DESCRIPTION TECHNICAL FIELD The present invention relates to locks and particularly to locks adapted for a wide variety of applications providing domestic door locks, high level security locks with or without cooperating timing devices, motor vehicle ignition locks and the like.

BACKGROUND ART The state of the locksmiths art has reached a very high level of expertise, particularly in relation to mechanically operated locks. Recent developments in key copying machines have however considerably reduced the security of these locks, in view of the ease with which key copies, including master keys, may be made and the difficulty for the lock concerned to be altered to reject a key that has been duplicated without authority.

DISCLOSURE OF INVENTION Our invention overcomes this difficulty and has been developed without reference to locks of the prior art. Accordingly many features of our lock are entirely novel. Whilst a preferred embodiment of the lock will be described herein with reference to a domestic door lock, in its broadest form our invention comprises a lock including a locking member, said locking member being movable between a disengaged and an engaged position, said lock including movable actuating means and substantially immovable non-actuating means, said movable means being operable to cause said locking member to move between said disengaged and engaged positions, a key means interengageable with said non-actuating means and said movable means, said key operative to actuate said movable means and thereby said locking member.

According to a further aspect of the invention the said locking member is biassed towards the said disengaged position.

According to a still further aspect of the invention there is provided a lock having movable and substantially immovable rod-like segments arranged in a generally parallel and preferably coaxial relationship; means for accomodating a key including a token at a position adjacent one end of the rod-like segments; and means for moving the thus accommodated token over the substantially immovable rod-like segments and against the movable rod-like segments, thereby to move the movable segments. BRIEF DESCRIPTION OF DRAWINGS

A preferred embodiment of the invention will now be described with reference to a domestic door lock. In the accompanying drawings,

Fig. 1 is a sectional elevation in a locked (unengaged) configuration with the cylinders equidistant within the casings, rather than eccentric and the handle withdrawn;

Fig. 2 is a sectional elevation in an unlocked (engaged) configuration;

Fig. 3 is an exploded view; Fig. 4 is an end view on the line IV-IV of Fig. 3;

Fig. 5 is an end view on the line V-V of Fig. 3;

Fig. 6 is a sectional elevation of the key;

Fig. 7 is a plan view of the key;

Fig. 8 is an inverted plan view of the handle with the key in position;

Fig. 9 is a perspective view of the adjustment tool; and

Fig. 10 is a transverse view on the line X - X of Fig. 1. DESCRIPTION OF PREFERRED EMBODIMENT

Referring to Fig. 3 there is provided a handle 10 having a cylindrical neck 11 adapted to be axially movable into and away from a collar 12 of a door rose 13. In use, the rose 13 is positioned within a suitable circular recess in a door (not shown) such that the shoulder 14 of the rose bears against the face of the door. Figs. 1 and 2 clearly illustrate this, and emphasise a major advantage of this

OMPI

/, WIPO

invention in that the lock mechanism is substantially within the door and not within the handle as is the case with the prior art. This of course adds to the security of the lock.

The rose 13 is secured to the door by means of bolts (not shown) passing through the door from the other side and engaging the rose in threaded recesses, one of which is shown at 60.

The collar 12 is provided with an internal flange 15 which comprises the upper limiting means for a main compression spring 16, the other end of which bears against a flange 17 of the lock casing 18. The lock casing is secured to the handle 10 by three bolts 19 and is biassed away from same by said spring 16.

The outer casing 18 is axially movable within said rose 13, and is constrained by a first circlip 20 engaged in an annular groove 21 in the lock casing best shown in Figs 1 or 2.

The lock mechanism comprising the crux of this invention is housed within the casing 18 and is prevented from rotating therein by three rods 22 secured in an inner collar 23. The rods 22 allow axial movement of the lock mechanism by sliding within bores 57 provided in the casing 18 best shown in Figures 1 or 2.

