GB2184778A

GB2184778A - Friction stay

Info

Publication number: GB2184778A
Application number: GB08630173A
Authority: GB
Inventors: Jack Ernest Douglas
Original assignee: HASP INT Ltd
Current assignee: HASP INT Ltd
Priority date: 1985-12-18
Filing date: 1986-12-17
Publication date: 1987-07-01
Also published as: GB8531155D0; CN86102493A; GB8630173D0

Abstract

A friction stay 21 has mounting plates 22 and 23 for attachment to a fixed frame and a sash frame respectively and connected by arms 24, 25 through friction pivot joints 37, 38, 39, 40 at the opposed ends of the arms so that the sash frame is supported for frictionally restrained movement on and relative to the frame, and a stop to limit opening movement. The stop is provided adjacent to the friction pivot joint 37 and comprises an arcuate recess 54 in the frame mounting plate 22 and an abutment such as a steel roll pin 57 mounted on the arm 24 and received in the recess 54. The pin 57 is engageable with the opposed ends of the recess 54 in the closed and open positions of the stay 21. In other embodiments the arm 24 is straight and it may be pivoted to a shoe slidable along the plate 22, the shoe being formed with an arcuate recess. <IMAGE>

Description

SPECIFICATION Fnetion Stay This invention relates to friction stays and in particular, though not exclusively, to friction window stays for mounting a sash frame on a fixed frame for frictionally restained pivotal movement about a horizontal or a vertical axis.

Normally, two stays are provided at opposite sides of the window and control opening/closing movement of the sash frame and frictionally retain the sash frame in any adjusted position.

It is known to provide one or both stays with a stop to limit opening movement of the stay and hence the sash frame to prevent damage to the stay parts and/orthe sash frame.

A disadvantage of many of the known stops, however, is that they are of complex construction and restricted in use to a particular construction of stay.

It is an object of the present invention to provide a friction stay incorporating a stop which is simple construction that can be used in different constructions of stay.

According to the present invention we provide a friction stay adapted and arranged for mounting c.l a closure member and securing to an associated frame so that the closure member is supported for frictionally restrained movement on and relative to the frame, the stay comprising a plurality of stay parts connected together by one or more pivot joints which permit pivotal movement of the stay parts, and a stop to limit opening movement of the stay, the stop comprising a recess in one of two relatively movable stay part and an abutment on the other stay part which is received in the recess and is engageable with one end of the recess in the open position of the stay.

By the present invention any desired opening movement can be obtained by appropriate selection of the length of the recess and the position of the abutment.

Furthermore the stop construction of a recess and an abutment can be applied to all types and constructions of friction stay.

Conveniently the abutment is engageable with the other end of the recess in the closed position of the stay.

Advantageously the recess is shaped to cooperate with the abutment to generate a force which assists movement of the stay to the closed position.

Preferably the stop is provided adjacent to a pivot joint between said two stay parts and the recess is of arcuate shape.

The stay preferably comprises respective mounting plates for mounting on the closure member and securing to the associated frame and an arm connected by respective pivot joints at one end to the frame mounting plate and/or a member associated therewith and at the other end to the sash mounting plate.

Preferably the stop is provided adjacent to the pivot joint between the arm and the frame mounting plate and/or associated member.

Advantageously the recess is formed in the frame mounting plate and/or associated member and the abutment is mounted on the arm.

Where the arm is connected to the frame mounting plate, a support pad may be interposed between the frame mounting plate and the arm to support the arm during pivotal movement between the open and closed positions.

Where the arm is connected to the associated member, the latter may comprise a shoe mounted on the frame mounting plate for sliding movement longitudinally thereof.

The frictional restraint to movement of the closure member may be provided by internal friction in one or more of the pivot joints or by frictional engagement between the shoe and the frame mounting plate or a combination of both.

The invention will now be described in more detail by way of example only with reference to the accompanying drawings, wherein:- Figure 1 is a plan view, partly in section, of one side of a window incorporating a first embodiment of a stay according to the present invention, the window being shown closed; Figure 2 is a side view of part of the window shown in Figure 1, the window being shown fully open; Figure 3 is a side view of the stay shown in Figures 1 and 2 illustrating both the closed (broken lines) and open (full lines) positions of the stay; Figure 4 is a section on the line 1- 4 of Figure 3; Figure 5 is an exploded isometricview of part of the stay shown in Figures 3 and 4;; Figure 6 is a perspective view of a second embodiment of a stay according to the present invention illustrating the open position of the stay; Figure 7 is a perspective view, similar to Figure 6, showing a modification of the second embodiment; Figure 8 is a perspective view of a third embodiment of a stay according to the present invention illustrating the open position of the stay; and Figure 9 is a perspective view, similar to Figure 8, showing a modification of the third embodiment.

