JPS6351284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a locking mechanism for, for example, an operating lever that rotates and stops the blades of a lawn mower and a self-propelled lever that causes the lawn mower to travel.

2. Description of the Related Art Small working machines such as lawn mowers and power tillers perform work by driving work members such as blades while moving the machine body. For this reason, many small working machines share a lever for driving and stopping the working members.

However, with this structure, when a small working machine is moved from a storage location such as a garage to a work location, the blade and other work components must be driven, and the blade may bite into stones on the road surface and damage the blade. It happens. Therefore, the small working machine must be moved by hand.

For this reason, a mechanism as shown in FIGS. 1 and 2 has been proposed. Fig. 1 is a side view of the handle of the lawn mower, and Fig. 2 is a rear view as seen from direction A in Fig. 1.A bracket 2 is fixed to the handle 1,
A shaft 3 is inserted into this bracket 2, a self-propelled lever 4 and a blade operating lever 5 are rotatably attached to the shaft 3, and a latch 6 is rotatably pivoted to the base of the operating lever 5. The base end of a rod 7 extending along the operating lever 5 is fixed to the base of the latch 6, a push button 8 is attached to the tip of the rod 7, and a shutter 9 is provided on the push button 8.

If the push button 8 protrudes from the operating lever 5 as shown in FIG.
is also located above, so that the self-propelled lever 4 does not interfere with the shutter 9 even if the self-propelled lever 4 is rotated. Therefore, only the lawn mower can be run without rotating the blade.
To mow the lawn at the same time as the vehicle is running, push the push button 8 downward. Then, the engagement between the bracket 2 and the latch 6 is released, and at the same time, the shutter 9 moves downward and enters the rotation locus of the self-propelled lever 4. As a result, when the self-propelled lever 4 is rotated forward, the self-propelled lever 4 and the shutter 9 come into contact with each other, and the operating lever 5 is also rotated forward, causing the blade to rotate. Therefore, both the self-propelled lever 4 and the operating lever 5 can be operated with one hand.

In the conventional device described above, only the self-propelled lever can be operated independently when the rotation of the blade is not required, and the self-propelled lever and the control lever can be operated simultaneously during work. In order to rotate the lever forward, it is first necessary to press a push button to release the engagement between the latch and the bracket, which is cumbersome to operate.

The present invention has been made in view of the above points, and an object thereof is to be able to independently operate an operating lever that drives a working member such as a blade and a self-propelled lever, and to enable the self-propelled lever and the operating lever to be operated independently. It is an object of the present invention to provide a locking mechanism for a self-propelled lever and an operating lever of a working member, which allows the lever to be easily operated at the same time.

In order to achieve such an object, the present invention fixes a bracket to the handle of a small working machine, and attaches to this bracket an operating lever for driving and stopping a working member such as a blade, and a self-propelled lever of the small working machine. The working member is configured to be freely attached, and the working member is brought into a driving state by rotating the operating lever toward the handle, and the small working machine is rotated by rotating the self-propelled lever toward the handle. The shutter member provided on the operating lever is configured to be in a self-propelled state, and when the operating lever is rotated in the direction of the handle, a shutter member provided on the operating lever is projected into the rotation locus of the self-propelled lever, and the shutter member of the operating lever is It is characterized in that the shutter member is configured to engage with the self-propelled lever when the shutter member is rotated in the direction of the handle.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

The embodiment shows an example in which the locking mechanism according to the present invention is applied to a lawn mower, and FIG. 3 is a side view of the handle of the lawn mower, and FIG. 4 is a rear view as seen from direction A in FIG. 3.
FIG. 5 is an exploded perspective view of members constituting the locking mechanism.

A bracket 11 is provided vertically on the curved portion of the handle 10, and a self-propelled lever 13 and an operating lever 14 are rotatably attached to a shaft 12 provided on the bracket 11. When the self-propelled lever 13 is turned counterclockwise in FIG.
4 in the counterclockwise direction, another clutch is turned on and the blade, which is the working member, is rotated.

