US1462869A - Lock - Google Patents

Description

A. PRIMAK LOCK July 24,1923. I v' A 1,462,869

Fil'ed April 25 1922 @WMM ` l @c2/aff) Dn'mkz meco/MV Patented July 24, 1923.

ADAM PRMAK, OF KENOSHA, WISCONSIN.

LOCK.

Application filed April 2.5, 1922.

To all whom it may concern Be it knoivn that I, ADAM Premian, a citi- Zen of the United States, and resident of Kenosha, in the county of Kenosha and State of lVisconsin, have invented certain nevv and useful Improvements in Locks; and ldo hereby declare that the following is a full, clear, and exact description thereof. The invention relates to locks of a type having` a plurality of tumblers therein adapted to be moved from locking position by a key.

' It comprises av casing, a shackle having one of its arms rotatably secured in the 'casing and the other arm slotted to receive a tooth on a block. A plurality of alined springurged tuniblers are provided received in recesses in a cylinder to unlock the device. A key is inserted in the slotted cylinder and lifted upwardly, moving the tumblers from the recesses. This permits rotation by the key of the cylinder, which, on sufficient rotation, is arrested by additional spring urged tiimblers which are releasable by a lateral movement of the key. The release of these additional tumblers permits the Withdrawal of the cylinder in the direction of its axis. `On the withdrawal of the cylinder, the block and retaining tooth are removed, permitting `the release of the shackle.

The primary object of the invention is the provision of a vlock which is exceedingly vcomplicatedand difficult of operation for one not knowing the principle of operation. r To unlock, it isnecessary to lift the key, ro-

ltate the cylinder, lower the key, and then Withdraw the key. 'Four distinct operations :must be performed. This makes it very difficult to pick the lock. It does not suffice merely to lift or loiverA the tumblers, b'iit-a series of distinct operations must be gone through. There is no Way to ascertain `from the exterior of the lock the nature of the structure. At the same time, the'construc.- r Vtion is of such a nature as to facilitate locking and unlocking by one Who is familiar with the operation. The key is so constructed that it need be merely lifted as far as it will go in order to release the first tuniblers. The rotation ofthe. cylinder then quickly puts it in position Where the key is operative to retain the additional tiiinblers in unlocking positionl and the cylinder may be moved outwardly. The structure Works easily and Serial No. 556,396.

the locking and unlocking are accomplished in but a moment of time. y

Another object of the invention is the provision of parts adapted to retain the shackle in locked position despite the application of considerable force to the shackle.

Additional objects are simplicity of construction and ease of manufacture.

-With the above and-other objects in view, n

which Will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described and more particularly defined by the ap` pended claims, it being understood that such changes in the precise embodiment f the 'herein disclosed invention may be made as come Within the scope of the claims. i

Tn the accompanying` drawing, VI have illustrated one complete example of the physical embodiment of the present invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which: l

Figure 1'is a central, vertical, sectional elevation longitudinally through the lock, and i Figures 2, 3, 4, and 5 are cross sections thereof on the lines 2 2, 3-3, 4.-4; and

5-5, respectively, of Figure 1.

The casing 10 is provided ivith a chamber 11 adapted to receive an arm of shackle 12 having an enlarged head 13 thereon which may be moved freely through the chamber v11, retained at one end-thereof by reasoii'of the reduced diameter ofthe chamber, the casing iitting about the arm of a shackle to permit rotation 0f the arm when the device is unlocked. but to' retain the shackle" securely.

The block is provided with a pin 171r liaving a narrowed end 18 adapted to b e received in a groove 19) in cylinder 20'. whereby the cylinder and block are retained together, the cylinder fitting snugly in the.

block, but prevented from separat-ion by .received in the branch groove.

means of the pin 17. The series of upper tumblers 21 are provided in recesses in casing 10, urged downwardly by springs 22, the ends of which abut against plugs 23. Lower tumblers 2li are, also, provided, urged upwardly by springs 25. Cylinder 20, as shown in Figures 1 and 5, is provided with an additional slot 26 extending annularly about the cylinder and backwardly a short distance, as shown at 27, terminating short of the end of the cylinder, as is apparent from examination of Figure 1, in which the slot is indicated in dotted lines.

