AU2008200924A8 - Improvements in locks - Google Patents

Description

1 5 Title: Improvements in Locks 10 Summary of the Invention According to one aspect of the invention, there is a lock for a moveable wing defined by an interior and an exterior side, the lock including an engageable means, a casing mountable relative to the interior side, engaging means including at least one engaging arm supported relative to the casing each said engaging arm 15 displaceable to an operative configuration to be engageable with the engageable means to restrain the wing from displacing in an opening direction, operating means to cause each engaging member to displace to and from the operative configuration including a hand operable interior-operating member operably connected by slide means to each engaging member, said slide means comprising at least one 20 displaceable slide and characterised by an operative configuration corresponding to each engaging member being in the operative configuration, the operating means further including a cylinder having a key operable barrel operably connected to the slide means by an angularly displaceable first member, the slide means and each engaging member being displaceable to and from their respective operative 25 configurations by operation of the interior-operating member and by operation of the cylinder, the barrel characterized by a pivotal axis that intersects the pivotal axis the first member. In a second aspect of the invention, the pivotal axis of the barrel is coaxial with the pivotal axis the first member. 30 In a third aspect of the invention, the lock is configurable by the cylinder to a first locked configuration in which the slide means is in the operative configuration and unable to be displaced from that configuration by the interior-operating member. In a fourth aspect of the invention, a slide includes and supports a relatively displaceable sub-slide, said sub-slide being displaceable within the slide between 2 limits comprising an undisplaced position towards which it is biased, and a fully displaced locking disposition that corresponds to the first locked configuration. In a fifth aspect of the invention, a slide includes a drive recess and the first member comprises a first pinion having a protruding third drive shoulder radially 5 disposed from the axis of rotation of the first pinion, the slides being displaceable to and from the operative configuration by the interior-operating member when the third shoulder is within the drive recess. In a sixth aspect of the invention, the first locked configuration is characterized by the third shoulder having been displaced to leave the drive recess. 10 In a seventh aspect of the invention, there is an angularly displaceable rocker member having at least one radially disposed arm and wherein the interior-operating member comprises an angularly displaceable member that is connected coaxially to the rocker, the at least one arm of said rocker being connected to the at least one engaging means by the at least one slide. 15 In an eighth aspect of the invention, there is a control means to restrain each engaging member from being displaced to the operative configuration unless the engageable means and wing are substantially adjacent, said control means including an outwardly biased plunger supported in the casing to be displaceable from a fully extended position in which it simultaneously protrudes from the casing while 20 engaging a slide to restrain the slide means from displacing. In a ninth aspect of the invention, there is a wing assembly including a lock. According to another aspect of the invention, there is a lock substantially as described herein with reference to and as illustrated in the accompanying figures. The elements relating to the various aspects of the invention claimed within 25 are identified within the specification as follows: where unless the context requires otherwise, a "Locks" or variations such as "lock" will be understood to include complete locks for and improvements in locks for wings that are transportable into other devices without being limited to the complete locks described herein. 30 * "Comprise" or variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers, * Positional prepositions such as "rear" and "forward" are used to assist in description of the preferred embodiments and with reference to the 35 accompanying drawings and have in general, no absolute significance, 3 * "Overlap" and derivations such as "overlaps" implies at least in-part, occupying a same plane as. * "Meshes with" implies being engaged with - for example, an angularly displaceable shaft meshing with a recess in an angularly displaceable pinion so 5 as to angularly displace together; this not precluding the shaft displacing longitudinally to and from the recess, * "Extent" will be understood to embrace area, form and shape. * Headings are included for convenience only and not to affect on interpretation. 