US2847846A - Key operable combination lock - Google Patents

Description

Aug. 19, 1958 Filed Oct. 25, 1957 J. L. TAYLOR ETAL KEY OPERABLE COMBINATION LOCK 2 Sheets-Sheet l INVENTORS James L hyar Jrl/wribelsazy ATTORNEYS 1958 -J. L. TAYLOR ETAL KEY OPERABLE COMBINATION LOCK 2 Sheets-Sheet 2 Filed Oct. 25, 1957 INVENTORS Jflms'l. lhy/ar Ari/harflbelsom BY g, z ATTORNEYS United States Patent @fiice KEY OPERABLE coMniNA'rrol tour;

James L. Taylor and Arthur Abelson, Rochester, N. Y assignors to Sargent & Greenleaf, inc, Rochester, N. Y., a corporation of New York Application October 25, 1957, Serial No. 65%,346

7 Claims. (Cl. 70-485) T his invention relates, in general, to locks of the type including a combination mechanism, and more particularly to combination locks having key lock facilities incorporated therein and adapted especially for lockers or cabinets.

Heretofore, it has been the custom to provide locks for securing students lockers or cabinets in large installations such as schools, laboratories, workshops and the like, and in factories, where each student or workman has a locker or cabinet in which his books, clothing, tools and the like are kept. Because of the difficulty in keeping up with the keys associated with key locks, combination locks have come into wide use for such applica- Lions. Where such combination locks are used, the combinations for each of the locks are different, and each student or workman normally knows only the combina' tion giving access to his particular locker. it is frequently necessary that the instructor or some other supervisory personnel have access to all of the locks. To accomplish this, the combinations of the locks must either be recorded at a central location accessible to the instructor or supervisor, or some key lock mechanism must be incorporated in the combination locks and operable by a single master key. Also, as the locks in these cases are usually periodically reassigned to different students or different workmen, the combination of the locks should be readily subject to change upon such reassignment so that the former tenant of the locker who had memorized the combination of the lock would not have further access to the locker. in many cases alteration of the combination of combination locks, particu larly in the case of inexpensive combination locks, requires complete disassembly of the mechanism.

An object of the present invention is the provision of a novel lock mechanism for lockers, cabinets and the like, which is of durable and reliable construction and is readily adaptable to mass production techniques.

Another object of the present invention is the provision of a novel combination lock mechanism for lockers and the like in which the bolt may be operated either by manipulation of the combination for the lock or by means of a master key.

Another object of the present invention is the provision of a novel combination lock mechanism for lockers and the like which is operable either by the assigned combination or a master key, and which is also readily operable by a diiferent key to change the combination of the lock from outside of the locker door and without disassembling of the lock mechanism.

Still another object of the present invention is the provision of a novel combination lock mechanism for lockers and the like wherein at least two different keys may be employed to operate the lock having different control functions, without the use of a master pin arrangement.

Other objects, advantages and capabilities of the present invention will become apparent from the following detailed description, taken in combination with the ee- Ilia! companying drawings illustrating one preferred embodiment of the invention.

in the drawings:

Figure 1 is a front elevation of a key operable combination lock embodying the present invention;

Figure 2 is a vertical section of the combination lock taken longitudinally of the dial spindle axis, as indicated by the l'ne LE -2 in Figure 1;

Figure 3 is a vertical section taken transverse tothe axis of the dial spindle as indicated by the line 3-3 in Figure 2; 3

Figure 4 is a horizontal section taken along the line of Figure 2;

Figure 5 is a rear elevation of the combination lock with the rear cover plate and tumbler wheels removed;

Figure 6 is a top plan view of the pin-tumbler lock p Figure 7 is a vertical transverse section of the pintumbler lock plug, taken along the line 7--7 of Figure 6; and

Figure 8 is a rear elevation of the pin-tumbler lock plug.

Referring to the drawings, wherein like reference characters designate corresponding parts throughout the several figures, the combination lock of the present invention, indicated generally by the reference character 10, includes an escutcheon plate 11 serving additionally as a mounting plate for the lock, having a vertically elongated body portion 12 adapted to be positioned on the front surface of a locker or cabinet door 13. A pair of integral posts or mounting studs 14 project rearwardly from the body portion 12 through correspondingly spaced apertures in the door 13, the posts having rearwardly opening internally threaded bores for receiving mounting bolts 1.5 which extend from rearwardly of the locker door 13 through vertically spaced integral mounting Wings 16 on a lock casing 17 disposed rearwardly of the door 13. The lock 10 is rigidly affixed to the locker door 13 by the coaction of the adjacent surfaces of the mounting wings 16 on the lock casing 17 and the body portion 12 of the escutcheon plate 11 which abut the opposite surfaces of the door 13.

