JPH0444031Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is for mowing grass, etc. using a cutting cord extending in the radial direction of a case that is rotationally driven by a prime mover via a rotating shaft. This relates to a rotary ivy for a brush cutter.

(Conventional technology) Conventionally, the technology in this field was to store the cord in a retainer.
When the cord becomes worn out, the engine can be stopped, the cut part can be partially disassembled, and the cord can be pulled out.
The reel can be moved by loosening the screw or, as shown in Japanese Patent Application Laid-Open No. 57-5608, by providing a pressing body at the tip of the cutter's mounting shaft to move the reel in the axial direction, and pushing this in during rotation. However, the reel and the housing are out of phase with each other due to the centrifugal force of the cord, and the cord is pulled out.

However, with the rotary cutter with the above configuration, the operation to pull out the cord is troublesome in the former case, and in the latter case, the pushing body is pressed while rotating, which causes the tip of the cord to drop and cause the cord to scatter pebbles, etc., which is dangerous. The presence of the pressing body increases the height from the ground to the cord, resulting in a higher cutting height.

Therefore, the applicant first proposed a rotary ivy described in the specification of Japanese Patent Application No. 61-93144.

In this inertial rotary cutter, a slider that is movable in the axial direction is constantly pressed by a spring, and a stopper provided on the slider engages with a rib on the retainer to stop the rotation of the reel. The shaft rotated against the spring, the retainer and slider were disengaged, and the centrifugal force of the cord caused the reel to rotate a predetermined amount, causing the cord to be fed out.

(Problem to be solved by the invention) However, when an attempt is made to pull out the cord during rotation, the tension is applied from the reel to the slider due to the centrifugal force exerted on the cord in the rotary cutter of the above mechanism, and the stopper of the slider is forced into the retainer rib. If the slider is crimped onto the locking portion, there is a problem in that the operation of the slider becomes uncertain depending on the magnitude of the impact force applied to the housing.

The present invention was devised in view of the above-mentioned problems with the conventional technology, and its purpose is to provide a reliable method that can be easily removed by lightly tapping or pressing the cutter against the ground, not only when the cutter is stopped but also when it is rotating. An object of the present invention is to provide a rotary ivy cutter for a brush cutter that can emit a predetermined amount of cord.

(Means for Solving the Problems) In order to achieve the above object, the rotary ivy for a brush cutter according to the present invention includes a retainer in which a reel for storing a cord is rotatably held between a housing that covers the lower part of the reel. On the other hand, a slider is arranged in the recess of the reel and is pressed against the retainer side by a pressure spring and swings only in the axial direction.
In a rotary cutter for a brush cutter configured such that a stopper provided on the slider and a rib provided on the retainer can be engaged, a shaft that is screwed onto the rotating shaft of the brush cutter body is inserted through the center of the retainer. In addition, a projection is integrally provided on the shaft and passes through a hole provided in the retainer to push the stopper of the slider.

(Function) The rotary cutter attached to the rotating shaft of the brush cutter normally cuts grass and weeds with a cord pulled out to a suitable length, but when the cord becomes worn and shortened, the housing slams into the ground. The protrusion of the shaft fixed to the rotary shaft of the brush cutter presses the stopper of the slider to facilitate disengagement from the radial ribs of the retainer.The slider also presses the retainer due to inertia by tapping the housing against the ground. The ribs disengage against the spring, and the phase between the housing and retainer is shifted, and the cord can be pulled out. When the rotary cutter is rotated, the cord is pulled by centrifugal force, and the reel is moved a predetermined amount (1 The cord is pulled out and the ribs of the slider and retainer engage again.
The reels rotate as one unit.

Therefore, in the present invention, even when the cutter is stopped or rotating, the cord can be reliably pulled out simply by lightly tapping or pressing the cutter against the ground, thereby eliminating the above-mentioned problem.

