US 3783657 A
To provide a metallic protector for substantially enveloping the major exposed portion of a retracted and locked padlock shackle an eccentrically shaped guard is affixed to the end portion of the padlock body in covering relation to the normally exposed portion of the shackle. The outer end of the guard is slotted so that when the shackle is unlocked and reciprocated outwardly for staple eye engaging or releasing purposes, it will freely move outwardly through the slotted end of the guard while the guard remains immovably affixed to the padlock body.
Description (OCR text may contain errors)
United States Patent Foote Jan. 8, 1974  PADLOCK BODY AFFXED SHACKLE FOREIGN PATENTS OR APPLICATIONS ENVELOPING GUARD 306,948 7/1918 Germany 70/52  Inventor: Daniel J. Foote, Wauwatosa, Wis. 381,399 9/1923 Germany 70/52 4  Assignee: Master Lock Company, Milwaukee, 411634 m9 7 Italy 70,52 Primary Examine rRobert L. Wolfe  Filed: Oct. 16, 1972 Att0meyCurtis B. Morsell, Sr.
 Appl. No.: 297,714 ABSTRACT To provide a metallic protector for substantially enveli i oping the major exposed portion of a retracted and  d 705; 55 56 52 locked padlock shackle an eccentrically shaped guard le 0 $87; c 5 7 is affixed to the end portion of the padlock body in covering relation to the normally exposed portion of R f d the shackle. The outer end of the guard is slotted so e erences that when the shackle is unlocked and reciprocated UNITED STATES PATENTS outwardly for staple eye engaging or releasing pur- 1,566,473 12/1925 Gibson 70/52 X poses, it will freely move outwardly through the slot- 3,475,931 11/1969 Foote 70/54 ted end of the guard while the guard remains immov- 2,541,638 2/1951 Clevett 70/56 ably ffi d to the padlock body, 3,638,460 2 1972 Berry 70/52 0 3,721,112 3/1973 Wellekens 70/39 7 Claims, 7 Drawing Figures 3 4 2 I I l3 1 l n [7 I3 I I 5; I I I I 2 i 2 O I I O 2 4 2 5 g I I5 i i PATENTEQJAN 81974 3.783.657
sum 1 0r 2 Eli-1 PADLOCK BODY AFFIXED SHACKLE ENVELOPING GUARD BACKGROUND OF INVENTION AND ITS OBJECTIVES Burglars and thieves have for many years used various methods of attack on padlocks in attempts to gain entry to buildings or closures, which are padlock protected, with the intent of stealing personal property or valuables housed within such closures. Padlock manufacturers, consequently, have striven to make their locks stronger and-tamper-proof, but the shackle has often, heretofore, proven to be one of the most vulnerable points of attack. Pursuant to the present invention the improved shackle enveloping guard functions to protect the locked and retracted padlock shackle and render it invulnerable to the surrepticious application thereto of a saw, cutter, pry or the like by a thief or tamperer.
As a further objective the invention aims at the provision of a padlock shackle enveloping guard in which a notch is provided, accessible when the shackle is unlocked and projected outwardly to free the short leg of the shackle from the padlock body, for the engagement with the short leg of the shackle and its ultimate accommodation thereby, of an eye, hook or hasp element projecting from the closure to be locked.
Another object of the invention is to provide a shackle enveloping guard which is affixed to the padlock body and relatively freely movably envelopes the shackle, and is so constructed that the outer end portion of the shackle may reciprocate through the outer end of the guard when the shackle is unlocked and is reciprocated outwardly by spring urged means.
A further object of the invention is to provide a padlock body affixed shackle enveloping guard which does not require pivoting of the shackle for hasp-eye engaging and disengaging purposes, but permits reciprocation of the shackle relative to the padlock body and the body affixed guard.
Still another object of the invention is to provide a padlock shackle guard which adds to the sturdy and heavy appearance of the padlock assemblage and serves 'to warn thieves or temperers that such padlock willresist their attempts to sever or pry the shackle or release the padlock. I
Other objects of the invention are to provide a pad lock shackle enveloping guard which is easily permanently affixed to a padlock body, which is simple in design and construction, which is easy to manipulate, which is relatively inexpensive, and which-naturally enhances the safety features of the padlock shackle with which it is associated.
DESCRIPTION OF THE PRIOR ART As far as applicant is aware there is nothing presently available which is similar in major respects to the present improved padlock body affixed shackle enveloping guard. The R. L. Owen et al. U.S. Pat. No. 3,453,846, owned by applicants assignee discloses a shackle guard which is affixed to & moves with the shackle, which is also true of the shackle guard disclosed in the Beaver U.S. Pat. No. 3,392,555.
