GB2200944A

GB2200944A - A fastener for a sash window or door

Info

Publication number: GB2200944A
Application number: GB08703162A
Authority: GB
Inventors: Colin Leslie Ridley
Original assignee: Hardware and Systems Patents Ltd
Current assignee: Hardware and Systems Patents Ltd
Priority date: 1987-02-11
Filing date: 1987-02-11
Publication date: 1988-08-17
Anticipated expiration: 2007-02-11
Also published as: GB2200944B; IE880219L; GB8703162D0

Abstract

The fastener 3 has a base plate 9 and a pivotal handle 6 the base plate 9 having a striker recess 15 to receive the nose 27 of a spring loaded striker 23 mounted in the handle. A key, operated barrel 7 is mounted for rotation in the handle 6 and the barrel 7 has a cam, recess 29 in which a projecting follower 28 of the striker 23 is received. When the barrel is in a first limit position with the follower 28 engaging abutment face 36 of recess 29 the striker nose 27 projects from the handle and can engage in the striker recess 15 to act as a latch to secure the handle 6 against rotation when the handle is enclosed over the base plate. When the barrel 7 is in the opposite limit position with the follower 28 engaging the abutment face 32 of recess 29, then the striker 23 is retracted into the housing 22 and is inoperative. As shown, fastener 3 is of cockspur type although it may be claw or hook fastener wherein handle is rotated to lift hook or claw from strike plate. Recess 15 has shoulders 16 with outer chamber faces 17. <IMAGE>

Description

Title LOCKING FASTENER FOR CASEMENTS OR FOR DOORS This inventions concerns fasteners for casements or for doors and is directed to a fastener having a special form of lockable arrangement to secure the fastener in a closed position.

It is already known to provide a wide range of locking devices for use with casements or doors which have to be fitted as an accessory for separate operation to secure the casement or door when required.

Some of these known locking devices have to be mounted on the stay or other fastener or handle to interfere with normal operation once the casement or door has been closed and locked by the device. However, many of these devices do not permit the casement or door to be secured in a night-vent position and many of the devices cannot operate automatically to secure the casement or door when brought into the closed position.

It is an object of this invention to provide a fastener having an integral lockable arrangement which enables a handle to be secured when in the closed position or which enables the handle to be automatically secured when brought into the closed position.

It is a further object of this invention to provide an improved form of fastener having a simple and compact lockable arrangement which is substantially tamper-proof and which may be set to be inoperative for normal non-lockable use of the fastener.

Other objects of this invention will be referred to later herein with reference to the more detailed description of the invention.

For convenience hereinafter, the term "casement" shall mean any sash, window or door that is arranged for movement relative to a frame, and there shall be no limitation on the direction or axis of hinging or supported movement of such defined casement relative to the frame. Thus, the term "casement" shall include various types and forms of windows or doors whether these be top or bottom or side hung or mounted for sliding movement.

According to this invention we provide a fastener for a casement (as defined), the fastener comprising a handle mounted on a base plate for pivotal movement between open and closed positions respectively for opening the casement and securing the casement in a closed position, the base plate having a striker rebate for receiving a striker mounted in the handle for spring loaded movement, a barrel mounted in the handle for rotation by a key adapted to be received within the barrel, the barrel member having a cam recess engaged by a follower on the striker, the cam recess having a profile such that when the barrel is rotated by the key to a first position, the striker can move under the spring bias in a direction parallel to the axis of rotation of the barrel for latching engagement with the striker rebate in the base plate when the handle is moved from the open to closed position, and the profile of the cam recess also being such that when the barrel is rotated by the key to a second position, the striker is held in a retracted position against the spring bias so that on moving the handle between open and closed positions the striker does not engage within the striker recess.

By such invented arrangement the fastener may be used in the normal manner without any locking or can be used to secure the handle to the base plate against opening movement by operation of the key. The .locking action can be preset by operating the key when the handle is in the open position and when the handle is brought into the closed position then the striker will enter the striker recess to secure the handle against opening movement. In addition, if it is required to secure the handle against opening movement when the handle is in the closed position, this may be done by operation of the key.

Preferably the base plate has chamfered shoulders on each side of the striker rebate to assist in the automatic latching and locking action of the striker when the handle is brought into the closed position with the locking action being preset.

Furthermore, it is also preferred that the striker is provided with a nose end that is received within the striker recess and this nose end is also chamfered to assist in the relative movement of the striker when engaging and riding over a shoulder on one side of the striker recess.

