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:
Nov. 18, 1980
Filed:
Nov. 22, 1978
Robert L Dauenbaugh, Rockford, IL (US);
Keystone Consolidated Industries, Inc., Peoria, IL (US);
Abstract
A changeable combination, axial pin tumbler lock is operable by means of a cylindrical service key. Set keys are used to change the tumbler combination and thereby provide for operation of the lock by a different service key. The lock includes a fixed cylindrical barrel with twelve tumbler passages in opposed relation with a rotatable plug and barrel having seven tumbler passages. One half of the passages of the fixed barrel store reserve tumblers. A single shear interface is defined by the plug barrel and fixed barrel. Transfer of reserve tumblers from the fixed barrel passages to the plug barrel passages by means of set keys effects a combination change.