JPH0226264Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a brush cutter in which a support for rotatably supporting a rotary blade and an engine are connected by an outer pipe, and the outer pipe is fixed to the support or the engine. This relates to an outer pipe fixing device for a brush cutter.

Conventionally, in this type of outer pipe fixing device for a brush cutter, a notch groove is provided in the axial direction in a cylindrical support part into which the end of the outer pipe fits into the support body or the engine, and this notch groove is tightened. The outer pipe was fixed to the support part by frictional force. In this method, the outer pipe moves due to the shock applied to the rotary blade during mowing work, engine vibration, inertia force, etc., changing the posture of the rotary blade, or the outer pipe slips out and power is no longer transmitted. There was a risk that the pipe would fall off.

The present invention provides a notch groove in the cylindrical support part and a clamp that clamps the outer periphery of the support part.
By providing a locking piece that protrudes from the inner surface of the clamp and penetrates and engages the support portion and the outer pipe, the outer pipe is reliably locked to the support portion.
The purpose is to prevent the outer pipe from moving or falling off, and to perform grass cutting work safely.

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

In FIGS. 1 to 5, 1 is an outer pipe that connects the support 5 that rotatably supports the rotary blade 3 and the engine 7, 9 is a grip provided in the middle of the outer pipe 1, and 11 is the outer pipe. 1 is a grip part provided on a handle 15 fixed to the handle 1 by a fixture 13. A centrifugal clutch 17 is fixed to the crankshaft 19 of the engine 7, and when a predetermined rotational speed is reached, it comes into contact with a clutch drum 21 near the outer periphery due to centrifugal force, thereby transmitting power.
23 is a boss provided at the center of the clutch drum 21, and a clutch case 25 is fixed to the engine 7.
The transmission shaft 31 is supported via bearings 27, 27, and is supported by a spline 29 provided in the center.
is engaged with one end of the 33 is clutch case 2
One end of the outer pipe 1 is fitted into the cylindrical support part provided at the end of the outer pipe 5. 35 is a notch groove 37 cut out in the axial direction at the end of the support part 33, and 37 is a two-part clamp that fits on the outer periphery of the support part 33;
The outer pipe 1 is fixed by clamping the support portion 33 with bolts 39, 39. A pin-shaped locking piece 41 projects from the inner surface of the clamp 37, and is fitted into a hole 43 passing through the clamp 37 and welded thereto. The locking piece 41 is connected to the support portion 33 and the outer pipe 1.
locking holes 45 provided at corresponding positions,
It penetrates and locks into 47.

Reference numeral 49 denotes a cylindrical support part provided protruding from the support body 5, into which the other end of the outer pipe 1 is fitted. 5
Reference numeral 1 indicates a notch groove cut out in the axial direction at the end of the support portion 49;
The outer pipe 1 is fixed by clamping the supporting part 49 with bolts 55, 55 using a split clamp. A pin-shaped locking piece 57 projects from the inner surface of the clamp 53, and is fitted into a hole 59 passing through the clamp 53 and welded thereto. The locking piece 57 is attached to the support portion 4
9, are fitted and locked into locking holes 61 and 63 provided in corresponding positions of the outer pipe 1, respectively. 65 is a bevel gear that engages with the other end of the transmission shaft 31 via a spline 67; a bearing 69;
It is pivotally supported by the support part 49 via 69. 71
A rotating shaft is rotatably supported by a bearing 73 on the support body 5, and a bevel gear 75 that engages with a bevel gear 65 is fixed to one end, and a rotary blade 3 is fixed to the other end.

In the above embodiment, the power of the engine 7 is
From the crankshaft 19, the centrifugal clutch 17, the clutch drum 21, the transmission shaft 31, the bevel gear 65,
75. Rotate the rotary blade 3 via the rotation shaft 71. The operator holds the grips 11, 11 with both hands and uses the rotary blade 3 to cut grass, etc. on the ground. Even if an impact force is applied to the rotary blade 3 during work, the outer pipe 1 and the supporting parts 33, 4
Since the outer pipe 1 and the support portion 3 are securely locked by the locking pieces 41 and 57, the outer pipe 1 and the support portion 3
There is no movement between 3 and 49.

Since the present invention has the configuration as described in the claims, the outer pipe and the support part are reliably locked, the outer pipe is prevented from moving or falling off, and grass cutting work can be performed safely. It is something that can be done.

Note that the locking pieces 41 and 57 are clamped to the clamps 37 and 53.
The means for fixing each clamp to the clamp is not limited to welding as shown in the above embodiments, but may be fixed by other means such as press-fitting or screws, or it may be formed integrally with the clamp by casting. Good too. Further, it may be detachably attached with a screw and may also be provided to serve as a refueling plug.

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 a brush cutter equipped with a device according to the present invention, and Figs. 2 and 3 are respectively
FIGS. 4 and 5 are side sectional views and front sectional views of other embodiments. Explanation of the symbols representing the main parts of the drawing, 1...
Outer pipe, 3... rotary blade, 5... support body,
7... Engine, 33, 49... Support part, 35,
51... Notch groove, 37, 53... Clamp, 4
1,57...Locking piece.

Claims (1)

[Scope of utility model registration request] In a brush cutter in which a support 5 that rotatably supports a rotary blade 3 and an engine 7 are connected by an outer pipe 1, an end of the outer pipe 1 is connected to the support 5 or the engine 7. Notch grooves 3 are formed in the axial direction in the cylindrical support portions 33 and 49 to be fitted.
5, 51, and the supporting parts 33, 4
Clamps 37 and 53 are provided to clamp the outer periphery of 9,
An outer pipe fixing device for a brush cutter, characterized in that locking pieces 41, 57 are provided that protrude from the inner surfaces of the clamps 37, 53 and penetrate and lock the support parts 33, 49 and the outer pipe 1. .