Conveniently, the striker is a member mounted in a housing provided in the handle for relative sliding movement with the follower being a projection from one side of the striker member which is received within the cam recess of the barrel. The projecting striker follower is arranged to engage a cam face of the cam recess under the influence of the spring force acting on the striker member so that on rotation of the barrel the relative movement of the striker is controlled and limited by the configuration of the cam recess. profile.

According to another preferred feature of this invention, the barrel has a lead-in access slot to one side of the cam recess and which can be aligned with the follower of the striker member when the barrel is in an assembly position remote from said first and second positions of the barrel. This arrangement facilitates easy assembly of the fastener.

Yet another feature of this invention is that the cam recess profile is arranged to limit rotation of the barrel by providing circumferentially spaced end faces that are engaged by the follower when the barrel is rotated to said first and second positions respectively.

The various features of the invention may be applied to a wide range of types of fasteners as well as being capable of being used in a wide range of styles or designs of handles. - Other features of the invention are referred to later herein.

An exemplary embodiment of this invention will now be described with reference to the accompanying drawings wherein FIGURE 1 is a schematic view of a casement in the closed position with respect to a frame with the invented fastener being shown in the closed and locked position; FIGURE 2 is a schematic view further to Figure 1 but showing the invented fastener in the open and preset locking position; and FIGURE 3 is another schematic view similar to Figure 2 but showing the fastener in the open and normal position wherein it cannot be locked.

FIGURE 4 is a detail scrap sectioned view taken generally on line 4'-4' shown in Figure 1 and including a key; FIGURE 5 is a further scrap sectioned view similar to Figure 4 but showing the assembly in the closed but normal position wherein it cannot be locked without use of the key; FIGURE 6 is an exploded isometric view of the main component parts but only showing part of the handle; and FIGURE 7 is an isometric detail view of the barrel component shown ina different position to that of Figure 6.

With reference first to Figures 1,2 and 3 of the drawings, there is.depicted a side hung casement 1 and a fixed frame 2. The casement 1 has a fastener 3 according to this invention mounted thereon, and the fastener 3 is of the cockspur type having a projecting spur 4 which is arranged to engage with or within a wedge plate 5 mounted on the frame 2 when the fastener is in the closed position as shown in Figure 1. In known manner, the wedge plate 5 may have a recess or slot in which the spur 4 can engage to hold the casement in a vent position.

With reference now also to the other Figures, the fastener 3 comprises a handle 6 that carries a barrel 7 for rotation by a key 8 for the locking action as to be later described. A base plate 9 mounts the handle 6 for pivotal movement by means of a spigot 10 projecting from the underside of the handle and which is received within a bore 11 in the base plate 9. A counterbore 12 on the underside of the plate 9 receives the free end of the spigot 10 which has a washer 13 mounted thereon with the end of the spigot 10 being peeved over to secure the handle 6 to the plate 9. In typical known manner, the base plate 9 is provided with through holes 14 which are countersunk for receiving screws (not shown) or the like for securing and fixing the fastener 3 to the casement 1.

The mounting plate 9 is formed with a striker recess 15 which is conveniently in this embodiment aligned partially with one of the fixing holes 14. The striker recess 15 is generally of rectangular shape in plan view and is bounded on the opposed sides in the arcuate direction of movement of the handle 6 by respective shoulders 16 each of which has an outer chamfer face 17.

The handle 6 has a closed bore 18 in which the barrel 7 is received and the barrel 7 is closed into the bore 18 by an annular bezel 19 that has a suitable underside lug (not shown) for location of the bezel in a keeper groove 20 extending axially on one side of the bore 18. The barrel 7 has a keyway 21 for receiving the key 8. The barrel 7 is mounted in the bore 18 for limited rotation by the key 8 as to be described.

The handle 6 is also formed with a housing 22 in the form of a pocket opening to the underside of the handle aligned with the striker recess 15 in the base plate 9 with the shape of the pocket being substantially complementary to a striker member 23 that is received therein -for relative sliding but nonrotating movement. The inner end of the housing 22 is formed with a small bore 24 and the adjacent inner end of the striker member 23 also has a similar small bore 25. A helical spring 26 is seated within the small bores 24 and 25 in order to apply a spring bias to the striker member 23 to urge it in a direction out of the pocket.The striker member has a nose end 27 having chamfered or inclined side faces which are arranged respectively to engage the chamfer faces 17 of the shoulders 16 at each side of the striker recess 15 into which the nose 27 of the striker member 23 is arranged to be received.

