GB2294727A

GB2294727A - Link arm assembly for a turnable window

Info

Publication number: GB2294727A
Application number: GB9520378A
Authority: GB
Inventors: Helge Havnes
Original assignee: SPILKA INTERNATIONAL Ltd A
Current assignee: SPILKA INTERNATIONAL Ltd A
Priority date: 1994-10-05
Filing date: 1995-10-05
Publication date: 1996-05-08
Anticipated expiration: 2015-10-05
Also published as: DK175457B1; NO180090B; SE9503449L; NO943717D0; NO180090C; SE507005C2; GB2294727B; NO943717L; GB9520378D0; DK111295A; SE9503449D0

Abstract

A link arm assembly, for a window sash rotatable in opposite support arms 23 about a central pivot axis 24 through an angle of from 0 to 180 degrees, includes first and second link arms 18, 20 pivotably supported by a common member 15. The movement of the assembly is restricted by locking means comprising a locking member 26 connected with one of the link arms and with either the support arm or the common member 15. The locking member 26 includes one of a guide pin and groove (27, 28 fig 2). The guide pin is permanently located within the groove, which has an arresting section 29 disposed between its opposite ends 28a, 28b. <IMAGE>

Description

A link arm armature for a turnable witidow arrangement.

The present invention relates to a link arm arr.a- ture for a turable window arrangement of the kind in which a window sash is capable of being rotated about a central pivot axis an angle of from OQ to 180 relative to a window frame, by means of two opposite link arm armatures, wherein said window sash is pivotable in the re specçive link arm armature in a first end of a support arm, the opposite end of which is supported by a first link arm and a second link arm, and wherein said support arm is pivotably supported at a first end of said first link arm respectively said second link arm and at the oppcsite end is pivotally supported in a common socket nember secured in the window sash, and wherein a selflocking locking means is capable of limiting the pivot movements of said arms in at least one of said link arm armatures to a restricted movement, said locking means comprises a locking member, one end of which being connected wth a selected one of said support arm and said socket member, and the opposite end of said locking mercer being connected with one of said link arms, whereas said locking member and said one link arn being provided with an individual one of a set of couperating guide means, comprising a guide pin moveable in a guide groove provided with an arrestino section.

It is possible to provide each of the link arm armatures with a separate, selflocking locking means. Of practical reasons, however, and in practically used solutions solely one of the armatures of turnable windows is provided with a selflocking locking means, whereas the other one is without such locking means.

The embodiment stated above is priorly known from NO 122 614. The selflocking locking means suggested therein has a vertically slidable locking member (drop lock) secured to the socket member and has a cooperating locking counterpart secured to and extending sidewise from said first link arm. Said locking member and said locking counterpart control pivotation of the window sash through a restricted pivot angle to and from closed position, in order to allow the window sash to be opened in various desired venting positions. Said pivotation angle is restricted to prevent children from falling through the window opening. In this relation such selflocking locking means is being called a "child safe lock".It is however possible to actuate an actuating means in said lock means manually to release the selflocking action, in order to pivot the window sash, say an angle towards 1800, to allow cleaning and polishing of the outer face of the window in a simple manner from inside cf the adjoining room.

In various other publications it is of different reasons suggested various constructions of such selflocking locking means in order to improve application of the object.

In NO 150 171 it is suggested to secure a locking member in the shape of a pin extending sidewise from said first link arm and to apply a locking counterpart in the shape of a weight loaded lever arm located on the support arm.

In NO 157 112 it is suggested to secure a locking member in the shape of a pin extending sidewise from said first link arm and to apply a locking counterpart in the shape of a weight loaded lever arm located on the socket member.

The previously suggested solutions have guide groove limited to such extent that it is active solely during a restricted pivotation of the window sash controlled by the selflocking locking means, whereas pivotat ion of the window sash over arbitrary greater pivotation angels is provided independently of the selflocking locking means upon a release of the latter.

