US 3785182 A
A padlock body having a key operated pin tumbler lock which turns a cam that establishes the normal locked and unlocked positions of the padlock shackle, the pin tumbler lock being operative by a second key that turns the cam to an inoperative position releasing the shackle and the pin tumbler lock from the padlock body.
Description (OCR text may contain errors)
1451 Jan. 15, 1974 United States Patent 1191 Van Lahr, deceased [5 PADLOCKS 2 457,650 l2/l948 2,481,093 9 1949 D  Inventor Leo Van Lal ir, deceased, late of 3,735,612 511973 gggs Cincinnati, Oh1o by Helen F. Van
Lahr, administratrix Primary ExaminerRobert L. Wolfe Attorney-Walter S. Murray Progress Tool and Engineering Co., Inc.
 Filed: Dec. 1, 1972 ABSTRACT 21 Appl. No.: 311,390 7] A padlock body having a key operated pin tumbler lock which turns a cam that establishes the normal locked and unlocked positions of the padlock shackle, the pin tumbler lock being operative by a second key 92 7 6 A6 37%3 mm ,B i 9 8% 3 3 8E 0 moon 7 W N mmh c .r a e "S l f C .m te U.mF mum 555 that turns the cam to an inoperative position releasing the shackle and the pin tumbler lock from the padlock body.
1,580,574 70/369 X 4 Claims, 6 Drawing Figures i d MM 4 7/ 2 4 PADLOCKS This invention relates to improvements in padlocks and is intended primarily for commercial padlocks used to protect coin machines set out in public places, such as automatic soft drink vendors, cigarette machines, and the like equipment where frequent lock combinations and key changes are necessary to prevent unauthorized access to machines protected by the padlocks.
An object of the invention is to provide a padlock construction having novel means for normally locking and unlocking the shackle thereof relative to the padlock case with a key rotatable locking unit and to provide a master key for the unit adapted to release the shackle part and the unit part from the case for their replacement with substituted parts.
It is another object of the invention to provide a single key rotatable cam means which serves to normally lock the pin tumbler cylinder in the padlock case, to mount one leg of the padlock shackle to the case for axial and rotatable movements and to lock and unlock the other leg of the shackle to the case; said cam means being adapted for master key rotation into a neutral position whereby the shackle and the cylinder are removable from the case for replacement purposes.
A further object of the invention is to provide a padlock having the foregoing characteristics which has all its parts strongly connected interiorly of the padlock case against unauthorized removal therefrom with tools or other instruments, said parts being readily removed from the case for replacement, when required.
These and other objects will be apparent from the following description and the accompanying drawings which show a preferred embodiment of my invention.
In the drawings:
FIG. 1 is a fragmental, sectional view of the padlock, parts thereof being shown in side elevation and the regular key shown in dotted lines and in position to open the lock.
FIG. 2 is a bottom plan view of the padlock depicted in FIG. 1.
FIGS. 3 and 4 are enlarged sections taken on lines 3--3 and 44, respectively, of FIG. 1.
FIG, 5 is a plan view ofthe regular key for the padlock.
FIG. 6 is a plan view of the master key for the pad lock.
With particular reference to the drawings the numeral 10 designates a padlock body member made of a block of metal and having a centrally located blind end bore 11 formed through the bottom face 12 of the body. This bore receives the cylinder 13 of a key controlled, pin tumbler lock 14 that is similar, in many respects, to the lock disclosed in US. Pat. No. 2,993,361 granted July 25, 1961.
The pin tumbler lock has a key controlled plug 15 journaled in the cylinder 13, said plug having a circular row of angularly spaced apart holes 16 (FIG. 2) formed through its exposed face 17 to receive the key engaging ends of pin tumblers that are arranged in predetermined permutations between the plug 15 and the cylinder 13, as is well understood in the art,to thereby release the plug for controlled rotation within the cylinder by the regular key of the lock. The plug has a cam 18 fixed to the end opposed face 17, said cam having a concentric hub 19 which abuts the plug, a mounting screw 20 being countersunk in the cam 18 and threaded to the plug 13. As best shown in FIGS. 1 and 4 of the drawings the cam has a circular portion 21 concentric with the hub 19 and a tangentally extending flat portion 22 formed across the periphery of the circular portion which subtends an arc of approximately The circular portion 21 of the cam is formed on a radius identical with the radius of the cylinder 13.
As best shown in FIG. 3 the interior of the bore 11 adjacent to but spaced from the blind end thereof has an arcuate shoulder 23 formed integral with the body member and the upper end portion of the cylinder 13 has a flat 24 formed thereon which engages against the terminal ends 25 and 26 of the shoulder 23 to preclude rotation of the cylinder when assembled in the member. With reference to FIG. 1 it is to be noted that the circular portion21 of the cam is positioned in the case against the blind end of the bore 11 and that said circular portion extends radially beyond the shoulder 23 which normally functions to lock the cylinder of the key controlled tumbler lock within the body member 10.
A pair of shackle receiving blind end bores 27 and 28 are formed in the padlock body member 10 through the upper face 29 and are disposed on oppositesidesof the bore 11. As depicted in FIG. 3 the formed peripheries of the bores 27 and 28 overlap the formed periphery of the bore 11 thereby establishing open communication between the bore 11 and each of the bores 27 and 28, as will be more fully understood hereinafter.