Referring first to Figures 1 to 5 of the accompanying drawings, there is shown in Figure 1 one side of a window 1 comprising a rectangular fixed frame 2 and a rectangular sash frame 3, each constructed from respective frame elements 4 and 5 cut to length from extrusions of aluminium alloy having the sections shown and joined at the corners by any appropriate means.

The fixed frame elements 4 each comprise a channel-section body 6 having a longitudinal flange 7 contiguous with one side and formed with a longitudinal groove 8 in which is mounted a weatherstrip 9.

The sash frame elements 5 each comprise a hollow rectangular section body 10 having a longitudinal flange 11 contiguous with one side and formed with a longitudinal groove 12 in which is received a weatherstrip 13. The body 10 further has a longitudinal flange 14 contiguous with the other side and extending in the opposite direction to the flange 11. The flange 14 provides an abutment for the marginal edge of glazing 15 which is secured in weatertight manner by a clip-in bead 16 and sealing strips 17, 17'.

In the closed position of the window 1 shown in Figure 1, each flange 7 of the fixed frame 2 overlaps the adjacent sash frame element 5 on the inside of the window 1 and is sealed thereto by the weatherstrip 9 while each flange 11 of the sash frame 3 overlaps the adjacent fixed frame element 4 on the outside of the window 1 and is sealed thereto by the weatherstrip 13. The flanges 7 and 11 on each side of the window 1 also define with respective opposed webs 18 and 19 of the fixed frame elements 4 and sash frame elements 5 a peripheral recess 20 of rectangular section extending completely around the sash frame 3.

Mounted in the peripheral recess 20 on opposed sides of the sash frame 3 are a pair of friction stays 21 (one only shown) according to the present invention for controlling movement of the sash frame 3 relative to the fixed frame 2 between the closed position shown in Figure 1 and the fully open position shown in Figure 2 and for frictionally retaining the sash frame 3 in any adjusted position.

As best shown in Figures 3 to 5, each friction stay 21 comprises a frame mounting plate 22 and a sash mounting plate 23 connected together by first and second arms 24 and 25 respectively.

The frame plate 22 is both longer and wider than the sash plate 23 and is formed with longitudinal lips 26,27 on the opposed sides and a plurality of longitudinally spaced apart countersunk holes 28 by means of which it is secured in spaced relationship to the web 18 of the fixed frame element 4 adjacent to the flange 7 by countersunk pop (R.T.M.) rivets 29.

The sash plate 23 is also formed with longitudinal lips 30,31 on the opposed sides and a plurality of longitudinally spaced apart countersunk holes 32 by means of which it is secured in spaced relationship to the the 19 of the sash frame element 5 adjacent to the flange 11 by countersunk pop rivets 33.

The first stay arm 24 is of cranked construction having offset, substantially parallel end portions 34 and 35 respectively joined by a centre portion 36 inclined relative thereto. The second stay arm 25 is straight and of longer length than the first stay arm 24.

Both stay arms 24,25 are pivotally connected at corresponding one ends to the frame plate 22 by respective longitudinally spaced apart friction pivot joints 37,38 and at the corresponding other ends to the sash plate 23 by respective longitudinally spaced apart friction pivot joints 39,40.

The spacing between the friction pivot joints 37, 38 on the frame plate 22 is greater than that between the friction pivot joints 39,40 on the sash plate 23 and the relative spacings are so chosen together with the lengths of the stay arms 24, 25 that, in the closed position of the stay, the sash plate 23 extends substantially parallel to and substantially overlies the frame plate 22 on one side as shown in broken lines in Figure 3 and, in the open position of the stay, the sash plate 23 extends substantially transversely with respect to the frame plate 22 and is spaced from said one side as shown in full lines in Figure 3.

The friction pivot joint 37 between the end portion 34 of the cranked stay arm 24 and the frame plate 22 includes a plastics coated tubular metal rivet 41 having a frusto-conical head 42 and a cylindrical shank 43.

The rivet head 42 is received in a countersunk recess 44 in the stay arm 24 and the shank 43 extends through respective aligned circular holes 45,46 and 47 in the stay arm 24, frame plate 22 and a plastics support pad 48 disposed between the stay arm 24 and the frame plate 22.

