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Title:
RAIL FOR SECURING A BAG HAVING A FREE EDGE ON A CEILING OR ON A WALL
Document Type and Number:
WIPO Patent Application WO/1992/006007
Kind Code:
A1
Abstract:
A rail (1; 21) for attachment of a filter bag (45) having at least one longitudinal edge (44) with a rim (49) under a ceiling or on a wall, said rail having a channel (10; 30) to receive the rim (49), the width of which is larger than the distance between the free edges (7, 8; 27; 28) of a first (5; 25) and a second rib (6; 26) defining the channel (10; 30). In order to insert the rim (49) crosswise in relation to the longitudinal direction of the channel (30) the first rib (25) is positioned movably in the rail (21) according to the invention so that the first rib (25) can be moved from a locked position into a neutral position. In the neutral position the distance between the free edges (27, 28) of the first (25) and the second rib (26) is so large that the rim (49) may be inserted into the channel (30) from one side hereof, whereas the mentioned distance in the locked position is so small that the rim (49) cannot be pulled out of the channel (30).

Inventors:
DANIELSEN FREDE (DK)
Application Number:
PCT/DK1991/000293
Publication Date:
April 16, 1992
Filing Date:
September 27, 1991
Export Citation:
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Assignee:
KE SAFEMATIC AS (DK)
International Classes:
F16B45/02; (IPC1-7): B65B67/12
Foreign References:
DE3134751A11983-03-10
DE286008C
DE543175C1932-02-01
DE439731C1927-01-19
CH136790A1929-11-30
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Claims:
C A I M S
1. Rail for attachment of a bag (45) having a free edge (44) under a ceiling or on a wall, wherein the rail (21) has a first (25) and a second rib (26) extending so that the ribs (25, 26) define a channel (30), the width of which is larger than a given distance (29) between the free edges (27, 28) of the ribs (25, 26), and wherein the bag (45) has an edge (44), which is adapted to be secured in the channel (30), the width (49) of said edge (44) being larger than the given distance (29) between the free edges (27, 28) of the ribs (25, 26), said first rib (25) being movable between a locked position, wherein the free edge (27) of the rib (25) is positioned in the given distance (29) from the free edge (28) of the second rib (26), and a neutral position, wherein the free edge (26) of the first rib (25) is positioned in the channel (30) and at a distance which is larger as compared to the free edge (28) of the second rib than the width (49) of the edge (44), characterized in that the rail (21) has an open longitudinal recess (38) of substantially circular section to receive a thickened part (43) located on the first rib and parallel to the free edge (27) hereof, the section of which part being complementary to the section of the longitudinal recess (38), whereby the distance between the thickened part (43) and the free edge (27) is adapted to the effect that the free edge (27) of the first rib (25) in its locked position is positioned in the given distance (29) from the free edge (28) of the second rib (26), and that the first rib (25) is provided with stop devices (42), which are adapted, in cooperation with the rail (21, 39), to prevent the free edge (27) of the rib to swing past the locked position and away from the channel (30).
2. Rail according to claim 1, characterized in that the thickened part (43) is made up of two longitudinal lips (47, 48) extending in part in a semicircle, as seen in a sectional view.
3. Rail according to claim 1 or 2, characterized in that the first rib (25) is made of elastic resilient material.
4. Rail according to any of the preceeding claims 13, characterized in that the first rib (25) is divided into sections which are placed end to end in the longitudinal recess (38) of the rail (21).
5. Rail according to any of the preceeding claims 14, characterized in that the rail (21) has longitudianl tongues (32, 33; 34, 35) of approximate semicircle shape to the effect that the tongues (32, 33; 34, 35) enclose open grooves (36, 37) having circular cross sections.
Description:
RAIL FOR SECURING A BAG HAVING A FREE EDGE ON A CEILING OR ON A WALL.

