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Title:
A RESTRICTOR FOR A WINDOW OR A DOOR
Document Type and Number:
WIPO Patent Application WO/2019/161973
Kind Code:
A1
Abstract:
A restrictor for a window or a door comprises a first connector (10) adapted to be secured to a frame or sash of the window or door and a second connector (3) adapted to be secured to the other of the frame or sash. A cable or link (6) is secured at one end to the second connector (3) and has a spigot (11) secured to its other end. A lock (13) is housed within the first connector (10) and defines a channel (12) that receives the spigot (11). The lock (13) comprises a movable locking member (19) that in a first position engages the spigot (11) to lock the spigot (11) within the channel (12) and that is movable into a second position to unlock the spigot (11) allowing its withdrawal from the channel (12). The movable locking member (19) is biased into its first position and moved into its second position against the force of the bias (26) by the spigot (11) on its insertion into the channel (12). Movement of the spigot (11) further into the channel (12) releases the locking member (19) to return to its first position under the influence of its bias (26) wherein it engages the spigot (11) to secure it in the channel (12) of the lock (13). Hence, the restrictor of the invention may always be deployed to restrict window or door opening as no key is required to lock the cable to the first connector via the spigot.

Inventors:
MCLOUGHLIN, John (Unit 1 Albert Close Trading Estate,Whitefiel, Manchester M45 8EH, GB)
CHANEY, Stephen (Unit 1 Albert Close Trading Estate,Whitefiel, Manchester M45 8EH, GB)
Application Number:
EP2019/025046
Publication Date:
August 29, 2019
Filing Date:
February 18, 2019
Export Citation:
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Assignee:
UAP LIMITED (Unit 1, Albert Close Trading EstateWhitefiel, Manchester M45 8EH, GB)
International Classes:
E05C17/36
Domestic Patent References:
WO2014108680A12014-07-17
WO2017160261A12017-09-21
Foreign References:
GB995017A1965-06-10
EP2418343A22012-02-15
EP3034729A12016-06-22
Other References:
None
Attorney, Agent or Firm:
BRAY, Lilian Janet (L. J. Bray & Co, Raw Holme Midgehole Road,Hebden Bridg, West Yorkshire HX7 7AF, GB)
Download PDF:
Claims:
CLAIMS

1. A restrictor for a window or a door comprising

a first connector adapted to be secured to a frame or sash;

a second connector adapted to be secured to the other of the frame or sash;

a cable or link secured at one end to the second connector and having a spigot secured to its other end;

a lock housed within the first connector, the lock defining a channel that receives the spigot and comprising a movable locking member that in a first position engages the spigot to lock the spigot within the channel and that is movable into a second position to unlock the spigot by allowing its withdrawal from the channel ;

characterised in that the movable locking member is biased into its first position and moved into its second position against the force of the bias by the spigot on its insertion into the channel, movement of the spigot further into the channel releasing the locking member to return to its first position under the influence of its bias wherein it engages the spigot to secure it in the channel of the lock.

2. A restrictor as claimed in Claim l, wherein the spigot defines a groove in which the locking member engages to secure the spigot within the channel but has a profiled free end that acts on a part of the locking member on insertion of the spigot into the channel to move the locking member against the force of the bias.

3. A restrictor as claimed in Claim 2, wherein the locking member comprises a sliding plate which defines a shaped edge that has a profile complementary to that of the groove and that engages in the groove to secure the spigot in the channel. A restrictor as claimed in Claim 3, wherein the shaped edge of the sliding plate is part circular and engages in part of an annular groove defined by the spigot. 5 A restrictor as claimed in Claim 3 or Claim 4, wherein the profiled free end of the spigot is chamfered and acts on the shaped edge of the sliding plate, which is chamfered in a direction complementary to the chamfered free end of the spigot, on insertion of the spigot into the channel.

A restrictor as claimed in any of Claims 3 to 5, wherein the lock comprises a rotatable plug that comprises an eccentrically located projection which locates within a slot defined by the sliding plate whereby rotation of the plug moves the sliding plate linearly from its first position into its second position.