10 * "Preferably" or variations such as "prefer" does not imply that the form of an integer is restricted to that referred to as preferred, but implies adequate and if need be, able to adequately perform a function required by the invention * "Wing" or variations such as "wings" includes complete wings and improvements in wings without being limited to those described herein and more 15 particularly, wings embraces wings configured as "doors", "windows", "shutters", "screens", * "Structure" or variations such as "structures" implies a man-made fabrications consisting of one or more members and embraces complete structures and improvements in structures without being limited to the forms 20 described herein, structures more particularly embracing wings and wings configured as doors or window screens, * "Member" is an identifiable entity having material form that may include one or more identifiable components, * "Material" includes elements, alloys, plastics and other substances. 25 - "Aperture" and "recess" embrace a hole that extends from a surface while "aperture" in some contexts more particularly implies a hole that extends between surfaces. * "Furniture" includes door furniture that includes a "handle assembly" that includes a handle supported by a base that together in one form comprise a 30 disengaging handle supported by a back-plate or base: e "Handle" includes a knob and lever; * "Disengaging Handle" includes a lever or knob that is hand operable to cause an engaging member to become disengaged and/or retracted * "Base" includes a Rose that may include a surface mounted member 4 having a recess on the underside and it includes a back plate, 0 "Back Plate" (or "back-plate") includes a surface mounted box-like member having a recess on the underside. e "Engaging Member" is a member displaceable to and from an operative 5 configuration, a configuration the engaging member assumes when participating in engagement with an engageable means and a configuration where the engaging member is at least substantially fully displaced; within this specification, and for ease of description with respect to the engaging member, fully displaced embraces operative. 10 * "Latching" implies displacement of an "engaging member" into engagement with an "engageable member under the action of biasing means. * "To engage" implies displacement of an "engaging member" into engagement with an "engageable member". * "To disengage" means to withdraw from engagement or withdrawal 15 from the operative disposition to an inoperative disposition removed from the said engagement. Within this specification, and for ease of description, with respect to the engaging members, retracted configuration embraces inoperative configuration, * "Latch-Bolt* or "latch bolt" is an outwardly biased bolt capable of executing 20 (or participating in) latching and includes bolts having a leading end that is chamfered or otherwise profiled on one or both sides. " "Auxiliary bolt" is a plunger that is operably associated with a latch bolt. " "Unlatching" means withdrawal of the engaging member from engagement. " "Locking" means the act of configuring the lock to restrain it from 25 being disengaged and in some forms of locks employing deadlocking slides, it means restraining the deadlocking slide to restrain the bolt from being inwardly displaced in response to operation of the disengaging lever. * "French Door" means a door including a frame and a glass in-fill. * "Screen door" means a door including a frame and an insect restraining 30 in-fill such as fiberglass mesh, woven mesh or perforated metal mesh; & "Lock Body" includes an engaging member and a lock casing and an Australian conventional security door lock includes a lock body that is able to fit within an industry-standard door preparation having a recess depth 48 MM, a recess width 16 MM and an opening length 160 MM 5 " "Mortise Lock" means a lock including a lock body, a strike plate, a pair of handle assemblies and a cylinder where the lock body is configured to be fitted within the frame of the structure. - "Single cylinder" means a substantially conventional lock cylinder 5 comprising a separate sub-assembly that includes a key operable barrel within a cylinder housing. * "Double-Cylinder" comprises a substantially conventional double lock cylinder being a separate sub-assembly that includes opposed coaxially supported-barrels each operably connected to the same angularly displaceable 10 "first cam" having a "first cam arm" characterized by a "free end" that extends radially to a "peripheral surface" defined in part by a common radial distance from the first cam pivotal axis and where in a conventional double cylinder this radial distance is 15.0 MM. * "Cross-Sectional View" in relation to figures should be interpreted as an 15 orthogonal cross-sectional view defined by a plain orthogonal to the longitudinal axis of the member in consideration. * Patent Specification implies inclusion of: a Body including a Title, a * Description of Preferred Embodiment/s, an Abstract and a Summary of the Invention] and a specification will include Claims. 20 Unless the context requires otherwise, any prior publications and usage referred to herein, is not an assertion that any of this material forms part of the common general knowledge in the art in any other country at the priority date of any claim herein (or the priority date of any future claimed derived at least in part from this specification). 