GB2151690A - Patio door locks - Google Patents

Abstract

A lock assembly especially for sliding doors comprises a casing of sheet metal and a rectilinearly slidable locking bar (28) of channel section movable by pin (34) engaging in the slots (30) and itself movable by an external handle. Tapped bush (14) protrudes through for end plate (12) and bears a bar having headed pins which engage keyhole slots in a keeper plate. An actuating arm (40) carrying the pin (34) has two notches (44, 46) and the arm is movable between two positions in each of which one of the notches is engaged by a spring (50). A dead-lock (43) can be moved by cam (76) on cylinder lock (16) into and out of the path of bar (28). End (60) of spring (50) permits the dead-lock to move into the blocking position but must be lifted by deflector (72) acted on by cam (76) before it allows it to be withdrawn. <IMAGE>

Description

SPECIFICATION Door and window lock This invention relates to door and window locks in which the components to be secured by the lock operate with a "sliding" action. Broadly, at least one of the components of the door or window assembly (i.e. including the fixed frame) is opened and closed by rectilinear motion relative to the other component.

Such doors and windows have advantages in relatively confined spaces since the conventional, vertically-hinged, door or window may give rise to a certain amount of dead space within the associated room. It follows that, in particular, rectilinearlymovable doors known as patio doors have become popular, but unless expensive locks are used, ingress of unauthorised persons are unacceptably easy. Even certain "dead" locks, that is locks which are activated by turning a key as opposed to a mere spring loading, can very readily be unlocked by an unauthorised person who has sufficient knowledge of the details of the locking mechanism.In one such lock the deadlock stop has an arcuate movement which is controlled by a pin movable in an arcuate slot but this slot has the effect of exposing to a knowledgeable, but unauthorised, person a part of the mechanism which enables the dead stop to be released. In another proposed lock for use with patio doors the dead stop can very readily be released by application of a tool of a very simple nature to a member which is movable in a part of the casing which provides for guidance of that member.

For both of these previous proposals, it is possible to overcome the security risk by fitting a plate over the relevant openings in the casing, but this adds both to the complexity of the construction and more importantly to the labour required for installation of the lock.

According to the present invention there is provided a lock assembly comprising a casing, a locking bar slidable between a locked and an unlocked configuration, a deadlock stop, a cylinder lock arranged to move the deadlock stop to deadlock the locking bar in the locked configuration and means operative to deadlock the deadlock stop in the said locked configuration of the locking bar.

Further according to the present invention there is provided a lock assembly comprising a casing, a locking bar slidable between a locked and an unlocked configuration, actuating mechanism of the locking bar, a slidable deadlock stop movable to prevent motion of the locking bar in the locked configuration thereof, a cylinder lock having a cam operative to move the deadlock stop and spring means which act to deadlock the deadlock stop in the deadlocked position thereof.

Still further according to the present invention there is provided a lock assembly comprising a casing of sheet metal, a rectilinearly slidable locking bar of channel section metal sheet and having opposed slots in the limbs thereof, a pin engaged in the slots of the bar and in arcuate slots of opposed side walls of the casing, an actuating arm carrying said pin, an actuating sleeve having two notches therein and carrying said arm, the sleeve being movable between two positions in each of which one of the notches is engaged by a spring, one position corresponding to the locked configuration of the locking bar, a deadlock stop rectilinearly slidable in the casing between a deadlock configuration in which the stop prevents motion of the locking bar and a release configuration, the stop having notches engageable by an end portion of said spring, one notch corresponding to the release and the other to the deadlocked configuration, in which latter configuration the stop is itself deadlocked by the spring, a cylinder lock carrying a cam for moving the deadlock stop between the said two configurations and a deflector for disabling the locking action of the spring end portion on the stop.

A lock embodying the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawings, in which: Figure 1 is an external side elevation of one embodiment of the lock; Figure 2 is a plan view of the lock illustrated in Figure 1; Figure 3 is a diagrammatic longitudinal section of the lock taken from the same aspect as Figure 1, and to an enlarged scale; Figure 3A is a scrap view illustrating the relationship of certain parts illustrated in Figure 3; Figure 4 is a diagrammatic plan view, partly in section, illustrating the lock as installed; Figure 5 is an end on view of the lock; Figure 6 is an exploded perspective view of a part of the lock and an associated sliding panel frame; Figure 7 is an exploded perspe -tive view of another part of the lock and an outer jamb of the associated sliding door; and Figure 8 is an exploded perspective view illustrating the fitting of the lock of Figures 1 to 7 in a sliding door assembly.

