JPH0614635A - Cutting blade case structure of lawn mower - Google Patents

Abstract

PURPOSE:To provide a cutting blade case structure capable of performing mulching treatment at a low production cost. CONSTITUTION:The objective cutting blade case structure is obtained by forming the front end of a ceiling wall of a cutting blade case 1 for housing three cutting blades 2 in an arranging state side by side into an upwardly bulging shape to the full right and left width and constructing the structure so as to convey cut lawn grass cut with the respective cutting blades 2 through the bulged ceiling wall (1A) to a cut lawn grass discharge port (a) on one transverse lateral side. The bulged ceiling wall (1A) is provided with V-shaped vertical walls 4 erected from two places to form a mulching treatment space corresponding to the respective cutting blades 2. Tilted plates 5 covering stepped parts (1a) between the bulged ceiling wall (1A) and the ceiling wall (1D) in the rear from the side of the inner surface are installed and constructed so as not to make the cut lawn grass stay in the stepped parts (1a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges a plurality of cutting blades side by side in a row in a cutting blade case, and a rear portion of the cutting blade case in which a front end portion of a ceiling wall is located at a rear portion over substantially the entire width. The present invention relates to a lawn mower case structure for a lawn mower, in which a bulging ceiling wall formed by bulging upward from a ceiling wall is formed to reach a lawn lawn discharge port formed at one lateral end of a cutting blade case.

[0002]

2. Description of the Related Art In a cutting blade case structure of this type of lawn mower, conventionally, an internal space formed by a front end bulging ceiling wall of the cutting blade case and a front wall is formed as a discharge path of the lawn. , The choice was made to either carry out the cut grass cut with each cutting blade from the cut grass discharge port to the grass collection container or discharge it.

[0003]

When the grass that has been mowed as described above is mowed and collected in the grass container, it is usually packed in a vinyl bag and discarded. Since the bulk becomes very large, the transport efficiency of the waste treatment is poor, and it is necessary to change the treatment form. Therefore, it was also released on the surface of the grass, but since the grass to be released has a long cutting length, it can not be left alone and requires work such as scraping and incinerating again after discharging. There were things. For such a work form, the lawn is cut off and then released onto the surface of the turf, but the released turf is inserted between the shortly cut vegetation grasses, and no further processing is required thereafter. There is a work form in which the product is shredded. Although this is called mulching processing work, in the cutting blade case structure of the lawn mower, grass cut by each cutting blade is discharged from the cutting grass discharge port through the discharge path of the cutting grass. So I couldn't shred the grass so far. Therefore, in order to construct a cutting blade case suitable for mulching processing, a mulching processing space surrounding each cutting blade is formed, and recutting processing is applied to the cutting grass only in this mulching processing space to finely cut the cutting grass. A cutting blade exclusively for mulching processing, in which ceiling walls, side walls, etc. are integrally formed by pressing together with the vertical walls to form a mulching processing space by partitioning each cutting blade with vertical walls to require cutting It made up the case. However, if a separate cutting blade case for mulching processing is made separately in this way, the cutting blade case for non-mulching processing that has a grass lawn outlet at one side end will have different specifications, and two types of molds etc. It was necessary and there was room for improvement in production cost. The object of the present invention is to make a mulching process possible by making a simple modification to the cutting blade case for non-mulching process, and to make it advantageous in manufacturing. The point is to provide something that can be processed smoothly.

[0004]

In order to divide the internal space of the cutting blade case into a mulching processing space for each cutting blade, the characteristic structure according to the present invention is arranged from the inner surface of the bulging ceiling wall to the inner surface of the rear ceiling wall. In addition to forming a vertical wall over it, an inclined plate that covers the step between the bulging ceiling wall and the rear ceiling wall is provided to guide the lawn grass. On the street.

[0005]

The cut grass reaped by the cutting blade blades circulates in the mulching processing space, and during the circulation, the cutting blades are cut again by the cutting action of the cutting blades and fall in a shredded state. In this way, the mulching process space can be formed by simply adding the vertical wall to the cutting blade case, and since the front ceiling wall part is bulged, this part is substantially removed. It can be used as a capacity increment and can respond to a sudden increase in grass clippings. However, if the stepped portion between the bulging ceiling wall and the rear ceiling wall is left behind, the grass clippings may stay in that portion and fall without being re-cut. An inclined plate is provided in the part to smoothly guide the circulating grass lawn to prevent the grass from staying and suppress the discharge of the grass lawn in a long state.

[0006]

As a result, in the mulching process, the sloping plate enables sufficient shredding while being able to easily cope with a sudden increase in the amount of grass clippings. By simply providing a plate, the cutting blade case can be commonly used, and the blade can be advantageously developed.

