JPH01218513A - brush cutter - 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 Field of Application] The present invention provides a method for attaching the proximal end of a shank pipe to a prime mover.
This invention relates to a brush cutter in which a rotating body is completely attached to the tip end via a gear housing, and a cord led out in the radial direction from the rotating body is used to cut grass, etc. using centrifugal force when the rotating body rotates.

[Conventional technology]

BACKGROUND ART Conventionally, there has been a brush cutter that performs brush cutting work by leading out a cord made of, for example, synthetic resin from a rotating body that is rotated and driven by an output shaft connected to a prime mover. There is also a device that is equipped with a cord feeding means that sequentially feeds out the cord from a rotating body when the cord is worn out and shortened due to IJ removal work.

This includes, for example, a brush cutter as shown in FIGS. 6 to 8. Note that the same parts as those of the present invention shown in FIGS. 1 to 5 are designated by the same reference numerals.

That is, the rotating body 4 includes an upper container 6A and a lower container 6B, which are driven by an output shaft 5 connected to the prime mover 2, and a rotating body 4 that is rotatable about the output shaft 5 and slidable in the axial direction. The cord 20 is attached to the inside of the rotating body 4 by being biased by a spring 8 so that
A reel body 7 whose end portion is led out of the rotating body 4 by protruding, and a reel body 7 that is configured to integrate the reel body 7 and the rotating body 4 when the rotating body 4 rotates. a locking means 11' comprising an engaging protrusion 12' removably provided on the lower surface of the rotating body 7 and the opposing surface of the rotating body 4; and an engaging recess 13' in which the protrusion 12' is removably engaged; code 2
In order to reel out the 0, an engagement voice part 23' that is detachably provided opposite the upper surface of the reel body 7 and the upper inner surface of the rotating body 4, and an engagement recess 24' that is engaged therewith. It consists of a locking means 21' for stepping.

As shown in FIG. 8(a), the reel body 7 and Rotating body 4
are integrated, the rotary body 4 rotates in the direction of the arrow, and the cord 20 extending from the outlet hole 6C is extended by rotational centrifugal force to perform the mowing operation.

When the cord 20 is worn out and the reel operation is performed, as shown in FIG. When the reel body 7 is raised, the engagement protrusion 12' of the reel body 7 rises from the engagement recess 13' of the lower container 6B, and at the same time the engagement is released. The engaging protrusion 23' enters the engaging recess 24' provided on the upper inner surface of the upper container 6A of the rotating body 4.

In this state, when the reel pushing part 7a is released from the ground, the reel body 7 is biased by the spring 8 and moves downward, so the engaging protrusion 23' provided on the upper surface of the reel body 7
At the same time as the reel body 7 separates from the engagement recess 24' provided on the inner upper surface of the upper container 6A, the engagement protrusion 12' provided on the lower surface of the reel body 7 engages the engagement recess 13' provided opposite to the lower container 6B.
The reel body 7 rotates until it engages with the cord 20, and the cord 20 is fed out one step at a time by centrifugal force.

[Problem to be solved by the invention]

The above conventional brush cutter has an upper container 6A that forms the rotating body 4.
The lower container 6B has a locking claw 6BI provided on the peripheral wall of the lower container 6B in a locking hole BAl formed in the peripheral wall of the second upper container 6A at a location far away from the output shaft 5 as the center of rotation. When the rotating body 4 (upper container 6A, lower container 6B, and reel body 7) rotates during mowing work, the centrifugal force is most strongly applied at the attachment point. Since vibrations are applied to the rotating body 4 during work, the engaging claw 6 is removed from the locking hole 6A1.
There is a risk that Bl will become disengaged and be damaged.

Further, the upper container 6A and the lower container 6B that constitute the rotating body 4, and the reel body 7 that is installed inside the rotating body 4.
The three parts are assembled without precise positioning for assembly. Therefore, when the cord 20 is fed out, the engaging protrusions 12' are provided on the upper and lower surfaces of the reel body 7.

23' does not smoothly engage with the engaging recesses 13' and 24' provided on the opposing surfaces of the upper container 6A and the lower container 6B, respectively, and the feeding operation of the cord 20 is not performed smoothly, causing problems. Further, there is an inconvenience that the cord 20 is carelessly played out.