Referring now to the drawings, the lock has a conventional heavy-duty, pressed-steel, casing 10, 1 0A, with a face plate 12 through which protrudes a part of a tapped bush 14 and has a generally conventional cylinder lock 16 details of which are omitted. The cylinder lock 16 is held in place by a screw 17, see Figures 5 and 8. The operative part of the bush 14 protruding beyond the plate 12 has a tapped hold appropriate to enable secure engagement with a pin bar sub-assembly 29 as shown in Figures 4 and 6. Other, generally conventional parts include pull handles 18, 20 with knobs or elongate hand grips 22, 24. As will be seen in Figure 4, a part of the cylinder 16 protrudes from cover plate 25.

The two halves 10, 1 OA of the casing are secured together by screws 26A illustrated only diagrammatically in Figures 1,3 and 8, the screws being received in tapped pillars 26B (ends shown in Figure 3) mounted in the opposite side members of the casing 10, 10A.

Other, generally conventional, parts of a lock are illustrated in Figures 4 and 8 and will now be briefly referred to. Binding posts 27 each rec.eiuod a screw 26C and together these parts secure the pull handles 18,20 to a sliding panel frame 82 (Figure 8) The frame 82 is an aluminium or a light alloy extrusion.

Cover plates 25 and pull handle end caps 86 are inserted in the sliding panel frame 82 before the cylinder 16, which latter when inserted and secured by the screw 17 retains the cover plates 25 in their grooves. The cover plates when thus secured serve to conceal the screws 26C and the posts 27.

Externally of the lock itself and mounted, when installed in the sliding frame between grooves 19 Is the pin bar sub-assembly 29 secured by a cap screw 31. A keep bar 33 lies parallel to a keep clamp 35 and these parts are held together by screws 37. only one shown. The keep bar 33. as Indicated in Figure 7 is retained between grooves 39 of an outerjamb 84 by the screws 37 and the keep clamps, the latter being received at two opposed edges in further grooves 41, of re-entrant form provided in the extrusion forming the outer jamb 84. The keep bar 33 has a slot 33A having an enlarged opening for receiving the head of the pin 31 in the unlocked configuration, the head being retained by the narrower portion of the slot when in the locked configuration.

Turning now, in particular, to Figure 3 the bush 14 is rectilinearly slidably movable in a slot 15 in the face plate 12 and is mounted on a slide subassembly 28, the slide co-operating with a deadlock stop 43 to be described in detail hereinafter. The slide sub-assembly will be, in practice, a channel section member with a U-shaped slot 30 in the two opposed limbs of the channel. Each slot 30 receives a pin 34 which pins are movable over an arcuate path defined by slots 36 (only one shown) in each side wall 10, 1 OA of the casing 10. The pins 34 form parts on an arm 38 and a sleeve 40 which can be turned as a rigid assembly by one or other of two handles 42 (Figure 4) of the lock assembly.

Actuation can, of course, only take place when the cylinder 16 has released the deadlock to render it inoperative. The arm 38 is mounted on a square section bar 45 which passes through the lock and is connected directly to the handles 42. The arm 38 is thus rotatably mounted in the two opposed side walls 10, of the casing.

The arm 38 has two peripheral, transverse, notches 44,46 which are engaged alternatively by an arcuate loop 48 in a spring, generally referenced 50. The spring 50 also includes a hook portion 52 by which it is engaged in an aperture in a rear portion 54 of the casing 10 and also has an arcuate portion 56 which engages around a pillar 57 rigid with the opposed side walls of the casing 10. An end portion 60 of the spring 50 engages in either one of two transverse notches 62, 64 in the deadlock stop 43.

