JPS62208213A - Cord delivery apparatus of reaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a mechanism for attaching a prime mover to the proximal end of a long stem tube, and attaching a rotating body to the distal end via a gear housing. The present invention relates to a cord feeding device for a brush cutter that uses centrifugal force generated when a rotating body rotates to cut grass or the like using a cord drawn out in a radial direction.

[Conventional technology and problems]

Conventionally, in this type of brush cutter, as a means for feeding out the cord whose tip has been worn out and shortened due to brush cutting work,
A method that stops the rotation of the rotary body, releases the lock on the cord lead-out, grasps the tip of the cord, and pulls it out to an appropriate length (see, for example, Japanese Patent Publication No. 17651/1983), or a method that does not stop the rotation of the rotary body. , press the pressing body attached to the reel around which the cord is wound against the ground, etc. to release the lock between the rotating body and the reel, and the centrifugal force of the reel will rotate the reel against the step and automatically feed out the cord. things (e.g. Japanese Patent Publication No. 57-560)
(See Publication No. 8).

By the way, the former method has the disadvantage that the cord is pulled out manually after the rotation of the rotating body is stopped, and the cord is tedious to pull out. The cord is automatically fed out by pressing it against the ground, which is efficient, but since it uses centrifugal force, the locking mechanism for feeding out the cord against the step does not work properly, resulting in unnecessary There were disadvantages such as unwinding of a long length, and the work being carried out while the rotor continued to rotate, which was dangerous.

In view of the above points, the present applicant previously proposed the cord feeding device shown in FIG.
(filed on May 24, 1985).

That is, a cord 4 is wound around the output shaft 1 in a rotary body 2 driven by a prime mover via an output shaft 1, so as to be rotatable and slidable in the axial direction, and biased downward by a spring 3. A reel 5 is provided, and an upper flange 6 of the reel 5 is provided.
and the upper inner wall of the rotating body 2 are provided with serrated stepping claws 7 and 8 that rotate the reel 5 in the direction of loosening the winding of the cord. Concave and convex portions 10 and 11 each having a tapered surface for engagement are provided facing the inner wall, and a pressing portion 12 that protrudes from the lower surface of the rotating body 2 is provided at the lower part of the reel box,
To feed out the cord 4, stop the operation of the brush cutter and press the pressing part 12 against the ground, etc., and the reel 5 will rise against the spring 3, disengaging the uneven parts 10 and 11, and Due to the cooperative action of the stepping claws 7 and 8, the reel 5 automatically rotates in steps in the direction of loosening the winding of the cord and then stops.If the pressure on the ground is released and the operation is resumed, the above of cord 4 The loosened portion is automatically fed out by the rotational centrifugal force of the reel 5.

Therefore, the cord can be fed out more easily and reliably than the conventional two-sided cord, but it has been found that there are the following problems.

(a) Upper and lower flanges 6.9 of reel 5
Since the reel 5 is provided with a stepping pawl 7, an engaging convex portion 10, and a pressing portion 12, the molding process of the reel 5 is troublesome.

(b) Reel 5 connects to upper and lower flanges 6.9
Therefore, especially when the cord 4 is guided out from the rotating body 2 one by one in the diametrical direction (the cord 4 is bent in a U-shape from the center of its entire length, and the bent part (fixed to the body of the reel and wound in the same direction), the two cords intersect, impairing the smoothness of automatic feeding.

[Technology for solving problems]

