Security device for exit doors

Details Security device for exit doors Security device for exit doors

1996-07-10

1998-03-17

Meyers, Steven N.

Locks

Operating mechanism

Key

70339, 70337, E05B 1100

Patent

active

057274070

ABSTRACT:
An exit door has a security device comprising a flexible member, e.g. a chain, for connecting two locking devices which may be fixed on a door and doorway or on double doors. The first locking device is operable by a first key removable only when the locking device is activated and a second key removable only when the locking device is deactivated. One end of the flexible member is fixed to the second key and the other end is fixed to the second locking device, which is operable by the second key, being removable from the second locking device only when it is activated, and by a third key removable only when the second locking device is deactivated. The security devices are members of a series of such security devices in which the third key of each security device serves as the first key of the next security device in the series. The last key in the series is essential to operation of a control unit permitting use of a building provided with the exit door.

REFERENCES:
patent: 2220786 (1940-11-01), Grainger
patent: 2966053 (1960-12-01), Mintz
patent: 4651544 (1987-03-01), Hungerford
patent: 4815305 (1989-03-01), Smith
patent: 5285666 (1994-02-01), Bartnicki
patent: 5460020 (1995-10-01), Hungerford

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