US2673458A - Padlock - Google Patents

Description

March 30, 1954 E. L. scHLAGE PADLOCK Filed Dec. 5, 1951 2 Sheets-Sheet l L .D y

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March 30, 1954 E. L. scHLAGE PADLOCK 2 Sheets-Sheet 2 Filed Deo. 3 1951 4free/vir Patented Mar. 30, 17954 UNITED PADLOCK Ernest L. Schlage, Burlingame,` Calin, assignor-to Schlage. Lock Company, Ya corporation,

Application December 3, 19511,sedermi.,59,650A` (o1. ac ext) 61Glaims; 1j

My invention relates to locks'ior use in connection with a shackle movable with respect to the lock body both in rotationl and in translation and controlled largely by a lock unit preferably of the pin-tumbler type.

It is an object o1 my invention to provide an improved padlock.

Another object of my invention is toprovide a padlock which is readily assembled and disassembled whenv it is inopen condition but which is very diiicult or access when it is in closedcondition.

A still further objectof my invention is toprovide a padlock in which the positioning and retention of the Various interior parts is accomplishedfin a superior fashion.

Another object of my invention is to provide a padlock which is comprised of parts readily manufactured and of a sturdy andlong lived construction.

Other objectsi together with the foregoing, are attained in the embodiment of theinventiondescribedl in the accompanying description and illustrated in the accompanying drawings, in which Figure 1 is across section for the most part on a transverse plane through a padlock of'my invention in locked position or condition.

Figure 2 is a view similar. toFigure l` but showing the padlock in unlocked condition.

Figure 3 is a cross section, the plane of which is indicated by the line 3 3of Figure 1.

Figure i is a cross section, the plane-.of which` is indicated by the line i-G of Figure 2.

Figure 5 is a fragmentary cross section, the f plane of which is indicated by theline 5-5 of Figure 1.

Figure o is a fragmentary view showing the split shell in plan and in expandedcondition with`V the bolt in transverse cross section.

Figure '7 is a cross section through thebolt. Figure 8 is a cross sectional View to an enlarged scale showing the bolt ofv Figure 7 in positionin the lock body.

Figure 9 is a side elevation ofthe plug.

Figurel is an end view ofi-the plug asrshown cated or machined to provide a pair otparaller ISD recessesl 'l and: 8 which enter the body from the upper face 9thereoffandis.likewisejprovidedfwith a pair of par-allelbores l liandj I Zwhich enterthe body from the-lowerl face l'3- thereof; The position of one offthe'bores- |I- is such that it intersectsthe recess l in an oiiset fashion to provide an intervening walll I4- therebetween. Therecess l is also provided with an interiorly enlarged chamber I6= formed by an undercutf portion. Somewhat similarly; the-bore H isprovided'with an interiorly enlarged chambery l'lformed` byv an undercut portion.

SlidablydisposedJWithin--the recess Bgisthe-long leg 2l:v of a shackle 2*,2Jalsojhaving a shortleg 23;A

The longfleg 2l is generallyicircular cylindricalin cross section, yet atitslower endis provided with a planar flat face 24Ymerging with a circumferential groove 26jt0 leave'a'flange 21 on'the shackle. A- coil spring'` 28 yis disposedlwithin the recess 8; at one endbears onl the body fr at'the bottom' of the recess andfat theother end bears againstjthe lower face orangem; Thus the spring normally tends to urgethe` shackle 22jy out of the The extent of outward movement of; the shackle is limited bylaplug 29formed, especially as shown in` Figures!)Y 'andf 1'0',A of stock circular cylindrical incross section'yet cut away to provide a lip 31e. The plug-2l` is-situated-in'anfinclined passageway 3-2- formedf' in',- the body 6 and openingintothe borev |2l andlalso in to the recess 3.- The plug'29- is introduced through the emptyv bore l2 to occupy ay positionA with the lip 3I-in thepath ofcthe flange 2"|s to limit the outward movement off' the shackle. SinceV the edge'offthe lipA 3 l i ts against` the surface 24-`, rotation of theY shackleV 22! is precluded.' except when the shackle is` in itsz extreme outermost position` in which instance the lip,31| rideswinthefgroove 26. Thel plug 2 9; is easily assembled'f after theshackle'22: has been positioned` in the. body and; is held against dislodement br a liebt Staking. ofh the material Qi the body: atftheflowenendofthe plug. To secure, the.- shackle 22V in its closed. yposition withv the shortA legv 23. received in. the recess` 1., the