7. A restrictor as claimed in Claim 6, wherein the plug is rotatable in the lock by means of a removable key. 8. A restrictor as claimed in Claim 6 or Claim 7, wherein the sliding plate is biased into its first position by a torsion spring located between and connected to the rotatable plug and a casing of the lock.

A restrictor as claimed in Claim 8, wherein the torsion spring also acts as a compression spring to bias the plug into contact with sliding plate to retain the projection within the slot.

10. A restrictor as claimed in Claim 8 or Claim 9, wherein the sliding plate comprises a projection that bears against a fixed part of the restrictor when the sliding plate is in its first position and thereby pre-loads the torsion spring.

Description:
A RESTRICTOR FOR A WINDOW OR A DOOR

The present invention relates to a restrictor for a window or a door and, in particular, to a cable restrictor.

Window restrictors are used to prevent the sashes of opening windows, in particular casement, awning and pivot windows, from being opened sufficiently wide that a child may fall through the window. They may also be used on doors and references herein to a window should be understood as including the possibility for use of the restrictor on a door.

A safe limitation on the width of an open window is around loo mm. To this end, cable window restrictors usually comprise a 200 mm cable that is secured at one end to a first connector adapted to be secured to a window frame and that is secured at its other end to a spigot that can be inserted into and secured by a lock, which is located in a second connector adapted to be secured to the window sash. When the spigot is secured by the lock, opening of the window is limited to a distance dictated by the length of the cable, which is usually to around too mm. Conventionally, a key must be used to lock and unlock the lock to secure or to release the spigot in or from the lock.

It is an object of the present invention to provide a restrictor for a window or a door wherein a spigot attached to a cable or link of such a restrictor can be secured to a lock of the restrictor without the use of a key. This means that the restrictor of the invention may always be deployed to restrict window or door opening even if the user does not have a key thereby increasing the utility of the restrictor and increasing its safety capabilities.

According to the present invention there is provided a restrictor for a window or a door comprising

a first connector adapted to be secured to a frame or sash;

a second connector adapted to be secured to the other of the frame or sash; a cable or link secured at one end to the second connector and having a spigot secured to its other end;

a lock housed within the first connector, the lock defining a channel that receives the spigot and comprising a movable locking member that in a first position engages the spigot to lock the spigot within the channel and that is movable into a second position to unlock the spigot by allowing its withdrawal from the channel;

characterised in that the movable locking member is biased into its first position and moved into its second position against the force of the bias by the spigot on its insertion into the channel, movement of the spigot further into the channel releasing the locking member to return to its first position under the influence of its bias wherein it engages the spigot to secure it in the channel of the lock.

Preferably, the spigot defines a groove in which the locking member engages to secure the spigot within the channel but has a profiled free end that acts on a part of the locking member on insertion of the spigot into the channel to move the locking member against the force of the bias.

Other preferred but non-essential features of the present invention are described in the dependent claims appended hereto.

The present invention will now be described by way of example with reference to the accompanying drawings, in which: -

Fig. l is a view of a conventional cable window restrictor when in use;

Fig. 2 is a front view of a connector forming part of a window restrictor in accordance with the present invention;

Fig. 3 is an exploded perspective view of the connector shown in Fig. Fig. 4 is an exploded side view of the connector shown in Fig. 2;

Fig. 5 is a rear view of the interior of the connector with a back plate forming part thereof removed;

Fig. 6 is a longitudinal sectional view of the connector along the line VI-VI in Fig, 5 but with a spigot of a cable or link forming part of the restrictor inserted into a channel defined by a lock;

Fig. 7 is a view similar to Fig. 6 but showing the spigot when located further into the channel; and

Fig, 8 is a view similar to Figs. 6 and 7 but showing the spigot fully located in the channel.

