JPH0121044Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a towing device such as a lime sawer for a tractor that is attached to the body of the tractor so as to connect and tow a towed working machine such as a lime sawer. It is something.

At the rear of the tractor body, there is usually a three-point hitch consisting of a top link and a lower link for mounting a directly mounted working machine such as a rotary tiller so that it can be raised and lowered, and a towed type such as a lime sawer. A towing hitch is installed to connect and tow the work equipment. The tow hitch part can be of course a fixed type fixed to the rear of the body a of tractor A, or a three-point hitch consisting of a top link and a lower link as described in Japanese Utility Model Publication No. 46-23041. Utilizing the lifting and lowering operation by the soft arm,
Even though the automatic hitch is designed to automatically connect the work equipment, its protrusion length from the rear of the tractor body is short, so the three-point link consisting of a top link and a lower link is required. For example, if a rotary tiller is mounted directly on a hitch as a directly mounted working machine, a towed working machine such as a lime sawer cannot be towed unless the directly mounted working machine is removed. It is now impossible to connect them.

However, directly mounted work equipment such as a rotary tiller, which is mounted directly to the rear of the tractor using a three-point hitch, is so heavy that it cannot be lifted by a single worker. However, the task of attaching and detaching it is extremely troublesome. From this, we installed a rotary tiller directly on the rear of the tractor to cultivate the field.
Then, when working on the field, a directly mounted work machine and a towed work machine are installed alternately to perform work, such as when a lime sawer is connected to the rear of a tractor and towed to spread lime. Furthermore, it takes a lot of time and effort to attach and detach this directly mounted type of working machine, resulting in a problem of poor work efficiency.

The present invention was devised to solve this problem, and allows the rotary tiller to be mounted on the rear of the tractor body via a three-point hitch so that it can be raised and lowered, without requiring any complicated mechanism. It is an object of the present invention to provide a means for connecting a towed type working machine to a towing hitch fixedly mounted on the rear body of a tractor.

In the present invention, as a means to achieve this purpose, at the rear of the tractor body,
The rotary tilling device is connected and mounted so as to be able to rise and fall freely via a three-point hitch installed on the rear side of the machine, and is set to the raised position by the operation of the lift arm. A connecting part is provided for connecting to a towing hitch part fixedly mounted on the rear surface of the tractor body, and a towing hitch for connecting the work equipment is provided at the rear end, and the length approximately corresponds to the longitudinal length of the machine frame of the rotary tilling device. A traction member with a longitudinal length is formed and arranged so that its longitudinal length can be freely adjusted, and the traction member is suspended from the body of the rotary tilling device by an appropriate suspension mechanism, and the traction member is The present invention proposes a towing device such as a lime sawer for a tractor, in which a connecting portion at the front end is connected to a towing hitch portion fixedly mounted on the rear surface of the body of the tractor.

Next, an example of implementation will be described in detail with reference to the drawings.

Fig. 1 is a partially omitted side view of a tractor that can carry out the present invention in a state in which a lime sawer is towed and connected; in the figure, A is the tractor, a is its body, and 1 is a three-point hitch at the rear of the machine a. 5 is a towing hitch installed at the rear of the machine body a, 3 is a traction member, and 4 is a lime sawer.

Tractor A is a conventionally known four-wheeled tractor, the front half of which is omitted in the drawing, and one of the left and right rear wheels has been removed. A PTO shaft 2 and a fixed tow hitch section 5 are installed on the rear side of the fuselage a, and a three-point hitch consisting of a top link 21 and a lower link 22, and a hydraulic system 24 are installed. A lift arm 23 that moves up and down is installed.

The rotary tillage device 1 includes a transmission case 10 that houses a transmission mechanism (not shown) that transmits power through a P/T/O shaft 2 and a universal joint shaft 20, which are installed on the body a of the tractor A. A rotary shaft 11 is mounted on the machine frame and protrudes from the lower end of the transmission case 10 to the left and right (the opposite side is omitted).
This is a conventionally known type in which a large number of tilling claws 12 for cultivating the field are attached, and a tail wheel 13 serving as a ruler wheel is provided. The rotary tilling device 1 is mounted so that it can be raised and lowered by a three-point hitch consisting of a top link 21 and a lower link 22 provided at the rear of the body a of the tractor A, and a lift arm 23 connected to the lower link 22 is operated. When moving up and down with respect to body a of tractor A,
It is designed so that it can be pulled upwards. Further, the transmission of the rotational power to the rotary shaft 11 of the rotary tillage device 1 is connected/disconnected by a clutch (not shown) of the P/T/O shaft 2 provided on the body a side of the tractor A. The clutch is controlled to be "off" and cut off from transmitting power to the rotary shaft 11 when the rotary tilling device 1 is raised.

