JPH056733Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a safety cover device for a brush cutter.
More specifically, the present invention relates to a safety cover device for a brush cutter that can easily remove grass, etc. caught between a rotary cutting blade and a safety cover during operation.

[Conventional technology]

In brush cutters, a safety cover covers the operator's side of the rotary cutting blade in order to prevent stones and the like from colliding with the rotating cutting blade and scattering toward the operator.

However, since the gap between the rotary mower blade and the safety cover is narrow, vines, grass, etc. get caught in the gap between the rotary mower blade and the safety cover due to the rotation of the rotary mower blade, and become clogged between the two. It may become impossible to rotate.

Therefore, in order to be able to remove vines and grass that are caught between the rotary mowing blade and the safety cover (scattering prevention cover), the safety cover is movable along the operating rod, so that it is attached to the projectile. Therefore, a structure in which the safety cover is urged toward the rotary cutting blade side is proposed62.
-45550 (Utility Model Application Publication No. 63-155322).

[The problem that the idea aims to solve]

By the way, even in this prior art, when the projectile is pushed back, vines and grasses get caught one after another between the rotary cutting blade and the safety cover, and increase in number without falling off. The operation of the hair removal machine has to be interrupted, which reduces work efficiency and is an issue that requires improvement.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings that correspond to the embodiments.

The brush cutter 10 of this invention includes a rotary cutting blade 18 at the front end of the operating rod 12 and a safety cover 26 that covers the operator side of the rotating cutting blade 18. An operating member 30 that is freely displaceable and operated by the operator
is provided near the worker during work.

A guide member 32 is provided for guiding the safety cover 26 in the front-rear direction of the safety cover device for a brush cutter, and the operating member 30 is comprised of a swingable operating lever 30 that can swing freely. , is connected to the safety cover 26 via a motion transmission member 58.

Further, a locking recess 50 provided in the guide member 32, a locking protrusion 54 disposed in the guide hole 52 of the safety cover 26 so as to be able to fit freely into the locking recess 50, and this locking protrusion a first biasing member 56 that urges the locking protrusion 54 in the direction in which the locking protrusion 54 fits into the locking recess 50; and a wire that constitutes the motion transmission member 58 and is coupled to the locking protrusion 54 at its tip end. 58 and
The second biasing member 68 biases the safety cover 26 forward, and the second biasing member 68 biases the safety cover 26 forward. It has a stopper 57 that ensures the entrainment of the safety cover 26 towards the movable lever 30.

[Effect]

When grass or the like gets caught in the gap between the rotary cutting blade 18 and the safety cover 26, the operator can move to a nearby operation without moving to the safety cover 26 at the front end of the operation rod 12. Operate member 30. The movement of the operating member 30 is transmitted via the motion transmitting member 58 to the safety cover 26, and the safety cover 26 is displaced relative to the rotary cutting blade 18 and the operating rod 12, that is, displaced relative to the caught grass, etc. etc. are removed. Furthermore, when the front end of the operating rod 12 is held upward to trim twigs, the operating member 30 is operated, and the safety cover 26 is thereby displaced from its original position to a position where it does not interfere with obstacles. becomes.

When the operator swings the operating swing lever 30, the motion transmission member 58 is displaced in the front-rear direction of the brush cutter 10, the safety cover 26 is moved away from the rotary cutting blade 18 toward the rear of the bush cutter 10, and the rotating mower Grass or the like caught between the blade 18 and the safety cover 26 will fall.

