JPS632497Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a safety device for a blade.

Snow removal work is carried out by driving a tractor at relatively high speeds, but when the blade of the blade hits a stone protruding from the road during snow removal, it is suddenly subjected to a large load, which can damage the blade or cause the tractor to suffer from the load. This has the disadvantage of causing damage to the tractor and, in some cases, the driver being thrown from the seat.

For this reason, Japanese Utility Model Publication No. 52-42530 and Publication of Utility Model Publication No. 51-17696 propose a method in which the blade is elastically supported, and when an obstacle is encountered, the blade is rotated against the elastic force. There is a device that prevents damage to the blade and the fuselage by doing so. However, a blade that has been rotated by an obstacle is subject to a restoring force from a spring, etc., and when the blade comes off the obstacle, it returns suddenly, making it extremely dangerous for workers. It is.

This idea was created in consideration of these points, and the purpose is to provide a safety device for the blade that will not only prevent damage to the blade and the machine body when an obstacle hits, but also pose no danger to workers. It is something to do.

This idea is based on a machine that runs on the ground, with a long rod that is rotatably connected to the rear end and protrudes forward.
A hydraulic cylinder is connected to this long rod, and a horizontally long blade is provided at the front of the machine body, and a connecting part is formed on the back of this blade by being positioned above the lower edge of the blade, and this connecting part and the above-mentioned The tips of the long rods are rotatably connected, and a locking part is fixedly formed at either the upper position of the back surface of the blade or the tip of the long rod, and The blade is characterized in that a locking pawl is attached to the other end of the long rod, the locking pawl resiliently engaging with the locking portion only when the blade is in the upright position. Therefore, when the lower edge of the blade collides with an obstacle, the locking pawl and the locking part disengage, and the blade becomes free to rotate around the connecting part with the long rod. Even if the blade comes off an obstacle, it remains free, so it does not move suddenly and is safe for workers and the like.

An embodiment of this invention will be described based on the drawings. First, a frame body 2 is connected to the front part of a tractor body 1, and a coupling tool 3 is connected to the front part of this frame body 2. A hydraulic cylinder 4 connected to a hydraulic system (not shown) of the aircraft body 1 is connected to this connector 3, and the rear end of a long rod 5 extending forward is rotatably connected. ing. A frame 7 connected to the rod 6 of the hydraulic cylinder 4 is fixed to the tip of the long rod 5, and a blade 8 is provided in front of the frame 7. That is, this blade 8 has a cutting portion 9 at the lower part. On the back surface of the blade 8, hinge pieces 10, which are two connecting parts arranged in the left-right direction, are formed so as to be positioned above the blade part 9, and at the same time, the hinge pieces 10 are positioned above the hinge pieces 10. Two support arms 11 facing each other on the left and right sides are formed. The hinge piece 10 is a hinge piece 13 which is a support part provided at the lower part of the frame 7 by a pin 12.
A locking pawl 14, which is a locking portion, is connected to the support arm 11 by a pin 15 so as to be vertically movable. These locking claws 14 have claw portions 16 at their lower edges. Further, these locking claws 14 facing each other on the left and right sides are connected by bolts 17. Furthermore, these locking claws 14 have plates 19 into which bolts 18 are screwed, and springs 21 are tensioned between one end of these bolts 18 and a spring hook 20 fixed to the back surface of the blade 8. It is set up. Two locking recesses 22 are formed in the upper part of the frame 7, and the claws 16 are elastically engaged with these locking recesses 22 by the force of the spring 21. .

In such a configuration, the hydraulic cylinder 4 is operated to move the machine body 1 forward while maintaining the floating state so that the blade part 9 follows the road.
to remove snow from roads. At this time, the blade part 9 may hit a stone protruding from the road, but if a large load is applied, the claw part 16 of the locking claw 14 will move into the locking recess 2.
2 to the blade 8 is connected to the pin 12 as shown in FIG.
The upper edge rotates forward using the fulcrum as a fulcrum. As a result, the blade 8 overcomes obstacles such as stones and the load on the blade portion 9 is removed, and the blade 8, the machine body 1, etc. are not damaged.

In order to reconnect such a blade 8 to the frame 7, the machine body 1 is moved backwards, and the blade part 9 catches on the road, causing the blade 8 to go up and the claw part 16 to re-enter the locking recess 22. It locks and automatically returns to its original connected state. Note that the claw portion 16 and the locking recess 22 with respect to the load applied to the blade 8
The engagement force with the spring 21 is applied by turning the bolt 18.
can be adjusted by varying the strength of the

Since this device is constructed as described above, when a load from a stone or the like is applied to the cutting edge of the blade, the locking part of the blade and the locking part of the machine body become detached, and the blade is tilted forward using the support part of the machine body as a fulcrum. Therefore, it is possible to remove sudden loads on the blades, prevent damage to the blades and the machine body, and protect the driver. Since the blade is in a free state when it is disengaged from the blade, it does not move suddenly even if it comes off an obstacle, and is highly safe for workers and the like.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a side view of the blade connected to the fuselage, FIG. 2 is a perspective view thereof, and FIG. 3 is a side view of the blade tipped forward due to a load. 1... Body, 8... Blade, 10... Hinge piece (connection part), 13... Hinge piece (support part), 14
...Latching claw (locking part), 22...Latching recess (locking part).

Claims (1)

[Scope of utility model registration request] A long rod whose rear end is rotatably connected to the body running on the ground is provided so as to protrude forward, a hydraulic cylinder is connected to this long rod, a horizontally long blade is provided at the front of the body, and this A connecting portion is formed on the back surface of the blade at a position higher than the lower edge of the blade, and the connecting portion and the tip of the long rod are rotatably connected, so that the upper position of the back surface of the blade and the long rod are connected to each other. A locking portion is fixedly formed on either one of the tip of the blade, and the locking portion is formed only in the upright position of the blade at the other of the upper position of the back surface of the blade and the tip of the long rod. A blade safety device characterized by having a locking pawl that engages elastically.