BRIEF DESCRIPTION OF THE DRAWINGS In the drawings wherein the same reference characters indicate the same or similar parts in all of the views:
FIG. 1 is a vertical sectional view of a shackleequipped padlock wherein the body of the padlock fixedly carries a shackle enveloping guard, the shackle being shown retracted and locked onto a hasp element or the like;
FIG. 2 is afront view of the padlock and guard assemblage with the shackle unlocked and in its outwardly projected position wherein the disengaged short leg of the shackle may be engaged with or disengaged from a hasp element or the like;
FIG. 3 is a plan view of the padlock and guard assemblage with the shackle in its retracted and locked condition;
FIG. 4 is a bottom view of the assemblage with the key removed;
FIG. 5 is a side view of the assemblage looking at the open mouth of the guard;
FIG. 6 is a front and side perspective view of the guard disassociated from the padlock; and
FIG. 7 is a bottom view thereof.
DESCRIPTION OF THE PREFERRED EMPEDIMENT Referring now more particularly to the'drawings, it will appear that a padlock body (illustrated as being laminated, although this is not necessary) is indicated generally by the numeral 10. As is standard, said body has projecting from an end thereof a shackle designated generally by the numeral 11. The shackle is slightly modified from standard practice in that it's long leg 12 which reciprocates in a bore 13 therefor in the padlock body, is longer than normal so that in the retracted position of the shackle, as in FIG. 1, the inner end of the long leg extends into a cup-like thimble l4 rigidly carried by the bottom plates 15 and 15' of the body. Said thimble 14, in the retracted position of the shackle, also houses the contracted lower end portion of a coiled spring 16. This spring extends through an opening 20 therefor in said shackle long leg to react against an upper internal portion of said leg in a manner to reciprocate the shackle outwardly from the opposite end of the padlock body (see FIG. 2) when the padlock locking levers 17 and 18 are operated by the associated key controlled mechanism 21 to release both of the shackle legs. This arrangement permits the shackle to reciprocate somewhat longer than normal from the outer end of the padlock body, substantially lifting the free end of the short leg 22 of the shackle beyond its end of the body and out of its bore 13 is to provide a substantial gap for engaging a hasp element 19 or eye with said short leg, or disengaging it therefrom.
As is best shown in FIG. 1 the upper end portion of the hollow thimble 14 has a force fit within openings therefor in the plates 15 and 15' of the padlock body 10. Additionally the extreme bottom plate 15 during assembly, may be bumped into a recess 23 therefor in a wall of the thimble with the body lamination 15' thereabove, on its side adjacent the body cavity for the long leg, being recessed, as at 24, to receive the shoulder 25 on the upper end of the thimble.
The locking levers 17 and 18 and the means for engaging the same with notches in the shackle legs 12 and 22 is of the dual locking lever type similar to that shown in the Foote US. Pat. No. 3,475,930 of Nov. 4, 1969. As shown in said patent the cylinder 26 has a bottom key slot 27 to removably receive an operating key 28. In this connection it should be observed that an exterior bottom portion of the thimble 14 is recessed, as at 29, to provide clearance for the head of the inserted key 28 when the latter is turned.
The improved shackle guard is indicated generally by the numeral 30. As shown most clearly in FIG. 6 it is helmet shaped with the major interior thereof being solid as at 36, and being formed on its curved top with an outwardly opening arcuate groove or recess 31 whose opposite inner end portions merge into shackle leg bores 32 and 32' which open through bottom wall portions of the solid interior of the guard. The right hand side of the guard (relative to FIGS. 1, 2 and 6) is provided with an inwardly extending mouth 33 which exposes a portion of the short leg 22 of the shackle in the retracted position of the latter and accommodates a shackle leg-engaged hasp element 19 or the like, as in FIG. 1. Or it provides the clearance gap for the disengagement from or initial engagement with the hasp element when the shackle is in its projected position of FIG. 2. Below the solid interior portion of the guard 30 there is a depending three-sided skirt 34 of a size to clampingly embrace portions of the upper front and rear faces and the left hand side (as viewed in FIGS. 1, 2 and 4 of the drawings) of the padlock body, said skirt terminating short of the right hand end of the padlock body. The front and rear walls of the skirt are slightly angled as 35, to conform to the angularity of the corresponding walls of the padlock body. In the face of the bottom of the solid interior 36 of the guard there are spaced recesses 37 to accommodate the heads of those body rivets 38-which the guard portion 36 overlies.
