US2040482A - Padlock - Google Patents

Description

y 1936- I A. T. HAGERTY 2,040,482

PADLOCK Filed March 11, 1935 2 Sheets-Sheet 2 Evantor:

Grad/aw T Patented May 12, 1936 PATENT ()FFl CE PADLOCK Andrew T. Hagerty, Elkhart, Ind., assignor to The Adlake Company, a corporation of Illinois Application March 11, 1935, Serial No. 10,354

6 Claims.

The invention relates to padlocks having a plurality of means for holding the shackle closed. For example, see patent to Hamm, No. 1,335,231 of March 30, 1920. The invention has for its principal object to insure that all of those means operate when one of them operates.

Fig. 1 is a side View of the padlock embodying the invention and having one side of the casing removed, and showing the parts in locked position;

Fig. 2. is a vertical section on the line 22 of Fig. 1;

Fig. 3 is similar to Fig. 1, showing the operation of the key in unlocking the shackle with the latter in open position;

Fig. 4 is a perspective view of a key for the lock;

Fig. 5 is a view similar to Fig. 1 showing the tumbler or looking lever at the right held away from the heel of the shackle because the lever, or tumbler, at the left has not yet locked the nose of the shackle;

Fig. 6 is a perspective view of the lever at the right in Fi 5;

Fig. '7 is a perspective view of the lever at the left in Fig. 5; and

Fig. 8 is a view similar to Fig. 5, showing a modified form. V

The lock casing is composed of two sheet metal stampings l0 and assembled with their flanges l2 and I3 held together by five rivets, l4, l5, l6, l1 and I8.

The rivet |4 passes through ears l9 shown in dotted lines in Fig. 1, and forms the hinge pivot for the shackle having a heel 2| always within the casing and a nose 22 adapted to enter the casing through the hole 23, when the shackle is swung from the position shown in Fig. 3 to the locked position shown in Fig. 1.

The nose of the shackle is locked by a bent lever 24 fulcrumed on the rivet 8 and the heel of the shackle is locked by a bent lever 25 fulcrumed on the rivet l5.

The actual locking of the nose 22 of the shackle is done in this instance by what will, for convenience, be called the load arm 26 of the lever 24, which has a hook 21 to enter a slot 28 in the nose and seat against an inclined flat surface 29 at the bottom of the slot.

The other arm 30 of the lever 24 called, for convenience, the power arm, coacts with the key 3|, which is rotated about the key post 32, and has two wards 33 and 34 to bear against the lower sides of the bent levers, as it moves to the position shown in Fig. 3, to unlock the shackle.

The locking of the heel of the shackle is done by load arm 35 on the lever 25, getting into the position shown in Fig. l, and acting as a strut between the heel 2! and the rivet l5.

The power arm 36 of the lever 25 lies alongside the power arm 36 of the lever 24 and bears a pin 31 to cooperate with a shoulder 38 on the power arm 30 to prevent the lever 24 being rotated to the left in Fig. 1 until the lever 25 has been given a preliminary rotation to the right by the action of the ward 34 on the surface 39 of the arm 36.

A spring 40 coiled about the rivet I8 with one end 4| against the casing and the other, 42, hooked about the arm 26, constantly urges the lever 24 to the right, or in a direction to make the hook 21 lock the nose 22 of the shackle.

A similar spring 43 coiled about the rivet l5, and having one end 44 against the casing and the other, 45, hooked about the arm 35, urges the lever 25 to the left, or in a position to make the arm 35 lock the heel 2| of the shackle.

A third spring 46 coiled about the rivet |6, has a long arm 41 that acts on the nose 22 of the shackle and constantly urges it towards open position to the end that when the key operates the bent levers to release the shackle it will automatically fly to open position.

The parts of the casing are most conveniently formed by dies which make them accurate enough for ordinary production of padlocks. The shackle land the two bent levers are usually of brass cast in sand molds, which unavoidably results in some variation at the surfaces that cooperate with other parts in the assembled lock. To overcome this incident in casting, the shackles and levers are given a swaging treatment which, as a rule, serves to correct deformities and bring the parts within customary manufacturing tolerances. However, those tolerances will sometimes accumulate in a way to produce a condition where the heel of the shackle is locked, but the nose is unlocked. This condition is brought about by variations that may, and sometimes do involve the upper end of the arm 35 and the lower surface of the heel 2|, the fiat face 29 on the nose and the point of the hook 21, and also the pin 31, and the upper surface of the arm 30 near the shoulder 38.

