JPH0219010Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention particularly relates to a mounting structure for an adjuster base panel in a walk-behind lawn mower.

(Prior art) Whether a walk-behind lawn mower is a hand-pushed type or a powered type, the mowing height is adjusted by changing the positional relationship of the front and rear wheels with respect to the main body and changing the height of the main body, that is, the cutter blade, relative to the ground. Can be adjusted.
In this case, an adjustment base panel is usually provided on the cutter housing, and the cutting height is adjusted by operating an adjustment lever. Incidentally, the base panel has a mounting structure that receives a force caused by a rotational moment received from an adjustment lever about a center bolt serving as a pivot point. Therefore, a mounting structure has been proposed in which a protrusion is protruded from the housing and a base panel is fitted into the protrusion.

(Problems to be solved by the invention) According to the conventional mounting structure, a flange was not formed in the hole to fit into the projection on the adjusting base panel side, so the surface pressure was high and the projection formed on the housing was damaged and rattled. Especially when the housing is made of synthetic resin, such problems must be given even more importance.

(Means for Solving the Problems) According to the present invention, an annular raised wall portion is formed in the fitting hole in the adjusting base panel.

(Function) According to the above structure, the contact area between the protrusion protruding from the cutter housing and the hole formed in the adjuster base panel becomes large, thereby making it possible to reduce the surface pressure.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the appearance of a walk-behind power lawn mower 1. As shown in FIG. Left and right front wheels 3, 3 and rear wheels 4, 4 are attached to the four corners of the cutter housing 2 molded from synthetic resin.
The engine 5 is provided in the center of the housing 2, and the engine 5 is covered with an engine cover 6. Handles 7 extend upwardly from the rear left and right sides of the housing 2, and a grass bag 8 for storing cut grass is attached to the rear of the housing 2.

In the above, the rear wheels 4, 4 of the lawn mower 1 are configured to receive driving power from the engine 5. Further, the front wheels 3 and the rear wheels 4 have a configuration in which their relative positions with respect to the housing 2 can be changed so that the mowing height of the lawn in the lawn mower 1 can be adjusted. The lever 9 shown in FIG. 1 is an adjustment lever for adjusting the mowing height. For example, when the adjustment lever 9 on the rear wheels 4 is set to the upper position, the mowing height becomes lower, and when it is set to the lower position, the mowing height becomes higher. Next, a mowing height adjustment mechanism for the rear wheels 4 will be explained based on FIGS. 2 and 3.

In FIGS. 2 and 3, 2a is a rear side wall of a housing 2 made of synthetic resin, and 4 is a rear wheel. The rear wheel 4 is rotatably attached at its center to a support rod 11 erected on an adjuster arm 10. 12 is a bolt for mounting. The adjuster arm 10 has one end pivotally connected to the housing 2 by a center bolt 13, and has a U-shaped portion 10a and the adjuster lever 9 inserted through the other side of the vertical cross-sectional shape in FIG. It has an opening.

The adjustment lever 9 is made of a metal plate having the required elasticity and rigidity and is formed into the shape shown in the figure. One end is pivotally connected to the housing 2 by the center bolt 13, and the other end has a grip portion 9a, and the bent portion has a protrusion that engages with the tip 10b of the adjuster arm 10. It is formed by forming a piece 9b. In the above, when the adjustment lever 9 is pressed in the direction A and swung as shown in B, the adjustment arm 10 rotates together with the adjustment lever 9.

On the other hand, the adjustment lever 9 is connected to an adjustment base panel 14 fixed to the side wall 2a of the housing.
The position is regulated and maintained in a fixed state. The base panel 14 has a fan-like shape as shown in FIG. 3, and its base 14a is fixed to the side wall 2a by the large-diameter portion 13a of the center bolt 13.
Further, the base panel 14 is bent to follow the external shape of the side wall 2a, and an upstanding piece 14b is formed on the circumference of the base panel 14.
and a large number of grooves 15 in this upright piece 14b.
...is established. The adjustment lever 9 is engaged with the grooves 15, and thereby the adjustment lever 9 can be freely positioned. Further, a hole 14d having an annular raised wall portion 14c is bored near the center of the base panel 14, and this hole 14d is fitted into a dowel 16 formed at a corresponding location on the side wall 2a of the housing 2. and base panel 1
Rivets 17 are arranged at multiple locations near the peripheral edge of the base panel 14, and the peripheral edge of the base panel 14 is connected to the housing 2.
It is fixed to the side wall 2a of.

In the above, the relatively large diameter hole 14d drilled in the base panel 14 fits into the dowel 16 protruding from the housing 2, and the raised wall part 14c is in contact with the outer peripheral surface of the dowel 16. Overall, the surface pressure is decreasing.

Note that the center bolt 13 is inserted into a hole 2b formed in the housing 2 via a collar 18,
At the tip, there is a nut 20 through a washer 19.
is screwed on.

According to the above structure, when the adjustment lever 9 is fitted into the groove 15 at a predetermined position and is in the C state, for example, the mowing height is set to a height corresponding to the groove 15. When changing the mowing height, press the adjuster lever 9 in the direction A to release the engagement with the groove 15, then rotate it downward in the direction B to adjust the height as desired within the preset height range. Select the height of groove 1 again.
5 to set the mowing height.

When the adjuster lever 9 is set, the base panel 14 receives a rotational moment caused by the adjuster lever 9, but the base panel 14 and the housing 2 are fitted with the raised wall portion 14c and the dowel 16. Therefore, the housing side is not damaged, and the mounting strength of the base panel 14 as a whole can be increased.

(Effect of the invention) As is clear from the above explanation, according to the invention,
The adjuster base panel, which holds the position of the adjuster lever that can adjust the cutting height, is attached by engaging a dowel protruding from the housing with a hole with an annular raised wall formed in the adjuster base panel. No shearing force is applied to the rivets, improving the mounting strength of the adjustable base panel. This is an optimal mounting structure especially for those whose cutter housing is made of synthetic resin.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a lawn mower according to the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a view taken along the direction arrow in FIG. In the drawing, 1 is a lawn mower, 2 is a cutter housing,
3 is a front wheel, 4 is a rear wheel, 5 is an engine, 9 is an adjustment lever, 10 is an adjustment arm, 13 is a center bolt, 14 is an adjustment base panel,
16 is a dowel, 14c is an annular upright piece, 14d is a hole,
17 is a rivet.

Claims (1)

[Scope of utility model registration request] In a lawn mower having a cutter housing made of synthetic resin, a hole having an annular raised wall portion is formed in a base panel for cutting height adjustment whose one end is fixed to the cutter housing, and this hole is provided in the cutter housing. A mounting structure for an adjuster base panel of a lawn mower, characterized in that it is fitted into a dowel and fixed to a cutter housing by a fixing means.