The self-propelled lever 13 and the operating lever 14 are rotatable independently of each other, and the self-propelled lever 13 is biased clockwise in FIG. 3 by a return spring (not shown), and the operating lever 14 is biased by a return spring 15, respectively. ing. A cam 17 is connected to the base of the operating lever 14 via a pin 16.
A spring 18 is stretched between one end of the cam 17 and the shaft 12, and the cam 17 is biased counterclockwise in FIG.

Further, a lower end portion of a rod 19 is fixed to one end of the cam 17, and this rod 19 is disposed along the back side of the operating lever 14, and a shutter 20 is fixed to the tip thereof. The shutter 20 includes a self-propelled lever 13 and an operating lever 14.
When both are rotated rearward, as shown in FIG. 4, they are in the upper position so as not to interfere with the rotation of the self-propelled lever 13. Therefore, in this state, only the self-propelled lever 13 can be rotated forward, and if only the self-propelled lever 13 is rotated forward in this way, the blade will rotate. You can run the lawn mower without any problems.

Next, the operation of the present invention will be explained based on FIGS. 6 and 7.

First, the operating lever 14 is rotated slightly forward about the shaft 12 from the state shown in FIG. Then, the pin 16 to which the cam 17 is pivotally attached also rotates about the shaft 12, and as a result, the tip 17a of the cam 17 rides on the bottom surface 11a of the bracket 11. When the tip 17a of the cam 17 rides on the bracket 11, the cam 17 rotates clockwise about the pin 16 while pulling the spring 18. As the cam 17 rotates, the rod 19 is pulled downward, and the shutter 20 fixed to the tip of the rod 19 moves downward, so that the self-propelled lever 13 and the shutter 20 overlap as shown in FIG.

Therefore, when the self-propelled lever 13 is rotated forward, the shutter 20 is locked to the self-propelled lever 13, and the operating lever 14 is also rotated forward together with the self-propelled lever 13. As a result, by simply operating the self-propelled lever 13 with one hand, the lawn mower can run and the lawn can be cut at the same time.

Although the illustrated example shows an example in which the locking mechanism according to the present invention is applied to a lawn mower, the present invention is not limited to this.
It can also be applied to small working machines such as tillers.

As explained above, according to the present invention, when the operation lever is rotated toward the handle, the shutter member provided on the operation lever is rotated toward the handle within the rotation locus of the self-propelled lever, and then the self-propelled lever is rotated toward the handle. When rotated toward the handle, the shutter member and the self-propelled lever engage, making it easy to operate the self-propelled lever and the operating lever simultaneously with one hand.
Furthermore, the operating lever and self-propelled lever can be operated independently, which provides many effects such as greatly improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side view of the conventional mechanism, FIG. 2 is a rear view as seen from direction A in FIG. 4 is a rear view seen from direction A in FIG. 3, FIG. 5 is an exploded perspective view of the members constituting the locking mechanism of the present invention,
FIG. 6 is a side view similar to FIG. 3 illustrating the function of the locking mechanism, and FIG. 7 is a rear view similar to FIG. 4 illustrating the function of the locking mechanism. In the drawings, 10 is a handle, 11 is a bracket, 12 is a shaft, 13 is a self-propelled lever, 14 is an operating lever, 17 is a cam, 19 is a rod, and 20 is a shutter.

Claims (1)

[Claims] 1. A bracket is fixed to the handle of a small working machine, and an operating lever for driving and stopping a working member such as a blade and a self-propelled lever of the small working machine are rotatably attached to the bracket, and The work member is configured to be in a driving state by a rotational operation toward the handle, and the small working machine is configured to be in a self-propelled state by a rotational operation of the self-propelled lever in the direction of the handle. , when the operating lever is rotated in the direction of the handle, a shutter member provided on the operating lever is projected into the rotation locus of the self-propelled lever, and when the self-propelled lever is rotated in the direction of the handle, the A locking mechanism between an operating lever of a work member and a self-propelled lever, characterized in that a shutter member is configured to engage with the self-propelled lever.