LOCKABLE HANDLE

Abstract: An espagnolette handle assembly is locked when a handle head (20) is aligned with a backplate (17) and a lock (25) has been finger-pressed through a slideway (26) against a spring (51) for a locking pin (33) to enter a catch recess (35). The lock (25) is automatically held in this locking position by a spring-loaded latch pin (27) entering a recess in the head (20). To unlock the handle a key (29) is inserted and turned to withdraw the latch pin (27) allowing the spring (51) to slide the lock (25) to its unlocking position.

Description: This invention relates to a lockable handle, particularly, but not exclusively for fitting to uPVC windows and the like in which a square bar of the handle operates drive gear within the window frame that extends or retracts locking cams. Particularly where the handle is of relatively compact dimensions the provision of a key operated internal lock has presented problems, because standard barrel locks are too large to fit satisfactorily. The difficulty is solved, according to the invention, by providing a handle assembly comprising a handle member pivoted to a backplate, a lock slideably retained in the handle for movement towards or away from the backplate to engage a depending locking pin carried thereby in a recess in the backplate and thereby obtain a required locking effect simply by such movement, and a secondary latch member operable on manual depression of the lock to latch the lock in a position lowered towards the backplate until disengaged by operation of key operated release means, the lock comprising a body which is a sliding fit in a slideway formed in the handle member and directed normal to the backplate the locking pin being integral with the body and the latch member being biased towards an extended position by a spring within the body to be retracted by the release means constituted by a key operated barrel rotatable in the body, the slideway having a plain region in which the latch member is held retracted and a recess into which the latch member snaps when the whole body is pressed to a locking position, characterised in that the body is a unitary body and that the slideway has a second recess extending from its end adjacent the backplate a distance at least equal to the travel of the lock, and the lock has a second pin which is captive in the second recess, with a biasing spring in the second recess urging the lock away from the backplate. An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:- Figure 1 is an exploded view of a locking espagnolette handle assembly according to the invention; Figure 2 is an underneath view of a handle member forming part of the assembly of Figure 1 with the lock removed; and Figure 3 is a scrap perspective view of the underside of the handle. In Figure 1 an espagnolette handle assembly 10 comprises a handle member 12 that is attached to a square spindle member 14 with an intervening plastics washer 13 which is rotationally supported, e.g. in a sleeve in an aperture 16 of a backplate 17 having through-holes 18 for attachment to an open-out top or side hung window or door of uPVC. The handle 12 has a head region 20 adjacent the backplate 17 that is joined by a transition region 22 to an offset grip region 24, and an object of the invention is to fit a key operated lock into the restricted available space in the head region 20 between the spindle member 14 and the transition region 22. The problem of space is particularly acute in backplates and handles of width about 16 mm or less which are needed for the smaller sizes of uPVC extrusions. The problem is solved, according to the invention, by providing a lock 25 comprising a body which is of retangular or other non-circular shape when viewed in plan and is a sliding fit in a corresponding slideway 26 formed in the head region 20 normal to the backplate 17. The lock 25 has a forwardly facing latch pin 27, biased towards an extended position by a spring within the body that is retractable on insertion of a key 29 into a key-operated release means in the form of a lock barrel 31 and on rotation of the barrel 31, a depending locking pin 33, that when the handle 12 is aligned with the backplate 17, registers with a catch recess 35, and a rearwardly facing pin 37. As may be seen in Figure 2, the slideway 26 is bounded by a forward recess 39 into which the pin 27 fits and that is relatively shallow and a rearward recess 41 into which the pin 37 fits and that extends from its end adjacent the backplate 17 a distance at least equal to the travel of the lock 25. The recesses 39, 41 are directed normally away from the back plate 17 and extend part way only through the head region 20. Recess 41 is bounded by cut-away region 43 into which there fits an angular cover plate 45 held in place by a retaining screw 47 that fits into bore 49. A coil spring 51 fits in compression between the pin 37 and the cover plate 45. The lock 25 is trapped in the handle 12 by abutment of the pin 37 with the upper end of the recess 41 towards which it is urged by the coil spring 51. At this upper position the latch pin 27 is held retracted into the body of the lock 25 because it is in register with a plain region of the slideway 26 above recess 39. The top face of the lock 25 protrudes above the body region 20 at this upper position. Finger pressure on the lock 25 depresses the lock against the resistance of spring 51, bringing the latch pin 27 into register with the recess 39 into which it is snapped outwardly because of its spring loading. The lock 25 is then retained by latch pin 27 in a lower position in which assuming that handle 12 is correctly aligned with backplate 17, the locking pin 33 is within the recess 35 and the handle 12 is prevented from rotating relative to the backplate 17. Release of the handle 12 is effected by inserting key 29 into barrel 31 and rotating the barrel 31 so that latch pin 27 is retracted from the recess 39 and the lock 25 is snapped from its lower to its upper position by action of the coil spring 51, freeing pin 33 from recess 35. It will thus be seen that the handle 12 and backplate 17 are provided with a sliding lock having a vertical line of action and which is movable by finger pressure from an upper release position to a lower locking position in which it is held by second latching means until released by insertion of key 29 into barrel 31 and rotation of the barrel 31.

Claims: 1. A handle assembly (10) comprising a handle member (12) pivoted to a backplate (17), a lock (25) slideably retained in the handle member (12) for movement towards or away from the backplate (17) to engage a depending locking pin (33) carried thereby in a recess (35) in the backplate (17) and thereby obtain a required locking effect simply by such movement and a secondary latch member (27) operable on manual depression of the lock (25) to latch the lock (25) in a position lowered towards the backplate (17) until disengaged by operation of key operated release means (31), the lock (25) comprising a body which is a sliding fit in a slideway (26) formed in the handle member and directed normal to the backplate (17) the locking pin being integral with the body and the latch memher (27) being biased towards an extended position by a spring within the body to be retracted by the release means constituted by a key operated barrel (31) rotatable in the body, the slideway (26) having a plain region in which the latch member (27) is held retracted and a recess (39) into which the latch member (27) snaps when the whole body is pressed to a locking position, characterised in that the body is a unitary body and that the slideway (26) has a second recess (41) extending from its end adjacent the backplate (17) a distance at least equal to the travel of the lock (25), and the lock (25) has a second pin (37) which is captive in the second recess (41), with a biasing spring (51) in the second recess (41) urging the lock (25) away from the backplate (17). 2. An assembly according to Claim 1, characterised in that the handle member (12) has a head region (20) adjacent the backplate (17) and connected to a spindle member (14), a grip region (24) offset from the backplate (17) and a transition region (22) joining the head region (20) to the grip region (24), and the lock (25) fits into a part of the head region (20) between the spindle member (14) and the transition region (22). 3. An assembly according to Claim 1 or Claim 2, characterised in that the lock (25) is of non-circular shape when viewed in plan.

Inventors: MOORE, JOSEPH, TASKER,ROGER WILLIAM
Applicants: WMS GROUP LIMITED
Application year: 1988
Main classification: E05B13
IPC codes: E05B13