Patent Publication Number: US-2019169877-A1

Title: Lock assembly

Description:
TECHNICAL FIELD 
     This document relates to the technical field of (and is not limited to) a lock assembly, and/or to a lock assembly including visibly movable symbols, and/or to a lock assembly configured to be selectively coupled to a selectively-movable lock member of a mortise-cylinder housing of a mortise cylinder (in which the lock assembly includes visibly movable symbols), and/or a method therefor. 
     BACKGROUND 
     Commercial or industrial door systems are installed with a latch housing. The latch housing is installed in an edge section of the door system. A mortise cylinder is installed to (and is removable from) the latch housing. A key is made to operate the internal mechanisms mounted in (installed in) the interior of the mortise cylinder. It will be appreciated that there are mechanisms that take (receive) the mortise cylinder for utilization with residential locks (for example, mortise cassettes, and/or for application with residential situations). Moreover, the mortise cylinder is typically utilized for commercial situations or applications (but not limited to only commercial applications). It will be appreciated that the latch housing may include a latch mechanism and/or any equivalent thereof, such as a bolt-action mechanism, etc. 
     SUMMARY 
     It will be appreciated that there exists a need to mitigate (at least in part) at least one problem associated with the existing locks (also called the existing technology). After much study of the known systems and methods with experimentation, an understanding (at least in part) of the problem and its solution has been identified (at least in part) and is articulated (at least in part) as follows: 
     For the case where a replacement key is required for an existing mortise cylinder (which has an existing key), the existing mortise cylinder is simply removed from the mortise housing, and is then replaced with a replacement mortise cylinder that has a replacement key that is matched with the replacement mortise cylinder. The existing key and the existing mortise cylinder are discarded (or may be redeployed for or reinstalled in (to) another door system, if so desired). 
     Some users find it very inconvenient to utilize keys for a mortise cylinder for the case where the existing key is lost or misplaced, which then requires the undesired or inconvenient replacement of the existing mortise cylinder. It will be appreciated that locks do not necessarily need to be changed, and that the locks may be rekeyed (if desired). 
     What may be needed is a way to improve the convenience for users of mortise cylinders. 
     To mitigate, at least in part, at least one problem associated with the existing technology, there is provided (in accordance with a major aspect) an apparatus. The apparatus includes and is not limited to (comprises) a lock assembly configured to be selectively coupled to a selectively-movable lock member of a mortise-cylinder housing of a mortise cylinder. The lock assembly includes visible symbols configured to be selectively movable. This is done in such a way that the visible symbols, in use, urge the selectively-movable lock member of the mortise-cylinder housing of the mortise cylinder to move from a locked state to an unlocked state. 
     In accordance with an embodiment, the lock assembly is to be installed in a building having a stationary wall. A stationary door frame is configured to be mounted to the stationary wall of the building. A movable door is configured to be mounted to the stationary door frame. The movable door is also configured to be selectively movable between a door-closed condition and a door-open condition. A latch housing is configured to be mounted in an edge section of the movable door in such a way that the latch housing, in use, faces the stationary door frame once the latch housing is mounted in the edge section of the movable door. The movable door is moved from an open-door condition to a closed-door condition. The latch housing supports a latch device (and any equivalent thereof, such as a bolt-action device, etc.). The latch device is configured to selectively latch (or selectively bolt) with the stationary door frame once the latch housing, in use, is mounted in the edge section of the movable door, and once the latch housing, in use, faces the stationary door frame in such a way that the latch device, in use, securely prevents movement of the movable door away from the stationary door frame, and the movable door, in use, remains in the door-closed condition with the latch device placed in a latched condition. The latch device is configured to selectively unlatch (or selectively unbolt) from the stationary door frame in such a way that the latch device, in use, permits free movement of the movable door away from the stationary door frame, and the movable door is movable to the door-open condition with the latch device placed in an unlatched condition. The mortise-cylinder housing is configured to be selectively receivable by, and supportable by, and selectively removable from, the latch housing. The mortise-cylinder housing supports the selectively-movable lock member. The selectively-movable lock member is configured to interface with the latch device of the latch housing once the mortise-cylinder housing, in use, is received by, and supported by, the latch housing. 
     Other aspects are identified in the claims. Other aspects and features of the non-limiting embodiments may now become apparent to those skilled in the art upon review of the following detailed description of the non-limiting embodiments with the accompanying drawings. This Summary is provided to introduce concepts in simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the disclosed subject matter, and is not intended to describe each disclosed embodiment or every implementation of the disclosed subject matter. Many other novel advantages, features, and relationships will become apparent as this description proceeds. The figures and the description that follow more particularly exemplify illustrative embodiments. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The non-limiting embodiments may be more fully appreciated by reference to the following detailed description of the non-limiting embodiments when taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  to  FIG. 40  depict views in accordance with aspects of a first embodiment of a lock assembly; and 
         FIG. 41  to  FIG. 65  depict views in accordance with aspects of a second embodiment of a lock assembly; and 
       more specifically: 
         FIG. 1  depicts a perspective view of a first embodiment of a lock assembly; and 
         FIG. 2  and  FIG. 3  depict front views of embodiments of the lock assembly of  FIG. 1  and of  FIG. 41  ( FIG. 2  and  FIG. 3  are both applicable to the first and second embodiments); and 
         FIG. 4  and  FIG. 5  depict a front view ( FIG. 4 ) and a side view ( FIG. 5 ) of embodiments of the lock assembly of  FIG. 1 ; and 
         FIG. 6  and  FIG. 7  depict a perspective view ( FIG. 6 ) and a cross-sectional side view ( FIG. 7 ) of embodiments of the lock assembly of  FIG. 1 ; and 
         FIG. 8  and  FIG. 9  depict a cross-sectional side view ( FIG. 8 ) and a cross-sectional front view ( FIG. 9 ) of embodiments of the lock assembly of  FIG. 6 ; and 
         FIG. 10  and  FIG. 11  depict a cross-sectional bottom view ( FIG. 10 ) and a perspective view ( FIG. 11 ) of embodiments of the lock assembly of  FIG. 6 ; and 
         FIG. 12 ,  FIG. 13  and  FIG. 14  depict a side view ( FIG. 12 ), a front view ( FIG. 13 ) and a side view ( FIG. 14 ) of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 15  and  FIG. 16  depict a side view ( FIG. 15 ) and a front view ( FIG. 16 ) of embodiments of the lock assembly of  FIG. 6 ; and 
         FIG. 17  and  FIG. 18  depict a side view ( FIG. 17 ) and a front view ( FIG. 18 ) of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 19 ,  FIG. 20A ,  FIG. 20B  and  FIG. 21  depict front views ( FIG. 19 ,  FIG. 20A  and  FIG. 21 ) and a side view ( FIG. 20B ) of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 22  depicts a side view of an embodiment of the lock assembly of  FIG. 6 ; and 
         FIG. 23 ,  FIG. 24 ,  FIG. 25  and  FIG. 26  depict a side view ( FIG. 23 ), a top view ( FIG. 24 ), an end view ( FIG. 25 ) and a cross-sectional view ( FIG. 26 ) of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 27  to  FIG. 30  depict side views of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 31  to  FIG. 34  depict side views of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 35  depicts a cross-sectional view of an embodiment of the lock assembly of  FIG. 6 ; and 
         FIG. 36  depicts an end view of an embodiment of the lock assembly of  FIG. 35 ; and 
         FIG. 37  depicts a cross-sectional view of an embodiment of the lock assembly of  FIG. 6 ; and 
         FIG. 38  depicts an end view of an embodiment of the lock assembly of  FIG. 37 ; and 
         FIG. 39  and  FIG. 40  depict an end view ( FIG. 39 ) and a side view ( FIG. 40 ) of embodiments of the lock assembly of  FIG. 7 ; and 
         FIG. 41  depicts a perspective view of a second embodiment of a lock assembly; and 
         FIG. 42  and  FIG. 43  depict side views of embodiments of the lock assembly of  FIG. 41 ; and 
         FIG. 44  and  FIG. 45  depict a perspective view ( FIG. 44 ) and a side view ( FIG. 45 ) of embodiments of the lock assembly of  FIG. 41 ; and 
         FIG. 46  and  FIG. 47  depict front views of embodiments of the lock assembly of  FIG. 45 ; and 
         FIG. 48  depicts a side view of an embodiment the lock assembly of  FIG. 41 ; and 
         FIG. 49  depicts a side view of an embodiment the lock assembly of  FIG. 41 ; and 
         FIG. 50  and  FIG. 51  depict a front view ( FIG. 50 ) and a rear view ( FIG. 51 ) of embodiments of the lock assembly of  FIG. 41 ; and 
         FIG. 52 ,  FIG. 53  and  FIG. 54  depict a front view ( FIG. 52 ), a rear view ( FIG. 53 ) and a perspective view ( FIG. 54 ) of embodiments of the lock assembly of  FIG. 41 ; and 
         FIG. 55  and  FIG. 56  depict perspective views of embodiments of the lock assembly of  FIG. 41 ; and 
         FIG. 57  to  FIG. 60  depict end views of embodiments of the lock assembly of  FIG. 41 ; 
       and 
         FIG. 61  depicts a perspective view of an embodiment of the lock assembly of  FIG. 41 ; and 
         FIG. 62  depicts a cross-sectional view of an embodiment of the lock assembly of  FIG. 61 ; and 
         FIG. 63  depicts a rear view of an embodiment of the lock assembly of  FIG. 62 ; and 
         FIG. 64  depicts a cross-sectional view of an embodiment of the lock assembly of  FIG. 61 ; and 
         FIG. 65  depicts a rear view of an embodiment of the lock assembly of  FIG. 64 . 
     
    
    
     The drawings are not necessarily to scale and may be illustrated by phantom lines, diagrammatic representations and fragmentary views. In certain instances, details unnecessary for an understanding of the embodiments (and/or details that render other details difficult to perceive) may have been omitted. Corresponding reference characters indicate corresponding components throughout the several figures of the drawings. Elements in the several figures are illustrated for simplicity and clarity and have not been drawn to scale. The dimensions of some of the elements in the figures may be emphasized relative to other elements for facilitating an understanding of the various disclosed embodiments. In addition, common, but well-understood, elements that are useful or necessary in commercially feasible embodiments are often not depicted to provide a less obstructed view of the embodiments of the present disclosure. 
