AU2004242516B2 - Improvements in Locks - Google Patents

Description

1 5 10 Title Improvements in door locks 15 20 25 30 The following statement is a full description of this invention, including the best method of performing it known to me:- 2 Summary of the Invention According to the invention there a lock including a casing, an angularly displaceable engaging member defined in part by a pivotal axis and supported relative to the casing, 5 a clutch member supported by the engaging member disposed from its pivotal axis and displaceable in response to angular displacement of a cam , the engaging member being displaceable between a fully rotated and a retracted configurations by the cam when the clutch member acts to operably couple the engaging member and cam, 10 the engaging member able to be operably connected to the casing (to be locked) by displacement of the clutch member in response to relative displacement between the engaging member and cam. In some forms of the invention, the engaging member has an arcular 15 shoulder defined in part by an inner and an outer surface each said surface being substantially cylindrical having and defined relative to a longitudinal axis coaxila with the pivotal axis of the engaging member, a ball supported within a substantially radial aperture shoulder to protrude from the one one and/or the other suface of the arcular 20 shoulder, the arcular shoulder being supported coaxially within a substantally cylindrical recess of the casing defined in part by a side surface with which the arcular shoulder mates with working clearance, the cam supported coaxially within the engaging member and having an 25 outer cam surface that mates with clearance within the inner surface of the arcular shoulder, the engaging member being displaceable between the fully rotated and retracted configurations by the ball when it is displaced in reponse to cam rotation, 3 the cam being angularly displaceable to displace the ball to casue it to couple the engaging member to the casing whereby to restrain it against displacement. 5 In some forms of the invention, the engaging member comprises an alternative engaging member having a longitudinally extended aperture having an opening in an orthogonal surface disposed from the pivotal axis, said longitudinally extended aperture being defined in part by an axis parallel to the pivotal axis, A clutch member comprising a pin supported within the longitudinal 10 aperture to protrude from the opening and/or the bottom face of the boss portion of the engaging member, the cam comprising an alternative cam supported coaxially within the engaging member has an cam surface that mates with clearance within the orthogonal surface of the engaging member and a cam recess into which the pin is 15 displaceable, the engaging member being displaceable between the fully rotated and retracted configurations by the pin when it is displaced in reponse to cam rotation, the cam being angularly displaceable to displace the pin to cause it to couple the engaging member to a casing comprising an alternative casing whereby 20 to restrain it against displacement. In some forms of the invention, the lock comprises a first lock portion comprising the casting, engaging member, clutch member and cam and a second portion including a first cylinder having a first barrel operably coupled with free 25 displacemnt to the cam, said barrel being operable to displace the engaging member between the fully rotated and retracted configurations, said key being removeable from the barrel when the engaging member is fully rotated and when it is retracted.

4 In some forms of the invention, the first lock portion includes a first operating member directly coupled without free movement to the engaging member, said enagaging member being displaceable by the first operating 5 member when not locked. In some forms of the invention, the first lock portion includes a second barrel operably connected with free displacement to the cam enabling the lock to be locked and unlocked by the second barrel 10 In some forms of the invention, the first lock portion includes a second operating member directly coupled without free movement to the cam and coupled with free movement to the engaging member, sad enagaging member being displaceable by the first operating 15 member when not locked between the locked and retracted configurations.. In some forms of the invention, the operating member is displaced downwardly to cause the enagaging member to displace towards the fully rotated 20 In some forms of the invention, the angularly displaceable engaging member has a hooked portion displaceable between an fully rotated position where the hooked portion protrudes from the casing and a retracted position where the hooked portion is substantially within the casing. 25 In some forms of the invention, the lock comprises a lock for a sliding wing. DESCRIPTION OF THE PREFERRED EMBODIMENTS Definitions and Conventions Employed within the Body of the Specification and Claims that follow: This specification describes inventions comprising improved complete locks 30 for displaceable wings and improvements for locks for displaceable wings that (for 5 convenience) are referred to herein as "locks" and throughout this specification and claims which follow, unless the context requires otherwise, the word "locks" or variations such as "lock" will be understood to imply the inclusion of complete locks for displaceable wings and improvements for locks for displaceable wings that are 5 transportable into other locks and locking devices without being limited to the complete locks described herein.. Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group 10 of integers but not the exclusion of any other integer or group of integers. Throughout this specification and claims which follow, unless the context requires otherwise, the positional prepositions such as rear, forward are used to assist in description of the preferred embodiments and with reference to the accompanying drawings and have in general no absolute significance. 15 Throughout this specification and claims which follow, unless the context requires otherwise, the word "preferably" or variations such as "prefer" does not mean nor infer that that the inventions described in the "Description of the Preferred Embodiments" are necessarily restricted to the form of an integer or collection of integers referred to as preferred. 