Abstract:
A rim lock having a housing within which is disposed a solenoid with anvil and a plunger movable within the solenoid being reversible and interchangeable within the housing and using interchangeable bolt assemblies to provide for Fail Safe or Fail Secure or Mechanical applications. This invention also accommodates in a compact manner the use of the rim lock for both inswing and outswing door applications and from narrow to large stile door configurations.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a continuation-in-part of copending application Ser. No. 277,237 filed Nov. 29, 1988, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an electrically and or manually operable door lock. 
     More particularly, the present invention relates to a rim lock of the type used on the inside surface of a door or the like where individuals can be buzzed in and/or out by a shopkeeper or receptionist; and where mechanical actuation of the lock is also possible from inside the door or from where it may be desired. 
     2. Description of the Prior Art 
     A remotely actuated door lock can be strike-centered, that is, have its actuating mechanism in the strike on the doorjamb or in the lock on the door. 
     Such a strike-centered lock has the disadvantage of being fairly difficult to retrofit on the door with the bulky strike mechanism, and also such systems are normally easy to jimmy and otherwise circumvent. 
     There are many types of door-mounted locks. They may be incorporated in the doorknob assembly, as in U.S. Pat. No. 4,073,527 to Schlage. 
     In another such arrangement as disclosed in U.S. Pat. No. 2,763,888 to Billeter, a pneumatic door-mounted door closer is connected to a pneumatic actuator in a lock mechanism to withdraw the bolt momentarily as the door is just about closed, so that the door bolt does not noisily engage the strike. 
     In U.S. Pat. No. 3,234,766 to O&#39;Brian a small rotary output motor carries a worm on its output shaft that meshes with a gear-sector paul that operates the latch bolt. It is not structured to include backset choices, a crosspiece fin, a plunger which is practically a one piece assembly and is held rigidly together directly in one axis line for greater efficiency and durability. 
     Similarly U.S. Pat. Nos. 3,576,119 and 3,751,086 to Harris and Geringer, respectively, have a solenoid mounted directly on the door. 
     In U.S. Pat. No. 3,890,608 to Peterson the solenoid is linked to the bolt. 
     A system kinematically identical to that of Peterson is seen in U.S. Pat. No. 4,169,616 also to Peterson which uses a pneumatic actuator. 
     All such arrangements are fairly bulky, making it impossible to mount them on the inside surface of the thin (narrow) stile of a standard metal-and-glass entrance door of the type used in shops and offices, etc., in such a manner that it can be actuated from outside the door by a standard rim key cylinder. 
     A partial solution to this problem of retrofitting an existing (narrow) thin-stile door is proposed in U.S. Pat. No. 4,099,752 to Geringer. However, the mechanism of this patent is extremely complex. 
     With all these arrangements manual actuation of the lock is frequently impossible, and it is often also impossible to cut out the lock by holding it in a position with its bolt fully retracted. What is more, such locks are normally only set up for one particular type of installation, for instance, an in-swinging door; that cannot be adapted at the site to different setups. 
     The Savarieau et al. and Bright references basically are to latch or fasten the door in a locked position rather than as an alternate to keep a door unlocked, without the use of the bolt, crosspiece fin, and plunger assembly structure. 
     Curtiss et al. and Flodell&#39;s strikes do not use one part of the assembly for outswing doors and another part of the assembly for inswing doors, etc. 
     Rifkin, Hamilton, Cleff, Rau, Spinello, Ewing, Pond, and Nikolaus have their relative differences too. 
     O&#39;Brien&#39;s 82 is a threaded member which engages mounting plate 28 and rear housing plate 16, the latter being locked in place by a key 84. It appears that 86 is a shaft on the other side connected to handle 90 and cam 88. 
     O&#39;Brien&#39;s invention is mainly a motor driven unit with an added solenoid and with mechanical apparatus of a different character and different objectives than that of the present invention including backset choices, bolt, crosspiece fin, and plunger assembly structure, etc. 
