AU1529500A

AU1529500A - Improvements in locks

Info

Publication number: AU1529500A
Application number: AU15295/00A
Authority: AU
Inventors: John Russell Watts
Original assignee: Yarra Ridge Pty Ltd
Current assignee: Yarra Ridge Pty Ltd
Priority date: 1999-02-10
Filing date: 2000-02-10
Publication date: 2000-08-17

Description

P/00/01i1 2815191 Regulation 3.2

AUSTRAUJA

Pate nts Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Invention Title: 11 1,f .The following statement is a full description of this invention, including the best *method of performing it known to me:- S S. Title: Improvements in Locks Summary on Invention: According to the invention there is provided a lock lockable exteriorly by a first hand operable member but not unlockable by the said first hand opeable member A lock including_a key operable cylinder having a rotatable armed cam and a deadlocking slide wherein the deadlocking slide is moveable by key operation to effect a locking function, said arm of the cylinder cam locating between shoulders of the deadlocking slide to thereby define therebetween a cam recess, one of the said shoulders comprising part of a slide member supported by the deaddlocking slide and maintained within a range of limited movement and spring biassed so that its associated shoulder is urged towards a cam within the cam recess.

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50 -o 104 si' \NT OK Also according to the invention there is provided a lock substantially as described herein with reference to and as illustrated in the accompanying drawings.

Drawings 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 a schematic partial side view of a lock body, Figure 2 is a schematic partial side view of another embodiment of the lock body, Figure 3 is an isometric partial view of the underside of an exterior handle Figure 4 is a schematic view of the locking means with the locking slide in an undisplaced position Figure 5 is a schematic view of the locking means in a second locked configuration, Figure 6 is a schematic view of the locking means in a first locked configuration.

Description of the Preferred Embodiments In a preferred embodiment the lock_comprises operable handle sets mountable on the face of the door, the interior and the exterior, a lock body including an engaging member mountable within the door and an engageable means comprising a catch plate mounted to an element comprising part of the door opening and engageable by the engaging member to restrain the door from being moved in an opening direction -2- C c (The element comprising part of the opening being, for example, a vertical door jamb member or part of an aluminium frame surrounding the opening. In an embodiment, the catch plate and engaging member of the lock body engage when the door is closed to retain the door in a closed position adjacent the element and therefor in relation to the element) In a preferred embodiment, there is an interior hand operable lever or knob (often and herein referred to as a snib) which may be operated to lock the lock to thereby prevent the catch plate from being released disengaged by the engaging member) and a key operable cylinder may be operated from the exterior side or interior side of the door to lock the lock. Importantly there are two locked configurations of the lock: a first locked configuration as shown in Fig 5 from which the lock can only be unlocked by key and a second locked configuration as shown in Fig 6, from which it may be unlocked by snib or key.

Locking by the snib locks to the second configuration only. The lock may be locked to the first configuration by the cylinder.

In one embodiment there is an exterior hand operable locking-snib, (which preferably comprises a recessed cylinder within the body of the exterior handle set which has an accessible slotted recess in it in which the blade of a key may be inserted to operate it), by which the lock may be locked to the second configuration but not the first and which cannot unlock the lock., i.e.

Sothe locking-snib in the exterior handle set can only be used to lock the lock.

