GB2191242A

GB2191242A - Window fastener

Info

Publication number: GB2191242A
Application number: GB08712217A
Authority: GB
Inventors: Jack Ernest Douglas
Original assignee: HASP INT Ltd
Current assignee: HASP INT Ltd
Priority date: 1986-06-04
Filing date: 1987-05-22
Publication date: 1987-12-09
Anticipated expiration: 2007-05-22
Also published as: GB8712217D0; GB2191242B

Abstract

A window fastener 1 having a lever handle assembly 2 comprising a base plate 6, a lever handle 8 mounted on the base plate 6 for pivotal movement about a pivot axis at one end of the handle 8 between fastened and unfastened positions for engagement and disengagement with a keeper 3 and, a security device 10 for securing the handle 8 in the fastened position. The security device 10 comprises a key-operated retractable bolt 17 movable parallel to the pivot axis to engage an aperture 9 in the other end of the handle 8 remote from the pivotted end and prevent pivotal movement of the handle 8. The bolt 17 is mounted in an upstand 11 integral with the base plate 6 thereby ensuring accurate alignment with the aperture 9 in the fastened position in which the apertured end of the handle 8 is received in a recess 19 in the upstand 11 to prevent upward movement of the handle 8. <IMAGE>

Description

SPECIFICATION Fastener This invention relates to fasteners for doors, windows and the like.

It is known to provide fasteners of the type in which a lever handle is mounted on a base plate for pivotal movement about a pivot axis at one end of the handle between fastened and unfastened positions with a security device coaxial with or adjacent to the pivot axis to secure the handle in the fastened position.

In such fasteners the end of the handle remote from the pivotted end is freely accessible rendering the fastener vulnerable to forced operation or removal from the mounting surface.

The present invention is intended to overcome the disadvantages afore-mentioned.

According to the present invention we provide a fastener for doors, windows and the like comprising a base plate adapted to be mounted on one of two relatively movable members, a lever handle mounted on the base plate for pivotal movement about a pivot axis at one end of the handle between fastened and unfastened positions, and a security device having a retractable locking element for securing the other end of the handle remote from the pivotted end in the fastened position to prevent pivotal movement of the handle.

The present invention solves the problem of forced operation or removal of the fastener from the mounting surface by securing the end of the handle remote from the pivotted end in the fastened position.

Furthermore, by the provision of a retractable locking element, the handle can be pivotted to and from the fastened position for normal operation of the fastener and secured in the fastened position when required.

The retractable locking element is preferably mounted for movement parallel to the pivot axis.

Preferably the locking element is adapted to be mounted on said one member for co-operating with the other end of the handle. For example, the locking element may be mounted in an upstand integral with the base plate thereby ensuring accurate alignment between the locking element and the other end of the handle in the fastened position. In this way fitment of the fastener is considerably simplified and facilitated.

Advantageously the locking element is movable between an advanced position at which the locking element is receivable in an aperture in the other end of the handle to prevent pivotal movement of the handle in the fastened position and a retracted position at which pivotal movement of the handle to and from the fastened position is permitted.

The locking element is conveniently guided between the advanced and retracted positions by guide means, for example a guide pin engaging a groove in the locking element. In this way smooth and reliable operation of the locking element is assured.

In one arrangement, the groove extends axially and the locking element is sprung loaded towards the advanced position and has respective abutment means at each end of the groove for engagement by the guide pin on rotation of the locking element by a key to retain the locking element in each of the advanced and retracted positions.

In another arrangement, the groove extends helically and the locking element is retained in the advanced position by a detent arranged to engage the locking element on removal of a key for rotating the locking element.

