US2141748A - Padlock - Google Patents

Description

Patented Dec. 27, 1938 PATENT OFFICE PADLOCK Henry Hansen, Chicago, Ill., assgnor to Chicago Lock Company, Chicago, Ill., a corporation of Illinois Application October 5,

3 Claims.

The present invention relates generally to padlocks. More particularly the invention relates to that type or variety of padlock which comprises as the main or essential elements thereof (l) a 5 casing having a pair of shackle receiving bores extending through the top face thereof and embodying a third bore of larger diameter extending through its bottom face and intersecting one of the shackle bores; (2) a longitudinally slid- 10 able U-shaped shackle, having a long leg which is slidably and rotatably mounted in the other shackle bore and a short leg which is adapted in response to inward shift or" the shackle into a locked position to t within the one shackle bore; (3) a key-operable tumbler equipped plug which is rotatably mounted in the lower end of the large bore and is shiftable from a locked position into a padlock unlocking position; and (4) a plug controlled locking bolt which is rotatably mounted in the inner end of the large bore and embodies means for securing the short leg of the shackle within said one shackle bore and thus holding the shackle in its locked position.

One object of the invention is to provide a pad- 25 lock of the type under consideration which includes a bolt controlled locking pin for securing the long leg of the shackle against axial displacement in its bore when the shackle is in its locked position.

Another object of the invention is to provide a padlock of the last mentioned character in which the locking bolt is urged into its locking position by a spring and is operatively connected to the key-operable tumbler equipped plug by way of a lost motion lug and groove connection which permits the plug to be rotated into its unlocked position independently of the locking bolt after shift of the bolt into its unlocked position, and the locking pin for locking the long leg of the 40 shackle against axial movement in its bore when the shackle is in its locked position serves additionally to limit outward sliding movement of the long leg of the shackle and also to hold the bolt in its unlocked position'while the shackle is in its unlocked position.

A further object of the invention is to provide va padlock which is generally of new and improved construction, consists of but a small number of parts and may be manufactured at a low and reasonable cost.

Other objects of the invention and the various advantages and characteristics of the present padlock will be apparent from a lconsideration of the following detailed description.

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by claims at the kconclusion hereof.

inthe drawing which accompanies vand forms Aa part of this specification or disclosure and'in 1936, Serial No. 104,005

(Cl. l- 38) which like numerals of reference denote corresponding parts throughout the several views:

Fig-ure 1 is a vertical longitudinal sectional view of a padlock embodying the invention;

Figure `2 is a transverse sectional View on the line `2 2 or Figure l;

Figure 3 is a vertical longitudinal sectional View showing the shackle, the locking bolt, and the plug in their unlocked posi-tions;

Figure 4 is a transverse sectional .View taken on the line 4--4 of Figure 3 and showing the manner in which the locking pin serves when the shackle is in its unlocked position to retain the locking bolt in its unlocked position;

Figure 5 is a transverse sectional View taken on the line 5-5 of Figure 3 and showing the construction and arrangement of the spring-pressed holding or retaining device for the key-operable tumbler equipped plug;

Figure -6 is a vertical transverse sectional view on the line 6 6 oi Figure l; and