25 The locking means described above, the cylinder and exterior lockingsnib and interior snib), is applicable to many types of locks including locks having sliding latch bolts which are spring biased towards their extended protruding position such as that described in the Australian patent 16404/97 and 77719/94 and locks for sliding doors having spring biassed hooked arms 30 which engage a hooked catch plate as the door is closed and any other lock which includes both a cylinder and an internal snib the exterior locking-snib proving means of locking these types of locks from the exterior, to the second configuration enabling subsequent unlocking later from the interior by snib without the need to use a key :Preferably the interior snib, (knob or lever) and exterior locking-snib, (lever, knob or key aperture), are interchangeable at fitting so that for doors which open in the opposite direction, they may be interchanged to convert the exterior handle set to the interior handle set and vice versa, In a preferred embodiment as shown in Fig 1, we see that the lock body 1 comprises a box like casing portion 2 having a back wall 3, a front wall 4, a first side wall 5 and a second side wall comprising a lid (not shown) and upper and lower ends 6 and 7 The lock includes locking means to lock the lock to restrict disengagement between the engaging member and catch plate and preferably the locking means includes both a double cylinder 8 and an interior snib, (being a hand operable member), as described in the embodiments above but the invention also anticipates a lock configured as follows and operable as described below: -3- S SE -o104 (Liu~ IN NT 4 It e A double cylinder only, key operable from both sides each locking and unlocking from the first configuration A cylinder being key operable exteriorly and knob operable interiorly, each locking and unlocking from the first configuration A cylinder key operable on the exterior and being a dummy cylinder interiorly and a hand operable snib lever/knob interiorly, the cylinder locking and unlocking from the first configuration and unlocking from the second configuration with the snib locking and unlocking from the second configuration o A snib lever interiorly only, locking and unlocking from the second configuration A single operable cylinder exteriorly locking and unlocking from the first configuration A single cylinder interiorly locking and unlocking from the first configuration Locks configurations as described above but in which there is a lockingsnib lever exteriorly which can lock the lock to the second configuration Sand other such configurations Preferably the cylinder, for ease of operation of the key is located as far towards the rear of the casing as is practicable and preferably the rear casing wall is omitted behind the cylinder 9.

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Preferably the locking means includes a vertically elongated deadlocking slide 10 (also referred to herein as a locking slide) supported in the casing for 25 rectilinearly movement in a vertical direction and which is moveable by cylinder and snib operation. In preferred embodiments shown in Figs 1 and 2 the locking slide displaces between an undisplaced, (upwardly disposed position) as shown in Fig. 4 and the downwardly disposed locked position shown in Figs 5 and 6 in which, if the engaging member has engaged the catch plate, it restrains the engaging member from being displaced away from the catch plate to disengage it (this position is often, and herein, referred to as the locked position of the locking slide and it corresponds to the first and second locked configuration of the lock) In preferred embodiments a snib cam 11 is supported within the casing in apertures in the side walls. This cam is connected to the snib by a snib shaft 12 and it may also connect to the locking-snib by the same shaft which passes through the lock to protrude into the handle casing on either side.

Preferably the snib shaft is square in cross section and mates in a recess 13 in the underside of the snib 14 of square cross section but preferably the other end is circular in cross section 15 having longitudinally peripheral recesses 16 defined by radially disposed end walls 17 while the associated recess 18 within the locking-snib is substantially circular in cross section and having clearance to relatively rotate on the snib shaft as shown in Figure 4. Within the locking-snib shaft recess is at least one longitudinally elongated inwardly projecting fin 19 which is engageable with an end wall. These members are configured so that when the deadlocking slide is in the undisplaced, unlocked configuration, a fin is adjacent a wall and the snib may be rotated (from a nominal undisplaced position) so that the fin drives the shaft to advance the deadlocking slide to the deadlocked position but if the snib is then turned in

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T SEC 9 N TO~:/ I 1' the opposite direction the fin moves freely within the peripheral recess and does not drive the shaft. A stop 19A is provided to prevent the locking-snib from being rotated in an unlocking direction past the nominal undisplaced position.

Preferably the snib and locking-snib comprise cylindrically elongated members 21 which locate in cylindrical recesses 22 in the underside of the handle casings. These recesses connect to apertures 23 in the outer surface of the handle casings to provide operable accessibility to the ends of the locking-snib and snib. Preferably the snib extends from the exterior surface for ease of operation. The locking-snib stop may comprise an outwardly extending radial shoulder 20 which locates within a peripheral recess 24 in the wall of the cylindrical recesses to limit the rotational movement of the lockingsnib.

In one embodiment the snib cam 11 has snib arm 25 with a pinned protrusion 26 at its end which locates within a horizontal slot 27 in the deadlocking slide to couple them together while in another it includes peripheral gear teeth 28 which engage a rack portion 29 of a slide 30 which is operably coupled to the deadlocking slide as described below.

In the embodiments shown in the drawings, the cylinder is a commonly used double cylinder having a centrally located cylinder cam 31 which is angularly displaceable by key operation to drive the deadlocking slide but the lock may within the scope of this invention be adapted for compatibility with other types of cylinder.

