US2160294A - Padlock - Google Patents

Description

May 30, 1939- A H. E. soREF 2,160,294 PADLOCK 'f Fiied Nv. 17, 1937 QEW 600mb@ Patented May 30, 1.9*39

PADLOCK Harry E. Soref, Milwaukee, Wis., assigner to Master Lock Company, Milwaukee, Wis., a corporation of Wisconsin Application November 17, 1937, Serial No. 175.003

Claims. (Cl. 70-38) The invention relates to locks and more particularly to padlocks.

An object of the invention is to provide an improved lock structure of simple, durable and in- 5 expensive construction, capable of easy assembly,

and especially suitable for padlock use.

Another object of the invention is to provide a lock structure which can readily be assembled to produce various keychanges, and which requires but relatively few parts.

The invention further consists in the several features hereinafter described and claimed.

In the accompanying drawing, illustrating an embodiment of the invention,

Fig. 1 is a iront View of a padlock constructed in accordance with the invention;

Fig. 2 is a rear view thereof, parts being broken away and parts being shown in section;

Fig. 3 is another rear view, parts being removed and broken away and parts being shown in section;y

Fig. 4 is a sectional elevation of the padlock, looking from the rear, and taken generally in the plane of the shackle, the shackle being open and a key being shown in unlocking position;

Fig. 5 is a sectional elevation taken generally along the line 5-5 of Fig. 1;

Fig. 6 is a sectional view taken generally along the line 5-5 of Fig. 4, the shackle being returned to locking position; I

Fig. '7 is a front view of an inner lock case with attached parts;

Fig. 8 is a detail view of one of the locking levers, and

Fig. 9 is a detail view of one of the ward members.

In the drawing, I5 designates a lock case, here shown to be of cylindrical formand to have flat, parallel front and rear plates I5 and I1, respectively. The front plate I6 is preferably integral with the cylindrical portion of the case to form a cup, and the rear plate I1 marginally bears on the edge of the cup. The case I5 is enclosed by a cup-shaped shell I8 which fits closely thereon and has an outwardly dished front portion I9. Positioning nubs 20 onthe front plate I6 enter embossments 2| on the front portion of the shell.

An outwardly dished rear cover plate 22 marginl ally bears on the rear plate I1, and both of these plates are secured in place by a bead or flange 23 formed by spinning or curling over the rear edge of the shell. A positioning lug 24 on the edge of the rear plate fits in a notch 25, Fig. 2, in the edge of the cover plate. The various parts above described are conveniently formed of sheet metal stampings. If desired, the rear plate I1 may be provided with a central projection 26, such as a stud riveted thereto, to support the dished portionof the cover plate 22.

A guide member 21, preferably in the form of 5 a flat, sheet metal stamping, has a projection 28 at one side edge riveted or otherwise secured in an anchor slot 29 formed in the front plate I6, Fig. '1, and has a projection 30 at its other side edge which ts in a slot 3l in the rear plate 11,710 Fig. 2. .The guide member extends across the space between the front and rear case walls and has formed therein a shackle-guiding opening 32, Fig. 4.

The case and shell have openings 33 therein 15 to slidably receive the legs of a U-shaped shackle 34, the long leg of the shackle also slidably and rotatably passing through the guide member opening 32, and the short leg having a beveled end and a locking notch 35 near this end. An 20 annular groove 36, Fig. 4, is formed about the end portion of the long shackle leg and slidably receives therein a forked stop plate 31 which is engageable with the guide member 21 to limit the outward movement of the shackle. The 25 forked stop plate 31 is conned on the shackle leg by the slidable engagement of an edge of the plate with the flat inner face of the rear case plate I1.

The shackle is preferably spring-urged out- 30 wardly, as by means of a coiled compression spring 38 which enters the tubular end of the long shackle leg. The spring is guided by a headed stem 39 therein, the head of the stem resting in a positioning seat 4l?, Fig. 4, formed in 35 a plate 4I which is secured in the case and is spaced downwardly from the guide plate 2l. The plate 4I has a projection 42 at one side edge lriveted or otherwise secured in an anchor slot 43 formed in the case front plate l5, Fig. 7, and 40 has a projection 44 at its other side edge which ts in a slot 45 in the rear plate l1, Fig. 2. One end of the plate 4I has a downwardly offset portion 46 which forms a key-guiding ledge and stop.

A guide pin or stud 41 is rigidly riveted at one 4,5 end on the front plate I 6, and has its other end fitting in an opening 48, Fig. 2, formed in the rear plate I1, the pin extending at rght-angles to the front and rear plates and being at the side portion of the case adjacent the short shackle 50 leg.

Mounted on the guide pin `41 are a number of flat metal plates, six being shown by way of example, lling the depth of the case between the y front and rear case plates. Two of these plates, 55

49 and 50, constitute locking members or bolts, and are in the form of tumbler-like levers pivotally mounted on the pin, each lever being provided with an opening 5l to receive the pin. Each locking lever has a hooked upper end 52 engageable with the notched end of the short shackle leg to thereby lock the shackle. Each locking lever is urged to locking position by a narrow leaf spring 53 which has a hooked end portion. engaged in a pocket 54 in the lever, the other end portion of the spring slidably bearing againstan edge of the guide plate 21, this edge being spaced from the pin 41 and extending parallel toi the pin. The spring width is about the same as the lever thickness. The two locking levers have respective concave key-sweeps orkey-engaging surfaces 55 at their lower side edge portions, and are similar except that the key-sweep of lever 49 projects farther than that of the other lever 50. The lever 49 is here shown to have an opening 56. which serves to facilitate handling of the leverand to distinguish the levers, during assembly. Each lever: has, a shoulder 51 which bears against the4 inner periphery of the lock case; to. limit the spring-urged locking. movement of the lever, and each lever also has a corner or projection 51' which is engageable with the inner periphery of the lock case to limit the movement of the lever in unlocking direction.

