ELASTICAL MEMBER AND A METHOD TO APPLY AND/OR REMOVE THE SAME IN A CONDUIT WITH AN OPEN OR A CLOSED CROSS SECTION

Abstract: Elastical member (4, 14) and a method to apply this into a conduit (3, 13) with an open or a closed cross-section, at which the elastical member (4, 14) adapted in the conduit is brought to exert forces at a right angle upon the walls of the conduit (3, 13), and to remove the elastical member (4, 14) from the conduit (3, 13), so that its exerting of forces upon the walls is abolished, at which a pulling force is attached in the longitudinal direction of the elastical member (4, 14) causing an increased stress by which a tension will be caused in its longitudinal direction and a contraction will be caused in its cross-direction, so that the cross-section of the elastical member (4, 14) will be smaller than the cross-section of the conduit (3, 13), and by which the elastical member (4, 14) can be brought into, respectively out from the conduit (3, 13) with no or a low friction against the walls of the conduit (3, 13).

Description: ELASTICAL MEMBER AND A METHOD TO APPLY AND/OR REMOVE THE SAME IN A CONDUIT WITH AN OPEN OR A CLOSED CROSS SECTION TECHNICAL AREA The present invention is related to a method to apply an elastically tensile member into a conduit with an open or a closed cross section, at which the elastical member adapted in the conduit is brougt to exert forces at a right angle upon the walls of the conduit, and to remove the elastical member from the conduit so that its exerting of force upon the walls is abolished. The inven¬ tion also includes an elastical member per se by which the method to apply respectively remove the member in accordance with the invention can be carried out. BACKGROUND TECHNOLOGY Long elastically tensile members are known above everything from embodiments where the member forms a sea¬ ling between two surfaces. The Swedish patent publication no 201 241 describes a long, tubular, elastical member which is intended to form a sealing between two parts. Another long elastical sealing member is shown in the Swedish patent publication no 313 223. Another long elas¬ tical sealing member is shown in the german patent publi¬ cation no 814 355. The american patent publication no 3 992 846 shows a joint between two panels, at which the panels show profile parts, which are intended to be slided into each other along the joint. The profile parts are hooked together by being moved at a right angle to the surface of the panel and then pushed in a direction parallel to the surface of the panel so that locking members will en¬ gage into each other and prevent the panel from moving at a right angle to the plane through the surface. A long conduit is formed along the joint and will be filled up with a hardening material which prevents the panel parts to move in the plane through the panel. A disadvantage with this joint is that the panels not can be separated after the hardening material has been filled into the conduit at the joint. The international publication WO 82/02751 shows a method and a tool to get an air-tight closing between two foils. The foils are put together and brought down into a groove which shows an opening along its length. An air-tight hose after that is brought into the groove and exposed to an overpressure at which the two foils will be pressed against the walls of the groove. A disadvantage with this closing-method is that overpressure always has to be maintained inside the hose which can be difficult to achieve for a long time. DESCRIPTION OF THE INVENTION The aim of the present invention is to achieve a method to apply an elastical tensile member in a conduit whith an open or a closed cross section, at which the elastical member adapted in the conduit is brought to exert forces at a right angle upon the walls of the con¬ duit, and to remove the elastical member from the conduit so that its exerting of force upon the walls is abo¬ lished. The aim is also to achieve an elastical member per se by help of which the method in accordance with the invention can be carried out. The aim has been achieved by a method which is characterised in that a pulling force is attached in the longitudinal direction of the elastical member cau¬ sing an encreased stress by which a tension will be cau¬ sed in its longitudinal direction and a contraction will be caused in its cross-direction, so that the cross-sec- tion of the elastical member will be smaller than the cross-section of the conduit, and by which the elastical member can be brought into, respectively out from the conduit with no or a low friction against the walls of the conduit. The elastical member is preferably pulled out from the conduit in steps, by which every step includes a tension of the elastical member at stress until a slipping is caused against the walls of the conduit, followed by a contraction of the elastical member until stresslessness. In a preferred form of the invention, the elas¬ tical member is brought into the conduit doubled by help of a string or the similar, which at its one end shows a loop or the similar, from