The deadlock stop 43 also includes two lateral guides 66 which slidably engage in slots 68 in each of the side walls 10, OA of the casing. The stop has an internal slot 70 (broken lines) which slidably receives a spring deflector 72 illustrated in Figure 3A in end view. The deflector Is T-shaped and the cross bar 74 of the T is arranged to lift the end portion 60 of the spring 50. The shape of the notches 62,64 is such that motion Is permitted freely only in the locking direction, any unauthorised tampering with the guides 66 being resisted by the action of the tips of the portion 60 of the spnng engaging against the steep side of the notch 64. With the deflector In the "down" position it is impossible to overcome the action of the spring in the notch 64.

The cylinder 16 includes a cam 76 which is moved only by the operation of the cylinder key. The cam cooperates with two followers 78, 80 integral with the deadlock stop 43. Motion of the cam in a clockwise sense (as illustrated) serves first to engage the deflector 72 thus raising the spring end portion 60 and then to engage the follower 80 so that the stop 43 is moved to the right as the guides 66 slide in the slots 68. The slide sub-assembly 28 is then free to move under the action of the handles 18,20 and associated parts.

The operation of the lock from the user's standpoint is very simple. When the deadlock is inoperative the spring holds the deflector 72 in the "down" configuration so that the spring end portion 60 engaged in the slot 62, and the handles 18,20 can be turned against the relatively light action of the spring ioop 48 in the notches 44,46. The locking bar is thereby moved from the locked to the unlocked configuration, at will. The deadlock stop is, under these conditions, retracted to the inoperational location (not shown) so that the locking bar can be freely moved.

The deadlock stop 43 is brought to the operative, illustrated configuration by turning the key of the cylinder 16 by interaction between the cam 76 and the follower 78. The spring end portion 60 offers no resistance to this motion as the notch 62 has one inclined face which acts progressively to lift the portion 60 with a wedge action. The spring deflector 72 falls under spring pressure and the portion 60 engages in the notch 64. Any attempt to tamper with guides 66 and thereby release the dead stop 43 then becomes impossible as the tip of portion 60 engages firmly against the steeper face of the notch 64.

Claims (8)

1. A lock assembly comprising a casing, a locking bar slidable between a locked and an unlocked configuration, a deadlock stop, a cylinder lock arranged to move the deadlock stop to deadlock the locking bar in the locked configuration and means operative to deadlock the deadlock stop in the said locked configuration of the locking bar.

2. A lock assembly comprising a casing, a locking bar, slidable between a locked and an unlocked configuration, actuating mechanism ofthe locking bar, a slidable deadlock stop movable to prevent motion of the locking bar in the locked configuration thereof, a cylinder lock having a cam operative to move the deadlock stop and spring means which act to deadlock the deadlock stop in the deadlocked position thereof.

3. An assembly according to Claim 2, wherein the deadlock stop has notches with a configuration such that motion of the stop is possible only in one direction, means, operative by the cylinder lock being effective to disengage the spring means from the notches In tne Inoperative condition of the deadlock stop

4. An assembly according to Claim 2 or Claim 3, wherein the spring means is common to the actuating mechanism of the locking bar and the deadlock stop.

5. An assembly according to Claim 2, Claim 3 or Claim 4, wherein the actuating mechanism of the locking bar Includes a notched, rotatable arm, the notches cooperating with the spring means in respectively the locked and unlocked configurations, and a slot in the locking bar receiving a pin carried by the arm.

6. An assembly according to any one of Claims 2 to 5, wherein the locking bar is of channel section.

7. A lock assembly comprising a casing of sheet metal, a rectilinearly slidable locking bar of channel section metal sheet and having opposed slots in the limbs thereof, a pin engaged in the slots of the bar and in arcuate slots of opposed side walls of the casing, an actuating arm carrying said pin and having two notches therein, the sleeve being movable between two positions in each of which one of the notches is engaged by a spring, one position corresponding to the locked configuration of the locking bar, a deadlock stop, rectilinearly slidable in the casing between a deadlock configuration in which the stop prevents motion of the locking bar and a release configuration, the stop having notches engageable by an end portion of said spring, one notch corresponding to the release and the other to the deadlocked configuration, in which latter configuration the stop is itself deadlocked by the spring, a cylinder lock carrying a cam for moving the deadlock stop between the said two configurations and a deflector for disabling the locking action of the spring end portions on the stops.

8. A lock assembly substantially as hereinbefore described with reference to the accompanying drawings.