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Publication numberUS3713311 A
Publication typeGrant
Publication dateJan 30, 1973
Filing dateMay 28, 1971
Priority dateMay 28, 1971
Publication numberUS 3713311 A, US 3713311A, US-A-3713311, US3713311 A, US3713311A
InventorsOliver R, Spain R
Original AssigneeOliver R, Spain R
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Detachably fixed cylinder lock core
US 3713311 A
Abstract
A cylinder lock core mechanism for insertion into and becoming detachably fixed to a lock housing under control of a special key operating upon a special tumbler in the key plug, the core being retained by a slidable retaining lug emerging through the surface of the core and being retractable by operation of the special key's rotation to cause the tumbler to coact with the retaining lug permitting the core to be withdrawn from the housing - including a deadlock member coacting with the retaining lug under control of the key plug and guiding studs in the core structure whereby the member is cammed to free the retainer for movement only upon rotation of the key plug by the special key.
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United States Patent 91 Oliver et al.

[ 1 Jan. 30, 1973 3,009,349 11/1961 Check [54] DETACHABLY FIXED CYLINDER LOCK CORE [76] inventors: Roy N. Oliver, 148 Ellen Drive; Roy C. Spain, P.O. Box 1668, both of Salem, Va. 24153 221 Filed: Mag/28,1971 211 Appl.No.: 147,843

[52] US. Cl. 170/369 [5 1] Int. Cl. ..E05b 35/14 [58] Field of Search ..70/369, 367, 368, 370, 371, 70/451 [56] References Cited UNITED STATES PATENTS 2,122,478 7/1938 Liss ..70/369 2,457,650 12/1948 Dysan.... ..70/369 X Primary Examiner-Robert 1;. Wolfe Attorney-John B. Sponsler [57] ABSTRACT A cylinder lock core mechanism for insertion into and becoming detachably fixed to a lock housing under control of a special key operating upon a special tumbler in thekey plug, the core being retained by a slidable retaining lug emerging through the surface of the core and being retractable by operation of the special keys rotation to cause the tumbler to coact with the retaining lug permitting the core to be withdrawn from the housing including a deadlock member coacting with the retaining lug under control of the key plug and guiding studs in the core structure whereby the member is cammed to free the retainerfor movement only upon rotation of the key plug by the special key.

3 Claims, 5 Drawing Figures mimmm so Ian sum 2 or 2 DETACIIABLY FIXED CYLINDER LOCK CORE BACKGROUND OF THE INVENTION Conventional cylinder locks carried by doors and the like frequently are required to be changed for security purposes, or for changing combinations; consequently, it is desirable to have an arrangement whereby the lock core may be removed without taking out the lock housing. This has brought about the so called removable core" type of lock similar to that illustrated in U.S. Pat. No. l,964,787 wherein a special key operating upon a special tumbler coacts with the mechanism to permit the lock core' to be removed from its housing for replacement.

As also shown in U.S. Pat. Nos. 1,986,676 and 2,122,478 the mechanism normally involved is essentially a latch or cam extending from the core into a cavity of the housing under control of the key plug's rotation in combination with a special key fitted to the plug.

SUMMARY OF THE INVENTION The present invention relates to an improved type of removable core having a positive and simplified mechanism for detachably fixing the lock core in the lock housing with the further improvement of a deadlatch mechanism whereby the lock can not be picked readily by rapping or the like. More specifically, a sliding type of core retainer, or latch, is provided to emerge from the core to engage the lock housing and an auxiliary member coupled to the retainer is positively confined to a position between the key plug and the core structure until the key plug is rotated thereby holding the retainer in locked position in the housing.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the removable core and the lock housing into which it is detachably fixed.

FIG. 2 is a sectional view of the mechanism within the core which is key operated to provide for the emerging of the core retainer into the lock housing.

FIG. 3 illustrates thefunctioning of the mechanism of FIG. 2 in order to withdraw the core retainer from the lock housing.

FIG. 4 is a detailed perspective of the principal structure of the retainer and its auxiliary member coupled thereto.

FIG. 5 is a sectional view taken longitudinally of the core structure to illustrate the action of the key and key plug in cooperation with both the actual locking tumblers and the special tumbler for controlling the core retaining mechanism.

DETAILED DESCRIPTION Referring to FIG. 1 a cylindrical lock housing is provided with an hour-glass shaped opening into which a lock core ll may be inserted axially under control of a key I2 and a key plug 13 to cause .a retainer lug 14a to engage a recessed portion within the lock housing 10. As shown in FIG. I a rotation of the key 12 clockwise will cause the lug 14a to emerge from the core II and a counter-clockwise rotation of the key will cause the lug to be retracted into the core. Obviously when the lug 14a has emerged from the core 11 and has entered the housing 10 recesses portion the core can not be removed.