The support pad 48 provides a spacerta separate the stay arm 24 and frame plate 22 to prevent metalto-metal contact on relative movement therebetween and supports the end portion 34 of the cranked arm 24 for all pivotal movement between the closed and open positions.

The support pad 48 is located on the frame plate 22 by means of a longitudinal lip 49 engaging the longitudinal lip 26 of the frame plate 22 and by a pair of cylindrical lugs 50 received in complementary holes 51 in the frame plate 22.

The tail 52 of the rivet 41 is clinched to the undersde of the frame plate 22 and engages a lock washer 53 disposed on the shank 43 between the tail 52 and the frame plate 22 to locate the rivet tail 52 and fix the rivet 41 relative to the frame plate 22 whilst permitting rotation of the stay arm 24 relative to the frame plate 22 on opening and closing the stay 21.

The other three friction pivot joints 38,39,40 are of similar construction to the friction pivot joint 37 above-described except that the support pad 48 is replaced by an annular plastics coated metal washer (not shown).

In known manner the clinching force is controlled to generate the same residual friction within each joint 37,38,39,40 to ensure smooth operation of the stay.

The stay 21 further includes a stop adjacent to the pivot joint 37 to limit movement of the sash plate 23 relative to the frame plate 22 both on opening and on closing the stay 21.

The stop comprises an arcuate recess 54 formed by a slot 55 in the frame plate 22 aligned with a slot 56 in the support pad 48 and a steel roll pin 57 secured in a bore 58 in the end portion 34 of the cranked stay arm 24.

The pin 57 is received in the recess 54 and, as best shown in Figure 3, engages the opposed ends of the recess 54 in the closed position (broken lines) and the open position (full lines) respectively of the stay 21.

In the open position, the upper surface 23a of the sash plate 23 is spaced above the upper surface 35a of the end portion 35 of the cranked stay arm 24 connected thereto. Consequently, in the fully open position of the sash frame 3 shown in Figure 2, the upper surface 35a of the end portion 35 is prevented from contacting and damaging the inwardly directed flange 11 1 or 11 ofthesashframe3and/orthe weatherstrip 13 carried thereby.

Referring now to Figure 6, there is shown a second embodiment of a friction window stay 59 according to the present invention suitable for mounting a sash frame (not shown) on a fixed frame (not shown) in similar manner to the first embodiment above-described.

The stay 59 comprises a frame mounting plate 60 and a sash mounting plate 61 connected by a pair of straight arms 62, 63 of which the arm 62 is of shorter length than the arm 63.

The frame and sash mounting plates 60 and 61 respectively are each of L-shape in transverse crosssection and are each provided with a plurality of longitudinally spaced apart holes 64 and 65 respectively by means of which they are secured to the fixed frame and sash frame by fastening means (not shown) such as screws or rivets.

Both arms 62,63 are pivotally connected at corresponding one ends to the frame mounting plate 60 by respective longitudinally spaced apart friction pivot joints 66,67 and at the corresponding other ends to the sash mounting plate 61 by respective longitudinally spaced apart friction pivot joints 68,69.

The friction pivot joints 66,67,68,69 are each of similar construction to the friction pivot joint 37 above-described except that the support pad 48 is replaced by an annular plastics coated metal washer (not shown).

The spacing between the pivot joints 66,67,68,69 is chosen together with the length of the arms 62,63 that in the closed position (not shown) of the stay the sash mounting plate 61 extends substantially parallel to and substantially overlies the frame mounting plate 60 and, in the open position, extends at an acute angle thereto as shown.

The stay further includes a stop adjacent to the pivot joint 66 to limit opening and closing movement of the stay.

The stop comprises an arcuate recess 70 in the frame mounting plate 60 and a roll pin 71 mounted on the arm 62.

The pin 71 is received in the recess 70 and engages one end of the recess 70 in the open position of the stay 59 as shown and the other end of the recess 70 in the closed position of the stay (not shown).

Referring now to Figure 7 there is shown a modification of the second embodiment abovedescribed in which the stop recess 70 is provided in the arm 62 and the roll pin 71 is mounted on the frame mounting plate 60. In other respects the construction and operation of this stay is similar to that of the second embodiment and like reference numerals are used to indicate corresponding parts.

