RE 30,198 and for example may be the one and one-half inch diameter solid brass Medeco rim cylinder commercially available from Medeco Security Locks, Inc.
Each of these locking cylinders or cylinder locks are of the type described in U.S. That is, there is an outside locking cylinder 18 and an inside locking cylinder 20. Each of the cylinder assemblies includes a locking cylinder. There is an outside locking cylinder assembly 14 and an inside locking cylinder assembly 16 which in normal use sandwich a door (not shown) between them. The deadbolt assembly includes a deadbolt 12 slidable from a retacted position to a locking position. Such double cylinder deadbolt is also commercially available from Medeco Security Locks, Inc., Salem, Virginia. 8, 1979 and reference can be had to such prior disclosure for components not fully disclosed herein. This alleviates the fire and panic danger objection to the usual double cylinder deadbolt because one canot inadvertently or surrepticiously remove the inside key.Ī double cylinder lock deadbolt assembly is constructed generally in accordance with my prior application, Ser. This would allow the inside key to be removed only when the possessor of the outside key purposely desires to do so, e.g., when leaving a home for vacation or the like. However, if the inside key can be positively retained by a lock and only removed when the outside key is in the lock and is actuated to release the inside key. Even though the invention of that application has been a significant commercial success, it still does not meet some of the objections from a fire safety standpoint in that the inside key might be removed inadvertently thus barring exit in the case of fire or panic. In that invention, I utilized the concept of a removable key/thumbturn. The problem of security on one hand and fire safety on the other hand in connection with double cylinder deadbolts has previously been addressed in my prior patent application, Ser.
230000000717 retained Effects 0.000 title claims abstract description 16.Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Oliver Ronald N filed Critical Oliver Ronald N Priority to US06/139,523 priority Critical patent/US4315420A/en Application granted granted Critical Publication of US4315420A publication Critical patent/US4315420A/en Assigned to MEDECO SECURITY LOCKS, INC. Original Assignee Oliver Ronald N Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Oliver Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/139,523 Inventor Ronald N.
#Double key deadbolt pdf
Google Patents Retained key double cylinder deadboltĭownload PDF Info Publication number US4315420A US4315420A US06/139,523 US13952380A US4315420A US 4315420 A US4315420 A US 4315420A US 13952380 A US13952380 A US 13952380A US 4315420 A US4315420 A US 4315420A Authority US United States Prior art keywords cylinder key outside locking deadbolt Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4315420A - Retained key double cylinder deadbolt US4315420A - Retained key double cylinder deadbolt
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