The present invention relates to a rotary body driven by a prime mover via an output shaft, and a rotary body that is installed inside the rotary body, is rotatable and slidable in the axial direction on the output shaft, and is protruded downward from the rotary body by means of a spring. It consists of a cylindrical pressing body with a U-shaped cross section and a reel having a removable intermediate partition plate on the outer periphery of the pressing body, and an upper inner wall of the rotating body and an upper inner circumferential wall of the pressing body. A plurality of serrated ratchets are provided to rotate the pressing body in the loosening direction of the cord winding. A plurality of serrated ratchets for engagement are provided, and the ratchets provided on the upper inner wall of the rotating body and the upper inner circumferential wall of the pressing body are formed to have different phases by a gap d,
The ratchet provided on the lower inner wall of the rotating body and the lower surface of the flange of the pressing body is provided with a flat surface equal to the gap d.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a brush cutter embodying the present invention.
14 is a long handle tube having a grip 13a, and 14 is a handle tube 13.
15 is a gear housing attached to the tip of the handle tube 13; 16 is a rotating body that rotates via an output shaft within the gear housing 15; It is configured to rotate via a transmission mechanism (not shown) such as a clutch mechanism, a drive shaft passing through the handle tube 13, and a chain wheel.

As shown in the longitudinal sectional view of FIG. 2, the rotating body 16 includes an upper case 18 made of synthetic resin into which the boss 17a of the output shaft 17 in the gear housing 15 is fitted, and an upper case 18 made of synthetic resin. A lower case 19 made of synthetic resin is removably attached to the case 18 through two locking claws 19a that are engaged with and disengaged from two locking claws 18a provided on the outer peripheral wall of the case 18, and the lower case 19 is made of synthetic resin. A pressing body 20 made of synthetic resin that protrudes outward so as to be able to move up and down through a guide hole 19b bored in the center, and a synthetic resin wound cord that removably fits into the outer peripheral wall of the pressing body 20. It is composed of a reel 21 made of

Thus, the pressing body 20 has a cylindrical shape with a U-shaped cross section,
An annular guide wall 20b is formed in the center of the bottom wall 20a, and the boss portion 1 of the output shaft 17 is disposed within the kite wall 20b.
A guide shaft 22 screwed onto the guide wall 7a is fitted and inserted, and a coil spring 23 is interposed between the bottom wall 20a and the inner wall of the upper case 18 along the outer periphery of the guide wall 20b.
0 is urged to protrude outward from the lower case 19.

Further, as shown in the plan view of FIG. 3(A), the side view of FIG. 3(B), the rope sectional view of FIG. 3(C), and the rear view of FIG. On the lower surface of the collar 20c, eight serrated ratchets l-20d are arranged at equal intervals on the flat surface 20.
d, and furthermore, eight convex portions 20e are formed at equal intervals on the outer peripheral wall of the pressing body 20 above the collar 20c, and eight convex portions 20e are formed at equal intervals above the inner peripheral wall. Serrated ratchet! -2Of is formed in a ring shape.

A pressing body 20 is disposed at the center of the inner wall of the upper case 18 in cooperation with a ratchet 2Of formed on the inner circumferential wall of the pressing body 20.
Eight serrated ratchets 18b are formed in an annular shape for applying and rotating a step, and eight ratchets 18b are formed in the center of the inner wall of the lower case 19 to cooperate with ratchets 20d formed on the lower surface of the collar 20c of the pressing body 20. Serrated ratchet) 19c
is formed in an annular shape with a flat surface 19C1 interposed therebetween.

The reel 21 includes a body portion 21a, an upper flange 21b,
One each of two synthetic resin cords 24 having a lower flange 21c and an intermediate partition plate 21d and having a central bent portion of the entire length fixed to the intermediate partition plate 21d is attached to the upper and lower body parts 21a of the intermediate partition plate 21d. One end of each cord 24 is led out through an eyelet 25 having a slit fitted into the outer peripheral wall of the lower case 19.

At this time, the cord 24 is wound around the reel 21 in the rotational direction of the reel 21, that is, in the opposite direction to the rotational direction of the rotating body 16, so that the winding does not loosen even if rotational centrifugal force acts on the lead-out portion of the cord 24. has been done.

Further, as shown in the plan view of FIG. 4, a plurality of recesses 21e are formed at equal intervals in the longitudinal direction on the inner peripheral wall of the body 21a of the reel 21, and each recess 216 is provided with a The convex portions 20e formed on the wall fit together, and the reel 21 is detachably attached to the pressing body 20 and rotates together with the pressing body 20 in the same direction.

Next, each ratchet 18b, 20f and 19C, 2
The cooperative action of 0d will be explained using the developed diagram shown in FIG.