The escutcheon plate 11 includes a centrally located forwardly projecting wall portion 18 which is centrally apertured as indicated at 19 to form a rotary bearing for a unitary dial and spindle assembly 20. The dial and spindle assembly 24? includes a cylindrical dial 21 having the usual dial graduations on the periphery thereof, a forwardly projecting dialknob 22, and, proceeding rearwardly from the cylindrical dial 21, an intermediate bearing portion 23 having an interrupted cylindrical surface, a gear section 24, and a spindle 25 which is of rectangular cross section. The escutcheon plate 11 is also provided with an integral, forwardly projecting, annular shield 26 which is concentric with the axis of the aperture 19 and is of slightly larger diameter than the periphery of the cylindrical dial 21 to substantially surround the periphery of the dial 21 and shield the same against observation. The shield 26 is interrupted over an are of about fifteen to twenty degrees centered on and disposed above, the axis of the shield 26 to pro vide a sight opening 27 through which the dial graduations may be observed.

The lock casing 17 has a front wall 28 which is provided with a centrally located aperture 29, which is aligned with the aperture 19 in the escutcheon plate 11. The rearmost end of the gear section 24 of the dial and spindle assembly 20 projects into, but not through, the aperture 29. The aperture 29 may be suitably lined with an annular bushing, or the like, having an inner diameter corresponding substantially to the outer diameter of the gear section 24 to form a journal 2,8473% Patented Aug. 19, 1958 asasgsae bearing for the dial and spindle assembly 20. Spaced rearwardly of the front wall 28 of the lock casing 17 is a driving cam 30 having a central boss 31. An aperture 32 of rectangular cross section conforming to the cross section of the rectangular spindle 25 extends through the 'driving cam 30, and its boss 31, the spindle 25 being normally projected through the driving cam aperture 32. By this rectangular driving cam aperture 32 and the rectangular spindle 25, the driving cam 36 and dial and spindle assembly 26 are coupled together for corresponding rotary movement, but the spindle is freely slidable into and out of the driving cam aperture 32. The driving cam 34} is provided with the usual peripheral notch or gate 33 at a selected location along the periphery of the driving cam.

A slidable bolt 34 comprising an integral bolt tongue 35 projectingthrough an aperture 36 in the casing l? to cooperate with a conventional keeper, and a bolt plate 37 lying within the casing 17 bears against the inner surface of the front wall 28 of the lock casing be- 7 tween the front wall 28 and the driving cam 36. The bolt plate 37 has a laterally elongated relieved area in the region of the spindle 25 to permit lateral sliding movement of the bolt 34 relative to the spindle A plurality of rack teeth 39 extending along the lower bounding surfaces of the relieved area 323 rearwardly spaced from the teeth of the gear portion 24 of the dial and spindle assembly 20 are aligned with the gear section 24 to be coupled therewith when the dial and spindle assembly is projected inwardly from the position illustrated in Figure 2. A portion of the bolt plate 37 lying below the teeth 39 forms a spacer for properly spacing the driving cam 30 relative to the front wall of the casing 17. The lower edge portion of the bolt plate 37 is formed with a spring box or housing dd in which a coil spring 41 is seated. The righthand end of the coil spring 41, as viewed in Figure 5, bears against a wall 42 of the spring box and the lefthand end of the spring 41 bears against a shoulder 43 which is integral with the front wall 28 of the casing 17 and projectsinto the spring box 40, the spring 41 thereby serving to biasthe bolt 34 to a locked position wherein the bolt tongue 35 is projected into the associated keeper. The bolt plate 37 also has a vertical projection on which a fence lever 45 is pivotally carried. fence lever 45 has a fence lever nose 46 positioned to normally ride on the periphery of the driving earn 39 and a laterally projecting fence 47 which normally over-- ,lies the peripheries of the wheel tumblers, to be later described. The fence lever 45 is normally biased in a counter clockwise direction, as viewed in Figure 5, by means of a spring 48 to urge the fence lever nose toward the driving cam 30. The rear cover plate 4% of the lock casing, 17 which is removable, has centrally located, inwardly projecting tumbler post 56 which supports a plurality of spaced, coaxially arranged wheel tumblers 51, 52 and 53 of the conventional hole change type having a peripheral gating or notch therein for receiving the fence 47 when the tumbler gates are aligned therewith. The wheel tumblers 51, 52 and 53, in the form herein illustrated, are spaced from each other by means of annular spacing washers 5d and drive pin spacers 55 of conventional construction having an annular ring surrounding the tumbler post 50 and a thin v The engage the radially projecting finger on the drive pin spacer associated with the forwardmost wheel tumbler 51 to adjust that wheel tumbler in relation to the rotation of the driving cam 36. It will be understood by those skilled in the art that the end of the radial finger on the drive pin spacer 55 associated with wheel tumbler 51 projects into the path of the radial finger of a like drive pin spacer 55 associated with the next tumbler 52 to engage and drive that tumbler, and that tumblers and 53 are intercoupled by a lost motion coupling in like manner. it will be observed from Figure 2 that the forwardmost end of the tumbler post 50 projects substantially into abutment with the driving cam 30 and surrounds the boss 31 so that the driving cam 30 is confined to the position within the casing illustrated in radially projecting finger which is bent at its end to 6 extend perpendicularly to the plane of the spacer and project into one of a series of circularly arranged perforations 56 of its associated wheel tumbler in accordance with theselected combination. A split retaining washer 57 which is inserted into an annular groove adjacent the inner end of the tumbler post 50 releasably retains the wheel tumblers 51, 52 and 53 on the tumbler post.

