Circuit arrangement for counterclockwise and clockwise rotation

Details Circuit arrangement for counterclockwise and clockwise rotation Circuit arrangement for counterclockwise and clockwise rotation

1983-01-17

1984-07-10

Truhe, J. V.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318305, 318336, 200 1V, 200157, H02P 124, H02P 318, H02P 736

Patent

active

044595220

ABSTRACT:
In a portable power tool, two switches are provided in the handle for respectively effecting rotation of the electric motor in opposite directions. Each switch has a center contact movable between a rest contact and a working contact, the armature of the motor being connected between the two center contacts. Preferably, a common rocker actuates the two switches individually or jointly. In both the rest position of the two switches and in the case when both switches are jointly actuated, intentionally or unintentionally, the armature is short-circuited and braking occurs. Two platelets of electrically conductive synthetic material may advantageously be used as end stops for the switches so that the speed in either direction of rotation is controlled by the pressure of the operator's finger on the selected switch.

REFERENCES:
patent: 1732711 (1929-10-01), Boddie
patent: 1804086 (1931-05-01), Brodt
patent: 3243680 (1966-03-01), Burns
patent: 3413498 (1968-11-01), Bowen
patent: 3445609 (1969-05-01), Cardenas
patent: 3775576 (1973-11-01), Brown
patent: 3942604 (1976-03-01), Black
patent: 4002961 (1977-01-01), Chang
patent: 4205434 (1980-06-01), Brozoski et al.

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