Other features and advantages of the invented fastener will be apparent from the following description of two exemplary embodiments with reference to the accompanying drawings in which: FIGURE 1 is a perspective view of a first embodiment of a fastener according to the present invention in combination with part of a casement window, the fastener being shown in the unfastened position; FIGURE 2 is an exploded isometric view of the security device of the fastener shown in Figure 1; FIGURES 3,4 and 5 are side views, partly in section, of the security device shown in Figure 2 in combination with the end of the handle illustrating the operation of the security device; FIGURE 6 is a perspective view of a second embodiment of a fastener according to the present invention in combination with part of a casement window, the fastener being shown in the unfastened position;; FIGURE 7 is an exploded isometric view of the security device shown in Figure 6; and FIGURES 8,9 and 10 are side views, partly in section, of the security device shown in Figure 7 in combination with the end of the handle illustrating the operation of the security device.

Referring first to Figures 1 and 6 of the accompanying drawings, two embodiments of a casement fastener 1,101 according to the present invention are shown each comprising a lever handle assembly 2,102 and a keeper 3,103.

The fasteners 1,101 are depicted in combination with part of a casement window comprising a glazed timber casement frame 4,104 mounted on a fixed timber frame 5,105 for opening and closing movement about a vertical hinge axis at one side of the window by any suitable hinge means (not shown).

Each lever handle assembly 2,102 includes a base plate 6,106 releasably secured to the casement frame 4,104 by screws 7,107 and a lever handle 8,108 mounted at one end on the base plate 6,106 by a pivot pin (not shown) for pivotal movement about a pivot axis normal to the base plate 6,106 between fastened and unfastened positions.

The other end of the handle 8,108 remote from the pivotted end is provided with a circular aperture 9,109 and each assembly 2,102 further includes a security device 10,110 mounted in an upstand 1 1,1 1 1 integral with the base plate 6,106 for co-operating with the aperture 9,109 to secure the handle 6,106 in the fastened position.

Each keeper 3,103 has a mounting base 12,112 releasably secured to the fixed frame 5,105 by screws 13,113 and an integral tongue 14,114 which projects from the mounting base 12,112 for engagement with the underside of the handle 8,108 in the fastened position to secure the casement frame 4,104 in closed weathertight sealing engagement with a rebated portion 15,115 of the fixed frame 5,105 or for reception in a transverse slot 16,116 in the pivotted end of the handle in the fastened position to secure the casement frame 4,104 in a partially open "vent" position relative to the fixed frame 5,105.

The security device 10 of the first embodiment will now be described in more detail with reference to Figures 2 to 5.

The security device 10 comprises a locking element in the form of a cylindrical bolt 17 mounted in a complementary bore 18 formed in the upstand 11 and extending substantially parallel to the pivot axis.

The bore 18 opens at one end into a transverse channel-section recess 19 in the upstand 11 and is closed at the other end.

The apertured end of the handle 8 is received in the recess 19 in the fastened position in which the aperture 9 is aligned with the bore 18 and with a circular hole 20 in the overlying upper end of the upstand 11.

In this way the handle 8 is retained by the upstand 11 against upward movement away from the base plate 6 for added security against forced removal of the handle assembly 2 from the casement frame 4 by pulling on the handle 8 in the fastened position.

A spring 21 positioned between the closed end of the bore 18 and the bolt tail 22 biasses the bolt 17 to an advanced position in which the bolt head 23 projects across the recess 19 into the aligned hole 20 in the upper end of the upstand.

The bolt 17 is retractable from the advanced position against the biassing of the spring 21 to a retracted position in which the bolt head 23 projects slightly from the open end of the bore 18 into the recess 19.

Mounted in a transverse bore 24 in the upstand 11 is a fixed guide pin 25 one end of which projects into the bore 18 and engages an axially extending groove 26 formed in the outer surface of the bolt 17 to guide the bolt 17 between the advanced and retracted positions and to limit outward movement of the bolt 17 under the biassing of the spring 21.

Formed in the outer surface of the bolt 17 at one end of the axial groove 26 is a circumferentially extending groove 27 that is engaged by the guide pin 25 on rotation of the bolt 17 in the advanced position to retain the bolt 17 in the advanced position.