Figure 7 is a perspective of the locking bolt and plug,

The padlock which is shown in the drawing constitutes the preferred embodiment of the invention. It is adapted for general padlock use and comprises a casing 8, and a shackle 9. 'Ihe shackle, as shown in the drawing, is U-shaped and comprises a short leg I Il and a long leg II. .The body 8 is in the form of a die-casting and has a flat top face I2 and a flat bottom face i3. It is laterally elongated, as shown in Figures 2, 4 and 5, and has in addition to the flat top and bottom faces I2 and I3 three bores I, I5 and I6. The bore -I-ll is `formed in one side of the casing 8 and serves as a mounting or journal for a lock plug I 'I and a locking bolt I 8. It is of uniform diameter from one end thereof to the other and extends from a point beneath the top face l2 of the casing to and through the bottom face I3. vThe plug I"I is located in the lower portion of the bore I4 and-the locking bolt I8 is disposed above the plug and iits within the upper portion of said bore I4. The bore I5 is formed in the same side `of the casing 8 as the bore I4. It is adapted to receive the short leg I0 of the shackle 9 when the shackle is in its locked position and is smaller in diameter than, and is located outwardly of, the bore I4. As shown in Figure 3, the bore I5 extends downwards from the flat top face I2 of the casing 8 and intersects the upper outer portion .of the -bore I4. 'I'he bore IS is formed in the other side of the casing 8 of the padlock and extends downwards from the flat top face I2 to a point directly above the bottom face I3 `of the casing. It is the same in diameter yas the bore I5 andforms a bearing in which the long leg II of the shackle 9 is slidable longitudinally as well as rotatable. A compression Spring I9 is disposed in the lower end of the borev I5 and loperates when the locking bolt I8 is rotated by the plug l? into its shackle releasing position, as hereinafter described, to shift the shackle upwards into its unlocked position. In this position of the shackle the short leg 3 is disposed above the top face I2Vof the casing, as shown in Figure 3,' and the shackle isY free'toV swing sidewise about the axis of the long leg Ii. A locking pin 2li serves to retain the lower end of the long leg I l of the shackle within'the upper end of the bore l5 when the shackle is shifted by the spring i9 into its unlocked position. This pin 2@ is slidaele longitudinally in a horizontally extending bore 2i in the upper portion cf the casing As shown in the drawing, the bore 2l extends between and intersects the upper ends or the bores I-'l and i5.

The plug I1 has a longitudinal slot 22 for a key 23 and is provided at its lower or exposed end with a head 24. VThe latter is substantially iiushV with the bottom face I3 of the casing 8 and nts within an annular recess 25 around the lower end of the bore I4. 'Ihe'plug is locked against rotation in the casing 8 by means of a set of key operable plate tumblers 2,6. The latter are mounted in a U-shaped frame 21 so that they are slidable transversely with respect to the plug. The frame 2l ts snugly in a transverse socket 28 in the central portion of the plug I1 and is similar in design and construction to that which is shown in United States Letters Patent No. 1,644,092. A springV (not shown) is associated with the frame and operates in conjunction with laterally projecting lugs on the tumblers to force the tumblers outwardly in opposite directions Vand so that the end parts thereof are normally disposed in apair ofgrooves 29 and 3U. The latter are positioned diametrically opposite one another and extend along and lengthwise of the boreY I4. The groove 29 is located in the central portion of the casing 8 and extends upwards from the recess 25 to a point beneath the horizontally extending bore 2| for the longitudinally slidable locking pin 28. The groove 30 extends upwards from the annular recess 25 and the upper end thereof intersects the bottom or lower end of the bore I5 for the short leg I0 of the shackle. When the keyV 23 is inserted through the key slot 22 the tumblers 26 are shiftedso that the end parts thereof are withdrawn fromV the longitudinal grooves 29 and 30. VWhile the tumblers are in this position the plug is free so that it may be rotated 90 by the key 23 from a locked position (see Figure 1) into an unlocked position (see Figure 3). Upon return of the plug to its locked Y position and removal of the key from the key slot the aforementioned spring which is associated with the frame 2l forces the tumblers into locked relation with the grooves 29 and 30 and thus prevents rotation of the plug relatively to the casing. Rotation or turning of the plug in excess of 90 is prevented by means of a lug 3l which is formed integrally with the padlock casing 8. As shownY in Figure 6,V this lug 3l is disposed in the inner portion of the annular recess 25 and fits within an arcuate groove 32 in the Vupper or inner portion of the plug'head 24. Whenthe plug is in its unlocked position, as shown in Figure 3, the key cannot be removedV from the key slot 22 due to theV fact that the tumblers are in alignment as far as the end parts thereof Yare concerned and cannot slide transversely of the plug due to the contact o'ftheir ends with the Vperiphery of the bore i4. To remove the key fromY the plug it is necessary to rotate the plug intoV its locked Vposi- Y tion. The plug is held against axial displacement in the bore Ill by means of a crescentshaped holdingdevice 33. This device as shown in Figure 5, ts within anannular groove 34 in the inner end of the plug II and is urged outwards by means of a compression spring 35 into a position wherein the outer margin of the central part thereof is disposed in an annular groove 35 around the central portion of the bore I4. The spring 35 iits within a hole 31 in the lug I7 and surrounds an inwardly extending stem 3B on Vthe holding devicer33. The stem fits within the Vhole 3l andcauses the holding device to rotate with the plug. It is formed as an integral part of the device and is disposed directly opposite to the groove 30 when the plug is in its unlocked position. In order to remove the plug I1 from the bore I4 it is only necessary to bring the plug and shackle into their interlocked positions and then insert a pin (see Figure 3) through the bore I5 into the upper end of the tumbler receiving groove 30. When the pin is in this position it may be manipulated so as to force the holding device 33 inwards into a position wherein the outer margin of the central part thereof is disengaged with respect to the annular groove 36 around the bore. After shift of the holding device into such a position theV plug is free so that it may be removed from the bore I4. By having the upper end of the groove 30 intersect the bore I5 ready access to the holding device 33 may be had through the bore I5 for plug releasing purposes when the'sha'ckle is in its unlocked position. The holding device because of its location or arrangement on the plug I'I can only be released when the plug is in its unlocked position. In this p'osition of the plug the key is held in fixed relation with the plug due to locking of the tumblers,