25 The integers described within include those related to the various aspects of the invention claimed within and they include those related to the various aspects of other inventions to be claimed in future divisional applications and continuations in part. Where an integer is attributed with attributes different from those attributed in 30 an earlier application on which this application relies for priority, the integer will be considered to be the same integer in a different form; where there is actual inconsistency, the latest description will prevail 8 Description of the Drawings Notwithstanding any other forms that may fall within its scope, one preferred form of the invention will now be described by way of example only with reference to the accompanying drawings in which: 5 Figure 1 is a perspective view of the lock and wing when viewed from the interior of the wing; Figure 2 is a perspective view of the lock and wing when viewed from the exterior of the wing; Figure 3 is a perspective view of the lock without the wing; 10 Figure 4 is a perspective view of the interior lock portion of the manual lock with the lid removed; Figure 5 is an exploded perspective view of the interior lock portion of Fig 4: Figure 6 is an exploded perspective view of the interior lock portion of Fig 4; Figure 7 is a schematic, partial side view of the sub-slide and first pinion 15 when the sub-slide is relatively undisplaced; Figure 8 is a schematic, partial side view of the sub-slide and first pinion when the sub-slide is fully displaced and the third drive shoulder abuts the exit shoulder; Figure 9 is a perspective, partially exploded partial view of the pinions, first 20 spindle and cylinders; Figure 10 is a perspective view of the interior casing, lid and handle, (having an alternative form but incorporating the features being described in relation to that figure) when viewed from the interior side; Figure I I is a perspective view of the exterior handle of the manual lock; 25 Figure 12 is a perspective, exploded view of the catch plate, when viewed from the interior and rear; Figure 13 is an isometric view showing a spacer. Detailed Description of Embodiments Consistent with Concepts of the Inventions 30 Some of the inventions described within derive, at least in part, from those described in AU 51891/01 which is hereby included in this application by reference. Some of the inventions described within distinguished from some inventions described in AU 51891101 by having casings of lesser width and one or more cylinders not offset relative to the spindle 35.

7 The inventions described within, include an improved lock where each engaging member is moved between an extended and operative position and a retracted and disengaged position by manipulation of a key or hand operable operating member. The inventions described within may be adapted as described in 5 AU 51891/01 to become self-latching where each member is moved to the extended position by biasing means and moveable to the retracted position by manipulation of an operating member. The inventions described within, include an improved lock that can be represented as below: WITHIN INTERIOR ASSEMBLY 10 Interior cylinder 718 [coupled with free movement with] first pinion 36 BETWEEN ASSEMBLIES [coupled without free movement with] 15 first spindle 35 [coupled with free movement with] WITHIN EXTERIOR ASSEMBLY T Shaped end 38 of the first spindle [coupled with free movement with] 20 exterior cylinder 12/13 Some of the inventions described within this application include a first pinion 36 having a form of that in effect, combines the first pinion and second pinion of the lock described in AU 51891/01 and some of the inventions described within this application include a T shaped end 38 having a form that in effect, combines the T 25 shaped end 38 and offset pinion described in AU 51891/01; some integers are as described in AU 51891/01 and some are generally described in AU 51891101 but are adapted to take a form consistent with the inventions described in this application and in particular they adapted to be consistent with the form the first pinion alternative T shaped end take,. 30 The inventions described within include a lock having an interior assembly I for mounting to the interior surface 2 of a wing, an interior casing 3 supporting one and in some forms, two engaging members: an upper engaging member 4 and a lower engaging member 5, and in some forms, a hand operable operating member 6 and an engageable means that in some forms comprises a catch plate 9 35 engageable by the engaging members 4 and 5; in other embodiments, the 8 engageable means comprising adaption of the element 10 comprising part of the opening to provide engageable shoulders. The lock further includes an exterior assembly 11, which includes an exterior casing 72 and an exterior cylinder 12 having a key operable barrel 13, 5 and an exterior handle 14 by which the wing can be displaced is attached to an exterior face of the wing. The lock described above is mountable to a displaceable wing suspended adjacent to an opening such that when the lock body and engageable means