which the elastical member extends in two parts. The other end of the string is brought through the conduit after which the pulling force is attached at this end of the string. The elasti- cal member also can be brought into the conduit by help of a clamping member, which at the pulling into the con¬ duit is brought to clamp one end of the elastical member, by wich the clamping member is attached at one end of a string, which other end is brought through the conduit. After that the pulling force is attached to the string as been described above. The elastical member in accordance with the in¬ vention is characterised in that it shows one or several parts by which inner sliding-faces will be achieved, and at which the parts of the elastical member can slide mu¬ tually when pulled through the conduit. The elastical member preferably shows two or several parts, each with a closed cross-section. In an alternative embodiment of the invention the elastical member consists of two parts, each with a closed, semi-cirkular cross-section between which a sli- ding-face is arranged. Alternatively the elastical member can show a cross-section, wich is partially slotted into sliding-faces, which extend from the center part of the member a bit out against its envelope surface. The elastical member preferably consists of rub¬ ber, which have a contraction of maximum 30 % at a ten¬ sion in its longitudinal direction. By that a simple adaption of the elastical member in the conduit will be achieved on the same time as the securing capability of the elastical member in the conduit will be sufficiant. The elastical member also can consist of a rubber profile, which is mantled with a net-formed stoc¬ king made of metal strings. In this performance the elas¬ tical member will give an electrical connection e.g. bet¬ ween panels which will be mounted together. Such a con- nection can be wished at shielding from magnetic fields and the similar. The elastical member also can consist of e.g. a corrugated leaf spring or the similar, which at lengthe¬ ning shows a contracion, which causes a decreasing cross- -section. Such a spring also can be made of e.g. metal or plastics. DESCRIPTION TO FIGURES The invention is described below in respect of embodiments and with reference to the attached figures. Figure 1 shows a joining of two sheets, provided with profiles along their edges, by help of the inven¬ tion. Figure 2 shows a joining of two thin sheets or foils by help of the invention. Figure 3 shows a joining of two panels where the joint is hidden from both sides. Figure 4 shows a profile bar combined with an elastical member in accordance with the invention, which together form a structural member. Figure 5 shows the bringing of a double elasti¬ cal member with a circular cross-section into a conduit with a rectangular cross-section schematically. Figure 6 shows the bringing of a double elasti¬ cal member with a semi-cirkular cross-section into a con- duit with a cirkular cross-section schematically. Figure 7 shows the bringing of a elastical mem¬ ber with six parts into a conduit with a cirkular cross- -section schematically. Figure 8 shows a string provided with clamping members for bringing an elastical member into a conduit. Figure 9 shows the end of an elastical member, which is provided with a socket for an attachement member on a pulling-string. Figure 10 and 11 shows alternative embodiments of elastical members in accordance with the invention. Figure 12 shows an alternative embodiment of the invention at casting of objects which are provided with holes. On figure 1 two sheets 1 and 2 is shown, which have different profiles at their edges. When joining the sheets along their edges, the two profiles are placed in the way that they form a conduit 3. An elastical tensile member 4 is lengthened in that way that its thickness decreases by contraction and makes it possible to bring the member through the opening 5. This embodiment requi¬ res a certain stability of the sheet material, especially if a tight joint between the sheets are wished on the same time as the fixing of the sheets. On figure 2 a sheet- or foilmaterial 7 without any stability in itself is attached in an outer profile bar 6, which also is used as a holding-up at the expan- sion of the member 9 after being attached or at a strut¬ ting of some of the members 7 or 8 to move out from the conduit 10. In order to get a joint with high require¬ ments of strength, a profile bar 6 also can be used to¬ gether with a sheet 2 as shown on figure 1. Hereby an elastical member, which generates a considerable higher cross-force or which has pronounced jointing qualities, can be used depending on what is required from the joint. On figure 3 another embodiment of the invention is shown, which preferably can be used at joining of modules of sheet, which can be provided with single or double walls. Two modules 11 and 12 are provided with projections/not¬ ches, which in the jointing position cooperate to provide a closed conduit 13. At the two outwardly directed side limitations 11a, 11b respectively 12a, 