body is provided'with a cross,V bore 36 inI which` a pair of pawls 31. and 3`8f' are translatable.. The. pawls are, each Providedwitncirular cvliriclrical bodies readily movablewithinthe cross boreax'id are normally spreadrapart-by Ipawlfspringsillf'and 4 I `.guided bythe walls'of cavities 42 in the individual -pawlsand' by pins llifortheexposed portion ofV the springs. The pawls arereadily assembled byintroduction into the bore 36':y After that the bore is closeclby a--seal/M; primarilya hardened plug. This is driven into the relatively softer material of the body and, being somewhat oversized and being grooved to form a sharp cutting edge 46, is effective when it is driven into position to broach the interior metal of the bore 36. This provides an inturned lip interengaging with the groove to hold the seal in position against dislodgment. The metal of the seal and of the lock body are finished flush and when brushed or polished cannot be visibly detected from the outside.

To actuate the pawls 31 and 38, each of them is provided with a projection 48 and 49 disposed on opposite sides of a tongue I rotatably projecting from the end of a lock unit 52 located within the bore I2. When the lock unit is actuated by an appropriate key 53, the tongue 5l is turned and abuts the depending portions 48 and 49 to slide the pawls within the bore 36 with respect to each other and to compress the springs 39 and 4I. The pawls themselves are then withdrawn from their spring pressed positions within notches 54 and 56 respectively provided in the facing portions of the shackle legs 2I and 23. When the key 53 is released, the springs 33 and 4I are eilective to project the two pawls into interengagement with the shackle 22.

The lock unit 52 is positioned within the body through the medium of a split shell 51, especially illustrated in Figures 5 and 6. This is provided with a side slot 58 to receive a iin 55 projecting from the otherwise circular cylindrical body of the lock 52. The iin is disposed in the slot 5S and is retained oy the bottom 6I of the shell. The shell itself has a substantially circular cylindrical envelope for much of its dimension, receivable within the bore II. The shell is particularly formed so that the slot 58 not only extends through one side thereof but is continued to provide a transverse slot 62 entirely across the upper wall 63 of the shell. The upper wall is extended to aiord a beveled outwardly projecting, interrupted circumferential ange 64 and when relaxed of an outer diameter readily slidable through the bore II. The location of the ilange 64 is such that when the shell 51 together with the lock unit 52 are positioned in the bores II and I2 in the body 6, the flange 65 registers with the undercut portion and occupies much of the chamber I1 so provided.

In order to hold the lock unit and the split shell in position as assembled within the body, there is provided a special bolt 66 as shown in Figures 1 and 8. The bolt is provided with the customary threaded shank 61 and has the usual screw driver slot 68 in its head 69. In addition, however, the special bolt has a deformable skirt 1I surrounding its head and when rst constructed extending outwardly and downwardly to form an abutment ring 12. The diameter of the skirt 1I is suiciently small so that the bolt can pass through the recess 1 without dimculty.

When the parts are assembled, the bolt is introduced into the recess 1 and the threaded shank 61 passes through the communication between the recess 1 and the bore II and engages the threaded walls 13 of a bore in the split shell 51. The upper entry of the bore 13 is conical so that the bolt 66 enters readily but as it is turned and threaded more and more into the aperture 13 it widens the gap 62 and spreads the split shell laterally apart. The material of the shell itself is somewhat deformable or resilient so that when the bolt is fully engaged, the ange 64 is spread 4 outwardly into the recess I6 so that the shell cannot be withdrawn while the bolt is present.

Alternatively, by slightly changing the proportions of the split shell 51, the split shell can be made of a size to pass readily into the bore II and to have the parts of the flange 64 spring outwardly into the chamber I1 so that no further expansion is necessary. In this instance, the shank 61 of the screw does not distort the split shell but merely prevents the shell from collapsing inwardly. In fact, the threaded walls 13 can be tapped oversize for ready assembly and disassembly.

In addition and to keep the bolt 66 from too ready dislodgment, the skirt 1I engages the body 6 of the lock at the bottom of the chamber provided by the undercut recess I6 and as the bolt is screwed in, the skirt 1I is deformed outwardly as shown in Figure 8 until it substantially occupies the undercut chamber and has a diameter in excess of the diameter of the recess I1. The bolt is not only locked in position by this deformation but cannot readily fall out of or be removed from the chamber I6 without again deforming the bolt in a reverse sense.

If the bolt should become partially loosened a serious amount it projects into the path of closure of the short leg 23 and prevents closure of the shackle, thus indicating the disorder.