Y as previously pointed out, and serves as a handle whereby the plug may be readily pulled from the bore upon release of the device. the fact that access to the holding device 33 can only'be had via the bore I5, it is impossible to release the device and thus free the plug when the shackle is in its locked position. The enlarged head 24 at the lower end of the plug I'I serves as a closure for the lower end ofthe tumbler receiving groove 30 and prevents access to theholding device via the lower end of the groove 30. The holding device 33 exemplifies means accessible via the bore I5 for releasably holding the plug I1 against axial displacement in the bore I4.

The lockingrbolt I8 is controlled by the keyoperable lock plug` I'I and constitutes the means by which the shackle is held Vor lockedY in its locked position with the short 'leg l0 thereof in the bore I5. -It is rotatably mounted in the upper end of the bore I4 and embodies an arcuate cut-out 39 and a lock dog 40 over the cut-out.

The dog, as shown Yin Figure 1, ts within a notch 4I inrtherlower endof the short leg I0 of the shackle when theshackle and locking bolt are in theirlocked positions, and locks `the Vshort leg of theV shackle'in the boreV I5.V The notch 4I is spaced a slight distance above the extreme lower end of the short leg of the shackle and faces in the direction of the bore I4. The cut-out 39 extends substantially half-way around the bolt and accommodates and forms a pocket Vfor the extreme Ylower end of the short Vleg of the shackle Vwhen the locking bolt Vand shackle are in their locked positionV and the dog 48 is in interlocked relation with the notch 4I. The dog ll is in the, form of a flange andhas a .notch 42 in one end thereof. This notch leads tothe cut-out 39 and ,40 In View of is adapted when the locking bolt is rotated by the key operable lock plug I'I into its unlocked position (see Figures Sand 4) to register with the'bore I5 and releases the short leg of the shackle so that it is free to move out of said bore. When the short leg of the shackle is in the bore I5 and the locking bolt is rotated into its locked position the dog 40 moves into the notch 4I and effects an interlocking connection whereby the shackle is secured in place. When the locking bolt is rotated into its unlocked position the dogl 40 rotates out of interlocked relation with the notch 4I and the notch 42 is brought into registry with the bore I5. Upon registry of the notch 42 with the bore the short leg of the shackle is free, as previously pointed out, so that it may move out of the bore I5. The upper end of the locking bolt I8 has a cylindrical socket 43 for a cylindrical stud 44. The latter is formed as an integral part of the padlock casing 8. It is disposed in the extreme upper end of the bore I4 and forms an auxiliary bearing for the locking bolt. The lower end of the bolt, as shown in Figure 6, has a cylindrical socket 45 for a cylindrical stud 45 on the upper or inner end: of the key-operable lock plug I l. The stud 45 is formed as an integral part of, and is centrally positioned with respect to, the upper end of the plug and forms an intertting connection with the socket 43 whereby the plug and locking bolt are held in axial alignment and against transverse displacement one with respect to the other. The plug is connected to rotate the locking bolt i8 into its unlocked position by means of a lug 41. 'Ihis lug is formed integrally with, and projects upwardly from, the upper end of the plug Il. It is located outwardly of the stud 4S and fits within Van arcuate groove 48 in the lower end of the locking bolt I8. The lower end of the locking bolt embodies an integral shoulder forming abutment 49 which denes one end of the groove 48. When the plug and locking bolt are in their locked positions the lug 41 abuts against the abutment 49, asshown in Figure 7, and a driving connection is formed between the plug and the bolt whereby the locking bolt is caused positively to rotate into its unlocked position when the plug is turned by the key into its unlocked position. The groove 48 extends throughout an arc of approximately 180 and forms with the lug 41a lost motion connection whereby the plug may be returned to its locked position independently of the locking bolt. A coil spring 50 serves to rotate the locking bolt I8 into its locked position when the latter, as hereinafter described, is released by the locking pin 20. This spring fits within an annular groove 5I in the lower end of the locking bolt. The groove, as shown in Figures 1, 3 and 6, is disposed directly above the groove 48 into which projects the lug 41 on the upper end of the key operable lock plug Il. One end of the spring 50 is anchored in a hole 52 in the plug and the other end of the spring projects radially outwards and iits within the upper end of the tumbler receiving groove 29 in the central portion of the padlock casing 8.

