NZ300040A - Window stay comprises sash mounting plate attached to carriage that slides in channel shaped frame mounting plate - Google Patents

Description

3 0 Go 4 0 New Zealand No. 300040 International No.

TO BE ENTERED AFTER ACCEPTANCE AND PUBLICATION Priority dates: 24.01.1995; Complete Specification Filed: 24.01.1996 Classification:^) E05D15/30,44 Publication date: 27 April 1998 Journal No.: 1427 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of Invention: A window stay Name, address and nationality of applicant(s) as in international application form: INTERLOCK INDUSTRIES LIMITED, a New Zealand company of Portsmouth Road, Miramar, Wellington 6003, New Zealand 1 ft winppw stay BACKGROUND OF THE INVENTION This invention relates to a window stay.

A window stay is a piece of hardware by which a window sash can be hingedly mounted within a window frame. The term "window stay" is broadly used to indicate a hinge for 10 hingedly mounting a sash in a window frame but not necessarily itself hold the window sash in an adjusted open position. Thus while in the preferred form of the invention as described herein the window stay serves the purpose of hingedly mounting the window sash in a frame it does not 15 itself hold the sash in an adjusted open position. However, by incorporating friction in, say, at least one pivot joint the stay can be capable of holding the window sash in an adjusted open position.

Typically a window sash is mounted into a window frame by a pair of window stays in the factory of the window manufacturer. However, there are situations where a window installer may wish ,to be able to fit a window sash to a window frame on the building site. This, however, requires 25 the window installer to install the frame and sash mounting plates using fixing methods or special tools. 2 SUMMARY OF THE INVENTION The object of the present invention is to provide a window stay having a construction which enables a window installer 5 to be able to readily and easily fit a window sash to a window frame at a building site.

Broadly in one aspect of the invention there is provided a frame mounting plate, a sash mounting plate, an arm pivotally 10 coupled to the sash mounting plate, a carriage guide extending longitudinally of the frame mounting plate, a carriage slidingly mounted with the carriage guide to be movable along the frame mounting plate, said sash mounting plate being pivotally coupled to the carriage, and said arm 15 being pivotally coupled to a mounting means which is clip mountable to the frame mounting plate.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of the window stay according to one preferred embodiment in the fully closed position, Figure 2 is an end elevation view of the window stay in the full closed position, Figure 3 is a perspective view of the window stay in the » fully opened position, 3 Figure 4 is a view similar to Figure 3 but showing the window stay prior to final assembly, Figure 5 is a top perspective view of an end clip for mounting the arm of the window stay to the frame 5 mounting plate, Figure 6 is an underside perspective view of the end clip, and Figure 7 is a cross-section view through a screw hole of the frame mounting plate. 0 DESCRIPTION OF THE PREFERRED EMBODIMENTS The window stay according to the present invention is typically referred to as a "two bar" stay. As a consequence 15 the stay comprises a frame mounting plate 10, a sash mounting plate 11 and a single arm 12 coupled between plates 10 and 11. Thus arm 12 is coupled at one end to the sash mounting plate 11 via a pivot 13. Openings 14 are provided in the sash plate 11 to also facilitate mounting to the window sash by a 20 screw or the like passing therethrough.

The sash mounting plate 11 is mounted via pivot 15 to a flange 24 of a carriage 16 which is mounted for sliding movement along the length of the frame mounting plate 10.

The end of the arm 12 opposite to that coupled to the sash mounting plate 11 is. pivotally coupled to a mounting or clip 4 17 via a pivot 18. As will hereinafter be described clip 17 is adapted for snap-lock fitting to one end of the frame mounting plate 10.

The frame mounting plate 10 is provided with a plurality of countersunk openings 19 whereby the frame mounting plate can be attached to the window frame. An opening 20 can be formed in clip 17 (as shown) to allow access to the opening 19 which would otherwise be covered by clip 17.

The frame mounting plate 10 is, in the preferred form, of extruded aluminium and in cross section can be described as being of substantially "G" shape. There is thus formed a longitudinally extending channel 21 and a lateral flange 22, the latter providing a carriage bearing surface 23.

Flange 22 is undercut beneath the carriage bearing surface 23 and this enables the countersunk openings 19 to be formed directly into the frame plate 10 as can be more clearly seen 20 in Figure 7. Openings 19 are formed as a secondary operation after extrusion of plate 10. The countersunk nature of openings 19 enables the heads of the fixing fasteners (eg screws) to be situated below the bearing surface 23. Consequently this carriage bearing surface 23 does not itself 25 need to be undercut. As a result bearing surface 23 provides a large contact area with the sliding surface of the flange 24 of sliding carriage 16, Consequently load is evenly distributed over this larger area resulting in a significant reduction in wear and/or the ability to carry a heavier load.