With this arrangement, when the shackle 22 is in open position all of the structure can be assembled as indicated, but when the shackle 22 is forced into locked position with the pawls 31 and 38 in engagement with the notches 54 and 56, the short leg 23 of the shackle being in the recess 1 overlies the bolt 66 and precludes the use of any tool for the extraction of the bolt. Since the bolt has expanded or retains the shell 51 in position, the shell itself cannot be withdrawn from the bore II. Since the extension 59 of the lock unit 52 is itself confined within the shell, the lock unit cannot be withdrawn. Furthermore, the lock unit itself is in the path of withdrawal of the plug 29 so that the plug is substantially immovably held in engagement with the long leg 2I of the shackle. In this construction, therefore, the lock is held in assembled condition and cannot readily be tampered with when it is locked. However, when it is unlocked and the short leg 23 is moved from the recess 1, then upon deformation and unscrewing of the bolt 66, the shell 51 and the lock unit 52 can be withdrawn from their several bores and the plug 29 if necessary can be extracted.

What is claimed is:

1. A padlock comprising a body having a pair of parallel recesses therein and having a pair of parallel bores therein, one of said recesses and one of said bores communicating and having undercut portions, a shackle having a short leg receivable in said one recess and having a long leg receivable in the other recess, a shell of resilient material partially split to form two opposed sides and positioned in said one bore, a lock unit receivable in the other bore and having a projection extending into said shell, pawls disposed in said body and engageable with said legs, means operated by said lock unit for actuating said pawls, a bolt in said one recess and threadedly engageable with said split shell for urging said sides away from each other whereby portions of said sides enter one of said undercut portions, and a deformable head on said bolt engageable with said body to spread into the other of said undercut portions.

2. A padlock comprising a body having a recess therein and having a bore therein, said recess and said bore communicating and having undercut portions, a shell of resilient material partially split to form two opposed sides and positioned in said bore, a lock unit having a projection eX- tending into said shell, a bolt in said recess and threadedly engageable with said split shell for urging said sides away from each other whereby portions of said sides enter said undercut portion of said bore, a deformable head on said bolt engageable with said body to spread into said undercut portion of said recess, and a shackle controlled by said lock unit and movable on said body to extend into said recess.

3. A padlock comprising a body having a recess therein and having a bore therein, said recess and said bore communicating and having undercut portions, a shell of resilient material partially split to form two opposed sides and positioned in said bore, a lock unit having a projection extending into said shell, a bolt in said recess and threadedly engageable with said split shell for urging said sides away from each other whereby portions of said sides enter said undercut portion of said bore, and a shackle controlled by said lock unit and movable on said body to extend into said recess.

4. A padlock comprising a body having a bore therein, said bore having an undercut portion, a shell of resilient material partially split to form two opposed sides and positioned in said bore, a lock unit having a projection extending into said shell, a bolt threadedly engageable with said split shell for urging said sides away from each other whereby portions of said sides enter said undercut portion, and means controlled by said lock unit and movable on said body to overlie said bolt.

5. In a lock mounting device for use with a padlock having a body formed with a recess in one side thereof and adapted to receive one end of a shackle therein and a lock socket on the other side of said body for receiving a lock, said device comprising; a tubular cylindrical shell adapted to be received in a complementarily formed bore opening outwardly of said other side of said body and communicating with said socket, a bolt threadedly received in one end of said shell and engageable with the bottom of said recess for holding said shell in said body, said shell being partially split from said one end axially of the same to form a pair of opposed sides separated by a pair of radially outwardly opening slots with one of said slots adapted to receive therethrough the combination extension of a lock in said lock socket, said sides being deformable whereby turning said bolt into said shell will spread said sides apart into engabement with the sides of said bore.

6. In a lock mounting device for use with a padlock having a body formed with a recess in one side thereof and adapted to receive one end of a shackle therein and a lock socket on the other side of said body for receiving a lock, said device comprising: a tubular cylindrical shell adapted to be received in a complementarily form-ed bore opening outwardly of said other side of said body and communicating with said socket, a bolt threadedly received in one end of said shell and engageable with the bottom of said recess for holding said shell in said body, said shell being partially split from said one end axially of the same to form a pair of opposed sides separated by a pair of radially outwardly opening slots with one of said slots adapted to receive therethrough the combination extension of a lock in said lock socket, said sides being deformable whereby turning said bolt into said shell will spread said sides apart into engagement with the sides of said bore, said bolt having a deformable head and having a shank adapted to pass through the bottom of said recess Yinto engagement with said shell whereby pressure between the bottom of said recess and said head will spread the latter radially outwardly toward the walls of said recess.

ERNEST L. SCHLAGE.

References Cited in the ile of this patent UNITED STATES PATENTS 66,985 Denmark June 7, 1948

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