A conventional cable window restrictor 1, as shown in Fig. 1, is used to restrict the opening of the window or door to which it is fitted. Typically, opening is restricted to less than 100mm, which prevents children being able to fit through the gap but is wide enough to allow enough air to circulate around a room. The restrictor 1 comprises first and second connectors 2 and 3 that are adapted to be secured respectively to a window frame 4 and to a sash 5 respectively. A cable 6 is secured at one end to the second connector 3 and has a spigot arrangement 7 secured to its other end. The first connector 2 houses a lock 8 with a channel that receives a spigot of the spigot arrangement, as shown in Fig. 1, and that is adapted to lock the spigot within the channel. A key 9 is used to open or close the lock 8, opening of the lock 8 permitting the spigot to be withdrawn from the channel so that spigot arrangement 7 is no longer connected to the first connector 2 and the window or door can be opened wider than permitted by the cable 6.

Turning now to the present invention, this is similar to the arrangement shown in Fig. 1 except that the first connector 2 is replaced by a differently constructed connector 10, as is described below, which secures and locks a spigot n in a channel 12 of a lock 13 housed in the connector 10 simply by pushing the spigot 11 into the channel 12 of the lock 13. Hence, no key is required to lock the spigot 11 in place. A key is only required to unlock the lock 13 so that the spigot 11 can be withdrawn therefrom to unfasten the cable 6 attached thereto from the connector 10. In other respects, the window restrictor of the present invention is similar to the prior art in that it comprises a second connector 3, a cable 6 or other appropriate link and a spigot arrangement 7.

The connector 10 will now be described in further detail with reference to Figs. 2 to 8.

With reference to Figs 2 to 5, the connector 10 comprises a back plate 14, which is adapted to be secured to a window frame or sash by means of screws, a shroud 15 that convers the back plate 14 and houses the lock 13. The lock 13 comprises a casing 16 that defines the channel 12, which receives the spigot 11, as shown in Figs. 6 to 8, and a keyway 17, into which a key (not shown) is inserted when it is desired to unlock the lock 13. The spigot 11 forming part of a spigot arrangement 18 is similar to the arrangement 7 shown in Fig. 1, a cable that is secured to the arrangement 18 being omitted from Figs. 6 to 8 of the drawings.

The lock 13 comprises a movable locking member that preferably takes the form of a sliding plate 19, which in a first position engages the spigot 11 to lock the spigot 11 within the channel 12 and is movable into a second position when the lock 13 is unlocked to allow withdrawal of the spigot 11 from the channel 12. The spigot 11 defines a groove 20 in which the sliding plate 19 engages when it is secured within the channel 12. The groove

20 is preferably annular and the sliding plate 19 defines a shaped edge 21 that has a profile complementary to that of the groove 20. However, it will be appreciated that in other embodiments the groove 20 and the edge 21 may have other complementarily-shaped profiles. In this embodiment, the edge

21 is also profiled or chamfered as at 22 so that it tapers in a direction towards the front of the connector 10. The reason for the chamfer 22 is described below.

The sliding plate 19 also defines a slot 23 in which is located a projection 24 that extends eccentrically from one side of a rotatable plug 25. The plug 25 defines the keyway 13 and is rotatable by a key inserted into the keyway 13 in order to unlock the lock 13. The plug 25 is spring-loaded on its opposite side to the sliding plate 19 by a spring 26 that is located between the plug 25 and the lock casing 16. The compressive force of the spring 26 is such that it ensures that the sliding plate 19 is kept firmly against the surface of the back plate 14, which is recessed to accommodate the sliding plate 19 therein. The ends 27 of the spring 26 are bent outwards, typically at angles between 70° to ioo° and preferably at 90°, to the main spiralling body of the spring 26 and respectively engage in a channel 28 defined in the edge of the plug 25 and in an aperture (not shown) defined by the lock casing 16. In this way, the spring 26 can be twisted so that it not only acts as a compression spring biasing the plug 25 into contact with the sliding plate 19 and thereby retaining the projection 24 within the slot 23 but also acts as a torsion spring that biases the sliding plate 19 into its first position. It will be appreciated in this regard that when the plug 25 is rotated the eccentrically located projection 24 travels along the slot 23 and thereby moves the sliding plate 19 between its first and second positions.

