US1135998A - Cylinder-lock. - Google Patents

Description

'E. EPSTEINQ Y QYLINDER LOCK..

APPLICATION FILED NOV. 5. 1914.

Patented Apr; 20', 1915.

and has for its object to provlde a novel conmasses.

T all whom it may concern:

Be it known that I, ELI- EPSTEIN, a subject of the Czar of Russia, residing, at Boston, county of .Sufiolk, State of Massachusetts, have invented an Improvement in Cylinder-Locks, of which thefollowing description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to cylinder locks struction by which thecylinder is locked into the barrelin such a way'that it cannot be removed after the parts are once assembled withoutfdestroying the lock. In the cylinder look as usually madetheh cylinder can be removed from the barrel comparatively easily aftetr the multi-par't tumbler pins have been lined'np, a'ndan expert locksmith can readily line up the tumbler pinseven though he has not a key by giving the lock jarring blows. This fact opens the way for unauthorized persons to secure improperly a du-' plicate key of the lock, for the making of the duplicatekey' involves simply removlng the cylinder from the lock andthen filing a key to fit the tumblersof the lock, after which the cylinder can be placed back in the look.

again. My invention obviates the possibility of this being done-by providing a construction which prevents the cylinder from being removed from the barrel after the parts haveonce been assembled. With my improvements it is impossible for any person to make a duplicate key except/from the original key. The construction also has the advantage that it renders the lock non-pickable. r

In order to'give anunderstanding of my invention T have illustrated in the drawings a selected embodiment thereof which will now be described, after which the novel. features will be pointed. out in the appended claim. g v

Figural is a vertical sectional view ofa duplex cylinder lock "on substantially the line a;-m, Fig; 2; Fig. 2 is a sectional View on the line y-' y, Fig. 1; Fig. 3 is a perspective view of the cylinder removed; Fig. 4 is a perspective view of the locking ring.

The lock herein shown comprises the usual casing or barrel 1 having a bore to receive the cylinder 2 which is provided with the usual key slot 3. 9

4: represents the usual rnnlti-part tumbler pins which are received in apertures formed Specification of Letters Patent. Patented Apr. 2t),- 1915. Application filed November 5, 1914. Serial No. 870,337.

in the barrel and cylinder, respectively, said pins being acted uponby springs 6. The parts thus far described are such as r are commonly found in cylinder locks and form no part'of my present invention.

In order to lock thecylinder in the barrel so as to prevent the possibility of its being removed under any circumstances, I have. herein prov1ded the cylinder with a groove 7' and have provided the bore in the barrel with a mating groove 8, and have also provided a split locking ring 9 which is adapted to be received in said grooves thereby to lock the cylinder in the barrel. The groove is deep enough and the locking ring 9 is a spring ring so that in assembling the parts the ring 9 can be placed into the groove 7 and then compressed to permit the cylinder to be inserted into the barrel. When the cylinder is in place the groove 7 is opposite the groove 8 and the resiliency of the ring 9 will cause it to spring out into the groove 8 so that the ring will be normally situated partly in the groove 8 and partly in the groove 7. Bythis means the cylinder is positively locked in the barrel and cannot be removed therefrom. This locking means is independent from the tumbler pins 4 so that even when the tumbler pins are lined up the cylinder is still locked in the barrel. The gap or opening 10 in the sp'litring 9 is of su-fiicient width to receive'the key 11, and in assembling the parts it is essential that the ring 9 should be so positioned that the space .10 will come in alinement with the key slot.

This is necessary in order to permit the key to be inserted into the slot in order that the locking ring 9 may not .form an obstruction to the entrance of the key into the cylinder 3. When the key is inserted and the cylinder is turned by the-,key,the engagement of the back of the key with the ends of the ring 9 will turn the ring with the cylinder, and as the key cannot be withdrawn except when it is in the position'shown in Fig. 2, it will be obvious that whenever the key is removed.

from the lock the locking ring 9 will always be left with the gap or space 10 therein in alinement with the key slot.

' With my invention it is impossible for any person to remove the cylinder from the lock for the purpose of making a key to fit the cylinder or for any other purpose. The lock will thus be of use only so long as the original keys are available and when these have become lost or broken a new look will be wmed: w t z key fslot grpoye 'tlir iement 'wflth'jthe lock byginserting a linloeked position as they In-fsl 'cylinde 1oek;-tbeeombinatioe with a bail-rel havipg e nulan gtooveintermediate ofits'ends, of a s 3 I I Witnessesf; and a peripheral groovein said cylindery operetingf in said bore and pro 10 re'ipreyided with an 211 b0pe, tumb1er pins carried by the cylinder 5 locking ring received in said grooves 'and leckim the eylinder in 'pesitioh, the space or gap between tlieends 0f the split ring being in alinement with the key slot of the cylinder. 20

,ELI EPSTEIN.

H LOUIS GSA/Lint, v

THOMAS JJD UMM ND.

In testimony whereof, .I haye slgned my s name to this specifieation, in the presence of -.'two' subscribing witnesses.

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