The other four plates. on.- the pin 41 are ward members 58 and 59, two of each,'whioh are interchangeable toI produce key changes, the levers 49. andv 50; being also interchangeable for this purpose. The ward plates have openings 60 through which the pin 41 passes, and are confined against rotation on thepin, eachA plate being provided; with a finger itt to engage. the under side of the guide plate 21 and further provided with a nger 6.52 and a shoulder G3i to engage the inner periphery of. the lock case. The ward plates 58 and 59 are similar except that each of the plates 59, Fig. 9, is provided with a notch 64 for keyclearance and to; present a key-stopping shoulder 65.

The front case plate ItV and front wall of the shell are provided with respective openings 65 and 61 placed in alignment, each. opening having a circular portion anda slot-like portion projecting downward from the circular portion. A slotted key guide or cylinder E8- is journalled inthe openings 66 and 61 and` has a peripheral1 flange 69loosely fitting in the space between the front plate I6 and front wall of the shell. A key 10, preferably of the corrugated type, is adapted to enter the key guide and has bits 1l at various distances from the rotational axis of the key, some of the bits being engageable with the keysweeps on the locking levers 49 and 50i Theend. of the key distant from the handle rotatably fits in a circular opening 12V formed in the rear case plate l1. k y

In assembling the padlock, the plates 21 and 4| and the pin 41 are riveted tothe plate I6 of the cup-shaped lock case, .and the case is then inserted into the shell l8r', the key guide 68 having been placed in position. Two of the ward plates are placed on the*V pin 41, followedv by the two spring-pressed lever plates 49 and 50' and the two remaining wardy plates. 'I-he order of the-several plates is varied in different locks so as tol provide for key changes. Each spring 53 is inserted in the corresponding lever plate and flexed: before this sub-assembly is placedin the case.v The. two locking lever plates are preferably placedv centrally between the ward plates, so as to centrally engage in the shackle notch, Fig. 5, but in some instances the lever plates may have diiferent positions, provided they are still engageable in the shackle notch. The shackle and its spring means are then inserted, followed by the studcarrying rear plate I1 and rear cover plate 22. The shell I8 is then spun over the cover plate to complete the assembly. The lever plates and their springs are. retained against lateral shifting by the adjacent ward plates.

In operation, when it is desired to unlock the n padlock, the key 10 is inserted into the rotatably mounted key guide 68, Fig. 4, the key being further guided by the oiset end 46 of the plate 4| so as to enter the opening 12 in the rear plate l1, and to; prevent rotation of the key in the wrong direction. The key is then turned counter-clockwise, as viewed in- Fig., 4, causing certain bits of the key to engage the concave edges or keysweeps 55 of the locking levers and to turn these levers on the. pin 4:1 against the action of the springs 53 to the shackle-unlocking position seen in Fig, 4, the.r Vrotation of time` key being. stopped by the shoulders 6.5; on the; ward plate 59. The shackle when released is moved outwardlyY to released positionby its spring 38,. and when released .may be swung; aboutV its; long` leg. as a, pivot. If

itis attemptedto use a different key, having the key bits in other positions-, theV ward plates. and locking levers will. prevent unlocking movement. In their unlocking: position the lower corner 51 of at least one. of. the. locking levers is close to the inner periphery of' theV lock case, so i that. if it is attempted to move the. locking. levers to` unlocking. position. by a key having. tumbler-engaging bits of about the; same radius, only one` of the levers. will bel released; from lockinga position, the other remaining in locking position.

While the lock structure of the invention is here shown to. be embodied in a padlock, certain features of the structure are also applicable to other types` of locks,.sucln asdoor locks` or cabinet locks.

What I claim as new and. desire tov secure by Letters Patent is.:

1. In. a lock, the combination of a lock case, a pin secured in said case, and a plurality of apertured plates. mounted on said pin, one of said plates` being pivoted' on: said pin and forming a locking lever adapted? tobeoperated by aturnable key .andi to engage a. lockable member,4 and another of said plates forming a ward; member, said` ward member having a key-stopping shoulder to limit the turning of the key in unlocking direction, and said plates being interchangeable on said pin to provide for key changes.

2'. Ina padlock, the combination. of alock case having a pivot member therein, an apertured guide member securedinsaid case, a shackle slidableY insaid l'ock case and int said guide member., a key-operated locking lever lockingly engageable with` saidV shackle andl swingable on said. pivot member; and a spring bearing on said guide member and'urging said lever to locking position.

3. In a padlock, the combination of a lock. case, a slidably guided' shackle, a. plate secured in. said case and'-y having arr offset' end portion presenting akey-guiding surface, spring means engaging said plate for` urging said shackle outwardly, a key-operated locking lever in said' case engageable with saidl shackle; .and-a key-guiding member rotatably mount/edin said case..

'j 4-. In a padlock, the combination of4v an apertured lock casehaving a pivot member therein, anA apertured guide plate' secured in said: case, a

shackle slidable in said lock case and guide plate, a key-operated locking lever engageable with said shackle and swingable on said pivot member, a Ward plate mounted on said pivot member and engageable with said guide platev to prevent rotation of said plate, and a spring bearing on said guide member and urging said lever to locking position.

5. In a lock, the combination of a look case having spaced outer and inner front wall portions With aligned openings, an .apertured keyguiding member journalled in said openings and having an intermediate peripheral flange loosely conned between said wall portions, and keyoperated locking means in said case.

HARRY E. SOREF.

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