Referring now to Figure 8 there is shown a third embodiment of a friction window stay 72 according to the present invention suitable for mounting a sash frame (not shown) on a fixed frame (not shown) in similar manner to the first embodiment above-described.

The stay 72 comprises a frame mounting plate 73 and a sash mounting plate 74 connected by a pair of straight arms 75,76 of which the arm 75 is of shorter length than the arm 76.

The mounting plates 73,74 are each formed with a plurality of holes 77,78 respectively by means of which they are secured to the fixed frame and sash frame respectively by fastening means (not shown) such as screws or rivets.

The frame mounting plate 73 is of channel-section with inwardly turned lips 79 defining a track 80 in which a brass or plastics shoe 81 is located and retained for sliding movement longitudinally of the track 80.

The arm 75 is pivotally connected at one end to the sash mounting plate 74 by a pivot joint 82 and at the other end to the shoe 81 by a pivot joint 83. The arm 76 is pivotally connected at one end to the sash mounting plate by a pivot joint 84 spaced longitudinally from the pivot joint 82 and at the other end to the frame mounting plate by a pivot joint 85 longitudinally spaced from the shoe 81.

In addition the stay includes a brace 86 pivotally connected at one end to the shoe 81 by a pivot joint 87 and at the other end to the arm 76 by a pivot joint 88 intermediate the ends of the arm 76.

The shoe 81 is slidable lengthwise of the track 80 on opening/closing the stay and the length of the arms and the position of the pivot joints is so chosen that in the closed position of the stay (not shown) the sash mounting plate extends substantially parallel to and substantially overlies the frame mounting plate and, in the open position extends at an acute angle thereto as shown.

In known manner the frictional restraint for retaining the sash frame in any adjusted position is provided by the frictional engagement between the shoe 81 and the track 80 and may be enhanced by the use of friction pivot joints for one or more of the pivotal connections.

A stop is provided adjacent to the pivot joint 83 for limiting opening and closing movement of the stay 72.

The stop comprises an arcuate recess 89 formed in the shoe 81 and a roll pin 90 mounted on the arm 75.

The pin 90 is reeived in the recesss 89 and engages one end of the recess in the open position of the stay 72 as shown in Figure 8 and the other end of the recess in the closed position of the stay (not shown).

Referring now to Figure 9, there is shown a modification of the third embodiment abovedescribed in which the frame mounting plate 73 is formed with an arcuate recess 91 and the roll pin 90 is received in both the shoe recess 89 and the recess 91. In other respects the construction and operaton of this stay is similar to that of the third embodiment and like reference numerals are used to indicate corresponding parts.

As will now be appreciated the present invention provides a stop suitable for use in a range of different constructions of friction stay in which opening movement of the stay is controlled by the length of the recess and the position of the pin. In this way any desired limitation on the opening movement can be obtained by appropriate selection of the recess length and pin position.

Furthermore, in each of the embodiments abovedescribed the recess is constructed to cooperate with the pin on closing the stay to generate a force which urges the stay to the closed position. In use, such force assists in overcoming any resistance to closing of the sash frame for example due to different types and thicknesses of weatherseal thereby ensuring that an effective weathertight seal is obtained.

It will be understood that the invention is not limited to the embodiments above-described, for example the position of the recess and pin forming the stop in the first and third embodiments may be reversed as described in connection with the second embodiment.

Any of the stays above-described may be provided with additional arms or braces interconnecting the stay parts for increased strength.

Where provided, friction pivot joints may be of any known construction as may the sliding shoe.

The mounting plates, arms and brace may be formed from aluminium or steel or any other suitable metal or alloy to which any surface finish may be applied as desired.

The mounting plates, arms and brace may be formed from extrusion of the appropriate section cut to length and provided with the necessary holes, slots etc. Alternatively, they may be formed by pressing, stamping, rolling, casting or any other suitable technique.

Although the stays have been described with reference to a window in which the sash frame and fixed frame are each constructed from extrusions of aluminium alloy, the stays have application to windows in which the sash frame and fixed frame are constructed from other metals, alloys or composites of metals, alloys and plastics having any desired cross-section. Alternatively the sash frame and fixed frame may be of timber or part timber construction.

The stays may be used in pairs to mount a sash frame for top, bottom or side opening as described.

Alternatively the stays may be used with another similar stay in which the stop is omitted.

Finally, although the stays have been described in a window for mounting a sash frame on a fixed frame, it will be understood that the stays may be used to mount other closure members, for example doors, on a fixed frame and, where conditions allow the stays may be used singly to mount a closure member on a fixed frame.