A longitudinal rib 25 extends along one side of the carriage 5 16 and this is profiled to slidingly fit within the longitudinal channel 21.

Channel 21 is in part defined by two curved surfaces 26. The presence of these curved surfaces 26 enable the rib 25 of the 10 carriage 16 to engage with maximum surface area within the channel 21. Also the tolerance fit of the rib 25 in the channel 21 with its curved surfaces 26 enables the carriage to freely pivot and accommodate any cavity variations.

In the preferred form of the invention the carriage 16 is formed from a plastics material and the interaction of the rib portion 25 in the channel 21 with its curved surfaces 26 results, in the preferred form of the invention, in the carriage not requiring a metal insert for strengthening 20 purposes.

The stay is primarily intended for use in a casement window. Thus with the stay which is situated at the top end of the window the carriage can, according to the construction 25 described above, slide more easily with reduced wear as the carriage rides on a curved surface rather than a point 3°°04o contact as is often the case with existing stays of this type.

As can be seen in the drawings the end of the arm 12 which is 5 coupled to the end clip 17 is stepped downwardly. The carriage 16 includes a land 27 which when the stay moves toward and is in the fully closed position engages with the underside of the arm 12 adjacent the stepped portion. This provides a support for the sash when in the closed position 10 to thereby prevent sag of the sash in the frame.

The end clip 17 is formed by a plate 28 with a longitudinally extending finger 29 at one end thereof. The other end of plate 28 is provided with an end block 30. Extending from 15 block 30 along one side of plate 28 is a chamfered spine 31 which engages into the frame plate channel 21. The finger 29 has a pair of teeth 32, these teeth being engageable in a pair of correspondingly positioned slots or notches 33 in the frame plate 10 when the clip 17 is located in position as 20 hereinafter described.

In the preferred form spine 31 has a profiled lead in end 31a which terminates adjacent the innermost tooth 32.

On the building site a window installer who wishes to install the sash into an already installed frame will receive the P ~ r - . |ri* "" "" f f rs "" .

" . J3 1 i;-T51".! 7 window frame with the frame mounting plate 10 already fastened in position. The installer can thus install the frame into the building construction. Furthermore the installer will receive the window sash which will have attached thereto the sash mounting plate 11, this sash plate carrying arm 12 with the carriage 16 and the end clip 17 pivotally coupled to the sash mounting plate 11 and arm 12 respectively.

To install the window the installer will simply position the sash in a plane parallel to that in which it lies in an open position (which can be the fully open position as illustrated) relative to the frame. Consequently the sash mounting plate 11, arm 12, sliding carriage 16 and end clip 17 will be orientated relative to the frame mounting plate as shown in Figure 4. The installer can then simply move the window sash relative to the frame such that the sliding carriage comes into engagement with the frame mounting plate 10 so that the rib 25 engages in the sliding channel 21.

This will be followed by the end clip 17 slidingly engaging with the frame plate 10 from the same end as the sliding carriage so that the chamfered spine 31 engages into the channel 21.

The aforementioned movement is complete once the teeth 32 snap lock into the notches 33 in the frame plate 10. At such point the shoulder 34 of end block 30 comes into engagement 8 with or be immediately adjacent the end of the frame mounting plate 10. By the teeth 32 snapping into the notches 33 the stay is effectively assembled and held together. This enables the sash to be fitted to the frame without any 5 fitting tools. As can be more clearly seen in Figures 5 and 6 at least the distal tooth 32 is slightly hook shaped or undercut so that it engages back under the frame mounting plate. Thus, as the window is opened and carriage 16 slides toward clip mount 17 the hooked surface of tooth 32 is forced 10 into closer contact with the edge of the slot 33. This provides a further restriction to tooth 32 trying to ride up out of its engagement in slot 33.

The forces that the end clip 17 must withstand get larger as 15 the sash moves into the closed position. However, the security of the clip 17 is guaranteed as the arm 12 moves over the clip finger 29 as the sash approaches the closed position thereby preventing the clip from disengaging as the sash closes. It will be noted that arm 12 is stepped at 37 20 and this stepped portion coincides with the sloped/stepped part 38 of finger 29 as the stay moves to the fully closed position.

Preferably carriage 16 also includes a projecting engagement 25 portion 39 which, as seen in Figure 3, overlaps with the end of finger 29 of clip mount 17. This applies a downward pressure on finger 29 so as to force projections 32 into 9 slots 33 in the event the projections 32 have tended to ride up out of the slots 33. This interengagement of the carriage 16 and clip 17 also provides an end stop for the stay in its fully opened position.

For further security, however, an opening 35 is provided in end block 30 whereby the installer can, if so choosing to do so, insert a mechanical fastener through opening 35 and into the window frame to thereby further secure the clip 17 in 10 position.

