GB2122675A

GB2122675A - Vertical slat blinds

Info

Publication number: GB2122675A
Application number: GB08317490A
Authority: GB
Inventors: Pier Luigi Menichetti
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-06-29
Filing date: 1983-06-28
Publication date: 1984-01-18
Also published as: GB8317490D0; EP0098146A3; IT8217722A0; EP0098146A2

Abstract

A vertical slat blind comprises a rail (1), pulley blocks (15), an endless draw cord (2) and vertical blinds (5) suspended from small discs (3) which rest on both runs of the draw cord (2). The under surface (30) of the discs (3) may be serrated and a master slider (25) is non-slidably attached to one run of the draw cord (2). The discs (3) are preferably linked by flat strips (14) with a lengthwise slot (26) engaged by a cranked T-element (30) of an adjacent strip. To draw back the blinds the master slider (25) under the action of draw cord (2) moves the discs (3) successively into contact, the strips (14) sliding one beneath the other. To move the blinds(S) in the reverse direction the master slider (25) pulls its attached disc (3), successive discs (3) being pulled by linking strips (14). Rotation of the blind slats is achieved by frictional engagement between the disc (3) and the draw cords. <IMAGE>

Description

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GB 2 122 675 A 1

SPECIFICATION

Apparatus for suspending vertical blinds

The present invention relates to a device for rotation of vertical blind strip and for moving the 5 said blinds along a horizontal rail member.

It is known to suspend vertical blinds, carried on slidable blind supports from a horizontal rail and to move the blinds along the rail by means of an endless cord operated from one end of the rail 10 by a hanging loop. The cord passes round a pulley, at the opposite end of the rail and one run is connected to a lead slider supported situated furthest away from the looped end. Adjacent blind supports are connected by sections of chain or 15 cord of equal length such that each support will pull adjacent support in a direction away from the operating end to draw the blinds across a window. The blinds are withdrawn across the window by the lead slider causing adjacent supports to close 20 up one against the other.

In order that the blinds may be rotated about a vertical axis, for example between a position at right angles to the window and position substantially parallel to the window, the supports 25 are frequently provided with gear wheels operated by a rod at the operating end of the rail.

The known devices are consequently generally complicated bulky and expensive to install.

It has been proposed in British Patent 30 Publication No. 2.077.828A to simplify the arrangement by supporting each blind on a vertical disc having convex lower face. Opposite ends of a diameter of the said face resting on a respective parallel run of the draw cord. Rotation 35 of the blinds is achieved through frictional contact between the edge portions of the convex surface and the draw cord. In order for sufficient frictional force to be available it is necessary that the discs have large diameter and in order for the blinds to 40 be brought together at one end of the rail the discs are required to overlap each other.

The present invention overcomes the bulky nature of known systems and the need for sliding support discs to overlap by utilising support disc 45 elements which are relatively small in diameter and which have flat lower surfaces that engage on, and make frictional contact with, opposite runs of the draw cord, the surface of the discs providing sufficient friction to allow the discs to be rotated 50 when one cord is pulled. Because the discs are of small diameter it is not necessary that they be stacked, i.e. overlap, when the blinds are withdrawn.

A further disadvantage of known systems lies in 55 the use of a chain or cord joining adjacent support members. Because the chain or cord is flexible it loops when the blinds are withdrawn to one side and may cause jamming by becoming locked between the blind support member and the rail. 60 From another aspect therefore the invention provides an improved form of device for linking adjacent blinds which comprises an elongate member of a rigid material having a closed slot extending lengthwise to a first end portion thereof,

a second non-slotted end portion, a locating means formed at said second end portion and capable of slidably engaging within the slot of an adjacent member, a said disc element being positioned, for rotational movement about a vertical axis, at said second end portion and between said locating means and an end of said slot whereby, when the blinds are together, the locating means of one member slides along the slot of an adjacent member causing the said first member to slide along the slot of an adjacent member until it is in engagement with the opposite end of the said slot causing the one said member to slide over the adjacent said member and to allow the support discs to close one against the other; when the blinds are drawn in the opposite direction, the said first member slides to the opposite end of the slot in the said second member whereafter it causes the said member and associated disc element and blind to move in the same direction.

The said locating means is preferably in the form of a T-shaped section having a cranked stem of smaller diameter than the slot of an adjacent member whereby the stem is enabled to move along the said slot.

