GB2156900A

GB2156900A - Pivot system for pivoting sash

Info

Publication number: GB2156900A
Application number: GB08409049A
Authority: GB
Inventors: Robert Mansell
Original assignee: K G SMOKE DISPERSAL Ltd
Current assignee: K G SMOKE DISPERSAL Ltd
Priority date: 1984-04-07
Filing date: 1984-04-07
Publication date: 1985-10-16
Also published as: GB2156900B; GB8409049D0

Abstract

A pivot system for a pivoted sash comprises a first bearing member (1, 41) secured to a frame and a second bearing member (3,61) secured to the sash. The first bearing member includes a split ring (5,42) and the second bearing member includes a ring (20,66). In one embodiment, illustrated in Figures 1 to 3, the first bearing member also includes a slide (15) carrying a block (16). The second bearing member includes a segment (26) formed with a gap (28) between the ends thereof. The block (16) is movable from a position in which it is located in the gap (28) to a position in which it is clear of the segment (26). In a second embodiment, illustrated in Figures 4 to 6, (not shown) the first bearing member includes a slide (52) formed with two blocks (54 and 55) having a gap (56) between them. The second bearing member includes a plate (68) having two upstanding portions (69 and 70). The slide (52) can be moved between a first position, in which it limits rotation of the sash to about 60 degrees, to a second position in which it limits rotation of the sash to about 240 degrees. <IMAGE>

Description

SPECIFICATION Improvements in or relating to pivot systems for pivoting sashes This invention relates to pivoting sashes of the kind in which a pivot system is provided to enablethe sash to pivot about a horizontal axis with respect to a frame.

In one form of pivoting sash, a hinge connection is provided betweenthetop memberoftheframeand the top ofthe sash. In anotherform, a hinge connection is provided between the bottom member oftheframeandthebottomofthesash. Howeverthe present invention is concerned with the type of pivoting sash nwhichthe pivot axis is located between thetopand bottom ofthe sash. It may, for example, be located in the middle ofthe sash, or it may be located between the middle andthetop, or between the middle and the bottom ofthe sash. Thus, in this type of pivoting sash, a rotary connection is provided between each side member ofthe frame and the corresponding side member ofthe sash.

Normally it is desirableto providesome means for limiting the anglethrough which the sash can pivot with respect to the frame. In the past such limiting means have normally been in the form of a strutwhich is pivotally connected to the frame and slideably connected to the sash. Alternatively the strut may be pivotally connected to the sash and slideably connected to the frame. In the case of relatively heavy sashes, of course, one strut will be provided at each side ofthe sash. It is normally desirable to be able to rotate the sash through an angle greater than that to which it is limited by the limiting means when it is desired to clean the sash. Forthis purpose, normally eitherthe pivoting connection orthesliding connection is arranged to be disconnectable.

It has been found that such limiting means suffer for a number of disadvantages. In particular, the sash may be closed afterthe strut has been disconnected for cleaning purposes withoutthe strut being reconnected. In this case the strut may be damaged.

In a alternative type of limiting means the strut is pivotally connected onlyto the sash and a single removable connection is provided to the frame.

Alternatively, of course, the permanent pivoting connection may beta the frame and the removable connection may betothe sash. In either casethe strut is liable to be damaged, particularly ifthe sash is closed while the strut is disconnected.

It is an object ofthe present invention to provide limiting means which do not involve the use of a strut.

From onaaspectthe invention consists in a pivot system for a pivoting sash, comprising a first bearing memberfitted to a frame and a second bearing member fitted to the sash, where one of said bearing members includes a housing having an internal circularbearing surface, while the other bearing member has an external circular bearing surface contained in said housing and cooperating with said internal surface, wherein first stop means on one of said bearing members is slidable, from a first position .in which it cooperates with second stop means on the other bearing member to I imit angula r motion of said sash relative to said frame to a predetermined angle to a second position in which it allows said angular motion to exceed said predetermined angle.

