Abstract:
A lock apparatus able to be installed in a structure comprising an outer sleeve having a plurality of outer rows extending transversely therethrough and radially therearound and a first bore extending though substantially a center thereof. An inner sleeve having a second bore extending through substantially a center thereof and is releasably connected within the first bore. The inner sleeve includes a plurality of inner rows extending therethrough wherein each respective inner row is aligned with a respective one of the plurality of outer rows. A plurality of user selectable pin sets is positioned within the plurality of outer and inner rows. A lock core for receiving a key therein is releasably connected within the second bore and includes a core pin set wherein a respective one of the plurality of user selectable pin sets is aligned with the core pin set creating an active pin formulation. A means for changing said active pin formulation is connected within each of the core and the inner and outer sleeves for changing the active pin formulation.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates generally to locks and, more specifically, to a rekeyable lock having a plurality of pin tumbler combinations that are user selective. Pin tumbler combinations are positioned around the keyway plug and allow any of the preset combinations to be selected. Accordingly, a key mating to each pin tumbler combination is required. To select a different pin tumbler combination, a master key is inserted into the keyway to enable rotation of an outer sleeve about the keyway plug thereby positioning a new set of pins into the keyway. The present invention allows the holder of the master key to change the lock without actually replacing the lock. 
   2. Description of the Prior Art 
   There are other rekeyable locks. Typical of these is U.S. Pat. No. 66,697 issued to Roche on Jan. 29, 1901. 
   Another patent was issued to Ching on Dec. 16, 1941 as U.S. Pat. No. 2,266,163. Yet another U.S. Pat. No. 2,603,081 was issued to Pelle on Jul. 15, 1952 and still yet another was issued on Jul. 19, 1966 to Kerr as U.S. Pat. No. 3,261,188. 
   Another patent was issued to Laake on Feb. 8, 1983 as U.S. Pat. No. 4,372,139. Yet another U.S. Pat. No. 4,850,210 was issued to Adler et al on Jul. 25, 1989. Another was issued to Wobig on Apr. 3, 1990 as U.S. Pat. No. 4,912,953 and still yet another was issued on Jul. 5, 1994 to Adler et al as U.S. Pat. No. 5,325,690. 
   Another patent was issued to Herdman on Oct. 13, 1998 as U.S. Pat. No. 5,819,569. Yet another U.S. Pat. No. 5,921,121 was issued to Tang on Jul. 13, 1999. Another was issued to Loreti on Sep. 19, 2000 as U.S. Pat. No. 6,119,495 and still yet another was issued on Aug. 17, 2004 to Herdman as U.S. Pat. No. 6,776,017. Another was issued to Horsey on Sep. 12, 1905 as U.K. Patent No. GB27,080 and still yet another was issued on Jun. 27, 2002 to Loreti as Bulgarian Patent No. BG63512. 
   U.S. Pat. No. 666,697 
   Inventor: James Roche 
   Issued: Jan. 29, 1901 
   A two-part lever-tumbler for a multiplekey lock, where the tumbler consists of a pivoted main part and a pivoted supplemental part, and said parts being adapted to be rigidly locked together in different relations to each other. 
   U.S. Patent Number 2,266,163 
   Inventor: John F. Ching 
   Issued: Dec. 16, 1941 
   A lock comprising a tubular sleeve provided with an internal screw thread, axially alined separate lock barrels and a plug positioned in and rotatable relative to said sleeve, a first of said lock barrels having a peripheral screw thread meshing with said internal screw thread of the sleeve, a pair of spaced guide rods secured at their ends in said plug and a second of said lock barrels, said first of the lock barrels being in slidable engagement with said guide rods, setscrews in said sleeve and engaging said second of the lock barrels for securing the latter and the sleeve against relative rotation, a rotor comprising separate cylindrical sections journaled respectively in said first and second lock barrels and in said plug, a pair of spaced second guide rods secured at their ends in the rotor sections of said plug and second lock barrel and being in slidable engagement with said first of the lock barrels, tumblers normally locking said rotor and lock barrels together against relative rotation, said rotor sections having alined key way openings, and said tumblers normally projecting into said openings. 
