JPS6016279Y2 - brush cutter - Google Patents

Description

[Detailed description of the invention] The present invention uses centrifugal force to extend the end of the cut string wound and stored on a reel that rotates integrally with the rotating shaft, so that the end of the cut string can be extended radially. 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. 7, 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 locking pieces provided protruding from the reel 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 fixed to the rotating shaft again by the nut.

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

The present invention aims to improve work efficiency by making it easier to pull out the cutting cord when the cutting cord becomes worn out.

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

In FIGS. 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 section 11 is configured as follows.

That is, reference numeral 13 denotes a groove 17 in which the cutting cord 15 is wound and stored.
19 is a case that covers the outer periphery of the reel 13.

A rotating shaft 21 is rotatably supported by the gear case 5 and driven by the power of the engine 3, and is fitted into the case 19 via a spline 23.

Two cutting cords 15 are wound around the groove 17 in parallel, one end of which passes through a locking hole 25 provided near the bottom of the groove 17 and is locked therein, and the other end of which passes through the outer periphery of the case 19 and is locked therein. guide groove 27
is passed through and held at an appropriate length.

The reel 13 is rotatably fitted to the outer periphery of the cylindrical portion 29 of the case 19.

A protective cap 31 is screwed onto a threaded portion 32 at the lower end of the rotating shaft 21, and the shaft cylindrical portion 29 is clamped and fixed to the rotating shaft 21.

Reference numeral 33 denotes a locking piece that is slidably fitted into a support hole 35 provided in the case 19, and four long hole-shaped clearance portions 37 are provided at positions equally dividing the reel 13 into four in the circumferential direction. It can be freely engaged with.

When the locking piece 33 moves in the opposite direction to the end of the clearance part 37 in the direction of arrow B in FIG. , flat end portion 4
1 and is formed to be locked on the end face.

Further, the plane portion 41 is provided at a lower position than the upper surface portion 43 of the reel 13, and the corner portion 45 at the upper end of the end of the clearance portion 37 in the direction opposite to the arrow B is chamfered to an appropriate size. .

Numeral 47 is a spring for pressing the locking piece 33 downward, and 49 is a snap ring that restricts the lower limit position of the locking piece 33.

Reference numeral 50 denotes a holding device, which is constructed as follows.

That is, 51 is a ball that fits into a hole 53 provided horizontally in the locking piece 33, 55 is a bullet that presses the ball 51 outward, and 57
．． Reference numeral 59 denotes a groove provided on the inner periphery of the support hole 35. When the locking piece is at the lowering limit position, the ball 51 engages with the groove 57, and the tip of the locking piece 33 comes into contact with the flat part 41. When the ball 51 is in the groove 59, the ball 51 is engaged with the groove 59.

Note that the bullets 479 and 55 maintain their engagement state when the ball 51 is gently engaged with the groove 59, and release the engagement by applying an appropriate force. It is set.

Reference numeral 61 indicates a plurality of protrusions provided on the lower surface of the reel 13.

In the above configuration, the waist handle 7 drives the engine 3;
The operator grasps the grip part 9 with both hands and cuts grass, etc. using the mowing cord 15.15, which rotates in a radial manner outward from the rotating part 11, which rotates in the direction of arrow A in Fig. 3. be.

When the cutting cord 15 becomes worn out, the engine 3 is stopped, the finger of the hand is engaged with the protrusion 61 of the reel 13, and the reel 13 is rotated relative to the case 19 in the direction of arrow A in FIG. Then, the locking piece 33 moves in the direction of arrow B with respect to the clearance part 37.
The tip moves relatively in the direction of , and the tip climbs onto the flat part 41 via the inclined surface 39.

At this time, the ball 51 moves from the groove 57 to the groove 59. Next, when the reel 13 is rotated in the opposite direction, the ball 51 is engaged with the groove 59 and moves while being held, and the tip of the locking piece 33 is attached to the corner 45 at the opposite end of the free space 37. The locking piece 33
moves further upwards, and the tip ends up on the top surface 43 of the reel 13.