Formed in the outer surface of the bolt 17 at the other end of the axial groove 26 is a circumferentially extending abutment shoulder 28 that is engaged by the guide pin 25 on rotation of the bolt 17 in the retracted position to retain the bolt 17 in the retracted position while allowing the bolt 17 to be depressed further against the resilient biassing of the spring 21 for a purpose described later.

The circumferential groove 27 and abutment shoulder 28 each extend over approximately 1800 and terminate in respective end stops (not shown) that are engaged by the guide pin 25 to limit rotation of the bolt 17 in each of the retracted and advanced positions to a common angular position at which an axial keyway 29 formed in the bolt 17 is aligned with a complementary opening 30 in a fixed escutcheon 31 mounted in the hole 20 to permit insertion and removal of a complementary shank 32 of a matching key 33 for rotating the bolt as above-described.

In this way, operation of the security device 10 by a non-matching key is prevented. As an added security feature the bolt 1 7 may incorporate a lock (not shown) to lock the bolt 17 against rotation on removal of the key 33.

The aperture 9 in the end of the handle is bounded on the underside by a reverse taper 34 which co-operates with a taper 35 at the end of the bolt head 23 in the retracted position of the bolt 17 to depress the bolt 17 against the bias of the spring 21.

As a result, pivotal movement of the handle 17 to and from the fastened position is permitted in the retracted position of the bolt 17 and the bolt 17 acts as a spring catch to engage and disengage the aperture 9 automatically.

In this way, the apertured end of the handle 8 is located and held in the fastened position but is not secured and the handle 8 can be pivotted to the unfastened position when required.

To secure the handle 8 in the fastened position against pivotal movement, the key shank 32 is inserted in the key-way 29 and the bolt 17 rotated to align the guide pin 25 with the axial groove 26 whereupon the bolt 17 is moved automatically to the advanced position under the bias of the spring 21 in which the bolt head 23 projects through the aperture 9.

The bolt 17 is retained in the advanced position by rotating the bolt 17 to engage the guide pin 25 in the circumferential groove 27 until the end stop is reached whereupon the key shank 32 may be removed from the keyway 29.

To release the handle 8 for pivotal move ment to and from the fastened position as above-described, the key shank 32 is inserted in the key-way 29 and the bolt 17 rotated to align the guide pin 25 with the axial groove 26 whereupon the bolt 17 is manually depressed against the bias of the spring 21 to the retracted position. The bolt 17 is retained in the retracted position by rotating the bolt 17 to engage the guide pin 25 with the abutment shoulder 28 until the end stop is reached whereupon the key shank 32 may be removed from the key-way 29.

The security device of the second embodiment will now be described in more detail with reference to Figures 7 to 10 of the accompanying drawings.

The security device 110 comprises a locking element in the form of a cylindrical bolt 117 mounted in a complementary bore 118 formed in the upstand 111 and extending substantially parallel to the pivot axis.

The bore 118 opens at one end into a recess 119 in the upstand 111 and the other end is closed.

The apertured end of the handle 108 is received in the recess 119 in the fastened position in which the aperture 109 is aligned with the bore 118.

Additionally, in the fastened position, an undercut ledge 120 at the upper end of the upstand 111 co-operates with a lip 121 at the free end of the handle 108.

In this way the apertured end of the handle 108 is retained by the upstand 111 against upward movement away from the base plate 106 for added security against forced removal of the handle assembly 102 from the casement frame 104 by pulling on the handle 108 in the fastened position.

The bolt 117 has an axial key-way 122 in which a complementary shank 123 of a matching key 124 may be inserted for rotating the bolt 117 and a helical groove 125 in the outer surface in which one end of a fixed guide pin 126 mounted in a transverse bore 127 in the upstand 111 is received.

By this arrangement the bolt 117 is displaced axially in the bore 118 on being rotated by the key 124 between a retracted position in which the bolt head 128 is substantially flush with the open end of the bore 118 and an advanced position in which the bolt head 128 projects from the bore 118.

The advanced and retracted positions are defined by the engagement of the guide pin 126 with the opposed ends of the groove 125 and the displacement of the bolt 11 7 is determined by the axial extent of the groove 125.