The lock pin 2!) has a three-fold purpose. First, it serves to limit outward movement of the long leg Il of the shackle when the shackle is in its unlocked position, second, it serves when the shackle is in its unlocked position, as shown in Figure 3, to lock the locking bolt I8 against return to its locked position by the spring and third, it operates when the shackle and locking bolt are in their locked positions to lock the vnotch long leg of the shackle in the bore I 6. The inner end of the pin 20 is rounded and engages the outer periphery at the upper end of the locking plug. 'Ihe outer end of the pin is rounded also and projects into the bore I6. The long leg Il of the shackle 9 has a notch 53 for receiving the outer end of the pin 20 when the shackle is in its locked position and has an annular groove 54 for receiving the outer end of the lock pin when the shackle is in its unlocked position. The groove 54 is formed in the lower end of the short leg II of the shackle and is aligned with the horizontally extending bore 2| when the shackle is in its unlocked position. The notch 53 is located a short distance above the groove 54 and registers with the bore 2l when the shackle is in its locked position. It faces the notch 4I for the lock dog 49 and communicates with the groove 54 by Way of a channel 55. The latter is cornparatively shallow and is of less depth than the 53. When the shackle is in its locked position, as shown in Figure l, the inner end of the lock pin 2D abuts against the upper end of the locking bolt I8 and the outer end of the pin and ts and seats within the notch 53 and locks the long leg of the shackle in the bore I5. The upper end of the locking bolt has a longitudinally extending comparatively shallow groove 55. This Ygroove is adapted when the locking bolt is turned into its unlocked position to register with the inner end of the bore 2| and permits the lock pin to move inwards until the outer end thereof is disengaged from the notch 53 and releases the leg II so that it is free to move upwards in response to the action of the compression spring I9. When the spring I9 shifts the long leg l I of the shackle upwards after release of the leg by inward movement of the pin 20 the outer end of the pin rst traverses the channel 55 and then enters the groove 54 in the lower end of the long leg II. The depth of the groove 54 is such that when the shackle is in its unlocked position the locking pin is held with the inner end thereof in the groove 56 and the locking bolt is thus locked against shift into its locked position by the spring 50. By reason of the fact that the groove 54 is an annular one the shackle is free when in its unlocked position to swing laterally about the axis of the long leg II. 'I'he lower end of the notch 53 is curved so as to define a cam surface 51 leading to the upper end of the channel 55. When the locking bolt I8 is shifted into its unlocked position and the groove 56 is thus brought into registry with the inner end of the bore 2| this cam surface 5l in response to the action of the spring I9 moves the pin 20 inwards until the inner end thereof is in the groove 55 and its outer end is disengaged with or free from the notch 53.

When the padlock is in its locked position the lock dog 40 is disposed in the notch 4I and the lock pin 20 is interlocked with the groove 53 with the result that both legs of the shackle are held fixed or locked relation in their respective bores in the casing 8. When it is desired to unlock the padlock it is only necessary to insert the key 33 into the key slot 22 of the lock plug Il and then turn the key so as to rotate the plug into its unlocked position. When the key is inserted into the key slot the outer ends of the tumblers 25 are withdrawn from the grooves 25 and 36. As soon as the ends of the tumblers are withdrawn from the groove the plug is free so that it may be turned into its unlocked position. When the plug is turned into its unlocked position the locking bolt I8 as the result of the driving connection that is alforded by the lug 41 kand the shoulder forming abutment 49 is turned into its unlocked position. As soon as the lock dog i0 is disengaged from the notch 4| and the groove 56Vis aligned with the bore 2l during turning of the locking bolt into its unlocked position thershackle is released with the result that the spring I9 forces it upwards intro its unlocked position. During bore l5 and the lower end of therlongV leg of the leases the locking bolt i8 the spring 5G rotates theV locking bolt into its locked position wherein the lock dog d@ fits within the notch fil. Y If it is Vdersired to remove the lock plug l1 from the padlock casing ii for tumbler changing purposes or for any otherrreason, it is only necessary to unlock the padlock and then after swinging the shackle laterally so as to bring the short leg i9 thereof out of registry with the bore l to insert a pin through the bore and the tumbler receiving groove 35i into a position wherein it releases the crescent shaped holding device 30. i 4