A pin 28 having a narrowed end 29, which is received in slot 26, maintains the cylinder 20 in inner position when the device is locked. The longitudinal portion of the slot, however, receives end 29 when the device is being unlocked and permits the forward movement of the cylinder. Cylinder v20 is provided with a keyhole 30 adapted to receive key 31. The inner end of the keyhole is closed by an end member 32 secured in position by a pin 33. To unlock the device, key 31 is inserted into the keyhole 30, the key being provided with a groove 34 adapted to receive a laterally projecting pin 35. This groove directs the key properly.

When the key rea-ches its innermost position, limited by shoulders 36, it is lifted upwardly, a branch groove 37 permitting upward movement of the key, pin 35 being The upward movement of the key is limited by the upper edge thereof and at its limit of movement the tumblers 21 are lifted by bits 38 so as to lie along the surface of cylinder 20.

vThe cylinder may then be rotated substantially 180. After the rotation of the cylinder for half a circle, tumblers 24 are free to enter the recesses in the cylinder. They are ejected by a downward movement of key 31, the bits 38 contacting with the tumblers. In this position, narrowed end 29 is in registry with the longitudinal part of slot 26 so that the key may be moved outwardly drawing the cylinder with it, the limit of movement of the cylinder being determined bythe dimension of the slot. The outward movement of the cylinder carries, also, block 16 and tooth 15, which releases shackle 12 permitting it to move outwardly to unlocked position.

To again lock the device, the shackle is moved substantially to the position shown in Figure l 4and the key and cylinder are moved inwardly carrying blo-ck 16 therewith. Bits 38 are urged downwardly to expel tumblers 24 which are urged into the. recesses in the cylinder 20. The rotation of the cylinder by the key permits tumblers 21 to be again reinserted into the recesses in the cylinder, so that the parts are entirely in locking position.

It will be apparent, therefore, that the device is exceedingly diiiicult to operate to one not knowing the principle of operation thereof, but that it may be operated easily and quickly by one familiar with its working.

I claim 1. The combination of a casing, a shackle pivoted thereto and having a transversely slotted locking end, said casing having an opening to receive the locking end of said shackle, a series of slidable spring urged tumblers within said casing, a cylinder provide-d with a key slot and a series of apertures adapted to receive said tumblers, said cylinder being rotatably mounted within said casing, a slidable block operably coupled to said cylinder and having a tooth adapted to enter the slot in the locking end of said shackle, and a key .adapted to enter the slot within said cylinder and to press the tumblers outwardly from the recesses in said cylinder, whereby when the key is inserted the cylinder may be rotated and moved axially to withdraw the tooth from engagement with the. slot in said shackle.

2. The combination of a' casing having a plurality of alined recesses, a tumbler in each of said recesses, a plurality of additional aligned recesses out of line with said first mentioned recesses, a tumbler in each of said additional recesses, a shackle having one end thereof rotatably secured to said casing, the other end of said shackle having a slot therein, a block, a tooth carried by said block adapted in locking position to be received in said slot, a cylinder having recesses adapted to receive said tumblers, said casing having an opening receiving said cylinder, said cylinder having a keyhole therein, and a key adapted to be received in said keyhole and to be moved laterally therein to expel said tumblers.

3. The combination of a cylinder having a longitudinal hole therein, a pin secured to said cylinder projecting laterally into `said hole, said cylinder having a plurality of recesses therein, a plurality of tumblers, movable in said recesses and a key having a slot therein, said key being adapted to be inserted into said hole and said slot being adapted to receive the end of said pin, said slot having a. branch to permit lateral movement of said key to expel said tumblers.

4:. In a. lock the combination of a casing, a cylinder revolubly and slidably mounted therein and having an annular slot, a block having a locking tooth thereon, a pin. secured to said block and slidably positioned within said annular recess, and a shackle having an end provided with a slot adapted to receive said locking tooth, said casing having a recess for said block.

5. In a lock the combination of a casing, a first and second set of spring pressed tumblers arranged in two spaced series, a

longitudinally slotted cylinder having apertures for the successive reception of said first and second set of tuniblers, said cylinder being revolubly and slidably mounted Within said easing, a block ievolubly joined to said cylinder and slidably carried by said .easing and having a. looking tooth, a. shackle having` an end provided with a slot for the temporary reception of said tooth, and a key

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