20 Throughout this specification and claims which follow, unless the context requires otherwise, the words 'Wing" embraces both doors and windows. Throughout this specification and claims which follow, unless the context requires otherwise: In isolated use, the engaging member is displaceable between a fully 25 displaced disposition and a retracted disposition. When employed with an engageable means, the engaging member is displaceable between an operative disposition (a disposition in which the engaging member finds itself when engaged with the engageable means, i.e when it is latched) and an inoperative disposition removed from the said engagement. [In general, the operative disposition 30 corresponds to a fully displaced disposition but in other locks the engageable 6 means acts to limit the displacement of the engaging member. Within this specification, with reference to the disposition of the engaging member, fully rotated (angularly displaced) is synonomous with operative and retracted is synonomous with inoperative. 5 Latching means displacement of an engaging member into engagement with the engageable means to become latched. In relation to sliding wings this includes angular displacement of an engaging member having a hooking portion to a disposition where the hooking portion lies behind a shoulder of an engageable means comprising a catch plate. 10 Unlatching means withdrawal of the engaging member from engagement with the engageable means. An unlatching lever is a lever or knob that is hand operable to cause the engaging member to become inoperative. An operating member is a lever or knob that is hand operable to displace 15 the engaging member between the operative and inoperative configurations. Locking means configuring the lock to restrain it from being unlatched. Single cylinder is a cylinder comprising a key operable barrel within a cylinder housing, the barrel having an axially extended aperture by which to receive the key. 20 Description of the Preferred Embodiments Description of the Figures Embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is an isometric view from the outer side of a lock comprising the 25 assembly of an engaging member, cam, first operating member and a casing with the cover and attaching buttresses omitted for ease of description, Figure 2 is the lock of Figure 1, adapted to be reversible, Figure 3 is a side view of the lock of Figure 1 when viewed from the outerside, 30 Figure 4 is the lock of Figure 3, but having a second operating member 7 Figure 5 is the lock of Figure 1, 3 or 4 (with the operating member omitted for ease of description) having the engaging member in the fully rotated and locked configuration, Figure 6 is the lock of Figure 5, unlocked, 5 Figure 7 is the lock of Figure 5, with the engaging member in the inoperative configuration and the cam fully displaced to be in the unlatching configuration, Figure 8 is the lock of Figure 7, but with the cam in the undisplaced configuration, 10 Figure 9 is the lock of Figure 5 when viewed from the underside, Figure 10 is the lock of Figure 6 when viewed from the underside, Figure 11 is the lock of Figure 7 when viewed from the underside, Figure 12 is the lock of Figure 8 when viewed from the underside, Figure 13 is an exploded isometric view of the lock of Figure 1, 15 Figure 14 is the lock of Figure 5 adapted to be reversible, Figure 15 is the lock of Figure 14 viewed from the undeside, Figure 16 is the lock of Figure 14 in the reverersed disposition, Figure 17 is the lock of Figure 16 viewed from the underside Figure 18 is an exploded isometric view of the lock of Figure 14 showing 20 alternative operating members, Figure 19 is is an exploded isometric view of the lock of Figure 16 showing alternative operating members, Figure 20 is an exploded isometric view of the casing showing casing base with attaching buttresses, the casing lid, second cylinder and 25 screws for attachin the casing lid to the casing base; the handle and first cylinder; screws for connecting the handle to the casing. Figure 21 is an exploded isometric view of the catch plate. Figure 22 is an exploded view of a simplified embodiment of the lock with the the cover and attaching buttresses omitted for ease of description, 30 Figure 23 is a schematic side view of the lock of Figure 22, 8 Figure 24 is the lock of Figure 22 with a first and second cylinders included. Figure 25 is as exploded isometric view of an alternative embodiment of a lock, showing the assembly of an alternative engaging member, alternative cam, alternative first operating member and an alternative casing with the cover and 5 attaching buttresses omitted for ease of description. Figure 26 is a sectional view of the lock in Figure 25, having the engaging member in the fully rotated and locked configuration, Figure 27 is a sectional view of the lock in Figure 25 having the engaging member in the fully rotated and unlocked configuration,. 10 The inventions within this specification include a casing comprising a casing base 4 defined in-part by a casing floor 5 and an engaging member 6 that may comprise a first and a second part, 6A and 6b respectively, angularly displaceable about an axis of rotation 7 orthogonal to the casing floor, the engaging member being displaceable between an fully rotated configuration of 15 Figure 5 and a retracted configuration of Figure 7 The engaging member 6 has a hollow cylindrical boss portion 8 coaxial with axis 7 that extends towards the casing floor 5, this being defined by an outer radius r1 that defines the outer side surface 9 that defines the extent of the boss and an inner radius r2 that defines the inner side surface 10 that defines the 20 extent of the boss recess 11 within the boss 8, this portion in effect comprising an arcular fin 12 shown in Figure 9, that extends towards the casing floor and has a wall thickness of r1 -r2. This boss portion is within a coaxial substantially cylindrical casing recess 13 shown in Figure 13 defined relative to the casing floor and by a recess side 25 surface (also called a recess surface) 30 of radius of r1 (plus a working clearance to enable the boss to rotate within the casing recess) The casing recess may comprises a raised fin portion 14 of the casing floor 5 that extends towards the enagaging member to overlap the arcular fin 12. Supported coaxially within the recess 11 is a substantially cylindrical 30 angularly displaceable cam 15 that extends through the casing floor to be 9 supprted by the casing. This has adjacent to the boss recess, a first cam portion 16 having a substantially cylindrical outer cam surface 17 defined by a radius of r2 less a working clearance and shown in Figure 10. Within this surface is a peripherally extended clearance recess 18 defined by a depth k1 where k1 5 preferably comprises D/2, where D is the diameter of a ball