Access control assembly
AssigneeInternational Security Products, Inc.
InventorWalter E. Surko, Jr.
Life of this patent
Estimating the term…
Abstract
A locking device, suitable for walk-in freezer doors, automatically locks when the door is closed, allows the door to be pulled open from the outside only when a proper key is inserted and rotated 90.degree., and always allows the door to be opened from the inside by pushing on a manual actuator. The locking device includes a strike mounted on the door frame, an outside plate assembly including a rigid handle and lock cylinder, and an inside plate assembly including a bracket supporting a spring loaded bolt, an enabling mechanism in the form of a collapsible linkage coupled to the bolt, a manual actuator, and a cover.
Claims20
A lock assembly for a door, a door with which the lock assembly is to be associated being supported from a frame and having first and second oppositely disposed surfaces, said lock assembly comprising:
- handle means, said handle means being adapted for mounting on a first surface of a door;
- key operated lock means, said lock means including a drive member movable in response to key operation;
- strike means, said strike means being adapted for mounting on the frame of a door on which said handle means is mounted;
- a bolt;
- means pivotally supporting said bolt from the second surface of the door, said bolt supporting means positioning said bolt for cooperation with said strike means, said bolt supporting means including:
- bolt enabling means, said enabling means comprising linkage means, said linkage means having a rigid state and a collapsible state, said bolt being pivotally mounted on said linkage means;
- means for resiliently biasing said bolt in a first direction of rotation whereby said bolt will be extended and will engage said strike means to lock the door;
- first control means coupled to said linkage means for selectively causing said linkage means to be configured in the rigid or collapsible state without imparting motion to said bolt whereby the application of force to said bolt when said first control means has caused said linkage means to be configured in the collapsible state will permit said linkage means to collapse and said bolt to retract and disengage said strike means;
- second control means coupled to said linkage means for selectively causing said linkage means to be configured in the rigid or collapsible state without imparting motion to said bolt;
- and
- manual actuator means for causing operation of said second control means;
- and
- means for connecting said lock means drive member to said first control means whereby said lock means may control the state of said linkage means.
Dependencies are inferred from the claim text.