In a preferred embodiment, the deadlocking slide comprises a substantially rectilinearly moveable vertically elongated member 10 which is supported in the casing and which has a substantially horizontal drive slot 58 towards the 30 top end, (which is coupled to an arm 59 which can force a drive shoulder 57 ofthe !engaging member 60 downwardly to ensure it has has been driven to S• the fully downward position by its associated spring), and a rack portion 34 towards the lower end which is coupled to the snib cam having a geared peripheral 28 portion and a concave cam recess 35 within its length engageable with the pivotally supported cylinder cam comprising part of the key operable cylinder, said recess having an upper drive shoulder 36 98 and a lower drive shoulder 37. Towards the upper end of the casing_and supported by a pin 62 projecting from a side wall of the casing and located towards the back of the casing is an angularly_displaceable deadlocking arm 59 which has 40 a sideways protruding pin 63 within its length which locates within the drive slot 58 at the upper end of the deadlocking slide and which has an end 64 which protrudes into the path of movement of a drive shoulder 57 of the engaging member. Preferably these portions are so configured that an S• undisplaced deadlocking slide enables the engaging member to move to the 45 undisplaced disengaged, position but movement of the deadlocking slide in a S* locking direction causes the deadlocking arm to drive the engaging member to move towards the engaged position and to subsequently secure the engaging member in the position in which it engages the catch plate.

In this embodiment within a first range of movement the cylinder cam and the deadlocking slide are coupled whereby translational movement of the deadlocking slide causes the said cam to angularly displace while angular displacement of the cam causes the deadlocking slide to displace. Within this first range of movement the deadlocking slide may be actuated by either the snib cam or the cylinder cam. The limit of this first range of movement in a locking configuration corresponds with the second locked configuration. From this position, the cylinder cam may be further displaced in a locking direction while the deadlocking slide remains substantially unmoved and where coupling between the cylinder and deadlocking slide cease so that the deadlocking slide can no longer displace the cylinder cam and in effect displacement of the cylinder cam into the second range of movement secures the deadlocking slide this corresponding the first configuration of deadlocking. When the deadlocking slide has been moved to the deadlocking position and the cylinder cam moved to the first locking configuration a inclined surface 41 of the exit shoulder, lies substantially orthogonal to the pivotal axis 42 of the cylinder cam. At this point, Fig 6, the leading edge 43 of cam can be moved to slide on the inclined surface without substantially moving the deadlocking slide. In a preferred embodiment, the lower or exit shoulder of the deadlocking shoulder may comprise a slide 44 supported by the deadlocking slide for limited vertical movement and biassed upwardly by spring 45 so that for the cylinder cam to be moved to the position corresponding to the first locked configuration this slide must be displaced against spring bias while the deadlocking slide remains undisplaced. The 25 attached figures show a preferred embodiment where the slide 44 comprises a shoulder having projecting legs 65 having projecting legs 65 with returns 66 which locate around a T shaped shoulder 67 of the locking slide.

In yet another embodiment, operation is provided for upper and lower remote *30 locks. The lock includes a geared pinion 46 supported by the casing preferably on a pinned protrusion 47 from the side of the casing and engaged to the rack portion 34 on the lower end of the deadlocking slide to operably couple them. The deadlocking slide may project from the casing so that it may be connected to rods connected to remote locks. The pinion is coupled on the opposite side, towards the back of the casing to a lower drive slide having a rack portion 29 which projects from the lower end of the casing so that it may be connected to a lower rod 52 connected to a lower remote lock.

Preferably the pinion has adjacent the first peripheral geared portion a second geared portion 53 of larger diameter (in a preferred embodiment twice the 40 diameter), which meshes with the lower drive slide and preferably there is an upper drive slide 54 which projects from the upper end of the casing and which meshes with the larger pinion portion this having a rack portion 51 By this means movement of the deadlocking slide imparts increased movement to the upper and lower drive slides. Preferably the protruding ends of the drive 45 slides include apertures 55 by which the rods may be secured to drive remote locks. The snib cam in this embodiment may have a geared peripheral portion 28 which meshes with the lower drive slide.

-6- Throughout this specification and claims which follow, unless the context requires otherwise, the word comprise" and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers and the positional prepositions such as up, down, rear which are used to assist in description of the preferred embodiments have in general no absolute significance.

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