JPS5811602Y2 - Drawbar support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drawbar support device for a full trailer that allows the height of the drawbar to be adjusted.

The present invention provides a device that allows a driver to adjust the height of a drawbar by himself in order to connect a full trailer and a tractor, and also maintains the adjusted position in a state that absorbs vertical movement while traveling. The gist of this system is that the bell crank 4 is rotatably pivoted in the middle of the bell crank 4 to a drawbar which is pivotally mounted to the lower end of the dolly frame 7 so as to be able to move up and down. One end of the crank 4 is pivoted to the lower end of an adjustment screw 6 that moves up and down by 110 rotations of a drive male screw, and the upper end of a tension spring 9 whose lower end is connected to the lower end of the bell crank 4 is placed at a higher position than the lower end of the bell crank 4. This is a drawbar support device connected to a spring hanger 8 of a certain dolly frame 7.

An embodiment of the present invention will be described below based on the drawings.

A downward bracket 3 is fixed to the cross member 2 of the drawbar 1, a bell crank 4 is connected with a pin to this bracket 3 so as to be rotatable back and forth, and the lower end of the adjustment screw 6 of the rotation mechanism 5 is attached to the front end of the bell crank 4. Further, the other end of a tension spring 9, which has one end connected to a spring hanger 8 fixed to the dolly frame 7, is connected to the rear end of the bell crank 4.

The rotation mechanism 5 is composed of a drive female screw 11 having a handle 10 fixed to its upper end, the adjustment screw 6 screwed thereto, and a bearing 12 that rotatably supports the drive female screw 11. The bearing 12 is supported by a horizontal bracket 13 fixed to the cross member 2 of the drawbar 1.

The drawbar 1 is coupled to the dolly frame 7 by a pin 15 so as to be vertically movable.

Further, numeral 14 in the figure is a trailer frame.

In this embodiment, since the configuration is as described above, the drawbar 1
The height of the trailer can be easily adjusted and the height can be maintained, allowing the driver to connect the full trailer and tractor by himself. Furthermore, after coupling, the relative vertical movement of the full trailer and tractor due to vibrations while driving is avoided. Since it is absorbed by the tension spring 9, destruction of the device can be avoided.

To explain this in detail, if it is necessary to adjust the tip height of the drawbar 1 when connecting a full trailer to a tractor, rotate the handle 10 of the rotation mechanism 5 in a predetermined direction and tighten the drive female screw 11. By rotating the adjustment screw 6, the adjustment screw 6 is raised and lowered, thereby rotating the bell crank 4 in the front-rear direction, raising and lowering the drawbar 1, and the height of its tip can be easily adjusted by aligning the draw bar with the tractor.

Since the rear end of the old bell crank 4 and the spring hanger 8 fixed to the dolly frame 7 are connected by a tension spring 9, in other words, the drawbar 1 is kept balanced by the tension spring 9, so it is difficult to avoid irregularities on the road surface while driving. Even if a relative vertical movement occurs in the full-trailer tractor and the drawbar 1 moves up and down, this degree of displacement can be absorbed by the tension spring 9 and damage to the device can be avoided.

Therefore, as understood from the description of the above embodiments,
According to the present invention, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic side view of the entire structure, and FIG. 2 is an enlarged view of section A in FIG. 1. 1 is a drawbar, 2 is a cross member, 3 is a downward bracket, 4 is a bell crank, 5 is a rotation mechanism, 6 is an adjustment screw, 7 is a dry arm, 8 is a spring hanger, 9 is a tension spring, 10 is a handle, 11 is the drive capacity screw,
12 is a bearing.

Claims (1)

[Scope of utility model registration request] A bell crank is rotatably pivoted in the middle of the bell crank to a drawer bar which is pivotally attached to the bottom end of the dolly frame so that it can move up and down, and one end of the bell crank is attached to an adjustment screw that moves up and down by the rotation of a female drive screw. 1. A drawbar support device, characterized in that the upper end of a tension spring mounted on the lower i-axis and having its lower end connected to the lower end of the bell crank is connected to a spring ring of a dolly frame located at a higher position than the lower end of the bell crank.