     LISTING OF REFERENCE NUMERALS USED IN THE DRAWINGS 
     
         
         
           
               100  lock assembly 
               102  visible symbols 
               202  turn handle 
               204  turn shaft 
               206  dial 
               207  reference marker 
               208  dial shaft 
               209  shaft groove 
               210  threads 
               212  front plate 
               214  turn-shaft gear 
               216  rotation axis 
               218  gear shaft 
               220  gear 
               222  slide spring 
               224  slide device 
               225 A first channel 
               225 B second channel 
               225  slide channel 
               226  first tumbler disk 
               227  crown 
               228  second tumbler disk 
               230  third tumbler disk 
               232  tumbler retainer 
               234  back plate 
               236  slide channel 
               238  slide body 
               302  main housing 
               304  removable housing 
               306  turn handle 
               308  first numbered dial 
               310  second numbered dial 
               312  third numbered dial 
               314  fourth numbered dial 
               320  holder 
               322  first gear 
               324  second gear 
               326  third gear 
               328  fourth gear 
               330  dial shaft 
               332  first tumbler disc 
               333  first notch 
               334  second tumbler disc 
               335  second notch 
               336  third tumbler disc 
               337  third notch 
               338  fourth tumbler disc 
               339  fourth notch 
               340  first tumbler disc gear 
               342  second tumbler disc gear 
               344  third tumbler disc gear 
               346  fourth tumbler disc gear 
               348  tumbler disc shaft 
               350  key 
               352  turnkey adapter 
               353  key notch 
               354  turn shaft 
               355  mating notch 
               402  first hole 
               404  second hole 
               406  third hole 
               408  first extension member 
               410  fourth hole 
               412  fifth hole 
               414  first lock hole 
               416  first angle 
               418  first central hole 
               420  second lock hole 
               422  second central hole 
               424  second extension member 
               426  second angle 
               428  third lock hole 
               430  third central hole 
               432  third extension member 
               434  third angle 
               436  retainer hole 
               438  gear hole 
               442  slide hole 
               900  mortise-cylinder housing 
               901  mortise cylinder 
               902  selectively-movable lock member 
               903  keyway 
               904  stationary door frame 
               906  latch device 
               908  latch housing 
               910  edge section 
               912  movable door 
               914  stationary wall 
               916  building 
               918  flange assembly 
               922  gap 
           
         
       
    
     DETAILED DESCRIPTION OF THE NON-LIMITING EMBODIMENT(S) 
     The following detailed description is merely exemplary and is not intended to limit the described embodiments or the application and uses of the described embodiments. As used, the word “exemplary” or “illustrative” means “serving as an example, instance, or illustration.” Any implementation described as “exemplary” or “illustrative” is not necessarily to be construed as preferred or advantageous over other implementations. All of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure. The scope of the claim is defined by the claims (in which the claims may be amended during patent examination after the filing of this application). For the description, the terms “upper,” “lower,” “left,” “rear,” “right,” “front,” “vertical,” “horizontal,” and derivatives thereof shall relate to the examples as oriented in the drawings. There is no intention to be bound by any expressed or implied theory in the preceding Technical Field, Background, Summary or the following detailed description. It is also to be understood that the devices and processes illustrated in the attached drawings, and described in the following specification, are exemplary embodiments (examples), aspects and/or concepts defined in the appended claims. Hence, dimensions and other physical characteristics relating to the embodiments disclosed are not to be considered as limiting, unless the claims expressly state otherwise. It is understood that the phrase “at least one” is equivalent to “a”. The aspects (examples, alterations, modifications, options, variations, embodiments and any equivalent thereof) are described regarding the drawings. It should be understood that the invention is limited to the subject matter provided by the claims, and that the invention is not limited to the particular aspects depicted and described. It will be appreciated that the scope of the meaning of a device configured to be coupled to an item (that is, to be connected to, to interact with the item, etc.) is to be interpreted as the device being configured to be coupled to the item, either directly or indirectly. Therefore, “configured to” may include the meaning “either directly or indirectly” unless specifically stated otherwise. 
       FIG. 1  to  FIG. 40  depict views in accordance with aspects of a first embodiment of a lock assembly  100 . Specifically,  FIG. 1  depicts a perspective view,  FIG. 2  and  FIG. 3  depict front views,  FIG. 4  depicts a front view,  FIG. 5  depicts a side view,  FIG. 6  depicts a perspective view,  FIG. 7  depicts a cross-sectional side view,  FIG. 8  depicts a cross-sectional side view,  FIG. 9  depicts a cross-sectional front view,  FIG. 10  depicts a cross-sectional bottom view,  FIG. 11  depicts a perspective view,  FIG. 12  depicts a side view,  FIG. 13  depicts a front view,  FIG. 14  depicts a side view,  FIG. 15  depicts a side view,  FIG. 16  depicts a front view,  FIG. 17  depicts a side view,  FIG. 18  depicts a front view,  FIG. 19 ,  FIG. 20A  and  FIG. 21  depict front views,  FIG. 20B  depicts a side view,  FIG. 22  depicts a side view,  FIG. 23  depicts a side view,  FIG. 24  depicts a top view,  FIG. 25  depicts an end view,  FIG. 27  to  FIG. 30  depict side views,  FIG. 31  to  FIG. 34  depict side views,  FIG. 35  depicts a cross-sectional view,  FIG. 36  depicts an end view,  FIG. 37  depicts a cross-sectional view,  FIG. 38  depicts an end view,  FIG. 39  depicts an end view, and  FIG. 40  depicts a side view. 
       FIG. 41  to  FIG. 65  depict views in accordance with aspects of a second embodiment of a lock assembly  100 . More specifically,  FIG. 41  depicts a perspective view,  FIG. 42  and  FIG. 43  depict side views,  FIG. 44  depicts a perspective view,  FIG. 45  depicts a side view,  FIG. 46  and  FIG. 47  depict front views,  FIG. 48  depicts a side view,  FIG. 49  depicts a side view,  FIG. 50  depicts a front view,  FIG. 51  depicts a rear view,  FIG. 52  depicts a front view,  FIG. 53  depicts a rear view,  FIG. 54  depicts a perspective view,  FIG. 55  and  FIG. 56  depict perspective views,  FIG. 57  to  FIG. 60  depict end views,  FIG. 61  depicts a perspective view,  FIG. 62  depicts a cross-sectional view,  FIG. 63  depicts a rear view,  FIG. 64  depicts a cross-sectional view, and  FIG. 65  depicts a rear view. 
     In accordance with the first and second embodiments as depicted in  FIG. 1 ,  FIG. 2 ,  FIG. 3  and  FIG. 41 , there is provided an apparatus, in which the apparatus includes (and is not limited to) a synergistic combination of elements. The apparatus is for (is configured for) utilization with a selectively-movable lock member  902  (also called a lock member) of (mounted to) a mortise-cylinder housing  900  of a mortise cylinder  901 . The apparatus includes (and is not limited to) a lock assembly  100 . The lock assembly  100  is configured to be selectively coupled to the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901 . 
       FIG. 2  and  FIG. 3  are each applicable to the first embodiment and the second embodiment. In accordance with the first and second embodiments as depicted in  FIG. 2  and  FIG. 3 , a building  916  has a stationary wall  914 . A stationary door frame  904  is configured to be mounted to the stationary wall  914  of the building  916 . A movable door  912  is configured to be mounted to (preferably, pivotally mounted to) the stationary door frame  904 . The movable door  912  is also configured to be selectively movable between a door-closed condition (as depicted in  FIG. 2 ) and a door-open condition (as depicted in  FIG. 3 ). 
     In accordance with the first and second embodiments as depicted in  FIG. 1 ,  FIG. 2 ,  FIG. 3  and  FIG. 41 , a latch housing  908  is configured to be mounted in an edge section  910  of the movable door  912 . This is done in such a way that the latch housing  908 , in use, faces the stationary door frame  904  once the latch housing  908  is mounted (as depicted in  FIG. 2 ) in the edge of the movable door  912 , and once the movable door  912  is moved (as depicted in  FIG. 2 ) from the open-door condition to the closed-door condition. The latch housing  908 , in use, supports (has, includes, or is configured to support) a latch device  906  (also called a movable latch device). An embodiment of the latch housing  908  is manufactured by the ADAMS RITE Company, which is located in Arizona, U.S.A. It will be appreciated that the latch housing  908  may include (and is not limited to) a latch mechanism and/or any equivalent thereof, such as a bolt-action mechanism, etc. It will be appreciated that the term “latch” may include any mechanism or device configured to take (receive) a mortise cylinder (such as, a mortise cassette, ADAMS RITE (TRADEMARK) device (ADAMS RITE is a trademark of the Adams Rite Company based in Arizona, USA), a detex unit, the exterior side of a push bar, etc., and any other kind or any equivalent thereof), and that the concept is suitable for any mechanisms utilized in the industry. 
     In accordance with  FIG. 2  (which is applicable to both the first and second embodiments), the latch device  906  is configured to selectively latch (selectively bolt or selectively couple) with the stationary door frame  904  once the latch housing  908 , in use, is mounted in the edge section  910  of the movable door  912 , and once the latch housing  908 , in use, faces the stationary door frame  904 . This is done in such a way that (A) the latch device  906 , in use, securely prevents movement of the movable door  912  away from the stationary door frame  904 , and (B) the movable door  912 , in use, remains in the door-closed condition with the latch device  906  placed in a latched condition. 
     In accordance with  FIG. 3  (which is applicable to both the first and second embodiments), the latch device  906  is configured to selectively unlatch (selectively unbolt or selectively decouple) from the stationary door frame  904 . This is done in such a way that (A) the latch device  906 , in use, permits free movement of the movable door  912  away from the stationary door frame  904 , and (B) the movable door  912  is movable to the door-open condition with the latch device  906  placed in an unlatched condition. 
