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:
Jun. 23, 1987
Filed:
Mar. 03, 1986
Paul James, Reading, PA (US);
Baldwin Hardware Corporation, Reading, PA (US);
Abstract
A mortise lock has two relatively-rotatable knob or lever-controlled spindles for independent operation from opposite sides of a door of a resiliently extending latchbolt and positively extending deadbolt, and stop buttons accessible at an edge of the door for blocking operation of the bolts from one side in a higher security state. The lock also has a safeguard effective to block a change in the state of the stop buttons to a lower-security state unless the deadbolt is first positioned at a pre-determined point between full retraction and full extension using a key. The lock is a double cylinder lock such that operation of the deadbolt from either side requires a key. The lock may be mastered such that operation of the deadbolt requires a master key while operation of the latch requires a common key. Therefore the ability to change the stop buttons is restricted.