12b, the projec- tions in each module will engage into the adjacent module to provide a locking against a movement in a cross-direc¬ tion between the modules. Instead of projections/notches, the side limitations can be provided with layers for in¬ creasing of friction or the similar. An elastical member 14 shall at mounting be attached to a special pulling member, which will first be placed in the conduit 13, af- ter which the contraction of the member 14 will occur by tensioning. After that the member 14 will be brought into the conduit and be allowed to expand during a fase of re¬ ducing of its length in order to generate joining forces which are directed in a right angle to the length of the member. In figure 3 the member 14 is shown with a par¬ tially slotted cross-section, by which internal sliding faces is achieved inside the member. This slotting has been made in order to facilitate for the member to recap- ture its original shape in the conduit. During this ex¬ pansion the friction between the walls of the conduit and the envelope surface of the member will increase succe- sively. The heigh of the generated friction will depend on partial irregularities on the sides of conduit and on the envelope surface of the member. The irregularities can in its turn be caused by pollution, grease, different grades of working etc. In order to reduce the risk for the member to get stuck during its length contraction, the member is partially slotted in its cross-section, which causes that the member becomes a capability to pass such parts, where the friction appears to be high, by in¬ ternal sliding. On figure 4 a profile bar 15 is shown together with an elastical member 16. By inclining the two flanges 15a, 15b against the centerline of the bar, these do not tend to collapse, but tend to curve inwardly instead, which will occur during compression of the member 16. The load bearing capacity at the profile bar provided with the elastical member will be considerably improved com- pared with a profile bar without the elastical member. Eventually the profile bar can be provided with flanges 15c and 15d which are directed in opposite directions compared with the flanges 15a and 15b. On figure 5a, 5b an elastic member 17 with a cirkular closed, cross-section is shown, which will be brought in double parts into a conduit 18 with a rectan- gular, closed cross-section by help of a string 19 which is brought into the conduit in double parts. The double elastical member 17 will be pulled into the conduit 18 by help of the string 19 upon which a pulling force will be attached. On figure 6a, 6b an elastical member 20 with a semi-cirkular, closed cross-section is shown, which is brought in double parts into a conduit 21 by help of a string 22, which at its one end is provided with a rigid, hook-like loop e.g. of steel. The two parts of the elas- tical member 20 thereby are arranged with their flat sur¬ faces facing each other, causing the member 20 to fully fill up the cross-section of the conduit 21. On figure 7a, 7b three elastical member 23 is shown, each with a cirkular, closed cross-section, which are brought in two parts into a conduit 24 with a cirku¬ lar cross-section by help of the string 22 according to figure 6a. On figure 8 a clamping member 25 is shown which, when brought into a conduit 26, is forced to clamp one end of an elastical member 27. The clamping member 25 is attached to one end of a string 28, which is brought through the conduit 26 and upon which a pulling force is attached. On figure 9 an elastical member 29 is shown at which one end a socket 30 is arranged, which is provided with a threaded hole 31, which extends in the length di¬ rection of the member 29. A pulling tool 32 provided with a threaded tap 33 is intended to be attached to the soc¬ ket 30 by help of which the elastical member 29 will be pulled through a conduit with a cirkular, closed cross- -section. On figure 10 an elastical member 34 with a cirkular, closed cross-section is shown, which is sur¬ rounded by a stocking 35 of metal strings. The stocking 35 is attached to the elastical member 34 at its ends, whereby it becomes the same tension and contraction when pulled as for the elastical member 34. On figure 11 an elastical member formed as a leaf spring 3 is shown, which is sinusoidal corrugated along its elongation. At extension of the spring, the height of the sinus waves will be reduced so that the spring can be brought into a conduit without resistance. On figure 12 a cylindrical elastical member 37 is shown, which is arranged in a casting mould for con¬ crete before the concrete 38 has been brought into the mould, not shown on the figure. The elastical member 37 is provided with a cylindrical hole along its center line, into which a rigid cylindrical bar 39 is brought before the elastical member 37 is brought down into the mould. After the concrete 38 has hardened the elastical member 37 will be pulled out together with the bar 39. Eventually the bar 39 is first pulled out from the elastical member 37 and after that the elastical member37 out from the concrete 38.

