US2202329A

US2202329A - Antipick lock

Info

Publication number: US2202329A
Application number: US284334A
Authority: US
Inventors: Braune Sholom
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-07-13
Filing date: 1939-07-13
Publication date: 1940-05-28
Anticipated expiration: 1957-05-28

Description

May 28, 1940- -s. BRAUNE 2,202,329

ANTIPICK LcK Filed July 1s, 193s 5201022 mww bodying a cylinder rotatably housing a key plug APatented May.v I* 1 940 AN'rlrl'ckLocK l Sholom Braune, Fitchburg, Massf ,Application July 13, 1939, serial No. 284,334` 'v 4s claims. y (01570-419)y This invention relates to lcertain new and use` tul improvements-Vin-antipick lock.

The primary object `of they invention is to pyro-fl vide a key plug normally restrained/ against ro- 3 tation Within a lock cylinder by means of tensioned co-acting driver pins and pin tumblers with thev driver pins and rotatable key plug cooperatively constructed to prevent `unauthorized or surreptitious operation or picking of the lock inthe absence of the proper operating key therefor. f

A vfurther object of the invention'is-to provide apick-proof lockof the foregoing character emwithtensioned topdriver pins coacting with pin tumblers tourestraingthe ykeylplug from rotation, vthe cylinderl and key plug having registering holes therein for the mounting of the driverand pin tumblers, the side of the key plug through which the holes extend being longitudinally flattened or.'

milled to provide a'flat vsurface at each side-of the tumbler vpinhole and an over-hanging side shoulder for' interlocking engagement with a mushroometype driver pin to prevent rotation 'of .Y the key plug to the releasing position` of ythe lock bolt.Y i

l With the above and other'objects in view that ywill become apparent as the nature yof* the inev vention is better' understood, the. same'consists 5G- inthe novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed. In the drawing: I

- Figure 1 is a longitudinal sectional View of a {pick-proof lock constructed in accordance with the present invention, a key being illustrated as positioned inv the key'plug and the tensionecly driver pins and. tumbler -pins forming a part of thelockr mechanismbeing positioned to permit rotation of the key plug;

Figure 2 is a vertical cross-"sectionalv View of the lock structure shown in'Figure l, the key beingremoved, the key plug'being partly rotated with arnush-room-type driver pin interlockingly engaged with the side shoulder orvflangeborder-'i ing a longitudinally milled portion on the side of the-key plug; Y

@Figure 3 is Ian enlarged perspective view of the l key plug removedfrom' the cylinder and illusl' trating' the milled side* of thev plug through which `the tumbler openings extend V`-and'illustrating a l'c'ngituclinallyv extending overhanging flange at each side of the 'milledfsurfac 1` Figure 4 is a topvplan view on a reduced'scale y of anotherfform of keyplug havingtumbler pin openingsv and a milled surface with alongitudif nallysplit bearingr sleeve surrounding the 'plug With'the split ends thereof terminating at oppoe site edges ofthe milled surface; `and f Figure 5 lis a topplan View of another form ofV bore. therein for the rotatable-reception of a key plug I2. The forward end :of the key plug I2 is; provided Witha'n enlarged annular-flangel3 cooperating withthe walls of a' recess formedfin. the front Wall Ill of the cylinder I0 to limit inf jecting beyondzthe inner end. of the cylinder I0y and rcarrying a substantially; rectangularblocky projection I5 rfor the mountingjof alaterally di rected lockinggar'm or bolt -I6,thatfis movable overy the inner end of the cylinder I0 as will be readilyunderstood from anv inspection of Figure 1, :with the lock-bolt retained in position onpthe key plug I2 by means of screws'or the like passed therethrough and enteringrthreaded openings I1 in .the inner end of the key plug I2.

ward movement of the key plug in the cylinder,4 the inner orrear end of the'key plug I2 pro-.A

' The key plug I2'has alongitudinally extendn ing key slot` lextending completely through the same, the side walls of the key slot being ribbed,y

.and grooved ina conventional manner for the mating reception of the shank kI Soi an operating key for the lock and said key plug further has a longitudinally extending seriesr of radially gli-. v

rected holes20 therein opening at oneside of ,thev

key plug, I2 and ycommunicating with the key` slot. I.4 Asshown in Figures 1 and v2,.tumbler pins 2ly of varying vlength for coaction with the wards of the key I9, are mounted-.in the holesZ,

A longitudinally extending series of .radially disposed holes 22 is formed inthe cylinder IllftheA v open ends of the. holes 22 communicating A.with

the bore inthe cylinder in whichthe key plug V'Iv2.

is mounted and said holes 22iare vspaced for registry with corresponding holesv 20 in the key plug I2 as shown in Figure 1. lTop driverfpins 234.gif,` themushrooln-type are loosely mounted in the` holes 22 in4 the cylinder..l0, 'the driver .pinsnxZv being preferably of varying lengths andeach inn-N cluding an annularly reduced neck 24 adjacent its inner end providing a disk head 25 at the lower terminal end of the pin 23. Each hole 22 houses a coil spring for forcing the top driver pins 23 in directions toward the key plug I2.

The top surface of the key plug I2 is longitudinally cut-away or milled as at 21 in line with the surface ends of the holes 20 as clearly shown in Figures 2 and 3, the milled surface 21 extending laterally of each side of the holes 20 providing longitudinally extending grooves 28 and inwardly directed overhanging side flanges 29 at each longitudinal side of the series of holes 20.