As shown in FIG. 3, the towing member 3 slides between an inner cylinder 3a having a connecting part 30 at the front end that connects to the towing hitch part 5 of the tractor A, and an outer cylinder 3b having a towing hitch 31 at the rear end. They are formed into a double shaft shape that can be freely fitted together, and are integrally connected by a connecting pin 32 that passes through them vertically. The connecting pin 3
2 is provided on the inner cylinder 3a side of the traction member 3 so that it can be inserted into and removed from a large number of adjustment holes 33 provided vertically through the pulling member 3, and the inner cylinder 3
a into and out of the outer cylinder 3b to obtain the desired length, adjust the adjustment hole 33 selected from the adjustment holes 33...
The length of the traction member 3 can be adjusted by inserting the connecting pin 32 according to the length of the traction member 3.
The front and rear lengths of the rotary tiller 1 correspond to the front and rear lengths of the rotary tiller 1, as shown in FIGS. 1 and 2. The connecting portion 30 at the front end of the traction member 3 is formed in a shape with a connecting hole 30b penetrating through a tongue-like protruding plate surface 30a, and the towing hitch 31 at the rear end is
A hitch plate 31a with a U-shaped cross section and open toward the rear.
A hitch hole 31b penetrating vertically is provided, and the hitch hole 31b is formed in the same shape as the towing hitch portion 5 provided on the rear surface of the body a of the tractor A. Then, the traction member 3
is the body a of tractor A, as shown in Figure 2 above.
When the rotary tilling device 1, which is mounted on the rear side so as to be able to be raised and lowered by a three-point hitch, is pulled up to the raised position by the operation of the lift arm 23, a rotary tilling device 1 is placed below the rotary tilling device 1, with its longitudinal direction being the front-rear direction. The intermediate part in the longitudinal direction thereof is suspended by the suspension mechanism 6 on the machine frame of the rotary tiller 1 in the raised position, and the connecting part 30 at the front end is connected to the machine body a of the tractor A. It is connected to the tow hitch part 5 on the rear surface.

The suspension mechanism 6 may be designed as desired as long as it can be hooked onto the machine frame of the rotary tiller 1. In this embodiment, as shown in FIG.
b, insert the mounting pin 35 into the free end side of the hanging chain 60, and insert and remove the mounting pin 35 into the mounting bracket 34 provided on the outer cylinder 3b as shown in Fig. 4. By doing so, the traction member 3 is suspended. At this time, by changing the insertion point of the mounting pin 35 into the link plate on the free end side of the hanging chain 60, the hanging chain 60
The length can be adjusted.

The lime sawer 4 has a traction rod 4 that protrudes from the front side.
This is a conventionally known type that is made to be towed by the tractor A by connecting a hitch part provided at the front end of the tractor A to a towing hitch part 5 installed on the rear surface of the body a of the tractor A. Shutter opening/closing lever 4 that opens and closes its outlet (not shown)
0 is set. The lime sawer 4 connects the hitch portion at the front end of its traction rod 42 to the traction hitch 31 provided at the rear end of the traction member 3, and thereby connects the traction hitch portion 5 of the tractor A via the traction member 3.
It has a traction connection. A remote control rope 41 is connected to the shutter opening/closing lever 40 of the lime sawer 4, and its operating portion 41a
is guided to the rear of fuselage a of tractor A so that an operator sitting in the seat of fuselage a can remotely control it.

The embodiment device constructed in this manner operates as follows.

When the rotary tilling device 1 is mounted on the rear of the body a of the tractor A so that it can be raised and lowered by a three-point hitch, let's connect the lime sawer 4 to the tow hitch part 5 of the body a of the tractor A to tow it. In this case, first, the rotary tiller 1 is raised to its full extent by the lift arm 23, and then locked in the raised position. Next, the traction member 3 is placed below the raised rotary tilling device 1, and the connecting portion 30 at the front end thereof is connected to the traction hit portion 5 of the tractor A. Then, lift the towing member 3 so that the towing hitch 31 side on the rear end side thereof is approximately horizontal when viewed from the side, and then attach the hanging chain 60 of the suspension mechanism 6 to the rotary tiller 1.
After attaching the free end of the suspension chain 60 to the mounting bracket 34 and suspending it, attach the traction rod of the lime sawer 4 to the traction hit 31 at the rear end of the traction member 3. 42 to connect the hitch at the front end.

