Mas-hamilton Group, Inc.

N T Monarch Hardware

Harold L Brooks

Thomas R Clark

Kun Hong Kim

James Wiley Overbey

Donald H Schmidt

Pamela K Phillips

A combination lock/deadbolt is connected to a push-to-open panic-bar device to operate in response to push-bar operation, thereby withdrawing both the push-bar latchbolt and the deadbolt permitting instantaneous and unrestricted egress from a secured area. To maintain the security of the area from unauthorized entry from outside the secured area, a connection between the push-to-open device and the combination lock/deadbolt assembly is implemented with a lost motion connection. The lost motion device, preferably is a flexible cable transmitting force only in tension, assures that any operation of the combination lock/deadbolt will not effect the security provided by the push-to-open device. Further, the push-to-open device may be provided both with a conventional key cylinder lock and a knob, ever, or thumb lever release on the door exterior. Opening action initiated from outside the door through the knob lever or thumb lever release is mechanically segregated from the cable connection to the combination lock/deadbolt, preventing operation of the push-to-open device from the outside causing operation of the combination lock/deadbolt assembly. Accordingly, an authorized individual must have both a key for the key cylinder lock and the authorized combination for the combination lock in order to gain entry to the secured area, yet anyone may exit the secured area without any restrictions or delay merely by pushing the push-to-open bar.

High security push-to-exit pedestrian door control

A combination lock/deadbolt assembly connection technique is disclosed for connecting the bolt of the combination lock to the deadbolt of the deadbolt assembly to provide a lost motion connection while at the same time to retain the ability to position a magnetic anti-attack interlock within the bolt of the combination lock. A connecting shaft is disposed between the bolt and the deadbolt and a spring bias force introduced between the two bolts. The shaft may be attached rigidly at one end to either the lock bolt or deadbolt. The opposite end is loosely attached by retaining rings or retaining rings to accommodate the movement of the loosely attached bolt with respect to the shaft thereby providing a lost motion connection. A compression spring is disposed intermediate to the lock bolt and the deadbolt to provide a separating or extending force. The connection constitutes a lost motion connection to permit either the withdrawal of the deadbolt without withdrawal of the lock bolt or extension of the lock bolt without requiring extension of the deadbolt.

Lock bolt and deadbolt interconnection mechanism

Electronic combination lock housing

Growing community of inventors

Lexington, KY, United States of America

Harold L Brooks