With the key shank I9 in the key slot I8 of the key plug I2, as shown in Figure 1, the tumbler pins 2| are raised to elevate the top driver pins 23 against the tension of the springs 26 associated therewith for positioning the contacting ends of the top driver pins and the tumbler pins in the plane of the bearing surface between the key plug I2 and the bore in the cylinder I0 and at which time the key plug I2 may be rotated by the key shank I9 for the operation of the lock bolt I5. When the key shank I9 is removed from the key plug I2, the springs 26 force the top driver pins 23 and the tumbler pins 2l in a downward direction into the openings 20 in the key plug I2. If an attempt is made to pick the lock by the surreptitious operation of the tumbler pins and driver pins in the absence of the authorized key illustrated, upward movement of the tumbler pins 2l will elevate the top driver pin 23 against the tension of the spring 26 with the head 25 upon the lower end of the top driver pin moved outwardly of the hole 20 and into the plane of the milled surface 2l. A partial rotation of the key plug I2 causes the head 25 of the top driver pin 23 to ride upon the milled surface 2'I and be interlockingly received in a side groove 28 with the adjacent flange 29 l moving into the reduced shank of the top driver pin afforded by the reduced neck 24 and into the position shown in Figure 2 whereupon it is impossible to further elevate the top driver pin 23 to place the same upon the periphery of the key plug I2. There isno position of rest upon the' milled surface 2l of the key plug I2 upon which all of the top driver pins 23 could be p0- sitioned and accomplish subsequent rotation of the key plug for the lrelease of the lock bolt I6 because any slight movement of a rotary character of the key plug I2 will vpositively form an interlocking connection between the ltop driver pins 23 and the key plug so that it is impossible to pick the mechanism of the lock.

In the form ofthe invention illustrated in Figure 4, the key plug has a top longitudinally milled surface 2l with holes 20 opening at the milled surface. The key plug is enclosed by a split bearing sleeve 3l) extending the entire length thereof with the split ends 3l terminating at opposite longitudinal sides of the milled surface 2l substantially in line with said flanges or abutment shoulders 29.

In the form of inventionv illustrated in Figure 5, the key plug is enclosed by a bearing cylinder 32 that has a series of longitudinally extending spaced openings 33 therein disposed over the milled surface of the plug and of a diameter larger than the diameter of the tumbler pin receiving holes 20 and with diametrically opposite sides of the openings 33 substantially in line With said flanges or abutment shoulders 29. The split sleeve 30 shown in Figurel `and the sleeve 32 shown in Figure 5 are secured in position on the key plug by means of a set screw 34.

Froml the above detailed description of the invention, it is believed that the construction and operation thereof will at once be apparent and while there are herein shown and described the preferred embodiments of the invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

I claim:

1. A lock including a cylinder, a plug rotatably mounted in said cylinder and having a key slot, the cylinder and plug having registering pin receiving holes, spring-pressed top driver mushroom-type pins mounted in the cylinder holes, tumbler pinsmounted in the plug holes, and a pair of flanges extending longitudinally of the plug at the periphery thereof in the zone of the tumbler pin holes for interlocking engagement With the top driver pins said flanges being spaced laterally of the holes in the plug.l

2. A lock including a cylinder, a plug rotatably mounted in said cylinder and having a key slot, the cylinder and plug having registering pin receiving holes, spring-pressed top driver mushroom-type pins mounted in the cylinder holes, tumbler pins mounted in the plug holes, the top surface of the plug having a longitudinally milled surface extending across the outer ends of the tumbler pin holes in the plug with the side edges of the milled surface disposed laterally from said holes at opposite sides thereof and providing longitudinal abutment shoulders laterally of said holes for abutting engagement with the top driver pins at points inwardly of the periphery of the plug.

3. A lock including a cylinder, a plug rotatably mounted in said cylinder and having a key slot, the cylinder and plughaving registering pin receiving holes, spring pressed top driver mushroom-type pins mounted in the cylinder holes, tumbler pins mounted in the plug holes, the top surface of the plug having a longitudinally milled surface extending across the outer ends of the tumbler pin holes in the plug with the side edges of the milled surface disposed laterally from said holes at opposite sides thereof and providing longitudinally extending side grooves laterally of the milled surface and laterally of the tumbler pin holes for reception of the mushroom heads of the top driver pins to prevent rotation of the key plug to bolt releasing position.

4. A lock including a cylinder, a plug rotatably mounted in said cylinder and having a key slot, the cylinder and plug having registering pin receiving holes, spring pressed top driver ,mushroom-type pins mounted in the cylinder holes, tumbler pins mounted in the plug holes, the top surface of the plug having a longitudinally milled surface extending across the outer ends of the tumbler pin holes in the plug with the side edges of the milled surface disposed laterally from said holes at opposite sides thereof and an inwardly directed longitudinally extending fiangeat each side of the milled surface spaced outwardly of said milled surface and laterally of said holes and defining a longitudinally extending groove laterally of the tumbler pin holes for reception of the mushroom heads of the top driver pins to prevent rotation of the key plug to bolt releasing position.

5. A lock as set forth in claim 1, characterized by a split bearing sleeve inclosing the key plug with the split ends of the sleeve respectively terminating at opposite sides of the milled surface and laterally of said holes and in line with said flanges.

6. A lock as set forth in claim 2, characterized by a split bearing, sleeve inclosing the key plug with the split ends of the sleeve respectively terminating at opposite sides of the milled surface and laterally of said holes and in line with said abutment shoulders.

7. A lock as set forth in claim 1, characterized by a bearing sleeve inclosing the keyplug and having aseries of openings therein registering