JP2001146181A - Two-point hitch coupler for installation on tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hook up a work implement having an existent three-point link hitch easily, via a two-point hitch system for direct installation of a rotary work implement on a tractor. SOLUTION: A mast frame has a top hook, a right lower hook and a left lower hook adapted to engage a three-point hitch on a work implement. A hitch frame, which is located on the front of the mast frame, has at the points a pair of engaging members for engagement with receiving members of a two- point hitch system on a tractor. The hitch has coupling pins connectable to lifting and lowering arms on the tractor, so that the engagement receiving members of the two-point hitch system offer a pivot for pivotal lifting and lowering movement. The two-point hitch device on the tractor can be used to hook up the work implement with the existent three-point link connection easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a small tractor 2
The present invention relates to an improvement in a coupling device for attaching a working machine to a point hitch.

[0002]

2. Description of the Related Art For directly mounting a small tractor on a rotary,
The two-point hitch method is often used. It is known that the working machine mounted on the rear of the tractor is designed to be lightweight, and has a configuration that suppresses the forward climbing phenomenon of the tractor and stabilizes the running balance by being mounted as close to the rear of the tractor as possible. ing. Particularly, the rotary working machine of the small tractor is an engagement receiving member fixed to the rear of the tractor.
With the point hitch part as a fulcrum, it is directly detached and connected by an elevating arm. The rotary working unit is moved down and up and down by the elevating arm during work and movement.

[0003]

Many tractor implements are configured for standard, three point link hitch mounting on small, medium and tractor mounts. This conventional three-point link hitch-compatible work machine is used as a small tractor.
In order to install the point hitch system, it is necessary to remodel each one for a dedicated two-point hitch. Therefore, an attempt is made to propose a coupling device that can use the three-point link hitch-corresponding portion on the working machine as it is by utilizing the two-point hitch method of a small tractor.

[0004]

In order to solve the above-mentioned problems, a mast frame having a top hook and a left and right lower hook corresponding to a three-point connecting portion on the working machine side, and a mast frame connected to a front portion of the mast frame. A frame is provided, a pair of engagement members corresponding to the two-point hitch engagement receiving member on the tractor side are provided at the end of the connection frame, and a connection pin connectable to the lifting arm on the tractor side is provided on the connection frame. Thus, a two-point hitch connecting device to be mounted on a tractor configured to be rotatable up and down with the two-point hitch engagement receiving member as a fulcrum is proposed.

[0005]

With the two-point hitch coupling device mounted on the tractor having the above-described structure, the two-point hitch portion, which was conventionally dedicated to a directly mounted rotary, can be operated only by an operator sitting on the tractor controlling the lifting arm by a hydraulic lever. Thus, the connection can be easily performed by fitting and engaging with the three-point link mounting engagement portion on the working machine side.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration will be described with reference to the drawings embodying the present invention.

FIG. 1 is a side view of the embodiment of the present invention, in which a working machine is connected to a tractor. FIG. 2 is a side view of the embodiment of the present invention, and is an explanatory diagram immediately before connecting a working machine to a tractor. FIG. 3 is a perspective view showing a connecting device embodying the present invention. FIG. 4 shows a conventional working machine, which is an embodiment having a three-point link engaging portion.

In FIG. 1, reference numeral 5 denotes a rear part of the tractor,
Reference numeral 1 denotes a pair of left and right elevating arms, which move up and down by a known and well-known hydraulic control. Reference numeral 3 denotes a pair of U-shaped fittings, which is an embodiment corresponding to a well-known rotary directly mounted two-point hitch engaging member, which is opened rearward and is fixed to project. Reference numeral 4 denotes a power take-off shaft for transmitting the torque on the tractor side. Reference numeral 15 denotes a connecting device, and the mast frame 9
The horizontal axis 6 located at the front end of the connection frame 10 provided in front of
An engagement member that is inserted into the U-shaped bracket 3 and locked. The lower end of the lift rod 2 connected to the lifting arm 1 is connected to the top of the middle part of the connection frame 10. The three-point connecting part of the mast frame 9 is engaged with and connected to the three-point connecting part of the work machine 11.

The connecting device 15 shown in FIG. 3 will be described. The top of the mast frame 9 has a concave top hook 7 and a U-shaped lower hook 8 opened rearward at both ends. At the front of the mast frame 9, a parallel connection frame 10 is arranged forward. A horizontal shaft 6 is provided at each of the left and right ends of the connecting portion 10, and a connecting pin 16 is provided at the top of the intermediate portion. Reference numeral 2 indicated by a virtual line indicates a lift rod connected to the lifting arm 1 on the tractor side, which is fixed to the connection pin 16 described above.

FIG. 4 shows a conventionally known working machine.
It has a mounting portion to be engaged with the three-point link connecting portion at the front. In this embodiment, a fertilizer spreader is shown, and 12
Is a top link pin, and lower link pins 13 are provided at lower ends on both sides of the fertilizer spreader 11.

In FIG. 2, a connecting device 15 is connected to a two-point hitch portion of the rear portion 5 of the tractor, and the connecting device 15 is moved up and down by the elevating arm 1 so that the top hook 7 is engaged with the top link pin 12 of the working machine 11. When raised, the work machine 11 is in a suspended state, and the lower link pins 13 are engaged with the left and right lower hooks 8 by its own weight, and if necessary, a retaining pin or the like is inserted to complete the mounting. Work machine 1
When the lifting link 1 is to be removed, the lifting link 1 may be lowered to contact the ground, and then the lower hook 8 may be pulled forward, and then the top link may be lowered further to be pulled out.

[0012]

According to the present invention, when a conventional standard three-point link type working machine is seated on a tractor by using a two-point hitch for rotary mounting of a small tractor, it can be easily mounted. It has become.

[Brief description of the drawings]

FIG. 1 is a side view embodying the present invention, in which a working machine is connected to a tractor.

FIG. 2 is a side view of the embodiment of the present invention, which is an explanatory view immediately before connecting a working machine.

FIG. 3 is a perspective view of a connecting device embodying the present invention.

FIG. 4 shows a conventional working machine, which is an embodiment having a three-point link engaging portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lifting arm 2 lift rod 3 U-shaped bracket 4 moving shaft 5 tractor rear 6 horizontal axis 7 top hook 8 lower hook 9 mast frame 10 connection frame 11 work machine 12 top link pin 13 lower link pin 14 rotation transmission shaft 15 connection device 16 Connecting pin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B041 AA09 AA17 AB05 AC05 AC08 CA03 CA15 CF14 2B052 BC05 BC06

Claims (1)

[Claims] 1. A mast frame having a top hook and a left and right lower hook corresponding to a three-point connecting portion on a working machine side, a connecting frame provided at a front portion of the mast frame, and a leading end of the connecting frame provided on a tractor side. A pair of engagement members corresponding to the two-point hitch engagement receiving member are provided, and a connection pin that can be connected to the lifting arm on the tractor side is provided on the connection frame, and the two-point hitch engagement reception member is supported by a fulcrum. A two-point hitch coupling device mounted on a tractor that is configured to be rotatable up and down.