JPH0251050B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting control device for an internal combustion engine, which includes a starting position adjusting means for a throttle control device.

Generally, when starting a power chain saw, the throttle control device is fixed at a starting position by a holding part, and when the internal combustion engine is started at that position, the chain saw begins to idle. Therefore, if the operator of the saw incorrectly controls the saw, there is a possibility that an accident may occur. To reduce the risk of an accident, manufacturers recommend several precautions during start-up, such as holding the saw between the operator's legs or facing the ground. These methods are difficult to implement, and
In view of the fact that it can be forgotten, it seems important to create a device that eliminates the risk of injury when starting the saw.

According to the present invention, there is provided a device for coupling between a brake mechanism provided on a saw and a throttle state holding section, whereby a throttle control device (by means of the throttle state holding section) is provided. The chain saw is always braked when set for starting. As soon as the throttle retainer is released and the throttle is free, the brake must be released so that the chain can operate. For this reason, the coupling device between the throttle status holder and the brake constitutes a triggering device for a normal spring-actuated brake with some kind of trigger which, when actuated, causes the brake to spring up. operation is released, and then the brake is applied. The construction of such a device controlled by a starting control device is clearly indicated in the claims.

A specific example of such a starting control device according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 of the accompanying drawings is an elevational view of the power chain saw showing the starting control and brake in the operating position, and FIG. 2 is an elevational view showing the brake control in the starting position.

The power saw 10 generally shown here has a rear handle 11, a carrying handle 12, and a protective stirrup-shaped member 13. A finger grip 14 is shown on the rear handle 11 about an axis 15, which grip is rotatable about the axis 15 and controls a throttle (not shown) via a rod 16. Part of the grip comprises an arm 17 with two steps 18, 19, which cooperate with a throttle retaining member 20, which is journalled on an axle 21, so that the tip 22 projecting above the handle can be moved rearwardly. It can be rotated to A Bowden wire 23 as a connecting member extends from the throttle state holding member 20 and connects the multi-arm lever 2 with a shaft 25.
Its front end is tied to 4. When the throttle state holding member 20 rotates rearward, the multi-arm lever 24 moves in a similar manner. When the throttle state holding member is returned by a spring 26 as an elastic member, the lever 24 returns to its initial position.

The brake mechanism is shown on the front end of the saw body;
It is normally operated by stirrup-shaped members 13. For example, when the operator manually rotates the stirrup-shaped member 13 forward about the axis 27, the braking force is applied to the spring 28 suspended between the fixed point and the multi-arm lever 29.
caused by A brake band 30 around the centrifugal clutch drum 31, which is the chain drive part of the saw, is tensioned to brake the drum. If the operator's hand suddenly pushes the stirrup-shaped member 13, the chainsaw suddenly stops, creating a holding effect.

As mentioned above, a chain saw that rotates after the internal combustion engine has started carries the risk of an accident. According to FIGS. 1 and 2, the aforementioned trigger device includes a Bowden wire 23 as a connecting member, a lever 24 and a lever 24.
It consists of a pawl 32 on the stirrup-shaped member 13 cooperating with the pawl 32. In the driving position shown in FIG.
The lower end of the lever is fitted into the groove 34 of the pawl 32. The end of the bend 33 is then in the locked position of the multi-arm lever 29, and the brake is held in the off position. As mentioned above, the lever 24 rotates about the shaft 25 when the Bowden wire 23 is pulled (by rotation of the throttle state holding member 20). This rotation causes the bent portion 33 to move into the groove 3.
The pawl 32 slides upward on the inclined portion 35 of the pawl 32.
is rotated upwards about the axis 27 of the stirrup-shaped member 13. The lock between the multi-arm lever 24 and the pawl 32 is then released, resulting in the position according to FIG.
That is, the spring 28 rotates the multi-arm lever 24 and tensions the brake band 30 around the drum 31. In this position, the finger grip 14
The chainsaw is locked as soon as it is placed in the starting position according to FIG. When the internal combustion engine is started, the operator slowly returns the finger grip to the inside, and the contact between the lower end of the throttle state holding member 20 and the arm 17 is stopped, and the throttle state holding member 20 and the throttle state holding member 20 by the spring 26 are no longer in contact with each other. The arm lever 24 is returned to the position according to FIG. The brake is then released by rearward rotation of the stirrup-shaped member 13, whereby the hook 36 on the pawl 32 rotates the double-armed lever 29 back to the position shown in FIG.

Although I have explained this in detail above, it can be summarized as follows.

Shaft 15, arm 17, stage 18, stage 19, throttle state holding member 20, shaft 21, spring 26
a clutch mechanism, a brake band 30, a drum 31 a brake mechanism, a protective stirrup-shaped member 13,
The shaft 27, hook 36, double-arm lever 29, and spring 28 constitute a brake drive mechanism, and the Bowden wire 23, double-arm lever 24, bent portion 33, groove 34, and sloped portion 35 constitute a locking/unloading mechanism. When applying a brake between the engine shaft, the brake, and the chain saw, when the protective stirrup-shaped member 13 is manually rotated clockwise in FIG.
When the hook 36 is released, the spring 28 rotates the multi-arm lever 29 counterclockwise in FIG. 1, and the brake band 30 is tightened to brake the rotation of the drum 31.

Furthermore, when the engine is started, when the finger grip is squeezed, the throttle state holding member 20 disengages from the step 18 and the throttle state holding member 20 moves to the first position.
When the throttle is controlled by rotating counterclockwise in the figure, the Bowden wire 23 is pulled to the left, thereby rotating the double-arm lever 24 counterclockwise in FIG. is disengaged, and a brake is applied between the engine shaft and the chainsaw in the same manner as previously described.

The embodiments described above not only apply to braking mechanisms known per se, but the device can also be modified to adapt to other mechanisms. Although the illustrated throttle state holding member 20 is a preferred example for ease of description, the present invention is not limited thereto. This is because the present invention allows the throttle state holding member to be deformed.

As described above, according to the present invention, when the finger grip is placed at the engine starting position, a brake is applied between the engine shaft and the chain saw, so that the chain saw does not start abruptly when the engine is started. This makes it possible to reliably prevent accidents such as injury caused by sudden start-up of the chain saw.

[Brief explanation of drawings]

FIG. 1 is an elevational view of the power chain saw of the present invention when it is in operation;
FIG. 2 also shows an elevational view at the time of starting. 11...Rear handle, 20...Throttle condition retaining member, 23...Bowden wire, 26
...Spring, 31...Drum, 32...Pawl.

Claims (1)

[Claims] 1. A finger grip 14 for starting or stopping the engine, and clutch mechanisms 15, 17, 18, 19, 20, 21, 26 that interlock with the finger grip 14.
, brake mechanisms 30 and 31 for applying brakes between the engine shaft and the chain saw, and brake drive mechanism 1 for driving the brakes.
3, 27, 36, 29, 28, and a brake drive mechanism engaging/disengaging mechanism 23, 24, 33, 34, 35 that is linked to the rotation of the throttle state holding member 20 of the clutch mechanism, and a finger grip. 14 is placed in the engine starting position, the throttle state holding member 20 rotates and moves to remove the locking mechanism and operate the brake mechanism to apply a brake between the engine shaft and the chain saw. An engine starting control device characterized by comprising: