US2428902A - Padlock - Google Patents

Description

Oct. 1 4, 1947.

L. w. YOUNG I vPADLocK Filed March 16, 1945 Patented Oct. 14, 1947 UNITED STATES PATENT OFFICE :PADLoofKf' Leonard Wear'ei'Young, Northwood, Ilngulamil'- Appucation March 1s, 1945, Sernin@ 5533,046 In Great Britain 'November 12, 1943 'sctin 1, Public Law 69o, August 8,1946.H Patent expires November 12, 1963 the centre line of' Which-is preferably displaced from the axis of rotation'of' the discganda lock for locking the disc'in a positionin which the slot in' its marginistransversetb the slot inthe edge of the housing.

The'interior' of the housingA may lconver'iiently be cylindrical to tthe'cylindrical 'edges of the disc, which thus yrotates within the housing with# out the necessity of a central pivot pin:

The lock may 'be of any eonve'nie'entl type,- for example the lever' t'ype or of the' pin" tumbler type. In the latter caseY the spring-pressed tumblers may behoused n-bores intheedge of the disc and co-operateY with pins sliding in bores in the housing and operated by' a keyl which can be inserted in a key hole in the housing. It is preferred, however, to provide a separate tumblerlock cylinder mounted inthe bodyY portion of the housing. 'I'his cylinder is provided withl a locking'mernber co-operating with a shoulder on the edge of the disc so that in one lposition of the cylinder the lockingmember engages the' shoulder to prevent rotation of the disc while in anotherposition to which the cylinder can be turned by the key the locking member is out of engagement with the shoulder, with the result vthat the disc can be turned to release the hasp.

The slots inthe housing and-in the disc may be arranged so that the hasp will co-operate with the edges of the slots' to rrotate the disc in either direction. Alternatively the slots may beso arranged that although the'insertion of the hasp willv turn the'disc into the locked'position, an attemptto withdraw the hasp will be ineffective' to the disc intothe unlocked position, the two slots being substantially perpendicular to' ori'e4 another. In this case an arcuate slot is provided inthe cover plate for the insertion of a' screw-threaded pininto a screw-threaded hole inthe di c after the padlock has been assembled; This 'in the outer Vsurface of thecovplate and i'rovides a meansv whereby the disc'ean be rotated readily. According to a further feature of the invention means are provide'l whereby the lock vrne :l"i i nism `can be assembled with the housingl after thev cover plate has beenl secured in position. thecover plate maybe secured to the body portion 'of thehousing by a method involving heat, for examplev brazing, welding or the like, without drawing the temper of the springs forming part of the' lock mechanism.

Referring to the acc'ornpanying drawings; F'ig'ur'e'l is aside elevation in section of one form of padlock inthe open position;-

Figure 2 is a similar View showing the padlock in the'closed position;

Figure `S'is a section along the line III- III in Figure 1 Figure 4 is alsection along the line IV--IV in FgurZ; ,A Figure5`is aview similar 'to Figure l of a, modi* ed construction projects beyond ,f

Figure 6 isa similar View ofwanother modification;

kFigure 7 is asection along/the-line VII- VII in Figure Figure 8 is a View similar to Figure 14 of -a further modi'iied con-struction; and

Figure 9' is aside elevation of Figure with the cover plate in position.

Referringv to Figures 1 to'4, a housing Ill' is formed'with a cylindrical recess l2 in which rotates aY cylindrical discv I4 constituting a shackle. 'Ifhe housing is formed with a slot I6 which is O ITsetslightly to one side as shown; The disc Ul is formed with a similarY slot I8 which isfalso oisetfthat is to say its centre-lineis dis placed froma diameter of the disc. When theentrances to the two slots arezin register as shown in Figure 1 one side of the slot I8 is presented at an angle to the slot I5.' When the haspl `2l) to which the padlock is to be secured is'inserted it willY co-'operate with'the inclined surface tocam thejdisc i4 round toY the closed position shown in Figure 2. The opposite edge of theslot I8 is then presented at an angle such that when theghasp lis pulledoutwards along the slot i6 the .disc is' returned tothe open position, releasing the halspz` k f 'hedisc l-is'iormed with a notch 22V which extends across the whole width of the disc and this notch communicates with a recess 24 the depth of which is one half of the width of the disc. The notch 22 receives the inner end 26 of a cylinder 28 similar to the cylinder of an ordinary pin tumbler lock, carrying pins sliding in transverse bores and co-operating with springpressed tumblers 3D sliding in bores in the housing Ill. Normally these tumblers lock the cylinder in the position shown in Figure 2 but the insertion of a correct key frees the cylinder and enables it to be rotated. The end 26 of the cylinder is cut away as clearly shown in Figures 3 and 4 to semi-cylindrical shape. In the position shown in Figures 2 and 4 this part 26 is in engagement with the right hand side of the notch 22 thereby preventing the disc I4 from rotating in the clockwise direction, while rotation in the anticlockwise direction is of course prevented by engagement of the part 26 with the lefthand side of the notch. When the cylinder 28 is rotated by the key into the position shown in Figures 1 and 3, the part 26 is in register withthe recess 24 and no longer in engagement with the right hand side of the notch 22. Thus the disc I4 can turn as previously described into the position shown in Figure l to release the hasp 26.

