Tool driving or impacting – Drive control operable by hand engaging manipulating handle
Patent
1989-07-11
1991-03-26
Yost, Frank T.
Tool driving or impacting
Drive control operable by hand engaging manipulating handle
30228, 30180, B25F 500
Patent
active
050021354
ABSTRACT:
A portable electric tool, such as, for example, shears or secateurs suitable for pruning and/or harvesting work, comprises at least one moving working component disposed at the front and of a hollow frame one part of which forms the handle of the tool and inside which are housed an electric motor and a speed reducer. The outlet of the speed reducer is connected to the moving working component by means of a transmission system which comprises a moving gear unit. The tool also includes a trigger which protrudes outside the frame and operates an electric control device. The trigger and the electric control device are connected to the moving gear unit of the moving working component and follow the movements of the component. The trigger and the control device can occupy different relative positions, so that each movement made by the trigger from a neutral position, activates the control device, which in turn starts the electric motor to move the whole unit: i.e. the moving gear unit, the trigger, and the control device which then returns automatically to the neutral position at which the trigger is immobilized either by the limit stops, or manually.
REFERENCES:
patent: 2942507 (1960-06-01), Fischer et al.
patent: 3386298 (1968-06-01), Klingler
patent: 3403738 (1968-10-01), Burkhart et al.
patent: 4109381 (1978-08-01), Pellenc
patent: 4208792 (1980-06-01), Ewig, Jr.
patent: 4359821 (1982-11-01), Pellenc
patent: 4747212 (1988-05-01), Cavdek
Drucker William A.
Etablissements Pellenc et Motte (S.A.)
Smith Scott A.
Yost Frank T.
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