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Publication numberUS2375682 A
Publication typeGrant
Publication dateMay 8, 1945
Filing dateApr 8, 1943
Priority dateApr 8, 1943
Publication numberUS 2375682 A, US 2375682A, US-A-2375682, US2375682 A, US2375682A
InventorsOlson Philip W
Original AssigneeOlson Philip W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Cylinder lock
US 2375682 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


Filed April 8, 1943 n W PW y Y. a

PW 11/. azs BY Patented May 8, 1945 UNITED STATES PATENT OFFICE, h g 2,375,682

. CYLINDER were Phillip W. Olson, Chicago, 111.. Application April s, 1943, Serial No. 482,346

2 Claims. This invention relates in general to looks and more particularly to a tumbler type cylinder lock highly resistant to .picking.

So-called pick-proof locks prior to this invention usually were dependent upon a large number of tumblers or other complicated means i for their securityiand resistance to picking, which construction is expensive, whereas the novel construction of the present invention includes simple means whereby the use of relatively few tumblers and correspondingly low manufactuing cost provide ample security and high degree ofresistance to picking.

Ihe principal object of the invention is to provide a tumbler lock including a plurality of relatively few detent-controlled tumblers.

A further object of the invention is the provision of a cylinder lock having detent-controlled.

i 9 Further object and advantages of the invention will be apparent inone embodiment hereinafter described, in which: 7

Fig. 1 is a side elevation of the lock assembly. Fig. 2 is a typical key for operating the lock shown Fig. 1. i

Fig, 3 is an enlarged cross-sectional view of the lock taken through section lines 33, Fig. 1.

Fig. 4 is. an enlarged cross-sectional View of the key takenthrough section lines 4-4, Fig. 2.

Fig. 5 is an enlarged perspective view of the tumbler elements of the lock.

Fig. 6 is an enlarged cross-sectional elevation of the lock taken through section lines 6-6, Fig. 3 and showing the key in proper relation to the For the purpose of illustration, the type lock shown anddescribed is for the use of a key having unrelated serpentine grooves in its oppo-. site sides, and although this showing is a preferred construction, it will appear from the following description that locks for other type keys are equally applicable. i

Referring to Fig. 1, the barrel or housing I serves to retain the elements of the lock. .A cap 2 closely fitted over the barrel contains the keyhole. A conventional bolt 3 is integrally secured to the rotatable cylinder 4 and is adapted to engage a strike plate, not shown.

Referring to Figs. 2 and 4, the key 5 is provided with a rectangular shank 6 having unrelated sernormally would unlock the bolt 3 from a strike pentine grooves l in each side thereof. The barrel I has in'its inside periphery, two pair of oppositely disposed grooves 8 running parallel to its axis.

A cylinder 4 is constructed of two half sections and held together by means of two snap rings 9 fitting in appropriate grooves in each end of thefcylinder, shown in Fig. 6. The cylinder is adapted to rotate freely within the barrel l. A cylindrical projection ll! of the cylinder extends through a bearing ring I l which is retained in proper position by a snap ring 12. The bolt 3 is integrally attached to the end of the projection t In for locking purposes.

Referring to Fig. 5, each tumbler I3 is provided with a detent projection l4 and a key follower 15 positioned opposite the detent. The key follower in each tumbler is positioned to correspond with a predetermined formation of the serpentine grooves I in the keypthe action of which will be hereinafter described. Each tumbler is placed in its corresponding slot IS in the cylinder 4 which extends through the cylinder at right angles to the axis of rotationof the cylinder.

A detent plunger IT having a Pointed end and a spring IB are retained in the cylinder in an appropriate hole IS. The pointed end of the plunger is adapted to slidably engage the detentv projection M of each corresponding tumbler.

It is now apparent from Fig. 3 that each tumbler is capable of reciprocable movement in its slot l6 and that the plunger I! will urge the tumblerv in either direction depending upon its initial movement over the central point of the projection.

In operation and assuming that the key followers l5 have been positioned to suit a corresponding key, it will be seen from Fig. 6 that one end of each tumbler will engage a groove 8 and thus prevent the cylinder 4 from turning in the barrel 1. When the key shown in Fig. 6 is inserted, the lateral surfaces of the serpentine groove 1 will engage the key followers l5 and Withdraw each tumbler a predetermined distance to free its end from the grooves 8 and thus enable the key to turn the cylinder 4 within the barrel I, which plate.