The invention will now be more fully described with reference to the accompanying drawings in which:

Figure 1 is a part sectional perspective representation of one apparatus according to the present invention;

Figure 2 is an exploded representation of a blind and an associated support member of figure 1;

Figure 3 is a part sectional perspective representation of a preferred apparatus according to the present invention;

Figure 4 is a section through A—A of figure 3;

Figure 5 is a section through B—B of figure 4;

Figure 6 is a diagrammatic representation of a portion of the blind carrying discs and linking members to figure 4;

Figure 7 is a diagrammatic representation of one linking member and associated support disc of figure 5 viewed from the other side.

Referring to figures 1 and 2 of the drawings. A rail 1, formed from extruded aluminium and having a width of 30 mm, comprises front and rear C-shaped channels 7 and a centre channel 8. Each end of the rail is closed by a block 15 that includes a pulley 16 (or other bearing surface) inlet and exit slots 17 alignea with channels 7 and a transverse slot 18 formed in the lower surface of the block 1 5.

An endless draw cord 2 extends from the right hand end of the rail along channels 7, through slots 17 and round pulley 1 6, of the left hand pulley block, back along the rail through slots 17 in the right hand pulley block and out through slot 18 to form a downwardly extending loop 20.

Vertical blind carrying discs 3, formed of nylon and having a diameter of 24 mm, are located within the rail and extend across the rail into each channel 7 to rest upon both runs of draw cord 2.

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GB 2 122 675 A 2

The lower surfaces 30 of discs 3 are serrated to improve the grip between the draw cords and the discs (Fig. 7).

Vertical blind strip 15 is carried by hangers 11 5 attached to reinforcing plates 12 at the top edge of the said blinds, the said hangers 11 being non-rotatably attached to the under side of discs 3. Weights 13 are contained in pockets formed at the lowermost ends of blinds 1 5 to improve 10 frictional contact between the underside of the discs 3 and the draw cords 2 on which the discs rest.

Adjacent discs 3 are linked by a chain member 4 attached to spacer 10 which locates on 15 upwardly directed pegs 9 mounted on support discs 3 and which move along centre channel 8. Spacers 10 permit rotation of the said discs without concomitant rotation of the chains. The length of the chain between spacers determines 20 the maximum distance apart of the blinds when drawn across a window. A master slider (shown at 25 in figure 3) extends across the rail into each channel 7 and is attached to a free end of a chain 4. One side of slider 25 is non-slidably located on 25 one run of draw cord 2 for movement therewith and the opposite side rests on the other run of draw cord 2.

Movement of slider 25 in the direction right to left in figure 1, effected by pulling on the left hand 30 cord in loop 20, causes the blinds to move across the window. Movement of the slider in direction left to right in figure 1, effected by pulling the right hand cord in loop 20, causes the slider first to move against the left hand disc 3 and then to 35 move the said disc 3 along the rail aga'nst the adjacent disc and so on until the blinds have been withdrawn to the right hand end of the rail. Because the discs are of a small diameter the blinds can be maintained in the withdrawn 40 condition without need for overlapping.

The initial pull on the right or left hand cords in loop 20 results in all discs 3 being rotated in a clockwise or anti-clockwise direction respectively until adjacent blinds contact each other thus 45 preventing further rotation, continued pulling then results in the slider and the supports being moved as previously described.

In the preferred embodiment of the invention illustrated in figures 3 to 7, chain 4 of figures 1 50 and 2 is replaced by disc linking members 14 consisting of a thin strip element 24, formed of brass, and containing a closed lengthwise slot 26 extending to end 27. End 28 of element 24 contains an unsiotted portion to the underside of 55 which is pivotally attached, through pin 19, a disc 3 of free rotation about a vertical axis. The centre of disc 3 lies 13 mm from the end of slot 26.

End 28 of element 24 contains cut out portions 29 forming a T section 30 to the stem 31 of the T 60 terminating 13 mm from the centre of disc 3.

Stem 31 is cranked and has a width dimension smaller than slot 26 in element 14 thereby enabling the cross head of T section 30 to be inserted through slot 26 of an adjacent member 65 and the members to link together and lie flat in substantially the same horizontal plane.

In this embodiment master slider 25, as shown in figure 6, is slidably located on a link member 24 by pin 40 and washer 41 whereby the slider is enabled to move along slot 26. The length of slot 26 in the member 14 carrying the master slider 25, is arranged such that the movement of the slider from one end of the slot to the other under the influence of a draw cord allows the blinds carried by the discs to be rotated through approximately 360° through frictional contact of the cords on the underside of the discs.