The invention relates to a rail for attachment of a bag having a free edge under a ceiling or on a wall, wherein the rail has a first and a second rib extending so that the ribs define a channel, the width of which is larger than a given distance between the free edges of the ribs, and wherein the bag has an edge, which is adapted to be secured in the channel, the width of said edge being larger than the given distance between the free edges of the ribs, said first rib being movable between a locked position, wherein the free edge of the rib is positioned in the given distance from the free edge of the second rib, and a neutral position, wherein the free edge of the first rib is positioned in the channel and at a distance which is larger as compared to the free edge of the second rib than that of the width of the edge.

DE Patent Specification No. 286.008 describes a device for holding a mail bag or similar bag in an open position on a wall in such a manner that objects may be placed into the mail bag without hindrance.

This known device has a body, which can be mounted on the wall, and the first rib comprises a first arm extending from the wall. A swivel arm is pivotally mounted on the free end of the first arm by means of an axle, and the swivel arm is spring-loaded against a locked position, from which position it can be swung into a neutral position sur¬ mounting the spring power.

The second rib, which is mounted below the first arm, con¬ sists of a second arm extending upwards in a curve against the free end of the swivel arm, whereby the first arm, the swivel arm and the second arm together define a channel.

The second arm ends in a surface which is directed up¬ wards towards the body. The end of the swivel arm bears against the body in the locked position in such a manner that the swivel arm is prevented from swinging from the locked position and away from the channel.

The longitudinal direction of the channel is of limited length in this known device, and consequently two devices are employed, mounted at equal distance on the wall, the distance being dependent upon the size of the mail bag.

In order to place the mail bag in position, the worker will take hold of its edge and push it towards the swivel arm against the elastic force inwards around the free edge of the swivel arm. The worker then lets go his hold of the edge of the mail bag so that the elastic force may cause the swivel arm to return to the locked position, whereby the edge of the mail bag will be pressed firmly between the free edge of the swivel arm and the mentioned surface of the second arm.

Now the mail bag is hanging down from the devices in an open position, ready to be filled up.

When the mail bag is full and thus must be disengaged, a locking handle is released, whereby the second arm, which is hinged pivotally to the body, will drop down under the influcence of the grativational force, and the edge of the mail bag is disengaged.

A similar device for holding a bag in an open filling position by firmly pressing together part of the opening edge of the bag is described in DE Printed Specification no. 31 34 751.

This known device too, is of limited length in respect of the longitudinal direction of the channel, the length having been adapted in accordance with the size of the opening of the bag.

In ventilation systems the injection of air into the rooms is often supplied through filter bags of permeable material to the effect that the air is emitted from the big surface of the filter bag, thus avoiding discomfort caused by draught, and this is especially important for example in companies, where the injection into the rooms of cold air is required in consideration of perishable articles produced, or where cool air is injected into the room during the warm season in consideration of a comfortable working climate. The filter bags are also used where the air must be free of dust and bacteria.

The air is injected into the room through an air pipe branch in the ceiling or in a wall, and the filter bag is fitted appropriately to the ceiling or the wall.

In order to achieve a proper tight fit a so-called D-filter bag is used, that is, the filter bag has two longitudinal edges provided with rims, the edges being positioned at such distance from one another in relation to the periphery of the filter bag that partly a short portion and partly a longer portion of the periphery are defined between the edges. Preferably the short portion consists of a fine- meshed material, while the longer portion is made of an air-permeable material.

This D-filter bag is then suspended in two parallel rails so that the short portion is suspended along the ceiling or the wall, while the longer portion will hang down from the ceiling, respectively stand out from the wall in a curve as a result of the pressure of the injected air.

A known rail consists of an extrudable material, for example aluminium, wherein the first and the second rib are joined in a stiff connection so that the distance between their free edges is determined once and for all. The rail has further a flange serving to attach the rail under a ceiling respectively on a wall, said flange extending sidewards from the ribs under an angle.

By using a D-filter bag and two rails of the above de¬ scribed kind it is possible to conceal the attachment flanges of the rails behind the filter bags, when the attachment flanges face one another.

When the filter bag is to be attached to the known rail it is necessary to insert the edge provided with the rims from the end of the rail, which is rather cumbersome since the rail with its filter bag must be quite long in order to produce a sufficiently big permeable filter surface for circulation of air.