The key-way 122 extends to the outer surface of the bolt 117 and, on insertion of the key 124, the planar outer edge of the key 124 lies flush with the outer surface of the bolt 117.

Extending from the inner end of the key-way 122, the bolt 117 is cut-away to form an axially extending rectangular cavity 129 in the outer surface of the bolt 117 which terminates short of the outer end of the key-way 122.

Mounted in an axially extending rectangular socket 130 formed in the bore 118 intermediate the ends thereof is a detent in the form of a leaf spring 131.

The leaf spring 131 has a first arm 132 seated on the base of the socket 130 and a shorter second arm 133 inclined relative to the first arm 132 and resiliently displaceable relative thereto.

In the retracted position of the bolt 117, the second arm 133 of the spring 131 engages the outer surface of the bolt 117 and is resiliently compressed thereby such that the bolt 117 is frictionally held in the retracted position permitting pivotal movement of the handle 108 to and from the fastened position.

To secure the handle 108 in the fastened position against pivotal movement, the key shank 123 is inserted in the key-way 122 and the bolt 117 rotated to move the bolt 117 to the advanced position in which the bolt head 128 is received in the aperture 109.

In the advanced position, the cavity 129 and socket 130 are aligned and the resilient compression of the second arm 133 of the spring 130 is maintained by the planar edge of the key-shank 123 in the key-way 122 such that, on removal of the key-shank 123, the second arm 133 expands to engage automatically in the cavity 129 to retain positively the bolt 117 in the advanced position preventing pivotal movement of the handle 108.

To release the handle 108 for pivotal movement to and from the fastened position as above-described, the key-shank 123 is inserted in the key-way 122 to disengage the second arm 133 of the spring 131 from the cavity 129 and the bolt 117 rotated to move the bolt 11 7 to the retracted position in which the bolt head 128 is positioned in the bore 118 disengaged from the aperture 109. In this way operation of the security device 110 by a non-matching key is prevented.

It will be understood that the exemplary embodiments above-described may be modified without departing from the scope of the inventive concept of a security device having a retractable locking element operable to secure the end of the lever handle remote from the pivotted end in the fastened position.

Thus the fastener may be of the wedge type described in which the keeper has a projecting tongue for engagement with the handle or of the cockspur type in which the handle has a projecting nib, tongue or like formation for engagement with the keeper. In both types, the engagement between the handle and keeper may secure the members closed and/or in one or more vent positions.

As an alternative to or in addition to en gagement with the keeper, the handle may be coupled to a spindle for actuating a locking mechanism such as an espagnolette.

The upstand in which the locking element is mounted may be integral with the base plate or separate therefrom.

The guide pin may be on the locking element and the groove formed in the wall of the bore. Any other suitable guide means may be provided.

The key for operating the locking element may be of any suitable size and shape as may the keyway in the locking element.

The lever handle assembly may be mounted on either the closure member as described or the fixed frame.

The locking element of the second embodiment may be sprung loaded towards the advanced position and retained in the retracted position by the engagement of the guide pin in a circumferential end portion of the helical groove. Such circumferential end portion may be constructed to permit the locking element to engage and disengage the aperture in the handle automatically as described for the first embodiment.

The locking element of the first embodiment may be secured against rotation on removal of the key in the advanced position by a detent as described for the second embodiment.

The upstand may have any suitable formation for co-operating with the end of the handle in the fastened position to prevent upward movement of the handle to disengage the locking element and/or forcibly remove the handle assembly. Alternatively, the formation may be omitted.

In each of the above embodiments, the locking element is mounted on the base plate for co-operating with the apertured end of the handle and it will be appreciated that the locking element could equally be mounted at the end of the handle remote from the pivotted end for co-operating with an aperture in the frame member on which the handle is mounted or a part mounted thereon, for example the base plate or a separate retainer.

In such alternative arrangement it is envisaged that the handle would have a thickened portion at the end similar to the upstand on the base plate in which the locking element would be mounted for movement parallel to the pivot axis by either of the pin and groove arrangements previously described or any other suitable means.