Referring now to FIG. 2, which is a sectional view taken transversely through the core 11 (when it has been inserted into the housing 10) just forward of the lug 14a, it is to be noted that the lug is in its emerged position with the recessed portion 10a of the housing 10. Attention is also invited to FIG. 4 to understand the internal structure of the core 11, which consists of the retainer 14 having having the lug 14a at one end and having a pin 14b at the opposite end loosely joined to a T-shaped member 15. When the core 11 is in its retained position, therefore, as shown in FIG. 2, the retainer 14 is confined by some studs 16 and 17 at its upper edge and by the key plug 13 at its lower extremeties. However, since the retainer 14 is pinned to the member 15, which is rigidly held between the stud l7 and the key plug 13, the core 11 remains firmly .in its retained position. In other words, the member 15 provides a deadlatch against random displacement of the retainer 14. 4

Reference is now made to FIGS. 2, 3 and 5. It is well known in the prior art to use a special key, such as key 12 having an extra tip 12a for coacting with a special tumbler such as tumbler 18, wherein the special key also operates the normally operative lock tumblers, such as the tumblers 22 and their risers 21 (See FIG. 5) to lock and unlock the mechanism. The tip 12a in the present invention functions to cause the special tumbler 18 to be cammed out of the key plug 13 (See FIG. 2) so that rotation of the key 12 (counter-clockwise as in FIG. 2 and FIG.3) causes the tumbler 18 to move against the toe of retainer 14, which via the pin 14b pullsthe member 15 to be cammed downward by the stud 17 as rotation of the key plug 13 permits the free end of member 15 to enter the cavity 13a in the key plug 13 (See FIG. 3) so that the lug 14a is withdrawn from the recessed portion 10a of the housing 10, and the core 11 can then be withdrawn from the housing.

To replace the core 11 into the housing 10 a reverse procedure is followed, the key being rotated clockwise whereby the retainer 14 is slided to the right (as viewed in FIG. 2) and the lug 14a again emerges from the core 11 and slide into the recessed portion 10a.

The key normally used to lock and unlock" the lock does not have an extra tip such as the tip 12a, and under some conditions as the key plug 13 is turned the lower end of member 15 may begin to enter the cavity however, such action will not move the retainer 14 without a positive movement of tumbler l8 (e.g., per

key tip 12a), a detent 23 may be provided tov retain' member 15 normally in the position shown by FIG. 2. Similarly, a spring (not shown) may be provided to retain tumbler I8 normally seated in the key plug 13,

permitting the tumbler 18 to emerge only when cammed by the key tip 120.

A unique feature of the invention resides in the combination of the retainer 14 and the member 15 wherein the former is positively locked into the housing 10 by its coupling with member 15 which is confined between the stud 17 and the key plug 13 so that rapping, or other vibrations tending to release the retainer lug 14a from the recessed portion 10a, has no effect in reducing the security of the lock.

What is claimed:

1. A cylinder lock core capable of being detachably fixed within a lock housing comprising a key plug, a slidable retainer for engaging a recessed portion of said housing, said retainer being constrained within said core by a pair of guiding studs and said key plug, a tumbler within said key plug capable of being displaced by introduction of a key into said plug to engage and move said retainer upon rotation of said key, and a member coupled to said retainer for locking positively said retainer against random movement.

2. The invention claimed in claim 1 wherein said

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2122478 *Sep 9, 1935Jul 5, 1938Helen B HamillLock
US2457650 *Feb 19, 1946Dec 28, 1948American Hardware CorpLock
US3009349 *Apr 14, 1959Nov 21, 1961Yale & Towne Mfg CoRemovable core lock
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4444034 *Jul 16, 1981Apr 24, 1984Best Lock CorporationPull-resistant lock core
US4763428 *Nov 6, 1985Aug 16, 1988Fischer Joey GLockable security picture frame
US5421179 *Feb 24, 1993Jun 6, 1995Assa AbCylinder lock provided with an exchangeable lock-cylinder
US5681259 *Jan 5, 1996Oct 28, 1997Healing Environments International, Inc.Method and apparatus for biophilically promoting patient relaxation, for reducing physical and/or psychological patient stress and for expediting patient recovery
US5934124 *Aug 27, 1996Aug 10, 1999Kabushiki Kaisha Tokai Rika Denki SeisakushoCylinder lock
US5964110 *Nov 12, 1997Oct 12, 1999The Eastern CompanyKey lock with removable plug
US5970760 *Jan 11, 1999Oct 26, 1999Shen; Mu-LinLock core-changeable type auxiliary lock with improved pull-resistant structure
US6035673 *Oct 14, 1998Mar 14, 2000Kenstan Lock CompanySliding door lock with a key removable core
US6382006 *Mar 29, 2000May 7, 2002Medeco Security Lock, Inc.Removable cylindrical lock core
US6578396May 6, 2002Jun 17, 2003Medeco Security Locks, Inc.Removable cylindrical lock core
US6718807 *Jul 18, 2002Apr 13, 2004Assa AbLock device with removable core
US6979029Dec 10, 2003Dec 27, 2005Shen Mu-LinLock with increased torque-resisting capacity
US7845202 *Sep 22, 2006Dec 7, 2010Assa Abloy AbInterchangeable electromechanical lock core
US7874190Jun 22, 2004Jan 25, 2011Assa Abloy AbElectromechanical lock cylinder
US8028553Jun 15, 2006Oct 4, 2011Assa Abloy AbModular electromechanical lock cylinder
Classifications
U.S. Classification70/369
International ClassificationE05B9/08, E05B9/00, E05B27/00
Cooperative ClassificationE05B9/084, E05B9/086
European ClassificationE05B9/08C, E05B9/08C2
Legal Events
DateCodeEventDescription
Feb 2, 1984AS02Assignment of assignor's interest
Owner name: MECHANICAL DEVELOPMENT COMPANY, INC.
Owner name: MEDCO SECURITY LOCK, INC., P.O. BOX 1075, SALEM, V
Effective date: 19840126
Owner name: OLIVER ROY N.
Feb 2, 1984ASAssignment
Owner name: MEDCO SECURITY LOCK, INC., P.O. BOX 1075, SALEM, V
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:OLIVER ROY N.;MECHANICAL DEVELOPMENT COMPANY, INC.;REEL/FRAME:004220/0613
Effective date: 19840126