This will cause considerable difficulties in itself be¬ cause the filter bag consists of a comparatively coarse- fibred material in consideration of permeability, and this coarse-fibred material may easily be caught by the inlet edges of the rail or by burrs left during cutting of the rail into the desired length. This insertion method is also very time-comsuning and thus costly as it can only be accomplished from one end of the rail.

In many cases it is preferable for esthetic reasons that the rail and the filter bag extend under the ceiling from wall to wall, respctively on a wall from the floor to the ceiling.

In such cases the filter bag my be removed only, for

example for periodic cleaning, if the attachment of the rail is visible and accessible beside the filter bag, which is undesirable for esthetic reasons and precisely what is sought to be avoided by using the D-filter bags and two rails, with the attachment flanges facing one another and being hidden behind the D-filter bag.

In addition, the use of D-filter bags and two rails will cause difficulties during installation, unless at least one end of the rail has at some point a specially formed section, which is detachable, whereupon the filter bag may be removed through the end of the remaining rail portion, or unless the rail and the filter bag are separable at one connecting point at least.

Such section or connecting point, however, will imply a connection which is undesirable as well, since it is difficult to make the section and the rail exactly flush in the longitudinal direction, among other things because ceilings and walls are not always even enough. In addition hereto such a connection will appear awkward as compared to the appearance otherwise of the rail and the filter bag.

It should be added that inlet pipe branches through the ceiling or the wall cannot be installed or connected with the filter bag in a secure manner, if the filter bag must be inserted into the rail from one end thereof.

It is therefore an object of the present invention to pro- vide a rail which permits attachment as well as removal of a D-filter bag under the ceiling or on a wall irrespectively whether the rail and filter bag are to ex¬ tend from wall to wall under a ceiling, or from floor to ceiling on a wall, since the design provides for a filter bag and a rail extending without connections of any kind and without the attachment flanges on the two rails used

being visible or accessible, and wherein a reliable connection between the filter bag and the inlet pipe branch can be established.

This object will be achieved by means of a rail of the kind described in the introduction, which rail has an open longitudinal recess of a substantially circular section to receive a thickened part located on the first rib and parallel to the free edge hereof, the section of which part being complementary to the section of the longitudinal recess, whereby the distance between the thickened part and the free edge is adapted to the effect that the free edge of the first rib in its locked position is positioned in the given distance from the free edge of the second rib, and that the first rib is pro¬ vided with stop devices, which are adapted, in cooperation with the rail, to prevent the free edge of the rib to swing past the locked position and away from the channel.

With this design of the rail, two rails can be attached in parallel under a ceiling or on a wall, even if the rails are of a length which corresponds to the distance between two opposite walls or the distance from the floor to the ceiling in a room, and the D-filter bag may then be connected to the inlet pipe branch for air intake and finally be inserted into the two rails with the rim of the two longitudinal edges in its respective channel, and the D-filter bag may be removed from the rails for periodic cleaning or inspection without having the need to remove the rails partly or completely.

It should be added that none of the devices, which are de¬ scribed in the above mentioned specifications, DE Patent Specification no. 286.008 and DE Printed Specification no. 31 34 751 are suitable for use in connection with D-filter bags for air intake in a room.

In addition, the rail of the invention is far easier and less expensive to produce than the prior art devices, of which the device known from DE Patent Specification no. 286.008 in particular has a very complicated structure.

The rail of the invention holds a D-filter bag in place along its entire edge to the effect that the edge of the D- filter bag will not hang like a festoon in curves, which would be the case using the known devices.

It should also be noted that stop devices in the locked position is pressed against the rail at the same time as the parallel thickened part is attached to the inner side of the open longitudinal groove, whereby the first rib is effectively tight in relation to the rail. Thus any leaks between the D-filter bag and one or more connecting devices in a ceiling or on a wall will not cause unintentional outflow of unfiltrated air into a room.

It is further advantageous as a materials saving measure that the thickened part of first rib is made up of two longitudinal lips, which extend partly in a semi-circle as seen in a sectional view.