     A technical advantage applicable to both the first and second embodiments is that there may be fewer service calls required for the case where the lock assembly  100  may be reset (if desired) without requiring a service call from a locksmith. In addition, access control may be less of a concern for the case where a key cannot be handed to undesirables to be used at any time. 
     In accordance with the embodiments as depicted in  FIG. 1 ,  FIG. 2 ,  FIG. 3  and  FIG. 41 , a mortise-cylinder housing  900  (of a mortise cylinder  901 ) is configured to be selectively receivable by, and supportable by, and selectively removable from, the latch housing  908 . Preferably, this is done (occurs) once the latch housing  908  is mounted in the edge of the movable door  912 . 
     In accordance with the first and second embodiments as depicted in  FIG. 1 ,  FIG. 2 ,  FIG. 3  and  FIG. 41 , the mortise-cylinder housing  900  supports (includes, has or is configured to support) a selectively-movable lock member  902  (also called a door-lock cam, and any other kind, and any equivalent thereof). The selectively-movable lock member  902  is configured to interface with the latch device  906  of the latch housing  908  once the mortise-cylinder housing  900 , in use, is received by, and supported by, the latch housing  908 . 
     A lock assembly  100  is configured to be selectively coupled to (to be interfaced with) the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901 . 
     For instance, in accordance with the first embodiment (as depicted in  FIG. 1 ), the lock assembly  100  is configured to be received and contained in the mortise-cylinder housing  900  of the mortise cylinder  901 . The lock assembly  100  is configured to be directly selectively coupled to the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901 . This is done in such a way that the lock assembly  100  is received within (and preferably remains within) an interior of the mortise-cylinder housing  900  of the mortise cylinder  901 . It will be appreciated that in accordance with the first embodiment, the lock assembly  100  and the mortise cylinder  901  are integrated into a single unit (and the single unit is to be installed to, or in, the latch housing  908 , in which the latch housing  908  is installed to and supported by the movable door  912 ). For instance, for the case where an existing mortise cylinder is to be removed (in which the existing mortise cylinder is standard existing equipment) from the latch housing  908 , and then is to be replaced with a new mortise cylinder, the combination of the lock assembly  100  and the mortise cylinder  901  is installed (in place of the existing mortise cylinder), as a single unit, to the latch housing  908 . For the first embodiment, the lock assembly  100  and the mortise cylinder  901  are not selectively user removable from each other. 
     For instance, in accordance with the second embodiment (as depicted in  FIG. 41 ), the lock assembly  100  is configured to not be received and contained in the mortise-cylinder housing  900  of the mortise cylinder  901 , and the lock assembly  100  is configured to be retrofitted to an existing (conventional) mortise-cylinder housing of a mortise cylinder. The lock assembly  100  is configured to be indirectly selectively coupled to the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901 . This is done in such a way that the lock assembly  100  is positioned exteriorly of the mortise-cylinder housing  900  of the mortise cylinder  901 . The lock assembly  100  is coupled (either directly or indirectly) to, for instance, an exterior portion of the mortise-cylinder housing  900  of the mortise cylinder  901 . It will be appreciated that in accordance with the second embodiment, the lock assembly  100  and the mortise cylinder  901  are selectively removable (user removable) from each other (preferably while the mortise cylinder  901 , in use, remains supported by the latch housing  908 ). Preferably, the lock assembly  100  and the mortise cylinder  901  are selectively removable from each other while the mortise cylinder  901 , in use, remains supported by (and received by) the latch housing  908  (in which the latch housing  908  is installed to and supported by the movable door  912 ). For instance, for the case where it is not required to remove an existing mortise cylinder (in which the existing mortise cylinder is standard existing equipment) from the latch housing  908 , the lock assembly  100  is installed to the existing mortise cylinder that is (or remains) installed to the latch housing  908 . 
     In accordance with the first and second embodiments as depicted in  FIG. 1 ,  FIG. 2 ,  FIG. 3  and  FIG. 41 , the lock assembly  100  includes visible symbols  102 . The visible symbols  102  are configured to be selectively movable. This is done in such a way that the visible symbols  102 , in use, urge the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901  to move from a locked state to an unlocked state. 
     In accordance with the first embodiment (as depicted in  FIG. 1 ), the lock assembly  100  is configured to be received in, and mounted within, an interior of the mortise-cylinder housing  900  of the mortise cylinder  901 . The visible symbols  102  are positioned exteriorly of the mortise-cylinder housing  900  of the mortise cylinder  901  once the lock assembly  100  is received in, and mounted within, the interior of the mortise-cylinder housing  900  of the mortise cylinder  901 . 
     In accordance with the second embodiment as depicted in  FIG. 41 , the lock assembly  100  is configured to interface with a key  350 . The key  350  is configured to be received, at least in part, into a keyway  903  of the mortise cylinder  901  (as depicted in the embodiment of  FIG. 44 ). The lock assembly  100  is configured to be selectively coupled to the selectively-movable lock member  902  of the mortise-cylinder housing  900  of the mortise cylinder  901  via the key  350 . The lock assembly  100  is configured to be positioned exteriorly of the mortise-cylinder housing  900  of the mortise cylinder  901  once the key  350 , in use, is received, at least in part, into the keyway  903  of the mortise cylinder  901 . The visible symbols  102  are positioned exteriorly of the mortise-cylinder housing  900  of the mortise cylinder  901 . The lock assembly  100  and the mortise cylinder  901  are selectively removable from each other while the mortise cylinder  901 , in use, remains supported by the latch housing  908 . 
     In accordance with the embodiments as depicted in  FIG. 37  (which depicts the first embodiment) and  FIG. 62  (which depicts the second embodiment), the visible symbols  102  are configured to be positionable in the locked state in which the visible symbols  102 , in use, do not move the selectively-movable lock member  902 , and the selectively-movable lock member  902 , in use, does not move the latch device  906  from the latched condition (as depicted in  FIG. 2 ) to the unlatched condition (as depicted in  FIG. 3 ). 
     In accordance with the embodiments as depicted in  FIG. 35  (which depicts the first embodiment), and  FIG. 64  (which depicts the second embodiment), the visible symbols  102  are configured to be positionable in the unlocked state in which the visible symbols  102 , in use, move the selectively-movable lock member  902 , and (in response) the selectively-movable lock member  902 , in use, moves the latch device  906  from the latched condition (as depicted in  FIG. 2 ) to the unlatched condition (as depicted in  FIG. 3 ). 
     In accordance with the embodiment as depicted in  FIG. 2  (applicable to both the first and second embodiments), in the latched condition, the latch device  906  is latched to the stationary door frame  904  so that the movable door  912  is immovably secured in the locked state with the stationary door frame  904 . 
     In accordance with the embodiment as depicted in  FIG. 3  (applicable to both the first and second embodiments), in the unlatched condition, the latch device  906  is unlatched from the stationary door frame  904  so that the movable door  912  is unlocked and free to be movable (moved) away from or toward the stationary door frame  904 . 
       FIG. 1  depicts a perspective view of the first embodiment of a lock assembly  100 . 
       FIG. 2  and  FIG. 3  depict front views of embodiments of the lock assembly  100  of  FIG. 1  and  FIG. 41  ( FIG. 2  and  FIG. 3  are both applicable to the first and second embodiments). 
       FIG. 4  and  FIG. 5  depict a front view ( FIG. 4 ) and a side view ( FIG. 5 ) of embodiments of the lock assembly  100  of  FIG. 1 . 
       FIG. 6  depicts a perspective view of an embodiment of the lock assembly  100  of  FIG. 1 . 
     In accordance with the embodiments as depicted in  FIG. 1  to  FIG. 6 , the lock assembly  100  includes a combination lock device. The lock assembly  100  is configured to selectively open and/or selectively close a pin-tumbler lock mechanism. The lock assembly  100  is configured to move the selectively-movable lock member  902  (also called a cam, etc.), and the selectively-movable lock member  902  (in response to being moved) then, in use, moves, or urges the movement of, the latch device  906 . Generally, the lock assembly  100  includes components configured to be movable, such as the visible symbols  102  (also called indicia, symbols, numbers, and any other kind, and any equivalent thereof). 
     In accordance with an embodiment, the lock assembly  100  is configured to be operable with a by-pass key (known and not depicted) in addition to utilization of the selective movement of the visible symbols  102 . In accordance with another embodiment, the lock assembly  100  is not configured to be operable with a by-pass key (known and not depicted) in addition to utilization of the movement of the visible symbols  102 . 
     Preferably, the lock assembly  100  includes a dial  206  (a movable dial, a combination dial, a dial face, etc.), and the visible symbols  102  (indicia) are placed on the outer surface of the dial  206 . The lock assembly  100  is configured to open only for the case where the dial  206  is turned through a predetermined sequence of predetermined positions (known in advance), in which the predetermined positions are identified on the dial face of the dial  206  by the visible symbols  102  (numbers, letters, and any other kind, and any equivalent thereof). For instance, the lock assembly  100  is configured to be opened for the case where a specific sequence of symbols (of the visible symbols  102 ) are displayed on the dial  206  (displayed relative to the reference marker  207 ). The lock assembly  100  is configured to be opened by rotating the dial  206  through a set of predetermined positions in a prescribed order and direction (a special sequence), and any other kind, and any equivalent thereof. 
     The lock assembly  100  is configured to operate by the movement of a sequence of symbols for opening the lock assembly  100  (a lock device). The sequence may be entered using a single rotating dial (such as, the dial  206 ) configured to interact with components (discs and/or cams, etc.). 
     In accordance with the first embodiment, the lock assembly  100  has the dial  206  (in which the mortise cylinder  901  does not present a keyway configured to receive a key for opening the lock contained in the mortise cylinder  901 ), in which the dial  206  is configured to be rotated to latch open or close the selectively-movable lock member  902  that is positioned on the latch housing  908 . 
     Preferably, the mortise-cylinder housing  900  of the mortise cylinder  901  is configured to be threaded and screwed into the latch housing  908  (in which the latch housing  908  has the latch device  906 ) that is mounted within the movable door  912 . The mortise cylinder  901  is configured to be held (supported) in place by the latch housing  908 . The latch housing  908  includes the selectively-movable lock member  902  (also called a cam) to actuate the latch device  906  positioned in the latch housing  908 . 