When the spring 26 is under no externally applied torsional force, the sliding plate 19 is retained in its first position, which is as shown in Fig. 8. Here the sliding plate 19 is in a locked position wherein it can engage the spigot 11 when this has been inserted into the channel 12, as shown in the drawing. In this position, the shaped edge 21 of the sliding plate 19 projects into the channel 12 regardless of whether the spigot 11 is present in the channel or not but in the former case it will be appreciated that the plate 19 retains the spigot 11 within the channel 12 and prevents it from being pulled out. However, if the plug 25 is rotated by means of key inserted into the keyway 17, then the projection 24 moves along the slot 23 to move the sliding plate 19 away from the channel 12 against the bias of the spring 26 into its second position so that the shaped edge 21 no longer projects into the channel 12. This moves the shaped edge 21 out of the groove 21 in the spigot 11 if the spigot is present and thereby unlocks the spigot 11 enabling it to be withdrawn from the channel 12.

In addition to the foregoing, the sliding plate 19 comprises a projection 29 that projects from the side of the sliding plate 19 adjacent the back plate 14 between the shaped edge 21 and the slot 23. When the sliding plate 19 is in its first position, the projection 29 bears against an inwardly projecting lip 30 of the back plate 14 that is formed around an aperture 31 in the back plate 14 into which a nose 32 of the spigot 11 extends when it is locked within the connector 10. Abutment of the projection 29 against the lip 30, which is a fixed part of the restrictor 10, causes a degree of torsional pre load on the spring 26 while ensuring consistency of the position of the sliding plate 19 relative to the nose 32 of the spigot 11. The degree of pre-load on the spring 26 can be arranged to provide an optimal balance between ease and positivity of the locking action. The degree of pre-load is also adjustable by varying the geometry and material properties of the spring 26.

While the plug 25 can be rotated by a key to move the sliding plate 19 into its unlocked position to permit the spigot 11 to be fully inserted into the channel 12 and then locked thereto by allowing the sliding plate 19 to move back into its first position, the connector 10 is adapted to permit locking of the spigot 11 within the channel 12 without the need to use a key to rotate the plug 25. This can occur because the shaped edge 21 of the sliding plate 19 is profiled or chamfered as described above. This chamfer 22 is complementary to a profiling or chamfer 33 formed on the nose 32 of the spigot 11. Such a chamfer 33 is usually present in conventional window restrictors as it facilitates location of the spigot 11 within the channel of the lock. However, in the present invention it is used in conjunction with the design of the connector 10 to enable the spigot 11 to move the sliding plate 19. Referring to the drawing sequence comprising Figs. 6 to 8, it can be seen in Fig, 6 that on first insertion of the spigot n into the channel 12, the nose 32 of the spigot 11 contacts the shaped edge 21 of the sliding plate 19, which is in its first position. The complementarily shaped chamfers 33 and 22 on the spigot 11 and the shaped edge 21 respectively now abut one another and if the spigot 11 is pushed further into the channel, as shown in Fig, 7, the chamfer 33 on the spigot 11 rides over the chamfer 22 on the sliding plate 19 and pushes the plate 19 out of the channel 12 against the torsional force of the spring 26. When the spigot 11 is pushed further into the channel 12, as shown in Fig. 8, then the annular groove 20 moves over the end of the channel and the sliding plate 19 is no longer restrained by the nose 30 of the spigot 11. When this occurs the sliding plate 19 is moved back into its first position under the influence of its bias, in which position its shaped edge 21 engages within the groove 20 thereby securing the spigot 11 within the channel 12. Control over the degree of force required to push the spigot 11 into its locked position is achieved by choice of the bevel angles creating the chamfers 22 and 33 an d well as by the geometry and material properties of the spring 26.

Unlocking of the connector 10 by use of a key (not shown) inserted into the keyway 17 rotates the plug 25 against the bias of the spring 26 so that the sliding plate 19 is retracted from the groove 20 in the spigot 11. This puts the connector into the condition shown in Fig. 7 wherein the spigot 11 can be withdrawn from the channel 12.

Hence, the window restrictor of the present invention permits a cable or other link secured to the spigot arrangement 18 to be secured to the connector 10 without use of a key, which is only required to unlock the connector 1. In this regard, the position of the spring 27 will be arranged so that when the spigot 11 is locked within the channel 12, keyway 17 in the plug 25 is correctly aligned to accept the key.