DOOR

Abstract: Door, particularly for large doorways, comprising a door leaf that is suspended from the upper edge of the doorway and that comprises a continuous sheet in a single or several layers (17, 18) that are attached to a series of lateral braces (13-16) at a common distance from each other in the vertical direction of the doorway. The lateral braces run at their ends in a generally vertical guide profile (12), and from the upper edge of the doorway in a downward direction there is a hoisting organ (19-22) comprising lines or belts. Each lateral brace (13-16) has an attached hoisting organ (19-22), where the hoisting organs are connected both upwards an downwards. The upper hoisting organ (22) is connected to a winch (32) in a known manner.

Description: Door The invention comprises a door of the type indicated in the introduction to Claim 1. Background In various connections there is need for a door that can cover large openings that is lightweight, and that has a simple, inexpensive construction. Norwegian patent specification 136110 describes a door that has a hoisting wire for raising the door, which is fed through the separate lateral braces and fastened to the lowermost lateral brace. When this door is raised, the first lateral brace is raised first while the rest of the door is motionless until the lateral braces below are raised towards the upper lateral brace. This means that the lateral braces are forced together, squeezing the fabric between them, which can cause a number of problems. In the closed position the individual lateral braces will load the fabric and thereby stretch it. There is a general need to improve this existing type of door. Objectives The main object of the invention is to provide such a type of door, that is not as detrimental to the fabric in the door, that particularly avoids squeezing the fabric when the door is raised and opened. A specific object of the invention is thus to design a hoisting system that avoids using the fabric in the door as a supportive element and eliminates squeezing the fabric between the various lateral braces. A second object is reducing the loading on the hoisting unit so that the height of the opening can be as large as required. A further object is to avoid excessive loading of the fabric when the lateral braces are in an open position. Invention The present invention has made it feasible to realize the main object by designing the door in accordance with the characterizing part of Claim 1. Further advantageous features of the invention are stated in the subsidiary claims. Example The invention will be described in more detail with reference to the drawings, where Fig. 1 shows a front perspective sketch of a section of the door in accordance with the invention in a schematic presentation, with four fabric segments, Fig. 2 shows a section through the door in Fig. 1 in the closed position, Fig. 3 shows an equivalent section as in Fig. 2, but with a partly raised door, Fig. 4 shows a section that gives a detailed illustration of the hoisting mechanism, while Figs. 5 and 6 show schematic front perspective sketches of two alternative forms of design. In Fig. 1 there is a front perspective of part of a doorleaf 11 and an adjacent guide profile 12 that is statically mounted at the edge of the doorway. The door leaf 11 in the example comprises four horizontal beams or lateral braces 13, 14, 15, 16, counted from the bottom upwards. The lateral braces 13-16 have pulleys (not illustrated) fitted at each end that are mated with equivalent grooves in the guide profile 12. On the outside of the lateral braces 13-16 a fabric 17 is attached in an appropriate manner, that can either be one continuous sheet or jointed pieces for each lateral brace. In an equivalent manner the door leaf 11 is covered internally by a second fabric 18, so that there is a layer of air between the two fabric sheets 17, 18 that can improve the thermal insulation of the door. The lateral braces 13-16 can be designed as is appropriate. They can be lattice braces, struts or other forms of support, and made of lightweight metals, steel or composites, for example. Separate hoists 19-22 for each lateral brace 13-16 respectively, are used to raise the individual lateral ■ braces 13-16. Hoist belt 19 for the lowest lateral brace 13 is attached to the lateral brace by means of a pulley 23 i 5 that in the example is located on upper edge of the lateral brace 13 and mounted with appropriate fittings, such as a bracket 24. From pulley 23, the hoist 19 leads upwards and is attached to the lower edge of the next lateral brace 14 at attachment point 25. The top hoist 22 is attached at 34 10 to the upper edge of the doorway. The other lateral braces have similar pulleys 26-28. The individual hoists 19-21 for the three lower lateral braces 13- 15 are attached at their free ends to the hoist belt above, respectively 20-22 on the outside of the pulleys 15 in relation to their respective attachment points. This is illustrated by attachment point 29, shown in detail in Figure 4. The upper hoist 22 is led to a pulley 30 on a lateral support 31 above the doorway and from there to a winch 32 on 20 the upper edge of the guide profile 12. The hoist system can in principle be used as an individual design for smaller doors and in tandem or multiple configurations for wider doors. It is advantageous, but not compulsory, to place a stop 25 on each hoist belt, this will connect with the specific hoist when the lateral brace reaches its lowermost position. This will enable the lateral brace to be suspended from the fixed end of each hoist belt, which consequently avoids transferring loading due to weight to the fabric. 30 Figs. 2 and 3 show how the hoists 19-22 are located in « the space between the two fabrics 17 and 18 so that they are # concealed from sight and any outside interference. * Fig. 4 shows how the hoist belts are joined together by rivets 33 at attachment point 29. 35 The embodyments shown can be modified in a number of different ways. The hoist belts can be replaced by twine, line, chain or something similar. The arrangement shown will enable an arbitrarily high door to be raised through winding the hoisting unit a distance that is twice the distance of the gap between two lateral braces. An important advantage of the invention is that thehoisting components can be made of a non-flammable material such as steel wire, which will thereby keep the individual lateral braces in place in the case of fire. The system described above will be unable to fully utilize the lifting height, this is because of the gearing between each lateral brace. An alternative is that the door is built with diminishing distance between the lateral braces from the bottom and upwards. In addition, the winch 32 must be designed to raise half the weight of the door. Fig. 5 shows an alternative design. Above the lower lateral brace 13 there is an in-built reduction gearing between lateral braces 14-15 and 15-16 and between the upper lateral brace 16 and the lateral support 31 above the doorway. This gearing system comprises a rising number of return pulleys 28, 28 , 28 , 28 , for hoist wire 20-21. The return pulleys are located alternately on the lateral braces below and above, respectively and on the lateral support above the doorway. This design necessitates the insertion of a longer length of hoist belt, however, it makes a corresponding reduction in the lifting force necessary. With the insertion of a length of belt that is equal to the height of the doorway plus the distance between two neighbouring lateral braces, all the lateral braces can be completely raised. If gearing is used, the lifting force can also be reduced so that the winch can be designed accordingly. Fig. 6 shows an alternative design where all hoist belts 19-22 are through a return pulley on the upper lateral brace, respectively on the lateral support above the doorway, and from there down to a common attachment point 34' on the lower lateral brace 13. This makes the length of all the hoist belts 19-22 the same and they can be winched in equally and give complete hoisting of all lateral braces. In this example the winch 32 is placed at the bottom edge of the doorway away from the guide profile 12. As an alternative to the configuration in Fig. 1, a separate belt can be led from the upper winch drum to each of the lateral braces. This can be done by a hoist belt being led directly to the lower lateral brace and that the hoist to the lateral brace above is led to a further return pulley for each of the lateral braces above, according to the principle illustrated in Fig. 5 and described in accordance with this. This design will give even loading on all hoists so that they can have equal dimensions. If the loading on the hoists is to be reduced, a return pulley can be added for each hoist belt.