In FIG. 5(A), the pressing body 2 is moved by the coil spring 23.
0 is urged downward, the ratchet 20f of the pressing body 20 is disengaged from the ratchet 18b of the upper case 18, and the ratchet 20d of the pressing body 20 is engaged with the ratchet 19c of the lower case 19.

And the ratchet 19. and 20d, as the rotating body 16 rotates in the direction of the arrow, the pressing body 20 and the reel 21 fitted with the concave and convex portions on the pressing body 20 rotate integrally in the same direction, and the cord led out from the eyelet 25 rotates in the same direction. 24
Brush cutting work is performed by the rotating centrifugal force of the

As shown in the figure, the serrated tapered surfaces of the ratchets 18b and 2Of can be formed so that the rotation direction of the reel 21 is in the direction in which the winding of the cord 24 is loosened, and the phases are different by the gap d. be.

In addition, the flat surfaces 19CI and 20d interposed between the sawtooth tapered surfaces of the ratchets 19C and 20d form the gap d.
It is formed equal to .

FIGS. 5(B) to 5(D) show the manner in which the cord 24 is fed out.

When the rotation of the rotating body 16 is stopped (the prime mover 14 is placed in an idling state) and the outer surface of the bottom wall 20a of the pressing body 20 is pressed against the ground, as shown in FIG. 5(B), the pressing body 20 becomes a coil. The ratchet 20d rises in the direction of the arrow against the spring 23, and the ratchet 20d engages the ratchet 19c of the lower case 19.
The ratchet 20f comes into contact with the ratchet 18b of the upper case 18 by a gap d.

Note that the symbols ■ to ■ given to each ratchet are for clarifying the bonding relationship.

When the pressure of the pressing body 20 on the ground etc. is strengthened, the result shown in Fig. 5 (C
), the ratchet 20f slides along the serrated tapered surface of 18b and advances by -steps. Therefore, the pressing body 20 rotates by -step in the direction of the arrow, and the reel 21 also rotates in the same direction, loosening the winding of the cord 24.

Next, when the pressing body 20 is released, the pressing body 20 descends in the direction of the arrow due to the bias of the coil spring 23, as shown in FIG. The ratchet 19c comes into contact with the tapered surface of the ratchet 19c leaving the gap d, and then slides to the left by the gap d and stops, returning to the state shown in FIG. 5(A).

Then, when the rotation of the rotating body 16 is resumed, the loosened portion of the cord 24 is automatically let out from the eyelet 25 due to the centrifugal force accompanying the rotation of the reel 21.

At this time, each one of the cords 24 is connected to the reel 2 as described above.
Since it is divided by one intermediate partition plate 21d and wound around the body part 21a, it is smoothly unwound without crossing over.

In addition, in this example, each ratchet was set to eight, but -
It is also possible to select an appropriate number by taking into consideration the length of the cord to be fed out per step.

〔effect〕

The present invention has the following effects.

(a) Since the reel is removably fitted to the pressing body formed with a ratchet, molding of the reel is extremely easy.

(b) Since the reel has an intermediate partition plate, and the cords to be drawn out in different directions are divided and wound, automatic feeding of the cords is performed extremely smoothly.

(C) When the cord becomes worn out, the cord of a predetermined length can be automatically fed out by a simple operation of pressing the pressing body protruding from the rotating body against the ground or the like.

