JPH023721Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to a rotation locking device for the main operating rod in a brush cutter, and more specifically, the main operating rod is rotatably supported on a clutch housing installed in the engine, so that the main operating rod can be rotated during non-operation. This invention relates to a rotation locking device for regulating rotation.

[Conventional technology]

In conventionally widely used brush cutters, one end of the main operating rod is rotatably inserted into and supported by a clutch housing that is integrally attached to the engine. The hanging fittings are fixed with bolts. Both the clutch housing and the main operating lever have circular sliding surfaces, and since the handle that the operator holds is attached to the operating main lever, the brush cutter can be swung from side to side during brush cutting work, and
Since torsion is applied to the main operating lever, there is a possibility that the main operating lever may rotate relative to the clutch housing on the engine side.

[Problem that the invention attempts to solve]

In the above-mentioned brush cutter, the main operating rod is rotatably fitted into the clutch housing, which is fixed to the engine. A locking mechanism is required to prevent rotation. Therefore, one of the proposals was
Examples include those shown in Japanese Patent No. 51-27147. That is, in the prior art, the main operating lever and the hanging fitting are connected by a connecting member, and the clutch housing and the main operating lever are rigidly connected to each other in the direction of rotation. Although it is possible to prevent rotation between the operating lever and the clutch housing, the connecting member is located outside the clutch housing, which not only spoils the appearance but also increases the weight, increasing the burden on the operator, and furthermore, it may cause stress on the operator during work. There are problems such as it may hit the patient's waist area.

[Means to solve the problem]

Therefore, in order to solve the above-mentioned problems, this invention forms an insertion space for inserting the operating main rod along the axis of the clutch housing, and
An irregularly shaped space is provided at the open end, a fitting block is formed as an irregularly shaped flange portion of a fastening bush that can be fitted into this irregularly shaped space, and a fastening flange is formed adjacent to this fitting block. It is characterized in that it is integrated with the main operating lever by tightening continuous cylindrical parts, and is constructed so that it can resist the clutch housing in the direction of rotation by means of a fitting block.

【Example】

Next, Figure 1 shows an embodiment of this invention.
FIG. 6 will be explained in detail. In these figures, reference numeral 10 indicates the main operating rod of the brush cutter, and a transmission shaft 11 for transmitting power to the cutting blade is passed along the axis of the main operating rod 10, and the shaft on the engine side is connected to the main operating rod 10. A spline 11A is formed at the end and is attached to the spline hole 12A of the boss shaft provided in the centrifugal clutch drum 12.
and the clutch housing 20 via a bearing 13 supported by the clutch housing 20, which will be described later.
It is rotatably supported on the shaft. The end of the main operating rod 10 is rotatably and securely fitted into a clutch housing 20 fixed to the engine. This clutch housing 20 has a conical clutch accommodating portion 2.
1 and a cylindrical cylinder part 22,
The bearing 13 is supported by a bearing support 23 in the clutch housing 21. Further, the cylinder portion 22 has a fitting portion 24 for the main operating rod 10 and an insertion space 25 extending to the open end side thereof, and the open end of the insertion space 25 has an irregularly shaped space partially enlarged in the radial direction. It has A thick flange 26 extending in the radial direction is formed at the end of the clutch housing 20 including the irregularly shaped space 25A, and two window holes 26A are formed in the flange 26. An end portion 31 of a hanging metal fitting 30, which is a locking metal fitting for a shoulder band of a brush cutter, is fixed to this flange 26 by two bolts 32, and a plurality of locking holes 34 are bored in the other end portion 33. Furthermore, a space 2 including an irregularly shaped space 25A formed on the open end side of the clutch housing 20
A fastening bushing 40 made of an elastic material, for example plastic, is fitted into the fastening bushing 5. This fastening bush 40 has a cylindrical shape with a size that allows it to be fitted into the space 25, and a fitting space 41 in the center of which the main operating rod 10 is rotatably fitted with a small gap. is formed by the cylindrical portion 41A, and the irregularly shaped space 25A is formed in a part of the cylindrical portion 41A.
An irregularly shaped flange portion 42 is formed to fit therein. This irregularly shaped flange portion 42 is connected to the fastening bush 40.
The fitting block 42A is formed by a slit 43 cut in a plane perpendicular to the axis up to about the upper half of the cylindrical part.
and a fastening flange 42B, and the fastening flange 42B is formed as a pair of flanges by a slit 44 made parallel to the axis of the fastening bush 40. The fastening flange 42B has a bolt hole 45 having a common axis with the bolt hole 25B drilled in the irregularly shaped space 25A of the clutch housing 20.
A bolt 46 passing through these holes 25B and 45 is tightened with a wing nut 47 to narrow the gap between the slits 44 of the fastening flange 42B and reduce the diameter of the cylindrical portion 41A continuous to the fastening flange 42B. It is becoming larger in diameter. Said fitting block 42
A locking flange 48 having a diameter corresponding to the end surface of the clutch housing 20 is formed on the open end surface of A, and the fastening bush 40 is attached to the clutch housing 20.
It prevents it from falling inside. Therefore, the fastening bush 40 is fitted into the space 25 of the clutch housing 20, and the irregularly shaped flange portion 42 fitted into the irregularly shaped space 25A.
The fitting block 42A is fitted into the space, thereby suppressing deviation in the rotational direction between the clutch housing 20 and the fastening bush 40 penetrating through the space 25. In addition, by tightening the fastening flange 42B with bolts 46 and wing nuts 47, the diameter of the cylindrical portion 41A connected to the fastening flange 42B is reduced, thereby tightening and fixing it to the operating main rod 10, The operating main lever 10 is integrated with the clutch housing 20 also in the rotational direction.

