The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1993
Filed:
Dec. 23, 1991
Kevin P Waltz, Indianapolis, IN (US);
William P Dye, Indianapolis, IN (US);
Donald D Baker, Indianapolis, IN (US);
Von Duprin, Inc., Indianapolis, IN (US);
Abstract
An electromagnetic door lock assembly employs an electromagnet positioned in a frame adjacent to a door, power source for providing power to the electromagnet, and an adjustable armature assembly positioned in the door for interaction with the electromagnet. The armature assembly includes an armature plate having a front surface and a back surface opposite from the front surface, a backing plate situated adjacent to the back surface of the armature plate, a stem coupling the backing plate to the armature plate including a spring biasing the backing plate and armature plate toward each other, a mounting plate for mounting the armature assembly to a door to be locked, adjusting screws for adjustably positioning the backing plate at a fixed position with respect to the mounting plate so that the armature plate is positioned at a first position for optimum interaction with the electromagnet, the screws having elongated heads for maintaining the relative alignment between the armature plate and the mounting plate as the armature plate moves between said first position and a position contiguous to the electromagnet.