   U.S. Pat. No. 2,603,081 
   Inventor: Stephen Pelle 
   Issued: Jul. 15, 1952 
   A lock device comprising a hollow cylinder and a plurality of slide assemblies disposed within the hollow cylinder. One of said assemblies being adjustable longitudinal of the cylinder, said cylinder having a slot, and each of said slide assemblies having a slide adapted to be projected into the slot and retracted therefrom. The slide assemblies are adapted to receive a key. A means is carried by the cylinder and connected to the adjustable slide assembly for effecting the adjustment of the slide assembly relative to the other assemblies to render the lock adaptable for a different key. An end plate is connected to the hollow cylinder, and said end plate includes a means rotatable and connectable with the slide assemblies to be adjusted by the same. The means for adjusting the adjustable slide assembly comprises a plurality of adjustable members circumferentially spaced from one another. The hollow cylinder has longitudinally extending openings, and the adjustable members are slidable in said openings and engageable with the adjustable slide assembly. A plurality of screws is connected respectively with the adjustable members to move the same. A large gear is located on the end plate and journaled thereabout. Pinion gears mesh with the large gear and are respectively connected to the screws to simultaneously operate the same and to effect the adjustment of the adjustable slide assembly. 
   U.S. Pat. No. 3,261,188 
   Inventor: William J. Kerr 
   Issued: Jul. 19, 1966 
   In an axial pin tumbler lock assembly, in combination, an open-ended, non-rotatable tubular barrel having an axial bore and annular front and rear end faces, a lock shaft rotatable within said bore and having an enlarged head presenting a rear end face in rotative sliding contact with said front end face of the barrel, an axial split pin tumbler arrangement including cooperating barrel and shaft pins, said shaft pins projecting forwardly of the head for cooperation with a key and being freely removable endwise from the shaft head for purposes of pin interchange, a forwardly and axially removable annular cap positioned forwardly of the barrel and encircling said shaft head, fixed interengaging means on the cap and barrel preventing rotation of the cap, said shaft being rotatable from a first angular unlocked position, through a second angular locked position, to a third overrun terminal position, slidable interengaging means on the cap and shaft head normally preventing removal of the cap, said slidable interengaging means permitting forward removal of the cap when the lock shaft is in its terminal position, a collar-like latch member mounted on and rotatable with the lock shaft rearwardly of the barrel and including an axially shiftable latch pin yieldingly and slidingly bearing against the rear end face of said barrel, first, second and third spaced shoulders on said rear end face of the barrel engageable by the latch pin to determine said first, second and terminal positions of the lock shaft respectively, there being access openings in said cap and barrel in axial alignment with said latch pin when the latter is in position against said second shoulder to permit depression of the latch pin by a suitable pin-like tool and consequent withdrawal of the latch pin from said second shoulder to allow the lock shaft to be moved to its terminal position. 
   U.S. Pat. No. 4,372,139 
   Inventor: Dennis L. Laake 
   Issued: Feb. 8, 1983 
   A lock in which a replaceable control shaft adjusts a moveable shaft in the main cylinder to different predetermined levels. By adjusting the moveable shaft a new shear line is created between the key pin housed in the shaft and the spring loaded pin tumbler housed in a separate moveable shaft embodied in the lock housing. When a new shear line has been created a new predetermined key will become operable while the prior key, unless it is a master key, becomes inoperable. A special key when rotated causes a cylinder to rotate creating a cavity in the lock allowing access to the control shaft through the facing of the lock. The control shaft has a spring that compresses upon adjustment securing a nodule on the control shaft into one of several cavity slots. The control shaft has teeth that mesh into the adjustable moveable shaft. The teeth may or may not cause the moveable shaft to change position upon the rotation of the control shaft. The bridging device connects the main cylinder and the sloped upper portion of the adjustable moveable shaft. This bridge slides under and raises the upper moveable shaft into an aligning position with the adjustable moveable shaft thereby preventing jamming when the main cylinder is returned to its original position. 
   U.S. Pat. No. 4,850,210 
   Inventor: Richard S. Adler 
   Issued: Jul. 25, 1989 
   A lock which is rekeyable or programmable to operate with a different key from the exterior thereof without disassembling it or removing it from a lock assembly in which it is assembled is disclosed. The lock is rekeyed by a change key through the keyway so that the lock appears from the exterior thereof to be a conventional lock. The change key which can not operate the lock adjusts a movable shear line formed by what is in effect an externally adjustable tumbler. The lock includes a plurality of pin tumbler sets and a plurality of cylinders disposed one in the other in the lock casing. The pin tumbler sets and the cylinders cooperate to form a plurality of common pin tumbler shear lines, i.e., shear lines formed by a number of individual shear lines of individual pin tumbler sets. In a given position of the adjustable shear line, only one of the keys will position the pin tumblers to form the proper common pin tumbler shear which is aligned with the adjustable shear line to operate the lock. The rekeying structure of the lock is passive and its presence is not noticed when operating the lock. The lock also includes structure which indicates that the adjustable shear line is in one of the positions with which a common tumbler shear line may be aligned. The lock further includes a structure which locks the adjustable shear line in a given position. 