     In accordance with an embodiment, it will be appreciated that a controller (known and not depicted) and wires (known and not depicted) may be utilized for remote locking and/or unlocking of the latch device  906  positioned in the latch housing  908  (if so desired). 
     In accordance with the embodiments as depicted in  FIG. 1  to  FIG. 6 , the lock assembly  100  includes a turn handle  202 , a dial  206 , threads  210 , and a front plate  212 . The lock assembly  100  includes the dial  206 . The dial  206  includes a faceplate with numbers formed on the outer surface with graduations or liens extending radially toward the outer periphery of the dial  206 . The dial  206  is rotatably mounted to the mortise-cylinder housing  900  of the mortise cylinder  901 . 
     The front plate  212  is affixed to the front end section of the mortise-cylinder housing  900  of the mortise cylinder  901 . The front plate  212 , in use, faces away from the door once the mortise cylinder  901  is mounted to the door. 
     The mortise-cylinder housing  900  includes the threads  210  (configured to threadably connect with the latch housing  908 , as depicted in  FIG. 1 ). The front plate  212  is positioned behind the dial  206 . 
     The turn handle  202  is rotatably mounted to the mortise-cylinder housing  900 . The turn handle  202  extends through the central zone of the dial  206 . The turn handle  202  extends from the mortise-cylinder housing  900 . The dial  206  is positioned behind the turn handle  202 . The turn handle  202  is configured to be selectively rotated by a user in such a way that the turn handle  202 , in use, urges the rotation of the dial  206  (clockwise and/or counter clockwise). 
       FIG. 7  depicts a cross-sectional side view (which is taken along a cross-sectional line A-A of  FIG. 6 ) of the embodiments of the lock assembly  100  of  FIG. 6 . 
     In accordance with the embodiment as depicted in  FIG. 7 , the lock assembly  100  further includes a turn shaft  204  (in which the turn shaft  204  defines a shaft groove  209 ), a dial shaft  208  (combination dial shaft), a turn-shaft gear  214 , a rotation axis  216  (extending through the mortise-cylinder housing  900 ), a gear shaft  218 , a gear  220 , a slide spring  222 , a slide device  224  (in which the slide device  224  defines a slide channel  225 ), a first tumbler disk  226 , a second tumbler disk  228 , a third tumbler disk  230 , a tumbler retainer  232 , a back plate  234 , and a slide body  238  (in which the slide body  238  defines a slide channel  236 ). 
     The turn shaft  204  is configured to be selectively rotatable. The turn shaft  204  has a rotation axis  216  extending therethrough. The turn shaft  204  is configured to be rotatable about the rotation axis  216 . The rotation axis  216  extends through the turn shaft  204 . A distal end portion of the turn shaft  204  is configured to be affixed to the turn handle  202 . This is done in such a way that once the turn handle  202  is made to be rotatable by the user, the turn shaft  204  is accordingly selectively rotated. An end portion of the turn shaft  204  is affixed to the turn-shaft gear  214 . This is done in such a way that rotation of the turn shaft  204 , in use, urges rotation of the turn-shaft gear  214 . 
     The dial shaft  208  is configured to be selectively rotatable. The rotation axis  216  extends through the dial shaft  208 . The dial shaft  208  is affixed to the dial  206 . This is done in such a way that once the dial  206  is made to be selectively rotated by the user, the dial shaft  208  is accordingly selectively rotated (this is done in such a way that the selective rotation of the dial  206 , in use, urges the selective rotation of the dial shaft  208 ). 
     The turn shaft  204  and the dial shaft  208  are configured to rotate (clockwise and/or counter clockwise) along the rotation axis  216 . The turn shaft  204  and the dial shaft  208  are coaxially aligned (one within the other). Preferably, the dial shaft  208  provides (defines) an elongated hole extending along the rotation axis  216 , and the dial shaft  208  is configured to receive the turn shaft  204 . Preferably, the turn shaft  204  and the dial shaft  208  are coaxially aligned (with the turn shaft  204  received or positioned within the dial shaft  208 ). The turn shaft  204  and the dial shaft  208  are configured to be rotatably supported by the mortise cylinder  901 . The turn shaft  204  and the dial shaft  208  are configured to be rotatable (independently rotatable of each other) once the turn shaft  204  and the dial shaft  208  are rotatably supported by the mortise cylinder  901 . 
     The gear  220  is rotatably mounted to the mortise cylinder  901 . The gear shaft  218  is rotatably coupled to the gear  220 . The turn-shaft gear  214  is rotatably coupled to the gear  220 . This is done in such a way that rotation of the turn-shaft gear  214 , in use, urges rotation of the gear  220  and the gear shaft  218  (rotation of the gear  220 , in use, urges the rotation of the gear shaft  218 ). The gear shaft  218  is configured to be rotatably coupled to the selectively-movable lock member  902 . This is done in such a way that rotation of the gear shaft  218 , in use, urges rotation of the selectively-movable lock member  902 . Selective rotation of the dial shaft  208 , in use, urges the rotation of the selectively-movable lock member  902 . 
     The selectively-movable lock member  902  is rotatably supported by (rotatably mounted to) the mortise cylinder  901 . Preferably, the selectively-movable lock member  902  is rotatably mounted to an exterior (to the rear section) of the mortise cylinder  901 . 
     Selective rotation of the turn shaft  204 , in use, urges rotation of the selectively-movable lock member  902  between (A) the closed condition (as depicted in the embodiment of  FIG. 2  for the case where the lock assembly  100  is locked), and (B) the open condition (as depicted in the embodiment of  FIG. 3  for the case where the lock assembly  100  is unlocked). 
     For the case where the lock assembly  100  is locked (is placed in a locked condition), the lock assembly  100 , in use, prevents the selective rotation of the turn shaft  204 , and therefore prevents the selective rotation of the selectively-movable lock member  902  between the open condition (as depicted in the embodiment of  FIG. 3 ) and the closed condition (as depicted in the embodiment of  FIG. 2 ). 
     The first tumbler disk  226  is affixed to the dial shaft  208  (this is done is such a way that rotation of the dial shaft  208 , in use, urges the selective rotation of the first tumbler disk  226 ). 
     The second tumbler disk  228  and the third tumbler disk  230  are rotatably mounted to the dial shaft  208  (this is done in such a way that the second tumbler disk  228  and the third tumbler disk  230  are freely rotatable on the dial shaft  208 ). 
     The tumbler retainer  232  is affixed to an exterior portion of the dial shaft  208 . The tumbler retainer  232  is configured to retain the position of the second tumbler disk  228  and the third tumbler disk  230  between the tumbler retainer  232  and the first tumbler disk  226  (once the tumbler retainer  232  is affixed to an exterior portion of the dial shaft  208 ). 
     Selective rotation of the dial shaft  208 , in use, urges selective rotation of the first tumbler disk  226 . The first tumbler disk  226  is configured to selectively interface with (selectively contact) the second tumbler disk  228 . The first tumbler disk  226  is configured to selectively move the second tumbler disk  228  once the first tumbler disk  226 , in use, selectively contacts the second tumbler disk  228 , and once the first tumbler disk  226  is selectively rotated by the dial shaft  208 . 
     The second tumbler disk  228  is configured to selectively interface with (selectively contact) the third tumbler disk  230 . The second tumbler disk  228  is configured to selectively move the third tumbler disk  230  once the second tumbler disk  228 , in use, selectively contacts the third tumbler disk  230 , and once the second tumbler disk  228  is selectively rotated by the first tumbler disk  226 . 
     The slide device  224  is configured to selectively latch with the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  between (A) a locked condition (a latched condition, as depicted in the embodiment of  FIG. 37 ), and (B) an unlocked condition (an unlatched condition, as depicted in the embodiment of  FIG. 35 ). Preferably, the slide device  224  provides (defines) the slide channel  225  that is configured to selectively latch with an aspect of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  (as is described in further details below). 
     In the unlocked condition (as depicted in the embodiment of  FIG. 35 ), the slide device  224 , in use, prevents rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . 
     In the locked condition (as depicted in the embodiment of  FIG. 37 ), the slide device  224 , in use, permits the rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . 
     The slide spring  222  is configured to bias the movement of the slide device  224  from the locked condition (depicted in the embodiment of  FIG. 37 ) toward the unlocked condition (depicted in the embodiment of  FIG. 35 ). 
     The turn shaft  204  is configured to selectively move the slide device  224  from the unlocked condition (depicted in the embodiment of  FIG. 35 ) toward the locked condition (depicted in the embodiment of  FIG. 37 ). 
       FIG. 8  and  FIG. 9  depict a cross-sectional side view ( FIG. 8 , which is taken along a cross-sectional line A-A of  FIG. 6 ) and a cross-sectional front view ( FIG. 9 , which is taken along a cross-sectional line B-B of  FIG. 8 ) of embodiments of the lock assembly  100  of  FIG. 6 . 
     Referring to the embodiment as depicted in  FIG. 8 , the slide body  238  is positioned along a lower section of the mortise-cylinder housing  900  approximately midway between the front portion and the rear portion of the mortise-cylinder housing  900 . The slide body  238  is configured to support the location (position) of the slide device  224  (which is depicted in  FIG. 7 ). Once the slide device  224  is placed in the locked condition (as depicted in  FIG. 37 ), the turn shaft  204  is not rotatable (and the turn shaft  204  cannot be utilized in order to move the selectively-movable lock member  902 , and the selectively-movable lock member  902  remains in a locked condition or position). Once the slide device  224  is placed in the unlocked condition (as depicted in  FIG. 35 ), the turn shaft  204  is rotatable (and the turn shaft  204  is utilized or moved in order to move the selectively-movable lock member  902 ). 
     In accordance with the embodiment as depicted in  FIG. 9 , the slide device  224  provides (defines) the slide channel  236 . The slide device  224  is configured to be selectively received in (and preferably in contact with) the slide channel  236  of the slide device  224  (as depicted in  FIG. 7 ). 