Claims: PATENT CLAIMS 1. Method to apply an elastically tensile mem¬ ber (4, 14) into a conduit (3, 13) with an open or a closed cross-section, at which the elastical member (4, 14) adapted in the conduit is brought to exert forces at a right angle upon the walls of the conduit (3, 13), and to remove the elastical member (4, 14) from the conduit 3, 13), so that its exerting of forces upon the walls is abolished, c h a r a c t e r i s e d in that a pulling- -force is attached in the longitudinal direction of the elastical member (4, 14) causing an encreased stress, by which a tension will be caused in its longitudinal direc¬ tion and a contraction will be caused in its cross-direc¬ tion, so that tr. cross-section of the elastical member (4, 14) will be smaller than the cross-section of the conduit (3, 13), and by which the elastical member (4, 14) can be brought into, respectively out from the con¬ duit (3, 13) with no or a low friction against the walls of the conduit (3, 13). 2. Method in accordance with claim 1, c h a ¬ r a c t e r i s e d in that the elastical member (14) is pulled out from the conduit (13) in steps, by which every step includes a tension of the elastical member at stress until a slipping is caused against the walls of the con- duit (13), followed by a contraction of the elastical member (14) until stresslessness. 3. Method in accordance with claim 1-2, c h a ¬ r a c t e r i s e d in that the elastical member (20) is brought into the conduit (21) doubled by help of a string (22), which at its one end shows a loop from which the elastical member (20) extends in two parts, that the other end of the string (22) is brought through the con¬ duit (21 ) and that the pulling force is attached at the string (22). 4. Method in accordance with claim 1-3, c h a ¬ r a c t e r i s e d in that the elastical member (27) is brought into the conduit (26) by help of a clamping member (25), which, at the pulling into the conduit, is brought to clamp one end of the elastical member (27), that the clamping member (25) is attached at one end of the string (28), that the other end of the string (28) is brought through the conduit (26) and that the pulling force is attached to the string. 5. Elastical member (14, 20) aimed to be brought into or out from a conduit (13, 21) with an open or a closed cross-section, at which an pulling force is attached at the elastical member (14, 20) in its length direction causing an encreased stress by which a tension is achieved in its length direction and a contraction in its cross-direction, c h a r a c t e r i s e d in that this member (14, 20) shows one or several parts by which inner sliding faces will be achieved, at which the parts of the elastical member can slide mutually when pulled through the conduit (13, 21). 6. Elastical member (17, 23) in accordance with claim 5, c h a r a c t e r i s e d in that it shows two or several parts, each with a closed cross-section. 7. Elastical member (20) in accordance with claim 5-6, c h a r a c t e r i s e d by two parts, each showing a closed, semi-cirkular cross-section between which a mainly flat sliding face is arranged. 8. Elastical member (14) in accordance with claim 5, c h a r a c t e r i s e d in that it shows a partially slotted cross-section with sliding faces which extend from the center part of the member a bit out against its envelope surface.

Inventors: LINDGREN LENA, LINDGREN, LENA
Applicants: LINDGREN LENA, LINDGREN, LENA
Application year: 1985
Main classification: E04B1
IPC codes: B29C65, F16B5