JPS6245546Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a brush cutter in which a support body rotatably supporting a rotary blade below and an engine are connected by a connecting pipe, and there is grass between the rotary blade and the support body. This relates to a cover of a brush cutter that is provided to cover the center of the upper surface of the rotary blade in order to prevent the brush cutter from getting wrapped around the rotary blade.

In general, in brush cutters, there is a risk that grass cut during mowing work may become wrapped around the rotating shaft of the rotary blade or become entangled between the rotary blade and the support and impede rotation. For this reason, a cover was conventionally provided to cover this part, but the structure for fixing this cover to the support was complicated, and the installation and
The removal work was troublesome. Alternatively, fasteners such as bolts may protrude from the outer surface of the cover and become entangled with grass, which may impede smooth operation.

The present invention provides a notch cut out in the radial direction along the axis of the support in the center of a cover that covers the center of the upper surface of the rotary blade and has a conical surface on the outer periphery.
The screws that cross this notch tighten between the tightening surfaces provided in the cover on both sides of the notch to tighten and secure the cover to the support, and also connect the screws on both end surfaces of the cover to the support. By providing holes for tightening that open at positions facing each other, and installing the screws inward from the surface of the cover in these holes, it is easy to attach and detach, and the structure is simple, and grass etc. cannot get tangled. It is an object of the present invention to provide a cover for a brush cutter that can maintain smooth operation without fear.

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

In the figure, reference numeral 1 indicates a brush cutter, in which a support 5 that rotatably supports a rotary blade 3 and an engine 7 are connected by a connecting pipe 9. Reference numeral 11 denotes a grip portion that fits into the connecting tube 9, and numeral 13 denotes a grip portion that fits into the end of the handle 15 that is fixed to the connecting tube 9. 1
Reference numeral 7 designates a throttle lever provided close to the grip portion 11, and reference numeral 19 designates a throttle wire that connects the throttle lever 17 and a throttle device (not shown) of the carburetor 21. A cover 23 covers the center of the upper surface of the rotary blade 3. 25 is 1 inside the connecting pipe 9.
A transmission shaft whose end is pivotally supported by the support body 5 through a bearing 27, and a bevel gear 29 is provided at the end.
The other end is connected to the engine 7. Reference numeral 31 denotes a rotating shaft supported by bearings 33, 33 on the support body 5, a bevel gear 35 provided at the upper end engages with the bevel gear 29, and a spline portion 37 provided at the lower end has an upper washer 39 and a lower part. The washer 41 is fitted and the rotary blade 3 is clamped. 43 is a cover plate that covers the lower end surface of the support body 5, and 45 is a protector provided at the center of the lower surface of the rotary blade 3. The cover plate 43, the upper washer 39, the lower washer 41, and the protector 45 are connected to the rotating shaft 3.
A collar 49 is attached by a nut 47 screwed onto the lower end of
It is tightened to the inner race of the bearing 33 via the inner race of the bearing 33, and is fixed to the rotating shaft 31 and rotates. 51 is a collar, and 53 is an oil seal. cover 23
is fitted into the lower end of the support body 5 in the center fitting hole 55 and is provided to cover the central upper surface of the rotary blade 3. 57 is a notch provided in the center of the cover 23, which has a conical surface on the outer periphery, along the axis of the support body 5 in the radial direction, and 59 is a notch provided across the notch 57, such as a bolt, etc. It is provided by being recessed inward from the surface of the cover 23 with a screw. Reference numeral 61 indicates a tightening surface provided inside the cover 23 on both sides of the notch 57, and reference numeral 63 indicates a tightening hole opening in the cover 23 at a position facing both end surfaces of the screw 59.

In the above embodiments, the operator holds the grip portion 11,
13 and drive the transmission shaft 2 by the engine 7.
5. Grass and the like are mowed by the rotary blade 3 which is rotatably driven through the bevel gears 29, 35 and the rotary shaft 31. Grass or the like that tends to get caught between the support body 5 and the rotary blade 3 moves along the conical surface of the cover 23 to the outer periphery of the support body 5 and separates from the rotary blade 3, so that it does not obstruct rotation. do not have. This cover 23
can be easily attached and detached from the support 5 using screws 59, and since the screws 59 are recessed into the inside from the surface of the cover 23 and do not protrude from the surface, there is no chance of grass etc. getting tangled with the support 5. 5, and can maintain smooth rotation.

Since the present invention has the structure as claimed, the structure is simple and easy to attach and detach, and since there is nothing protruding from the cover surface, grass etc. do not get tangled, and rotation can be maintained smoothly. It is something.

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 cover according to the present invention, Fig. 2 is a side sectional view of one embodiment of the present invention, and Figs. 3 and 4 are front sectional views of the same essential parts, respectively. , is a plan view. Explanation of the symbols representing the main parts of the drawing, 3...
Rotating blade, 5... Support, 7... Engine, 9...
Connecting pipe, 23...Cover, 57...Notch, 59
...Screw, 61...Tightening surface, 63...Hole.

Claims (1)

[Scope of utility model registration request] A support body 5 that rotatably supports the rotary blade 3 downwardly.
In a brush cutter in which a cover 23 and an engine 7 are connected to each other by a connecting pipe 9, the shaft of the support 5 is attached to the center of a cover 23 that covers the center of the upper surface of the rotary blade 3 and has a conical surface on the outer periphery. A notch 57 cut out in the radial direction along the core wire is provided, and a screw 59 crossing the notch 57 is used to tighten the tightening surfaces 61 and 6 provided in the cover 23 on both sides of the notch 57, respectively.
1, the cover 23 is tightened and fixed to the support body 5, and holes 63 for tightening are provided at positions facing both end surfaces of the screws 59 of the cover 23, respectively. A cover for a brush cutter, characterized in that the screw 59 is provided in the hole 63 so as to be recessed inward from the surface of the cover 23.