Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2591652 A
Publication typeGrant
Publication dateApr 1, 1952
Filing dateOct 17, 1947
Priority dateOct 17, 1947
Publication numberUS 2591652 A, US 2591652A, US-A-2591652, US2591652 A, US2591652A
InventorsPeter Ziegliss
Original AssigneePeter Ziegliss
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Two-piece key
US 2591652 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 1, 1952' P. ZIEGLISS TWO-PIECE KEY Filed Oct. 17, 1947 Patented Apr. 1, 1952 UNITED STATES PATENT OFFICE TWO-PIECE KEY Peter Ziegliss, Bronx, N. Y.

Application October 17, 1947, Serial No. 780,473

(Cl. l-395) 1 Claim.

This invention relates to a lock and key arrangement and more particularly to a lock in which a separable key may be utilized, that is, a key that may be separated into two parts and the end inserted within the lock to prevent any similar key or master key from being inserted. It is understood that the remaining section of the key may be utilized to both open said lock and to remove the inserted portion of said key.

Most locks are so constructed that a key of a given pattern will open said lock. It is also true that any number of keys of similar pattern may be used to open the same lock or a master or skeleton key might be used to pick the tumblei's and open said lock. But all such known art contemplates the use of a complete key.

It is an object of this invention to utilize a key that is constructed in two parts to open a lock. and in which said key may be snapped together within the lock to form a single key pattern.

It is a further object of this invention to utilize a lock and key arrangement in which the lock may be opened by a single key pattern, but in which the key is made in two separable parts.

A still further object of this invention is to provide a two piece separable key that ts a lock, and makes said lock tamper-proof when one section of said key is inserted.

Otherobjects of this invention may be apparent by reference to the accompanying detailed description and drawings in which Fig. 1 illustrates the separable key.

Fig. 2 illustrates the lock and key.

Fig. 3 illustrates the lock with a portion of the key inserted, and

Fig. 4 illustrates the same lock and key portion with lthe remaining portion of said key.

Referring to Fig. 1 there is illustrated a separable key I0 comprised of two portions II and I 2. The portion I I has a broke nor irregular face I4 that mates with a face I5 of the portion I2. The portion II is also provided with a pair of small spring snaps or catches IB and I1. while i the portion I2 is provided with a pair of snaps or catches I8 and I9. The catches I6 and I8 are aligned to engage, while the catches I1 and I9 are aligned to engage. Referring to Fig. 2 there 1s illustrated a typical barrel lock 20, that may be opened by a solid key -2 I. The pattern of key 2| may be copied in making the key I0, thus referring to Fig. 3 we may see that when the portion II of key I 0 is inserted in the lock 20, it may be pushed in but cannot be removed. The lock 20 having a key piece II within the barrel will not permit an additional key such as 2| to be inserted. The lock 20 thus may not be opened by any key except the remaining portion I2 of key I0. Referring to Fig. 4 it is apparent that the portion I2 of key I0 may be inserted in the lock 20 and the spring snaps or catches, IB-I8 and I 1--I9 will become engaged and the key I0 becomes a single unit and as such may be utilized to open the lock 20 and likewise when portion I2 of key I0 is withdrawn from the lock 20 it will remove the portion II at the same time. The key I0 as illustrated may be cut away or made into separable portions in any manner without departing from the spirit of this invention. It is apparent that although we have i1- lustrated one embodiment of this invention we may likewise form various other types of keys in two or more portions to perform a similar master key lock arrangement. The difference in the use of the term master key being that in this instance it is the remaining portion that is removed from the lock that becomes the master key. It is also apparent that although a key may be duplicated and used by diiierent users it is quite impossible for anyone to duplicate the manner in which the key may be separated and thus the lock may be utilized by one or more persons when desirable or it may be locked by the separable key to prevent its use by other than the one holding the master key.

Various changes and modications may be made to this device without departing from the spirit of this invention and this invention shall be limited only by the appended claim.