   U.S. Pat. No. 4,912,953 
   Inventor: Gerald C. Wobig 
   Issued: Apr. 3, 1990 
   A cylinder lock is adapted to be re-keyed by a change key which, incident to turning a plug in a cylinder, transversely shifts a shuttle of the cylinder. The shuttle carries three sets of drive and master pins which may be selectively brought into active position relative to the plug by shifting the shuttle transversely. 
   U.S. Pat. No. 5,325,690 
   Inventor: Richard S. Adler et al. 
   Issued: Jul. 5, 1994 
   A lock which is rekeyable or programmable to operate with a different key from the exterior thereof without disassembling it or removing it from a lock assembly in which it is assembled is disclosed. The lock may be rekeyed through the keyway so that the lock appears from the exterior thereof to be a conventional lock, or from the end opposite the keyway from the interior of a door, or from a side of the lock which requires disassembly of the lock from its lock assembly. The lock includes structure defining a movable shear line that can be adjusted from the exterior of the lock without disassembling the lock itself. Such structure may comprise a rotatable cam and a pin tumbler and an axially adjustable set screw. Security of the lock is improved by selectively restricting or blocking access to the rekeying of the lock in the interior thereof with a gate or shutter, or various combinations of gates or shutters. 
   U.S. Pat. No. 5,819,569 
   Inventor: Rodrick A. Herdman 
   Issued: Oct. 13, 1998 
   A lock with changeable warding positions wherein a rotationally indexable warding member selectively enables one of a multiple of keys for operation of the lock. 
   U.S. Pat. No. 5,921,121 
   Inventor: Xu Fai Tang 
   Issued: Jul. 13, 1999 
   The present apparatus provides an adjustable key-type spring pin lock cylinder. The spring pin lock cylinder includes a lock core (1), a first core sleeve (2), and a second core sleeve (3). At the rear section of the lock core, two depressions, each with a countersink on one side, are made. Two steel balls (4) are respectively placed into the depressions. On the rear cover (5) of the lock, there are two through-holes in which the press rods (6) and the springs (7) are placed. By turning the adjusting lever (10) on the supporting stand (9), either key may be selected to open the lock or only one of the two keys can open the lock. 
   U.S. Pat. No. 6,119,495 
   Inventor: Alberto Lorenti 
   Issued: Sep. 19, 2000 
   A programmable cylinder lock that is operable with a first key and a first master key having a different shape than the first key, and that is programmable so that the lock is no longer operable with the first key or the first master key. The reprogrammed lock is operable with a second key having a shape different from the first key and with a second master key having a shape different from the first master key. 
   U.S. Pat. No. 6,776,017 
   Inventor: Rodrick A. Herdman 
   Issued: Aug. 17, 2004 
   An adaptable lock 10 assembly and a method of using the lock 10 assembly in order to reprogram a lock 10 to accept a key different from the key which originally operated the lock 10. The lock 10 assembly includes a housing 12 with a bore 14 disposed through the housing 12 and a plug 16 rotatably mounted in the bore 14. The plug 16 includes at least one radial slot 18 which is disposed in the plug 16 along the circumference of the plug 16. The plug 16 further includes a longitudinal slot used as a keyway 22 which is adapted to receive a key. The assembly further includes first and second radial tumblers 30, 32 which are disposed in the radial slot 18 and are capable of being in an engaged or disengaged relationship. The distal ends of the first and second radial tumblers 30, 32 extend into the keyway 22 to provide a pattern of ridges along the longitudinal inner walls of the keyway 22. When the first and second radial tumblers 30, 32 are engaged in a first position, a first key 24 fits the lock 10. The first and second radial tumblers 30, 32 may be disengaged in order to reprogram the lock 10 to a second key 44. 
