US2294495A - Lock - Google Patents

Description

Sept. 1, 1942. c. WOO-DRUFF 294, 95

LOCK

Filed Aug. 28, 1940 Patented Sept. 1, 1942 LOOK Carro'll -VIloo'drufit', -Joliet, 111., assignor .of. onetcnthto ErnestiRadtke and Adele:Radtke,-:zfive .apemoent itfl a Erank. Kraemer, five; per cent ,to

I R. 5B ,Waqgllr. five per cent -,totDwight-- Gordon,

;-and zthirtyethree and one-third per .oent..to Dring Harper, Chicago, Ill.

-Application. August 28, 1940, Serial No. 354,607

4 Claims.

This invention pertains-to locks,'and more particularly to those utilizinga cylinder and a plura-lityof tumblersor pins.

' -In-the present formsof cylinder-and pin locks, there are usually two cylinders and aplurality "of pins which are normally spring-pressedinto bores which extend through into "the keyway. The pins are made each in two sections, sowhen theproper key is insertedthe breaks between the upper'andlowersecti ons coincide with the line between "the stationary and revolving cylinder permittingthe latter-to revolveand the lockto open. This construction creates the disadvantage that, when a pry is used; the-pinswill bind between the stationary and revolving'cylinder and, by ,utilizing a-pick, the breaks can "be gotten into position so the lock will open. I realize that the lock art has long engaged-the'rattention of experts but, sofaras 'I'amaware, no one has obviated theabove mentioned'disadvantageby the specific advantageous structure embodied in my invention. Y

The object of my invention is safety in looks.

Another object-isto produce a substantially unpickable lock.

A further object is to produce an easily manuiactured and readily operated lock for accomplishing the above results.

These and other objects may be accomplished by my invention which embodies among its features a lock having a stationary cylinder, Ia rotatable or looking cylinder therein, a second or key cylinder concentric thereto, a plurality of bores and pins extending through from the stationary cylinder to the keyway, said pins each having a break near the line between the stationary cylinder and the locking cylinder, an additional break near the line between the locking cylinder and the key cylinder and bores extending between the locking cylinder and the key cylinder containing loose pins to provide play therebetween so the key cylinder will turn suificiently to prevent the remainder of the first mentioned pins from being displaced by the lower portions of these pins when it is so turned. Thus, no binding can be accomplished by turning the key cylinder. It is to be understood that this cylinder may be formed of a plurality of identical discs carrying the pins and bores.

These and other objects and features will become evident from the following disclosure when taken in connection with the accompanying drawing in which:

Figure 1 is a cross-section of a lock embodying my invention,

Figure 2 :is a cross-section'taken on .line; 2-2 of Figure-1,

Figure -3 is "the -"device shown in Figure :2 :but with-the :key cylinder turned, 5 Figure lisan exploded view, in perspective, of

r the discs forming a the key cylinder, and,

-Figure 5 I is ea perspective view of the ;discs shown inFigure 4 assembled into the locking cylinder.

Referring ;;tothe drawing in detail, my im- -proved lockconsists ofacasing t0 which holds stationary -a cylinder H having bores I2 therethrough. Revolvably..positioned in the cylinder II-is a locking cylinderilla having bores .-I3, coinclding with bores I2 and also a corresponding numberof holes .Idrat right angles tobores I2 and :threaded to receive plugs :forla .purpose ,.to be ihereinafter described. :Revolvably held .in this locking cylindertis a'keyv cylinder .consisting ofa number .of discs JILB. .These discs'havea :keyway I6 and also have bores :I'I coinciding with bores I3 and leadingaintozkey-way I6. Thereiare also sockets 5 I8 I coinciding JWi-th bores. I4.

