Device in a power-driven tool

Details Device in a power-driven tool Device in a power-driven tool

1997-11-19

2001-01-30

Argenbright, Tony M. (Department: 3747)

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

C123S400000

Reexamination Certificate

active

06178941

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a device in a power-driven tool such as a motor saw, including a handle having a gas control rotatably attached thereto.
The gas control of a power-driven tool is used to control the speed of revolution of the engine, and in order to prevent unintentional actuation of the gas control a gas control catch is provided which catches the gas control in an unactuated position. Thus, before the gas control can be actuated, the catch must be released. The gas control and the gas control catch are provided with pivots journalled in complementary bearing cups in the handle. During assembly, the gas control and the gas control catch are mounted in their respective positions in the handle and a guide pin, usually made of steel, is subsequently inserted through a complementary bore in the gas control and the gas control catch, respectively. This bore must thus be accurately aligned with the bearing cup which means that the assembly will be relatively complicated and time consuming.
SUMMARY OF THE INVENTION
It is an object of the invention to eliminate the above-mentioned drawback of the prior art and to enable rapid and simple assembly of the gas control and the gas control catch in a power-driven tool. This object has been achieved by a device according to the invention the gas control has at least one pivot and the handle has resilient bearing means allowing the gas control to be mounted against the action of a resilient force and, after mounting, holding the pivot rotatably in the handle.


REFERENCES:
patent: 4302880 (1981-12-01), Elfving et al.
patent: 4386746 (1983-06-01), Okamura
patent: 4495911 (1985-01-01), Andreasson
patent: 4524741 (1985-06-01), Corbi
patent: 4570593 (1986-02-01), Take et al.
patent: 4798185 (1989-01-01), Driggers
patent: 4951846 (1990-08-01), Oster et al.
patent: 5517967 (1996-05-01), Nakayama

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