The striker member 23 has a follower 28 projecting from one side thereof facing or adjacent to the barrel 7. The follower 28 is arranged to be received in a cam recess 29 formed in the barrel 7 and the engagement of the follower 28 with faces of the cam recess 29 for mutual co-operation will now be described.

The cam recess 29 has an inclined lower face 30 which forms a ramp leading to a platform face 31. The cam recess 29 is closed adjacent to the platform face 31 by a end face 32 which extends in an axial direction and which provides an abutment face for engagement by the follower 28 to limit rotational movement of the barrel 7 in one sense.

An axial lead-in slot 33 is formed in the barrel 7 circumferentially spaced from the cam recess 29 and there is a short circumferential groove 34 connecting the slot 33 to the cam recess 29. This lead-in slot 33 and the short groove 34 are provided as an access way for the insertion and location of the follower 28 within the cam recess 29 during assembly. The cam recess 29 further includes an upper face 35 which is contiguous with the upper face of the groove 34 whilst the remaining sector of the barrel 7 between the leadin slot 33 and the cam recess 29 provides another end face 36 for engagement by the follower 28 to limit rotational movement of the barrel 7 in the opposed sense.

As will now be appreciated from the description of the component parts of the fastener, the striker member 23 may be located with the spring 26 in the housing 22 and to assemble the barrel for co-operation therewith, the barrel 7 is inserted in the bore 18 with the lead-in slot 33 aligned and in register with the follower 28. The striker member 23 can be depressed against the spring bias and the barrel 7 turned in an anti-clockwise sense so that the follower 28 first enters the lead-in slot 33 and then the short groove 34 until the barrel 7 is turned sufficiently for the follower 28 to be received within the cam recess 29.

When the barrel 7 is in the required position, it can be fixed and secured by the bezel 19.

Once the follower 28 is received within the cam recess 29 there is co-operating engagement between the striker 23 and the barrel 7.

Firstly, if the barrel 7 is turned by the key 8 in an anti-clockwise sense, then the follower 28 will engage the e;id face 36 preventing further movement of the barrel 7 in that sense and providing a first position for the barrel 7. In this first position of the barrel 7, the striker member 27 can slide axially relative to the pocket in the housing 22 under the spring bias and the striker member can act as a latch for engagement within the striker recess 15 of the base plate.

Secondly, if the barrel 7 is turned by the key 8 in a clockwise sense, then the follower 28 will ride up the ramp face 30 until it reaches the platform face 31 and engages the other end face 32. On such engagement the barrel 7 cannot be rotated in that sense any further and is in a second position. At this second position of the barrel 7, the axial position of the platform face 31 is such that the striker member 23 is caused to be retracted into the housing 22 against the spring bias and the nose 27 of the striker cannot engage within the striker recess 15 of the base plate 9.

In short, when the barrel 7 is rotated by the key 8 into the first position, the striker member 23 is in a latching and preset locking mode; and, when the barrel 7 is rotated by the key 8 into the second position, the striker member 23 is retracted into the handle and is inoperative until the key is turned into the first position.

The invented fastener with the special form of lockable arrangement provides various advantages as will be understood with reference to the schematic views as given in Figures 1,2 and 3. In Figure 1 the fastener is shown in the closed and locked position with the barrel being in the first position as just described. In this first position, the striker member is received in the striker recess and cannot be removed without turning the barrel into the second position by the key. In Figure 2 the fastener is shown in the open position, but the barrel is in the first position wherein the striker member is extended into the latching position so that as the handle is rotated into the closed position, then the striker nose will hit the chamfer face of the striker recess in the base plate and ride up over such face into engagement within the striker recess. Thus, on this mode of the fastener, the locking mechanism may be preset for the locking action when the handle is in the open position and on closing the fastener, it is automatically locked. The key need not be left in the barrel following rotation of the barrel into the first position.

Figure 3 shows the fastener in the open position with the barrel in the second position wherein the striker member is retracted into the handle and is maintained in this position so that the fastener can be used to secure the casement without using the locking feature. If desired at any time when the handle is in the closed position, the key can be used to rotate the barrel into the first position, and then the striker member will project into the striker recess and prevent any further movement of the handle until the key is used to rotate the barrel into the second position again.

Various advantages arise with this invented fastener as the key does not have to be left in the barrel and the assembly of the striker member and the barrel is tamperproof in use. As shown and described, the striker recess is formed with the shoulders on each side of the striker recess so that the same form of arrangement can be used for left or right hand opening pro.vide that the spur in a cockspur fastener is also correct for the selected handing.