Claims

1. A friction stay adapted and arranged for mounting on a closure member and securing to an associated frame so that the closure member is supported for frictionally restrained movement on and relative to the frame, the stay comprising a plurality of stay parts connected together by one or more pivot joints which permit pivotal movement of the stay parts, and a stop to limit opening movement of the stay, the stop comprising a recess in one of two relatively movable stay parts and an abutment on the other stay part which is received in the recess and is engageable with one end of the recess in the open position of the stay.

2. A friction stay according to claim 1 wherein the abutment is engageable with the other end of the recess in the closed position of the stay.

3. A friction stay according to claim 1 or claim 2 wherein the recess is shaped to co-operate with the abutment to generate a force which assists movement of the stay to the closed position.

4. A friction stay according to any one of the preceding claims wherein the stop is provided adjacent to a pivot joint between said two stay parts and the recess is of arcuate shape.

5. A friction stay according to any one of the preceding claims wherein the stay comprises respective mounting plates for mounting on the closure member and securing to the associated frame and an arm connected by respective pivot joints at one end to the frame mounting plate or a member associated therewith and at the other end to the sash mounting plate.

6. A friction stay according to claim 5 wherein the stop is provided adjacent to the pivot joint between the arm and the frame mounting plate and/or associated member.

7. A friction stay according to claim 6 wherein the recess is formed in the frame mounting plate and/or associated member and the abutment is mounted on the arm.

8. A friction stay according to claim 6 or claim 7 wherein the arm is pivotally connected to the frame mounting plate.

9. A friction stay according to claim 8 wherein a support pad is interposed between the frame mounting plate and the arm to support the arm during pivotal movement between the open and closed positions.

10. A friction stay according to claim 9 wherein the support pad is formed with a slot aligned with the recess.

11. A friction stay according to any one of claims 5 to 10 wherein the arm is cranked.

12. A friction stay according to claim 11 having substantially 90 opening movement.

13. A friction stay according to any one of claims 5 to 10 wherein the arm is straight.

14. A friction stay according to any one of claims 5 to 13 including a second arm connected by respective pivot joints at one end to the frame mounting plate and at the other end to the closure mounting plate, the pivot joints of the second arm being longitudinally spaced from the pivot joints of the first arm.

15. Afriction stay according to claim 14 wherein the second arm is straight and of longer length than the first arm.

16. A friction stay according to claim 6 or claim 7 wherein the arm is pivotally connected to a shoe mounted on the frame mounting plate for sliding movement longitudinally thereof.

17. A friction stay according to claim 16 wherein the shoe frictionally engages the frame mounting plate.

18. A friction stay according to claim 15 or claim 16 wherein a second recess is formed in the frame mounting plate and the abutment is received in both recesses.

19. A friction stay according to any one of claims 16 to 18 wherein the arm is straight.

20. A friction stay according to any one of claims 16to 19 including a second arm connected by respective pivot joints at one end to the frame mounting plate and at the other end to the closure mounting plate, the pivot joints of the second arm being longitudinally spaced from the pivot joints of the first arm.

21. A friction stay according to claim 20 wherein -the second arm is straight and of longer length than the first arm.

22. A friction stay according to claim 22 including a brace connected by respective pivot joints at one end to the shoe and at other end to the second arm intermediate the ends of the second arm.

23. A friction stay according to any one of claims 5 to 22 wherein the mounting plates extend substantially parallel to and substantially overlie one another in the closed position and extend at an angle to one another in the open position.

24. A friction stay according to any one of the preceding claims wherein at-least one pivot joint is a friction pivot joint.

25. A friction stay substantially as hereinbefore described with reference to Figures 1 to 5 of the accompanying drawings.

26. A friction stay substantially as hereinbefore described with reference to Figure 6 of the accompanying drawings.

27. A friction stay substantially as hereinbefore described with reference to Figure 6 of the accompanying drawings as modified by Figure 7 of the accompanying drawings.

28. A friction stay substantially as hereinbefore described with reference to Figure 8 of the accompanying drawings.

29. A friction stay substantially as hereinbefore described with reference to Figure 8 of the accompanying drawings as modified by Figure 9 of the accompanying drawings.

30. A friction stay according to any one of the preceding claims in combination with a closure member and an associated frame.

31. The combination according to claim 30 wherein the closure member is a sash.

32. The combination according to claim 30 wherein the closure member is a door.