     3. Description of the Prior Art: (Continued) 
     Povlich U.S. Pat. No. 2,786,701 shows a lock for an automobile door. Its bolt shaft does not movably extend through both the throughbores of an anvil and a plunger, nor is it so movably mounted. It needs a second solenoid to keep it in locked position. Its switch is to control a light. It and its housing do not accommodate interchangeable and reversible parts, and reversible parts and it do not mount on from narrow to large stile doors, or slam lock on inswinging and or outswinging doors, with solenoid power on. 
     In the French reference 559,461, the bolt head or bolt 18 here, which is actually diametrically tapered, enters and lies within the core member 4, and within its solenoid 5. It does not have a bolt shaft running through both of its core members 6 and 4 and one of them is solid. The removable means 8 here is with a thread in a deeply enclosed area of its mechanism requiring a lenthly operation to accomplish its means, not a quick and simple means of just removing a clip at the end of a shaft easily accessible. It is not mountable on narrow to large stile doors, and the strike 28 has multiple moving parts and does have an independent single function. 
     The four sided box of the Austrian reference 103,785 has no facilities for interchangeable parts or for reversing parts and is not facilitated to be mounted on narrow to large stile doors. 
     The Heyer U.S. Pat. No. 2,516,991 teaching shows a means, where its bolt head 32 is retracted to line-up with its screw 31, and with its hole 35, so that the screw 31 can be reached there, and so loosened and then the bolt head 32 can then be turned 180°. And so by doing this, the lock here would not have to be taken apart, to accomplish its means. The bolt here does not have a shaft running through both an anvil and a plunger for a compact electronic service, with a clip at the end of said shaft being a means for receiving a bolt assembly. 
     Another principal disadvantage of such locks is that they must be made in many totally different models to accommodate different features, depending on security requirements. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is an exploded perspective view of the improved lock of the present invention; 
     FIG. 2 is a plan view, showing the internal parts of the improved lock of the present invention when the improved lock is in the unlocked position with the electric current off; 
     FIG. 3 is a plan view, showing the internal parts of the improved lock of the present invention when the improved lock is in the locked position with the bolt extended; 
     FIG. 4 is a plan view, showing the internal parts of the improved lock of the present invention when the improved lock is in the unlocked position with the bolt assembly in the housing; 
     FIG. 5 is a plan view in partial cutaway showing the bolt in relationship to the strike when the bolt is in the relative position of FIG. 4, with lock mounted on a narrow stile door (in dotted lines) 
     FIG. 6 is a plan view in partial cutaway showing the bolt in relationship to the strike when the bolt is in the position of FIG. 3, with lock mounted on a large stile door (rim) 
     FIG. 7 is a plan view in partial cutaway showing the bolt in relationship to the strike when the bolt assembly is reversed compared to bolt in FIG. 6, with lock installed on a narrow stile door (in dotted lines) 
     FIG. 8 is an exploded plan view showing how, if necessary, the bolt assembly is reversed. 
     FIG. 9 is an exploded perspective view of an alternate embodiment of the invention shown in FIG. 1. 
     FIG. 10 is a view showing parts of the alternate embodiment of the invention shown in FIG. 9 assembled. 
     FIG. 11 is a plan view showing the alternate embodiment with the bolt assembly advanced. 
     FIG. 12 is a view showing the alternate embodiment with the bolt assembly advanced. 
     FIG. 13 is a view showing the alternate embodiment with the bolt assembly retracted, by the front knob and lever assembly. 
     FIG. 14 is a view showing the alternate embodiment with the bolt assembly retracted and reversed. 
     FIG. 15 is a view showing the alternate embodiment with the bolt assembly retracted to activate the current reduction switch; 
     FIG. 16 is a plan view with the bolt assembly retracted and the adjustable backset in one position; 
     FIG. 17 is a plan view with the bolt assembly retracted and the adjustable backset in another position; 
     FIG. 18 is a plan view showing internal parts when bolt assembly is advanced; 
     FIG. 19 is a plan view showing another alternate embodiment; 
     FIG. 20 is a plan view showing another alternate embodiment; 
     FIG. 21 is a perspective view of the housing receiving a cosmetic closure plate. 
     FIG. 22 is an exploded perspective view of alternate assembly embodiments of the invention shown in FIGS. 1 and 9. 
     FIG. 23 is a view of an alternate rack gear bridge. 
