JPH065696Y2 - Portable brush cutter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a handheld brush cutter having a structure in which a handheld brush cutter that can be freely operated by holding a handle is connected to a shoulder strap that supports the weight of the handheld brush cutter. Regarding improvements.

In the conventional brush cutter A of the above-described form, as shown in FIG. 1, a brush body a is usually composed of a drive mechanism section 1 and a cutting blade mechanism 2 which reciprocates in the longitudinal direction.
Assemble the engine E and the handle rod 3 to
It is configured by connecting the lower end of the shoulder strap 4 to the base end portion of the machine body a, so that when performing grass cutting work on the slope n of the ridge K, the upper end side of the shoulder strap 4 is When the operator M hangs on the shoulder, and the weight is supported thereby, the grips 3a, 3a of the handle rod 3 of the machine body a are attached to the operator M.
By operating the machine body a while holding it with both hands, it is possible to perform the mowing work while the weight of the machine body a is not so heavy on both hands.

By the way, in the shoulder-mounted portable brush cutter A of this embodiment, the length of the shoulder strap 4 and the length of the handle rod 3 can be adjusted to expand and contract. For example, in the state shown in FIG. When the height H of the slope n of the shore K is low and the tip of the cutting blade mechanism 2 catches on mud in the field, the length of the shoulder strap 4 is adjusted to be short and the length of the handle rod 3 is adjusted to be short. The operation can be performed with the machine body a slightly raised.

However, the adjustment of the lengths of the shoulder strap 4 and the handle rod 3 in order to adapt to this working state or working place is troublesome in that both of them have to be performed together, and the adjustments of both of them are mutually different. There is a problem in that it has to be performed in a state in which there is no excess or deficiency, and when there is an excess or deficiency, it is troublesome to readjust.

The present invention has been made to solve the problem that has occurred in the conventional means, and adjusts the support height of the machine body to the operator when the grip portion of the handle rod is gripped so as to adapt to the working situation. It is an object of the present invention to provide means for facilitating the operation to be performed.

And, in the present invention, as a means for achieving this object, a machine body including a cutting blade mechanism and a drive mechanism section is provided.
The present invention proposes a portable brush cutter for shoulder mounting, in which an engine and a retractable handle rod are assembled, and a shoulder strap connecting metal fitting is connected to the sliding machine frame side of the handle rod that is extended and retracted.

Next, embodiments will be described in detail with reference to the drawings. The same reference numerals as those used in the conventional means are used for the constituent elements having the same effect.

FIG. 2 is a side view of a shoulder-mounted portable brush cutter A embodying the present invention. In FIG. 2, a is a machine body, E is an engine assembled at the base end of the machine body, and 3 is a machine body a. The attached handle rods 4 indicate shoulder straps.

The machine body a includes a drive mechanism unit 1 and a cutting blade mechanism 2 supported by the drive mechanism unit 1. The drive mechanism unit 1 is a conductive case that also serves as a main machine frame that houses a reduction mechanism and a reciprocating mechanism inside, and is formed in a flat box shape that is long in the front-rear direction (left-right direction in FIG. 2).
A mounting seat for mounting the engine E is formed on the upper surface side, and the base end side of the fixed blade 20 of the cutting blade mechanism 2 is connected to the front end side. The cutting blade mechanism 2 is of a reciprocating type, which comprises a fixed blade 20 having a saw-tooth shape which is long in the front-rear direction and a moving blade 21 which overlaps with the fixed blade 20 and reciprocates in the front-rear direction. It is connected to and supported by a sheath-shaped guide portion 22 fixed to the front end of the mechanism portion 1. Further, the moving blade 21 has its base end side slidably supported in the front and rear direction by the sheath-shaped guide portion 22 and has a sheath-shaped guide portion on the reciprocating rod protruding from the drive mechanism portion 1. 22 are connected.

The engine E is an extremely small air-cooled two-cycle engine, and is integrally assembled to an assembly portion provided on the upper surface side of the drive mechanism unit 1, and in that state, the output shaft has the drive mechanism. It is in conduction with the input shaft of part 1.

As shown in FIG. 4, the handle rod 3 has a mounting machine frame 31 having a mounting seat 30 at its lower end, and a connecting shaft 3 at its upper end.
2 A cylindrical main machine frame 33 that is pivotally connected up and down about the center
And a sliding machine frame 34 slidably fitted to the sliding machine frame 34, and left and right grip portions 3a, 3 assembled to the outer ends of the sliding machine frame 34.
a and connects the mounting machine frame 31 and the main machine frame 33 to the connecting shaft 3
In the normal state, in the fixed state, a large force equal to or larger than a certain load that can be adjusted in a desired manner is applied to the connecting portion connected by 2 in the rotating direction about the connecting shaft 32, so that the connecting portion is attached by a desired angle amount. A seat plate made of a spring material is interposed so that the main machine frame 33 rotates with respect to the machine frame 31. In addition, the main machine frame 33
As shown in FIG. 5, an eccentric cam 351 that rotates about the support shaft 350, an operation lever 352 provided on the eccentric cam 351 and an eccentric cam 351 that rotates when the operation lever 352 rises upright as shown in FIG. Thus, a fastener 35 composed of a crimping plate 353 made of a spring plate that is crimped to the peripheral surface of the sliding machine frame 34 fitted in the main machine frame 33 is installed.
Further, the left and right grips 3a, 3a assembled to the outer end of the sliding machine frame 34 include a set bolt 36 and a tightening nut 37.
A seat plate made of a spring material is also interposed in this connection portion, and by applying a certain force or more, the grip portions 3a, 3a rotate around the set bolt 36 and the fourth
As shown by the chain line in the figure, the protruding direction from the sliding machine frame 34 can be freely changed. The handle rod 3 is attached to the attachment seat 30 at the lower end of the attachment machine frame 31.
Is assembled to the machine body a by assembling it to a portion of the drive mechanism section 1 which also serves as the main machine frame, which is close to the front end side.