The driving cam 30 has the usual drive pin 56 projecting toward the tumblers from the driving cam 36), the rearmost end of the drive pin 58 being positioned to Figure 2 by the tumbler post 50 and the bolt plate 37.

The dial knob 22 is bored as indicated at 58 to accommodate pin-tumbler key lock cylinder generally indicated at 59 of more or less conventional construction having in the preferred embodiment five pin tumblers so and a cylindrical plug 61 supported in the dial knob 21, for rotation about its longitudinal axis. The plug 61 is provided with the usual key-way 62 into which the pin tumblers project and on its innermost end, has a pair of cams 63 and 64 between which an annular groove 65 is provided, into which the lower Wall portion 18' bounding the aperture 19 in the escutcheon plate 11 projects. The earns 63 and 64 are of like configuration having a cylindrical segment 66 which conforms to the cylindrical surface of the plug over an arc of slightly more than 180 and a cut-away portion 67 extending along an arcuate path which at one point joins the surface of the groove 65 and conforms to the portion 18' of the bounding surface of the aperture which projects into the groove 65. The cams 63 and 64 are, however, 180 out of alignment with each other.

An elongated slot 68 extends in one direction about the periphery of the plug 61 for slightly over from one of the pin holes for the pin tumblers 62, for example, the number 2 pin hole, counting from the front of the plug, and a similar elongated slot 69 extends in the opposite direction from another of the pin holes, for example, the number 3 pin hole. A third one of the pin holes, for example, the number 5 pin hole, may have similar elongated slots extending in both directions providing a slot 70 of slightly greater than The plug 671 is normally in the position illustrated in Figure 8, in which the projecting segment portions 66 of both cams 63 and 64 lap the portions of the escutcheon plate Wall portion 18' bounding the lower part of the aperture 19 and axially restrain the dial and spindle assembly 2b in the position illustrated in Figure 2. This is the normal operating condition of the lock. When the combination, is dialed to position the gntings of the wheel tumblers and the driving cam gate 33 in registry with the fence 47 and fence lever nose 46, the fence lever spring 45 will urge the fence lever nose 46 into the driving cam gate 33 and the fence 47 into the wheel tumbler gatings, whereupon further limited rotation of the dial knob 22 in a selected direction effects withdrawal of the bolt through the intercoupling of the fence lever nose 47 in the driving cam gate 33. It will be noted that in this phase of operation of the lock, the innermost edge of the dial 21 is spaced outwardly from the adjacent front wall portions of the escutcheon plate if.

