Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Reexamination Certificate
2001-03-30
2003-06-24
Solis, Erick (Department: 3747)
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
C123S179180
Reexamination Certificate
active
06581568
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a manually guided implement, having a drive motor, and a grip for guiding the implement. A gas throttle is pivotably mounted on the grip and is connected by a transmitting means to a carburetor of the drive motor. An arresting element is held on the gas throttle for the releaseable arresting of the throttle on the grip, whereby the arresting element is adjustable relative to the gas throttle.
U.S. Pat. No. 4,302,880 discloses a gas throttle having an arresting element for a motor-driven implement, namely a power chainsaw. The arresting element is rotatably mounted in the grip of the implement, and by means of finger-like dogs formed on one end thereof can be brought into engagement with the gas throttle, which is rotatably mounted on the grip. With the aid of the arresting element the gas throttle can be arrested, for example, in a starting throttle position. The arresting element is operatively connected with the gas throttle in such a way that operation of the gas throttle is precluded unless the arresting element is first actuated. Unfortunately, the structural configuration of this known arrangement is very complicated and unreliable during operation.
It is also known to embody a gas throttle of a manually guided motor-driven implement, such as a brush cutter, in such a way that it is monolithic with an arresting element, whereby the arresting element can be brought into arresting engagement with the grip of the implement by elastic deformation by the operator. In the arresting engagement, a starting throttle position of the gas throttle is provided. If the arresting position is unintentionally maintained over a long period of time, for example during the winter, the elastic restoration of the arresting element on the gas throttle is no longer ensured, for example due to material fatigue; the idling position of the gas throttle can then no longer be achieved.
It is therefore an object of the present invention to improve a manually guided implement of the aforementioned general type in such a way that the starting throttle position of the gas throttle can be easily set and can again be released in a functionally reliable manner.
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Andreas Stihl AG & Co.
Becker R W
R W Becker & Associates
Solis Erick
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