     FIG. 24 is a view of an alternate assembly embodiment of the invention. 
    
    
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide an improved lock which avoids the disadvantages of the prior art. 
     More particularly, it is an object of the present invention to provide an interchangeable Fail-Secure and Fail-Safe electric and mechanical lock that freely locks the door when the door is slammed shut, and is not jimmyable by a plastic card, and includes interchangeable and reversible bolt assemblies for in and/or out swinging doors and also adapts to, from narrow stile to large stile door installations. 
     In keeping with these objects, and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a lock which comprises a special housing that accommodates interchangeable component parts and component parts in different positions, a solenoid that is disposed within the housing, an interchangeable plunger movably mounted within the solenoid, a first bolt assembly having a bolt and its shaft being removably mounted within an interchangeable plunger and with a crosspiece, a second bolt assembly being interchangeable with the first bolt assembly and having a bolt, a removably mounted crosspiece, and a plunger and the plunger being removably mounted within the solenoid, and means for removably mounting the second bolt assembly and the plunger from within the solenoid, and lock having means for removably mounting the first bolt assembly and its shaft part from within the associated plunger and solenoid, a clip is provided. 
     Besides having a manufacturing and a mounting instructions cost effective advantage, said lock having its interchangeable feature, also has an advantage when a customer wishes to change a Fail-Safe installation for an adjustable backset Fail-Secure or total mechanical installation or visa versa, as the surface mounting installation in all the cases here are identical and the same strikes are used. 
     When the improved lock is designed in accordance with the present invention, the bolt assemblies can be rotated to fit inswing and outswing door applications. 
     In accordance with another feature of the present invention, the removably mounting means include a removably mounted crosspiece. 
     Yet another feature of the present invention is that the housing can accommodate interchangeable component and reversible parts and narrow to large stile door installations and another feature of the present invention are the adjustable backset plate assemblies to accommodate a key cylinder on a door at various different backset settings. 
     Still another feature of the present invention is that it further comprises an electrical lever switch so that the current supplied to the solenoid is decreased in an effort to keep the solenoid cool during continuous use. 
     Yet still another feature of the present invention is that the bolt is made from nonmagnetic material. 
     Still yet another feature of the present invention is that the Fail-Safe bolt assembly has a shaft with a free end that contains a groove for a clip. 
     Another feature of the present invention is that the shaft has a wide portion, and a narrow portion, the narrow portion has a first spring disposed thereon. 
     Yet another feature of the present invention is that the plunger has a second spring disposed thereon and a central throughbore. 
     Still another feature of the present invention is that it further comprises an anvil with a central throughbore disposed within the solenoid. 
     Yet still another feature of the present invention is that the anvil and the plunger are made from magnetic material, for electronic use. 
     Still yet another feature of the present invention is that the anvil and the plunger have complementary surfaces that are in magnetic contact, for electronic use. 
     Another feature of the present invention is that it further comprises a clip removably mounted on the groove of the shaft of the Fail-Safe bolt assembly. 
     Yet another feature of the present invention is that the bolt assemblies are interchangeable and each having a plunger removably mounted within the solenoid, the bolts each of which having a ramped and flat surface engaged in a strike so that when each or either of the bolts, or bolt assemblies cannot be forced back by a plastic card or the like. 
     In keeping with these objects, and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a lock which comprises a housing, a solenoid disposed within the housing, a plunger movably mounted within the solenoid, a bolt assembly having a bolt and shaft and being removably mounted with the plunger and lock wherein a compact means for retracting the bolt assembly, while the lock is electronically in the locked position, is provided. 
     When the improved lock is designed in accordance with the present invention, when the door slams closed, the bolt and its assembly will initially retract as it encounters the strike and then subsequently the bolt part will extend into the strike. 
     Another feature of the present invention is that it further comprises a bridge being disposed internally to the housing and having a rack gear, a main portion, a gear portion, and a track portion. 
     Yet another feature of the present invention is that it further comprises a clamp plate having a central throughbore, pin holes, and a track protrusion, to accommodate the removably mounted crosspiece. 
     Yet still another feature of the present invention is that the bolt has pin protrusions which mate with the holes of the clamp plate. 