Finally, while the invention has been described with reference to a fastener for a window, it will be understood that the invention has application to doors and like closure members mounted for hinged, pivotal or sliding movement relative to a frame member.

Claims

1. A fastener for doors, windows and the like comprising a base plate adapted to be mounted on one of two relatively movable members, a lever handle mounted on the base plate for pivotal movement about a pivot axis at one end of the handle between fastened and unfastened positions, and a security device having a retractable locking element for securing the other end of the handle remote from the pivotted end in the fastened position to prevent pivotal movement of the handle.

2. A fastener according to Claim 1 wherein the retractable locking element is mounted for movement parallel to the pivot axis.

3. A fastener according to Claim 1 or Claim 2 wherein the locking element is operable by a key.

4. A fastener according to any one of the preceding Claims wherein the retractable locking element is adapted to be mounted on said one member for co-operating with said other end of the handle in the fastened position.

5. A fastener according to Claim 4 wherein the locking element is movable between an advanced position at which the locking element is receivable in an aperture in the other end of the handle to prevent pivotal movement of the handle in the fastened position and a retracted position at which pivotal movement of the handle to and from the fastened position is permitted.

6. A fastener according to Claim 5 including guide means for guiding the locking element between the advanced and retracted positions.

7. A fastener according to Claim 6 wherein the guide means comprises an axial groove in the locking element in which a fixed guide pin is received.

8. A fastener according to Claim 7 wherein the locking element has respective abutment means at each end of the axial groove for engagement by the guide pin on rotation of the locking element to retain the locking element in each of the advanced and retracted positions.

9. A fastener according to Claim 8 wherein the locking element is rotatable to a common angular position in each of the advanced and retracted positions at which insertion and removal of a key for rotating the locking element is permitted.

10. A fastener according to any one of Claims 5 to 9 wherein the locking element is resiliently biassed towards the advanced position.

11. A fastener according to Claim 10 wherein the aperture is bounded by a surface for co-operation with the locking element in the retracted position to move the locking element against the resilient biassing to engage and disengage automatically the locking element in the aperture.

12. A fastener according to Claim 6 wherein the guide means comprises a helical groove in the locking element in which a fixed guide pin is received.

13. A fastener according to Claim 12 wherein the locking element is retained in the advanced position by a detent.

14. A fastener according to Claim 13 wherein the detent is arranged to engage and disengage the locking element on removal and insertion of a key for rotating the locking element.

15. A fastener according to any one of the preceding Claims wherein the locking element is mounted in an upstand integral with the base plate.

16. A fastener according to Claim 15 wherein the upstand has a recess in which the other end of the handle is received in the fastened position.

17. A fastener according to Claim 15 or Claim 16 wherein the upstand has a formation for co-operating with the other end of the handle in the fastened position to prevent upward movement of the handle relative to the base plate.

18. A fastener according to Claim 1 or Claim 2 wherein the retractable locking element is mounted on said other end of the handle for co-operating with the other of said two relatively movable members or a part associated therewith.

19. A fastener according to any one of the preceding Claims wherein the locking element comprises a bolt.

20. A fastener according to any one of the preceding Claims including a keeper adapted to be mounted on the other of said two relatively movable members, the handle being engageable with the keeper in the fastened position to secure the members relative to one another.

21. A fastener according to Claim 20 wherein the handle is engageable with the keeper to secure the members closed.

22. A fastener according to Claim 20 or Claim 21 wherein the handle is engageable with the keeper to secure the members in a vent position.

23. A fastener for doors, windows and the like substantially as hereinbefore described with reference to Figures 1 to 5 of the accompanying drawings.

24. A fastener for doors, windows and the like substantially as hereinbefore described with reference to Figures 6 to 10 of the accompanying drawings.

25. A fastener according to any one of the preceding Claims in combination with a door.

26. A fastener according to any one of Claims 1 to 24 in combination with a window.