Preferably the first stop means is provided on the first bearing member. In particular, when the frame consists of channel section or angle section material, the first bearing member is located within the channel or in the angle in such a way that, when the sash is closed, the stop means is concealed.

Preferably, also,the internal circular bearing surface is provided onthefirst bearing member, while the external bearing surface is provided on the second bearing member.

In one embodiment of the invention, which incorpo rates the above two preferred features, the first stop means comprises a longitudinally extending block fixedly mounted on a slide, which is itself mounted for vertical sliding motion in the frame. In this case the external bearing surface may be in the form of a cylindrical wall and the second stop means may comprise a cylindrical segment secured to the inside of said wall to increase the thickness thereof over a portion of its circumference. In this case the block is movable from afirst position in which a portion thereof is located in the gap between the ends of said cylindrical segment, and a second position in which it is moved radially inwardly with respect to said cylindrical segment.Thus, in the first position, the block limits motion ofthe sash with respect to the frame to the angular extent ofthe gap between the ends of the cylindrical segment less the width of the block. In the second position, on the other hand, the block is moved out ofthe path of the cylindrical segment so that it does not constitute any limitation on the relative rotation between the two bearing members. Usually, of course, a limit will be provided on the relative rotation between the sash and the frame bythe weathering provided on the sash and the frame.

In another embodiment of the invention, the first stop means comprises two blocks mounted on a slide with a gap therebetween. In this case the second bearing member includes a circular plate secured within the cylindrical bearing surface. This plate incorporates two segments, upstanding from the surface thereof, facing the first bearing member. One of these segments is located with its outer surface substantially adjacentto the inner surface ofthe cylindrical member, while the other segment is located with its outer surface spaced from the inner surface ofthe cylindrical member.Thus the arrange ment is such that in the first position ofthe stop means, relative rotation of the two bearing members in one direction is limited by abutment of one end of said one segment with one of said blocks, while relative rotation in the other direction is limited by abutment of one end of said other segment with the other of said blocks. With the stop means in this first position the predetermined angle is relatively small, for example 60 degrees. In the second position ofthe stop means, said one segment is allowed to pass through the gap between said one block and the internal cylindrical surface ofthe second bearing member until it butts up againstthe other block which, in this position ofthefirststop means, isadjacentto the inner cylindrical surface ofthe second bearing member.Similarlythe other segment is allowed to pass through the gap between said two blocks until it comes into contact with said one block. In this position ofthe first stop means, relative rotation between the sash and the frame is not limited to said predetermined angle but is limited to a considerably larger angle, which in most practical cases will in fact exceed the angle to which this relative motion is limited by the weathering on the sash andtheframe.

From another aspectthe invention consists of any featuresofnovelty,taken singly or in combination, of the embodiments ofthe invention illustrated in the accompanying diagrammatic drawings, in which: Figure 1 i3 an exploded perspective view of the two bearing members of a first embodiment of the invention; Figure 2 is an elevation, partly in sec ron, ofthe embodiment of Figure 1,withthefirststop means in thefirst position; Figure 3 is an elevation, partly in section, ofthe embodiment of Figure 1, with thefirststop means in the second position; Figure 4 is an exploded perspective view ofthe two bearing members of a second embodimentofthe invention;; Figure 5 is an elevation, partly in section, ofthe embodiment of Figure 4,with the first stop means in thefirst position; Figure 6 is an elevation, partly in section, ofthe embodiment of Figure 4,with the first stop means in the second position.

Referring to Figures 1-3 ofthe Drawings, it will be seen thatthe embodiment illustrated includes a first bearing member 1 located in an angle section member 2 of a frame and a second bearing member3 secured to a side member 4 of the sash.

The first bearing member includes a split ring 5 having an internal bearing surface 6. An extension 7 is provided on one end of the split ring and an extension 8 is provided on the other end. A bolt9 passes through a clearance hole in the extension 7 and engages in a tapped hole in the extension 8. Thus the bolt 9 can be used to adjust a gap 10 between the two ends of the split ring,thus adjusting the diameter of the bearing surface 6.