The condition of these various surfaces is shown correctly in Figs. 5 and 3, where it will be seen that the arm 35 cannot get into positionbeneath the heel 2| until the point of the hook 21 has entered the slot 28 above the flat face 29 on the shackle.

This result is achieved by building up the top of the arm 36 in the general area marked by 48 and 49 in Figs. 1, 3, 5, '7, and 8, to insure that when the shackle is thrown towards closed position and its nose rocks the bent lever 24 to the left, the built-up portion of the arm 30 of that lever will engage the pin 31 of the arm 36 and hold the arm 7 35 of the lever 25 so far to the right that it cannot lock the heel 2| until the hook 21 moves to the right in locking engagement with the nose 22 of 'the shackle, and thus allows the arm to move downwardly and let the spring 43 throw the arm '35 into locked position underthe heel 2| of the shackle. My new construction thus differs essentially from that of the Hamm device in including parts of the two levers which engage, when the shackle is'being snapped to closed position, to prevent the locking of the heel until the nose is locked.

By comparing Figs. 5 and 7 with Fig. 8, it will be seen that the form in which the upper surface of the arm 30 is built up is somewhat a matter of choice, and the main thing is to preserve a relationship that will enable the lever 24 to prevent the arm from looking the heel of the shackle until the hook 21 has'locked the nose of the shackle. Y

The cooperation between the pin 31 and the,

shoulder 38 is to secure the lever 24 in locked position until the lever 25 has been given a preliminary movement by a proper key. This makes it impossible to pick the lock by well directed blows with the hammer. l

The cooperation between the pin 31 and the built up portion 48 or 49 is to prevent conditions similar to that explained in the description hereinabove of the prior art padlock over which the 1 present invention provides an improvement, and

insures locking by both levers, as shown in Fig. l. 'I claim as my invention:-

1. In a padlock, a casing, a shackle hinged to the casing, and having a heel and a nose, a bent lever within the casing having a load arm bearing a hook for engagement with the nose, of the shackle to lock it, and a power arm, a second bent lever having a load arm for engagement with the heel of the shackle to lock it, andhaving a power arm cooperating with the power arm of the first lever to prevent the load arm of the second lever from locking the shackle until the hook on the first leverhas locked the nose ofthe shackle. 7

3. In a padlock, a casing, a shackle hinged to l the casing, and having a heel and a nose, a bent lever within the casing having a load arm bearing a hook for engagement with the nose of the shackle to lock it, and a power arm, a second bent lever having a load arm for engagement with the heel of the shackle to lock it, and having a power arm cooperating with the power arm of the first lever to hold the load arm of the second leverout of locked position until the hook on the first lever has locked the shackle.

4. In a pa'dlock, a casing, a shackle hinged to the casing, and having a heel and a nose, abents lever having a load arm to lock the noseof the shackle and a power arm, a second bent lever having a load arm to lock the heel of the shackle, and a power arm and a cam on the power arm of the first lever holding the second lever away from locking position until the first lever has locked the shackle. V 5. In a padlock, a casing, a shackle hinged to r the casing, and having a heel and a nose, a bent lever having a load arm to lock the nose of the shackle and a power arm, a second'bent lever having a load arm to lock the heel of the shackle,

and a power arm, and means moved by the power arm of the first lever and acting upon the power arm of the second lever to restrain the second lever from locking the heel of the shackle until the first leverhas locked the nose of the shackle.

6. In a padlock, a casing, a shackle hinged to the casing to swing between locked and unlocked positions, a lever in the casing to hold the shackle in locked position, a second lever in the casing to hold the shackle in locked position, and means actuated by the first lever to restrain the second lever until the first lever is holding the shackle in locked position. 7 I

ANDREW T. HAGERTY.

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