described below. The recess preferably being bounded by angled planar connecting surfaces 19 one of which comprises a drive face 19A; in a form of the invention, cross-sections orthogonal to the pivotal axis of this this portion of the cam are all identical comprise a portion 20 of a circle of radius r2 integrally connected by angled 10 straight lines 21 to a portion 22 of a circle of radius r2 less k1. The cam 15, disposed from the casing recess 13, has a radially extending cam drive shoulder 23 as shown in Figure 5, defined by opposed faces 24 and 25 (that extend between two parallel planes orthogonal to the pivotal axis) these faces preferably being planar and substantially radially disposed. A portion of the 15 engaging member also extends into the space between the parallel planes orthogonal to the pivotal axis to overlap the cam drive shoulder, and it extends into an elongated arcular aperture 26 of the engaging member defined by a driven shoulder 27 with which the face 25 of the cam drive shoulder 23 mates with free movement, the arcular aperture may be further defined by a stop shoulder 28 20 angularly spaced from the driven shoulder 27. The components are configured such that the cam can be rotated in an unlatching direction (to an unlatching configuration) to cause the drive shoulder 23 to engage the driven shoulder 27 to cause the engaging member to displace to the inoperative configuration, whereupon, the cam can be rotated in the opposite direction to an undisplaced 25 disposition as the drive shoulder 23 moves freely within the arcular aperture 26. The engaging member can be displaced from the retracted disposition to the fully rotated configuration by rotation of the cam (from the undisplaced configuration in the opposite direction) to a latching disposition. Further rotation of the cam in the latching direction to a locking disposition, (while the engaging 10 member is stationery) locks the engaging member to restrain the engaging member relative to the casing. Supported by the engaging member is a clutch member that is displaceable between a first configuation in which it couples the engaging member and cam to 5 enable the engaging member to be displaced by the cam and a second configuration where it couples the engaging member relative to the casing to restrain the engaging member from being rotated, the clutch member being displaced between confurations by relative angular displacement between the cam and engaging member. In some embodiments, there is within the arcular fin 12, a 10 substantially radial aperture 29 that extends from surface 9 to surface 10 and within this aperture is a clutch member comprising a ball of diameter R, 31 that extends from the recess surface 30 to protrudes from surface 10 into the clearance recess 18 of depth k1 of the cam. The parts are configured such that when the cam is undisplaced and the 15 engaging member is retracted, the ball abuts one of the angled planar connecting surfaces 19 to operably couple the cam and engaging member. When the cam is displaceded from the undisplaced disposition, (in a latching direction) the angled suface, drive face19A of the cam acts on the ball to cause it to displace simultaneously as the cam, the ball simultaneously acting on a wall of the aperture 20 29 to cause the engaging member to displace sumultaneously as the ball. When the enagaging member is in the fully rotated configuration, it is restrained from further displacement by engaging a stop shoulder 32 of the casing. At this configuration of the engaging member, the radial aperture 29 is axially aligned with a casing recess side aperture 33 having a width sufficient to 25 accept the ball and preferably radially elongated to accept a spring and second ball. As the cam is further rotated from the latching to the locking configuration, the angled planar connecting surface acts on the ball to displace it radially outwardly so that it extends from the cam surface 17 to extend from the outer side surface 9 into the side aperture 33 to couple the engaging member and casing and hence 30 restraining it relative to the casing.

11 Within the side aperture is preferably a second ball 34 inwardly biased by a compression spring 35 towards the first ball such that as the cam is rotated from the locking disposition (in an unlatching direction) to bring the the cam clearance recess 18 into alignment with the side aperture, the second ball acts on 5 the first ball to cause it to occupy the clearance recess and when the cam is further rotated, the ball becomes restained in the cam clearance recess 17 while abutting the casing recess surface 30. Further rotation of the cam in an unlatching direction then brings the cam drive shoulder 23 into contact with the driven shoulder 27 described above. The cam can then be further rotated in an unlatching to cause 10 the engaging member to be displaced to the inoperative configuration, whereupon, the cam can be rotated in the opposite direction to the undisplaced disposition (as described above) as the drive shoulder 23 moves freely within the arcular aperture 26. When the engaging member is in the fully rotated configuration, the cam is 15 in the latching configuration and the ball is in contact with the drive shoulder 23 of the cam, the drive face 19A is angled to present a wedge-like feature to the ball such that displacement of the drive face 19A towards the ball (which is restrained in the radial aperture) causes the ball to slide up the wedge from the clearance recess to abut the cam surface 17 to displace towards the side aperture 33; the 20 drive face 19A exerting a vector force on the ball having a radial component in a direction parallel the axis of the side aperture. The other embodiments an alternative clutch member is displaceable in a direction parallel the pivotal axis of the engaging member between a first configuation in which it couples an alternative engaging member an alternative 25 cam to enable the alternative engaging member to be displaced by the alternative cam and a second configuration where it couples the alternative engaging member relative to the alternative casing to restrain the alternative engaging member from being rotated, the alternative clutch member being displaced between confurations by relative angular displacement between the alternative cam and alternative 30 engaging member. In these embodiments, the alternative engaging member 206 12 comprises the first and an alternative second portions, 6A and 206b respectively, angularly displaceable about an axis of rotation 7 orthogonal to the alternative casing floor where portion 206B has cylindrical boss portion 208 coaxial with axis 7 that is defined by an outer radius r3 and that extends to the 5 alternative casing floor 5. The boss 208 includes an axial apertures 209 and an orthogonal surface 210 that lies in a plane between the underside of portion 206A of the engaging member and the alternative casing floor and that supports the alternative clutch member 211 that is displaceable in a direction parallel the pivotal axis of the alternative engaging member. 