In addition, the outlet hole 6C provided on the side surface of the upper container 6A during assembly.
Since the installation position of the cord 20 is not constant, the length of the end of the cord 20 fed out from the reel body 7 is not constant depending on the product, resulting in variations.

Furthermore, since the rotating body 4 is formed of two parts, the upper container 6A and the lower container 6B, as the number of parts increases, the volume of the lower container 6B increases and the weight increases. The feeding operation was inconvenient.

The present invention has been made to solve the above problems, and the mounting part of the rotating body is installed on the output shaft located at the location where the centrifugal force during rotation is the weakest, so that the centrifugal force between the container body and the reel body is reduced. The two are fixed by a fixing member fixed to the shaft end of the output shaft so that the fixation does not come off even if the output shaft is subjected to a shock. Moreover, it is possible to simultaneously and accurately assemble and position the reel body to the fixing member and the container body to the reel body, allowing for smooth cord feeding operations and for each step of cord feeding for all products. The quantity is constant, the precision is high, and the number of parts is small.
It is easy to manufacture and assemble, and is also lightweight, making mowing operations easy.

[Means to solve the problem]

To achieve the above object, the present invention provides a container body provided with an output shaft connected to a prime mover, a state in which the output shaft is integrally coupled with the container body by a spring biasing means, and a state in which the output shaft is coupled to the container body by a spring biasing means. A brush cutter comprising a reel body that holds the cord by being disconnected from the container body and switched to a state where the cord can be pulled out, and means for connecting and separating the container body and the reel body, A lower flange of the reel body is located at the lower open end of the container body to form a reel storage chamber, and below the lower flange is a reel pushing part for moving the reel body against the spring biasing means. A storage recess is provided in the center of the reel pusher, and the container body and the reel body are connected to each other in the storage recess.
As a means for separating, a positioning fixing member that can be fixed to the output shaft end located inside the container body is arranged.

It can also be used as a means of feeding out the cord wound around the reel body.
A tenth element in which the first engaging part formed on the reel body and the first engaging part formed on the fixed member engage with each other by the spring biasing means.
A second engaging portion formed on the upper surface of the reel body and a second engaging portion formed on the upper inner surface of the container body are engaged by the earth mooring means and the reel body that moves against the spring biasing means. and a second locking means, and the cord is fed out from the reel body one step at a time by the mutual engagement of the first and second locking means.

Furthermore, as a fixed member for positioning, there is a base consisting of a nut part and a grip part that can be screwed together with an output shaft formed of a bolt part located inside the container body, and a base part that is fitted and rotatably inserted into this base part. The locking ring part includes a first engaging part that is engaged with a first engaging part formed on the reel body, and a locking ring part for positioning the container body. A third engaging portion that can be engaged with the third engaging portion formed in the third engaging portion is provided.

[For production]

Since the brush cutter of the present invention is configured as described above, it includes a container body that is rotated by an output shaft connected to a prime mover, and a container body that is housed within the container body and is constantly biased downward by a spring biasing means. The reel body is assembled with a positioning fixing member that is fixed to the end of the output shaft where centrifugal force is the weakest, so even if the container body and reel body rotate during mowing work or are subjected to vibrations during work, The container body and the reel body are firmly assembled and cannot be easily removed. Therefore, the cord can be smoothly fed out from the reel.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view of a brush cutter embodying the present invention. In the figure, l is an auxiliary pipe having a grip 1a, 2 is a prime mover attached to the base end of the auxiliary pipe 1, and 3 is an auxiliary pipe 1. Gear housing 4 is attached to the tip of the gear housing 3.
4 shows a rotating body that rotates via an output shaft within the rotating body 4.
is configured to be rotated by the prime mover 2 via a clutch mechanism, a drive shaft passing through an auxiliary pipe 1, and a transmission mechanism (not shown) such as a chain wheel.

