Door position monitor with automatic adjustment

Movable or removable closures – Closure condition signal or indicator – Indicator at remote station

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Details

49 15, 74531, 200 6162, G08B 1308

Patent

active

045626642

ABSTRACT:
There is disclosed a door position monitoring assembly for a security door installation wherein the assembly can be adjusted and preset from the exterior of the assembly. In this regard, the monitoring assembly includes a base member with switching means carried by the base member and capable of being operated to attain a first condition and a second condition, each of which conditions can be detected by suitable circuit means. A control arm produces operation of the switching means and has one end thereof coupled for movement with said door and the other end piotally mounted to the base member. An actuator means is provided for operatively coupling said pivotally mounted end of the control arm with the switching means such that when the door is open said switching means will be in said first condition, rotation of said control arm upon movement of the door to a substantially closed position producing said second condition of said switching means and initial movement of the door away from said substantially closed position permitting said switching means to return to said first condition, so that very slight opening movement of the door can be detected. The actuator means further includes self-aligning means positionable prior to installation of said monitoring assembly for automatically presetting and adjusting said actuator means from the exterior of the assembly to assure proper operation thereof in conjunction with any given door installation without regard for variations in the door installations.

REFERENCES:
patent: 1531107 (1925-03-01), Larson
patent: 1604209 (1924-07-01), Wenzel
patent: 3145276 (1964-08-01), Brown et al.
patent: 3832804 (1974-09-01), Goldsmith
patent: 3973357 (1976-08-01), Kluempers
patent: 3987687 (1976-10-01), Bland et al.
patent: 4334388 (1982-06-01), Kambic

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