As a result, the lime sawer 4 can be moved to the traction hit part fixedly mounted on the rear surface of the body a of the tractor A without being obstructed by the rotary tiller 1 mounted on the rear surface of the body a of the tractor A with a three-point hitch. 5 will be towed and connected.

At this time, the traction member 3, which is attached to the traction hit part 5 of the tractor A, is stabilized by being suspended by the suspension mechanism 6 using the raised machine frame of the rotary tiller 1 as a support member. The lime sawer 4, which is supported by the towing hitch 31 at the rear end of the lime sawer 4, is pulled in a stable state.

As explained above, the traction device such as the lime sawer for the tractor according to the present invention is suitable for the tractor A
A rotary tilling device 1 is attached to the rear of the machine a, connected to the machine so that it can be raised and lowered via a three-point hitch installed on the rear side of the machine a, and set to the raised position by the operation of the lift arm 23, and the rotary tiller 1 Below the tilling device 1, there is a machine body a of the tractor A at the front end.
It is equipped with a connecting part 30 that connects to a traction hitch part 5 fixedly installed on the rear surface, and a traction hitch 31 for connecting a working machine at the rear end, which approximately corresponds to the longitudinal length of the machine frame of the rotary tilling device 1. A traction member 3 having a longitudinal length of , a connecting portion 3 at the front end of the traction member 3
Since the rotary tiller 1 is connected to the towing hitch part 5 fixedly mounted on the rear surface of the body a of the tractor A, the rotary tilling device 1 is connected to the rear of the body of the tractor A via a three-point hitch. Then, a towed work machine such as Lime Sower 4 is connected and attached to tractor A, and the farm is tilled.
When performing work such as scattering lime on a field that has been tilled, the three-point hitch is raised by the operation of the lift arm 23, and the connected rotary tillage device 1 is pulled up, and the By using the traction member 3 disposed in the space, a towed type working machine such as a lime sawer 4 can be connected and attached without removing the rotary tilling device 1 from the rear body of the tractor A, and ,
The towing member 3 to which the towed type work machine is connected and attached is suspended from the rotary tilling device 1, which has been lifted up to an upper position by the lift arm 23 so as not to get in the way, as a support member. In addition, since the towing member 3 can be adjusted in the longitudinal direction, it becomes possible to stably tow a desired towed type working machine.

[Brief explanation of the drawing]

Figure 1 is a side view of the entire tractor with a lime sawer connected to the invention, and Figure 2 is a side view of the same as above with the lime sawer removed.
FIG. 3 is a perspective view of the traction member, and FIG. 4 is a partially cutaway side view of a portion of the hanging chain with the free end side attached. Explanation of drawing symbols, A...tractor, a...body, 1...rotary tilling device, 10...conduction case, 11...rotary shaft, 12... tilling claw,
13...tail wheel, 2...P/T/O axis, 20...universal joint, 21...top link,
22...Lower link, 23...Lift arm,
24... Hydraulic device, 3... Traction member, 3a... Inner cylinder, 3b... Outer cylinder, 30... Connection portion, 30a...
Plate surface, 30b...Connection hole, 31...Tow hit,
31a...Hitchi plate, 31b...Hitchi hole, 32
...Connecting pin, 33...Adjustment hole, 34...Mounting bracket, 35...Mounting pin, 4...Lime sower, 4
0... Shutter opening/closing lever, 41... Operating rope, 41a... Operating section, 42... Lime sawer traction rod, 5... Towing hitch portion, 6... Suspension mechanism,
60...Hanging chain.

Claims (1)

[Scope of utility model registration request] A rotary tilling device 1 is attached to the rear of a machine body a of a tractor A and is connected to the rotary tiller 1 so that it can be raised and lowered via a three-point hitch installed on the rear side of the machine body a, and is set to a raised position by operating a lift arm 23. Below the rotary tilling device 1, a tow hit portion 5 is fixedly mounted on the front end of the rear surface of the body a of the tractor A.
The traction member 3 is provided with a connecting portion 30 to be connected to the traction member 3 and a traction hitch 31 for connecting the work equipment at the rear end, and has a longitudinal length approximately corresponding to the longitudinal length of the machine frame of the rotary tilling device 1, The longitudinal length of the traction member 3 is freely adjusted and arranged, and the traction member 3 is suspended from the body of the rotary tilling device 1 by an appropriate suspension mechanism 6, and the connecting portion at the front end of the traction member 3 is 30 is connected to a tow hitch portion 5 fixedly mounted on the rear surface of the body a of the tractor A, such as a lime sawer or the like for a tractor.