As shown in the vertical cross-sectional view of FIG. 2, the rotating body 4 is attached to the output shaft 5 in the gear housing 3 and has an open end 6a at the bottom to form a reel storage chamber therein. A lower part 7 flange 19b (described later) is attached to the open end 6a so that the lower reel pushing part 7a protrudes into the container main body 6, and a spring 8 interposed in the container main body 6 constantly Reel body 7 energized downward
It is formed from.

9 connects the container body 6 and the reel body 7 to the output shaft 5.
This fixing member 9 is provided with a substantially cylindrical nut part 10a in the center which can be freely screwed into the bolt part 5a provided below the output shaft 5, and the lower surface has a rotating part. A base 10 provided with a grip portion 10b is removably engaged with an engaging portion 12 on the lower surface of the reel body 7 so as to constitute a first locking means 11 that is integrated with the reel body 7 on its outer periphery. A cylindrical portion 6b inside the container body 6 is provided on the inner periphery.
A locking ring portion 17 is formed coaxially with an engaging portion 16 that is removably engaged with an engaging portion 14 formed on the lower surface to constitute a third locking means 15. The stop ring part 17 is rotatably placed on the upper surface of the base part 10 and is attached to the nut part 1.
The upper end is attached by an O-ring 18 attached to Oa so that it cannot be pulled out, and only the base 10 is independently rotatable, and the nut part 10a is screwed into the bolt part 5a.

19a is an upper flange of the reel main body 7, and 19b is a lower flange, both flanges 19a.

19b, two cords 20 made of synthetic resin are wound in a direction opposite to the rotating direction of the rotating body 4, and one end of each cord 20 is connected to two leads provided on the outer peripheral wall of the container body 6. Hole 6
It is pulled out from C.

Reference numeral 7b denotes a cylindrical spring receiving portion provided on the upper inner periphery of the main body of the reel 7 for interposing the lower end of the spring 8 therein.

Reference numeral 7C denotes a storage recess provided on the lower surface of the reel main body 7 for accommodating the fixing member 9. The fixing member 9 is loosely fitted into the storage recess 7C and guided in the axial direction by its inner wall. The screwing operation of the nut part tOa to the bolt part 5a of the output shaft 5 is performed smoothly, and the fixing member 9 is prevented from being exposed to the outside from the lower part of the reel body 7, causing unsightly appearance and wear. .

The engaging portion 14 is connected to the reel body 7 as shown in FIG.
It is formed inside and above the storage recess 7C provided on the lower surface of the housing.

゛Thus, the outer inner bottom wall of the container body 6 to which the spring 8 is attached and the upper flange 19a of the reel body 7 are opposed to each other, and the second locking means 21 as a stepping mechanism for the reel body 7 is formed. is formed in an annular shape, and the lower surface of the reel body 7 and the cylindrical portion 6b of the container body 6 are respectively engaged with the fixing member 9, so that the reel body 7 is engaged with and detached from the first locking means. 11 and the third locking means 15 to which the container body 6 is engaged and detached are formed in an annular shape.

The locking means 21 as a stepping mechanism has an annular circumference of 8
The first and third locking means 11 and 15 are composed of equally divided serrated advancing pawls 23 and 24, and moreover, the first and third locking means 11 and 15 are serrated engagements having a tapered surface on one side of the annular circumference divided into eight equal parts. Part 1
2.14, and a sawtooth-shaped engagement portion 13.16, which is formed by dividing the circumference of an annular ring into eight equal parts. In this embodiment, the saw teeth of the engaging portions 13 and 16 are in opposite directions, but the saw teeth of the advancing pawl 23 and the engaging portion 16 are in the same direction, and their tapered surfaces are formed in the direction in which the cord 20 loosens. ing.

A part of these developed views is shown in FIG.

FIG. 3(A) shows that the reel main body 70 advancing claw 24 is disengaged from the container main body 60 advancing claw 3 due to the downward bias of the spring 8, and the engaging portion 12 of the reel main body 7 is engaged with the fixing member 9. It shows a state in which it has been fitted into and engaged with the mating portion 13.

When the engaging portions 12 and 13 are engaged with each other, the rotating body 4 (the container body 6 and the reel body 7 fixed to the container body 6 with the fixing member 9) rotates in the direction of the arrow. The mowing operation is performed by centrifugal force of 200 rotations of the cord extending from the outlet hole 6C.