Said selflocking locking means has so far only been required for great and middle-sized windows, whereas the same requirements has not been implemented for rather small windows due to the fact that the danger of a child falling out through such rather small window opening was deemed to be insignificant.

A main object of the present invention is in general to improve the selflocking locking means, i.e. to provide a locking means that is uncomplicated in production and has a simple operation and in addition is safe in use. In this respect it is of vital importance that it meets with the requirements of prescriptions (BS 6375) relating to required strength in operation. According to the present invention the aim is especially to secure a safe connection between the guide pin and the associate guide groove during all pivot movements of the window sash, i.e. during pivotation of the window sash in the restricted, normal venting positions, as well as during additional pivotation of the window sash outside of said restricted section.

The link arm armature of the present invention is characterised in that said guide pin is permanently located in said guide groove, and that the arresting section is located in a spacing between the opposite ends of said guide groove.

By means of the above stated solution of the present invention a basis is provided for efficient control of the various pivot movements of the window sash.

This enables prevention of malfunctions caused by missing mutual contact between the locking member and its counterpart member. In addition a basis is provided for a simple actuation of the locking means and a favourable constructional design of the locking means.

It is preferred according to the present invention that the guide groove with the associated arresting section is provided in said one link arm and extends substantially in the longitudinal direction thereof, and that the guide groove by preference is located at the lateral side facing towards the other one of said link arms.

This enables incorporation of the guide groove, including the arresting section, in said one link arm itself and by a corresponding dimensioning of said one link arm an efficient transmitting of load from the locking means to the socket member is secured directly through said one link arm.

Further it is preferred according to the present invention that the guide pin is supported at one end of said locking member, and that the opposite end of the locking member is pivotably supported in the support arm by a pivot pin at a location between said pivot axis of the window sash and a pivot axis of said one link arm.

By means of the latter embodiment a compressed, rather robust structure is provided, which will be efficient to use in relative small windows and also will provide for important advantages in rather great and middle-sized windows.

Further features of the present invention will be evident from the following specification, wherein reference is being had to the accompanying drawings, wherein: Fig. 1 is a vertical view of a turnable window with a link arm armature according to the present invention.

Figs. 2-5 are side views of the link arm armature of Fig. 1 in four different positions of the link arm armature.

Figs. 6 and 7 are vertical sections through the link arm armature of Fig. 1 illustrated in two different positions of the link arm armature.

In Fig. 1 is illustrated a window frame 10 and a window sash 11, with associated, not further shown window glass incorporated therein. The window sash 11 is secured to the window frame by means of two opposite link arm armatures 13, i.e. one on either side of the window sash 11. In the drawing is illustrated only one of the armatures 13, i.e. the armature 13 which is located on the side of the window sash facing towards the plane of the drawing, i.e. near the vertical, herein deleted side post of the window frame 10. The other armature 13 may be of substantially the same, but mirror like shape located near the opposite side post 10a of the window frame 10.

Of practical reasons it is preferred that only one, i.e. the one armature 13 illustrated in Fig. 1, is provided with a selflocking locking means 14, whereas the other armature 13 is without such locking means 14. In other words both armatures 13 may have the same shape as illustrated herein or alternatively the other armature may have an arbitrary shape that may cooperate with that of the illustrated armature 13.

In general the link arm armature 13 comprise a socket member 15 which represents a common support member for the rest of the armature arms 18,20,23 and the window sash 11. The socket member 15 is secured to the window frame 11 by means of fastening screws 16. On the socket member 15 is located a pivot pin 17 for pivotation of a first, lower end of a first link arm 18 and a pivot pin 19 for pivotation of a first, lower end of a second link arm 20.

The link arms 18,20 are linked to the upper end of the support arm 23 by means of a pivot pin 21 at a second, upper end of the link arm 18 respectively by means of a pivot pin 22 at a second, upper end of the link arm 20.

