JPH0226268Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a partition piece in which cords are housed and wound in a single layer above a lid body attached to a drive shaft rotated by an engine. Set up multiple disks with
When cutting the cord, the multiple discs are rotated by an instantaneous strong impact of the lid on the ground without stopping the engine drive, and the cord can be delivered instantly and reliably, and the multiple discs are not engaged with the body. The present invention relates to a multi-disk support device for a brush cutter that can be quickly assembled and does not make the overall structure unnecessarily complicated.

[Conventional technology]

A conventional brush cutter equipped with multiple discs with partition pieces has the multiple discs mounted on the top surface of a lid screwed onto a drive shaft rotated by the engine, and a cylindrical body in the center of the multiple discs. While loosely mating with the drive shaft, the fitting formed on the upper end of the cylindrical body is
A structure has been proposed in which the drive shaft is removably fitted into an engaging portion of a fixed body through a boss that fits into the drive shaft. (For example, Minoru and Kaiaki
(Refer to Publication No. 61-186331) However, in the brush cutter of the type described above, when the multiple discs rotate due to the strong impact of the lid on the ground when cutting the cord during the cutting operation, the multiple discs Due to the frictional resistance between the mating element and the engaging part of the lid, the multi-disk itself may not rotate by the angle necessary to feed out the cord of the length necessary for cutting the grass.
Therefore, there is a risk that the mowing work will be hindered.

In order to avoid such troubles, the disk with the cord wrapped around it is constantly fixed with a spring-like body such as a coil spring.
To spring and urge the disc upward, and when cutting the cord, release the engagement between the disc and the lid body that holds and covers the resilient body by pressing the lid body, and rotate the disc. A brush cutter was proposed that could feed out a cord of the length necessary for cutting grass. (for example
(i) Japanese Patent Publication No. 15793 (1979), (ii) Actual Publication No. 15793 (1979)
(See Publication No. 4535) [Problem to be solved by the invention] In case (i) of the brush cutters mentioned in the previous section, when the torque acting on the reel around which the cord is wound is excessive, There is a concern that the stop piece on the winding frame side and the protrusion piece on the removable indexing member side will not be released from engagement, and therefore, there is a risk that a new cord will not be fed out even when the cord is cut. There are also. Also (ii)
In this case, it is possible to release the engagement between the lid and the reel around which the cord is wound by pressing the lid, and the cord can be fed out. It is difficult to securely engage the cord, resulting in unnecessary rotation of the reel, and there is a risk that the cord may be unwound to a length longer than necessary.

This invention was proposed in view of the above-mentioned drawbacks, and its purpose is to reliably disengage the multiple discs from the body while cutting the cord during cutting. It is an object of the present invention to provide a multi-disc support device for a brush cutter, which allows the multi-discs to be quickly engaged with the body after being fed out.

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the multi-disc support device for a brush cutter in this invention has a drive shaft with a removably attached lid attached to the lower end penetrated and fixed to a boss that can hang down at the center of the body, and a single-layer disk support device for a brush cutter. An appropriate number of multiple disks with partition pieces that house cords are loosely connected to each other, and an engaging element that can protrude from the upper plate of the multiple disks is made to freely engage and detach from the body. In a brush cutter in which the projectile projector stretched between the blades is constantly fired and energized upward, one side of the pusher whose midway or root part is pivoted inside the upper end of the body is attached to the upper plate of the multi-disk. The multiple disks can be freely rotated with respect to the body by pressing and lowering the upper plate with one side of the presser when the rotating lid body hits the ground, and the engaging element separates from the body. This is what I did.