10 In some such embodiments, the alternative engaging member 206B includes two connected substantially cylindrical apertures defined by a common axis that is coaxial with the alternative engaging member pivotal, a first aperture 212 of depth d4 and radius r4 adjacent the alternative casing floor and the adjacent cam recess 213 of depth d5 and larger diameter r5, the diffence in radii 15 defining an annular orthogonal surface 214 that is parallel the alternative casing floor and displaced from that floor. Supported coaxially within the engaging member is an angularly displaceable alternative cam 215 that extends through the alternative casing floor to be supprted by the alternative casing . This has a first alternative cam portion 20 216 overlapping the orthogonal surface 210 itself comprising a cam surface 217 parallel to the orthogonal suface and adjacently disposed. In some such embodiments, the first alternative cam portion comprises a disc of radius r5 (less working clearance) and of depth r5 (less working clearance) connected to a second cam portion of radius r4 (less working clearance) that 25 extends through the alternative casing floor to be supported by the alternative casing . The cam has adjacent to the boss orthgonal surface 214 a substantially parallel alternative cam surface 217. Within this cam surface is a peripherally extended clearance recess 218 defined by a depth k1 where k1 preferably bounded by angled peripheral planar connecting surfaces 219.

13 The alternative cam 215 has a radially extending cam drive shoulder 223 defined by opposed faces 224 and 225 (that extend between two parallel planes orthogonal to the pivotal axis) these faces preferably being planar and substantially radially disposed. A portion of the engaging member 6A also extends 5 into the space between the parallel planes orthogonal to the pivotal axis to overlap the cam drive shoulder 223 and it extends into an elongated arcular aperture 26 of the engaging member defined by a driven shoulder 27 with which the face 25 of the cam drive shoulder 23 mates with free movement, the arcular aperture may be further defined by a stop shoulder 28 angularly spaced from the driven 10 shoulder 27. The components are configured such that the cam can be rotated in an unlatching direction (to an unlatching configuration) to cause the drive shoulder 23 to engage the driven shoulder 27 to cause the engaging member to displace to the inoperative configuration, whereupon, the cam can be rotated in the opposite direction to an undisplaced disposition as the drive shoulder 23 moves freely 15 within the arcular aperture 26. The alternative engaging member can be displaced from the retracted disposition to the fully rotated configuration by rotation of the alternative cam (from the undisplaced configuration in the opposite direction) to a latching disposition. Further rotation of the alternative cam in the latching direction to a locking 20 disposition, (while the engaging member is stationery) locks the alternative engaging member to restrain the engaging member relative to the alternative casing . Supported by the alternative engaging member is the alternative clutch member that is displaceable between a first configuation in which it couples the 25 alternative engaging member and alternative cam to enable the alternative engaging member to be displaced by the alternative cam and a second configuration where it couples the alternative engaging member relative to the alternative casing to restrain the alternative engaging member from being rotated, the clutch member being displaced between confurations by relative angular 30 displacement between the alternative cam and alternative engaging member.

14 In some embodiments, there is within the alternative engaging member 206B a longitudinal aperture 229 having an axis parallel the pivotal axis that extends from surface 214 to comprise a through hole. Within this aperture 229, is an alternative clutch member comprising an axially elongated pin 231 that extends 5 from the surface of the alternative casing floor to protrude from surface 214 into the clearance recess 218 of depth k1 of the alternative cam. The parts are configured such that when the alternative cam is undisplaced and the alternative engaging member is retracted, the pin 231 abuts one of the angled planar connecting surfaces 219 to operably couple the alternative cam and 10 alternative engaging member. When the alternative cam is displaceded from the undisplaced disposition, (in a latching direction) the angled suface 219 of the cam acts on the pin 231 to cause it to displace simultaneously as the alternative cam, the pin simultaneously acting on its supporting aperture 229 to cause the alternative engaging member to displace sumultaneously as the pin. 15 When the alternative enagaging member is in the fully rotated configuration, it is restrained from further displacement by engaging a stop shoulder 32 of the alternative casing . At this configuration of the alternative engaging member, the longitudnal aperture 229 is axially aligned with a alternative casing floor longitudinal alternative casing recess 233 having a width sufficient 20 to accept the ball and preferably longiudinally elongated to accept a spring and second ball. As the alternative cam is further rotated from the latching to the locking configuration, the angled planar connecting surface 219 acts on the pin to displace it longitudinally towards the alternative casing floor so that it extends from the alternative cam surface 217 to extend from the lower side surface of the 25 engaging member into the alternative casing recess 233 to couple the alternative engaging member and alternative casing and hence restraining it relative to the alternative casing . Within the alternative casing recess 233 is preferably a ball 234 inwardly biased by a compression spring 235 towards the engaging member such that as 30 the alternative cam is rotated from the locking disposition (in an unlatching 15 direction) to bring the the alternative cam clearance recess 218 into alignment with the alternative casing recess 233, the ball acts on the pin to cause it to occupy the clearance recess 