The usual practice of picking locks i dependent upon either vibrating or moving the tumblers and disengaging their ends from locking grooves. In the present invention any attempt at moving the tumblers to predetermined positions would be defeated by virtue of the detent action previously described, as it can easily be i seen if a particular tumbler is withdrawn sufficiently far to disengage one of its ends from the cylinder groove and the plunger l1 reaches the peak of the projection M of the tumbler, the plunger, urged by spring l8, will throw the tumbler in the opposite direction and thus engage the opposite end of the tumbler in the groove of the cylinder. Therefore, any attempt to operate or pick even a small plurality of tumblers without a key is impractical if not impossible.

Although the lock described herein shows three tumblers, it is to be understood that a smaller or larger number of tumbler may be used without departing from the scope of the invention.

Having described my invention, I claim: 1. A cylinder lock comprising a casing having a'key-operable rotatable cylinder afiixed therein, said casing having a plurality of tumbler slots therein, a plurality of key-operable tumblers slidslots, each'said tumbler provided with an integral detent projection, spring-actuated detent means for normally and independently engaging said therein, a plurality of key-operable tumblers slidably retained in saidcylinder, each end of said tumblers adapted to engage corresponding said bler in a corresponding said slot to lock said cyl-- inder to said casing.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2687639 *Jun 3, 1948Aug 31, 1954Swanson Gunnar ECylinder lock and key
US2890582 *Oct 28, 1954Jun 16, 1959Eugene M NavarroLock mechanism
US3035433 *Oct 30, 1959May 22, 1962Eagle Lock CorpLock mechanism
US3058336 *Apr 12, 1960Oct 16, 1962Dante Tocchetto VirgilioLocks
US3509749 *Apr 13, 1964May 5, 1970Duncan Ind IncLock
US5826451 *Jun 30, 1995Oct 27, 1998Bacoz Developments Pty Ltd.Key operable locking mechanism
US5956986 *Dec 11, 1995Sep 28, 1999R. Berchtold A.G.Locking device with a cylinder lock and a flat key
US6105404 *Jun 30, 1998Aug 22, 2000Medeco Security Locks, Inc.Squiggle keys and cylinder locks for squiggle keys
US7370502 *Jan 17, 2003May 13, 2008Winloc AgHigh security lock and key blade combination
US7392677 *Jan 23, 2007Jul 1, 2008Porter Lock Co., Ltd.Lock core structure
US7621163Apr 22, 2008Nov 24, 2009Winloc AgHigh security key blade and key
US8689596 *Sep 21, 2005Apr 8, 2014Kabushiki Kaisha Tokai Rika Denki SeisakushoKey and lock
US9127480 *Oct 30, 2009Sep 8, 2015Schlage Lock Company LlcLock cylinder and key combination
US20050172688 *Jan 17, 2003Aug 11, 2005Bo WidenHigh security lock and key blade combination
US20080173051 *Jan 23, 2007Jul 24, 2008Porter Lock Co., Ltd.Lock core structure
US20090019904 *Sep 21, 2005Jan 22, 2009Kabushiki Kaisha Tokai Rika Denki SeisakushoKey and lock
US20090293564 *Jun 5, 2007Dec 3, 2009Cisa S.P.A.Lock and Associated Key
US20120240645 *Oct 30, 2009Sep 27, 2012Schlage Lock Company LlcLock cylinder and key combination
US20150184422 *Dec 26, 2013Jul 2, 2015Yun-Hsiang ChangLock core structure
DE1049269B *May 5, 1953Jan 22, 1959Mefina SaZylinderschloss
EP0879927A1 *May 19, 1998Nov 25, 1998Valeo Securite HabitacleCar mounted plate tumbler cylinder lock comprising an improved sidebar
WO1996001354A1 *Jun 30, 1995Jan 18, 1996Brian Arthur CookA key operable locking mechanism
WO2011104004A1 *Feb 23, 2011Sep 1, 2011Valeo Securite HabitacleDevice for a vehicle door having half-springs
U.S. Classification70/492, 70/419
International ClassificationE05B29/00, E05B29/06
Cooperative ClassificationE05B29/00
European ClassificationE05B29/00