     In accordance with the embodiment as depicted in  FIG. 8  and  FIG. 9 , the front plate  212  defines a first hole  402  configured to receive the dial shaft  208  (as depicted in  FIG. 7 ). 
       FIG. 10  and  FIG. 11  depict a cross-sectional bottom view ( FIG. 10 , which is taken along a cross-sectional line C-C of  FIG. 8 ) and a perspective view ( FIG. 11 ) of embodiments of the lock assembly  100  of  FIG. 6 . 
     In accordance with the embodiment as depicted in  FIG. 10 , the slide channel  236  is positioned (located) in a midsection of the slide body  238 . Preferably, the slide body  238  spans between the lower opposite sides of the mortise-cylinder housing  900 . The slide body  238  is positioned approximately midway between the front plate  212  and the rear section of the mortise-cylinder housing  900 . 
     In accordance with the embodiment as depicted in  FIG. 11 , the slide body  238  forms a crescent-shaped body having a curved lower section that conforms to the inner curved shape of the mortise-cylinder housing  900 . 
       FIG. 12 ,  FIG. 13  and  FIG. 14  depict a side view ( FIG. 12 ), a front view ( FIG. 13 ) and a side view ( FIG. 14 ) of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiments as depicted in  FIG. 12  and  FIG. 13 , the back plate  234  is substantially flat. The back plate  234  defines (provides) the second hole  404  and the third hole  406 . The second hole  404  is positioned in the central zone of the back plate  234 . The third hole  406  is positioned between the second hole  404  and the outer edge of the back plate  234 . The third hole  406  is configured to receive the gear shaft  218  (as depicted in  FIG. 7 ). The second hole  404  is configured to receive the dial shaft  208 , with the turn shaft  204  positioned in the center of the dial shaft  208  (as depicted in  FIG. 7 ). 
     In accordance with the embodiments as depicted in  FIG. 14 , the turn handle  202  is affixed to a distal end portion of the turn shaft  204 . The turn-shaft gear  214  is positioned on the opposite end of the turn shaft  204  (opposite from the placement of the turn handle  202  to the turn shaft  204 ). 
     The turn shaft  204  provides (defines) a shaft groove  209  configured to selectively interact with (selectively contact) the slide device  224  (as depicted in  FIG. 7 ). The shaft groove  209  is configured to selectively interact with the slide device  224  (as described in connection with the description of  FIG. 31  and  FIG. 32 ). 
       FIG. 15  and  FIG. 16  depict a side view ( FIG. 15 ) and a front view ( FIG. 16 ) of embodiments of the lock assembly  100  of  FIG. 6 . 
     In accordance with the embodiment as depicted in  FIG. 15 , the turn-shaft gear  214  has been removed from the opposite end of the turn shaft  204  to better show the shaft groove  209  formed on the outer surface of the turn shaft  204 . 
     In accordance with the embodiment as depicted in  FIG. 16 , the turn handle  202  forms an elongated body that is relatively flatter shaped than the diameter of the turn shaft  204  and the diameter of the turn-shaft gear  214 . 
       FIG. 17  and  FIG. 18  depict a side view ( FIG. 17 ) and a front view ( FIG. 18 ) of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiment as depicted in  FIG. 17 , the first tumbler disk  226  is affixed to an outer portion of the dial shaft  208  (between the opposite end sections of the dial shaft  208 ). The first extension member  408  extends from the first tumbler disk  226 , and also extends away from the dial  206  once the dial  206  is mounted to the end portion of the dial shaft  208 . The fourth hole  410  (provided by or defined by the dial shaft  208 ) extends between the opposite end sections of the dial shaft  208 . The fourth hole  410  is configured to receive the turn shaft  204  (as depicted in  FIG. 7 ). The dial  206  defines (provides) the fifth hole  412  that extends into the dial  206 . The fifth hole  412  is configured to receive, at least in part, the end portion of the dial shaft  208 . 
     In accordance with the embodiment as depicted in  FIG. 18 , the first extension member  408  extends (along an axial direction) from one side of the first tumbler disk  226 . The first extension member  408  is configured to selectively contact the second contact member associated with the second tumbler disk  228  (as depicted in  FIG. 19 ). 
     The first tumbler disk  226  defines (provides) the first central hole  418 , and the first central hole  418  is configured to receive the dial shaft  208  (as depicted in  FIG. 17 ). The first tumbler disk  226  defines (provides) the first lock hole  414 , and the first lock hole  414  is configured to selectively interact with (selectively latch and unlatch with) the slide device  224  (as depicted in  FIG. 29  and  FIG. 30 ). A radial line extends through the first lock hole  414  along a radial direction from the center of the first tumbler disk  226 . Another radial line extends through the first extension member  408  along another radial direction from the center of the first tumbler disk  226 . A first angle  416  extends between the radial lines that extend through the first extension member  408  and the first lock hole  414 . 
       FIG. 19 ,  FIG. 20A ,  FIG. 21B  and  FIG. 21  depict front views of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiment as depicted in  FIG. 19 , the second tumbler disk  228  provides (defines) the second lock hole  420 , and the second lock hole  420  is configured to selectively interact with the slide device  224  (in a similar manner as the first lock hole  414  of the first tumbler disk  226 ). The second tumbler disk  228  also defines (provides) the second central hole  422 , and the second central hole  422  is configured to receive the dial shaft  208  (as depicted in  FIG. 7  and  FIG. 22 ). The second extension member  424  extends from each of the opposite sides of the second tumbler disk  228  (as depicted in  FIG. 22 ). 
     A radial line extends through the second lock hole  420  along a radial direction from the center of the second tumbler disk  228 . Another radial line extends through the second extension member  424  along another radial direction from the center of the second tumbler disk  228 . A second angle  426  extends between the radial lines that extend through the second lock hole  420  and the second extension member  424 . 
     In accordance with the embodiment as depicted in  FIG. 20A , the third tumbler disk  230  provides (defines) the third lock hole  428 . The third tumbler disk  230  also defines (provides) the third central hole  430  for receiving the dial shaft  208  (as depicted in  FIG. 7  and  FIG. 22 ). The third tumbler disk  230  includes the third extension member  432  that extends from one side of the third tumbler disk  230 . The third extension member  432  is configured to selectively contact the second extension member  424  of the second tumbler disk  228 . 
     In accordance with the embodiment as depicted in  FIG. 20B , the first extension member  408  of the first tumbler disk  226  is configured to selectively contact (and move) the second extension member  424  of the second tumbler disk  228  (once the first tumbler disk  226  is selective rotated by the dial shaft  208 ). The second extension member  424  of the second tumbler disk  228  is configured to selectively contact (and move) the third extension member  432  of the third tumbler disk  230 , which then rotates the  230  (once the second tumbler disk  228  is selectively rotated accordingly). Therefore, once the first extension member  408 , in use, is made to contact (and move) the second extension member  424  (once the  226  is made to rotate by the rotation of the dial shaft  208 ), the dial shaft  208  can then be further rotated in such a way that the second extension member  424 , in use, contacts (and moves) the third extension member  432  (which then urges rotation of the third tumbler disk  230 ). 
     A radial line extends through the third lock hole  428  along a radial direction from the center of the third tumbler disk  230 . Another radial line extends through the third extension member  432  along another radial direction from the center of the third tumbler disk  230 . A third angle  434  extends between the radial lines that extend through the third lock hole  428  and the third extension member  432 . 
     In accordance with the embodiment as depicted in  FIG. 21 , the tumbler retainer  232  provides (defines) the retainer hole  436  configured to receive the dial shaft  208 . The tumbler retainer  232  is configured to be affixed to an outer section (surface) of the dial shaft  208  (as depicted in  FIG. 7 ). 
       FIG. 22  depicts a side view of an embodiment of the lock assembly  100  of  FIG. 6 . 
     In accordance with the embodiment as depicted in  FIG. 22 , the turn-shaft gear  214  defines the gear hole  438 , in which the gear hole  438  is configured to receive (at least in part) the turn shaft  204 . The turn-shaft gear  214  is configured to be affixed to an end portion of the dial shaft  208 . 
     The tumbler retainer  232  provides (defines) the retainer hole  436 , in which the retainer hole  436  is configured to receive the dial shaft  208 . The tumbler retainer  232  is configured to be affixed to the dial shaft  208  in such a way that the tumbler retainer  232 , in use, retains the position (location) of the third tumbler disk  230  and the second tumbler disk  228  on the dial shaft  208 , and the third tumbler disk  230  and the second tumbler disk  228  are located between the second tumbler disk  228  and the tumbler retainer  232 . 
     The third tumbler disk  230  defines the third central hole  430 , in which the third central hole  430  is configured to receive the dial shaft  208 . The third tumbler disk  230  includes the third extension member  432  extending from one side of the third tumbler disk  230 . The third extension member  432  (of the third tumbler disk  230 ), in use, faces the second extension member  424  (of the second tumbler disk  228 ). The third extension member  432  is configured to selectively contact the second extension member  424  (once the second extension member  424  is made to be rotated). 
     The second tumbler disk  228  defines the second central hole  422 , in which the second central hole  422  is configured to receive the dial shaft  208 . The second extension member  424  extends from the opposite lateral sides of the second tumbler disk  228 . The second extension member  424 , in use, faces the first extension member  408  (of the first tumbler disk  226 ). The second extension member  424  is configured to selectively contact the first extension member  408  (in response to the rotation of the first extension member  408  by the dial shaft  208 ). 
     The second extension member  424 , in use, also faces the third extension member  432  (of the third tumbler disk  230 ). The second extension member  424  is also configured to selectively contact the third extension member  432  (in response to the rotation of the first extension member  408  by the dial shaft  208 , and in response to the rotation of the second tumbler disk  228  by the rotation of the first tumbler disk  226 ). 
     The dial shaft  208  is received by the fifth hole  412  of the dial  206 . The turn shaft  204  is received in the fourth hole  410  of the dial shaft  208 . As well, the turn shaft  204  is received in the fifth hole  412  of the dial  206 . 