For installation purposes it is advantageous that the first rib is made of elastic, resilient material, in order to make it possible to insert the thickened part of the first rib in the longitudinal recess of the rail, as the two lips constituting the thickened part, may be squeezed elastically together during the insertion. By appropriate dimensioning of the remaining parts of the first rib, the first rib will have a reasonable degree of stiffness in any case so that the rim of the filter bag is held se- curely in place in the channel.

Advantageously the first rib may be divided into sections which are received at equal distance in the channel of the rail, and it is thus possible to insert respectively remove short sections successively, which will facilitate the handling of long filter bags.

Finally, it is advantageous that the rail has longitudinal tongues of approximate semi-circle shape so that the tongues enclose open grooves of circular section, thus pro- viding the possibility of controlling two rails, which are to be placed end to end, as this control can be provided by the insertion of short round guide pins into the half holes of the attachment flanges of the rails and it is also possible to insert end pieces therein.

The rail of the invention will be explained in more detail in the following with reference to the drawings, wherein

Fig. 1 shows a lateral section of a prior art rail;

Fig. 2 shows a lateral section of a rail according to the invention, wherein a first rib is in a locked position; and

Fig. 3 shows a lateral section as in fig. 2 but with the first rib in a neutral position.

The prior art rib, which is shown in lateral section in fig. 1, is produced in long profiles preferably by extrusion of, for example aluminium.

The rail 1 has an attachment flange 2, which may be pro¬ vided with holes for nails or screws, whereby the rail can be fastened under a ceiling or on a wall.

The attachment flange 2 is connected at one edge to a

narrow connecting portion 3 under a certain angle, and the second edge of the connecting portion 3 is connected to the middle of a body 4, the said body extending along the edges in a first 5 and a second rib 6, said ribs being inclined towards each other in a distance from the body 4 so that their free edges 7, 8 are positioned at a small distance from one another thus forming a longitudinal opening 9.

The body 4 and the two ribs 5, 6 thus enclose a channel 10, which is open at the opening 9.

The mentioned angle between the attachment flange 2 and the connecting portion 3 as well as the width of the last men- tioned are adapted so that the body 4 and the connected edge of the first rib 5 will be flush with a surface 11 of the attachment flange 2, whereby the mentioned edge will have a tight fit with a ceiling or a wall after the rail has been fastened thereto.

This rail is adapted for attachment of a so-called D- filter bag, preferably made of a narrow piece of compara¬ tively fine-meshed material, which is thus almost air- impermeable, and a wider piece of course-meshed material, which is air-permeable.

These two lengths of material are sewn together along their opposite edges around a resilient long object, for example an app. 4 mm thick plastic cord, whereby the edges sewn together will have a rim.

The diameter of the long resilient object, the thickness of the materials and the rim formed thereby are adapted so that the opening 9 on the rail 1 of an edge of the bag with the rim can be secured by the two ribs 5, 6, when the edge in question of the bag has been inserted into the

channel 10 of the rail from the open end of the rail.

With two rails 1 having being attached under a ceiling or a wall in parallel with one another and at appropriate equal distance, the two edges of a D-filter bag may be inserted in the longitudinal direction of the rails from one end thereof, and as a result of the proportion between the widths and the narrow and wider pieces of the material, the wider material will hang down in a curve under the ceiling, while the narrow piece, assuming a reasonable distance between the two rails 1, may be suspended between the rails.

Thus, the filter bag suspended under a ceiling will have a D-shaped cross section.

The filter bag is properly connected to at least one inlet pipe branch for injection of air, which is to be distributed in the room, wherein the filter bag is placed.

The inlet pipe branch may be positioned either at the end of the filter bag or it may lead to the filter bag through an appropriate opening in the narrow material directed to¬ wards the ceiling.

If this known D-filter bag is placed on a wall, its section will also be D-shaped when air is injected through the filter bag.

The most important drawback in this known rail is that the edges of the filter bag must always be inserted into the channel from one end thereof, which is a time-consuming and cumbersome task, and it is impossible to remove the filter bag for periodic cleaning and inspection, if the filter bag and the rail are to extend from wall to wall in a room.

