanism.

FIG. 6 is a side view taken along the line BB of FIG.

FIG. 7 is a plan view of the related art.

FIG. 8 is a side view of the prior art.

[Explanation of symbols]

1 ... Trailer body 4 ... Bearing 8 ... Tober 10… Horizontal axis 13… Tober hitch height holding device 14 ... Torque shaft 15 ... Torque damper mechanism 16 ... Support 17 ... Damper arm 18 ... Outer shell 19 ... Rod rubber 21 ... Height adjustment mechanism

Claims (3)

[Claims] 1. A tober hitch height holding device for holding at a predetermined height a tober rotatably pivotally attached to a bearing portion provided at a front end portion of a trailer body by a horizontal shaft, the tober hitch. The height holding device includes a torque damper mechanism having a torque shaft fixed to the front end side of the trailer body and a support body fixed to the base side of the towbar, and is fixed to the torque shaft of the torque damper mechanism. A toberhitch height holding device for a trailer, wherein a supporter of the towbar is supported by a damper arm on the lower side of the horizontal shaft. 2. The torque damper mechanism is configured such that a torque shaft having a square cross section having a diagonal length slightly shorter than one side of the outer shell is inserted into the outer shell having a square cross section, and each even angle of the outer shell is increased. The toberhitch height holding device for a trailer according to claim 1, wherein a bar-shaped rubber is press-fitted into each of the triangular prism-shaped gaps formed by and each side of the torque shaft. 3. A tober height adjusting mechanism is installed in a portion of the damper arm fixed to the torque shaft of the torque damper mechanism, which abuts and supports a support body fixed to the tober. A toberhitch height holding device for a trailer according to claim 1 or 2.