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. 15, 1977
Filed:
Dec. 18, 1975
George P Patriquin, Gardner, MA (US);
Hudson Lock, Inc., Hudson, MA (US);
Abstract
A security apparatus including a cylinder lock with an actuator plug rotatably mounted within a hollow cylindrical housing. Retained by the actuator plug are a plurality of locking wafers that are spring biased into a locking spline formed in the inner surface of the housing so as to retain the plug in a locked station. Also retained by the plug is a directional wafer, spring biased in a primary position wherein it permits both clockwise and counterclockwise rotation of the plug from the locked station and movable into either intermediate or auxiliary positions wherein it allows clockwise rotation but prevents counterclockwise rotation of the plug. A control key is bitted so as to pull the locking wafers into shear positions and to draw the directional wafer into its intermediate position permitting rotation of the plug to a second station. Also defined by the housing is a tumbler stop that establishes a third operational station located between the locked station and the second station. The tumbler stop is engaged by the directional wafer when in its auxiliary position so as to prevent clockwise rotation of the actuator plug beyond the third station but it is not engaged with the directional wafer in either of its primary or intermediate positions which allow continued clockwise rotation of the plug to the second station. Another control key bitted so as to pull the locking wafers to shear positions and draw the directional wafer into its auxiliary position permits clockwise rotation of the plug to the third station only where the directional wafer contacts the tumbler stop.