218 and when the alternative cam is further rotated, the pin becomes restained in the cam clearance recess 217 while abutting the alternative 5 casing floor. Further rotation of the alternative cam in an unlatching direction then brings the cam drive shoulder 23 into contact with the driven shoulder 27 described above. The cam can then be further rotated in an unlatching to cause the alternative engaging member to be displaced to the inoperative configuration, whereupon, the alternative cam can be rotated in the opposite direction to the 10 undisplaced disposition (as described above) as the drive shoulder 23 moves freely within the arcular aperture 26. When the alternative engaging member is in the fully rotated configuration, the alternative cam is in the latching configuration and the pin is in contact with the drive face 219A of the cam, the drive face is angled to present a wedge-like 15 feature to the end of the pin such that displacement of the drive face towards the pin causes the pin to slide up the wedge from the clearance recess 217 to abut the cam surface 217 to displace towards the alternative casing recess; the drive face exerting a vector force on the ball having a radial component in a direction parallel the axis of the side aperture. 20 In some embodiments, the lock comprises a second lock portion 1 having a key operable first barrel 2 comprising part of a first single cylinder and an opposed first lock portion 3 that includes the casing, the engaging member, ball and cam as described above or an alternative first lock portion 203 comprising the alternative casing, the alternative engaging member, pin and alternative cam 25 as described above. The material described below is applicable to both the first lock portion and second lock portion so for convenience, in the description that follows: "engaging member" will embrace the "alternative engaging member"; "cam" will embrace "alternative cam" and "first ball" will embrace "pin" 16 The barrel is operably coupled with free displacement to an axially extended shaft 36 supported coaxially with and disposed from the cam to which it is operably coupled. In some forms, where the shaft has a rectangular cross section it mates within an axially elongated recess 37 of the cam of rectangular 5 cross-section. The components are configured such that the cam can be displaced between the locked and unlatching configurations while the barrel remains stationery, the displacement of the shaft (and cam) being accommodated by the free displacement between the barrel and shaft which in some preferred embodiments comprises 90 degrees. 10 The key operable barrel 2 may have an axis of rotation that is coaxial with that of the cam or it may be inclined rearwardly from its point of contact with the shaft so that the opening in the barrel through which the key is received is further from the casing front edge 62 than the shaft. The barrel in either case, preferably has two opposed parallel spaced pin-like protrusions 38 disposed on opposite 15 sides of the barrel pivotal axis between which a T shaped end portion of the rectangular shaft locates to be angularly operably coupled (the T shape providing opposed tabs that protrude from the sides of the general shaft) In some embodiments, the first lock portion includes a hand operable angularly displaceable first operating member 39 of Figure 3 that preferably 20 comprises a first operating lever, supported coaxially with the engaging member to which it is directly connected and by which the engaging member can be displaced between the fully rotated and inoperative configurations when it is has not been locked by the first barrel. In some embodiments, the first operating member has inwardly prodtruding shoulders 40 that comprise opposed arcular fins 41 that 25 overlap the engaging member to locate within the opposed arcular apertures 42 of the engaging member as shown in Figure 13, that are on opposite sides of the pivotal axis of the engaging member. This embodiment may electively also include a second key operable barrel 43 comprising part of a second single cylinder (or thumbturn) that is operably connected with free displacement to the cam - the free 30 displacement between the cam and second barrel accommodating the cam being 17 displaced from the locked to the unlatching dispositions by the first barrel while the second barrel remains stationery. In some such embodiments as shown in Figures 13, 3 and 19 the outer end portion 44 of the cam includes an axial cylindrical barrel recess 45 having in its floor 46 a profiled substantially radially extending 5 driven shoulder 47 to mesh with an overlapping pin 48 protruding longitudinally from the inner end 49 of the second barrel 43 that has cylindrical end portion 50 (protruding from the cylinder casing) that mates within the barrel recess 45. (In the preferred embodiment of Figure 3, the pin 48 (when the barrel is undisplaced) lies in the same horizontal plane as the pivotal axis from which it is disposed). In this 10 configuration, the engaging member can be unlocked by the second barrel (and if the lock includes the first barrel, it may be unlocked by the first barrel). The engaging member once unlocked, can be displaced displaced between the fully rotated and the inoperative configuration by the first operating member (and if the lock includes the first barrel, it may be operated by the first barrel to displace 15 between the locked and inoperative configurations). In these embodiments, the second key operable barrel 40 may have an axis of rotation coaxial with that of the cam. In other embodiments as shown in Figure 4, the first lock portion excludes the second cylinder and includes a hand operable angularly displaceable second 20 operating member 51 supported coaxially with the cam to which it is directly connected and by which the engaging member can be displaced between the inoperative and the locked fully rotated configurations - the second operating arm 51 having an axial aperture 52 within which the cam drive shoulder mates and preferably without free movement. The second operating member has inwardly 25 protruding shoulders 53 that preferably comprise opposed arcular fins 54 that overlap the engaging member to locate within the opposed apertures 42 of the engaging member with free movement as shown in Figure 13. In this embodiment, the engaging member is displaced from the inoperative to the fully rotated configuration by operation of the second operating member that directly drives the 30 cam; once in the fully rotated configuration the cam and second operating member 18 can be further displaced to lock the