are engaged with each other, the wing is restrained from being moved in an opening 10 direction; the wing in some cases comprising a substantially hollow frame characterized by a hollow portion 120 and an in-fill retaining portion 121 supporting an in-fill material such as glass or expanded mesh. The interior assembly includes a handle 15 (by which the wing can be displaced) that in some forms comprises a D-shaped handle (shown in parent and 15 Fig 10) while in other forms comprising a substantially elongated box-like hollow member having a rectangular footprint. The interior casing 3 is defined by a front wall 16 disposed towards the catch plate 9, an opposed rear wall 17 an outer side comprising a casing lid 18, shown in Fig 10, to which the handle 15 is integrally connected, an opposed underside 19 adjacent to the interior surface 2 of the frame, 20 an upper wall 20 and a lower wall 21.-The interior assembly further includes one and preferably the pair of engaging members, an upper and a lower engaging member 4, 5 respectively, each having a free end 22 with each free end having an engaging element that in some forms comprises a hooked portion 23 but in other embodiments comprises sideways protruding shoulders. Each engaging member 25 has an opposite supported end 24 supported in the casing at a pivotal axis 25 defined by a substantially cylindrical shaft preferably comprising a metal rivet 26, which has passage through, to be supported by, an aperture 27 in the casing, as shown in Fig 5; the rivet being coaxial with the axis of rotation of the engaging member and preferably disposed substantially orthogonally to the surface of the 30 wing. Each engaging member has a slotted recess 28 adjacent to but radially disposed from the pivotal axis 25 which in a first part 29 is substantially radial to the axis of rotation and in a second part 30, (which may be curved), has an operating portion which is inclined to the vertical when the engaging member is retracted, undisplaced and which is substantially vertically disposed when the engaging 35 member is extended.

9 Some forms of the lock only requires three through apertures in the wing, a central aperture to provide passage for a first-spindle 35 (Fig 3) to operably connect the exterior cylinder 12 to the interior assembly I and spaced apertures to provide passage for fixing screws whereby an upper fixing screw 93, shown in Fig 10, has 5 clearance passage through an upper aperture 221 in the interior casing 3, through an upper aperture 220 in the wing to engage in an upper threaded recess 222 in the exterior casing and a lower fixing screw 93 has clearance passage through a lower aperture 231 in the interior casing and lower aperture 230 in the wing to engage in a lower threaded recess 232 in the exterior casing. In some forms, the 10 fixing screws and apertures are spaced to comply with an industry standard in Australia, being approximately 82 mm. In some forms, the apertures are surrounded coaxially by bosses whereby aperture 220 in the wing accommodates bosses 31 and 32 being extensions of the interior and exterior casings respectively, and the lower aperture 230 in the wing 15 accommodates bosses 33 and 34 being extensions of the interior and exterior casings respectively. The fixing screws 93 and have clearance passage through the upper aperture 221 in the interior boss and upper aperture 220 in the wing to engage in an upper threaded recess 222 in the exterior boss and fixing screws have clearance passage through a lower aperture 231 in the interior bosses lower 20 aperture 230 in the wing and wing to pass through the wing to engage in a lower threaded recess 232 in the exterior bosses. In some forms, the fixing screws, apertures and bosses described above are spaced to comply with industry standard spacings in New Zealand, being approximately 125 mm. In other forms, the fixing screws, apertures with bosses described 25 immediately above are configured for Australia, but additionally there may be additional apertures not surrounded by a boss, wherein there is an upper aperture 225 in the interior casing 3, an alternative upper aperture 220A in the wing and an upper threaded recess 222A in the exterior casing; and additionally there is a lower aperture 235 in the interior casing 3, an alternative lower aperture 230A in the wing 30 and a lower threaded recess 232A in the exterior casing, these apertures having different spacings and in a particular form, spaced to suit New Zealand. A interior spacer 240 having a protruding upper boss 131 and a lower boss 133 are received in the apertures 220A and 230A in the wing configured to have different spacings and in a particular form, spaced to suit New Zealand, the 35 interior spacer additionally having recesses 228 and 238 configured to receive the 10 bosses 31 and 33 respectively. Similarly an optional exterior spacer may be included having recesses 228 and 328 to receive the bosses 32 and 34, this spacer member having a protruding upper bosses and a lower boss that are received in the apertures 220A and 230A in the wing and having associated tapped apertures to 5 receive the fixing screws; these spacers enabling the lock that has