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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E05F1/08
spring-actuated; , e.g. for horizontally sliding wings
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E05F1/10
for swinging wings; , e.g. counterbalance
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E05F1/1091
with a gas spring
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