JPH0442967Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention This invention relates to a work implement coupling device for connecting a work implement to the rear of a tractor.

Technical background of the invention and its problems Conventionally, in a two-point connection between a tractor and a working machine, the tractor body and the working machine are connected via a pivot having a lateral axis, and the Generally, a lift arm that is provided and moved up and down by a hydraulic system is connected to a working machine to move the working machine up and down about the axis of a pivot. However, depending on the field, the ridges may not be in a straight line, and if you operate the handle of the machine while working with the work equipment in such fields and try to move the machine along the ridge, the rear of the machine may The connected work equipment moves in an arc centered around the rear wheels of the machine, and receives great resistance from the ground, which, if severe, can lead to damage to the pivot parts, etc. In addition, when a rotary work machine and a ridge shaper are sequentially connected to the rear of the machine, the length from the rear wheels of the machine to the ridge shaper becomes larger, which makes it difficult to change the direction of movement of the machine by operating the handle. The amount of arc-shaped movement of the ridge shaper centered on the rear wheel position becomes large, and the sides of the ridge are collapsed and the width of the ridge becomes extremely narrow, making it difficult to properly shape the ridge.

Purpose of the invention This invention was developed in consideration of the above points, and it is designed to prevent large resistance from being applied to the work equipment even when the direction of movement of the tractor body is corrected when the work equipment is connected to the tractor. It is an object of the present invention to provide a work machine coupling device that prevents the above problems and allows work with a work machine to be carried out safely and satisfactorily.

Summary of the invention In this invention, an intermediate bracket is connected to a bracket provided at the rear end of the tractor body so as to be movable up and down, and a work machine is connected to the axis of the tractor via a connecting body having a vertical axis. By connecting, via a lift rod, a lift frame that is rotatably rotatable in the left and right directions about the center of the machine and is fixedly provided on the intermediate bracket, and a lift arm that is provided on the aircraft body and is moved up and down by a hydraulic device. When the work equipment is rotated vertically together with the intermediate bracket, and then rotated independently around the axis of the coupling body in the left and right directions to correct the machine's traveling direction, the work equipment This prevents excessive resistance from being applied and allows the work to be carried out smoothly. Also, when the work equipment is rotated to a predetermined position above, a regulating device is used to prevent the work equipment from rotating in the left and right direction. Even if it is provided in the upper position, its rotational movement in the left and right direction is restricted in the raised position to ensure safety.

Embodiment of the invention An embodiment of the invention will be described based on the drawings. A fixing bracket 2 is tightened and fixed to the rear end of the tractor body 1 by a plurality of bolts 3, and a bearing 5 is attached to the fixing bracket 2, which is secured by a retaining clip 4. A swinging bracket 6 is attached to the fixed bracket 2 via the bearing 5 so as to be rotatable along the circumferential direction of the bearing 5. A PTO shaft 7 located at the center of the bearing 5 is provided at the rear end of the body 1 so as to protrude rearward.

At the rear of the swing bracket 6, there is a pair of left and right pivot shafts 8 having left and right axes, and an intermediate bracket 9 is connected to these pivot shafts 8.
are connected to be rotatable in the vertical direction around the axis. A pair of left and right lift frames 10 are fixed to the intermediate bracket 9, and a pair of left and right lift arms extend rearward from the machine body 1 and are connected to a hydraulic system (not shown) to rotate in the vertical direction. 11 and the lift arm 1
A hydraulic cylinder 13 is provided on one of the pair of left and right lift rods 12.

The intermediate bracket 9 is provided with a pair of upper and lower pivot shafts 4 which are connecting bodies having vertical axes.
The work equipment mounting frame 16 fixed to the work equipment 15 is coupled to the pivot shaft 14 so as to be rotatable in the left and right directions about the axis of the pivot shaft 14. A pair of left and right restricting tools 19 comprising a restricting link 17 and an adjusting screw 18 are provided between the work equipment mounting frame 16 and the swing bracket 6. In addition,
The input shaft 20 of the working machine 15 and the PTO shaft 7 are connected by a universal joint 21.

In such a configuration, by expanding and contracting the hydraulic cylinder 13, the working machine 15 is moved along with the intermediate bracket 9 and the swing bracket 6, as well as the bearing 5.
Therefore, even if the machine body 1 is tilted due to unevenness in the field, the hydraulic cylinder 1
3 to maintain the work machine 15 in a horizontal state,
Work can be done evenly.

Next, when the traveling direction of the machine body 1 is corrected during work, the work implement 15 will be in a state of rotating in the left and right directions around the axis of the pivot shaft 14 in response to the bending of the machine body 1. Therefore, work equipment 1
No large horizontal resistance acts on 5,
Damage to the working machine 15 and the connecting portion between the working machine 15 and the machine body 1 can be prevented. In addition, since the work equipment 15 follows the curve in the traveling direction of the machine body 1 while gently changing its direction according to the traction force from the machine body 1,
The finished state of work is improved. Particularly in the ridge-making work, uniform ridges are formed at the locations where the traveling direction of the body 1 has been corrected, similar to those at the straight-travel direction locations.

Further, the working machine 15 is rotated in the vertical direction around the axis of the pivot shaft 8 together with the intermediate bracket 9 by vertically rotating the lift arm 11. The working machine 15 is raised to avoid interference with the ground. When the working machine 15 is raised to a predetermined position above, the left and right regulating members 19 are stretched in a straight line as shown in FIG. For this reason, the pivot shaft 8 of the work machine 15
The rotational movement around the axis is restricted, and swinging of the work implement 15 in the left-right direction when the work implement 15 is moved in an elevated state is prevented.

Effects of the invention Since this invention is configured as described above, if the traveling direction of the machine is corrected during work, the work machine will be rotated in the left and right direction with respect to the machine, so the work machine and the This prevents large lateral resistance from acting on the connection between the machine and the machine body, and also allows the work machine to gently change direction and follow the bends in the machine's direction of travel, resulting in a better finish. The condition can be improved, and when the work equipment is rotated upward to a predetermined position, the horizontal movement of the work equipment can be restricted by the regulating device, and the work equipment can be raised while being connected. This has the effect of making it possible to safely and easily move the vehicle while the vehicle is in the upright position.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view, Figure 2 is a partially enlarged cross-sectional side view, Figure 3 is a side view showing the working machine rotated to a predetermined upper position, and Figure 4 is a side view of the tractor. FIG. 5 is a plan view when the tractor is traveling straight, and FIG. 5 is a plan view when the direction of travel of the tractor is corrected. 1... Airframe, 6... Swing bracket (bracket), 9... Intermediate bracket, 10... Lift frame, 11... Lift arm, 12... Lift rod, 14... Pivot shaft (connection body),
15... Working equipment, 19... Regulating tool.

Claims (1)

[Scope of utility model registration request] An intermediate bracket is connected to a bracket provided at the rear end of the tractor body so as to be movable up and down, a lift frame is fixedly attached to the intermediate bracket, and a lift arm is provided on the body and is moved up and down by a hydraulic device. A work machine is connected to the intermediate bracket via a lift rod, and a working machine is connected to the intermediate bracket so as to be rotatable in the left and right directions about the axis thereof through a connecting body having an axis in the vertical direction. 1. A work equipment coupling device characterized in that a restriction device is provided for restricting the horizontal rotational movement of the work equipment when the work equipment is rotated to a predetermined position above.