     Still another feature of the present invention is that the bridge has a substantially &#34;L&#34;-shaped cross-section, and an alternate with a headpin feature. 
     Still yet another feature of the present invention is that it further comprises a crosspiece containing a cutout and protrusions. 
     The novel features which are considered characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of the specific embodiments when read in connection with the accompanying drawings. 
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIGS. 1-7, the improved lock of the present invention is shown generally at 10. The improved lock 10 includes a housing 12 which is substantially a four sided open multi feature box with sides 81, 82, 83, 84 and an open side 85 with side 83 having a bolt opening 128 which accommodates interchangeable component parts and reversible parts and can be mounted on various different, from narrow stile to larger stile doors, with a removeable cover plate 16. 
     Plate 16 is used to cover opening 85 of housing 12 to be attached thereto with screws (not shown) utilizing the clearance holes 144a in cover plate 16 and threaded holes 144b of housing 12. Lining up clearance holes 131a of plate 16 with clearance holes 2a of housing 12 with screws (not shown) are used to mount lock 10, when assembled, on door or door stile inside surface 109c. 
     Internal to the housing 12 is located a solenoid assembly 18 having an anvil side 20 facing bolt opening 128, a plunge in side 22, and a solenoid coil core hole 24, containing an anvil 73, made of magnetic material affixed at side 20. The solenoid assembly 18 contains an electrical lever switch 26. 
     Extending into the solenoid coil core hole 24 from the plunge in side 22, is the first plunger assembly 59 containing the center shoulder hole 58 which is part of central throughbore 58a therein. 
     The first plunger assembly 59 has a front end 60 which is substantially frustum shaped and a rear end 62 and is rigidly affixed within the central throughbore or hole 64 in crosspiece 66. A spring 68 having a front end 70 and a rear end 72 freely fits on the first plunger assembly 59. 
     The front end 70 of the spring 68 abuts against the outer plunge side 22 of the solenoid assembly 18 and the rear end 72 of the spring 68 abuts against the affixed crosspiece 66 and by doing so, urges the plunger assembly 59 outward of the coil core 24. 
     Seen in FIGS. 1 through 4, plunger 59a, made of magnetic material is moveably mounted within the core 24 of solenoid 18 with spring 70 and affixed crosspiece 66 made of nonmagnetic material attached. 
     FIG. 1 shows solenoid assembly 18 by utilizing its threaded mounting holes 3 and 4 is lined up with holes 3a and 4a inside of main housing 12 closer to bolt opening 128 and is, there attached with fasteners or screws 2b in position as shown in FIGS. 2, 3, and 4, and 8, here for Fail-Safe operation. 
     The anvil 73 fits snugly in the coil core 24 and the first plunger 59a of first plunger assembly 59 runs freely back and forth along axis A&#39; in the coil core 24. 
     Referring now to FIGS. 2 through 4, an anvil 73 with a rear side 75 is rigidly affixed internally to the solenoid assembly 18 and contains a throughbore 76. The rear side 75 of the anvil 73 is so formed so as to complementary receive the frustrum shaped front end 60 of the plunger assembly 59 where the wide shaft section 40 of the bolt assembly 28 runs freely in the throughbore 76 of the anvil 73 and the narrow shaft section 42 runs through the center shoulder hole 58 which is part of throughbore 58a running through the entire center axis of the first plunger assembly 59 of axis A&#39; running between locked and open positions. 
     The bolt assembly 28 has a bolt 80 with a front side 32 having a beveled ramp 125a and a rear side 36. Extending from the rear side 36 of the bolt 80 is a bolt shaft 38. The bolt shaft 38 includes a wide section 40 and a narrow section 42 which is colinear with the wide section 40. A shoulder 44 is formed where the wide section 40 meets the narrow section 42. 
     The narrow section 42 has a free end 46 with a circumferenced groove 48 for receiving a clip 50. A spring 52 having a front end 54 and a rear end 56 is located on the narrow section 42 so that the narrow section 42 fits freely through the spring 52. The front end 54 of the spring 52 abuts against the shoulder 44 because the diameter of the spring 52 is substantially equal to that of the wide section 40. The rear end 56 of the spring 52 abuts against the inner center shoulder area of hole 58 urging the bolt assembly 28 forward. 
