US 4,283,882 A · Safety flush bolt entrance door system

Abstract

A safety flush bolt entrance door system includes a pair of doors mounted in an entrance frame for outward opening with each door pivotally supported for individual opening and closing movement. A normally active door is provided with a locking mechanism adapted to engage an opposite, normally inactive, door for securing the doors together. One or more flush bolt mechanism(s) is mounted on the normally inactive door for locking the door with the door frame whenever the locking mechanism on the active door is engaged with the inactive door. A control mechanism is mounted on the inactive door and interconnected with the flush bolt mechanism(s) so that whenever the active door is unlocked, the flush bolt mechanism(s) is releasable in response to an opening force applied against the inactive door.

Claims41

Dependent claims

A door mounted for movement between open and closed positions with respect to a door frame, comprising:

latch means on said door movable between a latched position engaging said frame for securing said door in said closed position and an unlatched position disengaged from said frame permitting movement of said door toward said open position;
and
control means remote from said latch means for controlling the same to prevent disengagement from said frame in response to opening force applied to said door when said control means is in a first condition and to permit said latch means to move to said unlatched position, disengaged from said frame in response to opening force applied to said door when said control means is in a second condition, said control means including means normally biasing said latch means toward said unlatched position.

A pair of first and second doors mounted for movement between open and closed positions with respect to a door frame, said doors having lock stiles in closely adjacent positions when said doors are in a closed position, comprising:

latch means on said first door movable between a latched position engaging said frame for securing said first door in said closed position and an unlatched position disengaged from said frame permitting movement of said first door toward said open position;
control means remote from said latch means for controlling the same to prevent disengagement from said frame in response to opening force applied to said first door when said control means is in a first condition and to permit said latch means to move to said unlatched position, disengaged from said frame in response to opening force applied to said first door when said control means is in a second condition, and
said control means including a manually operated element on said second door movable toward and away from said first door between a locking position for preventing said latch means from moving to said unlatched position when said doors are closed and an unlocked position permitting said latch means to move toward said unlatched position for opening at least one of said doors.

Dependencies are inferred from the claim text.

Safety flush bolt entrance door system

Life of this patent

Safety flush bolt entrance door system

Life of this patent

Abstract

Claims41