When theilockoislassembledthe key .cylinder consisting of the disks I5 is inserted in the looking cylinder Ila, and play pins I9 are inserted in the side bores I4, being held therein by plugs 20. The play pins I9 do not snugly fit the bores I4 and sockets I8, so as to leave a certain amount :10 of play between the disks I5 and locking cylinder Ila. The locking cylinder is inserted into the stationary cylinder, and pins, made up of three sections 2|, 22 and 23, are inserted into bores I2, I3 and I! [and held therein by springs 24. It will be noted that these pins provide a break between the locking cylinder Ila and the stationary cylinder I I, and also between the disks I5 and locking cylinder I Ia. At the latter break, pins 22 are made with rounded bottom ends and pins 23 are made with fiat top ends in order to efiectively abut the locking cylinder upon insertion of a pick, with the key cylinder sections angularly arranged so that the inner pin sections are out of alignment with the outer sections. When the locking mechanism is assembled as explained above, stationary cylinder I I is inserted into casing I0 and held therein by set screw 25. When the lock is in use, if an attempt is made to pick the lock by exerting torsional stress by rotation of the disks I5 in an attempt to bind the pin tumblers, play pin I9 will allow the disks I5 to assume the position shown in Figure 3. Then lower pin section 23 abuts cylinder I la and will prevent all manipulation of the upper pin sections 2I and 22. Since cylinder Ila is inaccessible by reason of the front of casing In, the exertion of a lifting force on the tumbler pins by the letting up method of picking is prevented and the lock is, to all intents substantially unpickable by any method which is generally known to malefactors.

When a key is inserted in keyway l6 it contacts the bottom pins 23 and causes the break between pins 2| and 22 to fall between locking cylinder Ila and stationary cylinder H, and the lock can be opened similarly to the conventional lock. Accordingly, it will be seen that I have produced an easily operated and assembled lock which is substantially unpickable. Although a preferred embodiment is disclosed herein, I do not wish to be limited thereto but only by the scope of the appended claims.

What is claimed is:

1. In a lock, a stationary cylinder, a locking cylinder rotatably held therein, a keyway cylinder formed of discs rotatably held in the locking cylinder, three sectioned pins extending from the stationary cylinder into the keyway and of such a length that, when a key is inserted, they will break between their upper and middle sec= tions and permit rotation of the locking cylinder, the lower ends of the middle sections of the pins being rounded and the upper ends of the lower sections flat so that, when the discs are turned slightly with respect to the locking cylinder the flat ends abut the cylinder and prevent manipulation of the other pin sections, and a play pin between each disc and the locking cylinder to permit limited movement within the locking cylinder.

2. In a lock of the character described, a body having a cylindrical bore, a tubular locking cylinder rotatably mounted in the said bore, a keyway cylinder rotatably fitted within the said locking cylinder, a plurality of tumbler pins slidably fitted in radial bores in the cylinders and body, each of the said pins having a plurality, of aligned sections spring pressed to normally look the cylinders and operative to release the same upon insertion of a key, and means connecting the keyway cylinder with the locking cylinder in such manner as to allow limited angular movement of the keyway cylinder.

3. In a lock of the character described, a body having a cylindrical bore, a tubular cylinder rotatably mounted in the said bore, a keyway cylinder rotatably fitted within the tubular cylinder, the said keyway cylinder being composed of a plurality of transversely divided sections, each of the said sections having a radial bore adapted for alignment with corresponding bores in the tubular cylinder and the body, a tumbler pin slidably fitted in each set of aligned bores, each of the said tumbler pins being composed of three transversely divided sections, a spring mounted in each bore in the body yieldingly forcing the tumbler pin therein to retracted position for lockall) ing the tubular cylinder against rotation in the body, the said pin being retractable upon the insertion of a key in the keyway cylinder to align breaks between the pin section for rotation of the tubular cylinder, and pins mounted in and projecting radially inward of the tubular cylinder and engaging sockets in the key cylinder sections to allow limited angular movement of the sections within the tubular cylinder.

4. In a lock of the character described, a body having a bore therein, a locking cylinder rotatably mounted in the said bore, a plurality of keyway cylinder forming sections rotatably fitted within the said locking cylinder, a plurality of tumbler pins slidably fitted in radial bores in the said cylinders and in the body, each of the said pins having a plurality of aligned sections spring pressed to normally look the cylinders and operative to release the same upon insertion of a key, and pins mounted in and projecting radially inward of the locking cylinder and engaging sockets in the keyway cylinder sections so as to allow limited angular movement of the said sections within the locking cylinder.

CARROLL WOODRUFF.

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