The linking member 14 may of course be formed of a material other than brass, e.g. of a plastics material, similarly the discs may be formed from materials such as neoprene and the track of an extruded plastics material such as PVC.

With the blinds in the position shown in figure 3, i.e. transverse of the rail, pulling the right hand end of loop 20 will cause discs 3 and associated blinds 5 to rotate in an anticlockwise direction until adjacent blinds contact each other and prevent further rotation. At the same time master - slider 25 will slide along slot 26 in the linking member 14 until it reaches the end of the slot at which point it will contact the disc attached to the linking member. Further pulling on the cord will result in the disc being moved along the rail and the first member to alide beneath the adjacent member to which it is linked until the first disc contacts the next disc in line. This next disc will then be caused to move along the rail and its linking member will slide beneath the next adjacent member. The operation will then be continued until all of the discs and associated blinds have been moved to one end of the rail. A pull on the left hand cord in loop 20 will then cause the discs and blinds to rotate in a clockwise direction into a desired position.

When the blinds are to be drawn across a window from the last mentioned position, the left hand cord of loop 20 is pulled. Initially the discs and blinds are caused to rotate in a clockwise direction until adjacent blinds cont ct each other and prevent further rotation. At the same time the master slider 25 is pulled along the rail away from the adjacent disc. When the locating means of the slider linking member reaches the end of the slot in its adjacent member it will pull that member and associated disc and blind across the window. The process will then be repeated until the discs and blinds have been drawn as far as required. A pull on the right hand cord will then cause the blinds to rotate into any desired position, e.g. into a position transverse to the rail.

Since the linking members 14 are able to slide one beneath the other there is an absence of jamming and the blinds can be moved smoothly backwards and forwards across a window.

The arrangement of the present invention is compact and simple to erect and operate.

The rail may be attached to a suitable surface by means of appropriately designed brackets (not shown) that engage in grooves 31 formed in the upper face of rail 1.

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Claims

1. A vertical blind system comprising a rail; means carrying a vertical blind for movement along the rail and for pivotal movement about a

5 vertical axis; means to rotate said blind about said vertical axis, means linking adjacent blinds whereby the maximum distance apart of said blinds is fixed and movement of one blind along the rail in one direction pulls an adjacent blind in 10 the same direction; a draw cord looped along the length of the rail; a master slider attached to free end of a said linking means and one run of a loop of said draw cords, whereby the slider carrying means and blinds can be caused to move along 15 the rail by the action of said draw cord; wherein the means carrying each said blind comprises a small disc element to which a blind is non-rotatably attached, having a planar lower surface, said surface being in frictional contact with both 20 runs of the draw cord, whereby initial movement of the draw cord causes the disc elements and associated blinds to rotate about a verticl axis.

2. A vertical blind system according to claim 1 wherein the planar lower face of each said disc

25 element is serrated.

3. A vertical blind system according to claim 1 or claim 2 wherein the means linking adjacent blinds comprises an elongate member of rigid material having a closed slot extending lengthwise

30 to a first end portion thereof, a non-slotted second end portion and a locating means formed at said second portion and capable of slidably engaging within the slot of an adjacent member, a said disc element being positioned for rotational 35 movement about a vertical axis, at said second end between said locating means and an end of said slot, whereby when the blinds are drawn together the locating means of one member slides along the slot of an adjacent member until it is in 40 engagement with the opposite end of the said slot causing the one said member to slide over the adjacent said member and to allow the carrying disc elements to close one against the other and when the blinds are drawn in the opposite 45 direction, the said first member slides to the opposite end of the slot in the said second member whereafter it causes the said member and associated disc element and blind to move in the same direction.

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4. A device according to claim 3 wherein the master slider is located at said second end of a said linking member, the length of the slot in said member being sufficient to allow rotational movement of the blinds through approximately 55 360° during movement of the said master slider from one end of the slot to the other under the influence of the said draw cords.

5. A vertical blind system substantially as herein described with reference to figures 1 and 2

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6. A vertical blind system substantially as herein described with reference to figures 3—7 of the drawings.

Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1984. Published by the Patent Office, 25 Southampton Buildings, London, WC2A 1AY, from which copies may be obtained.