engaging member while the shoulders 53 displace freely within the apertures 42. The engaging member is displaced from the fully rotated configuration to the undisplaced configuration by operation of the second operating member to cause the end wall portions 55 of the arcular fins 54 5 to act on the end walls 56 of the apertures 42 to cause the enaggaing member to displace with the second operating member (the cam being simultateouly displaced by the enagaging member but not contributing to this aspect of the functionality). The lock casing 57 comprises a hollow member that can support the 10 engaging member, ball and can electively support the second cylinder and either operating member. The lock casing preferably comprises the casing base 4 and a cover 58 comprising a hollow box-like member that is attached to the base and preferably it is shaped to include a handle portion to provide a means of hand operation. The base preferably has a pair of outwardly protrusing buttresses 59 at 15 each end of the casing base that are received by a mating cover apertures 60 at each end of the cover. Within each buttress and each end of the cover (commencing at the surface of the cover) is an orthoginal apertures 61 that extends through the buttress and cover, the aperture lying in a plane parallel that of the casing base and disposed orthogonally to the front edge 62 of the casing 20 base. A screw 63 is inserted within each aperture to connect the cover to the base. The cover preferably also includes attaching shoulders 64 that project to extend between each pair of buttresses, each of which includes an aperture 65 coaxial with an orthogonal aperture 61, this attaching shoulder providing improved 25 connection between the cover and casing base. Within the cover 58, there is a profiled recess 66 with a circular opening 67 to the surface through which the barrel head 69 of the second cylinder 68 barrel 43 protrudes or is accessible to enable a key to be inserted through a keyway opening in the barrel head. The profiled recess 66 and surrounding cover 30 are configured to restrain the cylinder housing 70 against rotation (by having side 19 wall portions) and fixed relative to the casing base. The cover is configured such that the cylinder end portion 50 is retained within the barrel recess 45 and the second cylinder outer housing wall 71 abutts the inside wall of the cover. The second lock portion 1 preferably comprises a handle 77 that can 5 support the first cylinder and shaft. It preferably includes a profiled recess 72 with a circular opening 73 to the surface through which the barrel head 74 of the first cylinder 75 barrel 2 protrudes or is accessible to enable a key to be inserted through a keyway opening in the barrel head 74. The profiled recess 72 and surrounding cover are configured to restrain the cylinder housing 76 against 10 rotation (by having side wall portions) and fixed relative to the handle. The handle includes an inner handle portion 79 with a circular aperture 78 through which the shaft has passage and through which the T portion of the shaft cannot pass. In usage, the inner handle portion is retained relative to the handle as described below with the T portion abutting an inside wall, the barrel abutting the T portion to 15 retain the barrel head 74 protrudes from the opening 73 - in this manner, the barrel supports the cylinder. The inner handle portion 79 my be retained by screws having passage through it enngaging in screw recesses in the handle or it may be retained by protruding into the profiled recess 72 while abutting the side of a door or wing to which the lock is attached. For convenience, the handle and cover 20 preferably always include openings for the heads of barrels and where a cylinder is not employed a plug is employed to cover the opening, this plug being supported by the opening and either the cam barrel recess or the inner handle portion. Within the casing floor 5, there are at each end a screw aperture 80 and directly opposite on the underside of the casing floor (preferably a substantially 25 planar surface) are preferably fixing bosses 81 compring raised annular shoulders that protrude to be received in circular apertures 82 in a side of the wing to which the lock is attached - the lock requiring three such circular apertures on each side to provide passage for the screws, shaft and fixing bosses. Preferably the outer apertures are 41 MM from the shaft aperture to comply with 30 an industry standard.

20 The handle 77 has elongated fixing bossses opposed to fixing bosses 81 to receive threaded screw shanks whereby to mesh with the screws in threaded engagement. In application, the casing base 5 and handle 77 are positioned one on each opposite side of a wing with each pair of fixing bosses axially aligned and 5 with the shaft 36 extending from the handle to be meshed within the cam rectangular recess 37 and the screws extend between the handle and casing base 4 to connect the two portions together with the wing between. In preferred embodments of the locks described above, within the arcular fin 12 of engaging member 6B is an auxiliary side recess 87 to receive the 10 second ball when the engaging member is in the inoperative configuration whereby to bias the cam from being displaced from the unlatching configuration and to bias the can towards the unlatching configuration when it is adjacently disposed to that configuration. In some forms of the inventions, the wing comprises a lock for a sliding 15 wing (including a door or a window), and the engaging member comprises a pivotal bolt 83 having a hooked portion 84 disposed from the pivotal axis and the fully rotated configuration comprises an extended configuration where the hooked portion 84 protrudes from the casing and the inoperative configuration comprises a retracted configuration in which the hooked portion is substantially 20 within the casing. In these embodiment there is a catch plate 85 having an engageable shoulder 86 behind which the hook portion (in usage, during latching) engages. The catch plate is attached to the closing edge of an opening towards which the wing displaces when it is closing. The hook portion 84, when engaged with the catch plate restraining the wing from being displaced in an opening 25 direction. In other embodiments the engaging member for a sliding wing may comprise a member having a sideways protruding shoulder that engages behind the wall of a slotted aperture. Where the lock comprises the lock for a sliding wing described above, the first lock portion comprises the interior portion and the second lock portion 30 comprises the exterior portion.