The bore in the housing I6 for the cylinder 2B is counterbored as at 32 to receive the end of an outwardly spring-pressed pin 34 mounted to slide radially in a bore in the cylinder. When the cylinder is first inserted in the housing this pin 34 is pressed inwards but when the cylinder is completely inserted the pins spring7 outwards into the counterbore 32. thereafter preventing the withdrawal of the cylinder. Stops (not shown) may be provided in the counterbore for engagement with tbe pin 34 tclimit the rotation of the cylinder to 180,

It is evident that the cylinder 28 and the tumblers 3i! and their springs can be inserted after the cover plate 36 (Figures 3 and 4) has been secured to the housing I8. It is therefore possible to secure the cover plate to the housing by brazing, spot welding or a like operation involving heating, which would be impossible if the tumblers and their springs had to be assembled with the padlock before the cover plate is secured in place.

Preferably the disc I4 is formed with a projection 38 engaging in an arcuate recess 40 in the cylindrical side of the recess I2. This ensures that the disc I4 is ina position, after the cover plate has been secured, in which either the notch 22 or the recess 24 will receive the end 26 of the cylinder. A

Y It will be appreciatedthat when the cylinder is in the position shown in Figure 1 the key cannot be withdrawn and the disc I 4 cannot be locked in the open position. In the modified construction shown in Figure a second notch 23, similar tothe notch 22, is provided which, when the disc 1s in the open position, is in register with the part 26 of the cylinder, enabling the cylinder to be turned back to the locked position in which the key can be withdrawn, the disc I4 then being locked in the open position. If thepadlockhas the dimensions and proportions shown, the part 26 of the cylinder 28 must be of smaller diameter than the rest o f the cylinder so that the two notches 22, 23 vdo not break into one another.

Referring now to Figures 6 and '7the housing I0 and the disc I4 are generally similar to those shown in Figures 1 and 2. The cylinder 28, however, is arranged at right anglesto the Vposition that it occupies in Figures 1 and 2. Its

end 21 is squared to i-lt a square hole in a locking member 42 co-operating with a notch 44 in the periphery of the disc I4. As clearly shown in Figure 7, when the cylinder 28 is locked against rotation the locking member 42 is in engagement with the side of the notch 44 thereby locking the disc I4 in the closed position. When a correct key is inserted the cylinder can be rotated to move the locking member sideways out of enga/gement with the notch 44 thereby enabling the disc I4 to rotate into the open position to release the hasp.

Referring to Figures 8 and 9, the locking mechanism is of the combination type, consisting of a number oi discs 46 formed with ilats 48 in various angular positions relative to central slots 56 in the disc. These discs are threaded on a spindle 52 journalled in the disc I4 and having a projection 54 co-operating with the ends of the slots 56. This is a Ywell known form of locking mechanism and need not be described in detail. The spindle 52 carries a knob 56 and a graduated dial 58 co-operating with an index 69 and this knob is turned to successive positions right and left according to the dialling required to align all the ats 48 in a position indicated by the dotted line in Figure 8 such that the disc I4 can rotate in the housing ID,

The disc I4 in Figures 8 and 9 differs from that shown in earlier figures in thatwhen it is ,in the closed position the slot I6 is at right angles to the slot I3. The disc I4 however can be rotated into the open position merely by pulling the hasp outwardly along the slot I6 as in the constructions described above. Itcan also be rotated by means of the knob 56,'9. slot 62 being provided in v the cover-plate of the-housingY to receive the for locking spindle 52. This slot is covered up at all times by the dial 58. When some'other form of lock is used, such as those shown in Figures l, Zand 6, a pin 64 (Figure 6) may be screwed into a hole in the disc I4, this pin projecting` through'a slot 65 in the cover-plate and providing a means whereby the disc I4 may be rotated. In some cases this pin may project from the edge of the disc through a slot in the edge of the housing.

It is evident that the cover plate may be secured to the housing by means of rivets or any other well known method, although in most cases brazing or welding will be preferred on account of their greater security;

What I claim is: v y

1. A padlock comprising a housing provided with a cylindrical bore and an oiset marginal slot for the entry of `a hasp, a cylindrical disc tted in said bore, said disc having an oiset hasp slot, said disc being rotatable from a first position where the mouths of said slots are in registry and the bottoms of the slots are out of registry to a second position where the bottoms of the slots are in registry and the mouths are not, and means said disc in said second position,

2. A padlock according to claim 1 wherein the means for locking .said disc in'said second position comprises a locking member mounted in said housing, said rotatable disc being provided with a notch that provides a shoulder, vsaid locking member being mounted for movement into and out of engagement with said shoulder, and keyoperated means normally holding the locking member in locking position but capable of being disengaged by the operation of a key.

3. A padlock according to claim 1 wherein the means for locking said disc in said second position comprises a locking member, a rotatable disc beingformed with a notch providing a shoulder, said locking member being mounted in said housing to move into and out of engagement with said shoulder and being a part of the cylinder of a pin and tumble lock mounted for rotation in a bore in said housing 4. A padlock according to claim 1 wherein the rotatable disc is formed with a notch providing a shoulder for coaction with the cylinder of a pin and tumbler lock mounted for rotation in a bore in said housing, said cylinder and shoulder constituting the means for locking said disc in said second position, said cylinder being semi-cylindrical at the end that coacts with said shoulder and the part of the rotatable disc that provides the shoulder being formed with a recess which is in registry With the semi-cylindrical end of the cylinder so as to permit rotation of the disc when the cylinder is out of locking position.

LEONARD WEARE YOUNG.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS 10 Number Name Date 1,490,453 Caldwell Apr. 15, 1924 1,922,897 Mahindra Aug. 15, 1933 FOREIGN PATENTS 15 Number Country Date 264,345 Germany Sept. 23, 1913

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