JPS6033788Y2 - brush cutter - Google Patents

Description

[Detailed description of the invention] This invention uses centrifugal force to extend the end of the cutting cord wound and housed on a reel that rotates integrally with the rotating shaft, so that the end of the cutting cord can be used to weed grass. This relates to a brush cutter for carrying out grass cutting work such as.

Conventionally, this type of brush cutter has a reel with a groove for winding and storing the cutting cord, as shown in Fig. 5, and a case that covers the outer periphery of the reel, and this case is fixed to the rotating shaft. The reel was rotatably supported by the case, and the reel and the protruding locking pieces were fitted and locked into a plurality of locking holes provided at equal intervals in the case.

If the cutting cord is worn out during brush cutting work, loosen the nut that secures the case and reel to the rotating shaft to separate the reel and case, release the locking piece from the locking hole, and remove the cutting cord. Grasp the end of the reel and pull it out to rotate the reel.

When the locking piece reaches the position of the next locking hole, the locking piece is engaged with the locking hole, and the reel and case are again fixed to the rotating shaft with the nut.

However, this cutting cord is subject to severe wear and tear, and it is therefore necessary to frequently pull out the cord during mowing operations.
It was extremely troublesome to loosen the nut each time and perform the above-mentioned work, and it also reduced work efficiency.

Furthermore, Japanese Patent Application Laid-Open No. 52-22761 describes an invention having the following structure and operation as a prior art.

That is, the reel is provided in a case that is fixed to the rotating shaft so as to be freely movable in the axial direction, and the locking portion is configured to switch and engage with the locking portion at a different rotational position due to this special play action. To feed out the cutting cord, press the bottom cover of the rotating reel against the ground, lift the reel upward against the bullet, and release the locking part.
It is pulled by the centrifugal force of the cutting cord and is locked in the locking part,
When the pressure is released, the cutting cord is configured to be locked again at the locking portion at the next position by the centrifugal force of the cutting cord, and the cutting cord is paid out by a predetermined amount by this one reciprocating movement.

Namely, 1. This configuration is designed to feed out the cutting cord while it is rotating, and for preparation before starting work, or for inspection and maintenance, the rotation is stopped and the length of the cutting cord is adjusted to a predetermined size. When servicing the mower, it is a cumbersome task to pull out the cutting cord while keeping the cover pressed to the ground, and the locking part is located near the axis, making the structure complicated. It is.

In this invention, when the rotation is stopped and the case or reel is pressed, the locking part is released, and when pressed further, the inclined surface of the guide part comes into contact and rotates slightly in the direction of letting out the cutting cord. , the locking part is designed to remain in the released state even if you release the pressure, eliminating the troublesome operation of pulling the cutting cord while pressing the case or reel, and locking it by pressing the case. The cutting cord 1 can be pulled out by releasing the part and then releasing the hand pressing the case, which makes the work of unwinding the cutting cord extremely easy.
Furthermore, by providing the locking portion and the guide portion near the outer periphery of the side surface of the reel, the present invention attempts to provide a brush cutter with a simple structure.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

1 to 4, 1 is an outer pipe connecting the engine 3 and the gear case 5, 7 is a handle, and 9 is a grip.

11 is a rotating part rotatably supported by the gear case 5, and the power of the engine 3 is transmitted from a transmission shaft (not shown) provided through the outer pipe 1 to a bevel gear (not shown) in the gear case 5. ), the rotating part 11 is driven to rotate.

The rotating part 11 is constructed like a ridge.

That is, 13 is a reel provided with a groove 17 for winding and storing the cutting cord 15 between horizontal annular flange portions arranged vertically in parallel, and 19 is a case covering the outer periphery of the reel 13.

Reference numeral 21 denotes a vertical rotating shaft rotatably supported by the gear case 5 and driven by the power of the engine 3, into which the reel 13 is fitted via a spline 23.

Two cutting cords 15 are wound around the groove 17 side by side, one end passing through a locking hole 25 provided near the bottom of the groove 17 and being locked, and the other end passing through the outer periphery of the case 19. Guide hole 27
is passed through and held at an appropriate length.

29 is a protection tube that fits into the guide hole 27.

The case 19 is rotatably fitted and supported by the outer periphery of the reel 13 and the rotating shaft 21, and is provided so as to be freely movable in the axial direction of the rotating shaft 21.

31 connects the reel 13 to the rotating shaft 2 via the protective cap 32.
1, 33 is a first locking portion that protrudes near the outer periphery of the lower surface of the flange portion of reel 13, and 35 is a nut that is fixed to case 1.
The second locking portions of the thank-you letter are provided at positions that penetrate through the lower surface of the inner surface of the second locking portion 9 and face the first locking portions 33, and four of them are provided at equal intervals at the same circumferential position.

The first locking portion 33 is configured to engage with the second locking portion 35 when the case 19 is moved upwardly, and disengaged from the second locking portion 35 when the case 19 is moved downwardly. .