When the wire 58 is pulled toward the operating swing lever 30 by the operating swing lever 30, the locking convex portion 54
is pulled in from the locking recess 50 of the guide member 32 along with the wire 58 . Thereby, the safety cover 26 can be freely displaced with respect to the guide member 32 in the front-back direction. Additionally, as a result, the locking convex portion 54 comes into contact with the stopper 57 of the safety cover 26, making it difficult to move relative to the safety cover 26 despite the entrainment force of the wire 58. It moves toward the operating swing lever 30 against the second biasing member 68, that is, toward the rear. Thereafter, when the operating force from the wire 58 toward the operating swing lever 30 is released, the safety cover 26 is moved forward by the second biasing member 68, and the locking protrusion 54 is 1 biasing member 56
is displaced toward the locking recess 50, and the locking recess 50
to be inserted into. Thereby, the safety cover 26 is fixed to the guide member 32 in the front-back direction.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 4 is a schematic perspective view of the entire brush cutter 10. FIG. The brush cutter 10 includes an operating rod 12 that extends long in the front and back direction, and includes an engine power section 14 and a gear device 1.
6 is connected to the rear end and front end of the operating rod 12, respectively. The rotary cutting blade 18 is disposed below the gear device 16 and is fixed to an output shaft (not shown) of the gear device 16. The power transmission shaft 20 extends inside the operating rod 12, and the rotational power of the engine power section 14 is transmitted to the rotary cutting blade 18 via the power transmission shaft 20 and the gear device 16. The handle 22 is the operation stick 12
The suspension band 24 is attached to the operating rod 12 at a position closer to the engine power section 14 than the handle 22, and is passed over the shoulder of the operator. The safety cover 26 is attached to the front end of the operating rod 12 and covers the operator side of the rotary cutting blade 18, that is, the rear and upper rear half of the rotating cutting blade 18. The throttle lever 28 and the safety cover operating lever 30 are fixed to the right and left ends of the handle 22, and control the throttle opening of the engine power section 14 and the displacement of the safety cover 26, respectively.

FIG. 1 is an overall schematic diagram of a safety cover device for a brush cutter. The guide member 32 is fixed to the front end of the operating rod 12, and the safety cover 26 is supported by the guide member 32 so as to be freely displaceable in the front-rear direction of the brush cutter 10.
The wire member 34 extends along the handle 22 and the operating rod 12 in a range from the safety cover operating lever 30 to the guide member 32.

2 and 3 are a vertical cross-sectional view and a cross-sectional view showing the internal structure of the guide member 32. FIG. Guide member 3
2 is a hollow case 36 with a safety cover 26
A slide portion 38 at the upper end is disposed within the case 36 so as to be slidable in the front-rear direction of the brush cutter 10.
After housing the slide portion 38 into the case 36, the lid 42 is applied to the rear end opening of the case 36 and fixed to the case 36 with bolts 44. The bracket 46 fits into the upper half of the operating rod 12 and the bolt 4
8 is inserted through both left and right ends of the bracket 46 and then screwed onto the upper wall of the case 36 to fix the guide portion 32 to the operating rod 12. The locking recess 50 locks the slide portion 3 when the slide portion 38 is at the front end position.
They are formed on the left and right inner walls of the case 36, respectively, so as to face the guide holes 52 on the side surfaces of the case 36. The locking convex portion 54 is disposed within the guide hole 52 so as to be freely displaceable in the left-right direction of the brush cutter 10, and the locking convex portion 54 is disposed in the guide hole 52 at the distal end.
It is designed to fit and lock into the 0 position. The compression coil spring 56 biases the locking protrusion 54 in a direction in which the locking protrusion 54 projects toward the locking recess 50 . The stopper 57 is formed at the bottom of the guide hole 52,
It comes into contact with the locking protrusion 54 and restricts the movement of the locking protrusion 54 in the retracting direction. The wire member 34 is
Wire 58 and covering material 60 covering wire 58
The wire 58 has one end connected to the safety cover operating lever 30, and the other end inserted through the T-shaped passage 64 and the locking convex portion 54 of the slide portion 38 to fix the fastener 66. There is. The compression coil spring 68 has its center penetrated by the wire 58, and urges the slide portion 38 forward.

The operation of the embodiment shown in FIGS. 1 to 3 will be explained.

During normal work such as mowing, the safety cover operating lever 30 is in a position where the wire 58 of the wire member 34 is not pulled toward the safety cover operating lever 30. Therefore, within the guide member 32, the slide portion 38 is displaced forward by the compression coil spring 68, and the locking convex portion 54 in the guide hole 52 of the slide portion 38 is at a position facing the locking recess 50 of the case 36. The locking convex portion 54 is located on a compression coil spring 56.
is pushed out from the guide hole 52 by the locking recess 5
0 and is locked. As a result, the slide portion 38 is fixed to the case 36, the safety cover 26 is held at a position sufficiently close to the rotary cutting blade 18 in the front-rear direction of the brush cutter 10, and objects that collide with the rotating cutting blade 18 are removed from the work. Prevent it from scattering towards people.

