GB2249807A - Push barrel lock for a pivoting handle - Google Patents

Abstract

The invention relates to a push lock for a pivoting handle (18), of the type comprising a barrel (2) which can be set in rotation by means of a coded key, said barrel (2) being seated coaxially in a receptacle of said handle, being integral in terms of translational movement with a locking finger (3) and being returned by a spring. According to the invention, said barrel (2) is seated in a sleeve (1) fastened in said handle, said barrel (2) having a radially projecting stud (4), (14) interacting with a helical groove (10) of said sleeve (1), said groove terminating in a substantially axial offset (11). The barrel (2) is of the type with tumblers returned by springs, said sleeve (1) having two diametrically opposed grooves for accommodating said tumblers in the locked position and an end zone for the exit of said tumblers which is connected to said grooves by means of an inclined slope, so that when the barrel is pushed back in without the use of the key, the tumblers enter the groove and are reset automatically, the pin (4), (14) entering the offset (11) in the locked position. <IMAGE>

Description

" -1.1 2249;) 4 i Push lock for a Divotinq handle The invention relates to

a push lock for a pivoting handle, of the type comprising a barrel which can be set in rotation by means of a coded key, said barrel being seated coaxially in a receptacle of said handle, being integral in terms of translational movement with a locking finger and being returned by a spring. The handle can, for example, be that of a window.

The use of a push device for locking a pivoting handle is known to be convenient in terms of manipulation, in particular for window handles. In general, the handle is unlocked by releasing the push device by means of a pawl seated on the face of the window turned towards the interior of the room.

However, these known devices do not afford sufficient security, and it has been proposed to -lock the handle by means of a key-operated lock. The solutions provided are complicated, involve a high outlay and are bulky, and they often lack the convenience of use of a simple push device, the depression of which is sufficient to bring about the locking.

The object of the invention is to provide a push lock of simple, economical and compact construction, which allows a secure locking simply by the depression of the push device.

For this purpose, the push lock according to the invention - is characterised in that said barrel is seated in a sleeve fastened in said handle, said barrel having a radially projecting stud interacting with a helical groove of said sleeve, said groove terminating in a substantially axial offset,. said barrel being of the type with tumblers returned by springs, said sleeve having two.diam(trically opposed grooves for accommodating said tumblers in the exit position and an end zone f or the exit of said tumblers which is connected to said grooves by means of an inclined slope.

When the push device is unlocked, the barrel is in the exit position and the tumblers are in the end J i i tumbler-exit zone. The key can therefore be extracted. Locking can be carried out with the key in the barrel by depressing the latter counter to the action of its return spring. If the key is withdrawn, the barrel can be depressed, the tumblers being returned into the barrel by means ofirthe inclined slope provided in the sleeve.

In both- cases, the depression of the barrel causes its rotation as a result of the interaction of the stud with the helical groove of the sleeve. At the end of depression, if the key is in the barrel, the return spring pushes the stud into the axial offset of the lock. If the key has been removed, the tumblers occupy their locking position in the diametrically opposed grooves, as with the preceding example after the extraction of the key. The locking finger has come into the locking positio n and can be retracted only after the insertion of the key and the opposite rotational /translational movements of the barrel.

Preferably, the stud consists of a projecting end of a pin for fastening the locking finger to the barrel.

The invention will be understood clearly from a reading of the following description made with reference to the accompanying drawing in which:

Figure 1 is a partially cut away diagrammatic elevation view of a push button according to the invention mounted on a handle; Figure 2 is a view in axial section, partially in elevation, of the push button of Figure 1 on a larger scale; Figure 3 is a diagrammatic elevation view of the push button alone on a small scale; Figure 4 is an elevation view of the end of the push button in the exit position, -the handle being free; Figure 5 is a diagrammatic view of a guide pin, the push but on being in the position of Figure 4; Figures 6 and 7 co&espand respectively to Figures 4 and 5 with the barrel depressed and the handle locked; Figure 8 is a sectional view of the unlocked handle along the line A in Figure 1; Figure 9 i a view in axial section of part of the sleeve; and Figure 10 is an end view of the sleeve.