been configured for one region, for example Australia, to be fitted immediately to wings having apertures spaced differently and in a particular, to suit wings having apertures spaced to suit NZ. In some forms, an interior barrel 8 of an interior locking cylinder 7 is 10 supported coaxially and adjacent to a first pinion 36 to be coupled with free movement to the first pinion 36 by at least one (and preferably two opposed) longitudinal protruding drive shoulders of the interior barrel spaced from the pivotal axis of the barrel that extend into kidney shaped recesses in the outer surface of the first pinion (Fig 4, with free space peripherally but only working clearances radially); 15 the first cam having a cylindrical end portion 37 that extends into a circular aperture 39 in the interior casing underside 19 to be angularly displaceable about an axis of rotation orthogonal to the surface of the wing, in some forms the end portion protrudes from the aperture to receive a circlip 40 . The first pinion has on the underside, as shown in Fig 6, a slotted recess 52 in which the first-spindle 35 20 engages without significant free movement - preferably in splined engagement to accommodate a variety of distances between the interior and exterior assemblies. As shown in Fig 9, the first pinion 36 is coupled to the exterior barrel 13 by a T shaped end 38 on the first spindle 35 that extends sideways to overlap opposed barrel pins 42 described below with which it is coupled with free movement by the 25 opposed longitudinal protruding drive shoulders 42 of the exterior barrel that are each spaced from the pivotal axis of the barrels In some forms, the axis of rotation of the barrel 13 is orthogonal to the surface of the wing, in other forms it is slightly inclided to dispose the keyway opening further from the catch plate to provide more finger room for key operation. The T shaped end 38 is retained so disposed by being 30 within a cylindrical recess 75 within a substantially hollow cup member 76 supported in the underside of the exterior casing 72. The first pinion 36 and first-spindle 35 comprise a directly coupled angularly displaceable "first transmission train" that is coupled with free movement to a "second transmission train" comprising the exterior barrel. The first transmission train 35 is characterized by an "undisplaced configuration" corresponding to retracted 11 engaging members and an "operative configuration" corresponding to extended engaging members and a "first looking configuration" also corresponding to extended engaging members. This will be explained below. In some forms, diagonally opposed barrel pins 42 protrude longitudinally from the interior barrel 8 internal end to locate 5 in respective arcular recesses 43 in the first pinion said recesses being defined by substantially radial shoulders 44 which are engageable by the respective barrel pins 42. The barrel 8 in the interior cylinder 7 can be rotated from an 'undisplased position" defined as the key removal position, to cause the first transmission train to 10 rotate between configurations and then be returned to the barrel undisplaced configuration because of the free movement. The exterior barrel 13 and the adjacent T shaped end 38 are configured such that the key can be inserted in the exterior barrel when the barrel is undisplaced, the key and barrel rotated to operate the first transmission train from the undisplaced 15 configuration to the operative configuration and then the key turned a further small amount to lock the lock to the first locked configuration by displacing the sub-slide. The exterior key can then be reversed to the undisplaced barrel position to enable the key to be removed, while leaving the transmission train in the locking configuration. The free movement between the first-pinion 36 and recess barrel 8 20 and between the T shaped end 38 and exterior barrel 13 are further configured such that if the first transmission train is undisplaced then any movement of the second transmission train towards the operative configuration immediately causes the first transmission train to commence displacing, and if the first transmission train is in the first locking configuration then any movement of the second transmission in an 25 unlocking/disengaging direction immediately causes the first transmission train to commence displacing towards the undisplaced configuration. Supported within the interior casing, as shown in Fig 4, are two rectilinearly vertically displaceable counteracting slides; an upper slide 45 operably connected to an upper engaging member and a lower slide 46 operably connected to a lower 30 engaging member between which there is an angularly displaceable rocker 47 by which the two slides are coupled so that each displaces equally and simultaneously but in the opposite direction. These slide are supported with working clearances between the inside surface of the front waill16 and the shoulders 90 surrounding the apertures 92 and between the inside surface 41 of the base and the engaging 35 members. The slides may additionally be supported by vertically elongated finned 12 portions 200 of the casing. The rocker 47 has in relation to