JPS6320274Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a lawn mower housing.

Conventionally, lawn mowers are known that include a rotary lawn mowing blade and a housing that covers the blade from above, and the blade is rotationally driven by an engine mounted on the upper surface of the housing, for example.
The housing generally has a peripheral wall a formed in an upright shape, as shown in FIG. 1, for example.
In this case, the gap l between the blade b and the peripheral wall a must be relatively narrow in terms of grass suction performance. This is accompanied by the inconvenience of the winds colliding violently and making a lot of noise.

The object of the present invention is to provide a housing that is provided with a recessed space outside the blade's rotation locus to allow wind from the blade to escape in the circumferential direction, thereby reducing noise without degrading grass suction performance. This is a lawn mower housing that covers a rotary lawn mowing blade from above, the housing having a circumferentially recessed portion extending in the circumferential direction that is recessed outward in the peripheral wall portion of the housing body on the outside of the rotation locus of the blade. .

Next, the present invention will be explained with reference to the embodiment shown in FIGS. 2 and 3.

In the drawings, reference numeral 1 indicates a housing body that covers a rotary lawn mowing blade 2. The housing body 1 is made of, for example, a press molded product of SP material, and an engine mount part 3 is provided at the center of the upper surface of the housing body 1. 3
The blade 2 is configured to be rotationally driven by an engine 4 installed in the main body 1, and the grass cut by the blade 2 is connected to a grass blowing part 5 integral with the main body 1 and extending diagonally rearward and upward. It is arranged to be housed in a bag 7 at the rear of the bag 7 via an air guide passage section 6 inside.

In the drawing, reference numeral 8 indicates front and rear wheels provided on the housing body 1, and the rear wheel 8 is connected to the engine 4 via a transmission mechanism (not shown) to configure the lawn mower to be self-propelled.

Although the above is not particularly different from the conventional one, according to the present invention, the peripheral wall portion of the housing main body 1 on the outside of the rotation locus of the blade 2, that is, the third
As shown in the figure, a recess 9 extending in the circumferential direction is formed at the periphery of the opening at the bottom of the main body 1.

When the main body 1 is a press-molded product, the recess 9
is formed by bulge processing, which is advantageous because the recess 9 contributes to increasing the rigidity of the main body 1 and allows the main body 1 to be made thinner to reduce the weight of the lawn mower.

Next, to explain its operation, when the blade 2 rotates, the wind blown outward from the blade 2 escapes in the circumferential direction within the recessed space outside the rotation locus, which is formed by the recess 9 formed in the housing body 1. The direct impact of the wind on the main body 1 is suppressed as much as possible, and the noise level is reduced by about 2 to 3 dB compared to the conventional one. In terms of soundproofing technology, a reduction of 2 to 3 dB is a very significant effect.

In addition, the wind from the air guiding passage 6 in the main body 1 can be prevented from being drawn into the recess 9 by keeping the gap l between the upper edge of the recess 9 and the blade 2 to the same extent as in the conventional case. Since it is narrowed, it is prevented as much as possible, and the suction performance of the grass does not deteriorate.

As described above, according to the present invention, the recess 9 extending in the circumferential direction and recessed outward is formed in the peripheral wall portion of the housing body 1 outside the rotation locus of the blade 2, without deteriorating the grass suction performance. In addition, when the main body 1 is a press-molded product, the recess 9 serves to reinforce the main body 1, and has the effect of making the main body 1 thinner and reducing the weight of the lawn mower.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional example, FIG. 2 is a perspective view of a lawn mower using the housing of the present invention, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. 1...Housing body, 2...Blade, 9...
...concavity.

Claims (1)

[Scope of utility model registration request] A lawn mower housing that covers a rotary lawn mower blade from above, the lawn mower housing comprising an outwardly extending recess extending in the circumferential direction in a peripheral wall portion of the housing body on the outside of the rotation locus of the blade.