21 In some cases the closing edge of an opening is towards the left hand side while in others it is on the right hand side. For ease of use, it is preferable that the operating levers be displaced either upwardly or downwarly to effect latching (and preferably downwardly so that the weight of the second operating member does 5 not urge the lock unlocked) irrespective of the wing handing. To achieve this the lock is further configured as below and as shown in Figures 2 and 14 to 17. The casing base 4 of Figure 2 is adapted to include an opposed side recess 29A, and opposed ball 34A and spring and opposed stop shoulder 32A to enable the casing base to be inverted while remaining a mirror immage about a 10 horizontal plane. The engaging member comprises a substantially planar portion 6A and a disc-like portion 6B as shown in Fig 13, 18 and 19. The portion 6A includes a pair of apertures 88 designed to receive a pair of pinned protrusions 89 of the portion 6B; the pins and apertures lying in a horizontal plane when the engaging member 15 is in the fully rotated configuration and lying equidistant from the axis of rotation of the engaging member - this configuration enabling the enaging member to be disassembled, the second portion to be rotated 180 degrees, the first portion to be inverted about a horizontal plane and then re-assembled to the second portion. This rehanding process can be seen to have occurred when comparing Figures 18 20 and 19. One requirement that applies to both lefthand and right hand configurations, is that the drive shoulder 23 be upwardly and forwardly disposed in relation to the casing base front edge 62 when the engaging member is in the fully rotated and locked configurations and this requirement determines the angular 25 disposition of the planar connecting surfaces 19 relative to the drive shoulder 23. Another requirement is that the second drive pin 48 be adjacent to the driven shoulder 47 when the cam is in the locked configuration. The configurations of Figures 5 to 12, 14 and 15 and 18 have the barrel drive pin immediately above the driven shoulder while the oppositely handed configurations of Figure 19, 16 and 17 30 have barrel drive pin immediately below the driven when the lock is locked. The 22 derived cam has the drive shoulder 23 angularly disposed midway between the planar connecting surface 19 with the driven shoulder 47 orthogonally disposed to the drive shoulder 23. The engaging member first portion 6A is futher configured to include 5 apertures 42A to receive the arcular fins 41 and 54 when the lock is configured as in Figures 19, 16 and 17; these apertures being angarly disposed so that when employed with common operating members, the operating member un the inoperative configuration is at same angular disposotion relative to the casing irrespective of the handing - left or right handed. 10 The lock is preferably further configured to have multiple auxiliary side recesses 87 that are designated as 87n as shown in Figures 15 and 16, of which an upper and an opposed lower auxiliary recess are engaged by the balls 34 and 34 when the engaging member is in the inoperative configuration and a lower of which is engaged by either 34 or 34A when the engaging member is in the 15 operative configuration. The inventions within include multiple sliding door lock types that employ many common components and so can be said to include a sliding door lock series. In preferred embodiment the catch plate 85 comprises a substantially 20 planar base 87 (lying in a plane orthogonal to the plane of the casing floor) from which threaded shoulders 88 project towards the casing to support an engagable portion preferably comprising a U shaped member 89 (within a parallel plane disposed from the base 87) that has at its upper and ats its lower ends a vertically elongated aperture 90 to provide passage for a fastener 91 that is engaged within 25 the corresponding threaded shoulder. Between the shoulder 88 and the U shaped member around each screw is a spring to outwardly bias the U shaped member that (because of the elongagtion of the apertures 90) can be vertically displaced relative to the base 87 without requiring tools. At the upper and lower ends of the casing are aligning pins 92 having outwardly ramped end faces 93 and when the 30 casing and U shaped member are correctly aligned, the aligning pins abut the 23 upper and lower ends of the U shaped member by overlapping the U shaped member. The elongaged apertures are provided so that if the U shaped member is too low to be engaged correctly by the engaging member, then as the alignment pins approarch the U shaped member, the angled end face of the lower alignment 5 pin will contact the lower end of the U shaped member to cause it to slide up the angled face as the face slides towards the catch plate to dipslace it into correct alignment. A similar adjustment occurs if the U shaped member is too high. To accommodate both left hand and right handed sliding wings, the catch plate is a miror image about a horizontal plane having an engageable bridge 94 in the 10 middle and a clearance aperture above and below it to accommoadte free passage of the hooked end of the pivotal bolt. The catch plate preferably provides for alternative fixing methods by having an upper and a lower screw aperture 95 in the base 87 and an upper and a lower screw aperture 96 orthogonal to the base in end fixing portions 97. 