(d) Since the rotation of the rotating body is stopped when the cord is fed out, there is no danger, and the cord is certainly fed out in a length corresponding to the length per step.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a brush cutter embodying the present invention, Fig. 2 is a vertical cross-sectional view of the rotating body, Fig. 3 (A) is a plan view of the pressing body, and Fig. 3 (B) is a side view. (C) is a longitudinal cross-sectional view, (D) is a rear view, Figure 4 is a plan view of the reel, and Figures 5 (A) to (D).
) is an explanatory view of the cord feeding, and FIG. 6 is a longitudinal sectional view of the conventional example. 16...Rotating body, 18...Upper case, 18b...
・Ratchet, 19... Lower case, 19c... Ratchet, 20... Pressing body, 20c... Tsuba, 20d
... Ratchet, 20e... Convex portion, 20f... Ratchet, 21... Reel, 21d... Intermediate partition plate, 21e... Convex portion, 23... Coil spring, 2
4...Code. Patent Applicant: Shingu Commercial Procedures Co., Ltd. Voluntary writing of amendments) April 23, 1986, Wholesaler Public Relations Officer Uga Michibe 1, Indication of Case: 1986 Patent Application No. 04
8624 No. 2, Name of the invention: Brush cutter cord feeding device 3, Person making the amendment: Relationship with Hanyu Patent applicant address: 2-1-1 Inaho, Otaru, Hokkaido Name: Shingu Shoko Co., Ltd. 4: Contents of the amendment by the agent ( Japanese Patent Application No. 61-048624) 1, the description of "Claims" on pages 1 to 2 of the specification is amended as follows. A rotating body driven by a prime mover via an output shaft; It consists of a cylindrical pressing body with a U-shaped cross section and a reel having a removable intermediate partition plate on the outer periphery of the pressing body, which faces the upper inner wall of the rotating body and the upper inner circumferential wall of the pressing body, respectively. A plurality of serrated ratchets are provided to rotate the pressing body in the direction of loosening the cord winding, and are provided with a plurality of sawtooth ratchets for engaging the inner wall of the lower part of the rotary body and the lower surface of the collar formed on the outer peripheral wall of the pressing body, respectively. A cord feeding device for a brush cutter, characterized in that a plurality of serrated ratchets are provided, and the phase of each ratchet is set so as to precede the ratchet by a gap d.'' 2, page 4, line 6 of `` Insert ``in one'' after ``12''. 3. On page 6, lines 4 to 7, “The rotating body...
"Formation" is corrected as follows. "When the tapered surfaces of the ratchets on the outer peripheral wall of the pressing body and the ratchets on the lower inner wall of the rotating body come into contact, each ratchet is arranged so that the ratchet on the upper inner peripheral wall of the pressing body precedes the ratchet on the upper inner wall of the rotating body by a gap d. 4. Insert "(play)" after "r20d1" on page 8, line 5 and page 10, line 17. 5. After r19c+J on page 8, line 17, “(play)
” is inserted. 6. Correct "engagement" in line 4 of page 10 to "each tapered surface abuts". 7. "Engagement . . . arrow direction" on page 10, lines 6 and 7 is corrected as follows. "When the rotating body 16 rotates in the direction of the arrow with each tapered surface in contact, the ratchet 19 slides on the flat surface 20at (play) of the ratchet 20d and
The rotating body 16" 8, page 11, line 2, "state" is changed to [state. At this time, due to the inertia of the pressing body 20, the ratchet 20d is moved against the ratchet 19c.
Slide the flat surface 19ct (play) of the ratchet 1
It is in contact with the tapered surface of 9c. ” he corrected.

Claims (1)

[Scope of Claims] A rotating body driven by a prime mover via an output shaft, and a rotary body installed inside the rotating body so as to be rotatable and slidable in the axial direction on the output shaft and projected downwardly by a spring. It consists of a cylindrical pressing body with a U-shaped cross section and a reel having a removable intermediate partition plate on the outer periphery of the pressing body, the upper inner wall of the rotating body and the upper inner circumferential wall of the pressing body A plurality of serrated ratchets are provided to rotate the pressing body in the loosening direction of the cord winding, respectively facing each other, and facing the lower inner wall of the rotating body and the lower surface of the flange formed on the outer peripheral wall of the pressing body, respectively. a plurality of serrated ratchets for engagement are provided, and the ratchets provided on the upper inner wall of the rotating body and the upper inner circumferential wall of the pressing body are formed to have different phases by a gap d,
A cord feeding device for a brush cutter, characterized in that a flat surface equal to the gap d is formed on each ratchet provided on the lower inner wall of the rotating body and the lower surface of the flange of the pressing body.