The push button according to the invention 1 comprises a cylindrical sleeve 1 having a helical groove 10 terminating in a substantially' axiar offset 11. The groove 10 can be formed during the moulding of the sleeve 1 or can be machined. A barrel 2 equipped with locking tumblers 12 is seated in the sleeve 1 and is controlled by a key 13 which shifts said tumblers aside within the barrel 2 in a kngwn way.

An axial metal locking finger 3 is f astened to the barrel 2 by means of a pin 4, of which a projecting end forming a stud 14 is seated in the helical groove 10. A helical compression spring 5 returns the barrel towards it exit position (Figure.4; represented by dot-and-dash lines in Figures 1 and 2).

At its end opposite the finger 3, the sleeve 1 terminates in a widened inner bore 15 which thus f orms an exit zone f or the tumblers 12 when the barrel 2 has exited and the key 13 is extracted. The bore 15 is connected to diametrically opposed grooves 16 which are formed inside the sleeve 1 and which serve in a known way for the exit of the tumblers 12, when the barrel 2 is depressed and the key 13 extracted, by means of an inclined slope 17 (F igure---10) -1 R5eferably.at 45'.

The sleeve 1 is secured with a tight fit in a bivoting handle-lT, parallel to but offset from the pivot axis thereof, the finger 3 interacting in-a locking manner with aq.

a recess in the window frame 19 to be closed.

In the depressed position of the barrel 2, when the key 13 is removed, the tumblers 12 project in one of the grooves 16 or the other and the handle 18 is locked.

If the key 13 is inserted into the key channel, the tumblers 12 are shifted aside in the. barrel 2 and the handle 18 can be rotated. This rotation of the handle 18 give rise to a translational movement of the barrel 2 as a reSlt of the guidance of the stud 14 in the helical groove. 10. When the key 13)l. has pivoted as far as it will go through an angle a, for example of 400, the barrel 2, and with it the ocking f inger 3, has experienced a translational movement d. The handle 18 is rotationally free and the barrel 2 projects from the sleeve 1.

i 1 If, after the handle 18 has been returned to the closing position, the barrel 2 is depressed by pressing on the key 13, the barrel 2 experiences a simultaneous translational and rotational movement opposite to that just described. The tdmblers 12 shifted aside in the barrel 2 do not impede this movement. At the end of depression, the return spring 5 returns the stud 14 into the of f set 11 of - the groove 10, and the key 13 can be extracted, the tumblers 12 projecting in one of the grooves 16 or the other. The handle 18 is locked once again.

When the handle 18 has been released, as indicated above, the key 13 can be extracted, the tumblers 12 projecting in the widened portion 15 of the - sleeve 1. After the handle 18 has been returned to the closing position, the barrel 2 can once more be depressed counter to the action of the spring 5. In f act, during this depression, the tumblers 12 are returned progressively to the inside of the barrel 2 by means of the inclined slope 17. At the end of this depression, the tumblers 12 come opposite the grooves 16, into which they- are thrown by their return springs. The handle 18 is locked once more.

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Claims (4)

1. Push lock for a pivoting handle (18), of the type comprising a barrel (2) which can be set in rotation by means o f a coded key (13), said barrel (2) being seated coaxialry in a receptacle of said handle (18), being integral in terms of translational movement with a locking finger (3) and being returned by a spring (5), characterised in that said barrel (2) is seated in a sleeve (1) fastened in said handle (18), said barrel (2) having a radially projecting stud (14) interacting with a helical groove (10) of said sleeve (1), said groove terminating in a substantially axial offset (11), said barrel (2) being of the type with tumblers (12) returned by springs, said sleeve (1) having. groove means (16) for accommodatin g said tumblers (12) in their exit position and an end zone (15) for the exit of said tumblers-(12) - whidh isC0nnectEici to said aroove means (16) by means of dn inclined slope (17).

2. Push button according to Claim 1, characterised in that the stud (14) consists of a projecting end of a pin (4) for fastening the locking finger (3) to the barrel (2).

3. Push button according to one of Claims 1 and 2, characterised in that said end exit zone for the tumblers (12) consists of a widened inner bore (15) of the sleeve (1) -

4. A push lock substantially as herein describ-ed with reference to the accompanying drawings.