What is claimed is:

A key for a cylinder lock having ashank made up'oi two complementary mating parts, a spring catch on each part in latching engagement to hold the two parts together, one part being adapted to be unlatched from the other part forseparate insertion in the key passageway of a cylinder lock, and the other part upon insertion in said passageway becoming latched with said one part by said spring catches for actuation of said lock and retraction of the two parts from said passageway.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,573,791 Roethlisberger Feb. 16. 1926 1,696,326 Roethlisberger Dec. 25, 1928 1,728,310 Sundel Sept. 17, 1929 1,807,540 Makranczy May 26, 1931 2,068,936 Unterberg Jan. 26, 1937 FOREIGN PATENTS Number Country Date 256,167 Italy Dec. 12. 1927

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1573791 *Apr 30, 1923Feb 16, 1926Emil RoethlisbergerCombination key
US1696326 *Apr 23, 1923Dec 25, 1928Emil RoethlisbergerMultiple-plug key
US1728310 *Sep 29, 1925Sep 17, 1929Leon LauterKeyhole plug for cylinder locks
US1807540 *May 27, 1929May 26, 1931Makranczy Theodore ASeparable key
US2068936 *Jul 18, 1933Jan 26, 1937Unterberg Albert HCylinder keyway guard
IT256167B * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3059462 *Apr 7, 1960Oct 23, 1962Yale & Towne Mfg CoConstruction key tumbler cylinder assembly
US3073146 *Nov 4, 1960Jan 15, 1963Independent Lock CoPin tumbler assembly
US3095726 *Jan 23, 1961Jul 2, 1963Schlage Lock CoPin tumbler cylinder key system
US3099151 *Jan 16, 1961Jul 30, 1963Schlage Lock CoPin tumbler cylinder key system
US3172284 *Jun 18, 1963Mar 9, 1965Yale & Towne IncConstruction lock cylinder
US3276233 *Jun 8, 1964Oct 4, 1966RussellKeyway stop
US3338078 *Feb 18, 1965Aug 29, 1967Schlage Lock CoTwo-piece key and extractor
US3408842 *Jun 28, 1967Nov 5, 1968Master Lock CoCylinder keyway slot plug and extractor
US4402201 *Nov 14, 1980Sep 6, 1983Clarence NokesSnap-off key
US4875352 *May 11, 1987Oct 24, 1989Schlage Lock CompanyConstruction keying
US5109685 *Apr 15, 1991May 5, 1992Pundra Industries LimitedControl key for extension adapter
US5950466 *Dec 12, 1997Sep 14, 1999Moen; Richard C.Keyway plug
US6272891Sep 14, 1999Aug 14, 2001Richard C. MoenKeyway plug for double-sided keyways
US6305200Sep 14, 1999Oct 23, 2001Richard C. MoenKeyway plug
US7131302 *Apr 27, 2005Nov 7, 2006James Richard WaskiewiczKeyway plug for safe deposit locks
US7552608Jun 18, 2008Jun 30, 2009Medeco Security Locks, Inc.Lock, key blank, and key of a hierarchical lock system
US7788956Aug 7, 2009Sep 7, 2010Medeco Security Locks, Inc.Lock, key blank, and key of a hierarchical lock system
US20130152352 *Feb 12, 2013Jun 20, 2013Andre HaakeMethod for Coding a Lock and a Blank for Same
DE102004033746B3 *Jul 13, 2004Apr 27, 2006Peter SchmittLock safety device for cylinder lock with closing channel has truncated part, provided with end piece, which is separate tool for removing end piece from closing channel whereby hooking element engages edge recess with end piece
WO2013030077A1 *Aug 23, 2012Mar 7, 2013Ernst KellerRotary locking cylinder and security key
U.S. Classification70/395, 70/406, 70/424
International ClassificationE05B19/00, E05B27/00
Cooperative ClassificationE05B27/00, E05B19/00
European ClassificationE05B27/00, E05B19/00