End block 30 has the dual function of a sash riser block. It t therefore has a chamfered face 36 which can engage with the sash as the window approaches the closed position to thereby 15 lift the sash into its correct orientation in the frame and support the sash against sagging in the frame.

To facilitate "squaring" of the sash in the frame in a simple yet effective manner the openings 19 in frame mounting plate 20 10 can be elongate with their major axis extending longitudinally of the frame plate 10. The installer can thus readily adjust the position of the frame plate by simply loosening off the fixing screws, moving the frame plate longitudinally to the desired position and then retightening 25 the screws.

Claims (4)

WHAT WE CLAIM IS:

1. A window stay comprising a frame mounting plate, a sash mounting plate, an arm pivotally coupled to the sash 5 mounting plate, a carriage guide extending longitudinally of the frame mounting plate, a carriage slidingly mounted with the carriage guide to be movable along the frame mounting plate, said sash mounting plate being pivotally coupled to the carriage, and said arm 10 being pivotally coupled to a mounting means which is clip mountable to the frame mounting plate.

2. A window stay as claimed in claim 1 including retaining means for retaining the mounting means when mounted on 15 the frame mounting plate against transverse movement on the frame mounting plate and clip location means for preventing longitudinal movement of the mounting means on the frame mounting plate. 20

3. A window stay as claimed in claim 2 wherein the retaining means is formed by an engagement element of the mounting means which engages in the carriage guide. 25

4. A window stay as claimed in claim 2 or 3 wherein the clip location means is formed by at least one releasable inter-engaging projection and recess, slot or the like 11 300040 provided with the frame mounting plate and mounting means. A window stay as claimed in any one of the preceding claims wherein the mounting means includes locating means for further locating the mounting means in longitudinal position on the frame mounting plate. A window stay as claimed in claim 5 wherein the locating means also forms a riser block for engagement with a window sash carried by the sash mounting plate. A window stay as claimed in claim 5 or 6 wherein the locating means includes an aperture for a mechanical fastening to be engageable therein and be fastened to a window frame with which the frame mounting plate is mounted. A window stay as claimed in any one of claims 1 to 7 wherein the mounting means is formed by a plate having a longitudinally extending finger, said plate having a spine engageable with a fixture of the frame mounting plate, the distal end of the finger having at least one projection engageable in an opening or recess in the frame mounting plate, there being a block which engages with the end of the frame mounting plate when the mounting means is mounted to the frame mounting plate. 300040 A window stay as claimed in claim 8 wherein the finger includes an inclined engagement surface which is engageable with a stepped part of the arm when the stay approaches or is in the closed position. A window stay as claimed in claim 8 or 9 wherein the carriage guide means is channel shaped. A window stay as claimed in claim 3 wherein the carriage guide means extends along substantially the whole length of the frame mounting plate, the carriage including a rib which is slidingly engaged in the guide means. A window stay as claimed in claim 11 wherein the carriage guide means is channel shaped, the distal ends of the sides of the channel shape being inwardly curved toward each other to form curved bearing surfaces for sliding engagement with similarly configured sliding surfaces of the carriage, the carriage including a portion which extends through a gap between said curved surfaces of the carriage guide means. A window stay as claimed in claim 12 wherein substantially all of the exposed surface of the frame mounting plate between the carriage guide means and the opposite longitudinal edge of the plate forms a sliding 300040 surface in contact with a substantially flat sliding surface of the flange of the carriage.

14. A window stay as claimed in claim 11 or 12 wherein the 5 carriage includes a land engageable with the sash mounting plate when the window stay is in a substantially closed position.

15. A window stay as claimed in any one of the preceding 10 claims wherein the carriage and/or mounting means are formed from a plastics material.

16. A window stay as claimed in any one of the preceding claims wherein one or more of the pivot joints between 15 the arm, frame mounting plate and sash mounting plate is/are friction joints.

17. A window stay as claimed in any one of the preceding claims wherein the frame mounting plate includes a 20 plurality of openings through which mechanical fastenings can pass to mount the mounting plate to a window frame, each opening being elongated with the major access thereof being located longitudinally of the frame mounting plate. 25 18 A window stay as claimed in any one of claims 1 to 17 wherein the carriage includes an engagement portion 14 30 0040 which engages with the mounting means when the stay is in the fully opened position. A window stay as claimed in claim 8 wherein at least one of the projections is hook shaped or undercut to engage about an edge of a slotted opening in the frame mounting plate. A window stay substantially as herein described with reference to the accompanying drawings. INTERLOCK INDUSTRIES LIMITED By its Attorney DON HOPKINS & ASSOCIATES Per END OF CLAIMS