Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1983-11-14
1984-10-30
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 48, 192 2, H02K 710
Patent
active
044802056
ABSTRACT:
An automatic brake control for rotary electric tools such as saws, drills, sanders, grinders and the like comprises a pair of spring biased brake shoes positioned about the periphery of the brake drum of an electric motor which drives the tools. The brake shoes are normally spring biased into engagement with the brake drum which is placed around the fan which in turn is pressed onto the armature shaft. Upon actuation of the motor, a cam element moves the brake shoes back from the drum and into an anchor recess at one end, permitting the motor to operate the tool. The cam element is actuated by a linkage coupled to the trigger through an intermediate pivot plate. When pressure is released on the trigger, the brake shoe springs take over snapping the shoes into contact with the drum and moving the linkage back to the starting position. This action immediately stops the tool and eliminates possible safety problems.
REFERENCES:
patent: 2807732 (1957-09-01), Kurtovich
patent: 2813206 (1957-11-01), Jensen
patent: 2839168 (1958-06-01), Casper
patent: 2876369 (1959-03-01), Doerner
patent: 2998956 (1959-08-01), Zern
patent: 4029159 (1977-06-01), Nymann
Budd Mark O.
Spellman, Jr. Martin J.
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