   U.K. Patent Number 27,080 
   Inventor: John George Horsey 
   Issued: Sep. 12, 1905 
   Constructing locks with bolts carrying one or more segments capable of being affixed to the bolt and each having a projecting lug, one or more slotted sliding plates coincident with the segments, spring controlled tumblers operating the sliding plates on movement by the key, the segments being adjustable as to position for their lugs to coincide with the slots in the sliding plates when such sliding plates are positioned by the tumblers when actuated by a key, for the purpose of rendering the lock suitable for various sizes of keys, substantially as set forth. 
   Bulgarian Patent Number BG63512 
   Inventor: Alberto Loreti 
   Issued: Jun. 27, 2002 
   A programmable cylindrical lock has a stator having a hole, rotor installed in the stator hole, which has a hole for the key, programming mechanism, which in the process of operation of replacement makes it possible to reprogram the lock for operation with a key different from the one used previously, and at least one closing pin or-counter-pin that is divided into a minimum of two parts and can be displaced to the open position by a minimum of two keys of a different shape. The programming mechanism has in the stator at least a single longitudinal duct made in the hole, optionally including a group of stator seats and closing counter-pins and springs, and in the rotor it has a group of the first seats, which intersect the hole for the key, and a group of the second seats parallel to the first seats. The effect of the programmable lock is an enhanced convenience in use. 
   While these locks may be suitable for the purposes for which they were designed, they would not be as suitable for the purposes of the present invention, as hereinafter described. 
   SUMMARY OF THE PRESENT INVENTION 
   The present invention relates generally to locks and, more specifically, to a rekeyable lock having a plurality of pin tumbler combinations that are user selective. Pin tumbler combinations are positioned around the keyway plug and allow any of the preset combinations to be selected. Accordingly, a key mating to each pin tumbler combination is required. To select a different pin tumbler combination, a master key is inserted into the keyway to enable rotation of an outer sleeve about the keyway plug thereby positioning a new set of pins into the keyway. The present invention allows the holder of the master key to change the lock without actually replacing the lock. 
   A primary object of the present invention is to provide a rekeyable lock that overcomes the shortcomings of the prior art. 
   Another, secondary object of the present invention is to provide a rekeyable lock having a plurality of selectable pin tumbler combinations. 
   Another object of the present invention is to provide a rekeyable lock wherein the plurality of pin tumbler combinations has a mating key. 
   Yet another object of the present invention is to provide a rekeyable lock wherein the mating keys are uniquely distinct from one another. 
   Still yet another object of the present invention is to provide a rekeyable lock wherein the lock includes a lock plug having concentrically located inner and outer sleeves. 
   A further object of the present invention is to provide a rekeyable lock wherein the lock plug can be selectively rotated to a different pin tumbler selection. 
   Another object of the present invention is to provide a rekeyable lock wherein an inner and an outer sleeve include the pin tumblers. 
   Yet another object of the present invention is to provide a rekeyable lock wherein a pin tumbler is a particular configuration of a plurality pins. 
   Another object of the present invention is to provide a rekeyable lock wherein the inner sleeve has a plurality of bores extending therethrough in transversal rows. 
   Yet another object of the present invention is to provide a rekeyable lock wherein the outer sleeve has a plurality of bores extending therethrough aligned in transversal rows with the bores of the inner sleeve. 
   Still yet another object of the present invention is to provide a rekeyable lock wherein the lock extends the life of the lockset. 
   Another object of the present invention is to provide a rekeyable lock wherein the lock permits selection of a new pin tumbler configuration and valid key. 
   A further object of the present invention is to provide a rekeyable lock that is simple and easy to use. 
   A still further of the present invention is to provide a rekeyable lock that is economical in cost to manufacture. 
   Additional objects of the present invention will appear as the description proceeds. 
   The present invention overcomes the shortcomings of the prior art by providing a rekeyable lock having a plurality of pin tumbler combinations that are user selective. The lock of the present invention includes a plurality of pin tumbler combinations that are radially positioned around the keyway plug. The lock allows a user to select and move a desired one of the pin tumblers into the keyway. Accordingly, a key mating to each selectable pin tumbler combination is provided to lock and unlock each pin tumbler combination. To select a different pin tumbler combination, a master key is inserted into the keyway to enable rotation of the outer sleeve about the keyway plug positioning a new set of pins into the keyway. 
