Motor-driven chain saw having a lubricating oil pump

Cutlery – Combined cutlery or combined with ancillary feature – With means to apply transient fluid to tool

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Details

30382, 83169, B23D 5904, B23D 5702, B26D 708

Patent

active

051844036

ABSTRACT:
The invention is directed to a motor-driven chain saw having a drive motor which drives a saw chain via a sprocket with the saw chain running around the periphery of the cutter bar in a guide groove formed in this periphery. A brake device is provided to bring the saw chain to standstill which is actuated by a brake lever. In addition, the drive motor continuously drives a lubricating-oil pump which is mounted in a feed line between the supply tank and a outlet opening of the guide groove. The supply of lubricating oil is interrupted when the saw chain is brought to standstill. This is achieved by providing a blocking valve in the feed line which is closed during idle operation of the drive motor and is opened during load operation of the drive motor.

REFERENCES:
patent: 3865213 (1975-02-01), McDermott
patent: 4353163 (1982-10-01), Overbury et al.
patent: 4636147 (1987-01-01), Schweitzer et al.
patent: 4651423 (1987-03-01), Grogan
patent: 4683660 (1987-08-01), Schurr
patent: 4753012 (1988-06-01), Schurr
patent: 4819332 (1989-04-01), Sugihara et al.
patent: 4847999 (1989-07-01), Nagashima

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