Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Checks and closers – Spring and gear
Patent
1992-03-09
1993-09-14
Herrmann, Allan D.
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Checks and closers
Spring and gear
16 49, 74 8917, 185 39, 318376, 318760, E05F 300, F03G 100, F16H 1904
Patent
active
052437353
ABSTRACT:
A device for closing swinging doors of the type utilizing a rotating member to compress a spring during door opening to store energy in the spring to effect a closing of the door is provided with a driving connection to a d.c motor/generator effective to cause rotation of the motor during a closing movement of the door. The motor/generator acts as a generator during the closing with the generated electrical energy fed back to the motor/generator to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch disabling or diminishing the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.
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Herrmann Allan D.
Thomas Industries Inc.
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