JPS5913762Y2 - Safety devices in reapers - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns a safety device for reapers.

Conventionally, safety devices for reapers mounted on tractors are known.

A well-known safety device is a safety device that prevents the cutting blade from colliding with an unforeseen obstacle that cannot be avoided during harvesting in the field, or when a large amount of dense grass is entangled with the cutting blade and cannot be harvested. In order to prevent damage to the cutting blade body, the cutting blade body rotates rearward around the support shaft of the frame.

The specific configuration of this conventional safety device 3 is as shown in FIGS. 6 to 9, in which a front frame body 3B having a retaining protrusion 3A is connected to a lower link of a tractor by a lower link pin. The rear of the operating rod 3C housed in the frame body is pivotally connected to a bracket fixed to the frame of the reaper with a pin, and the front of the operating rod is provided with an engaging pawl 3E pressed by a spring 3D to provide a safety device. When the blade is not in operation, the claws and protrusions are engaged by the pressure of the spring, but when the cutting blade hits an obstacle during work, the cutting blade rotates backward around the spindle. As a force is applied to the mower, the claw is pushed upward by the protrusion due to the impact force and detached, the operating rod slides backward, and the cutting blade rotates backward to avoid the shock of the obstacle. It is something.

The present invention is a further improvement on this known safety device, and provides a safety device in a compact form so that it can be installed even in a narrow and limited space of the frame.
Moreover, although it is compact, it has a large escape angle when the safety device is activated.
This will be explained below based on the drawings.

1 is a safety device in the reaper of the present invention.

The configuration is as follows: A downward sliding groove 1 of a frame IC, in which sliding grooves IA and IB with a C-shaped cross section are formed on the upper and lower surfaces.
A front actuating rod 1D is slidably fitted into B, and a pin hole 1E for insertion of the lower link pin 2 is bored at the tip of the front actuating rod, and a pin hole 1E for insertion of the lower link pin 2 is formed a little inside the pin hole. A projection 1F is provided protrudingly on the upper surface of the upper side position, and a rear operating rod 1G is slidably fitted into the upper sliding groove 1A of the frame, and a rear operating rod 1G is fitted to the rear end of the rear operating rod. Bracket attached to frame 2A) Pin hole 1H that passes through pin 2C connected to frame 2B
is bored, and the tip has an engaging claw 1■ that engages with the above protrusion.
A small hole 1J drilled in the engagement claw and a small protrusion 1 protruding from the upper surface of the rear operating rod are loosely fitted and connected, and the engagement claw is always connected to the above by a compression spring 1L acting downward. It is pressed against the rear operating rod.

In the figure, IA' and IB' are stoppers, 1D is a projection protruding from the front operating rod that engages with the stopper 1B', lL' is an adjustment screw, 1L'' is an adjustment nut, 2D is a tractor, and 2E is a The lower link, 2F is the spindle, 2G is the desk, and 2H and 2H' are the cutting blade bodies, respectively.

Next, to explain the function of the present invention, the reaper 2 only moves when the cutting blade collides with an obstacle during reaping work, or when a large amount of dense grass is entangled, that is, when the backward rotational moment exceeds a certain level. It rotates rearward around 2F to avoid the reaper 2 from obstacles in the field and protect the reaper 2 from impact loads.

If the tractor 2D is moved backwards on the spot, the reaper 2 will rotate forward around the support shaft 2F, and the entire safety device 1 will be compressed accordingly, so the rear operating rod 1G will be compressed.
slides forward, and the front actuating rod 1D slides backwards, so the tip of the engagement claw 1■ slides forward against the rear inclined surface of the projection 1F against the compression force of the compression spring 1L. As shown in the third figure, the engaging claw 12 engages and locks the protrusion 1F, and the entire reaping machine 2 assumes the reaping posture.

After this, the lower link 2E of the tractor is raised to raise the entire reaper 2 to avoid obstacles and protect the safety of the reaper 2.

Generally speaking, if this type of reaper hits an obstacle while working at 5 to 7 ksn/h, it will generate 800 to 1000 ksn/h.
It has been empirically known that it is desirable to set the compression force of the compression spring 1L using the adjustment nut 1L'' so that the reaper 2 rotates rearward due to the icg load (work resistance).

In this case as well, the compression force of the compression spring 1L is set so that the reaping machine 2 rotates rearward under a load (work resistance) of 800 to 1000 kg. Even if there is resistance, the safety device 1 will be activated, causing the reaper 2 to rotate backwards (the safety device is too effective), and if it is set to a value higher than the above, the safety device 1 will not activate (the safety device will not activate). (defective), which is unfavorable from a safety standpoint.

Since the present invention is constructed as described above, it has the following effects.

A: When the safety device is activated, the front operating lever and rear operating lever move forward and backward at the same time, resulting in twice the displacement of the conventional safety device, and the clearance angle of the cutting blade is larger than before. Therefore, even when the cutting blade body collides with an obstacle, the shock can be minimized.

B This safety device, which is installed between the tractor's lower link pin and the frame, provides a larger clearance angle than conventional devices, so the proposed device can be configured compactly, so it can be installed even in limited narrow installation locations. The proposed device can be easily installed, and a large relief angle can be obtained. In particular, according to the present invention, the installation dimension X between the tractor lower link pin and the reaper frame can be reduced, so the overall length of the reaper can be reduced. As a result, the center of gravity of the reaper is positioned forward, making it easier to raise and lower the reaper using the tractor lower link than before.
Even when the reaper is raised and moved by the tractor, the load on the front wheels of the tractor does not decrease, allowing safe driving.

W is the width of the reaper. D. All safety devices can be operated from the tractor seat.

In this case, there is no need to get off the tractor and operate the safety device every time the safety device is activated.

This is a useful device with many advantages.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a plan view of the entire reaper equipped with this device, Fig. 2 is a plan view of the proposed device, and Fig. 3 is a view taken along line A-A of the same. 4 is a sectional view taken along line A-A in FIG. 2 after operation;
Fig. 5 is a sectional view taken along line B-B in Fig. 3, Fig. 6 is a plan view of the conventional device, Fig. 7 is a sectional view taken along line C-C of the same as above before operation, and Fig. 8 is a sectional view of Fig. 6. FIG. 9 is a cross-sectional view taken along line C-C after operation, and FIG. 9 is a cross-sectional view taken along line D-D in FIG. 7. 1... Safety device, IA, IB... Slide groove, 1C... Frame, 1D... Front operating rod, 1E... ...Pin hole, 1F...
Protrusion, 1G... Rear operating rod, 1H...
Pin hole, 11...Engaging claw, IJ...Small hole, 1K...Small protrusion, 1L...Compression spring.

Claims (1)

[Scope of utility model registration request] A front operating rod is slidably fitted into the lower sliding groove of the frame, which has sliding grooves with cross-sectional openings formed on the upper and lower surfaces, and a lower link pin penetrates into the tip of the front operating rod. A pin hole is drilled for the purpose, a protrusion is provided on the upper surface at a position slightly inward of the pin hole, and a rear operating lever is slidably fitted into the upward sliding groove of the frame body. A pin hole is drilled at the rear end of the rear operating rod through which a pin connected to a bracket attached to the frame of the reaper is inserted, and an engaging claw that engages with the above-mentioned protrusion is drilled at the tip. The provided small hole and the small protrusion projecting on the upper surface of the rear operating rod are loosely fitted and connected, and the engaging pawl is constantly pressed against the rear operating rod by a compression spring acting downward. Features a safety device in the reaper.