   The foregoing and other objects and advantages will appear from the description to follow. In the description reference is made to the accompanying drawings, which forms a part hereof, and in which is shown by way of illustration, specific embodiments in which the invention may be practiced. These embodiments will be described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that structural changes may be made without departing from the scope of the invention. In the accompanying drawings, like reference characters designate the same or similar parts throughout the several views. 
   The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is best defined by the appended claims. 

   
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     In order that the invention may be more fully understood, it will now be described, by way of example, with reference to the accompanying drawing in which: 
       FIG. 1  is an illustrative view of the rekeyable lock of the present invention in use; 
       FIG. 2  is a planar view of the back end of the key cylinder of the rekeyable lock of the present invention; 
       FIG. 3  is a planar view of the back end of the key cylinder of the rekeyable lock of the present invention; 
       FIG. 4  is a perspective view of the rekeyable lock of the present invention; 
       FIG. 5  is an exploded view of the rekeyable lock of the present invention; and 
       FIG. 6  is a cross sectional view of the rekeyable lock of the present invention. 
   

   DESCRIPTION OF THE REFERENCED NUMERALS 
   Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views, the Figures illustrate the rekeyable lock of the present invention. With regard to the reference numerals used, the following numbering is used throughout the various drawing figures.
           10  rekeyable lock mechanism of the present invention     12  housing     14  sleeve pin sets     15  core pin sets     16  inner sleeve     17  springs     18  outer sleeve     19  sleeve pin covers     20  mounting bracket     21  screws     22  lock core     24  door     28  key hole     30  face plate     32  rear plate     34  cover plate     36  retaining ring     38  pin release     40  lock cylinder     42  preset apertures     46  door handle     48  door handle frame       

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The following discussion describes in detail one embodiment of the invention (and several variations of that embodiment). This discussion should not be construed, however, as limiting the invention to those particular embodiments; practitioners skilled in the art will recognize numerous other embodiments as well. For definition of the complete scope of the invention, the reader is directed to appended claims. 
   Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several views,  FIGS. 1 through 6  illustrate a rekeyable lock mechanism of the present invention which is indicated generally by the reference numeral  10 . 
     FIG. 1  is an illustrative view of the rekeyable lock mechanism  10  of the present invention in use, hereinafter referred to as the “lock mechanism”. Shown herein, three locks  10  are positioned within a door  24  to allow the door  24  to be locked and unlocked. The lock mechanism  10  can be located in a plurality of positions on the door  24 . Herein, identical lock mechanisms  10  are located within the door handle  46 , within the frame surrounding the door handle  48 , and within the door  24  itself. The lock mechanism  10  has a housing  12 , sleeve pin sets  14 , core pin sets  15 , an inner sleeve  16 , an outer sleeve  18 , a mounting bracket  20 , and a lock core  22 . The lock core  22  has the inner sleeve  16  positioned therearound and the outer sleeve  18  is positioned around the inner sleeve  16 . The housing  12  is positioned around the outer sleeve  18 . The mounting bracket  20  contains the housing  12  and is attached within the door  24 . 
   The lock mechanism  10  is a pin and tumbler lock whereby one of a plurality of rows of sleeve pin sets  14  can be selectively positioned in a keyway. Each pin set formation requires a key specifically mated to that formation to be inserted into the look cylinder  40  to unlock the lock mechanism  10 . However, the lock mechanism  10  also includes a master key receivable within the lock cylinder  40  for unlocking all pin formations. Additionally when the master key is inserted into the lock cylinder  40 , the lock cylinder  40  may be removed from its housing  12  to make the changing the pin formation of the lock mechanism  10  accessible. To change the lock mechanism  10 , a lever is used to move one of the plurality of rows of sleeve pin sets  14  into the operative position. 
     FIG. 2  is a planar view of the back end of the key cylinder of the lock mechanism  10  of the present invention. The lock mechanism  10  has a housing  12 , sleeve pin sets  14 , core pin sets  15 , an inner sleeve  16 , an outer sleeve  18 , a mounting bracket  20 , and a lock core  22 . The lock core  22  has the inner sleeve  16  positioned therearound and the outer sleeve  18  is positioned around the inner sleeve  16 . The outer sleeve  18  and the inner sleeve  16 , which when assembled together, are referred to as the lock cylinder  40 . The housing  12  is positioned around the outer sleeve  18 . The mounting bracket  20  contains the housing  12  and is attached to the door  24 , shown in  FIG. 1 . 
