Schlage Lock Company LLC

King Saud University

Khurshid A Qureshi

Ilia D Petkov

Bruce P Eagan

William S Massey

Rocco A Carestia

Nasir Uddin

Joseph G Matulich

A modular return spring cage assembly for door lock handles, consists of a door lock mounting chassis member having two opposed faces, at least one face having two opposed arcuate channels forming a circular groove in the face. The groove has two split diametrically opposed spring bases each formed by two substantially equal spring stops projecting from radially outer and radially inner walls of the groove. Two compression springs are slidably disposed within the channels and have length such that a slight compression is required to fit the springs between the split spring bases. An arrangement for transmitting torsional motion between a door handle and the springs, and for limiting rotary motion of the handle is included. A provision for positively retaining the springs and the torsional motion transmission arrangement on the mounting chassis member completes the modular assembly. When so assembled, the spring cage module can be easily installed in or removed from a door preparation; and, because of its modularity, it may be designed to be reversible to provide enhanced tamper resistance.

Door handle modular return spring cage assembly

A locking device is disclosed, comprising a locking mechanism having a locked position and an unlocked position, a hollow plunger member having a central axis, the hollow plunger member being engaged with the locking mechanism to move the locking mechanism alternatively into the locked and unlocked positions upon reciprocating linear motion of the hollow plunger member in first and second directions along its central axis, and a motor having a shaft disposed coaxial with the central axis of the hollow plunger member is disclosed. In one embodiment, the locking device further comprises a spring having first and second ends, the first end being fixed to the motor shaft, and a pin fixed to the hollow plunger member for engaging the second end of the spring such that when the motor shaft rotates in a third direction the hollow plunger member moves in the first direction and when the motor shaft rotates in a fourth direction the hollow plunger member moves in the second direction. In another embodiment, the locking device further comprises a threaded member disposed on the motor shaft and a threaded surface disposed at an interior of the hollow plunger member to engage the threaded member such that when the motor shaft rotates in a third direction the hollow plunger member moves in the first direction and when the motor shaft rotates in a fourth direction the hollow plunger member moves in the second direction.

Locking device

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Colorado Springs, CO, United States of America

Khurshid A Qureshi