A pivot pin 24, which is located at the other, lower end of the support arm 23, is pivotable in the window sash 11 per se about a horizontal center axis 11a thereof, which center axis is coinciding with the pivot axis of the pivot pin 24. One end, i.e. the upper end illustrated in Fig. 1, is slidable engaged with a guide track 10b through a sliding member 11b which is pivotable in relation to the window sash 11 by a pivot pin llc.

The window sash 11 is accordingly at one of its ends provided with a pair of sliding members llb, i.e. one on either side of the window sash 11, in order to allow the window sash 11 to be pivotable in a spacing between the link arm armatures 13 substantially 1800 from normally closed to completely turned position. Accordingly, the window sash 11 is pivotable about the pivot axis 11a extending through corresponding pivot pins 24 in said two cooperating link arm armatures 13, which are located at either side of the window sash 11, whereas said one end of the window sash 11 via said sliding members 11b are arranged to slide in vertical direction within the window frame 10.

In a spacing between the pivot pin 24 of the window frame 11 and the pivot pin 21 of said first link arm 18 one upper end of a lock member 26 is pivotable by means of a pivot pin 25 on the support arm 23. In the embodiment illustrated herein the pivot pin 24 is located relatively close to the pivot pin 21. The other, lower end of the locking member 26 is provided with a guide pin 27 which is slidable in a guide groove 28 provided in said first link arm 18. In said guide groove 28 between a first, straight groove section 28a and an opposite second, straight groove section 28b an intermediate, substantially S-shaped groove section 28c is provided with an arresting section 29 for arresting said guide pin 27.Said locking member 26 and its associated guide pin 27 and parts of the link arm 18 with associated guide groove 28 and arresting section 29 provides altogether said selflocking locking means 14.

The link arm armature which is not further shown herein, may as mentioned above, be without locking means 14, i.e. it is possible to delete the arresting section 29 of the guide groove 28 or alternatively delete the locking member 26 and its guide pin 27. It is possible to delete also the guide groove 28 in the link arm 18.

The locking member 26 has, as illustrated in Figs.

2-5, an extension beyond the guide pin 27 to provide an actuation member 30, which is manually actuated to allow a positive lifting of the locking member in direction of an arrow A and accordingly movement of the guide pin 27 latterly out of the arresting section 29 of the guide groove 28.

In Fig. 2 the link arm armature 13 is illustrated in inactivated window position. Caused by the illustrated location of the locking member 26 between the pivot pin 25 and the guide pin 27 it is secured that the support arm 23 draws the guide pin 27 into correct position in the arresting section 29 in a direction illustrated by an arrow C, as shown in Fig. 3, by pivoting the window sash 11 from closed position (with the link arm armature 13 in the position illustrated in Fig. 2) to the venting position (as shown in Fig. 1) as illustrated with an arrow B.

The link arm armature 13 is illustrated in Fig. 3 in a "child safe" locked, venting position of the window sash 11, which position is secured by the locking means 14 caused by movements in the armature 13 between the positions illustrated in Figs. 2 and 3, whereas the guide pin 27 have been moved accordingly in the groove section 28a towards said arresting section 29.

After having released the locking means 14 by manually activation of the actuation member 30, causing movement of the guide pin 27 correspondingly as illustrated in Fig. 4, a forced movement of the guide pin 27 as illustrated with an arrow through said S-shaped section 28c and further through said second groove section 28b towards the opposite end thereof. In a position with the guide pin 27 moved into said opposite end section, the window sash 11 is pivoted 900 outwards from closed position, and by pivotation of the window sash an additional angle of 80-900 the guide pin is returned in the innermost section 28a of the guide groove 28. This result in provision of a mainly corresponding selflocking movement section of the window sash 11 at a pivot angle of 170-1800 from normally closed window position.This will be advantageous say in instances where the window glass is to be cleaned and polished at its normally outward facing face when this face is turned towards the adjoining room.

