Dual control handle for pneumatic tree trimmer

Details Dual control handle for pneumatic tree trimmer Dual control handle for pneumatic tree trimmer

1989-03-01

1990-08-21

Watts, Douglas D.

Cutlery

Cutting tools

Plural cooperating blades

30180, 30228, 292833, B26B 1300, B26B 1700, B26B 1500, D02J 118

Patent

active

049494619

ABSTRACT:
A trimmer device is disclosed which comprises cutting blades which are to be used for a trimming operation. A hollow air hose, through which pressurized fluid is supplied to the trimmer device, is provided. First and second selectively openable and closable valves are connected with one another and are disposed between the cutting blades and the hollow air hose. The trimmer device is formed with a passage therein which connects the hollow air hose to the first selectively openable and closable valve, the second selectively openable and closable valve, and the cutting blades. Handles, by which an operator can manually open and close each of the first and second selectively openable and closable valves independently, are pivotally mounted on the trimmer device. Each of the first and second selectively openable and closable valves are biased into a closed position prior to the trimming operation. Pressurized fluid is allowed to pass from the air hose, through which pressurized fluid is supplied, to the cutting blades to perform the trimming operation only when both of the first and second selectively openable and closable valves are manually opened by the operator.

REFERENCES:
patent: 2257245 (1941-09-01), Rudolph
patent: 2751943 (1956-06-01), Ford
patent: 3373490 (1968-03-01), Lendaro
patent: 3561117 (1971-02-01), Murbach
patent: 4109381 (1978-08-01), Pellenc
patent: 4359821 (1982-11-01), Pellenc
patent: 4587732 (1986-05-01), Lind et al.
patent: 4734983 (1988-04-01), Brick

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