       FIG. 23 ,  FIG. 24 ,  FIG. 25  and  FIG. 26  depict a side view ( FIG. 23 ), a top view ( FIG. 24 ), an end view ( FIG. 25 ) and a cross-sectional view ( FIG. 26 , which is taken along a cross-sectional line D-D of  FIG. 23 ) of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiment as depicted in  FIG. 23 ,  FIG. 24 ,  FIG. 25  and  FIG. 26 , the slide device  224  includes a crown  227 . The slide device  224  defines (provides) the first channel  225 A. The slide device  224  also defines (provides) the second channel  225 B. The first channel  225 A and the second channel  225 B are positioned on opposite sides of the crown  227 . 
     The slide device  224  defines the slide hole  442 , in which the slide hole  442  is configured to receive (at least in part) the turn shaft  204  (as depicted in  FIG. 7 ). The slide hole  442  is configured to interact with (cam with) the turn shaft  204  (as depicted in  FIG. 31  and  FIG. 32 ). 
       FIG. 27  to  FIG. 30  depict side views of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiment as depicted in  FIG. 27 , the first lock hole  414  (of the first tumbler disk  226 ), the second lock hole  420  (of the second tumbler disk  228 ) and the third lock hole  428  (of the third tumbler disk  230 ) are not rotatably aligned to face a common radial direction (in sharp contrast with the embodiments of  FIG. 29  and  FIG. 30  in which the first lock hole  414 , the second lock hole  420  and the third lock hole  428  are aligned to face a common radial direction). For this case (as depicted in  FIG. 27 ), the slide device  224 , in use, contacts any one of the outer peripheral edges of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  so that the slide device  224 , in use, is prevented from being moved (that is, the slide device  224  remains stationary as depicted in  FIG. 37 , in which the selectively-movable lock member  902  is prevented from being rotated or moved). 
     The dial shaft  208  is configured to be rotated, so that the first extension member  408  of the second tumbler disk  228  is then rotated (since the second tumbler disk  228  is affixed to the dial shaft  208 ). Continued rotation of the first extension member  408  eventually results in selective contact of the first extension member  408  with the second extension member  424  (of the second tumbler disk  228 ), and the second extension member  424  with the third extension member  432  (of the third tumbler disk  230 ). The dial shaft  208  is selectively rotated, accordingly until the first lock hole  414 , the second lock hole  420  and the third lock hole  428  are co-aligned to face a common radial direction as depicted in  FIG. 29  and  FIG. 30 . 
     It will be appreciated that while the first lock hole  414  (of the first tumbler disk  226 ), the second lock hole  420  (of the second tumbler disk  228 ) and the third lock hole  428  (of the third tumbler disk  230 ) are not rotatably aligned to face a common radial direction, the selectively-movable lock member  902  is not permitted to be rotated (as depicted in  FIG. 37 ). 
     In accordance with the embodiment as depicted in  FIG. 28 , the first lock hole  414  faces the crown  227  of the slide device  224 , while the second lock hole  420  and the third lock hole  428  are positioned to not face the crown  227  of the slide device  224 . It will be appreciated that further continued rotation of the dial shaft  208  is required to selectively rotate the second lock hole  420  and the third lock hole  428  into co-alignment and to face a common radial direction as depicted in  FIG. 29  and  FIG. 30 . 
     It will be appreciated that for  FIG. 28 , the slide device  224 , in use, is prevented from being moved (the slide device  224  remains stationary as depicted in  FIG. 37 , in which the selectively-movable lock member  902  is prevented from being rotated or moved). 
     In accordance with the embodiment as depicted in  FIG. 29 , the first lock hole  414 , the second lock hole  420  and the third lock hole  428  are rotated and aligned (in unison) to face a common radial direction toward the crown  227  of the slide device  224 . For this case, the slide spring  222 , in use, moves (urges) the slide device  224  into (at least in part) each of the first lock hole  414 , the second lock hole  420  and the third lock hole  428 , and the selectively-movable lock member  902  is permitted to be rotated (as depicted in  FIG. 35 ). 
     The turn shaft  204  becomes rotatable once the slide device  224 , in use, is moved into (at least in part) each of the first lock hole  414 , the second lock hole  420  and the third lock hole  428 . 
     The dial shaft  208  is prevented from being rotatable once the slide device  224 , in use, is moved into (at least in part) each of the first lock hole  414 , the second lock hole  420  and the third lock hole  428 . 
     In accordance with the embodiment as depicted in  FIG. 30 , the slide device  224 , in use, is moved in such a way that the selectively-movable lock member  902  is permitted to be rotated or moved, as depicted in  FIG. 35 . 
       FIG. 31  to  FIG. 34  depict side views of embodiments of the lock assembly  100  of  FIG. 7 . 
     In accordance with the embodiment as depicted in  FIG. 31 , the slide device  224  defines the slide hole  442 , in which the slide hole  442  is configured to receive (at least in part) the turn shaft  204 . The slide hole  442  is configured to interact with (cam with) the turn shaft  204 . 
     The shaft groove  209  (of the turn shaft  204 ) is configured to selectively interact with the slide device  224 . Preferably, the shaft groove  209  (of the turn shaft  204 ) is configured to selectively cam with the slide device  224 . 
     Once the first lock hole  414 , the second lock hole  420  and the third lock hole  428  are rotated and aligned (in unison) to face a common radial direction toward the crown  227  of the slide device  224  (as depicted in  FIG. 30 ), the shaft groove  209 , in use, faces a lower surface of the slide hole  442  of the slide device  224 . The slide spring  222  urges the slide device  224  upwardly toward the top section of the mortise-cylinder housing  900 . 
     The turn shaft  204  is configured to be rotatable in such a way that the cam surface associated with the shaft groove  209  contacts the lower cam surface associated with the slide hole  442 . 
     In accordance with the embodiment as depicted in  FIG. 32 , continued rotation of the turn shaft  204  results in a camming action between the turn shaft  204  (the cam surface associated with the shaft groove  209 ) and the camming surface associated with the slide hole  442  (of the slide device  224 ). Continued rotation of the turn shaft  204  urges the slide device  224  to move downwardly (as depicted in  FIG. 33 ). 
     In accordance with the embodiment as depicted in  FIG. 33 , rotation of the turn shaft  204  resulted in the movement of the slide device  224  out from the first lock hole  414 , the second lock hole  420  and the third lock hole  428  (which face a common radial direction toward the crown  227  of the slide device  224 ). For this case, the dial shaft  208  is free to be rotated. 
     In accordance with the embodiment as depicted in  FIG. 34 , continued rotation of the dial shaft  208  results in the misalignment of the first lock hole  414 , the second lock hole  420  and the third lock hole  428 . The slide device  224 , in use, contacts the outer peripheral edges of the dial shaft  208 , the second tumbler disk  228  and the third tumbler disk  230 . 
       FIG. 35  depicts a cross-sectional view (taken along a cross-sectional line A-A of  FIG. 6 ) of an embodiment of the lock assembly  100  of  FIG. 6  (in which the lock assembly  100  is positioned in an unlocked condition). 
     In accordance with the embodiment as depicted in  FIG. 35 , once the slide device  224  is placed in (moved to) the unlocked condition (as depicted in  FIG. 35 ), the slide device  224  is engaged (latched) with the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  (in such a way that the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  are not rotatable in the unlocked condition). The unlocked condition refers to the free movement of the selectively-movable lock member  902 . 
     The slide device  224  is configured to selectively latch with the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  between (A) a locked condition (a latched condition, as depicted in the embodiment of  FIG. 37 ), and (B) an unlocked condition (an unlatched condition, as depicted in the embodiment of  FIG. 35 ). 
     In the unlocked condition (as depicted in the embodiment of  FIG. 35 ), the slide device  224 , in use, prevents rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . In the locked condition (as depicted in the embodiment of  FIG. 37 ), the slide device  224 , in use, permits the rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . 
     The slide spring  222  is configured to bias the movement of the slide device  224  from the locked condition (depicted in the embodiment of  FIG. 37 ) toward the unlocked condition (depicted in the embodiment of  FIG. 35 ). 
     The turn shaft  204  is configured to selectively move the slide device  224  from the unlocked condition (depicted in the embodiment of  FIG. 35 ) toward the locked condition (depicted in the embodiment of  FIG. 37 ). 
       FIG. 36  depicts an end view of an embodiment of the lock assembly  100  of  FIG. 35 . 
     In accordance with the embodiment as depicted in  FIG. 36 , the selectively-movable lock member  902  is placed in the unlatched condition (that is, the selectively-movable lock member  902  is free to be moved, which is also depicted in  FIG. 3 ). 
       FIG. 37  depicts a cross-sectional view (taken along a cross-sectional line A-A of  FIG. 6 ) of an embodiment of the lock assembly  100  of  FIG. 6  (in which the lock assembly  100  is positioned in a locked condition). 
     In accordance with the embodiment as depicted in  FIG. 37 , once the slide device  224  is placed in (moved to) the locked condition (as depicted in  FIG. 37 ), the slide device  224  is not engaged (not latched) with the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  (in such a way that the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  are free to be rotatable. The locked condition refers to the non-rotatable condition of the selectively-movable lock member  902 . 
     The slide device  224  is configured to selectively latch with the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230  between (A) a locked condition (a latched condition, as depicted in the embodiment of  FIG. 37 ), and (B) an unlocked condition (an unlatched condition, as depicted in the embodiment of  FIG. 35 ). 
     In the unlocked condition (as depicted in the embodiment of  FIG. 35 ), the slide device  224 , in use, prevents rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . 
     In the locked condition (as depicted in the embodiment of  FIG. 37 ), the slide device  224 , in use, permits the rotation of the first tumbler disk  226 , the second tumbler disk  228  and the third tumbler disk  230 . 
     The slide spring  222  is configured to bias the movement of the slide device  224  from the locked condition (depicted in the embodiment of  FIG. 37 ) toward the unlocked condition (depicted in the embodiment of  FIG. 35 ). 
     The turn shaft  204  is configured to selectively move the slide device  224  from the unlocked condition (depicted in the embodiment of  FIG. 35 ) toward the locked condition (depicted in the embodiment of  FIG. 37 ). 
       FIG. 38  depicts an end view of an embodiment of the lock assembly  100  of  FIG. 37 . 