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 1 to 4. First, in FIGS. The drive shaft 11 rotates through a group of gears (none of which are shown) in a gear case, which penetrates and is fixed to a boss b that hangs downward at the center of the body 31, which has a flattened U-shaped cross section. A male screw f carved into the lower end of the drive shaft 11 is inserted into the lid body 1.
3. The bulging part e at the upper end of the contact part T protruding downward ₂ is freely screwed into the central female screw, and the drive shaft 1
1. The body 31 and the lid 13 are integrally connected. Thus, the lower end of the boss b is set in close contact with the bulge e ₂ or at a predetermined interval, while the inner periphery of the multiple disk D ₂ with the partition piece 20 is loosely fitted to the outer periphery of the boss b. , this partition piece 2
A grommet r, in which a cord C made of a flexible material is wound and housed in a single layer in the spaces formed above and below the body 31, respectively, and the cord C is provided at a symmetrical position below the outer peripheral edge of the body 31. It is possible to feed it out from r. In addition, a coiled spring-like elastic body 16 stretched between the annular groove n along the outer peripheral edge of the bulged portion e ₂ and the annular groove z of the multiple disk D ₂ is always directed upward. At the same time, the gap 〓g formed between the lower plate 19 of the multiple disk D ₂ and the upper surface of the lid body 13 is projected to the outside of the inner peripheral edge of the upper plate 17 of the multiple disk D ₂ . Height of the attached engaging element 33
h is greater than ₀ . For example, an inverted U-shaped support piece g ₂ that can be integrally hung at a proper position inside the upper end of the body 31
The middle part of a substantially fan-shaped presser 32 is pivotally attached to the pin _y2 , and the engaging/disengaging part j of this presser 32 is made to freely engage and disengage from the engaging element 33, while the grommet r side The pressing part k is made heavier than the engaging and disengaging part j so that it can come into contact with the upper surface of the upper plate 17, and when the lid body 13 hits the ground, the upper surface of the upper plate 17 is pushed up by the pressing part k. By releasing the engagement between the engagement part j and the engagement element 33, the multiple disk _D2 can be freely rotated around the outer peripheral edge of the boss b.

In addition, in FIG. 1, when the multiple disk D ₂ is assembled to the body 31 and the lid 13, the lower plate 19
The setting position is shown by a dashed line (the same applies to FIG. 3, which will be described later), and v is a space formed between the support piece q ₂ and the boss b.

In FIGS. 3 and 4 of the second embodiment, the fuselage 4
Insertion holes i are formed at equal intervals along the circumference between the support piece q ₃ , which is in the shape of an inverted U-shape that can hang down at a proper place inside the upper end of the support piece ₁ , and the boss b, The root portion of a generally fan-shaped presser 42 (boss b side in FIG. 3) is pivoted to the pin y ₃ to be hung, and one side of the presser 42 (in this case, the grommet r side) so as to be able to come into contact with the upper surface of the upper plate 17 of the multiple disk D ₃ , and the engaging element 43 fixed and protruding near the inner peripheral edge of the upper plate 17 can be engaged and detached from the engagement hole i. This embodiment differs from the first embodiment in that there is no protrusion on the upper surface of the lid body 13 and no annular groove, but the other points are the same, so a description thereof will be omitted.

[action, effect]

Since this idea has the above-mentioned configuration, the first
In the embodiment, the engager 33 of the multiple disc _D2
is engaged with and held by the engaging/disengaging portion j of the presser 32 (see FIG. 2), and the upward elastic force of the projectile body 16 causes the body 31, the multiple disk D ₂ , and the lid body 13 to be integrated. It rotates together with the drive shaft 11 and performs the desired brush cutting operation using code C. However, when mowing the grass,
When the cord C is cut or damaged, the pressing part k of the presser 32 is heavier than the disengaging part j due to the strong impact on the abutting part T of the lid 13 without stopping the engine drive. As it descends, the upper plate 17 of the multiple disc D ₂ is pressed downward, while the engaging/disengaging portion j disengages from the engaging member 33, so that the multiple disc D ₂ rotates around the outer periphery of the boss b in a free state. Accordingly, chord C is automatically fed out via grommet r. At this time, the downward pressing time of the pressing part k of the pressing element 32 is short due to the centrifugal force when the multiple disc D ₂ rotates, and the upward elastic force of the elastic body 16 and the rotation of the multiple disc D ₂ are short. The engaging member 33 and the engaging/disengaging portion j of the pusher 32 engage with each other due to the movement, and the body 31 of the multiple disk D ₂
are once again integrally connected, and the newly fed cord C performs the mowing work. However, the pressing part k
Since the engaging and disengaging portion j is located on the opposite side to the support piece _q2 , the engagement and disengagement between the presser 32 and the engaging element 33 is ensured.
Moreover, the presser element 32 can quickly engage the multiple disk D ₂ due to the centrifugal force of the multiple disk D ₂ .