The design and style of the handle can be to any desired type and the housing for the striker member may be an insert or shell inserted in a hollow or semihollow handle section. The striker member may be a plastics moulding and this has an advantage of low friction and silent operation.

The base plate can be to any suitable shape and style to suit the handle. The striker recess may be varied to suit the size and type of striker nose, and various alternatives for fixing holes may be provided or alternative secret forms of fixings may be accommodated. The base plate may be a plastics moulding.

The invention can be applied to other types of fasteners including claw or hook fasteners such as used for sliding doors and wherein the handle is rotated in use to release or lift the hook or claw from the strike plate. The principle applied in this invention is that the handle is prevented from rotating relative to its mounting or base plate.

Various further alternatives or modifications will be appreciated by those familiar with the design and operation of such fittings and furniture for windows and doors.

Claims

Claims:

1. A fastener for a casement (as defined), the fastener comprising a handle mounted on a base plate for pivotal movement between open and closed positions respectively for opening and securing the casement in a closed position, the base plate having a striker rebate for receiving a striker mounted in the handle for spring loaded movement, a barrel mounted in the handle for rotation by a key adapted to be received within the barrel, the barrel member having a cam recess engaged by a follower on the striker, the cam recess having a profile such that when the barrel is rotated by the key to a first position, the striker can move-under the spring bias in a direction parallel to the axis of rotation of the barrel for latching engagement with the striker rebate in the base plate when the handle is moved from the open to closed position, and the profile of the cam recess also being such that when the barrel is rotated by the key to a second position, the striker is held in a retracted position against the spring bias so that on moving the handle between open and closed positions the striker does not engage within the striker recess.

2. A fastener according to Claim 1 and wherein the base plate has a chamfered shoulder on one side of the striker rebate for engagement with the striker to assist in the automatic movement and latching action of the striker when the handle is moved from the open to the closed position with the barrel in the first position.

3. A fastener according to Claim 2 and wherein the base plate has a chamfered shoulder on each side of the striker rebate.

4. A fastener according to either Claim 2 or Claim 3 and wherein the striker is provided with a nose end for engagement within the striker rebate with the nose end being chamfered to assist in the relative movement of the striker when engaging and riding over the chamfered shoulder on one side of the striker rebate.

5. A fastener according to any one of the preceding Claims and wherein the striker is a member mounted in a housing provided in the handle, the striker member being mounted in the housing for relative axial movement with spring means within the housing acting on the striker member.

6. A fastener according to Claim 5 and wherein the follower is a projection extending from the side of the striker member with the projection being received within the cam recess of the barrel.

7.. A fastener according to Claim 6 and wherein the projecting striker follower is arranged to engage a cam face of the cam recess under the influence of the spring force acting on the striker member so that on rotation of the barrel the relative axial movement of the striker member is controlled and limited by the configuration of the cam face and cam recess profile.

8. A fastener according to Claim 7 and wherein the cam recess has a first end abutment face for engagement by the follower to limit rotational movement of the barrel is one sense.

9. A fastener according to Claim 8 and wherein the cam recess has a ramp face leading to a platform face adjacent to said first end abutment face whereby on rotation of barrel in said one sense the striker is displaced into the housing as the follower moves along the ramp face and the follower seats on the platform face thereby maintaining the striker member retracted into the housing so that the striker cannot engage within the striker rebate whilst the barrel is held in the limit position of the first end abutment.

10. A fastener according to Claim 10 and wherein the cam recess has a second end abutment face for engagement by the follower to limit rotational movement of the barrel in the opposite sense.

11. A fastener according to Claim 10 wherein said second end abutment face is at the bottom of said ramp face dnd extends axially.

12. A fastener according to any one of Claims 6 to 11 and wherein the barrel has a lead-in access slot to one side of and remote from the cam recess, and the lead-in access slot being for receiving the projecting striker follower on assembly of the fastener when the barrel is in an assembly position remote from the said first and second positions of the barrel.

13. A fastener according to Claim 12 and wherein the lead-in access slot comprises an entry axial portion and a circumferential groove portion opening into the cam recess.

14. A fastener according to Claim 13 and wherein the cam recess includes a face contiguous with one face of the groove portion to define one boundary of the cam recess in which the follower is received for operable movement of the striker as controlled by the barrel when in first or second positions.

15. A fastener for a casement (as defined) the fastener being substantially as hereinbefore described with reference to the accompanying drawings.