US2105337A - Permutation padlock - Google Patents

Description

Jan. 11, 1938. u H E, SQREF ET AL 2,105,337

PEHMUTATION PADLOCK Filed Feb. 4, 1937 FIG. Z

ATTORNEY Patented Jan. 1l, 1938 UNITED STATES PATENT OFFICE PERMUTATION PADLOCK consin Application February 4, 1937, Serial No. 123,998

9 Claims.

The invention relates to locks and more particularly to permutation padlocks.

An object of the invention is to provide an improved and simplified permutation padlock wherein the shackle is automatically locked upon its entry into the lock case.

Another object of the invention is to provide a padlock in which the tumbler permutation is automatically upset or disarranged upon the entry of the shackle into the lock case.

Y A further object is to pro-vide a padlock which is reliable in operation and is capable of economical manufacture.

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

One specic embodiment of the invention is shown in the accompanying drawing, wherein Fig. 1 is a rear view of a permutation padlock constructed in accordance with the invention, parts being removed and'broken away and parts being shown in section, the padlock being shown in locked condition;

Fig. 2 is a sectional View of the padlock taken generally along the line 2-2 of Fig. 1;

Fig. 3 is a view similar to Fig. 1, but with additional parts broken away and shown insection, the lock being shown in readiness for withdrawal oi" the shackle;

Fig. 4 is a sectional View taken generally along the line 4-4 of Fig. 1;

Fig. 5 is a view generally similar to Fig. 1, but showing the shackle fully withdrawn;

Fig. 6 is a View similar to Fig. 5, but showing the shackle entered into the lock to locking position;

Fig. 7 is a perspective view of a tumbler-rotating member;

Fig. 8 is a detail perspective view of a latch plunger forming a part of the lock, and

Fig. 9 is a detail perspective view of a shackle guide and stop.

In the drawing, I5 designates a lock case of any suitable shape, and in the present instance of cylindrical form and comprising a front plate IB and an embossed rear plate II, the former plate being integral with the cylindrical portion of the case. The case has an enclosing cupshaped shell I8, preferably a sheet metal stamping, which fits closely on the case and has a front cover plate I9 engaging the front plate I6 of the case. An embossed rear cover plate marginally bears on the rear plate I1, and both of these plates are secured in place by a flange 2l formed by spinning over the rear edge of the shell I8. Preferably, the iront and rear plates I6 and I1 are further secured in place by riveted pins or posts 22 and 23, which also secure the front cover plate I9 of the shell to the front plate I6 of the case.

A guide member 25, preferably in the form of a f sheet metal stamping, is rigidly secured within the case, and comprises a flat portion 26 which rests on the inner face of the front plate I6 and is secured thereto by the riveted pin 23. Struck up from an end of the flat portion 26 of the member is a flange 21 which extends between the iront and rear plates I6 and I1 and is provided with opposite lugs 28 which fit in anchor slots 29 formed in these plates. A round shackle-guiding opening 30 is formed in the iiange 21,

A U-shaped shackle 3| has its legs slidably passing through openings 32 formed in the case and shell. The longer leg of the shackle also slidably and rotatably passes through the opening 3|! in the guide member 25, and the shorter leg has a beveled end 33 and a locking notch 34 near this end. When the shackle is withdrawn to its outermost position, the shorter leg clears the shell I8, as seen in Fig. 5, and the shackle is then capable of being swung about its longer leg. The longer leg of the shackle is .provided with a keyway 35 in which slidably ts a guide tongue 36 struck up from the guide member 25. An annular groove 38 is formed about the end portion of the longer shackle leg and slidably receives therein a forked guide and stop plate 39 which is conned on the shackle leg by the slidable engagement of a straight edge of the plate with the flat inner surface of the case plate I1, this engagement also guiding the shackle leg and preventing rotation of the forked plate with respect to the case. 'Ihe forked plate is engageable with the flange 21 of the guide member 25 to limit the outward movement of the shackle, as seen in Fig. 5. When the shackle is in its outer or withdrawn position, it clears the tongue 36 to permit free swinging of the shackle.

A locking lever 4 I, forming a locking member, is pivotally mounted on the pin 22 and movably carries a spring-pressed latch member, here shown to be in the form of a cylindrical latch plunger 42 slidable in a bore 43 formed in the locking lever at right-angles to the pin 22. The latch plunger has a beveled nose 44 engageable in the shackle notch 34 to resist withdrawal of the shackle when the locking lever is locked, as hereinafter described. A compressed coiled spring 45 within the locking lever extends within the hollow inner end of the latch plunger and urges the latch plunger outwardly. A hat-bottomed notch or recess 46 in one side of the latch plunger receives the pin 22 which thus forms a stop Limiting the outward movement of the latch plunger and also prevents relative rotation of the plunger with respect to the locking lever. An arcuate tongue or lip 41 on the locking lever cooperates with tumbler means hereinafter `described.