[Effect of the idea]

As is clear from the above description, the locking device for locking the main operating rod in the brush cutter of this invention has the following effects. (a) An irregularly shaped space is formed in the space of the clutch housing into which the fastening bush is fitted, and an irregularly shaped flange that fits into this irregular space is formed on a part of the circumferential surface of the fastening bush, so that the clutch housing The main components of the locking mechanism are housed inside, allowing it to be compact and stylish. (b) Since the irregularly shaped flange part is divided into a fitting block and a fastening flange by a slit made along the direction perpendicular to the axis, the cylindrical part connected to the fastening flange is fastened to the operating main rod. fixed,
In addition, the fitting block functioned to prevent the fastening bush from rotating relative to the clutch housing, and the pair of fastening flanges were narrowed by the irregularly shaped space, creating a gap between the fastening flanges and the irregularly shaped space in the direction of rotation. However, it actively functions as a stopper. (c) The fastening flange is separated from the fitting block and formed into a pair of opposing flanges by a slit made along its axis, so it can be fastened with a bolt inserted from the outside of the clutch housing. The cylindrical portion connected to the fastening flange is closely fixed to the outer periphery of the main operating lever, which has the effect of reliably integrating the clutch housing with the operating main lever.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of this invention, in which Fig. 1 is a longitudinal side view of a rotation locking device for a main operating rod in a brush cutter, Fig. 2 is a sectional view taken along the line of Fig. 1;
3 is a sectional view taken along the line of FIG. 1, FIG. 4 is a side sectional view of the open end of the clutch housing, and FIG.
The figure is a partially cutaway plan view of the fastening bush, and FIG. 6 is a longitudinal sectional side view of the same. 10...Operating main rod, 11...Transmission shaft, 12...
Centrifugal clutch drum, 20... Clutch housing, 21... Clutch housing section, 22... Cylinder section, 23... Bearing support section, 24... Fitting section, 25
... Insertion space, 25A ... Irregular space, 25 ... Flange, 30 ... Hanging fitting, 31, 33 ... End part,
32...Bolt, 40...Tightening bush, 41...
...Fitting space, 41A... Cylindrical part, 42... Irregular flange part, 42A... Fitting block, 42B...
Fastening flange, 43, 44...slit, 45...
... Bolt hole, 46 ... Bolt, 47 ... Wing nut, 48 ... Locking flange.

Claims (1)

[Scope of utility model registration request] The main operating lever has an engine at one end and a cutting blade at the other end, and is located at the end of the main operating lever closer to the engine.
In a brush cutter configured by supporting a main operating rod rotatably in the rotational direction on a clutch housing fixed to the engine, the clutch housing has a clutch housing through which the end of the operating main rod is inserted and supported, and a shaft of the clutch housing. The clutch housing includes a fastening bush that is inserted and fitted into a space formed along the center, and the clutch housing has an insertion space through which the operating main rod is inserted, and an irregularly shaped space formed inside the open end side thereof. The fastening bush is independent by a fitting block projecting in the radial direction from a part of the circumferential surface, and a slit extending along the circumferential direction from the fitting block,
It has a deformed flange portion formed by a pair of fastening flanges facing each other through a slit along the axis, and the deformed flange portion of the fastening bush fits into the deformed space of the clutch housing. A rotating fixing device for a main operating rod, characterized in that the cylindrical portion connected to the fastening flange is fastened to the main operating rod by a tightening bolt screwed in from the outside.