Patent classifications
E
FIXED CONSTRUCTIONS
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E05
LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
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E05F
DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
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1/00
Closers or openers for wings, not otherwise provided for in this subclass
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E05F1/02
gravity-actuated; , e.g. by use of counterweights
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E05F1/04
for wings which lift during movement; , operated by their own weight
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E05F1/06
Mechanisms in the shape of hinges or pivots, operated by the weight of the wing
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