Due to want of space the groove section 28b extends close to the longitudinal axis 18a of the link arm 18 in parallelism with the latter axis. In order to secure an advantageous extension of the remainder guide groove 28, i.e. the extension of the S-shaped intersection 28c and the associated groove section 28a, said link arm 18 is provided with a sidewise extending portion 18a which is allowed to be pivoted at the underside of the link arm 20 near the lower pivot pin 19 thereof.

Of constructional reasons the link arms 18 and 20 are arranged in one and the same pivot plane, whereas the locking member 26 is arranged in a pivot plane between the pivot plane of the support arm 23 and the pivot plane of the link arms 18,20, such as illustrated in Figs. 6 and 7.

Claims

P A T E N T C L A I M S.

1. A link arm armature (13) for a turnable window arrangement of the kind in which a window sash is capable of being rotated about a central pivot axis an angle of from 0 to 1800 relative to a window frame (10), by means of two opposite link arm armatures (13), wherein said window sash (11) is pivotable in the respective link arm armature (13) in a first end of a support arm (23), the opposite end of which is supported by a first link arm (18) and a second link arm (20), and wherein said support arm (23) is pivotably supported at a first end of said first link arm (18) respectively said second link arm (20) and at the opposite end is pivotally supported in a common socket member (15) secured in the window sash, and wherein a selflocking locking means (14) is capable of limiting the pivot movements of said arms (18,20,23) in at least one of said link arm armatures (13) to a restricted movement, said locking means (14) comprises a locking member (26), one end of which being connected with a selected one of said support arm (23) and said socket member (15), and the opposite end of said locking member (26) being connected with one of said link arms (18,20), whereas said locking member (26) and said one link arm being provided with an individual one of a set of cooperating guide means (27,28), comprising a guide pin (27) moveable in a guide groove (28) provided with an arresting section (29), c h a r a c t e r i s e d i n that said guide pin (27) is permanently located in said guide groove (28), and that the arresting section (29) is located in a spacing between the opposite ends (28a,28b) of said guide groove (28).

2. Link arm armature in accordance with claim 1, characterised in that the guide groove (28) with the associated arresting section (29) is provided in said one link arm (18) and extends substantially in the longitudinal direction thereof, and that the guide groove (28) by preference is located at the lateral side facing towards the other one (20) of said link arms.

3. Link arm armature in accordance with one of claims 1-2, characterised in that the guide pin (27) is supported at one end of said locking member (26), that the opposite end of the locking member (26) is pivotably supported in the support arm (23) by a pivot pin (25) at a location between said pivot axis (lea) of the window sash (11) and a pivot axis (17) of said one link arm (18).

4. Link arm armature in accordance with claim 3, characterised in that said one link arm (18) in an end extension thereof beyond said guide pin (27) provides an actuating member (30) for manual release of the locking engagement between said guide pin (27) and said arresting section (29)

5. Link arm armature in accordance with one of claims 1-4, characterised in that the pivot plane of said locking member (26) is arranged between a common pivot plane of said link arms (18,20) and the pivot plane of the support arm (23), whereas the guide pin (27) of said locking member (26) protrude from the locking member (26) via said pivot plane of said link arms (18,20) laterally into the associated guide groove (28).

6. Link arm armature in accordance with one of claims 1-5, characterised in that the guide groove (28) is provided with a) a first relatively straight groove section (28a) for guiding of the window sash to and from actual venting positions, and b) a an opposite, second relatively straight groove section (28b) for guiding of the window to and from maximal, i.e. 180C outward pivoted position, and c) an intermediate substantially S-shaped groove section (28c) comprising said arresting section (29), that said second groove section (28b) extends in parallelism with a plane (18a) through opposite pivot axis (17,21) of the associated link arm (18), and that said first groove section (28a) and said substantially S-shaped groove section (28c) are located at a greater distance from the latter plane (18a) than said second section (28b).