     The narrow section 42 of the bolt assembly 28, as seen in FIG. 8, slides through the center throughbore 58a and shoulder hole 58 of the rear end 62 of the plunger assembly 59. 
     The clip 50 is insertable into the circumferenced groove 48. 
     The interchangeable first bolt assembly 28 all made of non-magnetic material, enters housing 12 through bolt guide opening 128. The first bolt assembly shaft areas 40 and 42 shown in FIGS. 2, 3, 4 and 8 run through and within the anvil throughbore 76 and also through the plunger throughbore hole 58 and 58a, and with circumference groove 48 of shaft area 42 extending out of rear end 62 of plunger assembly 59. As seen in FIGS. 3 and 4, first bolt assembly 28 is movable between locked and open positions, for Fail-Safe latching. 
     In operation, this Fail-Safe assembly of the improved lock 10 of the present invention is shown, in FIG. 2, in the unlocked or open position, when the electric current is off, solenoid not energized. 
     When current is turned on energizing the solenoid as shown in FIG. 3, the anvil 73 magnetically pulls the plunger assembly 59 displacing the crosspiece 66 so that the crosspiece 66 pushes the electrical lever switch 26. By activating the electrical lever switch 26, the current supplied to the solenoid assembly 18 is decreased so that the solenoid assembly 18 will remain cool while it is in continuous use magnetically holding the plunger assembly 59 in contact with the anvil 73 which holds the improved lock 10 in the locked position with the bolt assembly 28 extended as seen in FIG. 3. 
     As shown in FIG. 3, the improved lock 10 is electronically in locked position. As the solenoid assembly 18 is energized, as current is on, and the plunger assembly 59 is holding the anvil 73 in magnetic contact. However, the bolt assembly 28 is still able to retract as seen in FIG. 4, as the spring 52 compresses and the bolt shaft sections 40 and 42 passes or slides through both the center throughbore 73 of anvil 76 and the center throughbore 58a and 58 of plunger 59a here of solenoid 18, as shown in FIG. 5. As the bolt 80 of assembly 28 proceeds latching into strike 120 and compresses the spring 52 so that as the in-swing door 109 is closing, the bolt 80 can enter the associated strike cavity 120. 
     FIGS. 5 and 7, also shows the narrow stile door 111b and 109b (dotted lines) with the larger stile door 111 and 109, having mounted thereon a Fail-Secure and all mechanical lock 10a having a key cylinder 101 instead of the Fail-Safe lock 10 described above. Either type door can be accommodated by either interchangeable Fail-Safe lock 10 or the Fail-Secure and all mechanical lock 10a. 
     FIG. 6 also shows lock 10a mounted on door 109. The bolt 80 or 80b is entered into strike cavity 120 of strike 120a mounted on the door frame 109a bringing lock 10a into the locked position. 
     Seen in FIGS. 1, 9, 21 and 22, the housing 12 has six mounting holes for mounting the lock on doors, with screws 2. The four front holes 2a on the housing 12, two on each side, are used for narrow stile installation. All six holes 2a, and 2c can be used on wider stile doors. This arrangement is applicable to both Fail-Safe and Fail-Secure locks 10 and 10a. 
     FIG. 8 shows the clip 50 removed from the groove 48 of the narrow section 42. The bolt assembly 28 is pulled forward out of the lock 10, for the purpose of turning the bolt assembly 28, 180° on its axis &#34;A&#34;, reversing its bevel ramp 125a for use in either inswinging doors 109b or outswinging doors 111 or 111b with the associated strikes 120 and 121 on door frames 109a and 111a respectively. 
     Referring now to FIGS. 9 to 18 where an alternate embodiment of the improved lock is shown generally at 10&#39;. The lock 10&#39; includes the housing 12 having a closed top 85b and four closed sides 81, 82, 83 and 84 and an open area 85. The adjustable backset plate assembly 86 closes the open area 85 of the housing 12. 