At this time, the ball 51 is located above the groove 59.

When the end of the cutting cord 15 is grasped and pulled outward, the reel 13
further rotates in the direction of arrow B in FIG.

Next, while pressing the upper end surface of the locking piece 33 with a finger, when the cutting cord 15 is further pulled outward, the lower end of the locking piece 33 moves on the slope 39, and the ball 51 moves along the groove 59. The locking piece 33 moves past the groove 57 and engages with the end of the clearance 37 in the direction opposite to the arrow B.

In this way, the cutting cord 15 of a predetermined length is pulled out, the locking piece 33 is locked to the end of the play area 37, and the reel 13 returns to the state where it can rotate as one unit with the case 19. .

Note that the structure of the holding part 50 is not limited to the above-mentioned embodiment, and the locking piece 33 is held in the released position using a link or a cam, and the corner part 45 of the clearance part 31 is held by the glue. Any configuration is sufficient as long as the holding is released at the upper surface position of the reel 13 and the bullet 47 presses the flat part 43 of the reel 13.

For example, the configurations shown in FIGS. 5 and 6 may be used.

That is, 63 is a swing piece provided on the shaft 65 so as to be swingable in the direction of arrow C in FIG. 5 and in the direction of the arrow in FIG. , 69 is a bomb that presses the swinging piece 63 in the direction of arrow A in FIG.
1.73 is an inclined portion provided on the swinging piece 63.

When the locking piece 33 moves from one end of the clearance portion 37 in the opposite direction (direction of arrow B in FIG. 3) and then moves back in the original direction (direction opposite to arrow B in FIG. 3), , a of FIG.

The posture changes to the posture a after passing through the postures shown in b, c, and d.

As described above, the present invention includes a reel having a groove for winding and storing the cutting cord, and a case that covers the outer periphery of the reel, and supports the reel and the case so as to be relatively rotatable. Also, one of the reel and the case is fixed to a rotating shaft, and a locking piece is provided for locking the relative rotational movement of the reel and the case in one direction through a clearance. Furthermore, since this brush cutter is equipped with a holding device for holding the locking piece in the release position by rotational movement in the opposite direction, it is easy to pull out the cutting string when the cutting string is worn out, and work efficiency is improved. This is something that can be improved.

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

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

Furthermore, Figure 7 shows the main parts of a conventional brush cutter.
77 is a locking piece provided on the reel 13, and 77 is a locking hole provided in the case 19, which are always engaged when the nut 79 is fixed.

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

[Brief explanation of drawings]

Figure 1 shows 1 of the present invention. A perspective explanatory view of the embodiment, FIG. 2, and FIG. 3 are a side cross-sectional view and a plane cross-sectional view of the main parts,
FIG. 4 is an enlarged side cross-sectional view of the main parts, FIGS. 5 and 6 are enlarged side and front views of the main parts of other embodiments, respectively, and FIG. 7 is the main parts of a conventional brush cutter. FIG. Explanation of symbols representing main parts of the drawing, 13...
・Reel, 15...Cut cord, 17...
Groove portion, 19... Case, 21... Rotating shaft, 33... Locking piece, 37... Clearance part, 50... holding device.

Claims (1)

[Scope of utility model registration request] A reel 1 equipped with a groove 17 for winding and storing a cutting cord 15
3 and a case 19 that covers the outer periphery of the reel 13, the reel 13 and the case 19 are supported relatively rotatably, and one of the reel 13 and the case 19 is rotated. Fixedly provided on the shaft 21,
A locking piece 33 is provided for locking the relative rotational movement between the reel 13 and the case 19 in one direction via a clearance 37,
A brush cutter further comprising a holding device 50 for holding the locking piece 33 in the release position by rotational movement in the opposite direction.