The shoulder strap 4 is a buckle 4 which is a band 40 having a predetermined length.
1 is connected in a loop shape whose diameter expands and contracts, and a hook-shaped connecting metal fitting 42 is fitted and mounted on the lower end side in the middle so as to freely slide in the longitudinal direction. Although it is the same as the shoulder strap 4 of the conventional means, the vertical length of the shoulder strap 4 when the worker M hangs it on the neck as shown in FIG. 3 is shorter than that of the shoulder strap 4 of the conventional means. In this state, the connecting metal fitting 42 located at the lower end is almost at the palm position of both hands of the operator M. The shoulder strap 4 slides on the main machine frame 33 of the handle rod 3 provided on the machine body a when the connecting metal piece 42 located at the lower end thereof is connected to the machine body a of the brush cutter A. Sliding machine frame 34 freely fitted
An engagement fitting 43 is provided at a rear end portion of the main body frame 33 by engaging the connection fitting 42 with the engagement fitting 43, and the engagement fitting 43 is connected to the sliding machine frame 34 side that moves in and out of the main machine frame 33 to expand and contract. I am trying to connect to a.

The embodiment apparatus configured as described above operates as follows.

As shown in FIG. 3, an operator M puts a shoulder strap 4 on his / her neck to support the weight of the machine body a, and the left and right hand grips 3a, 3a at the tip of a handle rod 3 provided on the machine body a are held by the palms of both hands. A state in which the height H of the slope n is high and the tip of the cutting blade mechanism 2 does not reach the lower end of the slope n when gripping and performing grass cutting work on the slope n of the ridge K. In order to cope with this, when adjusting the machine body a so as to lower it with respect to the worker M, the operation lever 352 is tilted to the front, the tightening is loosened, the sliding machine frame 34 is pulled out from the main machine frame 33, and the handle rod 3 is pulled out. Make it longer. Then, when the body a descends due to the extension of the handle rod 3 and the tip of the cutting blade mechanism 2 reaches the lower end of the slope n, the operating lever 352 is pushed forward to rotate upright for adjustment. Fix it to the specified length.

As a result, a predetermined work can be performed by holding the left and right grips 3a, 3a with both hands and operating the machine body a.

At this time, the connecting metal fitting 42 of the shoulder strap 4 and the handle rod 3
The position of connection with the engaging fitting 43 provided at does not move.

Therefore, if the length of the shoulder strap 4 is adjusted so that the position of the connecting metal fitting 42 occupies the position of the palm of both hands of the worker M in a state of being hung on the neck, the shoulder strap 4 is hung on the shoulder strap 4. The brush cutter A, which is supported by being lowered, holds the handle rod 3 in a state where the left and right grips 3a, 3a of the handle rod 3 provided on the body a of the brush cutter A are held at positions where the operator holds them with both hands.
The vertical adjustment of the machine body a can be freely performed by adjusting the length of the shoulder strap 4 without adjusting the length of the shoulder strap 4.
The vertical movement of the machine body a can be adjusted only by adjusting the length of the handle rod 3.

As described above, the shoulder-mounted portable brush cutter according to the present invention has the body a including the blade mechanism 2 and the drive mechanism 1,
The engine E and the handle bar 3 which expands and contracts are assembled, and the connecting metal fitting 42 of the shoulder strap 4 is connected to the sliding machine frame 34 side of the handle bar 3 which expands and contracts. The height of the handle rod 3 is adjusted only by adjusting the length of the handle rod 3 when the operator grips the grip portions 3a of the handle rod 3 and the supporting height of the machine body a for the worker M is adjusted. The band 4 can be easily and quickly performed without adjusting the length of the band 4 and the length of the shoulder strap 4.

[Brief description of drawings]

FIG. 1 is an explanatory view of the conventional means, FIG. 2 is a side view of a shoulder-mounted portable brush cutter according to the present invention, FIG. 3 is a perspective view of the same usage state as above, and FIG. Fig. 5 is an exploded perspective view, and Fig. 5 is a vertical side view of the same portion. Explanation of the drawing symbols A ... brush cutter, E ... engine H ... height, K ... ridge M ... worker, a ... machine n ... slope, 1 ... drive mechanism 2 ... Cutting blade mechanism, 20 ... Fixed blade 21, Moving blade, 22 ... Guide part 3 ... Handle rod, 3a ... Grip part 30 ... Mounting seat, 31 ... Mounting machine frame 32 ... Connecting shaft, 33 ...... Main machine frame 34 …… Sliding machine frame, 35 …… Tightening tool 36 …… Set bolt, 37 …… Tightening nut 350 …… Spindle, 351 …… Eccentric cam 352 …… Operating lever 353 …… Crimping plate 4 ... Shoulder strap, 40 ... Band 41 ... Buckle, 42 ... Connecting fitting 43 ... Engaging fitting

Claims (1)

[Scope of utility model registration request] 1. An engine E and a handle rod 3 which expands and contracts are attached to a machine body a composed of a cutting blade mechanism 2 and a drive mechanism section 1,
A portable brush cutter for shoulder mounting, in which the connecting metal fitting 42 of the shoulder strap 4 is connected to the sliding machine frame 34 side of the handle rod 3 which is extended and contracted.