     In accordance with the embodiment as depicted in  FIG. 37 , the selectively-movable lock member  902  is placed in the latched condition (that is, the selectively-movable lock member  902  is not free to be moved, which is also depicted in  FIG. 2 ). 
       FIG. 39  and  FIG. 40  depict an end view ( FIG. 39 ) and a side view ( FIG. 40 ) of embodiments of the lock assembly  100  of  FIG. 7 . 
       FIG. 2 ,  FIG. 3  and  FIG. 41  to  FIG. 65  depict views in accordance with aspects of a second embodiment of a lock assembly  100  ( FIG. 2  and  FIG. 3  are both applicable to the first and second embodiments). 
       FIG. 41  depicts a perspective view of the second embodiment of a lock assembly  100 . 
       FIG. 42  and  FIG. 43  depict side views of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiments as depicted in  FIG. 41 ,  FIG. 42  and  FIG. 43 , the lock assembly  100  is configured to be selectively connectable to the mortise-cylinder housing  900  (and removable from), without the need to replace the mortise-cylinder housing  900  (and/or the internal mechanisms of the mortise-cylinder housing  900 ). The mortise-cylinder housing  900  is configured to be operated with a key  350  (as depicted in the embodiments of  FIG. 42  and  FIG. 43 ). The key  350  is inserted into the mortise-cylinder housing  900 . The lock assembly  100  is configured to be coupled to the key  350 . The lock assembly  100  is further configured to selectively (securely) move the key  350  in such a way that the lock assembly  100 , in use, selectively locks and unlocks the mortise-cylinder housing  900  (via selective movement of the key  350  by the operation of the lock assembly  100 ). 
     In accordance with the embodiments as depicted in  FIG. 42 , the mortise-cylinder housing  900  includes a flange assembly  918  (a collar) configured to surround the front plate  212  of the mortise-cylinder housing  900 . The flange assembly  918  is positioned between the front plate  212  and the movable door  912 . 
     In accordance with the embodiments as depicted in  FIG. 43 , the flange assembly  918  is removed from between the front plate  212  and the movable door  912 , thereby revealing a gap  922 . The gap  922  is configured (dimensioned) to receive (at least in part) a portion of the lock assembly  100  (in order to permit the lock assembly  100  to be securely coupled to the housing of the mortise-cylinder housing  900 ). 
       FIG. 44  and  FIG. 45  depict a perspective view ( FIG. 44 ) and a side view ( FIG. 45 ) of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 44  and  FIG. 45 , the mortise-cylinder housing  900  is configured to operatively receive the key  350 . Rotation of the key  350 , in use, urges movement (rotation) of the selectively-movable lock member  902  of the mortise-cylinder housing  900 . The lock assembly  100  is configured to operatively selectively and securely rotate (move) the key  350  while the key  350  is received in the keyway  903  (keyhole) of the mortise-cylinder housing  900 . This is done in such a way that operation of the lock assembly  100 , in use, operatively selectively and securely rotates (moves) the key  350  while the key  350  is received in the keyway  903  (keyhole) of the mortise-cylinder housing  900 . 
     In accordance with the embodiment as depicted in  FIG. 45 , the lock assembly  100  includes a main housing  302  and a holder  320 . The main housing  302  and a holder  320  are configured to be selectively securely coupled together (as depicted in  FIG. 47 ). 
     The main housing  302  and the holder  320  are configured to be received (at least in part) in the gap  922  (formed between the front plate  212  of the mortise-cylinder housing  900  and the stationary wall  914 ). 
     Once the main housing  302  and the holder  320  are received (at least in part) in the gap  922 , the main housing  302  and the holder  320 , in use, are selectively securely coupled together (as depicted in  FIG. 48 ). 
     In accordance with the embodiment as depicted in  FIG. 45 , the lock assembly  100  further includes the main housing  302 , the removable housing  304 , a turn handle  306  (similar to the turn handle  202  of  FIG. 4 ), a first numbered dial  308 , a second numbered dial  310 , a third numbered dial  312 , and a fourth numbered dial  314 , the holder  320 , a first gear  322 , a second gear  324 , a third gear  326 , a fourth gear  328 , a dial shaft  330 , a first tumbler disc  332 , a second tumbler disc  334 , a third tumbler disc  336 , a fourth tumbler disc  338 , a first tumbler disc gear  340 , a second tumbler disc gear  342 , a third tumbler disc gear  344 , a fourth tumbler disc gear  346 , a tumbler disc shaft  348 , a turnkey adapter  352 , and a turn shaft  354 . 
     The dial shaft  330  is configured to be rotatably mounted to the main housing  302 . The dial shaft  330  extends between the front section and the rear section of the main housing  302  (once the dial shaft  330  is rotatably mounted to the main housing  302 ). 
     The first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314  are rotatably mounted to the dial shaft  330 . The first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314  are spaced apart from each other (once the first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314  are rotatably mounted to the dial shaft  330 ). 
     The first gear  322 , the second gear  324 , the third gear  326  and the fourth gear  328  are rotatably mounted to the dial shaft  330 . The first gear  322 , the second gear  324 , the third gear  326  and the fourth gear  328  are spaced apart from each other (once the first gear  322 , the second gear  324 , the third gear  326  and the fourth gear  328  are rotatably mounted to the dial shaft  330 ). 
     The first numbered dial  308  and the first gear  322  are affixed to each other (so that the first numbered dial  308  and the first gear  322  are rotatable in unison with each other). The second numbered dial  310  and the second gear  324  are affixed to each other (so that the second numbered dial  310  and the second gear  324  are rotatable in unison with each other). The third numbered dial  312  and the third gear  326  are affixed to each other (so that the third numbered dial  312  and the third gear  326  are rotatable in unison with each other). The fourth numbered dial  314  and the fourth gear  328  are affixed to each other (so that the fourth numbered dial  314  and the fourth gear  328  are rotatable in unison with each other). 
     The tumbler disc shaft  348  is configured to be rotatably mounted to the main housing  302 . The tumbler disc shaft  348  extends between the front section and the rear section of the main housing  302  (once the tumbler disc shaft  348  is rotatably mounted to the main housing  302 ). The tumbler disc shaft  348  is positioned below the dial shaft  330  in a spaced-apart relationship. 
     The first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  are rotatably mounted to the tumbler disc shaft  348 . The first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  are spaced apart from each other (once the first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  are rotatably mounted to the tumbler disc shaft  348 ). 
     The first tumbler disc gear  340 , the second tumbler disc gear  342 , the third tumbler disc gear  344  and the fourth tumbler disc gear  346  are rotatably mounted to the tumbler disc shaft  348 . The first tumbler disc gear  340 , the second tumbler disc gear  342 , the third tumbler disc gear  344  and the fourth tumbler disc gear  346  are spaced apart from each other (once the first tumbler disc gear  340 , the second tumbler disc gear  342 , the third tumbler disc gear  344  and the fourth tumbler disc gear  346  are rotatably mounted to the tumbler disc shaft  348 ). 
     The first tumbler disc gear  340  and the first tumbler disc  332  are affixed to each other (so that the first tumbler disc gear  340  and the first tumbler disc  332  are rotatable in unison with each other). The second tumbler disc gear  342  and the second tumbler disc  334  are affixed to each other (so that the second tumbler disc gear  342  and the second tumbler disc  334  are rotatable in unison with each other). The third tumbler disc gear  344  and the third tumbler disc  336  are affixed to each other (so that the third tumbler disc gear  344  and the third tumbler disc  336  are rotatable in unison with each other). The fourth tumbler disc gear  346  and the fourth tumbler disc  338  are affixed to each other (so that the third tumbler disc gear  344  and the fourth tumbler disc  338  are rotatable in unison with each other). 
     The first gear  322  and the first tumbler disc gear  340  are configured to interface (mate) with each other (such that rotation of the first gear  322 , in use, urges rotation of the first tumbler disc gear  340 ). The second gear  324  and the second tumbler disc gear  342  are configured to interface (mate) with each other (such that rotation of the second gear  324 , in use, urges rotation of the second tumbler disc gear  342 ). The third gear  326  and the third tumbler disc gear  344  are configured to interface (mate) with each other (such that rotation of the third gear  326 , in use, urges rotation of the third tumbler disc gear  344 ). The fourth gear  328  and the fourth tumbler disc gear  346  are configured to interface (mate) with each other (such that rotation of the fourth gear  328 , in use, urges rotation of the fourth tumbler disc gear  346 ). 
     The turn shaft  354  is configured to be rotatably mounted to the main housing  302 . The turn shaft  354  extends between the front section and the rear section of the main housing  302  (once the turn shaft  354  is rotatably mounted to the main housing  302 ). The turn shaft  354  provides features (such as grooves) configured to selectively interact (interface) with the first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  between a locked condition (as depicted in  FIG. 62 , in which the selectively-movable lock member  902  is not movable or not rotatable) and an unlocked condition (as depicted in  FIG. 64 , in which the selectively-movable lock member  902  is movable or rotatable). 
     The turnkey adapter  352  is configured to be affixed to an end portion of the turn shaft  354 , and the turnkey adapter  352  is configured to be selectively coupled to the key  350  (once the lock assembly  100  is mounted to the mortise-cylinder housing  900 ). 
     In the locked condition (as depicted in  FIG. 62 ), the turn shaft  354 , in use, cannot be utilized to rotate the turnkey adapter  352  (so that the key  350  cannot be utilized to rotate the selectively-movable lock member  902 ). It will be appreciated that for the case where the first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314  are not positioned or moved into a predetermined position and/or sequence, the turn shaft  354  may not be utilized to selectively move the selectively-movable lock member  902 . 
     In the unlocked condition (as depicted in  FIG. 64 ), the turn shaft  354 , in use, can be utilized to rotate the turnkey adapter  352  (so that the key  350  can be utilized to rotate the selectively-movable lock member  902 ). It will be appreciated that for the case where the first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314  are positioned or moved into a predetermined position and/or sequence, the turn shaft  354  may be utilized to selectively move the selectively-movable lock member  902 . 
