Self-closing door time control

When the self-closing door, e.g. a Fire Door, is opened against spring bias, door-mounted spindle C slides in pivoted stay A until spindle tooth B abuts stay peg T to rotate the spindle and cam disc D. This pivots lever H to depress plunger K of pneumatic timer L. Conic plunger end R is thus moved t...

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Bibliographische Detailangaben
1. Verfasser:	MAURICE GEORGE DIXON
Format:	Patent
Sprache:	eng
Schlagworte:	CHECKS FOR WINGS DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION FIXED CONSTRUCTIONS INDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICESFOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTOOPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOTOTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THEWING KEYS LOCKS SAFES WINDOW OR DOOR FITTINGS WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THEFUNCTIONING OF THE WING
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Beschreibung
Zusammenfassung:	When the self-closing door, e.g. a Fire Door, is opened against spring bias, door-mounted spindle C slides in pivoted stay A until spindle tooth B abuts stay peg T to rotate the spindle and cam disc D. This pivots lever H to depress plunger K of pneumatic timer L. Conic plunger end R is thus moved to part levers O to hold disc D. With door release, tooth B re-engages peg T to stop closure. The door closing force tends to turn spindle C making cam wedges E part levers O to urge cone N to return plunger K. After a pre-set time, timer air has escaped to enable plunger return, and levers O can ride over wedges E to allow tooth B to ride past peg T for door return. The timing device is assisted by the closer, and does not need external power.