The bore 27 receives one leg 30 ofa shackle 31, said leg having a notch 32 formed therein which cooperates with the circular portion 21 of the cam 18 to lock the shackle to the body member. The other leg 32 of the shackle is received in the bore 28 and is provided with an annular groove 33 to receive the periphery of the circular portion 21 of the cam 18 which serves to nor mally provide swivel movement for the shackle when the latter is in the position shown in FIG. 1. A longitudinal flat 34 is formed on the leg 32 in communication with the groove 33 and is adaptedto permit axial movement of the shackle into and from the locked position with the body member, an expansile spring 35 being adapted to bias the shackle into the direction shown in said FIG. 1. 1
Now with reference to FIGS. land 2 of the drawing, the cylinder 13 is provided with an annular key engaging end portion which has a pair of bayonet slots 36 and 37 formed in the circular side wall of the portion and which subtend arcs of substantially 90 and in opposite rotatory directions. This end 135 is adapted to telescope into an annular flange 38 on a regular key 39 (FIGS. 1 and 5) having a number of tumbler depressing pins 139 thereon adapted to place all the tumbler pins within the lock in a predetermined] sheer plane which permits rotation of the plug in the cylinder. A pair of inwardly extending lugs 40 and 41 are mounted on the flange 38 of the regular key 39 and] are adapted to engage in the bayonet slots 36 and 37, respectively, so that the plug may be controlled to turn 90 within the cylinder and thereby operate the cam 18 through 90 and return. A master key 42 is also provided which will operate the plug 13, said key differing from the regular key 39 by the absence of the lugs 40 and 41 from the flange 38 (FIG. 6).
OPERATION In operation and with particular reference to FIG. 4
the padlock parts are in normal open position with the circular portion 21 of the cam 18 interposed between the blind end of the bore 11 and the internal shoulder 23 thereon to lock the cylinder 13 in said bore, said circular cam portion also being engaged in the annular groove 33 in the shackle leg 32. Also to be noted is that in said open position of the padlock parts the regular key 39 is telescoped with the annular end 135 of the cylinder 13 with its pins 40 and 41 in the closed end portions of the bayonet slots 36 and 37, respectively. After the shackle leg 30 is in the bore 27 and with the key 39 in telescoped position determining the sheer conditions of the pin tumblers the plug 15 is freed to be rotated counterclockwise by the key (FIG. 4) whereby the circular portion 21 will be rotated 90 into the notch 32 of the leg 30 while also remaining engaged over the shoulder 23 and the flat 34 on the leg 32 of the shackle. At this point the pins 40 and 41 on the regular key can be axially removed through the entrance openings in the bayonet slots 36 and 37 and the padlock is in locked condition. Manifestly reversing the foregoing steps will return the lock to the condition shown in FIGS. 1 and 4 of the drawings for further normal padlock usage.
To disassemble the packlock parts shackle 31 is left in the opened position shown in FIG. 1 of the drawings and the regular key 39' used to return the cam 18 to the locked position shown by the dotted lines in FIG. 4 whence the regular key may be removed from the lock in the usual way. The master key 42 is then telescoped over the shoulder 135 to move the pin tumblers to sheer positions and the masterkey then rotates the plug and its cam 18 90 counterclockwise to the position indicated by the dot-and-dash lines in FIG. 4, whereby the flat portion 22 of the cam will be brought into vertical registry with the flat portion 24 of the cylinder 13 thus releasing the leg 32 of the shackle and also permitting the cam to clear the shoulder 24 so that the cylinder will be free to axially drop out of the bore 11 and the shackle leg 32 to be removed from its bore 28.
To reassemble the padlock parts with different keys and pin tumbler lock permutations the shackle is held against the spring 35 in the approximate position shown in FIG. 1 of the drawings and the cylinder 13 of the lock and the cam 18 fully inserted into the bore 11. With the master key associated with the plug the plug 15 is released from the cylinder 13 and the cam 18 ro-- tated clockwise into the position indicated by the dotted lines shown in FIG. 4 whereafter the master key is removed from the lock. The regular key 39 may then be used to rotate the cam 18 into the position shown in FIGS. 1 and 4 of the drawings for the normal usage of the padlock.
What is claimed is:
1. In a padlock the combination ofa shackle, a body member having a center bore closed at one end and open at the opposite end, a key controlled pin tumbler lock having a cylinder axially receivable in the bore through the open end thereof, a laterally reduced portion on the inner end of the cylinder, abutment means projected into the bore from the internal wall of the center bore, said abutment means spaced from the closed end of said bore and abutting the reduced portion on the cylinder, a pair of shackle leg receiving bores disposed on opposite sides of the center bore and each in open communication with the closed end portion of said center bore, a key rotatable cam operatively connected to the pin tumbler lock and having a circular portion and a radially reduced portion thereon, said circular portion of the cam normally overlapping the abutment means and being adapted for first key controlled rotation to engage one or both of the shackle legs disposed in the pair of bores, and for a second key controlled rotation to align the radially reduced portion thereof with the reduced portion on the cylinder to disengage the cam from a shackle leg and also permit axial removal of the cylinder,the cam and the shackle from the body member.
2. In the padlock set forth in claim 1 wherein the laterally reduced portion on the inner end of the cylinder is a flat formed on a chord of the cylinder and the abutment means is a circular shoulder having terminal ends in surface contact with the flat formed on the cylinder.
3. In the padlock set forth in claim 2 wherein the cam is concentric with the cylinder and the circular portion on the cam has the same diameter as the cylinder, and the radially reduced portion on the cam is a flat formed on a chord of the cam.
4. In the padlock set forth in claim 3 wherein the pair of shackle leg receiving bores overlap the center bore and the center bore is formed through the central exterior portion of the circular shoulder.
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