     The lock assembly  100  is configured to selectively release the movement of the selectively-movable lock member  902  of the mortise-cylinder housing  900  for the case where a set of dials (such as, the first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312  and the fourth numbered dial  314 ) selectively show a specific sequence of symbols (a predetermined sequence of symbols). The lock assembly  100  is configured to be opened by rotating one or more dials through a set of positions in a prescribed order and/or direction (a special sequence). The lock assembly  100  is a type of locking device in which a sequence of numbers or symbols is used to open the lock assembly  100 . The sequence may be entered using a single rotating dial that is configured to interact with a disc or a cam by using a set of rotating discs with inscribed numerals, which interact with the locking mechanism, or through an electronic or mechanical keypad. The lock assembly  100  is configured to be opened for the case where a set of dials (wheels) releases (or turns) the tumblers of a lock to show a specific sequence of numbers. 
       FIG. 46  and  FIG. 47  depict front views of embodiments of the lock assembly  100  of  FIG. 45 . 
     In accordance with the embodiment as depicted in  FIG. 46 , the holder  320  includes a curved (shaped) portion configured to conform (at least in part) with the outline (diameter) of the mortise-cylinder housing  900 . The holder  320  is placed above the gap  922  (depicted in  FIG. 45 ), and the holder  320  is moved (downwardly) toward the mortise-cylinder housing  900  and into the gap  922 . 
     The main housing  302  includes a curved (shaped) portion configured to conform (at least in part) with the outline (diameter) of the mortise-cylinder housing  900 . The main housing  302  is placed below the gap  922  (depicted in  FIG. 45 ), and the main housing  302  is moved (upwardly) toward the mortise-cylinder housing  900  and into the gap  922 . 
     In accordance with the embodiment as depicted in  FIG. 47 , the main housing  302  and the holder  320  are configured to be selectively (securely) snap fitted with each other once the holder  320  is moved (downwardly) toward the mortise-cylinder housing  900  and into the gap  922 , and once the main housing  302  is moved (upwardly) toward the mortise-cylinder housing  900  and into the gap  922 . 
       FIG. 48  depicts a side view of an embodiment the lock assembly  100  of  FIG. 41 . 
       FIG. 49  depicts a side view of an embodiment the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 48 , the lock assembly  100  further includes a removable housing  304  configured to be securely connectable (mated) to the main housing  302 . It will be appreciated that the holder  320  and the removable housing  304  may be an integrated unit (if so desired). 
     In accordance with the embodiment as depicted in  FIG. 49 , the lock assembly  100  is selectively installed to the mortise-cylinder housing  900 , with the removable housing  304  installed to the main housing  302  (so that the interior components of the lock assembly  100  are protected from unwanted tampering). 
       FIG. 50  and  FIG. 51  depict a front view ( FIG. 50 ) and a rear view ( FIG. 51 ) of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 50 , the turn handle  306  extends from a frontal section of the main housing  302 . 
     In accordance with the embodiment as depicted in  FIG. 51 , the mortise-cylinder housing  900  is depicted as being mounted to the rear section of the lock assembly  100 , with the selectively-movable lock member  902  extending from the rear of the mortise-cylinder housing  900 . 
       FIG. 52 ,  FIG. 53  and  FIG. 54  depict a front view ( FIG. 52 ), a rear view ( FIG. 53 ) and a perspective view ( FIG. 54 ) of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 52 ,  FIG. 53  and  FIG. 54 , the first gear  322  is positioned above the first tumbler disc gear  340 . The first tumbler disc  332  defines (provides) a first notch  333  formed on a peripheral edge of the first tumbler disc  332 . 
       FIG. 55  and  FIG. 56  depict perspective views of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 55 , the first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  each respectively defines a first notch  333 , a second notch  335 , a third notch  337  and a fourth notch  339 . 
     In accordance with the embodiment as depicted in  FIG. 56 , the turnkey adapter  352  defines a key notch  353  configured to receive (at least in part) the key  350  (as depicted in  FIG. 62 ). The turn shaft  354  defines (provides) a mating notch  355  configured to respectively interact with the notches provided by the first tumbler disc  332 , the second tumbler disc  334 , the third tumbler disc  336  and the fourth tumbler disc  338  (as depicted in  FIG. 55 ). 
       FIG. 57  to  FIG. 60  depict end views of embodiments of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 57 , the first notch  333 , the second notch  335 , the third notch  337  and the fourth tumbler disc  338  are positioned at different angular relationships relative to each other. For this case, the turn shaft  354  cannot be moved (rotated) until each of the first notch  333 , the second notch  335 , the third notch  337  and the fourth tumbler disc  338  are moved to become respectively aligned with and to face the mating notch  355  of the turn shaft  354 . 
     In accordance with the embodiment as depicted in  FIG. 58 , the first notch  333  has been moved to become aligned with the mating notch  355  of the turn shaft  354 . However, the second notch  335 , the third notch  337  and the fourth tumbler disc  338  are not yet positioned to respectively face (and align with) the turn shaft  354 . The turn shaft  354  cannot be moved (rotated) until each of the first notch  333 , the second notch  335 , the third notch  337  and the fourth tumbler disc  338  are moved to become respectively aligned with (and to face) the mating notch  355  of the turn shaft  354 . It will be appreciated that since the turn shaft  354  cannot be rotated, the turn shaft  354  cannot rotate the key  350 ; and, therefore, the turn the key  350  cannot be utilized to operate the mortise-cylinder housing  900  for the rotation of the selectively-movable lock member  902  (as depicted in  FIG. 62 ). 
     In accordance with the embodiment as depicted in  FIG. 59 , the first notch  333 , the second notch  335 , the third notch  337  and the fourth tumbler disc  338  are moved and positioned to respectively face (and become aligned with) the mating notch  355  of the turn shaft  354 . It will be appreciated that, for this case, the turn shaft  354  can be movable (rotatable), so that the mortise-cylinder housing  900  may be operated to rotate the selectively-movable lock member  902  (as depicted in  FIG. 64 ). 
     In accordance with the embodiment as depicted in  FIG. 60 , since the first notch  333 , the second notch  335 , the third notch  337  and the fourth tumbler disc  338  have been moved and positioned to respectively face (and become aligned with) the mating notch  355  of the turn shaft  354 , the turn shaft  354  has been moved (rotated). For this case, it will be appreciated that since the turn shaft  354  may be rotated, the turn shaft  354  can rotate the key  350 ; and, therefore, the key  350  can be utilized to operate the mortise-cylinder housing  900  for the rotation of the selectively-movable lock member  902  (as depicted in  FIG. 64 ). 
       FIG. 61  depicts a perspective view of an embodiment of the lock assembly  100  of  FIG. 41 . 
     In accordance with the embodiment as depicted in  FIG. 61 , the first numbered dial  308 , the second numbered dial  310 , the third numbered dial  312 , and the fourth numbered dial  314  are located on (and extend from) a top section of the removable housing  304 . 
       FIG. 62  depicts a cross-sectional view (taken along a cross-sectional line E-E of  FIG. 61 ) of an embodiment of the lock assembly  100  of  FIG. 61  (in which the lock assembly  100  is positioned in a locked condition). 
       FIG. 63  depicts a rear view of an embodiment of the lock assembly  100  of  FIG. 62 . 
       FIG. 64  depicts a cross-sectional view (taken along a cross-sectional line E-E of  FIG. 61 ) of an embodiment of the lock assembly  100  of  FIG. 61  (in which the lock assembly  100  is positioned in an unlocked condition). 
       FIG. 65  depicts a rear view of an embodiment of the lock assembly  100  of  FIG. 64 . 
     The following is offered as further description of the embodiments, in which any one or more of any technical feature (described in the detailed description, the summary and the claims) may be combinable with any other one or more of any technical feature (described in the detailed description, the summary and the claims). It is understood that each claim in the claims section is an open ended claim unless stated otherwise. Unless otherwise specified, relational terms used in these specifications should be construed to include certain tolerances that the person skilled in the art would recognize as providing equivalent functionality. By way of example, the term perpendicular is not necessarily limited to 90.0 degrees, and may include a variation thereof that the person skilled in the art would recognize as providing equivalent functionality for the purposes described for the relevant member or element. Terms such as “about” and “substantially”, in the context of configuration, relate generally to disposition, location, or configuration that are either exact or sufficiently close to the location, disposition, or configuration of the relevant element to preserve operability of the element within the invention which does not materially modify the invention. Similarly, unless specifically made clear from its context, numerical values should be construed to include certain tolerances that the person skilled in the art would recognize as having negligible importance as they do not materially change the operability of the invention. It will be appreciated that the description and/or drawings identify and describe embodiments of the apparatus (either explicitly or inherently). The apparatus may include any suitable combination and/or permutation of the technical features as identified in the detailed description, as may be required and/or desired to suit a particular technical purpose and/or technical function. It will be appreciated that, where possible and suitable, any one or more of the technical features of the apparatus may be combined with any other one or more of the technical features of the apparatus (in any combination and/or permutation). It will be appreciated that persons skilled in the art would know that the technical features of each embodiment may be deployed (where possible) in other embodiments even if not expressly stated as such above. It will be appreciated that persons skilled in the art would know that other options would be possible for the configuration of the components of the apparatus to adjust to manufacturing requirements and still remain within the scope as described in at least one or more of the claims. This written description provides embodiments, including the best mode, and also enables the person skilled in the art to make and use the embodiments. The patentable scope may be defined by the claims. The written description and/or drawings may help to understand the scope of the claims. It is believed that all the crucial aspects of the disclosed subject matter have been provided in this document. It is understood, for this document, that the word “includes” is equivalent to the word “comprising” in that both words are used to signify an open-ended listing of assemblies, components, parts, etc. The term “comprising”, which is synonymous with the terms “including,” “containing,” or “characterized by,” is inclusive or open-ended and does not exclude additional, unrecited elements or method steps. Comprising (comprised of) is an “open” phrase and allows coverage of technologies that employ additional, unrecited elements. When used in a claim, the word “comprising” is the transitory verb (transitional term) that separates the preamble of the claim from the technical features of the invention. The foregoing has outlined the non-limiting embodiments (examples). The description is made for particular non-limiting embodiments (examples). It is understood that the non-limiting embodiments are merely illustrative as examples.