15 In set of different embodiments comprising locks for a sliding door lock an exterior handle portion includes a first key operable barrel (having an axis of rotation coaxial with that of the engaging member) and an interior portion includes an angularly displaceable engaging member having a hook displaceable between an operative configuration and an inoperative configuration by operation of the first 20 barrel and by operation of an interior operating member comprising an extension (on the opposite side of its pivotal axis) to the engaging member configured as a lever. The interior assembly includes a substantially hollow casing that supports the angularly displaceable engaging member about a substantially horizontal axis 25 of rotation - the hooked portion being displaceable from a position substantially within the casing to a position where it protrudes from the casing, a disposition it would assume when engaged behind a portion of a catch plate. In some embodiment the lock includes an interior second barrel and an exterior first barrel and in which case the second barrel can be used to lock the 30 engaging member such that the second barrel or first barrel must be operated to 24 unlock the lock before the operating member can be operated to displace the engaging member. The barrel in the exterior assembly is operably coupled to the operating member by a shaft that passes through an aperture in the door. In these embodiments, the first lock portion has a raised handle portion 5 disposed away from the door edge by which the door is moved. The first lock portion includes an operating lever 102 to operate a "hooked" engaging member 103 and an angularly displaceable cam 104 member supported to have an axis of rotation coaxial with that of the engaging member. It is through the cam that the barrel or barrels operably connect to the engaging member - each barrel 10 comprising an angularly displaceable member comprisng part of a cylinder. The mechanism functions by allocating parts of the cam angular displacement to different functions. In a part of the range the operating member and cam move together, in a second range of cam movement, the operating member and engaging member remains stationery while the cam rotates - this 15 additional rotation being employed to fix the engaging member in relation to the casing. In these embodiments, the cam comprises a first cam member 104 comprising a disc-like member cam disc 105, supported adjacent to the base 4 of the casing and second cam member comprising a cylindrical shaft 107 portion 20 attached to a disc-like head 106. The shaft 107 extends through the engaging member and through a cylindrical aperture 109 within the first cam member 104 with which it mates with operating clearance to protrude through an aperture in the base 4 of the casing to be attached to the base by a circlip or other means. The cam disc 105 is coupled to the shaft through splined engagement so 25 they simultaneously displace - the splined engagement comprising a radially protruding shoulder of the shaft 107 mating within the recess 111 of the first cam member 104, said recess extending outwardly from the cylindrical wall of aperture 109 of the first cam member 104. Supported on the 'shaft 107 between the cam disc 104 and head 106 is the 30 engaging member.

25 The engaging member has an arcular portion 114 which extends to the casing base and which outwardly and inwardly comprises the arcs of a circle. Adjacent the engaging member and having a surface defined by a axis which is coaxial with the axis of rotation of the engaging member, is a raised arcular fin 5 115 extending from the casing base 4 to be adjacent the outer peripheral face of the arcular portion 114 such that the fin 115 always abuts the arcular portion 114. Within the arcular portion 144 there is a radial slot 116 which supports a ball 117 while permitting radial movement of the ball. This arcular portion 114 is configured to accept the ball to the extent that it is only partly received radially 10 within the slot 116, i.e. it must always protrude from the inner or outer radial surface of the arcular portion 114. The fin 115 has a radial recess 120 that supports a displaceable second ball 118 which is biassed towards the engaging member 103 by a spring 119. Coincidental with the engaging member being in the operative configuration 15 (and in contact with a stop shoulder comprising part of the casing to prevent further movement ), there is a slotted aperture 120 in the wall of the fin 115 adjacent the first ball 117 so that the first ball may be driven partly into this aperture in the fin to bind the engaging member to the fin to prevent it being rotated - by this means the bolt is locked. 20 The cam disc 105 has an outwardly ramped peripheral shoulder 121 within the contoured portion and coincidental with the engaging member being in the extended portion and the first ball being adjacent the aperture 120 while residing within the arcular portion 114 while in-part protruding radially inwardly from the arcular portion 114, the ramp 121 is adjacent the first ball so that rotation of the 25 cam disc 105 to displace the ramp 121 towards the first ball, forces the first ball into the slotted aperture 120. In this configuration, the cam disc outer peripheral face 123 is adjacent the inner peripheral face 124 of the arcular fin 115. During normal usage when the cam is caused to rotate by barrel operation, the cam and bolt engaging member are connected because the ball and ramp are 30 configured so that the ball is adjacent the fin to cause a portion of the ball to 26 protrude partly from the inner side of the slot to be adjacent the ramp ; the ball effectively being "stuck" between a peripheral edge of cam and the fin to restrain cam and engaging member connected so that operation of a key to rotate the cam simultaneously rotates the engaging member. When the ball becomes adjacent 5 the aperture 120 and the engaging member is restrained against further rotation, further rotation of the cam drives the ball into the aperture 120 As the cam is rotated in the opposite (the unlocking direction) from the locked configuration to the configuration where the finish of the ramp is adjacent the ball, the ball has is urged back into the cam disc peripheral recess 125 by the 10 spring to no longer engage the fin 115, at which point a drive shoulder 126 of the cam engages an outwardly protruding pin 127 of the bolt base. During further unlatching displacement of the cam, the pin and bolt are angularly displaced together while the first ball is retained between the fin and cam disc. In the different set of embodiments, when the second barrel is omitted the 15 engaging member can be locked from the exterior by the first barrel so that it cannot be unlatched by the operating member and in many applications this is an unsafe. In the similar lock described above Page 15 line 9 to 28, the lock can always be unlock by the operating lever. 20 25