its axis of rotation, diagonally opposite arms, a forward protruding rocker arm 48 which straddle the lower slide 46 and a rearward protruding rocker arm 49 which straddles the upper slide 45, the arms being coupled to the respective adjacent slide by a sideways 5 protruding rocker pins 50 which locate in horizontally elongated slide slot 51 in the respective slide - the protrusions preferably comprising cylindrical protrusions having a longitudinal axis parallel with that of the rocker and barrels. The interior-operating member 6 is connected to the rocker 47 by a shaft that meshes, (i.e. engages without free movement), in the axial rocker recess 89 - the shaft preferably being 10 an extension of a shaft portion of the interior-operating member. The upper slide 45, supports relative to its outer surface, a relatively moveable spring biased sub-slide 53 that is biased towards an undisplaced position relative to the upper slide by a spring 54. The sub-slide has upper and lower extensions 55, 56 respectively, which locate in slotted recesses 58, 57 15 respectively in the upper side of the upper slide and by which the sub-slide is supported adjacent to the underside of the first pinion 36 as shown in Fig 4. In the upper side of the sub-slide disposed towards the first pinion is a cam recess 59 defined by an upper or first drive shoulder 60 and a lower or second drive shoulder 61 between which a third shoulder 63 of the first pinion locates to 20 couple the upper slide and first pinion; and by means of rocker 47 the lower slide as well. In a alternative forms, the upper shoulder comprises part of the upper slide, and the lower drive shoulder comprises part of an alternative sub-slide that is relatively displaceable against spring biasing. Because of the coupling, the upper slide, from a nominal undisplaced position 25 corresponding to retracted engaging members, can be displaced by cylinder (or interior-operating member) operation to a position corresponding to the operative configuration with extended and deadlocked engaging members. While unlocked, the first transmission train, ('first train"), can be angularly displaced to cause the upper slide, to cause the rocker 47 to cause the lower slide to displace and to cause the 30 interior operating lever to correspondingly rotate; and the interior-operating lever can be angularly displaced to cause the rocker to rotate to cause the upper slide and lower slide to displace and to cause the first train to correspondingly rotate - so the first train is moveable in either angular direction, towards and from the operative configuration by either a key or the interior-operating lever.

13 When the lock is in the operative configuration, as shown in Fig 4, the first train can be further displaced in a locking direction to displace the sub-slide relative to the upper slide (against biasing derived from compression spring 54) while the upper slide remains substantially unmoved, to lock the lock into the first locked 5 configuration - this can be done by turning the key in either cylinder. In some forms the sub-slide 53 can only be displaced against the spring a pre-determined distance relative to the upper slide, this distance being defined by a shoulder portion adjacent to the recess 57 that acts as a sub-slide stop. Configured such that only when the upper slide is fully displaced downwardly to the operative 10 configuration and the sub-slide has been displaced to be adjacent to the sub-slide stop can the shoulder 63 be rotated to depart from the recess 59 between the drive shoulders 60 and 61. In some forms the spring is replaced by a solid member and the sub-slide cannot be displaced - in this case, the lock is always operable by the interior operating member. 15 in this locked configuration, there is no operable coupling between the first train and the interior-operating member cannot be rotated to cause the upper slide to rotate to cause the rocker and first pinion 36 to rotate. In this locked configuration the upper slide is rendered immovable by shoulder 63 having been displaced from between the drive shoulders 60 and 61 to slide over an arcular exit shoulder 62 of 20 the sub-slide the surface of which then lies substantially orthogonal to the pivotal axis of the first pinion (Fig 8), In this configuration a leading edge 64 of the shoulder 63 comprising an arcular edge, (with respect to the axis of rotation of the first pinion), abuts the exit shoulder having been displaced from between the drive shoulders to slide over the exit shoulder 62 without moving the support slide. Attempted 25 displacement of the upper slide upwardly causes the sub-slide to be urged upwardly to cause the surface of the exit shoulder to exert a force on the shoulder 63 which is defined by a vector passing through the pivotal axis of the first pinion without giving rise to a moment on the first pinion. The upper slide 45, as shown in Fig 4, extends from the rocker 47 to connect 30 to the upper engaging member 4; the lower slide 46 extends from the rocker 47 to connect to the lower engaging member 5. Each slides has a sideways protruding slide pin 65 that locates in a slotted recess 28 in the associated engaging