   The lock mechanism  10  is a pin and tumbler lock whereby one of a plurality of rows of sleeve pin sets  14  can be selectively positioned in a keyway. Embedded in the lock cylinder  40  is a plurality of rows extending through and along a length of each of the inner sleeve  16  and outer sleeve  18  forming preset apertures  42  which receive the sleeve pin sets  14 , shown in  FIG. 5 . The orientation of the sleeve pin sets  14  in the preset apertures  42  will hereinafter be referred to as the pin set formation. Each pin formation requires a key specifically mated to that formation to be inserted into the lock cylinder  40  to unlock the lock mechanism  10 . However, the lock mechanism  10  also includes a master key receivable within the lock cylinder  40  for unlocking all pin formations. Additionally when the master key is inserted into the lock cylinder  40 , the lock cylinder  40  may be removed from its housing  12  to make changing the pin formation of the lock mechanism  10  accessible. 
   To change the pin set formation and thereby change the key require to unlock the lock mechanism  10 , a master key is used to remove the lock cylinder  40  and then a lever is used to rotate the lock cylinder  40  in a clockwise direction. The lock cylinder  40  is rotated to one of a plurality of pin set formations and the internal lock mechanism will turn and mechanically adjust to act the key that corresponds to that pin set formation. 
     FIG. 3  is a planar view of the back end of the key cylinder of the lock mechanism  10  of the present invention. The lock mechanism  10  has a housing  12 , sleeve pin sets  14 , core pin sets  15 , an inner sleeve  16 , an outer sleeve  18 , a mounting bracket  20 , and a lock core  22 . The lock core  22  has the inner sleeve  16  positioned therearound and the outer sleeve  18  is positioned around the inner sleeve  16 . The outer sleeve  18  and the inner sleeve  16 , which when assembled together, are referred to as the lock cylinder  40 . The housing  12  is positioned around the outer sleeve  18 . The mounting bracket  20  contains the housing  12  and is attached to the door  24 , shown in  FIG. 1 . 
   As shown in  FIG. 2 , to change the pin set formation and thereby change the key that will fit the lock mechanism  10 , a master key is used to remove the lock cylinder  40  and then a lever is used to rotate the lock cylinder  40  in a clockwise direction. The lock cylinder  40  is rotated in a clockwise direction to one of a plurality of pin set formations and the internal lock mechanism will turn and mechanically adjust to accept the key that corresponds to that pin set formation. 
     FIG. 4  is a perspective view of the lock mechanism  10  of the present invention. Shown herein is the lock mechanism  10  fully assembled as it would be in a door  24  as in  FIG. 1  whereby the mounting bracket  20  is fit within an aperture of the door to securely hold the lock mechanism  10  therein. The mounting bracket  20  has a first end and a second end. Attached to the first end of the mounting bracket  20  is a face plate  30 , which is visible on the external surface of the door  24 . The face plate  30  has an aperture through which a key hole  28  is visible and accessible. Attached to the second end of the mounting bracket  20  is a rear plate  32 . A cover plate  34  covers the rear plate  32  to prevent tampering with the lock mechanism. To change the pin set formation and thereby change the key that will fit the lock mechanism  10 , a master key is inserted into key hole  28  and turned counter clockwise thereby allowing the lock cylinder  40  to be extracted. After removal, a lever is used to rotate the lock cylinder  40  in a clockwise direction to the desired pin set formation. 
     FIG. 5  is an exploded view of the lock mechanism  10  of the present invention. Shown is the lock mechanism  10  exploded into its individual components including a lock core  22  and a plurality of sleeves  16  and  18 . The sleeves  16  and  18  contain aligned preset apertures  42  for receiving pin sets formations. The pin set formations are made from a plurality of sleeve pin sets  14 . The sleeve pin sets  14  may be selectively positioned to create varying placements of break lines within the lock mechanism  10 , allowing for multiple lock settings to be contained within a single lock assembly  10 . 