Claims: Claims 1. Door, particularly for large doorways, comprising a door leaf that is suspended from the upper edge of the doorway and that comprises pieces of fabric or a continuous sheet in a single layer or several layers (17,18) that are attached to a series of lateral braces (13-16) that are at a common distance from each other in the vertical direction of the doorway, and where each end is controlled in a vertical guide profile (12), and where from the upper edge of the doorway connected to a hoisting device (32) there is a hoisting organ (19-22) in a downward direction comprising lines or belts, for attachment to each lateral brace (13-16), c h a r a c t e r i z e d by the hoisting organs (19-22) being connected to a hoisting device (32) so as to have equal pulling velocity and being connected to the lateral braces (14-16) above the lower one (13) by means of pulleys (23, 26- 28) that provide a common upper lifting limit for the respective lateral braces, and the transfer of the loading due to weight to the upper edge of the doorway. 2. Door in accordance with Claim 1, c h a r a c t e r i z e d by the hoisting organs (19-22) being connected to each lateral brace (13-16) by means of pulleys (23, 26-28), in that the free end of the hoisting organ is attached at a lateral support above, respectively at the upper edge of the doorway. 3. Door in accordance with Claim 1, c h a r a c t e r i z e d by the hoisting organs (19-22) being led through an increasing number of pulleys (28 ,-28 ) from the lower lateral brace (13) and upwards. 4. Door in accordance with Claim 1, c h a r a c t e r i z e d by the individual hoisting organs (19-22) being led through pulleys and down to a common attachment point (34 ) on the lower lateral brace (13). 5. Door in accordance with Claim 1, c h a r a c t e r i z e d by a hoist belt or similar being led from an upper winch drum down to each of the lateral braces, and where each hoist to a lateral brace above the lowest is led through at least one return pulley more than the hoist to the lateral brace below, and where the hoist to the lowest lateral brace can be led directly to this lateral brace by means of a return pulley that is connected to the upper lateral support.

Inventors: AABEL LASSE, AABEL, LASSE
Applicants: AABEL LASSE, AABEL, LASSE
Application year: 1992
Main classification: E06B3
IPC codes: E06B9