The inner collar 23 is secured within the outer casing 18 by a second circlip 24 engaged in a second annular groove 25 in the outer casing 18. Within the inner collar 23 is provided the lock cylinder 26, which is provided with a number of fixed rods 29 coaxial with the lock assembly. The lock cylinder is secured against rotation or axial movement within the inner collar by a grub screw 27 which is tightened against a shoulder 28 of the cylinder. Hence the cylinder and inner collar may rotate within the outer casing but are restrained axially. The fixed rods 29 are preferably of equal length, and protrude to a level just below the rim of the outer collar 12. These fixed rods may vary in diameter,

OMPI

^ τii

shape, number and location in the lock cylinder 26.

The inner collar/cylinder, outer casing and outer collar deliberately make a loose fit one within the other, although the components within cylinder 26 are fitted with decreased tolerances. The reason for the variation in tolerances will be explained more fully below.

An inner cylinder 30 having any desired combination of fixed rods 31 and sliding rods 32 protruding therefrom is provided eccentrically within the upper portion of said outer cylinder 26, such that the said rods also protrude into the neck of the rose collar to a distance approximately the same as the fixed rods 29 but eccentrically with respect to same. The sliding rods 32 are located within bores 33 and their upper ends are provided with shoulders 34. Removal of the sliding rods is also prevented by deformities in the lower ends of the rods as shown in Figs 1 or 2. The locking member is provided within said inner case 30, and in this embodiment comprises a brush 36 loosely mounted on a rod 37.

Within the lower portion lock cylinder 26 is located a sleeve 38 having a shoulder 39 on the lower side thereof and castellations 40 on the upper face thereof. The sleeve is affixed to the inner cylinder 30 by any suitable means, such as silver solder ^■ or threaded engagement. It is obviously important the sleeve be rotated with respect to the inner cylinder before it is affixed to same, in order that the same degree of eccentricity is achieved. This is desirable to ensure the axis of the locking member is parallel to the axis of the lock. An internal flange 41 is provided on the inner sides of the sleeve 38, as seen in Figs. 1 and 2. Said sleeve is secured against rotation or axial movement within the lock cylinder by any suitable means such as a cup head bolt 42.

Within the sleeve is provided a connecting member 43 which is biassed over rod 37 and against locking member 36 by a compression spring 44 which in turn is restrained by a bar

O PI IPO

^* τi

45 through a hole in the inner end of the locking member 43 and the flange 41.

The inner end of the connecting member is bored out at 59 to accomodate rod 37. The operative end of the connecting member 43 is shaped into a square rod at 47 to engage a square hole 58 in any known latch withdrawal mechanism shown generally at 48 in Figs. 1 and 2. The hole in this sleeve through which the locking member passes is eccentric in relation to the cylinder by ^' approximately 0.05 inches. The key as shown in Figs. 6 and 7 comprises a flat frame 49 to which is attached a handle 50. The frame is made unidirectional by a tongue 51, and is provided with two rotatable tokens 52, 53 one within the other.

The placement of this inner token 53 is eccentric within the outer token 52 provides greater mu ber of combinations and thus greater security. Each token is provided with holes 56, which may be varied in number size and location from key to key to suit the variations on the cylinders. In an unillustrated variation the key may be more acceptable to the consumer by the provision of a handle that folds into the same plane as the frame.

The inner face of the neck 11 of the handle 10 is provided with a shallow recess 54 for receiving the key when offered up to the handle in a radial direction. Further, the side of the neck 11 is recessed at 55 to accomodate the key handle 50 on release of the door handle 10 and axial movement of the key within the collar 12. This will now be fully described.

The following relates to the installation of the lock in an exterior door handle, and in most cases is matched with a normal direct acting handle on the inside of the door.

Normally, the handle will inoperatively turn without resistance, the connecting member being withdrawn within the cylinder by spring 44. Hence the handle is not linked to the known latch mechanism, and the door is "locked". The lock

OMPI

the subject of our invention is in "neutral" or disengaged.

The handle is biassed towards the door by spring 16, but may be axially withdrawn so that a key may be radially inserted into recess 54 on the inner face of the handle neck 11. The key must be fully inserted to allow the legs of the handle to fit into recess 55.

