JPH06225615A - Walking type lawn mower - Google Patents

Abstract

PURPOSE:To enable the rapid and easy practice of regulation of front and rear wheels in a walking type lawn mower equipped with the front and rear wheels capable of freely regulating the height in the front and rear of a cutting blade housing. CONSTITUTION:Front and rear wheels 4 and 5 attached to the front and rear of a cutting blade housing 2 are connected through a quadric link mechanism (A) to construct the front and rear wheels 4 and 5 so as to simultaneously and freely regulate the height. A spring 19 for reducing the load capable of urging the front and rear wheels 4 and 5 downward is simultaneously installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking lawn mower.

[0002]

2. Description of the Related Art A conventional walk-behind lawn mower is a 64-1-2
As shown in Japanese Patent No. 8824 and Japanese Utility Model Laid-Open No. 4-9519, when adjusting the cutting height, the front and rear wheels mounted vertically swingably on the front and rear of the cutting blade housing are separately adjusted. Has become.

[0003]

When the front and rear wheels are adjusted separately, there is a problem in height adjustment, and when pushing down the wheels to increase the cutting height, it is necessary to resist the load on the machine. Since the cutting blade housing has to be lifted up with a great amount of labor, the adjustment of the cutting height has been troublesome.

An object of the present invention is to devise a structure for adjusting the height of a wheel so that the cutting height can be adjusted quickly and easily.

[0005]

The characteristic structure of the present invention for achieving the above object is to connect the front and rear wheels mounted on the front and rear of the cutting blade housing through a four-link mechanism to the front and rear wheels. The height of the rear wheels is adjustable at the same time, and a spring for urging the front and rear wheels downward is provided.

[0006]

[Function] Since the front and rear wheels are linked via the four-link mechanism, the height of the front and rear wheels can be adjusted at the same time. Further, since the springs for urging the front and rear wheels downward, that is, the springs for reducing the load are provided, the height of the wheels can be adjusted with a light operating force.

[0007]

As a result of the above construction, the height of the wheel can be adjusted quickly and easily.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a vertical engine 3 having an output shaft directed downward is mounted on the upper surface of a cutting blade housing 2 in which a bar blade 1 which is rotationally driven about a vertical axis is installed. Height-adjustable front and rear wheels 4 and 5 are provided at the front and rear of the cutting blade housing 2, and a steering handle 6 is provided at the rear portion of the cutting blade housing 2 to form a self-propelled walk-type lawn mower.

The output of the engine 3 is transmitted to the blade 1 via a clutch (not shown) and is transmitted to the bevel gear mechanism 8 of the rear wheel 5 via the belt transmission device 7 to drive the rear axle 9. , A gear 9a mounted on the end of the rear axle 9
The rear wheel 5 can be driven by driving the internal gear 5a of the rear wheel 5 via.

The front wheel 4 is mounted on the tip of an arm 10 which is mounted on the cutting blade housing 2 so as to be swingable around the horizontal axis X, and is freely rotatable. The left and right front wheels 4 and 4 are integrally swingable up and down by being connected via a rod 11 extending along.

The rear wheel 5 is rotatably mounted on the tip of an arm 12 which is fitted around the rear axle 9 in a freely rotatable manner. The left arm 12 is provided with a plurality of locking portions 12a. The left arm 12 and the right arm 12 are connected to each other via a rod 15 extending in the lateral direction so that the left and right rear wheels 5 and 5 can be integrally swung up and down.

Then, the arm 10 of the left front wheel 4 and the arm 12 of the left rear wheel 5 are connected via a link 17 in the front-rear direction, and the heights of the front and rear wheels 4, 5 are adjusted simultaneously. A quadruple link mechanism A is formed, and a bracket 18 extending from the engine mounting base 3a and the link 17 are provided.
A spring 19 for reducing the load is installed over and to urge the front and rear wheels 4 and 5 to swing downward.

On the outer surface of the cutting blade housing 2, a wheel height adjusting lever 20 which is an elastic rod engageable with the engaging portion 12a of the arm 12 is fixedly connected.
When the adjusting lever 20 is tilted toward the inside of the body along the lever guide 21 to release the engagement with the locking portion 12a, the arm 12 is rotated counterclockwise by the urging force of the spring 19 and is relatively moved. The cutting blade housing 2 is raised to adjust the height of the blade above ground.

The spring 19 is set to an urging force that is substantially balanced with the load of the machine body, and the steering handle 6 is provided.
The cutting height can be adjusted by lightly pushing down or lifting.

As shown in FIG. 6, the cutting blade housing 2
Is formed in an elliptical shape that is long in the front-rear direction so that the grass pushed down by the front lower edge of the peripheral wall of the cutting blade housing can easily return to the standing posture. It is made so that the lawn is not easily caught in the corner 2a.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view showing a wheel height adjusting structure.

FIG. 2 is a side view showing an operating state of the same.

FIG. 3 is a partially cross-sectional plan view of the same.

FIG. 4 is a vertical sectional front view showing the inside of the cutting blade housing.

FIG. 5 is a rear view showing a wheel height adjusting structure.

FIG. 6 is a cross-sectional plan view of the cutting blade housing.

FIG. 7 is a perspective view of a lawn mower.

[Explanation of symbols]

 2 Cutting blade housing 4 Front wheel 5 Rear wheel 19 Spring A Quad link mechanism

Claims (1)

[Claims] 1. The front and rear wheels (4) by connecting front and rear wheels (4), (5) mounted in front of and behind the cutting blade housing (2) through a four-link mechanism (A). , (5) can be simultaneously adjusted in height, and the front and rear wheels (4),
A spring (1) for reducing the load that biases (5) downward.
A walk-behind lawnmower equipped with 9).