Door arrestors

Details Door arrestors Door arrestors

1977-04-01

1978-05-16

Feldbaum, Ronald

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Closure checks

E05F 502

Patent

active

040890830

ABSTRACT:
A door arrestor which can be fitted to the lintel of a door frame. The arrestor has a body part which is secured to the lintel and a plunger part which projects from the body part and can move into the body part when struck by the closing door. For a door shutting rapidly the plunger is arrested after completing only a part of its movement and hence the door is arrested before it closes. For a door shutting slowly the plunger is free to complete its whole movement and hence the door is allowed to close. The plunger moves against the action of a spring so that when the door is re-opened the plunger projects again from the body part. The plunger carries a headless loose pin movable in a slot in the plunger and in slots in the body part. With a rapid shutting door the pin is trapped before it completes a full movement and this trapping arrests the plunger. With a slow shutting door the pin has time to fall under gravity to escape being trapped and hence is freed to complete a full movement in its slots.

REFERENCES:
patent: 615034 (1898-11-01), Merrill
patent: 1394420 (1921-10-01), Lawrence
patent: 1561726 (1925-11-01), Kerr
patent: 1858886 (1932-05-01), DeGuenther
patent: 2869171 (1959-01-01), Levine

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