   The lock core  22  is cylindrically shaped and has a plurality of preset apertures  42  for receiving core pin sets  15 . The lock core  22  also has a key hole  28  for receiving at least one of a key and a masterkey therein. The lock core  22  is positioned within a bore extending through the inner sleeve  16 . The inner sleeve  16  is cylindrically shaped and has a plurality of preset apertures  42  for receiving sleeve pin sets  14 . The inner sleeve  16  is positioned within a bore extending through the outer sleeve  18 . The outer sleeve  18  is cylindrically shaped and has a plurality of preset apertures  42  for receiving a respective one of the plurality of the sleeve pin sets  14 . The sleeve pin sets  14  pass through the preset apertures  42  in both the outer sleeve  18  and the inner sleeve  16 . Each sleeve pin set  14  is formed from two different length pins, however, the total length of each set is equal to the length of the pins forming the other pin sets  14 . Each set has a first end and a second end. The first end of the set passes through the outer sleeve  18  and the inner sleeve  16  and rests within the inner sleeve  16 . The second end of the set extends into the outer sleeve  18  and may partially extend into the inner sleeve  16  depending on the length thereof. Springs  17  are received within respective apertures of the outer sleeve  18  and are adjacent to the second end of the respective sleeve pin sets  14 . Sleeve pin covers  19  prevent the sleeve pin sets  14  and the springs  17  from falling out of the lock assembly  10 . 
   The outer sleeve  18  is inserted within the cylindrically shaped housing  12 . The housing  12  is located within the cylindrically shaped mounting bracket  20 . Located between the housing  12  and a rear plate  32  is a retaining ring  36  for securing the housing  12 . The housing  12  and the retaining ring  36  are positioned within the mounting bracket  20 . The rear plate  32  covers the back of the mounting bracket  20 . The rear plate  32  is attached to the mounting bracket  20  by a plurality of screws  21  passing through a plurality of corresponding apertures. The rear plate  32  is covered by the cover plate  34  to prevent tampering with the locking mechanism  10 . 
     FIG. 6  is a cross sectional view of the lock mechanism  10  of the present invention. Shown herein is the lock mechanism  10  having a plurality of sleeves  16  and  18  that work in cooperation with a plurality of pin sets  14  with each pin set having a plurality of differently sized pins to allow the user to simply rotate the outer  18  and inner sleeve  16  to change the lock setting. The entire lock mechanism  10  is encapsulated in the mounting bracket  20 . 
   The lock core  22  is cylindrically shaped and has a plurality of preset apertures  42  for receiving core pin sets  15 . The lock core  22  also has a key hole  28  for receiving at least one of a key and a masterkey therein. The lock core  22  is positioned within a bore extending through the inner sleeve  16 . The inner sleeve  16  is cylindrically shaped and has a plurality of preset apertures  42  for receiving sleeve pin sets  14 . The inner sleeve  16  is positioned within a bore extending through the outer sleeve  18 . The outer sleeve  18  is cylindrically shaped and has a plurality of preset apertures  42  for receiving a respective one of the plurality of the sleeve pin sets  14 . The sleeve pin sets  14  pass through the preset apertures  42  in both the outer sleeve  18  and the inner sleeve  16 . Each sleeve pin set  14  is formed from two different length pins, however, the total length of each set is equal to the length of the pins forming the other pin sets  14 . Each set has a first end and a second end. The first end of the set passes through the outer sleeve  18  and the inner sleeve  16  and rests within the inner sleeve  16 . The second end of the set extends into the outer sleeve  18  and may partially extend into the inner sleeve  16  depending on the length thereof. Springs  17  are received within respective apertures of the outer sleeve  18  and are adjacent to the second end of the respective sleeve pin sets  14 . Sleeve pin covers  19  prevent the sleeve pin sets  14  and the springs  17  from falling out of the lock assembly  10 . 
   The outer sleeve  18  is inserted within the cylindrically shaped housing  12 . The housing  12  is located within the cylindrically shaped mounting bracket  20 . Located between the housing  12  and a rear plate  32  is a retaining ring  36  for securing the housing  12 . The housing  12  and the retaining ring  36  are positioned within the mounting bracket  20 . The rear plate  32  covers the back of the mounting bracket  20 . The rear plate  32  is attached to the mounting bracket  20  by a plurality of screws  21  passing through a plurality of corresponding apertures. The rear plate  32  is covered by the cover plate  34  to prevent tampering with the locking mechanism  10 . 
   To change the pin set  14  formation, a master key is inserted into the lock core  22  and turned counter clockwise. Turning the master key counterclockwise triggers a pin release  38  which allows the lock cylinder  40  to be rotated to change the pin set formation. 
   While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 
   Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.