in order to effect operation of this lock by an instructor or supervisor not having knowledge of the combination, a master key is provided which is cut so that the portions of the key bit aligned with the second and third pin holes are cut low and high in accordance with the selected key respectively, to position the pin tumblers 60 so that the pin tumbler separation for the second pin hole falls between the base of the slot 68 and the periphery of the plug 61 and the pin tumbler separation for the third pin hole is aligned with the plug periphery. This perk ll mits the plug 61 to turn only to the right, or in a clockwise direction, as viewed in Figure 1 through the are approximately 90 permitted by the slot 68. This rotation of the plug 61 and corresponding rotation of the cams 63 and 64 positions the forwardmost cam 64 so that the arcuate surface 67 in the relieved portion of the cam 64 registers with the periphery of the opening 19 and permits the dial and cam assembly 20 to be projected inwardly, or to the left as viewed in Figure 2, to a sufiicient degree to intercouple the gear teeth on the gear portion 24 with the rack teeth 39 on the bolt 34. Then rotation of the dial and spindle assembly 2t through a limited arc will effect shifting of the bolt 34 to withdraw the bolt tongue 35 from the keeper. Upon rotation of the dial knob 22 in the opposite direction to return the bolt to projected position, the dial and spindle assembly may be withdrawn forwardly to its initial position and the key and plug 61 rotated counter clockwise to the initial position wherein the dial and spindle assembly 20 is held against axial displacement by the earns 63 and 64 engaging opposite sides of the escutcheon plate wall portion 18 bounding the opening 19.

When it is desired to change the combination of the lock, this may be done by a control or combination change key having a bitwhich is cut so that the portion aligned with the number 2 pin hole is highto position the pin tumbler separation to be registered with the plug periphery and the portion aligned with the number 3 pin hole is low to position the pin tumbler separation between the bottom of the slot 69 and the periphery of the plug 61. The control key is therefore elfective to turn the plug 61 to the left or in a counterclockwise direction as viewed in Figure l for an are or about 90 as determined by the length of the slot 69. The length of the slot 6? permits suflicient counterclockwise rotation of the plug to bring the arcuate cut-away surface 67 of the innermost cam 63 into alignment with the portion of the escutcheon plate wall 18' projected into the groove 65. This counterclockwise rotation of the plug 61 then frees the dial and spindle assembly 20 to be shifted forwardly, or to the right as viewed in Figure 2, and be wholly withdrawn from the lock assembly. In this way, the spindle 25 may be withdrawn through the aperture 29 in the front wall 28 of the lock casing 17 and thereby decoupled from the driving cam 30. Due to the rectangular cross section of the driving cam aperture 32 and spindle 25, the combination may be readily changed by merely rotating the dial and spindle assembly 20 through 90, 180 or 270 from the angular position it occupied relative to the driving cam 3d and the assembly 20 returned to its normal position by projecting the spindle 25 back through the aperture 29 and driving cam aperture 32. Upon return of the assembly 20 to the position illustrated in Figure 2, the control key and plug 61 may then be rotated to the right, or in a clockwise direction to its initial position, returning the cam63 to a position wherein the projecting cam portion 66 laps the escutcheon plate wall portion 18' bounding the aperture 19. In like manner, the master-combination change key may be provided wherein the bit is cut to align pin tumbler separations for the second and third pin tumblers with the periphery of the plug 61 and position the pin tumbler separation for the number pin hole between the base of the slot 70 and the plug periphery. In this condition, the plug may berotated either clockwise or counterclockwise to shift the assembly 20 inwardly for retracting the bolt or withdraw the assembly 20 outwardly to change the combination. Thus, by the construction above described, the combination lock may be controlled by three different keys without the use of any normal master key setup.

While a preferred and practical embodiment of the invention has been disclosed in the above description, it will be understood by those skilled in the art that the disclosure represents an exemplary embodiment and that 6 other arrangements of parts, cooperable to carry out the inventive concept, are to be regarded as within the purview of the invention.

We claim: 1. A key operable combination lock comprising a lock casing, a plurality of rotatable tumblers, a driving cam therefor, a reciprocative bolt member, a fence lever on said bolt member operatively associated with said tumblers and said driving cam for shifting said bolt upon rotation of said driving cam when said tumblers occupy a preselected position, an axially movable rotatable spindle having a manually operable dial fixed thereon and first and second driving portions spaced along the axis of the spindle, said bolt member having means thereon disposed adjacent said spindle in a position to be intercoupled with said first driving portion on said spindle at a first position of axial adjustment of the spindle interconnecting the bolt member with the spindle to be driven upon rotation of the latter, and said driving cam having means positioned to be connected to said second driving portion for rotation with said spindle at a plurality of different angular positions relative to said spindle when said spindle is disposed in a second position of axial adjustment and be decoupled from said second driving portion freeing the spindle for adjustment to a different angular relation with said driving cam when said spindle is displaced axially a selected distance from said second position, means on said spindle for normally restraining said spindle against displacement from said second position of axial adjustment, and key lock means responsive to one key to release said spindle for axial displacement to said first position and responsive to a difierent key to release said spindle for axial displacement said selected distance from said second position.