The herein described padlock consists of but a comparatively small number of parts and hence may be manufactured at a low and reasonable cost. It is extremely eicient as far as operation is concerned by reason of the fact that it includes the lock pin 2KB which serves as a locking means for the'long leg of the shackle.

The invention is not'to Vbe understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent is: Y

1. A padlock comprising in combination a casing having a pair of shackle receiving bores eX- tending through the top face thereof and also having a third bore extending through its bottom face and intersecting one of the shackle bores and a cross-bore between and communicating with the upper end of the third bore andthe other shackle bore, a longitudinally slidable U- shaped shackle having a long leg slidably and rotatably mounted in said other shackle bore and a short leg adapted in response Vto inward shift of the shackle from an unlocked position into a locked position to fit within said one shackle bore, a locking bolt rotatably mounted in the upper'end of the third bore and adapted to be shifted from a locked position wherein it is interlocked with the short leg of the shackle into an unlocked position wherein such short leg is released, a locking pin slidably mounted in the cross-bore and shift- Y able outwards by the bolt into interlocked relation Y AsV with the long leg of the shackle when the shackle is in its locked position andthe bolt is turned into its locked position, and a key-operable turnbler equipped plug mounted rotatably in the lower end of the third bore and connected to rotate the bolt into its unlocked position.

2. A padlock comprising in combination a casing having a pair of shackle receiving bores extending through Ythe topV face thereof and also having a third bore extending through its bottomV faceV and intersecting one of the shackle bores and a cross-bore between andcommunicating with the upper 'end of the third bore and the other shackle bore, a longitudinally slidable U-shaped shacklerhaving a long leg slidably and rotatably mounted in said other shackle bore and a short leg adapted in response to inward shift of the shackle from an unlocked position into a locked positionV to t within said one shackle bore, a locking bolt rotatably mounted in the upper end of the third bore andY adapted to be rotated from a locked position wherein it is interlocked with the short leg of the shackle into an unlocked position wherein such short leg is released, a spring Yfor rotating the bolt into its locked position, a longitudinally slidable pin in the cross-bore, and shiftable outwards by the bolt into interlocking relation with the long leg of the shackle when theV shackle is in its locked position and the bolt is rotated into its locked position, and so controlled by said long leg of the shackle that when the shackle is in its unlocked position it holds the bolt in its unlocked position against the force of the spring, and a key-operable tumbler equipped plug mounted rotatably inthe Vlower end of th-e third bore and connected to rotate the boit into its unlocked position.

3. A padlock comprising in combination a casing having a pair of shackle receiving bores extending through the top face thereof and also havingl a third bor-e extending through its bottom face'` and intersecting one of thershackle bores and a cross-bore between and communicating with the upper end of the third bore and the other shackle bore, a longitudinally c:,'idable YU-shaped shackle having a longV leg slidably and rotatably mounted in said other shackle bore and a short leg adapted in response to inward shift of the shackle from an unlocked position into a locked position to t within said one shackle bore, a rotatable locking bolt in the upper end of the third bore adaptedto be shifted from a locked position wherein it is interlocked with the short leg of the shackle into an unlocked position where- Vin such short leg is released and having a peripheral groove therein adapted to registerA with the cross-bore when thebolt is in its unlocked position, a spring for rotating the Ylocking bolt into its locked position, a longitudinally slidable locking pin in the cross-bore shiftable outwards by the bolt into interlocking relation with the long leg ofthe shackle when the shackl-e is in its locked position and the bolt is turned into its locked position by the spring, and controlled by the long fleg of the shackle in such manner that when the bolt is turned into its unlocked position and the shackle is moved into its unlocked position it is shifted inwards into the groove in the plug and operates to hold the plug against return to its Vlocked position by the spring, and a key-operable

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