     For Fail-Secure use as seen in FIGS. 9 to 18, the solenoid assembly 18 is set into the main housing 12 with plunge in side 22 facing bolt opening 128, 180° relative to the Fail-Safe setting. For Fail-Secure use, the threaded mounting holes 3 and 4 of the solenoid assembly 18 is lined up with holes 3a and 4b of the main housing 12 furthest back from bolt opening 128, as seen in FIG. 9. Solenoid assembly is secured with fasteners or screws 2b as seen also in FIGS. 11 through 15. 
     The interchangeable second bolt assembly 28b, seen in FIG. 10, but with crosspiece 66b unattached, enters the housing 12 through bolt guide opening 128 in FIG. 9. The plunger 59b of bolt assembly 28b enters from the plunge in side 22 into the core opening 24 of solenoid assembly 18, and the crosspiece 66b is attached. 
     The bolt 80b, clamp plate 67, and plunger 59b of bolt assembly 28b are fixedly attached to each other. The plunger 59b has an outer screw thread 110 thereon, and the bolt 80b has an inner threaded hole 112 contained therein. 
     The bolt 80b has pin protrusions 114 which mate with holes 116 of the clamp plate 67, while clamp plate throughbore 67a lines up with the internal threaded hole 112, and a track protrusion 118. 
     The crosspiece 66b has a cut out 119 which allows the crosspiece 66b to slide into place between the bolt 80b and the clamp plate 67 along the track protrusion 118 of the bolt 80b. 
     The ball protrusions 113 of the crosspiece 66b force their way against the clamp plate 67, which is made from flat springy material, and causes the crosspiece 66b to be pushed into place in the bolt assembly 28b. The ball protrusions 113, keep the crosspiece 66b in place, when the protrusions 113 come out just below the bottom of the clamp plate 67 seen in FIG. 10. 
     Then as seen in FIG. 11, the attached crosspiece 66b with the aid of front lever 214b, which is also used to bring this lock 10&#39; to open position (see FIG. 13) holds the interchangeable second bolt assembly 28b here removably mounted and or movably mounted in lock 10&#39; for Fail-Secure latching. 
     The thumb-turn knob 126 causes movement from the front of the lock 10&#39; on the inside part of the door 109c seen in FIG. 5. Part 5d and 5b of knob shaft 50b enters through hole 5 with shoulder 5f bearing on top side 85b of housing 12 in FIGS. 1, 9, 12 and 21. Part 5d of knob shaft 50b is fixably attached in hole 214k of lever 214b. When cover 212 is in place, part 5e of shaft 50b is brought into hole 126b of knob 126 and fixably fastened together with screw 126a in FIG. 9. When knob 126 is manually turned, the lever 214b in turn, turns and lever part 214c pushes crosspiece 66b and bolt assembly 28b backward within the lock 10&#39; in FIG. 13, putting the lock in the unlocked position. 
     The housing 12 has a hole 5 seen in FIG. 21, FIG. 9 and FIG. 1, for the accommodation of the knob 126 seen in FIGS. 9, 12, 13, 14 with the knob shaft 50b and the lever 214b, which is used only Fail-Secure assemblies, not needed with Fail-Safe assemblies. 
     A cosmetic cover plate 212 in FIG. 21 is used to hide the holes, and the screw heads in the closed top 85b of housing 12 after a lock is installed for use. Where a lock is assembled for Fail-Safe use, the hole 6 is not included in cover 212, for here cover 212 also hides hole 5 of housing 12 cosmetically. But for Fail-Secure use of the hole 6 in cover 212 is implemented to make clearance for knob shaft 50b used with knob 126 and lever 214a. 
     FIG. 12 shows cosmetic cover 212 going over installed lock 10&#34;. Then knob 126 is in line for installation. 
     FIG. 13 shows all said parts assembled together, retracting bolt assembly 28b. 
     Housing 12 and u shaped cover 212 are attached here by using screws 212a, holes 212b, and threaded holes 212c in FIG. 21. 
     The adjustable backset plate assembly 86, as shown in FIGS. 9 through 18, is composed of a bushing 98 and a rectangular backset slide plate 133 which contains a cylindrical bearing hole 133b to receive the bushing 98 on one side along the center line of the longer length. 