2. A key operable combination lock comprising a lock casing, a plurality of rotatable tumblers, a driving cam therefor having a central aperture therein, a reciprocative bolt member, a fence lever on said bolt member operably associated with said tumblers and said driving cam for shifting said bolt upon rotation of said driving cam when said tumblers occupy a preselected position, an axially movable rotatable spindle having a manually operable dial fixed to one end thereof, a terminal portion at the opposite end thereof, and an intermediate driving member, said bolt member having means thereon disposed adjacent said spindle in a position to be intercoupled with said driving member on said spindle at a first position of axial adjustment of said spindle whereby said bolt memher is directly driven to retracted and projected positions by rotation of said spindle, and said terminal portion of said spindle having means intercoupling said driving cam and spindle against relative rotation when said spindle is disposed in a second position of axial adjustment and decoupling said driving cam and spindle for relative rotation at a third position at axial adjustment of said spindle, means on said spindle for normally holding said spindle at said second position of axial adjustment, and key lock means operative by one key to release said spindle for axial adjustment to said first position and operative by a different key to release said spindle for axial adjustment to said third position.

3. A key operable lock comprising a lock casing, a plurality of rotatable tumblers, a driving cam for adjusting said tumblers having a central aperture of polygonal cross section, a slidable bolt supported in said casing, a fence lever on said bolt member operatively associated with said tumblers and driving cam for shifting said bolt upon rotation of said driving cam when said tumblers occupy a preselected position, a spindle having an inner end portion corresponding in cross section to said polygonal aperture and normally slidably fitted therein at any of a plurality of different angular positions and a manually operable dial fixed to the outer end thereof, a gear section on said spindle intermediate the ends thereof, a

stationary wall underlying said dial having an aperture accommodating said spindle, means supporting said spindle for rotation about its axis and for axial withdrawal from said driving cam aperture, said bolt member having rack teeth normally decoupled from said gear section and positioned to be coupled with the same upon axial displacement of said spindle from the normal position thereof, a key lock cylinder rotatably supported on said spindle and having a plurality of cams thereon lapping portions of said. stationary wall adjacent the aperture therein for restraining said spindle against axial displacement from the normal position thereof, said key lock cylinder including means rendering said cam means adjustable in response to one key to release said spindle for axial adjustment from said normal position to a positiontintercoupling said gear section with said rack teeth to condition said bolt to bedriven directly by rotation of said spindle and means for adjusting said cams in response to another key for releasing said spindle for axial withdrawal from said driving cam aperture and reinsertion into said driving cam aperture at a different angular position.

4. A key operable combination lock comprising a lock casing, a plurality of rotatable tumblers, a driving cam for adjusting said tumblers, a bolt member slidably supported in said casing, a fence lever on said bolt member operatively associated with said tumblers and said driving cam for shifting said bolt upon rotation of said driving cam when said tumblers occupy a preselected position, a spindle having an inner end portion of polygonal cross section and a manually operable dial fixed to the outer end of said spindle, a gear section on said spindle intermediate the ends thereof, a stationary escutcheon plate including a wall underlying said dial having an aperture for receiving said spindle therethrough, a driving cam having a central aperture complementing said inner end portion of said spindle in axial alignment therewith and adapted to receive the same at any of a plurality of different angular positions, means supporting said spindle for axial displacement from a normal position wherein said inner end portion is fitted in said driving cam aperture to a position wherein said spindle is withdrawn therefrom, said bolt having rack teeth spaced along the axis of said spindle from said gear section when said spindle occupies said normal position and disposed to be in driven engagement with said gear section upon axial displacement of said spindle inwardly of said normal position to intercouple said spindle and said bolt for direct movement of the bolt, key lock means including a key cylinder journaled for rotation in said spindle, cam means on said cylinder coacting with said escutcheon plate wall for normally holdingrsaid spindle against axial displacement from said normal position, means for adjusting said cam means in response to a first key to release said spindle for axial inward movement from said normal position to intercouple said gear section and rack teeth, and means for adjusting said cam means in response to a second key to release said spindle for axial withdrawal of said inner end portion from said driving cam aperture.

