JPH06296414A - Walking type lawn mower - Google Patents

Abstract

PURPOSE:To make it possible to rapidly and readily carry out height adjustment of wheels in a walking type lawn mower provided with wheels capable of freely adjusting the height before and behind a reaping blade housing and simultaneously suppress deviation of height of lateral front wheels. CONSTITUTION:Pairs of lateral front and rear wheels 2 and 3 are connected through a parallel quadruple wheel link mechanism R to integrally constitute the height to be adjustable, and simultaneously, supporting arms 11 and 11 of a pair of lateral front wheels 2 and 2 are mutually connected through other connecting shaft 12 different from an oscillating supporting shaft 10 of the front wheel.

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, in adjusting the cutting height, the front and rear wheels mounted on the cutting blade housing in a vertically swingable manner are separately adjusted. Has become.

[0003]

If the front and rear wheels are adjusted separately, the height adjustment of the wheels is troublesome and there is a problem.
An object of the present invention is to make the height adjustment of the wheels quick and easy by devising the height adjustment structure of the wheels, and to prevent the height adjustment of the left and right front wheels from being confused. .

[0004]

A characteristic configuration of the present invention for achieving the above object is to provide a pair of left and right front and rear wheels, which are vertically swingably attached to the front and rear of a cutting blade housing, with a parallel four-link mechanism. The pair of left and right front and rear wheels are integrally height-adjustable by connecting the support arms of the pair of left and right front wheels via another connecting shaft different from the swing fulcrum shaft of the front wheels. It is that they are connected to each other.

[0005]

As shown in FIG. 1, when the height of the rear wheel 3 is adjusted by the adjusting lever 18, the height of the front wheel 2 is also adjusted at the same time via the parallel four-link mechanism R.

In adjusting the heights of the front and rear wheels integrally, in the present invention, as shown in FIGS. 1 and 2,
Since the support arms 11 and 11 of the left and right front wheels 2 and 2 are connected to each other via a connecting shaft 12 that is different from the swing fulcrum shaft 10 of the front wheel 2, for example, the support arms 11 and 11 of the left and right front wheels 2 and 2,
As in the case of connecting 11 to each other via a connecting shaft that also functions as a swing fulcrum shaft, the connecting shaft is not subjected to a torsional force due to front wheel load, that is, the support arms 11 of the left and right front wheels 2 and 2. 1
When 1 is connected to each other via the connecting shaft that also functions as the swing fulcrum shaft, the other front wheel load acts on the connecting shaft that also functions as the swing fulcrum shaft about the swing fulcrum shaft and twists the connecting shaft. Force acts on the support arms 11, 11 of the left and right front wheels 2, 2.
Are connected to each other via the swing fulcrum shaft 10 and another connecting shaft 12, so that the connecting shaft 12 is not subjected to a torsional force due to the front wheel load. Since it works to prevent the twisting force that acts on the front wheel, the height of the front wheels on the left and right does not easily change.

[0007]

As a result of the above construction, the height of the wheels can be adjusted quickly and easily, and it is possible to suppress the height deviation of the left and right front wheels.

[0008]

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

As shown in FIG. 4 and FIG. 6, a cutting blade housing 1 having a bar blade 1a which rotates around its longitudinal axis installed therein.
A pair of left and right front and rear wheels with adjustable height are provided in front and back of the cutting blade, and the engine 4 is mounted on the upper portion of the cutting blade housing 1 and the grass collecting bag 5 is attached to the rear surface of the cutting blade housing 1. The steering handle 6 is extended rearward and upward from the cutting blade housing 1 to form a self-propelled walk-type lawn mower.

As shown in FIG. 3, the output from the engine 4 is transmitted through a belt transmission 7 to a bevel gear mechanism 8 for the rear wheel 3.
To drive the rear axle 9, and drive the rear wheel 3 by driving the internal gear 3a of the rear wheel 3 via the gear 9a attached to the end of the rear axle 9.

As shown in FIG. 1, the front wheel 2 is rotatably mounted on the tip of a support arm 11 which is swingably attached to the cutting blade housing 1 via a horizontal shaft 10, and The left and right front wheels 2, 2 are connected to each other via a connecting rod 12, which is a connecting shaft different from the horizontal shaft 10, which is the swinging fulcrum shaft of the front wheel 2, between the left and right support arms 11, 11. It is configured to be vertically swingable integrally.

The rear wheel 3 is freely rotatably mounted on the tip of a support arm 13 fitted onto the rear axle 9, and the left arm 13 is provided with a plurality of locking portions 13a. The right arm 13 and the right arm 13 are connected to each other through a connecting rod 14 which is a connecting shaft different from the rear axle 9 which is a swinging fulcrum shaft of the rear wheel 3 to connect the left and right rear wheels 3 to each other. , 3 are integrally swingable up and down.

Then, the support arm 11 for the left front wheel 2
And a support arm 13 for the left rear wheel 3 via a front-rear direction link 15 to integrally oscillate the front / rear wheels 2 and 3 up and down. The mechanism R is configured.

The support frame 1 for the steering handle 6
A gas damper 17 for reducing the load is installed so as to span between 6 and the support arm 13 of the rear wheel 3, and the front and rear wheels 2 and 3 are urged to swing downward.

As shown in FIGS. 1 and 5, the engaging portion 13 of the support arm 13 is provided on the outer surface of the cutting blade housing 1.
Wheel height adjusting lever 18 composed of an elastic rod engageable with a
Is provided with its lower end fixedly connected, and when the adjusting lever 18 is tilted toward the inside of the body along the lever guide 19 to release the engagement with the locking portion 13a, the support arm 13 causes the gas to move. It is rotated counterclockwise by the urging force of the damper 17 to relatively raise the cutting blade housing 3 and adjust the ground height of the blade in the cutting blade housing 1.

The urging force of the gas damper 17 is set so as to be approximately balanced with the airframe load, and the height of the wheels can be adjusted by lightly pushing down or lifting the steering handle 6. .

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 front / rear wheel connecting structure.

FIG. 2 is a side view showing a wheel height adjustment state.

FIG. 3 is a cross-sectional plan view.

[Fig. 4] Front view in vertical section

FIG. 5 Partially cutaway rear view

FIG. 6 is a perspective view of the entire lawn mower.

[Explanation of symbols]

 1 Cutting blade housing 2 Front wheel 3 Rear wheel 10 Swing fulcrum shaft 11 Support arm 12 Connecting shaft R Parallel four-link mechanism

Claims (1)

[Claims] 1. A pair of left and right front and rear wheels (2) and (3) mounted on the cutting blade housing (1) so as to be able to swing up and down, are connected via a parallel four-link mechanism (R). Left and right front
The rear wheels (2) and (3) are integrally configured so that their heights are freely adjustable, and the pair of left and right front wheels (2) and (2) support arms (11) and (11) are connected to each other by the front wheel (2). A walk-behind lawn mower, which is connected to each other via another connecting shaft (12) different from the swinging fulcrum shaft (10).