At this time, as described above, the cord 20 is wound around the reel body 7 in the direction opposite to the direction of rotation of the rotating body 40, so even if centrifugal force is applied to the extending portion of the cord 20, the winding will not loosen. No.

In addition, as shown in the drawing, the advancing pawls 23, 24 and the first.
The formation of the engaging portion 12.14 as the third locking means 11.15 and the engaging portion 13.16 is as follows: (a) Stepping pawl 23.
The serrated tapered surface 24 is formed so that the rotation direction of the reel body 70 is in the direction in which the winding of the cord 20 is loosened.

(b) The vertical side of the advancing pawl 23 and the vertical side of the engaging part 13 of the first locking means 11 are formed in the same phase, and a part of the tapered surface of the advancing pawl 24 is formed in the same phase as the vertical side of the engaging part 13 of the first locking means 11. The phases are different so that they precede the vertical sides by a distance d, and the width of the tapered surface of the engaging portion 12 is formed to be larger than the distance d.

This is to ensure that the reel main body 7 rotates in one step, as will be described later.

(C) When the IJ-rule main body 7 is engaged with the fixing member 9, the separation distance between the advancing claws 23 and 24 is formed to be smaller than the depth H of the engaging portion 13.

This is to prevent the reel body 7 from idling when the rotating body 40 rotates.

FIGS. 3(B) to 3(D) show the manner in which the cord 20 is fed out.

That is, when the rotation of the rotating body 4 is stopped (the motor 2 is kept in an idling state) and the reel pushing part 7a is pressed against the ground, etc., the reel body 7 resists the spring 8 as shown in FIG. 3(B). The stepper claw 2 of the container body 6 moves upward in the direction of the arrow.
3, the advancing pawl 24 of the reel main body 7 contacts for the distance id, and the engaging portion 12 is disengaged from the engaging portion 13.

When the pressure of the reel pushing part 7a against the ground is further strengthened, as shown in FIG.
3 moves to the left as shown by the arrow along the advancing pawl 24, that is, the reel body 7 rotates by one step in the direction in which the cord 20 is loosened and then stops.

Therefore, the winding of the cord 20 is loosened by l steps.

When the reel pusher 7a is released in this state, the third
As shown in FIG. It moves to the left by the sliding of the tapered surface of and returns to the state shown in FIG. 3 (A>).

Then, when the rotation of the rotary body 4 is resumed, the loosened portion of the cord 20 (length corresponding to one step of the advancing claws 23 and 24) is moved to the rotary body by the centrifugal force accompanying the rotation of the reel body 7.
It is automatically fed out from the outlet hole 6C.

In addition, in the embodiment, the advancing pawls 23, 24 and the engaging portion 1
Although eight engaging portions 2.14 and eight engaging portions 13.16 are formed, an appropriate number may be used in consideration of the length of the cord to be fed out per step.

Further, in the embodiment, the vertical sides of the advancing pawl 23 and the vertical sides of the engaging portion 13 are formed in the same phase, so that when the engaging portion 13.16 and the engaging portion 12.14 are engaged, the advancing pawl 23 Although each phase was set so that a part of the tapered surface of the stepping pawl 24 precedes the vertical side of the stepping pawl 24 by the distance d, each vertical side of the stepping pawl 24 and the engaging portion 12 are formed to have the same phase, Even if each phase is set so that the vertical side of the engaging part 13 precedes the vertical side of the joining part 12 by the distance d, the same effect can be obtained.

〔effect〕

Since the present invention is configured as described above, it produces the effects described below.

(b) According to the brush cutter of claim 1, the mounting portion of the rotating body is installed on the output shaft located at a location where the centrifugal force during rotation is the weakest, so that the container body and the reel body can reduce centrifugal force. In addition, since the reel body and container body are fixed by a fixing member fixed to the output shaft, the reel body is fixed to the fixing member, and the container body to the reel body is fixed. , assembly and positioning of the body can be performed accurately.