     A small distance from the axis &#34;A&#34;, in the backset slide plate 133, runs a thin slot 133a. The slot 133a extends almost to the end of the backset slide plate 133. On the center line of the backset plate 131, running lengthwise to almost one end, is a rectangular opening 86a which is slightly smaller than the rectangular slide plate 133. 
     At the sides of the opening 86a, running parallel to the center line &#34;A&#34; are two tracks 86b which mate with tracks 86c of a square slide 132 for controlling the sliding action thereon. A threaded hole 140a, disposed in the adjustable backset plate 131 and parallel with the center line &#34;A&#34;, controls the movement of the rectangular slide 133 along the center line &#34;A&#34; when joined with a screw 140. The screw 140 is tightened so that it may securely fasten the rectangular slide 133 in the desired position. 
     The bushing 98 which receives part 101a of key cylinder 101 into the bushing opening 98d, has a cylindrical stem 98c which is centered on the axis A&#39;. The bushing stem 98c in turn enters through the bearing hole 133b of the slide plate 133 and is journaled there at a &#34;T&#34;-end or shoulder 98b. The other end 98c extends through the rectangular opening 86a of the adjustable backset plate assembly 86 and enters through a bearing hole 132a of the square slide 132. The bushing stem 98c in turn is fitted on the other side of the plates 133, 131, and 132a and fixably fastened into the hole 211z of an actuation element cam lever 211 or the hole 100z of on the spur gear 100. The cam lever 211 has an eccentric actuating tab 211a extending parallel to but offset from the axis A&#39;. 
     The assembled adjustable backset plate 86 is screwed into the lock 10&#39; using two appropriate symmetrically placed mounting holes 144a with the screws 144 and the threaded holes 144b of housing 12 in relative position, as shown in FIGS. 9 and 11. When the slide plate 133 and the bushing 98 with lever 211 or with spur gear 100 is set closer to the bolt 80b of bolt assembly 28b and the crosspiece 66b front end of the lock 10&#39;, it is then set for the smaller lock backset settings, as shown in FIG. 11. 
     The slide plate 133 and the bushing 98 in the first group of settings can be set further back and away from the bolt 80b of bolt assembly 28b and the crosspiece 66b from the front area end of the lock for larger measurement backset settings, as shown in FIGS. 11, 14, 17, and 24, for the first half of the back setting span. 
     For the still larger backset settings the backset plate assembly 86 is unattached and is turned 180° and set back in with the screws 144 in a facing position, as shown in FIGS. 13, 15, 16, and 18, for the still larger backset settings in the second half of the back setting span. 
     When a key is turned in the key cylinder 101 mounted to be used from the outside of a door, it in turn, turns bushing 98 and then the attached spur-gear 100 (or lever 211). When the bushing 98 is attached to spur-gear 100 from what ever backset it is set to, that is, from close to the front of the lock 10&#39; to close to the back of the lock 10&#39; according to the type of door it must serve, the teeth portion 100a of the spur-gear 100 mesh with the teeth portion 94 of the rack gear bridge 90, it can be activated from any backset setting from the smallest to the largest. 
     The rack gear bridge 90 is attached to the rack gear base 92 which has a &#34;L&#34; shape cross section and is movably situated and also guided to ride from front to back, back and forth there-in in the direction of &#34;A&#34; between the inner side 104 of the adjustable backset plate assembly 86 and the portion area 19 of the solenoid assembly 18. The track portion 96 rides in the groove guide points 102, as seen in FIG. 12. Another alternative part of this present invention is the adjustable slotted backset plate assembly 86k, shown in FIGS. 22 and 24, the connections from the bushing 98 to the spurgear 100 are the same. 
     The rectangular slide 133k has two slots 133a and two screws 140 and two threaded holes 140k in plate 131k. The plate 131k also has four enter holes 960 to 963 with extending side slots 960a to 963a. 
     The rack gear bridge 90k as also seen in FIG. 23 has a head-pin 102m fixably inserted with clearance 102s to clear the thickness of plate 131k at the top area of bridge 90k with a stem 106m, extending through the bottom area. Headpin 102k is fixably inserted with clearance 102s at the top area of bridge 90k and at the bottom area having no stem. 