A stud 48 is rigidly secured, as by riveting, to an embossed portion of the rear case plate |1 and projects forwardly through apertured portions of the front plate I6 and front cover plate i9. The tapered front end of the stud 48 loosely fits in a bore 49 formed in an operating knob 50 which is rotatably mounted in the front plate I6. A dished dial plate 5| is carried on the knob against relative rotation, the knob having at its inner end a cross slot 53 forming a keyway. The

rim of the dial is surrounded by an annular beadV 54, Fig. 2, which is embossed on the front cover plate i9 of the padlock shell. vThe dialv plate bears the usual indicia, not shown, and conceals the riveted front endsof the pins 22 and 23.

A driving tumbler or disk 55 is concentric and rigid with the knob 5S, as by riveting it on the slotted end of the knob, and `carries the usual transfer lug 56. One or more additional tumblers orfdisks 51 and 58are rotatable on the stud 48 and carry transfer lugs 60. The tumblers are separated by washers 6| which have key projections entering a keyway 52 on the vstud 48 and are placed under friction by a compressed coil spring 63 surroundingthe rear portion of the stud 48. As seen Vin Fig. 2, the keyway 62 stops short of the front end of the stud so as to retain the tumblers 51 and 58 and other parts on kthe'stud prior to the attachment to the case of the stud-carrying rear' plate I1, which thus forms an easily handled sub-assembly.

'I'he tumblers 55, 51 and 58 have peripheral slots or notches 64 formed therein toV admit the tongue 41 of the locking lever when these slots are registered by adjusting the knob 5t, thus permitting the locking lever to be swung tol permit the release of the shackle 3|. The locking lever has a fiat surface 61, Fig. 3, engageable with the peripheries of the tumblers to limit rotation of this lever in one direction during Vclosing of the shackle.

The tumbler 58 is provided with a pin or projection 66 at its rear side engageable by a downwardly projecting arm of a plate-like lever 68 which is pivotally mounted on the pin 22, the lever having a bore 69 to receive the pin. A side of the locking lever 4I is cut away to receive the lever 58 and to form a shoulder or abutmentv16 engageable with the upper edge of the lever 68, this upper edge being cut away at 1| to permit a small relativeangular movement between these two levers. The lever 68 is *confined between the locking lever 4| and the case plate l1. One side edge 12 of the downwardly projecting arm of the lever 68 hasv a concave form to permit rotation of the rearmost tumblerg'which carries the projection 66. forwardly projecting arm 13 which is engageable by the lower end of the short shackle leg to swing the lever, as hereinafter described.

When the padlock is to be opened, the combination knob 50 is turned alternately in opposite directions to successive predetermined positions, thus rotating the tumblers to bring the notches thereof in registered position for admitting the tongue 41 of the locking lever 4|. Fig. 3 shows the lock after the tumblers have been thus ad- The lever 63 has a-Y `amasar justed. During the rotation of the tumbler 58, the projection 66 thereof will displace the lever 5B slightly on its pivotal axis so that the tumbler is free to turn one or more revolutions in either direction, the projection sliding along the concave cam-forming edge 12 of the downwardly projecting arm of the lever. After the tumbler notches are brought into register, the'shackle is displaced outwardly with respect to the lock case, as seen in Fig. 5, the locking lever 4| being tilted by the notched end of the withdrawing shackle, and the lever 68 being tilted with the locking lever. The outward movement of the shackle is limited by the engagement of the forked plate 39 on the shackle with the flange 21 of the guide member 25. In its outermost position the longer leg of the shackle clears the guide tongue 36 Vof the guide member 25, thereby permitting the shackle to be swung in either direction about its longer leg. When the shackle is thus angularly ldisplaced in either direction it can 4not'be moved longitudinally, since the guide tongue 36 isout of register with the keyway 36 in the shackle, thus facilitating manipulation o-f the padlock.