(b) According to the brush cutter of claim 2, the cord feeding means has a first engaging portion formed on the reel body and a first engaging portion formed on the fixed member by the spring biasing means. A first locking means that engages, a second engaging portion formed on the upper surface of the reel body by the reel body that moves against the spring biasing means, and a second engaging portion formed on the upper inner surface of the container body. Since the cord is formed from the second locking means that engages with the joint portion, the cord can be reliably fed out from the rotating body one step at a time due to the mutual engagement with the first and second locking means. Compared to conventional products, the rotating body is made up of two parts: the container body and the reel body, which has a reel pressing part that protrudes from the opening end of the container body under the force of a spring, so the rotating body is lighter in weight. Operation during mowing can be performed easily, the structure is simplified, manufacturing and assembly are simple, and the cost is low.

(c) According to the fixing member in the brush cutter of claim 3, the container body and the reel body can be fixed to the output shaft as the rotation center where the centrifugal force is the weakest, and the reel body and the reel body can be fixed to the fixing member. Since the assembly and positioning of the container body can be performed simultaneously and accurately, in order to feed out the cord, the first The cooperative action of engagement with the second locking means is ensured, and the cord can be fed out with high accuracy without any variation in the product.

Moreover, the fixing member itself has a simple structure and low cost.
The handling operation when fixed is simplified.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a brush cutter embodying the present invention, Fig. 2 is a vertical sectional view of a rotating body showing an embodiment of the present invention, and Figs.
(D) is a diagram of the operation of automatic cord feeding, Figure 4 is a plan view of the fixing member that constitutes this embodiment, Figure 5 is a half-sectional side view thereof, and Figure 6 is a diagram showing the structure provided with the cord feeding device. FIG. 7 is a vertical cross-sectional view of the rotating body; FIG. 8 (a) is a cross-sectional view of the reel integrally engaged with the lower container; FIG. (B) is a sectional view of the reel in a state where it is integrally engaged with the upper container. 1... Auxiliary pipe, 2... Prime mover, 4... Rotating body, 5...
... Output shaft, 6... Container body, 7... Reel body,
7a... Reel pusher, 7C... Storage recess, butt...
Spring, 9... Fixed member, 10... Base, 10
a... Nut part, 10b... Gripping part, 11... First locking means, 12... Engaging part, 13... Engaging part,
15... Third locking means, 14... Engaging portion, 16...
...Engaging portion, 21...Second locking means, 23.24.
...Stepping claw, 17...Latching ring portion, 20...Cord. Patent applicant: Shingu Shoko Co., Ltd. Figure 7 Figure 5 (b) Figure 8

Claims (3)

[Claims] (1) A container body provided with an output shaft connected to a prime mover,
a reel body that holds a cord and is switched between a state in which it is integrally connected to the container body by a spring biasing means and a state in which the cord can be pulled out by breaking the connection with the container body against the spring biasing means; In the brush cutter, the lower flange of the reel body is located at the lower open end of the container body to form a reel storage chamber, and the lower flange of the reel body is located at the lower open end of the container body. A reel pushing part for moving the reel main body against the spring biasing means is formed below, a storage recess is provided in the center of the reel pushing part, and the container main body and the reel main body are connected to the storage recess. - A brush cutter characterized by arranging a positioning fixing member that can be fixed to the end of the output shaft located inside the container body as a means for separating. (2) As a means for feeding out the cord wound around the reel body, the first engaging part formed on the reel body and the first engaging part formed on the fixed member engage with each other by means of a spring biasing means. 1
A second engaging portion formed on the upper surface of the reel body and a second engaging portion formed on the upper inner surface of the container body are engaged with each other by the locking means and the second engaging portion formed on the upper surface of the reel body by the reel body moving against the spring biasing means. Claim 1 comprising a second locking means that fits together with the second locking means.
Brush cutter mentioned in section. (3) As a fixed member for positioning, there is a base having a nut part and a grip part that can be screwed together with an output shaft formed of a bolt part located inside the container body, and a base part that is fitted into this base part and is rotatable. The locking ring part includes a first engaging part that is engaged with a first engaging part formed on the reel body, and a locking ring part for positioning. 2. The brush cutter according to claim 1, further comprising a third engaging portion that can engage with a third engaging portion formed on the container body.