Fig. 2 and fig. 3 illustrate the cross section of a rail according to the invention, which rail 21 makes it possible to insert the edges of the filter bag into the rail or to remove the filter bag from a longitudinal channel 30 in the rail in a direction at right angles to the longitudinal direction of the channel.

The rail 21 has an attachment flange 22, which may serve to attach the rail under a ceiling or on a wall, and the en- tire rail 21 is adapted to be produced by extrusion like the prior art rail 1.

The attachment flange 22 is also provided with longitudinal tongues 32, 33 and 34, 35 of such shape that open grooves 36, 37 having circular sections are produced.

If a ceiling is so long that the provision of two or more rails 21 placed end to end is called for, the precise alignment of the rails 21 may be achieved by the provision of pipe sections or cylinders having a section which is complementary to the grooves 36, 37.

The grooves 36, 37 may also serve to secure an end piece, which is not illustrated in the drawings, if the rail 21 is not intended to adjoin a wall.

In addition, the ribs 32-35 serve to increase the bending moment of the rail 21 in a per se commonly known manner.

The first rib 25 on the rail 21 is formed as a separate element, which is fitted in a swivel bearing of a body 24 on the rail 21.

For this purpose the body 24 has an open longitudinal recess 38 of substantially circular section, said recess being formed by a first 39 and a second branch 40 having

a distance between their free edges.

The second rib 26 of the rail 21 extends outwards from the body 24 so that together with the first 25 rib it may enclose the mentioned channel 30, which should be of such dimension that the first rib 25 can swing into the channel with its free edge 27.

The first rib 25 is shaped like a two-armed lever bar, wherein the arms 41, 42 are of different lengths, the longer arm 41 with its free edge in a locked position, which is described below, being directed to the free edge 28 of the second rib 26, and the shorter arm 42 extending opposite of the first arm 41 and in extension thereof.

At the transition between the short 42 and the long arm 41 the first rib is connected to a thickened part 43, which has a cross section complementary to the longitudinal re¬ cess 38 to the effect that the thickened part by its en- gagement with the recess 38 may constitute an axle which will allow the first rib to swivel on the rail 21.

When the thickened part 43 is in engagement with the recess 38, the first rib 25 is movable in relation to the rail 21 between a locked position, wherein the free edge 27 of the longer arm 41 of the first rib 25 is directed towards the free edge 28 of the second rib 26 and at a predetermined distance from here, producing a longitudinal opening 29 between the edges 27, 28, and a neutral position, wherein the longer arm 41 extends into the channel 30.

The locked position is shown in fig. 2, and it will be seen that the first rib 25 can hold the edge 44 of a D-filter bag 45 in place, of which only the part next to the edge 44 is illustrated. The material of the filter ' bag 45 is sewn together around a longitudinal object 46 such as a plastic

cord to the effect that a rim 49 is produced on the edge 44, said rim having a width which is larger than the width of the opening 29.

The short arm 41 bears against the first branch 39 in the locked position so that the first rib 25 is prevented from moving past the locked position, as it is moved from the neutral position to the locked position. It is thus pre¬ vented that the rim 49 on the filter bag 45 might open the first rib 25, by pulling the filter bag, to an extent that the filter bag 45 is released. The first rib 25 may further be blocked against movement by an additional measure in thar the end of the short rib 42 may be exactly adapted to bear against the ceiling or the wall, upon which the rail 21 is mounted, when the first rib 25 is in the locked position.

In the neutral position, which is shown in fig. 3, the longer arm 41 on the first rib is directed towards the channel 30, which is of such dimension that an opening is produced between the first rib 25 and the free edge 28 on the second rib 26, the width of which is larger than that of the rim 49 on the edge 44 of the filter bag 45. In this neutral position the rim may therefore be inserted into the channel 30 or removed therefrom.

For installation purposes it is advantageous to form the first rib 25 of elastic resilient material such as plastic so that with a longitudinal slit in the thickened part 43 the two lips 47, 48 may be pressed together along the thickened part to a degree that the thickened part 43 can be squeezed crosswise into the longitudinal recess 38 of the rail 21.




 
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