5. A key operable combination lock comprising a lock casing, a plurality of rotatable tumblers, a driving cam for adjusting said tumblers, a bolt member slidably sup ported in said casing, a fence lever on said bolt member operatively associated with said tumblers and said driving cam for shifting said bolt upon rotation of said driving cam when said tumblers occupy a preselected position, a spindle having an inner end portion of polygonal cross section and a manually operable dial fixed to the outer end of said spindle, a gear section on said spindle intermediate the ends thereof, a stationary escutcheon plate including a wall underlying said dial having an aperture for receiving said spindle therethrough, a driving cam having a central aperture complementing said inner end portion of said spindle in axial alignment therewith and adapted to receive the same at any of a plurality of different angular positions, means supporting said spindle for axial displacement from a normal position wherein said inner end portion is fitted in said driving cam aperture to a position wherein said spindle is Withdrawn therefrom, said bolt having rack teeth spaced along thev axis of said spindle from said gear section when said spindle occupies saidlnormal position and disposed to be in driven engagement with'said gear section upon axial displacement of said spindle inwardly of said normal position to intercouple said spindle and said bolt for direct movement of the bolt, key lock means including a key lock cylinder jo'urnaled for rotation in said spindle, a pair of cams on said cylinder extendingin opposite phase to each other and having portions which simultaneously lap the opposite surfaces of said escutcheon plate wall for restraining said spindle against axial displacement from said normal position, said cylinder including means releasing the same for rotation in a first direction in response to a first key for removing-one of said cams from lapping relation with said wall and releasing said spindle for inward axial displacement from said normal position to a position in tercoupling said gear section and rack teeth and means releasing said cylinder for rotation in an opposite direction in response to a second key for removing the other of said cams from lapped relation with said wall to free said spindle for axial withdrawal of said inner end portion from said driving cam aperture.

6. A key operable combination lock comprising a casing, a plurality of peripherally gated wheel tumblers, a driving cam for adjusting said tumblers, a reciprocative bolt having a bolt plate slidably supported within said casing, a fence lever pivotally supported on said bolt plate for intereoupling said bolt with said drive cam and tumblers for reciprocating said bolt in response to rotation of said driving cam when said driving cam and'tumblers are in a preselected position, a spindle projecting into said casing having a dial member on the end thereof disposed outwardly of said casing for manual manipulation, said casing including means supporting said spindle for rotation about its axis and for axial displacement, said spindle having a polygonal interlocking formation at the inner end thereof and a gear section intermediate its ends, said driving cam having a central opening therein corresponding to the cross section of said interlocking formation and disposed in axial alignment with said spindle for slidably receiving said interlocking formation therein at a plurality of angular positions and interlocking said driving cam with said Spindle for rotation therewith when said spindle occupies a first position of axial adjustment, said bolt plate having rack teeth disposed adjacent said spindle in alignment with said gear section to be intercoupled therewith when said spindle occupies a second position of axial adjustment for driving said bolt to retracted and projected positions directly by rotation of said spindle, key lock means including a key lock cylinder journaled for rotation in said spindle, a stationary member underlying said dial, cam means on said cylinder coacting with said stationary member for normally holding said spindle against axial displacement from said first position of axial adjustment, means for adjusting said cam means in response to a first key to release said spindle for axial movement between said first and second positions of axial adjustment, and means for adjusting said cam means in response to a second key to release said spindle for axial displacement to a position with drawing said interlocking formation from said driving cam aperture to free said spindle to be interlocked with said driving cam at a difierent angular relation to said driving cam.

7. The combination recited in claim 6, wherein said key lock means includes a plurality of pin tumblers coacting with said cylinder to normally restrain the same against rotation, said cam means comprises a pair of cams on said cylinder extending in opposite phase and having portions for simultaneously lapping opposite surfaces of said stationary member, and said key lock cyl- 2,847,846 v 9 1O inder includes a peripheral slot extending in one direcrelease the spindle for axial withdrawal of the interlocktion coacting with one of said pin tumblers to permit iug formation from said driving cam aperture. limited rotation of the cylinder in a direction to remove one of said cams from lapped relation with said station- References Cited in the file of this patent ary member to release the spindle for axial movement be- 5 tween said first and second positions and another slot co- UNITED STATES PATENTS acting with a difierent one of said pin tumblers to permit 625,249 Durnbaugh May 16, 1899 rotation of the cylinder to remove the other of said cams 1,650,564 Wolfi Nov. 22, 1927 from lapping relation with said stationary member and

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