member the pin and slotted recess being coupled in cam-follower relationship. As each slide pin displaces the associated engaging arm to the extended 35 position, it slides within the first part 29 in a manner defined by a slide-follower 14 relationship. When the engaging members are in the fully extended positions, (in a preferred embodiment disposed 90 degrees to the side of the interior casing), the slide pin displaces further to deadlock the engaging member in which position the slide pin abuts the operative portion of the second part 30 of the slotted recess which 5 is then vertically disposed. The significance of the operative portion being vertical when the engaging members are extended is that attempted rotation of the engaging arm from the extended position causes the recess 30 wall to exert a horizontal force on the slide pin which is resisted by a wall of the interior casing and rotation of the engaging member is prevented, the arrangement in effect separately deadlocking the 10 engaging member. In a preferred embodiment the engaging members, have drive portions 66 mirror images about a horizontal line through the first pinion, these portions including the recesses 28. Preferably, the interior assembly includes a detent including an inwardly 15 displaceable elongated plunger 67, as shown in Fig 4 to 6, supported by a hollow cover and biased a by spring 70 which abuts an end wall 77 of a spring recess within the plunger and which also abuts and end wall 78 of a hollow cover member 79, as shown in Fig 5 that includes a horizontally elongated recess 80 within which the plunger is supported. The plunger has a side protruding shoulder 68, which can 20 locate under and outwardly disposed shoulder 69 in the upper slide to restrain the upper slide from displacing downwardly from the position corresponding to retracted engaging members. The lock is configured such that when the upper and lower slides are undisplaced, i.e. the engaging members are retracted, the plunger protrudes from the interior casing while the shoulder 68 is beneath shoulder recess 25 69 restraining the upper slide and therefore restraining the directly coupled further mechanism from being displaced from the undisplaced configuration. Depression of the plunger, through engagement with the catch plate as the wing is closed causes displacement of the shoulder 68 from the shoulder 69 enabling the slides to be displaced. 30 The engaging members are configured so that they move simultaneously in opposite directions and in the direction of the hooks. In a preferred embodiment they move towards each other and the hooked portions move towards each other to be engageable behind shoulders of the catch plate. The exterior second assembly, as shown in Fig 9 and 11, preferably 35 comprises a hollow shaped exterior casing 72 of which the exterior handle 73 is an 15 integral part as are the fixing bosses 32 and 34 are configured as extensions of casing 72; the casing 72 is further configured to include aperture 81 into which the head of barrel 13 protrudes to be accessible. Supported within the hollow portion is the cupped shaped cover 5 member 76 in whose axial recess 75 is supported the T shaped end 38 of the first spindle 35. This cover member 76 also acts to retain the exterior cylinder within a mating shouldered cylinder recess within the hollow, the cylinder recess in some forms defined in part by an axis orthogonal the face of the wing, in other forms it is inclined generally away from the catch plate to provide more room to operate the 10 key. The interior lock, as shown in Fig 10, preferably comprises a hollow lid portion 18 having an upper and a lower inwardly protruding boss 91 each locating in a shouldered recesses 92 in the interior casing 3 that in some forms are located substantially co-axially with the fixing screws 93. The shouldered recess 92 and the 15 boss 91 are together intersected by a transverse recess 94 through which a transverse screw 95 has passage to fasten the boss 91 within the recesses 92 by which it is preferably surrounded. When the wing is closed these screws 95 is inaccessible. The boss 91 preferably comprises a horizontally elongated protruding oval blade. 20 Preferably the handle 15 comprises an outer portion generally hollow in form and to which handle back 98 which is attached by screws 99 to the outer portion. Where either cylinder is omitted, exteriorly or interiorly, a plug is preferably employed to occupy the cylinder space: to protect the associated pinion from tampering, to support the pinion, and to improve the appearance which otherwise would be 25 compromised by a visible aperture. Supported between the first pinion and the lid portion within a cylinder recess in the lid portion 18, is the exterior cylinder 12. The cylinder recess connects to a barrel aperture 97 in the wall of the lid through which the head of the interior barrel 8 protrudes to be accessible. Each slide in some forms, is biased by a compressed compression spring 30 150, as shown in Fig 4, held compressed by being retained between the end 152 of the slide and a shoulder 151 of the case 3. In some forms, the spring 100 is supported about a follower 153 