JPH0234Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lawn mower that cuts lawn grass using a cutter unit configured by coaxially overlapping an upper blade and a lower blade each having a plurality of cutting edges on the periphery.

With this type of lawn mower, the cutting edge of the cutter unit is exposed on the underside of the lawn mower body, which is extremely dangerous, so it is necessary to cover the cutter unit with a guard etc. installed vertically on the side of the lawn mower body. be.

However, if the cutter unit is covered with a guard, etc., when mowing grass near the edge of a hedge (hereinafter referred to as edge mowing), the guard will get in the way and the edge mowing will not be possible, resulting in an uncut area. This will cause more inconvenience.

On the other hand, narrowing the distance between the guard and the cutter unit will allow for edge cutting, but the cut grass will get in the way of the guard and tend to get stuck on the bottom of the lawn mower, making it difficult to discharge the grass clippings. This results in a disadvantage that the cutting efficiency itself deteriorates significantly.

This invention was made to solve these mutually contradictory problems, and its purpose is to:
To provide a lawn mower which can easily perform edge mowing and at the same time can easily discharge the cut grass without stagnation on the lower surface of the lawn mower body.

The lawn mower of the present invention is a lawn mower that cuts lawn grass using a cutter unit configured by coaxially stacking an upper blade and a lower blade each having a plurality of cutting edges on the periphery. A protective plate covering the cutter unit is attached to the side of the main body so that it can be opened and closed, and a biasing means is provided for biasing the protective plate in the opening direction.

Hereinafter, an example of implementing the present invention will be explained using a hand-held lawn mower as shown in the drawings.

The lawn mower main body A houses and installs a drive section 1 for driving a cutter unit B therein, and
One cutter unit B and a support arm 2 for supporting the cutter unit B are provided on the lower surface,
A protection plate 3 covering the cutter unit B is attached to the side of the lawn mower body A so as to be movable in opening and closing.

The cutter unit B has an upper blade 5a fixed to the lower end of a rotary shaft 4 rotatably hanging from the lower surface of the lawn mower main body A, and a fixed shaft 6 fixed to the lower end of a fixed shaft 6 coaxially hanging non-rotatably with the rotary shaft 4. The upper blade 5a is rotated in the direction of arrow t, and the upper blade 5a is rotated in the direction of arrow t.
The cutting edge part of the blade and the cutting edge part of the lower blade 5b are used to cut the grass by cutting it with scissors.

The protection plate 3 is formed into a substantially elongated flat plate shape, is attached along both sides of the lawn mower body A via a support shaft 7 so as to be able to open and close freely, and its lower end side 3a is bent at a substantially right angle toward the cutter unit B side. At the same time, it is formed into a gentle mountain shape so that the center portion 3'a protrudes the most. By forming the lower end side 3a of the protection plate 3 in this way, the protection plate 3 can be
When the cutter unit B closes, it becomes easier to take in the grass into the cutter unit B.

Further, the protection plate 3 is biased outward of the lawn mower body A by a torsion coil spring 8 attached to the support shaft 7, etc., so that the protection plate 3 is normally in the open state as shown in the drawing. It consists of Note that the means for biasing the protection plate 3 in the opening direction is not limited to the torsion coil spring 8, but an elastic body such as a leaf spring or a rubber plate may be used, or the protection plate 3 may be suspended in an inclined manner as shown in the figure. A weight may be provided as a biasing means to apply an unbalanced load so as to

Since the lawn mower of the present invention is constructed in this way, when mowing grass in a wide area, the protection plate 3 is opened to the outside of the lawn mower body A, and the lawn mower body A is moved as shown in FIG. Not only is there no risk of damaging the lawn mowing work of cutter unit B, whether it is moved in the direction of arrow m or in the direction of arrow n,
It becomes possible to discharge the cut grass to the outside of the lawn mower body A very well. In addition, by pressing the protection plate 3 against a hedge, wall, etc. when cutting edges, the protection plate 3 closes close to the cutter unit B as shown in the imaginary line in Fig. 2. As a result, the cutter unit B comes sufficiently close to the edge of the hedge or wall, so that edge cutting can be carried out effectively. At this time, even if one of the protection plates 3 is in the closed state, the other is in the open state, so there is no risk of hindrance to the discharge of the grass.

As described above, the present invention provides a lawn mower that cuts lawn grass using a cutter unit configured by coaxially stacking an upper blade and a lower blade each having a plurality of cutting edges on the periphery. A protective plate covering the cutter unit is attached to the side of the cutter unit so as to be able to open and close freely, and a biasing means for biasing the protective plate in the opening direction is provided, so that ordinary lawn mowing work can be performed efficiently. Of course, edge mowing can be easily performed, and the cut grass can be properly discharged without being stuck on the lower surface of the lawn mower body.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line 2--2 in FIG. 1, and FIG. 3 is a bottom view. In the figure, A...lawnmower body, B...cutter unit, 3...protection plate.

Claims (1)

[Scope of utility model registration request] In a lawn mower that cuts grass with a cutter unit that is constructed by coaxially overlapping an upper blade and a lower blade with multiple cutting edges on the periphery, the cutter unit is installed on the side of the lawn mower body. A lawnmower is provided with a protective plate that covers the cover so that it can be opened and closed, and is provided with a biasing means for biasing the protective plate in the opening direction.