The extension 7 is also provided with a further hole, enabling the bearing memberto be secured to the channel 2 by means of a screw 11. Aflange 12 is also formed on the ring 5to enablethe bearing memberto besecuredtothe channel section 2 by means of a further screw 13.

The screw 13 passes through a slot 14 in a slide 15, which is located between the ring 5 and the channel section 2. Fitted to the slide is a block 16 constituting the first stop means. The slide 15 can be moved vertically as indicated by the arrows 17 by means of an operating pin 18. Thus the block 16 is movable within the ring 5.

The second bearing means 3 include a ring 20 having an external bearing surface 21 .The ring 20 is secured to the frame 4 by means of screws 22 and 23 passing through holes in fFanges 24 and 25. The ring 20 is also provided with a cylindrical segment 26 secured to the innerwafl of the ring, for example by means of rivets27.Thecylindrical segment26 is formed with a gap 28 between the ends thereof.

When the sash is fitted inthe frame, the bearing surface 21 ofthe second bearing member cooperates with the bearing surface 6 ofthe first bearing member to enable the sash to pivot about the axis ofthe ring 20.

When the block 16 is in'the position shown in Figures 1 and 2, angular rotation ofthesash-abouttheaxis ofthe ring 20 is limited to the arc.indicatedbythe arrows 29 (Figure 2) by abutment of the ends ofthe gap 28 againstthe block 16. On the other hand, when the block 16 is moved into the position illustrated in Figure 3, this limitation on the rotation ofthe sash is removed so that the sash can revolve as indicated bythe arrows 30 (Figure 3) in the absence of any other limitation.

Referring to the embodiment illustrated in Figures 4-6, it will be seen thatthe first bearing member 41 includes a split ring 42 formed integrally with two mounting flanges 43 and 44 and two extensions 45 and 46.The width of a gap 47 between the two extensions 45 and 46 can be adjusted by means of a screw 48. The ring 42 is also formed with two plate portions 49 and 50 which, between them, define a channel 51 which forms a guide for a slide 52. In addition, the plate portion 50 is formed with a gap 53 which constitutes an extension of the gap 47 so that the screw 48 can be used for adjusting the internal dimensions ofthe ring 42. The slide 52 is formed with two blocks 54 and 55 having a gap 56 between them.

The embodiment illustrated in Figure 4-6 also includes a second bearing member 61 secured to the sash 62 by means of screws 63 passing through integrallyformed flanges 64 and 65. The bearing member 61 also includes a ring 66 constituting an external bearing surface 67. Fitted inside the ring 66 is a plate 68 having two upstanding portions 69 and 70.

When the two bearing members arefitted together, a split nylon ring 57 is inserted within the ring 42to provide a smooth internal bearing surface to cooper ate with the bearing surface 67.

It will be seen that, when the slide 52 is inthe position illustrated in Figures 4 and 5, anticlockwise rotation (as seen in Figure 5} ofthe bearing member 61, relative to the bearing member 41, is limited by engagement of the end 71 ofthe upstanding portion 70 with the block 54, and by engagement ofthe end 72 ofthe upstanding portion 69 with the block 55.

Similarly, clockwise rotation ofthe bearing member 61 will be limited by engagement of the end 73 of the upstanding portion 70 with the stop member 55 and by engagement ofthe end 74 of the upstanding portion 69 with the block54. Thus rotation ofthe bearing member 61 is limited to the arc indicated by the arrow 75 in Figure 5.

When the slide 52 is moved vertically into the position illustrated in Figure 6, a larger angular rotation is permitted as indicated by the arrow 76. It will be seen that, with the slide in this position, the upstanding portion 69 can pass through the gap 56 between the blocks 54 and 55, while the upstanding portion 70 can pass through a gap 77 which is now formed between the lower end ofthe block 54 and the nylon insert 57. However, clockwise rotation ofthe bearing member 61 is still limited by engagement of the end 73 of the upstanding portion 70 with the block 55 and by engagement ofthe end 74 ofthe upstanding portion 69 with the block 54. Similarly, anticlockwise rotation ofthe bearing member 61 will be limited by engagement between the end 72 of the upstanding portion 69withtheblockS4andengagementofthe end 71 of the upstanding portion 70 with the block 55.