A bullet 37 is fitted between the reel 13 and the case 19, and urges the case 19 in a direction in which the first locking portion 33 locks with the second locking portion 35.

Reference numeral 39 denotes a first guide portion provided protruding near the outer periphery of the upper surface of the flange portion of the reel 13. When the case 19 is moved downward, the first inclined surface 41 on the upper surface moves toward the second guide provided on the case 19. The reel 13 is formed so as to come into contact with a second inclined surface 45 on the lower surface of the portion 43 to slightly rotate the reel 13 in the direction in which the cutting cord 15 is let out with respect to the case 19.

Four guide parts 43 on the case 19 side are provided at equal intervals on the same circumference.

In the above configuration, the engine 3 is driven and the handle 7
The user grasps the grip part 9 with both hands and cuts grass, etc. using the cutting cord 15,15 which rotates in a radial position outward from the rotating part 11.

When the cutting cord 15 is worn out, the engine 3 is stopped and
When the case 19 is pressed and moved downward by hand, the first locking part 33 disengages from the second locking part 35, and when the case 19 is further pressed and moved, the first inclined surface 41 of the first guide part 39 becomes the first locking part 33. 2
The case 19 comes into contact with the second inclined surface 45 of the guide portion 43 and rotates slightly in the direction of rewinding the cutting cord 15.

When the hand pressing the case 19 downward is released, the first locking portion 33
is in a position moved from the second locking portion 35 and is in a disengaged state.

Next, by grasping and pulling the end of the cutting cord 15, the cutting cord 15 is paid out, and when the first locking portion 33 reaches the next position, the second locking portion 35, the ammunition 37 The first locking portion 33 engages with the second locking portion 35 under the pressing force of
5 can be extended by a predetermined length.

As described above, since the present invention has the configuration as described in the claims, it is possible to facilitate the work of pulling out the cutting cord when the cutting cord is worn out, improve work efficiency, and furthermore, it is possible to improve the work efficiency. There is no need to pull the cutting cord at the same time when you release the lock by pressing the case etc. by hand when letting out the cutting cord. The feeding work becomes easier,
Furthermore, the structure is simple, and since the locking part is located near the outer periphery of the reel, the load is small, and it can be made lightweight from synthetic resin.

In this embodiment, the reel is fixed to the rotating shaft and the case is rotatably provided, but the case may be fixed to the rotating shaft and the reel is rotatably provided.

Further, the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments.

Furthermore, Figure 5 shows the main parts of a conventional brush cutter.
5 is a locking piece provided on the reel 13, and 55 is a locking hole provided in the case 19, which are always engaged when the nut 31 is fixed.

The same reference numerals as those shown in FIGS. 1 to 4 indicate the same components.

[Brief explanation of drawings]

Fig. 1 is a perspective explanatory view of one embodiment of the present invention, Figs. 2 and 3 are plan sectional explanatory views and side sectional explanatory views of the main parts, respectively;
4 is an explanatory cross-sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is an explanatory side cross-sectional view of the main parts of a conventional brush cutter. Explanation of symbols representing main parts of the drawing, 13...
・Reel, 15...Cut cord, 17...
Groove portion, 19... Case, 21... Rotating shaft, 33... First locking part, 35... Second locking part, 37... ...Ammunition, 39...First guide section, 43...Second guide section, 41...
...First slope part, 45... Second slope part.

Claims (1)

[Scope of utility model registration request] A reel 13 having a groove 17 for winding and storing the cutting cord 15 and a case 19 covering the outer periphery of the reel 13 are provided between the horizontal annular flange portions arranged vertically in parallel. and the case 19 are relatively rotatably supported, and one of the reel 13 and the case 19 is fixed to a vertical rotating shaft 21, and the reel 13 and the case 19 are connected to each other. The rotating shaft 2
A first locking portion 33 is provided near the outer periphery of the outer surface of the flange portion of the reel 13, and a first locking portion 33 is provided on the inner surface of the case 19. 33, the first locking portion 33
A second locking part 35 is provided that is detachably locked to the reel, a bullet 37 is provided between the reel and the case 19, and the bullet 37 is connected to the first locking part 33 and the second locking part 35. A first inclined surface 41 is provided to be biased in the direction in which the stopper 35 locks, and has a first inclined surface 41 aligned near the outer periphery of the outer surface of a flange portion of the reel 13 on the opposite side to the first locking portion 33. A guide portion 39 is provided, and a direction in which the first locking portion 33 and the second locking portion 35 are released in a relative rotational position where the first locking portion 33 and the second locking portion 35 lock is provided. A second guide portion 43 having a second inclined surface 45 is provided at a position facing the first inclined surface 41 on the inner surface of the case 19 when the case 19 moves relatively freely in the axial direction. The reel 13 and the case 19 are inclined so that the reel 13 and the case 19 can be rotated relative to each other in the direction in which the cutting cord 15 is fed out by abutting and pressing the second inclined surface 45 and the second inclined surface 45 against each other.・Brush cutter.