having at one end a return 154 that is within an aperture 156 in the side of the slide while the other end extends through a slotted aperture 157 of the shoulder 101. Adjacent to return 104 follower 103 has a 35 shoulder 158 and the spring is supported between this shoulder 108 and the 16 shoulder 101. The mechanism is configured such that when the slide is half way between its undisplaced and fully displaced configurations, the follower 103 is substantially orthogonal to the locus of movement of the slide, this mechanism acting to urge the slide towards its extreme outwardly disposed or inwardly disposed limits 5 of displacement; in so doing, acting as an over-centre device. Each slide is preferably so biased. The catch plate 9, as shown in Fig 12, has a forward wall 101 disposed towards the front edge of the interior assembly with openings 102, as shown in Fig 3, to provide passage for the engaging members to recesses 103 into which the 10 hooked portion of the engaging arm extends. The catch plate preferably comprises a vertically elongated catch casing 104 which supports a forward wal comprising a separate channel 105, restrained relative to the casing by two spaced springs 173 located between the catch casing and channel. There are two spaced vertically elongated apertures 106 in the channel'through which headed fasteners preferably 15 comprising screws 107 have passage to attach the channel to the catch casing by engaging in threaded apertures 108 in the catch casing. Screws 107 are adjustable in and out to selectively set the distance between the channel and catch casing as is required and to accommodate small deviations in the wing 2 and element 10. 20 The catch casing can be attached to the element defining the wing opening in two different ways: screws 109, including the head can be passed through apertures 110 in the channel to be inserted in vertically elongated first fixing apertures 111 in the catch casing to be fastened to the element 10 - the catch plate being vertically adjustable because of the elongation of the fixing recesses. Alternatively, screws 112 25 may be passed from the outer face of the catch casing through vertically elongated second fixing apertures 113 in the catch casing to be fastened into element 10 - the catch plate again being vertically adjusted because of the elongation of the fixing recesses. After fixing, plugs 114 are inserted within the second fixing apertures. Each 30 second fixing aperture is intersected by transverse apertures 115 commencing at the front edge of the catch casing and support a grub screw 116 which threadedly engage the walls of the recesses. After the insertion of each plug the grub screw is tightened to bite into the plug to retain the plug in the second fixing recesses to render the screw 112 inaccessible.

17 At each end of the channel is an end shoulder 117 overhanging the recesses 103 to provide in-part a forward wall of the recess 103 and by so doing providing a counter-levered engageable shoulder behind which the hooked portions 23 of the engaging member can locate so that the hooked portion cannot be withdrawn 5 horizontally from behind the shoulder 117 - this action corresponding to attempted forced entry. Preferably the channel comprises an elongated steel channel or a single zinc diecast member. Preferably the casing comprises a single casting to provide increased strength. Preferably the casting comprises a substantially elongated first 10 plate-like portion 118 integrally attached at right angles to another substantially second elongated plate-like portion 119 (corresponding in this embodiment to the base of the casing), each providing for the other a web-like portion to resist bending of the catch casing. As well as adjustment through elongation of the fixing holes, further 15 adjustment is provided through elongation of the apertures 106 whereby the channel is vertically adjustable up and down from a nominal central position relative to the catch casing. So as the engaging members move to the extended position one of them would contact a shoulder 117 of a misaligned channel and move the channel to be vertically aligned with the engaging members. The springs 173 then maintain the 20 channel relative to the catch casing Configurations embraced by the inventions described within and which will be commonly employed (but to which this invention are not limited) are as described below * An interior and exterior cylinder without an operating member, each being 25 operable to displace the lock to and from the operative configuration and each being key operable to lock:and unlock from the first locked configuration. * A single, exterior cylinder and operating member, each being operable to displace the lock to and from the operative configuration, the cylinder also 30 being key operable to lock and unlock from the first locked configuration. * An operating member and no cylinders, the member being operable to displace the lock to and from the operative configuration.

18 * A single, interior cylinder, the cylinder being key operable to displace the look to and from the operative configuration and to lock and unlock the lock from the first locked configuration. 5