JPS6332598Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a support body that rotatably supports a rotary blade and a clutch housing of the engine, which are connected by an outer pipe, and the outer pipe is rotatably supported by the clutch housing. This is related to the brush cutter.

Generally, when performing grass cutting work on sloped land, etc., the work can be made easier by rotating the rotary blade to a position that matches the ground surface without changing the position of the engine or the like. For this reason, the outer pipe is rotatably supported by the clutch housing,
Work is carried out by holding the rotary blade together with the outer pipe in an appropriately rotated position by operating a handle held by the operator. Conventionally, in this type of brush cutter, as shown in Fig. 12, a snap spring is engaged with the outer periphery of the tip of an outer pipe that rotatably fits into the clutch housing.
Movement in the axial direction was restricted by this snap spring. For this reason, when assembling, it is necessary to attach the snap spring from inside the clutch housing, making the assembly process cumbersome.Also, since the engagement groove for the snap spring is machined in the thin-walled outer pipe, this part is difficult to assemble. became even thinner and there was a risk of damage.

This invention restricts the axial movement of the engaging body, which fits around the outer pipe and is tightened and fixed with a screw near the outer end of the clutch housing, relative to the clutch housing near the outer end of the clutch housing. By providing
It is easy to assemble, and there is no need to create a snap spring groove on the outer periphery of the outer pipe.
It is an object of the present invention to provide a brush cutter that can reduce the weight of an outer pipe without reducing the strength of the outer pipe.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

1 to 4, 1 is an outer pipe whose one end is fixed to a support 5 that rotatably supports a rotary blade 3, and whose other end is rotatably fitted into a clutch housing 9 of an engine 7. There is. Reference numerals 11 and 11 indicate grip portions provided on the handle 13 that is fixed to the outer pipe 1. Reference numeral 15 denotes a suspension portion fixedly provided to the clutch housing 9, and is used to suspend the body by engaging a shoulder strap (not shown). 1
A centrifugal clutch 7 is fixed to the crankshaft 19 of the engine 7, and is pressed and connected to a clutch drum 21 provided close to the outer periphery by centrifugal force. Reference numeral 23 designates a boss portion of the clutch drum 21, which is pivotally supported by the clutch housing 79 through a bearing 25 and engaged with the transmission shaft 29 through a spline 27. The transmission shaft 29 passes through the inside of the outer pipe 1 and is interlocked with the rotary blade 3.

Reference numeral 31 denotes an engaging body that fits on the outer circumference of the outer pipe 1, and is tightened and fixed to 1 near the outer end of the clutch housing 9 by a screw 35 passing through a notch groove 33 cut out in the axial direction at one end. ing. Reference numeral 37 denotes a flange provided at the other end of the engaging body 31, which is rotatably fitted into the fitting hole 39 provided at the outer end of the clutch housing 9, and is fitted into the stepped portion 41 in the fitting hole 39. Snap spring 4 that engages with matching hole 39
3, the movement in the axial direction is restricted. 4
Reference numeral 5 designates a bracket integrally provided on the upper part of the clutch housing 9, to which the suspension portion 15 is fixed by bolts 47, 47. 49 is an oil seal.

In the above embodiment, when the engine 7 is driven, the power is transmitted to the centrifugal clutch 17 and the clutch drum 2.
1. It is transmitted to the rotary blade 3 via the transmission shaft 29. The operator hangs the shoulder strap (not shown) over his shoulder, suspends the machine, grasps the grips 11, 11 with both hands, and uses the rotating rotary blade 3 to cut grass, etc. on the ground. It is. When the outer pipe 1 is rotated by the handle 13 while adjusting the attitude of the rotary blade 3 to the slope of the ground surface, the outer pipe 1 rotates within the clutch housing 9 and is supported at a free rotation angle. It is something that can be done.

Since the present invention has the configuration as described in the claims, assembly and disassembly work is easy, and the strength of the outer pipe is not reduced, so it is possible to reduce the weight by reducing the wall thickness. It is possible.

In addition, FIG. 5 shows a second embodiment, in which two cutout grooves 33 at the end of the engaging body 31 are provided facing each other, and two halves of tightening rings 51, 51 are fitted on the outer periphery. It is tightened and fixed with two screws 35, 35. FIG. 6 shows a third embodiment, in which a lid 53 that locks the collar 37 is attached to the clutch housing 9 by a screw 55 instead of the snap spring 43 in the second embodiment shown in FIG. It is fixed to the end. FIG. 7 shows a fourth embodiment, in which the engaging body 31, the tightening ring 51, and the lid body 53 in the third embodiment of FIG. 6 are integrally formed to form the engaging body 31, and the axis It is divided in a plane that includes a line. FIG. 8 and FIG. 9 show a fifth embodiment, in which an engaging portion including a groove portion 56 that covers and engages the flange portion 37 at the end of the clutch housing 9 includes an axial center line. Divided into two parts on a plane, one engaging part 57 is formed integrally with the main body part of the clutch housing 9, and the other lid part 59 is formed with screws 61, 6.
1, which is removably engaged with the engaging body 3.
1 is the same as the third embodiment shown in FIG. 10th
11 shows a sixth embodiment, in which the engaging body 31 is divided into two parts along a plane including the axial center line, and the screw 3 is divided into two parts.
5 and 35, and this engaging body 31 is fitted into the fitting hole 39 of the clutch housing 9 and locked by a snap ring 43.

FIG. 12 shows the main parts of the conventional structure, in which a snap spring 63 engages with the outer periphery of the tip of the outer pipe 1, and a bearing hole 65 into which the bearing 5 is fitted.
It is locked to a washer 67 fitted into the end of the holder. The end face of the outer pipe 1 is engaged via a washer 69 with snap rings 71, 71 which engage the outer race of the bearing 25.
73 is a locking body fixed to the outer pipe 1;
It is engaged with the clutch housing 9 to restrict the rotation range of the outer pipe 1.

Note that in FIGS. 5 to 12, the same reference numerals as those shown in FIGS. 1 to 4 represent the same components.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of one embodiment of the present invention;
Figures 3 and 3 are exploded perspective views of the same essential parts, respectively.
4 is a side sectional view taken along the - line in FIG. 3, and FIGS. 5, 6, and 7 are side sectional views of main parts of the second, third, and fourth embodiments, respectively. , FIG. 8, and FIG. 9 are side sectional views of main parts of the fifth embodiment, respectively.
A plan sectional view, FIG. 10 is a side sectional view of the sixth embodiment,
Figure 11 is a front cross-sectional view taken along the line XI-XI in Figure 10.
FIG. 2 is a side sectional view of the main parts of a conventional brush cutter. Explanation of the symbols representing the main parts of the drawing, 1...
Outer pipe, 3... rotary blade, 5... support body,
7...Engine, 9...Clutch housing, 3
1... Engaging body, 35... Screw.

Claims (1)

[Scope of utility model registration request] In a brush cutter in which a support body 5 that rotatably supports a rotary blade 3 and a clutch housing 9 of an engine 7 are connected by an outer pipe 1, the outer pipe 1 is connected to the clutch housing 9.
The engaging body 31, which is rotatably fitted into the outer pipe 1 and fixed by screws 5 in the vicinity of the outer end of the clutch housing 9, is fitted onto the outer periphery of the outer pipe 1 and fixed by screws 5 near the outer end of the clutch housing 9. Near the clutch housing 9
A brush cutter characterized by being provided with restricted movement in the axial direction.