JPH07675Y2 - Engine stop switch - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine stop switch, and more particularly to an engine stop switch suitable for an engine mounted on a working machine such as a lawn mower.

2. Description of the Related Art For the purpose of starting and stopping an electric spark ignition type engine, an intermittent electrical contact type switch is generally used, and this switch is separately provided at a position separated from an engine control lever for controlling the operation of the engine. It is provided.
Therefore, conventionally, a mounting member is required for each of the engine control lever and the engine stop switch, which complicates the structure, and the operator must operate the engine control lever and the engine stop switch separately. Was inconvenient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate such inconveniences of the prior art and provide a simple and convenient engine stop switch.

Means for Solving the Problems That is, an engine stop switch according to the present invention is characterized in that an engine control lever is pivotally supported and an electric contact is attached to an insulator sandwiched between an engine intake port and a carburetor. The control lever is provided with a conductive protrusion that abuts the electrical contact when in its rest position.

Therefore, the insulator insulates heat transferred from the engine to the carburetor, pivotally supports the engine control lever and mounts electrical contacts, and the engine control lever and the electrical contacts are close to each other and close to the carburetor. And can be placed on the same insulator.

Embodiment Next, the present invention will be described based on an embodiment of the drawings.

The illustrated embodiment is one in which the present invention is applied to an engine stop switch for an electric spark ignition type engine such as an air-cooled two-cycle gasoline engine mounted on a working machine such as Lonemore, and as shown in FIG. A carburetor 2 is provided close to the engine 1, and an insulator 3 made of a suitable material such as bakelite for insulating heat from the engine 1 is provided between the engine 1 and the carburetor 2. It is installed. A fuel tank 4 is provided above the vaporizer 2, and the fuel in the fuel tank 4 is supplied into the vaporizer 2 via a fuel cock 5. An air cleaner 6 is provided on the side of the carburetor 2 on the side opposite to the engine 1, the air cleaner 6 purifies external air and sends it to the carburetor 2, and the carburetor 2 applies the purified air to the purified air. The fuel from the fuel tank 4 is mixed to form a mixture, and the mixture is supplied to the engine 1 to operate the engine 1. The insulator 3 has a thin steel plate packing 7 attached to an end portion thereof close to the engine 1. The packing 7 has a function of blocking heat radiation from the engine 1 and an electric spark ignition device (not shown). It constitutes a part of the ground side circuit. Further, the insulator 3 is the vaporizer 2
An engine control lever 8 made of a steel plate press is pivotally supported by a steel bolt 21 on an extending portion 19 protruding to one side. The pivot bolt 21 also serves to electrically connect the engine control lever 8 to the packing 7 side. The engine control lever 8 is formed with an arcuate slot 9 centered on a pivot axis with the insulator 3 at its peripheral edge.
One end of a rod 10 for rotating the chain yoke valve shaft 18 of the carburetor 2 is engaged with one side end of the carburetor 2, and the engagement with the slot 9 and the rod 10 is as described later. The engine control lever 8 can be rotated between the position shown by the solid line and the position shown by the broken line in FIG. 2 in accordance with the rotation of the engine. it can. The engine control lever 8 cooperates with a governor device (not shown) to control the operation of the engine 1.

One end of a tension coil spring 12 is attached to the lower arm portion 11 of the engine control lever 8, and the other end of the spring 12 is connected to one end of a governor lever (not shown). The spring 12 acts to change the operating speed of the governor according to the position of the engine control lever 8. Further, one end of a push-pull Bowden cable 14 is connected to a lever end portion 13 of the engine control lever 8, and the other end of the Bowden cable 14 is an operation lever (not shown) provided on a handle portion of the working machine. ) Is linked to. When the engine is stopped, the lever end portion 13 of the engine control lever 8 is in the broken line position, that is, the stop position A, and the engagement between the end portion of the rod 10 and the slot 9 is released. The chain yoke valve shaft 18 is automatically rotated by the self-urging force in the direction of opening the chain yoke. During work, the operating lever is pulled to rotate the engine control lever 8 to the position indicated by the solid line in FIG. 2 against the action of the spring 12, and the lever end portion 13 thereof is moved to the high speed operation position B in FIG. It can be moved. In this position, the engine 1 operates at high speed, and the worker can work. When lowering the engine speed to a low speed, the operator returns the operation lever to move the lever end portion 13 of the engine control lever 8 to the low speed operation position C. When the operation lever is further returned to position the lever end portion 13 at the idle operation position D shown in FIG. 2, the engine 1 enters the idle operation state.

A plate-shaped electric contact 15 protruding toward the engine control lever 8 is fixed to the end portion of the extension portion 19 of the insulator 3 by a rivet 20, while the engine control lever 8 is fixed.
A projecting piece 16 is integrally formed on the surface facing the engine 1 by cutting and raising. The protruding piece 16 is
When the engine control lever 8 is in the position shown by the broken line in FIG. 2, that is, when its lever end 13 is in the stop position A, it comes into contact with the electric contact 15 and short-circuits the electric ignition circuit, whereby the engine 1 The engine 1 is stopped by cutting off the high voltage to the spark plug (not shown). Further, as soon as the lever end portion 13 starts moving counterclockwise from the stop position A as seen in FIG. 2, the projecting piece 16 separates from the electric contact 15 and causes the electric ignition circuit of the engine 1 to operate normally, so Can be started. In the figure, 17 is the electrical contact 15
It is a non-grounded electric wire of the magneto connected to.

When the engine control lever 8 is swinging from the A position to the B position in FIG. 2, the end of the rod 10 is idle in the slot 9, so that the chuck yoke is opened. However, when the engine control lever 8 is moved beyond the high-speed operation position B to the jaw yoke position E when the engine is started, the end of the rod 10 is engaged with one side of the slot 9 and the jaw yoke is closed. .

Effect of the Invention With the configuration of the present invention described above, the present invention does not require measures for mounting the engine stop switch, and does not require mounting measures such as a bracket for mounting the engine control lever. Since the engine stop switches can be arranged close to each other and close to the carburetor, various engine interlocking operations can be facilitated, manufacturing costs can be reduced, and serviceability is high.

[Brief description of drawings]

1 is a side view of a main part of a working machine provided with an engine stop switch according to the present invention, and FIG. 2 is a front view of the main part of FIG. DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Vaporizer, 3 ... Insulator, 8 ... Engine control lever, 15 ... Electrical contact point, 16 ... Conductive protruding piece.

Claims (1)

[Scope of utility model registration request] 1. An intake port of an engine (1) and a carburetor (2)
The engine control lever (8) is pivotally supported on the insulator (3) sandwiched by and, and the electric contact (15) is attached to the electric contact when the engine control lever is in its stop position (A). Engine stop switch provided with abutting conductive protrusions (16).