In the second embodiment, when the lid body 13 hits the ground, the pressing member 42 presses the upper plate 17 of the multiple disc D ₃ to press the multiple disc D ₃ downward, so that the engaging member 43 is not engaged. Upon leaving the entrance hole i, the multiple disk D ₃ rotates around the outer periphery of the boss b in a free state.
Cord C is automatically fed out via grommet r. At this time, the downward pressing time of the presser 42 is short due to the centrifugal force when the multiple disk D ₃ rotates, and the upward elastic force of the elastic force 16 and the rotation of the multiple disk D ₃ cause the engager 42 to press downward. 43 engages in the adjacent engagement hole i, the multiple disk _D3 and the body 41 are again integrally connected, and the newly fed cord C performs the mowing operation. Therefore, when the lid body 13 hits the ground, the presser 42 presses the upper plate 17 of the multiple disc D ₃ to ensure that the multiple disc D ₃ separates from the body 41, and as described above, the multiple disc D 3 ₃
The centrifugal force causes the engaging element 43 to quickly engage with the body 41.

In each of the first and second embodiments, even if the cord C is cut or damaged, the multiple disks are placed in a free state relative to the fuselage by hitting the lid 13 against the ground at a certain time without stopping the engine drive. Moreover, since the cord can be quickly and reliably fed out to a length that does not interfere with the mowing work, the mowing work can be carried out smoothly and continuously, and there is no risk of unnecessarily complicating the overall structure. Since there are no screws, members such as the body, drive shaft, lid, and multiple disks can be easily assembled and disassembled, and can be manufactured robustly and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the first embodiment when the components are disassembled;
Fig. 2 is a plan view of the main parts when the presser and the engager are engaged with each other, Fig. 3 is a longitudinal cross-sectional view of the second embodiment when the components are disassembled, and Fig. 4 is a cross-section taken along the line - - in Fig. 3. FIG. 2 is a plan view of a main part of a multi-disk. 11... Drive shaft, 13... Lid body, 16... Bullet body, 17... Upper board, 20... Partition piece, 31, 41
...Body, 32, 42...Press element, 33, 43...
...Engager, C...Code, _D2 , _D3 ...Multiple disk, b...Boss.

Claims (1)

[Scope of utility model registration request] A drive shaft with a removably attached lid at its lower end is penetrated and fixed to a boss that hangs down in the center of the body, and a multi-disc with an appropriate number of partition pieces that stores cords in a single layer is mounted on the boss. The engaging element that can protrude from the upper plate of the multi-disk is allowed to freely engage and detach from the body, while the projectile body stretched between the multi-disk and the lid is always directed upward and ejected. - In the energized brush cutter, one side of the pressers 32, 42, whose midway or root portions are pivotally mounted inside the upper ends of the bodies 31, 41, faces the upper cover 17 of the multiple disks _D2 , _D3 so as to be able to come into contact with the upper cover 17, Due to the strong impact of the rotating lid 13 on the ground, one side of the pressers 32, 42 presses and lowers the upper plate 17, causing the engagers 33, 43 to separate from the bodies 31, 41, thereby causing the multiple disks _D2 , _D3. A multi-disc support device for a brush cutter that is capable of freely rotating with respect to bodies 31 and 41.