[0007]

[Embodiment] A structure of a cutting blade case 1 of a mid-mount mower mounted on a riding lawn mower will be described. As shown in FIG. 1, three cutting blades 2 are arranged side by side in a cutting blade case 1, and the front end portion of the ceiling wall is bulged upward so that the bulging ceiling wall 1A and front wall 1B. The cut grass discharge path is formed by and the cut grass discharge port a is formed at one end on the right lateral side of the cutting blade case 1 at the tip of the cut grass discharge path. On the other hand, a vacuum plate 3 is formed from the rear wall 1C of the cutting blade case 1 toward the inside, and the vacuum plate 3 is fixed in a state along the rotation locus of the cutting blade 2, and the cutting space by the cutting blade 2 is fixed. Is formed. A mulching processing space is formed by adding the following structure to the cutting blade case 1 for non-mulching processing as described above. That is, at the intermediate position of each of the three cutting blades 2, inwardly from the front wall 1B, the V-shaped vertical walls 4 are erected at two places, and the vertical wall is closed so as to close the grass clippings outlet a. Four
An arcuate vertical wall 9 is erected between the vacuum plate 3 and the vacuum plate 3, and both vertical walls 4 and 9 are suspended from the bulging ceiling wall 1A. Step portion 1 between the bulging ceiling wall 1A and the rear ceiling wall 1D
A substantially semicircular inclined plate 5 is provided corresponding to each cutting blade 2 so as to cover a from the inner surface. As a result, the vaccum plate 3 and the vertical wall 4 form a mulching processing space, and the cut grass is shredded and dropped onto the cutting surface.

The cutting blade 2 will be described. As shown in FIGS. 2 and 3, the cutting blade 2 is replaced by the long blade 6
And a short blade 7, the long blade 6 is a normal blade having a cutting edge 6A and a rising portion 6B formed at both left and right ends, and the short blade 7 is provided at both left and right ends with an inclined pressing portion 7A and an inclined pressing portion. A cutting blade 7B is formed on the upper end of the portion 7A to form a mulching blade, and a stepped seat 6C is formed at the base end of the long blade 6,
The short blade 7 is dropped onto the stepped seat 6C and mounted so that both blades 6 and 7 form a cross while being placed. With such a configuration, the grass cut by the long blade 6 is moved toward the center of rotation, recut by the short blade 7, shredded, and the shredded floating grass cut by the slant presser 7A. It is pushed into the grass. Reference numeral 8 in the figure denotes a rubber plate scraper that is swingably provided on the inner surface of the rear wall 1C of the cutting blade case 1 and that cuts grass that accumulates linearly between the blades 2 in the traveling direction. It works by pushing in the grass and pushing it into the grass surface. When the lawnmower moves backward, the scraper 8 swings to suppress the action on the lawn surface. The scraper 8 may be attached to the scraper 8 in a vertically sliding manner instead of swinging, so that the working height can be changed.

[Other Embodiments] The vertical wall 4 may be a peripheral wall that covers the rotation locus of the cutting blades 2 over the entire circumference if the distance between the cutting blades 2 allows, and a V-shaped wall. It is not limited to one. As the cutting blade 2, only the long blade 6 may be used, and the cutting blade 7B for re-cutting and the inclined pressing portion 7A may be formed on the base end side of the cutting blade 6A of the long blade 6. Good.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a bottom view showing the internal structure of a cutting blade case.

FIG. 2 is a vertical sectional side view showing the internal structure of the cutting blade case.

FIG. 3 is an exploded perspective view showing a cutting blade.

[Explanation of symbols]

 1 Cutting blade case 1A Bulging ceiling wall 1D Rear ceiling wall 1a Stepped portion 2 Cutting blade blades 4,9 Vertical wall 5 Inclined plate a Cutting grass outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Miyata 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Minor Kyotani, 64, Ishizukitamachi, Sakai City, Osaka Prefecture In-house

Claims (1)

[Claims] 1. A plurality of cutting blades (2) are arranged side by side in the cutting blade case (1) side by side, and a front end portion of a ceiling wall of the cutting blade case (1) is provided at a rear portion over substantially the entire width. The bulging ceiling wall (1A) formed by bulging upward from the rear ceiling wall (1D) located at the position reaches the cut grass discharge port (a) formed at one lateral end of the cutting blade case (1). A lawn mower case structure formed in a state, wherein the bulging ceiling wall is provided to partition an internal space of the cutting blade case (1) into a mulching processing space for each cutting blade (2). (1A) Vertical walls (4) and (9) are formed on the inner surface, and the bulging ceiling wall (1A) and the rear ceiling wall (1
A cutting blade case structure for a lawn mower configured to guide a cut grass by providing an inclined plate (5) that covers a step (1a) with respect to D).