Once the key is in position in the handle, the handle may be released, causing the key to be axially carried onto the rods 29, 30 and 32. The key is held by the base of the neck 11 on one side, recesses 54 and 55, and the upper end of the casing 18 on the other side. Thus the handle, casing and key axially and rotationally move together in relation to the lock cyclinder, inner casing and sleeve.

The inward movement of the key and handle will continue only if the holes in the tokens match the rods with regard to number, spacing, size and shape. If the key does not fit, the handle will turn inoperatively. Rotation of the handle and key may be necessary before the key will come to the correct position and the rods penetrate the tokens. On further inward movement of the handle the key slides along the fixed rods, but depresses the two movable rods by bearing down on their shoulders 34. These rods, which are diam etrically opposed, slide the locking member 36 along rod 37 bearing down on the connecting member 43. The connecting member moves out of sleeve 38 against the bias of spring 44. At this stage rotation of the handle will not open the door, although the key is engaged with and may turn the cylinder.

Further release of the handle results in the bar 45 entering one of the slots forward by the castellation 40 of the connecting member and the entry of the operative end of the connecting member into the co-operative recess 58 in a known latch withdrawal mechanism. Obviously the configuration of the operative end 47 may be adapted to cooperate with the latch mechanism that is desired.

Once the handle is fully released rotation will cause

OMPI ., IPO

the sleeve, and thus the bar and the connecting member to turn. Hence the door will open.

It is obviously essential that cup head bolt 42 be tight, ensuring no slippage between the sleeve and the cylinder. Other methods of securing these components form part of the invention, as does equivalent methods of securing the cylinder to the collar 23 other than by the grub screw 27.

In the preferred form shown, two movable rods 32 are used. This provides protection against the unauthorised depression of one rod 31, as the bush, which is a loose fit on rod 37, would then become misaligned due to the uneven pressure and lock on rod 37. Friction means such as the provision of thread on rod 37 may be used to enhance such locking action. The immobilisation of the bush thus prevents movement of the connecting member.

A major advantage of our invention is found in the ability to reset the tokens within the key. Either one or both tokens may be reset. Should it be desired to rotate the inner token in relation to the outer token and the key frame, the key is inserted in the door in the normal way. The inner handle assembly (which is not subject to security measures) and the outer handle assembly are removed, exposing the inner face of the lock assembly. The cup head bolt is loosened, and an adjustment tool (Fig. 9) is fitted to the holes 61 in the sleeve and the whole rotated as desired. See Figs. 4 and 5. This action causes the pins 31, 32 to rotate with respect to pins 29, and hence the inner token relative to the outer in the key. The bolt 42 is then re-tightened.

To alter the outer token in relation to the key frame, the grub screw 27 is loosened, and the tool applied to holes 62 in the collar 23. Rotation of the collar within the casing 18, which holds the key via the handle recess, achieves the desired result.

Hence a large number of positoris may be achieved for 1 key/lock combination. Variations in the size, shape

position of the holes/rods provides an almost infinite number of combinations.

The ability to easily re-set the lock and its key is seen as one of the most important advantages of the invention. No master key system is thought to be applicable, thus further increasing security.

If desired, a second lock may be fitted to the inner handle, in which case the inner collar (not shown) of the rose of the second lock would be lengthened and expanded to project further through the door to engage and slide over the collar 63 of the first rose. In this case transverse holes are provided through the overlapping collars and long expanding bolts of the Luxon type used from the edge of the door to lock the two collars, and hence the two lock assemblies, together.

Where only the outer handle is fitted with a lock, the inner handle may be provided with a snib to prevent the locking member engaging. Thus even possession of a correct key would not guarantee entry if the inner handle were snibbed.

INDUSTRIAL APPLICABILITY

Whilst our invention has been described in relation to a domestic door lock as represented in the drawings, it is to be appreciated the lock mechanism may take on many forms bearing little physical resemblance to the door lock drawn. The invention has application ranging from simple domestic systems to the highest level of security control, for example in bank vault mechanisms and defence establishment uses.

Naturally, the higher the level of security required, increasing use may be made of preferred design features such as multiple cylinders, eccentricity of cylinders and tokens, multiple tokens, and the use of sophisticated means equivalent to the connecting member.