When grass or the like gets caught in the gap between the rotary cutting blade 18 and the safety cover 26, the operator can remove the safety cover of the handle 22 without moving to the safety cover 26 at the front end of the operating rod 12. Operate the operating lever 30. As a result, the wire 5 of the wire member 34
8 is pulled toward the safety cover operating lever 30,
The locking protrusion 54 is pulled out from the locking recess 50 via the fastener 66 against the compression coil spring 56, and further,
Pull it into the guide hole 52. This results in case 3
6 and the slide part 38 are released, and the slide part 38 becomes able to be displaced rearward. As the wire 58 is pulled toward the safety cover operating lever 30 , the locking convex portion 54 comes into contact with the stopper 57 , and after this contact, the wire 58 pushes the slide portion 38 against the compression coil spring 68 . Move backwards. As a result, the safety cover 26 is appropriately separated rearward from the rotary cutting blade 18 in the front-rear direction of the brush cutter 10.
The gap between the rotary cutting blade 18 and the power transmission shaft 20 is increased, and grass or the like caught between the two is dropped downward.

Similarly, lift the front end of the operation stick 12 upwards,
When cutting twigs, etc., use the safety cover operation lever 3.
0 is operated to move the safety cover 26 to the rear of the brush cutter 10 to avoid a situation where the safety cover 26 hits another obstacle and becomes a hindrance.

[Effect of idea]

During work, the operator operates the operating member at hand without moving to the safety cover, and moves the safety cover in the front-back direction of the brush cutter relative to the operating rod and rotary cutting blade, and rotates the safety cover. Displaced around the support point. Therefore, vines, grass, etc. caught between the rotary cutting blade and the safety cover can be efficiently removed without interrupting work. Further, since the operator does not need to touch the safety cover, safety is high, and grass and the like can be removed while the prime mover remains in operation.

Furthermore, since the safety cover is displaced to the rear of the brush cutter, when removing vines, grass, etc. caught between the safety cover and the rotary cutting blade, the distance between the two increases, making it difficult to ensure that the grass, etc. is removed. I can do it. moreover,
Since the motion transmission member connects the safety cover that is displaceable in the front-rear direction and the swingable operation lever, the motion transmission member only needs to extend almost along the operation stick, and the structure of the motion transmission member can be changed. It can be done easily.

Furthermore, by fitting the locking protrusion into the locking recess of the guide member, it is possible to prevent the safety cover from shifting in the front-rear direction of the brush cutter during work, thereby preventing problems caused by displacement of the safety cover during work. be able to.

[Brief explanation of the drawing]

Figures 1 to 3 relate to the first embodiment of this invention, Figure 1 is a general schematic diagram of a safety cover device for a brush cutter, and Figures 2 and 3 are longitudinal sections showing the internal structure of the guide member. A cross-sectional view and a cross-sectional view, and FIG. 4 is a schematic perspective view of the entire brush cutter. 10...Brush cutter, 12...Operation rod, 18...Rotary cutting blade, 26...Safety cover, 30...Safety cover operation lever (operation member, swinging lever for operation),
32... Guide member, 50... Locking recess, 54...
Locking convex portion, 56... Compression coil spring (first biasing member), 57... Stopper, 58... Wire (motion transmitting member), 68... Compression coil spring (second biasing member).

Claims (1)

[Scope of utility model registration request] In the brush cutter 10, the rotary cutting blade 18 is provided at the front end of the operating rod 12, and the safety cover 26 covers the operator side of the rotating cutting blade 18.
the safety cover 26, which is freely displaceable with respect to the
It consists of a guide member 32 that guides the safety cover 26 in the front-rear direction of the safety cover device for a brush cutter, and a swingable operating swing lever 30 that is swingable. is connected to the safety cover 26, and the guide member 3
2, a locking protrusion 54 provided in the guide hole 52 of the safety cover 26 so as to be able to fit into the locking recess 50, and a locking protrusion 54 provided in the guide hole 52 of the safety cover 26; A first biasing member 56 that urges the locking protrusion 54 in the direction of fitting into the locking recess 50, and a wire that constitutes the motion transmission member 58 and is coupled to the locking protrusion 54 at its tip end. 58, a second biasing member 68 that biases the safety cover 26 forward, and a second biasing member 68 that limits the displacement of the locking protrusion 54 toward the operating swing lever 30 by the wire 58. and a stopper 57 for ensuring that the safety cover 26 is brought toward the operating swing lever 30 by the wire 58.