     For the smaller backset settings, headpin 102m is past through enter hole 960 and headpin 102k is past through enter hole 961 from the inner side 104 of plate 131k. Now there with this rack gear bridge 90k in movable contact with inner plate side 104 surface and rack gear teeth 94k, meshing with spur gearteeth 100a and with the extending slide slots 960a and 961a receiving clearance area 102s of headpin 102m and 102k. Then with said headpin movably mounted in contact with the outer plate side 104a surface, the rack gear 90k as seen in FIG. 24, can move so guided from front to back, back and forth therein, in the direction of &#34;A&#34;. 
     Interchangeable with adjustable backset plate assembly 86, this adjustable slotted backset plate assembly 86k, is installed so that the extending stem 106m of rack gear 90k, makes contact with crosspiece 66b activate bolt assembly 28b, for the smaller backset settings. For the larger backset settings the interchangeable adjustable backset assembly plate 86k is turned 180°, the rack gear bridge 90k is set so that the headpin 102m utilizes enter hole 962 and slot 962a of adjustable backset plate 86k and the headpin 102k utilizes enter hole 963 and slot 963a, with following the related just before, stated operational procedure. 
     When the bushing 98 is attached to lever 211, the lever 211 will ride over the bridge 87. The bridge 87 is guided as is with bridge 90, its track portion 96a, riding in groove guides 102. The lever tab 211a is put into the appropriate selected opening 124a, b, c, or d, 124a for smallest backset position, 124d for longest as shown in FIGS. 19 (lock 10&#39; being in locked position) and 20 (lock 10&#39; being put into unlocked position). When the lever 211 is swiveled, from either selected backset position Pa, Pb, Pc, Pd, Pe or Pf, position Pa being for the smallest backset position and Pf for the largest the lever tab 211a butts up against a slat 87a, b, c, or d, slat 87a for the smallest backset and slat 87d for the largest and forces the bridge 87 backward. As is also the case when the bushing 98 is attached to spur-gear 100 and moves the rack gear bridge 90. The bridge tab 106 or 106a butts up against the crosspiece 66b in order to move the bolt assembly 28b backwards against the tension of spring 108 (as seen in FIG. 14) within the lock and therefore putting the lock into the unlocked position so door can be opened. 
     FIG. 15 shows where the bolt assembly 28b is pulled in electronically at full power of the solenoid assembly 18, putting the improved lock 10&#39; in an open position against pressure of the spring 108. This causes the crosspiece 66b to encounter and activate the electrical lever switch 26, which reduces or cuts down power of the solenoid assembly 18. This avoids overheating of the solenoid assembly 18 when it is desired to still hold the bolt assembly 28b in for long periods of time with the electric current on. 
     When all the electric power to the lock&#39;s electric mechanism is turned off, the spring 108 pushes the bolt assembly 28b out as seen in FIG. 11. 
     Seen in FIG. 10, the crosspiece 66b is removable, so that the bolt assembly 28b can be removed from the improved lock 10&#39; through the bolt guide opening 128, and so that the beveled side 125 of the bolt assembly 28b can be reversed on axis &#34;A&#34;, 180° to facilitate its use on either, in or out swing door operations. 
     The case 18p with anvil 73 and tube 24p seen in FIGS. 22 and 24 interchanges with solenoid 18 of FIGS. 9 to 18 for the lock 10&#39; to be made or produced cost effective without the electric wiring where only the mechanical advantages of this lock 10&#39; is needed. As seen in FIG. 22 and FIG. 24 the case 18p with anvil 73 and tube 24p is fastened into the housing 12 utilizing screws 2b in holes 3a and 4b and holes 3p and 4p therein. And in FIG. 24 it is seen in its working assembly. 
     With narrow stile installations of lock 10&#39;, as only the front four mounting holes 2a seen in FIG. 21 are used, mounting holes 2c  together with machine screws 213p seen in FIGS. 22 and 14, can be used to attach the back shield plate 213k via its affixed threaded spacer bushings 213m to the rear back of the lock 10&#39; to shield this area where housing 12 extends past the narrow stile.