JPH0440433Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Field of Industrial Application] The present invention relates to a cutting blade housing for a lawn mower, and particularly to a synthetic resin cutting blade housing for a rotary lawn mower.

[Conventional technology]

In this type of lawn mower, flanges 2 having an L-shaped cross section are integrally formed downward on both lower outer surfaces of the peripheral wall 1a of the synthetic resin mowing blade housing 1, and a space S between the flange 2 and the housing peripheral wall 1a. It is known that plate-shaped reinforcing ribs 3 are arranged in rows.

[Problem that the invention attempts to solve]

However, the above blade housing 1
generally includes a cylindrical bearing boss 14,
The axles of the front and rear wheels are inserted through the axles 15 and supported, and the flanges 2 are simply formed on the lower outer surfaces of both sides of the peripheral wall 1a of the cutting blade housing 1, as in the conventional case.
Even if the reinforcing rib 3 is provided between the flange 2 and the peripheral wall 1a, there is a possibility that the strength of the synthetic resin cutting blade housing 1 cannot be ensured sufficiently. Further, in the conventional housing, the reinforcing ribs 3 are provided in a substantially radial direction as shown in FIG. 5, and therefore, although the rigidity of the housing in the inner and outer directions is relatively strong, the rigidity in the circumferential direction tends to be insufficient.

The present invention aims to solve the above problems.

B. Structure of the invention [Means for solving the problems] In order to achieve the above object, the lawn mower cutting blade housing according to the invention has the following structure.

That is, flanges 2 having an L-shaped cross section are integrally formed downward on both lower outer surfaces of the peripheral wall of the synthetic resin cutting blade housing 1, and a plate-shaped reinforcing rib is provided in the space S between the flange 2 and the housing peripheral wall 1a. 3 are arranged in a row, the above-mentioned flange 2 is extended to the bearing boss parts 14, 15 of the front and rear wheels 4, 5 formed on the above-mentioned cutting blade housing 1, and the above-mentioned plate-shaped reinforcing rib 3 is provided. It is characterized in that it is formed in a zigzag shape between the flange 2 and the housing peripheral wall 1a.

[Effect]

As described above, by extending the flange 2 to the bearing boss portions 14, 15 of the front and rear wheels 4, 5, and forming the reinforcing rib 3 in a zigzag shape,
It becomes possible to increase the support strength of the cutting blade housing 1 with respect to the front and rear wheels 4 and 5, as well as the rigidity of the housing in the inner and outer directions and the circumferential direction.

〔Example〕

A detailed explanation will be given below based on the embodiment shown in the drawings.

Figure 1 is a perspective view of a rotary lawn mower to which the present invention is applied, Figure 2 is a side view of its cutting blade housing,
FIG. 3 is a bottom view thereof.

In the illustrated lawn mower, front and rear wheels 4 and 5 are supported by a cutting blade housing 1, and an engine 6 is mounted on the upper surface of the housing 1 with a crankshaft substantially perpendicular to the housing 1.
A rotary cutting blade 7 is attached to the lower end of the crankshaft within the cutting blade housing 1, and the grass cut by the cutting blade is stored in a grass bag 8 at the rear.
9 indicates a handle.

As shown in FIG. 3, the mowing blade housing 1 includes a mowing blade accommodating part 11 having a substantially circular bottom surface, and a cover 12 that covers the axle 4a of the front wheel 4 at the front part of the mowing blade accommodating part 11, and a cover 12 that covers the axle 4a of the front wheel 4 at the rear of the accommodating part 11. Guide ducts 13 leading to the grass collection bag 8 are each formed integrally. Both left and right sides 12a and 13a of the cover 12 and the duct 13
Bearing bosses 14 and 15 for the front and rear wheels 4 and 5 are integrally provided.

The flanges 2 are formed in a downward L-shape (shown in FIG. 4) on the outer surface of the lower left and right sides of the peripheral wall 1a of the cutting blade housing 1, and the ends of each flange 2 are connected to the bearing boss 14, as shown in FIG. It has been extended to 15.

Further, the reinforcing rib 3 is provided over the entire length of the flange 2, and is integrally formed in a chevron shape so that the ends of adjacent ribs 3 intersect at the side surface 2a of the flange 2 and the housing circumferential surface 1a.

C. Effect of the invention As described above, the present invention provides support for the cutting blade housing 1 with respect to the front and rear wheels 4, 5 by extending the flange 2 to the bearing boss portions 14, 15 of the front and rear wheels 4, 5. In addition to increasing the strength, forming the reinforcing ribs 3 in a zigzag shape increases the rigidity of the housing 1 in the internal and external directions and in the circumferential direction, and also ensures sufficient strength even if the cutting blade housing is made of synthetic resin. This has the advantage of being able to provide a highly durable cutting blade housing.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a rotary lawn mower to which the present invention is applied, Figure 2 is a side view of its cutting blade housing,
FIG. 3 is a bottom view thereof, FIG. 4 is a sectional view taken along the line of FIG. 2, and FIG. 5 is a bottom view of the conventional cutting blade housing. 1 is a cutting blade housing, 1a is a peripheral wall, 2 is a flange, 3 is a reinforcing rib, and S is a space.

Claims (1)

[Scope of utility model registration request] Flanges having an L-shaped cross section are integrally formed downward on both lower outer surfaces of the peripheral wall of the synthetic resin cutting blade housing, and plate-shaped reinforcing ribs are arranged in a row in the space between the flanges and the housing peripheral wall, The flange is provided to extend to the front and rear wheel bearing boss portions formed on the cutting blade housing, and
A cutting blade housing for a lawn mower, characterized in that the plate-shaped reinforcing rib described above is formed in a zigzag shape between the flange and the housing peripheral wall.