When the improved guard 30 is permanently mounted on the shackle end of the padlock body the relationship is as shown in FIGS. 1, 2 and 5. The skirt portion of the guard has a force fit onto the previously mentioned upper portions of the body 10. Additionally, if desired, any suitable means may be employed for effecting a permanent bondage as between the guard and the shackle end portion of the padlock body. When the shackle 11 is retracted its curved outer end seats snugly in the arcuate recess 31 in the outer end of the guard. All portions of the long leg of the shackle are housed in the body bore 13 and the guard bore 32. The only exposed portion of the short leg of the shackle is, when the assembly is in service, surrounded by the hasp element or eye 19 with the latter substantially filling the guard mouth 33.
It should be obvious from what has been said heretofore that when the shackle ll of the improved padlock and guard assemblage is unlocked and in its position of upward reciprocation depicted in FIG. 2, the mouth of the guard 30 is completely open and accessible due to the fact that the short leg 22 of the shackle has been lifted free of the padlock body and the guard mouth. In this position the padlock shackle may be engaged with an eye, hasp element or other part of a device to be locked with the eye or hasp element being pushed into the guard mouth 33. Then, the shackle is pushed to its inwardly reciprocated position wherein it may be locked by the engagement of the ends of the locking levers 17 and 18 with the shackle leg notches. The short leg of the shackle passes through the usual opening or eye in the element of the device to be locked. In the locked and hasp element engaging position of FIG. 1 the shackle is fully protected against the application of tools such as a tamperer might use in an attempt to pry, distort or saw the shackle. To release the padlock assemblage from the locked element it is merely necessary to unlock the locking mechanism through movement of the key 28, whereupon the spring 16 will automatically project the shackle to its outwardly reciprocated position illustrated in FIG. 2, permitting the dis engagement of the hasp element 19. It should be observed that during the reciprocatory movements of the shackle 11 relative to the padlock body 10 the shackle legs move freely through the bores 32 and 32 provided therefore in the guard 30. Also the curved, closed outer end of the shackle moves from its seated position within the guard groove 31 to the projected position and vice versa. The guard 30 is permanently attached to the padlock body so that the shackle is free to reciprocate relative thereto but does not pivot, pivotal movement being unnecessary.
From the foregoing detailed description it will be seen that the present invention provides a padlock body affixed shackle enveloping guard that will effectively prevent the unauthorized opening of the padlock shackle, thereby enhancing the safety features of the padlock and making the same relatively tamper-proof. The guard does not interefer with the normal operation and functioning of the padlock to which it is applied and is applicable to padlocks of various types, sizes and styles including key actuated padlocks or permutation padlocks. The guard is free of manufacturing complications, is easily permanently mounted on a portion of the padlock body, is of simple and strong construction, and is well adapted for the intended purposes.
What is claimed is:
1. In combination: a padlock body having first and second ends; a lockable shackle reciprocatably carried by the body and projecting from the first end thereof, said shackle having a pair of legs, both of which are extended into the padlock body when the shackle is in its inwardly reciprocated position; a thimble carried by and projecting beyond the second end of the body and in alignment with one of the legs of the shackle; and means extending into said thimble and reacting against one of the legs of the shackle to automatically reciprocate the shackle outwardly when it is unlocked.
2. The combination recited in claim 1 wherein one of the shackle legs is a short leg and the other shackle leg is a long leg with the means which extend into the thimble reacting against the long leg of the shackle which is in alignment with said thimble.
3. The combination recited in claim 2 wherein when the shackle is retracted the extremity of the long leg is accommodated by said thimble.
rocate while the guard remains affixed to the body.
6. The combination recited in claim 5 wherein one of the legs of the shackle is a short leg which moves free of the body when the shackle is unlocked and reciprocated outwardly and the guard has a mouth therein registering with the freed short leg of the shackle when the shackle is in its unlocked, outwardly reciprocated position.
7. In combination: a padlock body having first and second ends; a U-shaped shackle extending reciprocatably into the padlock body and including a short leg reciprocatable free of the first end of the body and a long leg which, when the shackle is in its retracted position extends beyond the second end of the body; means housed within the body for locking the shackle in its retracted position; a guard secured at its inner end portion to the first end of the body and substantially enveloping the shackle when the latter is in its retracted position, said guard being formed with openings wherein portions of the shackle are protectively lodged when the shackle is in its retracted position but permitting outward projections of the shackle relative to the first end of the body and the anchored guard when the shackle locking means is released, the guard, in a side portion thereof adjacent the short leg of the shackle,
the latter is unlocked.