Claims

1. A pivot system for a pivoting sash, comprising a frstbearing memberfittedto aframeand a second bearing memberfitted to the sash, where one of said bearing members includes a housing having an internal circular bearing surface, whilethe other bearing member has an external circular bearing surface contained in said housing and cooperating with said internal surface, wherein first stop means on one of said bearing members is slideable, from a first position which it cooperates with second stop means on the other bearing memberto limit angular motion of said sash relative to said frame to a predetermined angle to a second position in which it allows said angular motion to exceed said predetermined angle

2.A pivot system as claimed in Claim 1, wherein the first stop means is provided on the first bearing member.

3. A pivot system as claimed in Claim 2, wherein the frame consists of channel section or angle section material andwhereinthe first bearing member is located within the channel or inthe angle in such a way that, when the sash is closed, the stop means is concealed.

4. A pivot system as claimed in Claim 2 or Claim 3, wherein the internal circular bearing surface is provided on thefirst bearing member, while the external bearing surface is provided on the second bearing member.

5. A pivot system as claimed in Claim 4, wherein thefirststop means comprises a longitudinally extending block fixedly mounted on a slide, which is itself mounted for vertical sliding motion in the frame.

6. A pivot system as claimed in Claim 5, wherein the external bearing surface is in the form of a cylindrical wall and the second stop means comprises a cylindrical segment secured to the inside ofthe said wall to increase the thickness thereof over a portion of its circumference.

7. A pivot system as claimed in Claim 6, wherein the slide is movable from a first position, in which a portion ofthe block is located in the gap between the ends of the cylindrical segment, and a second position in which the block is located radially inwardlywith respect to said cylindrical segment, so that in thefirst position the block limits motion ofthe sash with respectto the frame to the angular extent ofthe gap between the ends of the cylindrical segment, less the width ofthe block, whereas in the second position the block does not constitute any limitation on the relative rotation between the two bearing members.

8. A pivot system as claimed in Claim 4, wherein thefirststop means comprises two blocks mounted on a slide with a gap therebetween, said slide being itself mounted for vertical sliding motion in the frame.

9. A pivot system as claimed in Claim 8, wherein the second bearing member includes a circular plate secured within the cylindrical bearing surface, which plate incorporates two segments upstanding from the surfacethereoffacingthefirstbearing member.

10. A pivot system as claimed in Claim 9, wherein one of said segments is located with its outersurface substantially adjacent to the inner surface of the cylindrical member, while the other segment is located with its outer surface spaced from the inner surface of the cylindrical member.

11. A pivot system as claimed in Claim 10, wherein the slide is movable from a first position, in which relative rotation ofthetwo bearing members in one direction is limited by abutment of one end of said one segment with one of said blocks, while relative rotation in the other direction is limited by abutment of one end of said other segment with the other of said blocks, to a second position in which said one segment is allowed to pass through the gap between said one block and the internal cylindrical surface of the second bearing member until it abuts up against said other block, while said other segment is allowed to pass through the gap between said two blocks until it comes into contact with said one block.

12. A pivot system as claimed in Claim 11, wherein, when the slide is in said first position, the predetermined angle is less than 90 degrees.

13. A pivot system as claimed in Claim 12, wherein, when the slide is in said first position,the predetermined angle is 60 degrees.

14. A pivot system for a pivotsash substantially as hereinbefore described with reference to, and as illustrated in, Figures 1 to 3 ofthe accompanying diagrammatic drawings.

15. A pivot system for a pivot sash substantially as hereinbefore described with reference to, and as illustrated in, Figures 4to 6 ofthe accompanying diagrammatic drawings.

16. Anyfeatures of novelty, taken singly or in combination, of the pivot systems illustrated in the accompanying diagrammatic drawings.