JPS5915846Y2 - Work equipment lowering prevention device for tractors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work machine fall prevention device for a tractor in which the work machine is supported by a three-point link.

BACKGROUND ART Conventionally, when a work machine is held in an elevated position, such as when traveling on a road, the hydraulic circuit for lifting and lowering the work machine is locked using a valve to prevent the work machine from descending.

However, with this method, oil leakage occurs on the valve seat surface, and vibrations of the work equipment while running on the road may cause natural descent, which has caused serious accidents.

Therefore, in the present invention, a hook is loosely fitted into the top link of a three-point link so that it can only rotate freely, and when the work equipment is in a raised position, the top link is attached to the bracket on the machine side that pivots. It is an object of the present invention to provide a work equipment lowering prevention device for a tractor which eliminates the above-mentioned drawbacks by configuring the hook to be hooked.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a working implement 5 is attached to the rear of the tractor 1 via a three-point link 4 comprising left and right lower links 2 and a top link 3.

Power is transmitted to the work machine 5 from a PTO shaft 6 via a transmission shaft 7, and the lower link 2 is connected to a lift arm 9 which is freely rotatable by a hydraulic device via a lift rod 8.
The working machine 5 can be raised and lowered freely.

The vehicle body side of the top link 3 is attached to a mounting bracket 11 that is fixed to the rear of the tractor 1 with a bolt 10, and a pin 1 is attached to the mounting bracket 11.
It is supported by 2.

As shown in detail in FIG. 3, the mounting bracket 11 includes a flat plate 13 having a hole 13a for the fixing bolt 10;
It consists of a U-shaped plate 15 with a U-shaped cross section, which is welded to the
A plurality of "JL15C" for supporting the pin 12 are bored in the rising part 15a of the U-shaped plate 15, and these holes 1
The pin 16 is always fitted into the holes 15C' and 15C' at the top of the hole 5C.

Furthermore, as shown in FIG. 4, the top link 3 has holes 17 and 17 for the connecting pins 12 at both ends, and a turnbuckle 18 and a lock nut 20 for length adjustment in the middle part. It has become.

A metal fitting 22 for hook attachment is provided on the turnbuckle 18 by means of a flange portion 18 a and a C-shaped retaining ring 21 so as to be rotatable only.

For hook attachment, a pin 25 is inserted into the winding portion 23a of the metal fitting 22, as shown in FIG.
A hook 23 is provided to prevent removal.

The other end of the hook 23 is hooked at part 23b, and the hook 23 is in the raised position of the working machine 5, and the hook is at part 23b.
b is arranged so that it can be hooked onto the pin 16 of the bracket 11.

Since the present invention has the above configuration, as shown in FIG. 1, when the tractor 1 is working in the field, the working machine 5 can be freely raised and lowered by rotating the lift arm 9.

At this time, when installing the hook, the metal fitting 22 is attached to the turnbuckle 1.
8, and the hook 23 hangs down due to its weight.

Next, as shown in FIG. 2, when driving the tractor 1 on the road or inspecting and servicing the work equipment, the work equipment 5 is raised and the hook 23 is attached to the hook portion 23b of the bracket 1.
Hook it on pin 16 of 1.

As a result, the work implement 5 will not descend even if the work implement falls by itself or the operating lever is accidentally touched.

As explained above, according to the present invention, the top link 3
By hooking the hook 23 provided on the bracket 11 onto the pin 16 of the bracket 11, the work machine 5 is prevented from falling, thereby completely preventing the work machine from falling by itself due to vibration or the like and from falling due to erroneous operation. This makes it possible to prevent accidents during road driving, inspection and maintenance, etc.

Additionally, when the work equipment 5 is removed, conventionally the top link 3
If the top link 3 was not removed by removing the pin 12 on the vehicle body side, the top link 3 would hang down and cause trouble in driving.However, according to the present invention, the top link 3 is held by hooking the hook 23 on the pin 16. Therefore, even if only the pin on the working machine side is removed and the top link is held, the top link 3 will not interfere with running.

Furthermore, the conventional mounting can use the bracket 11, and it is only necessary to add the hook 23 to the top link 3, so it can be manufactured at low cost and can be easily mounted on conventional products.

In addition, when attaching the hook, the metal fitting 22 is loosely fitted onto the top link 3 so that it can only be rotated freely, so when it is not hooked, the hook 23 is always facing downward.
The hook 23 will not be inadvertently caught on the pin 16 and will not interfere with the lifting and lowering operation of the working machine.

[Brief explanation of the drawing]

Figure 1 shows the three-point linkage of a tractor to which the present invention is applied, showing the state in which the implement is being lowered while working in a field, and Figure 2 shows the tractor being raised to prevent it from descending. Figure 3 is a perspective view showing the mounting bracket;
FIG. 4 is a front view showing the top link, and FIG. 5 is an exploded perspective view showing the metal fittings for hook attachment. 1...Tractor, 3...Top link, 4...3-point link, 5...Work equipment, 11...Bracket for installation , 23...
·hook.

Claims (1)

[Scope of utility model registration request] In a tractor in which a working machine is supported by a three-point link, a hook is loosely fitted to the top link of the three-point link so that only rotation is possible, and the top link is pivotally supported when the working machine is in a raised position. The device for preventing the work machine from falling is configured such that the hook is hooked onto a bracket when installed on the machine body side.