Emergency exit lock system for doors
AssigneeDetex Corporation
InventorMichael Pappas
Life of this patent
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Abstract
A lock system controls exiting and entering of personnel, particularly in public and commercial structures by means of an alarm and a panic bar and key system to operate a lock through a series of interlocking controls including an internal panic bar, an internal key lock, an external key lock and a supplemental manual control. Four modes of operation are provided in which the panic bar is at all times operative and the alarm is selectively operative to provide, in addition to panic bar actuation or in combination therewith, authorized passage, authorized exit only, free passage in both directions and free exit only.
Claims11
Exit and entry control lock apparatus for doors comprising, in combination:
- a. a latchbolt for releasably holding the door in closed position;
- b. dead latch means for securing the latchbolt against release;
- c. first and second independently operable dead latch release actuators, said second release actuator comprising:
- i. a control member movable between active and inactive positions, and
- ii. a mode control member movable between two positions to secure the control member selectively in either of its positions;
- d. a panic bar connected to the first release actuator;
- e. a key-actuated means connected to the second release actuator;
- f. an alarm and energizing means therefor;
- g. an alarm-energizing control switch connected to be actuated upon actuation of the panic bar;
- and
- h. alarm-disabling switch means coupled to said key-actuated means to disable the alarm-energizing means.
Dependencies are inferred from the claim text.