When the padlock is to be locked, the shorter leg of the shackle is re-entered into the case, the beveled end of the shackle leg engaging theV arm 13 of the lever 68, thus moving the lever 68 downwardly. The lever 68, being at its'upper edge engageable with the shoulder 1|) of the lock ing lever lil, swings the locking lever to its normal position, the latch plunger 42 entering the notch 34 of the shackle leg. The lowerend of the lever 68 engages the projection '66 of Ithe tumbler 58, as seen in Fig. 6, thusturning this 'f' tumbler, and in some instances one or both of thertumblers 51 and 55, out of unlocking position, and disarranging the permutation. In'the tumbler-turning or upsetting operation, the shackle is moved inwardly on its locking movement a sho-rt distance past its normal locking position, as seen in Fig. 6.

When the shackle is withdrawn, frictional engagement will hold the levers-4| and 58 inthe angularly displaced positions seen in Fig. y5. In this condition of the lock the shacklemay be returned to its locked position without requiring any yielding of the latch plunger 42. If, however, after the shackle iswithdrawn theqlever 4| should be permitted to return to or nearits normal or locking position the re-entry of the shackle would then cause the latch plunger V42 to yield against the action of its spring 45. The latch plunger spring will be required to operate only infrequently, if at all.

The construction of the padlock is such as to require relatively few parts and tosimplify assembly. For example, the pin 22 connects the front and rear plate of the case, secures the front cover plate of the shell to the front plate of the case, forms a pivot for both the locking lever and combination-upsetting lever, forms a stop for the latch plunger, and prevents rotation of the latch plunger. The forked plate 39 on the shackle forms both a shackle stop and guide and avoids the necessity for riveting or upsetting operations on the shackle after it is inserted in the lock case.

What we claim as new and desire to secure by Letters Patent is:

1. In a permutation padlock, the combination of a shackle, shackle-locking means including a rotatable tumbler movable to release saidshackle, and a shiftably mounted member directly engageable with said tumbler and shackle and disposed in the path of movement of a portion of said shackle to rotate said tumbler out of unlocking position upon the locking movement of said shackle.

2. In a permutation padlock, the combination of a shackle, shackle-locking means including a rotatable tumbler movable to release said shackle, and a pivotally mounted member directly engageable with said tumbler and shackle and disposed in the path of movement' of a portion of said shackle Vto rotate said tumbler out of unlocking position upon the locking movement of said shackle.

3. In a permutation padlock, the combination of a shackle, shackle-locking means including a movable shackle-locking member and a rotatable tumbler movable to release said member out of locking position, and a shiitably mounted member engageable with said tumbler and with said movable shackle-locking member and disposed in the path of movement of a portion of said shackle to move said shackle-locking member to locking position and to rotate said tumbler out of unlocking position upon the locking movement of said shackle.

4. In a permutation padlock, the combination of a shackle, shackle-locking means including a pivotally mounted shackle-locking member and a rotatable tumbler movable to release said member out oi locking position, and a lever coaxial With said shackle-locking member and engageable With said shackle and said tumbler to rotate said tumbler out of unlocking position upon the movement of said shackle.

5. In a permutation padlock, the combination of a shackle, shackle-locking means including a pivotally mounted shackle-locking member and a rotatable tumbler movable to relase said member out of locking position, and a lever coaxial with said shackle-locking member and engageable with said shackle and said tumbler to rotate said tumbler out of unlocking position upon the movement of said shackle, said shackle-locking member and lever being coupled together but capable of a limited relative angular movement.

6. In a permutation lock, the combination of a locking means including a movable locking member, a rotatable tumbler for blocking the unlocking movement of said locking member and movable out of blocking position, a lockable member engageable with said locking means, and a pivotally mounted member directly engageable With said tumbler and lockable member and disposed in the path of movement of a portion of said lockable member to rotate said tumbler out of unlocking position upon the locking movement of said lockable member.

7. In a permutation lock, the combination of a lockable member, locking means including a rotatable tumbler movable to release said lockable member, and a shiftably mounted member directly engageable with said tumbler and lockable member and disposed in the path of movement of a portion of said lockable member to rotate said tumbler out of unlocking position upon the locking movement of said shackle.

8. In a permutation lock, the combination of a lockable member, locking means including a movable locking member and a rotatable tumbler movable to release said member out of locking position, and a shiftabl;T mounted member directly engageable with said tumbler and said locking member and said lockable member to move said locking member to locking position and to rotate said tumbler out of unlocking position upon the locking movement of said lockable member.

9. In a permutation padlock, the combination of a shackle, shackle-locking means including a pivotally mounted shackle-locking member and a rotatable tumbler movable to release said member out of locking position, and a lever coupled with said shackle-locking member and engageable with said shackle and said tumbler to move said member to shackle-locking position and to rotate said tumbler out of unlocking position upon the movement of said shackle.

HARRY E. SOREF. JAMES KEITH MARSHALL.

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