(Example) In FIGS. 1 and 2, a reel 1 has a storage section for a cord 2, and is rotatably held between a housing 5 covering the lower part of the reel and a retainer 4, and placed in a recess in the reel 1. A slider 7 that is pressed against the retainer 4 side by a push spring 9 and swings only in the axial direction is disposed, and a stopper 7a provided on the slider 7 and a radial rib 4 provided on the retainer 4 are arranged.
b is configured to be engageable. That is, the slider 7 is always pressed by the spring 9 so that the rib 4b of the retainer 4 and the stopper 7a of the slider 7 are engaged. Furthermore, although the slider 7 can move in the axial direction with respect to the reel 1 by means of the protrusion 7b, the slider 7 is configured so as not to be out of phase with respect to the rotational direction. Further, the retainer 4 and the housing 5 are fitted, for example, in a star shape (see Fig. 4) so that the positional relationship is always fixed, and the retainer 4 has a rotating shaft (not shown) of the brush cutter body in the center. A separate shaft 8 having a mounting screw 3 is fitted in such a manner that the positional relationship is constant, and the shaft 8 is fixed to the housing 5 with a bolt 6.

Next, a spring 10 is housed between the shaft 8 and the retainer 4, and the retainer 4 is movable only in the axial direction. hole 4c
The stopper 7a of the slider 7 is pressed against the stopper 7a of the slider 7. Incidentally, an elastic hook 4a is integrally provided on the retainer 4 at a corresponding position to the protrusion 8a provided on the shaft 8. The housing 5 has a pair of outlets for the cord 2 and a convex portion 7b of the slider 7.
Rib 5 which is circular and has an inclined surface at a position corresponding to
It has a. Note that the cord 2 is wound in the opposite direction to the rotation direction.

Next, its operation will be explained.

When the cord 2 becomes short due to wear or the like, the cutting quality deteriorates, so it is necessary to pull out the stored cord 2 from the reel 1.

Therefore, when the housing 5 is struck on the ground, the protrusion 8a of the shaft 8 fixed to the rotating shaft of the brush cutter, as shown in FIGS.
As shown in Fig. b, the slider 7 works to easily release the engagement with the radial ribs 4b of the retainer 4 by pushing the stopper 7a of the slider 7. Also, the slider 7 moves the retainer 4 due to inertia by tapping the housing 5 against the ground. The rib 4b is disengaged against the spring 9, and the phase between the housing 5 and the retainer 4 is shifted, and the cord 2 can be pulled out. When the rotary cutter is rotated, the cord 2 is pulled by centrifugal force and reeled. 1 rotates by a predetermined amount (1 pitch) and cord 2 is pulled out. Then, the slider 7 and the rib 4b of the retainer 4 engage again, and the reel 1 rotates as one unit.

(Effects of the invention) As explained in detail above, according to the invention, when the conventional product hits the bottom of the housing (bottom of the cutter) on the ground, the above-mentioned problem occurs, and the cord may not come out properly in some cases. Ta.

However, according to the present invention, even when the cutter is rotating, the projection 8a of the shaft 8 is used to stop the stopper 7a of the slider 7.
By pushing and promoting the axial movement of the slider by crimping, it is possible to reliably send out a predetermined amount of cord, and by providing the protrusion 8a on the shaft 8, there is no need to increase the number of parts, and the retainer 4 and shaft 8 can be disassembled. It is possible to exchange codes without having to do so. In addition, with the present invention, even when the cutter is stopped or rotating, the cord can be reliably ejected simply by lightly tapping or pressing the cutter against the ground.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the rotary ivy of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view of the rotary ivy in operation, and Fig. 4 is taken from A-A in Fig. 1.
The enlarged cross-sectional views, FIGS. 5a and 5b, are operation explanatory views taken along the line BB in FIG. 4. 1... Reel, 2... Cord, 3... Mounting screw, 4... Retainer, 4b... Rib, 5... Housing, 7... Slider, 7a... Stopper, 8
...Shaft, 9,10...Spring.

Claims (1)

[Scope of utility model registration request] The reel that stores the cord is held by a housing that covers the lower part of the reel and a retainer that is rotatably held between the reel and the reel.On the other hand, in the concave part of the reel, there is a slider that is pressed against the retainer side by a pressure spring and that swings only in the axial direction. A rotary cutter for a brush cutter is configured such that a stopper provided on the slider can engage with a rib provided on the retainer, and the rotary cutter is screwed onto the rotating shaft of the brush cutter main body at the center of the retainer. 1. A rotary ivy cutter for a brush cutter, characterized in that a shaft is inserted through the shaft, and the shaft is provided with an integral protrusion so as to pass through a hole provided in a retainer and press a stopper of the slider.