Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
  • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
  • H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling

Definitions

• the invention relates to an installation tube or cable protection tube for the laying of cables and lines and a device for producing such a tube with a pull cord already drawn.
• Installation pipes are increasingly being installed under plaster in new buildings, in order to be able to subsequently or after a longer period of time to pull in lines as required, without having to cut off the plaster.
• the installation pipe consists of flexible plastic or metal and contains a pull cord with the help of which electrical lines, connections tehentiv, phone's' on effeten, compressed air lines, Wasserschläu ⁇ che o. the like. shall be recovered.
• the pull cord has the advantage over steel belts of limited rigidity that are also used, that kinks and curvatures no longer interfere with the pull-in work, even with large pull-in lengths.
• DE-DS 24 11 156 proposes a method in which the installation pipe is cut open before the required length is cut off in such a way that the pull cord is not severed in the process.
• a piece of the installation pipe of approximately 10 cm in length is first cut out, whereby a piece of excess length of the pull cord is obtained, which is required at one end to fasten the lead wires to be drawn into the installation pipe, while the other end is necessary to be able to grasp the pull cord by hand.
• a stopper is fastened which prevents the pull cord from being accidentally pulled back when the installation pipe is laid.
• German utility model 79 36 836 is a protective tube for electrical cables, which accommodates in its interior a wire-shaped and therefore relatively stiff part, which should have a greater length than the protective tube itself, in order to be able to pull out a piece of sufficient length. This is achieved in that the wire-shaped part protrudes from the protective tube at both ends. The course of the wire-shaped part within the protective tube is not explained in detail.
• the invention has for its object to provide an installation pipe of the type specified, which can be easily cut to length at the dealer, in the workshop or on the construction site, without special precautions being necessary to avoid retreating to prevent the pull cord from entering the pipe.
• this object is achieved in the installation pipe of the generic type in that the pull cord is longer than the pipe receiving it and that this additional length is distributed uniformly inside the pipe. It has proven to be advantageous if the Switzerlandschn ⁇ r 'by at least one Third longer than the pipe.
• the advantage of the invention is that when a desired tube length is cut from a roll supply, no consideration has to be given to the pull cord, since this is much longer than the installation tube itself, so that after cutting through the end of the cord Pull cord can be detected without pulling the other end into the installation pipe.
• the additional length of the pull cord that exceeds the length of the installation tube prevents a slight or somewhat stronger pull at one end from pulling the pull cord back into the installation tube at the other end.
• a lubricant which facilitates the pulling in of the line is applied to the inner wall of the installation pipe.
• This lubricant can consist of grease, oil or - in the case of installation pipes made of oil-sensitive plastics - a lubricant, for example powdered.
• at least one end of the installation pipe has a clamping member for fixing the pull cord. With the help of the clamping members, the two ends of the pull cord can be secured in the installation pipe, for example during transport on the construction site, during laying work or before the lines are drawn in.
• the clamping member consists of an essentially cylindrical sleeve with a conically widening edge area.
• a bushing can be frictionally inserted or placed in or on the open end of the installation pipe, the end of the pull cord being clamped between the installation pipe and the bushing.
• the bottom at one end of the sleeve prevents dirt, moisture or the like from penetrating into the installation pipe.
• a cylindrical clamping sleeve is removably inserted into the conical edge region of the bush.
• this clamping sleeve With the help of this clamping sleeve, the end of the pull cord can be fixed in the bush, so that even if the bush is not fixed at the end of the installation pipe, pulling back of the pull cord into the installation pipe is avoided.
• this arrangement facilitates the localization of a plurality of lines, which will be discussed in more detail below.
• the pull cord can be subsequently pulled into each installation pipe. However, it is desirable to insert the pull cord already during the manufacture of the tube.
• FIG. 1 shows a schematic partial view of an installation pipe according to the invention
• FIG. 2 shows the enlarged sectional illustration of one end of the installation pipe of FIG. 1 after being cut to length
• FIG. 3 shows the cut end shown in FIG. 2 with the pull cord fixed there
• FIG. 4 shows the view of a modified exemplary embodiment for the clamping member removed from the end of the installation pipe, Figure 5 that inserted into the end of the installation tube
• FIG. 7 a variant of FIG. 6 and FIG. 8 a further variant of FIG. 6.
• FIG. 1 a part of an installation pipe 10 is shown schematically, which consists of flexible plastic and can be kept in the form of a supply roll at the dealer or at the construction site.
• a pull cord 12 is contained in the installation pipe 10, the length of which is substantially greater than the length of the installation pipe 10.
• the pull cord 12 can be introduced into the installation pipe 10 by compressed air, for example.
• FIG. 2 shows, on an enlarged scale, one end of the installation pipe 10 after being cut in a cutting plane 14.
• the pull cord 12 can be grasped and, according to FIG. 3, a piece can be pulled out of the installation pipe 10. Since, due to the great length of the pull cord 12, no pull is exerted on the other end of the pull cord, this effectively prevents the other end of the pull cord 12 from being pulled into the installation pipe 10.
• FIG. 3 further shows that the pulled-out end of the pull cord 12 can be secured by being clamped in by means of a bushing 16 which is frictionally placed on the end of the installation pipe 10.
• both the installation pipe 10 and the bush 16 are provided with a corrugated wall.
• smooth-walled versions are also possible.
• FIGS. 4 and 5 shows one end of a cut-to-length installation pipe 10 from which a piece of pull cord 12 has been pulled out.
• the end of the pull cord 12 is guided through a cylindrical adhesive sleeve 18, which is then inserted into a conically widened edge region 20 of an essentially cylindrical sleeve 26 with baths 22.
• the end of the pull cord 12 is fixed frictionally between the clamping sleeve 18 and the sleeve 26.
• the clamping member 24 designed according to FIG. 4 is particularly advantageous when several installation pipes 10 come from different directions in an installation box and a craftsman has to find out a specific installation pipe 10 without the help of another person.
• the craftsman goes there in such a way that it provides all the pull cords 12 with a clamping member 24 at the ends of the installation pipes 10 converging in the installation box and leaves them at equal distances from the ends of the installation pipes. Then he can pull on the pull cord 12 at the other end of the desired installation pipe, which can be far from the first end, in order to subsequently determine which of the clamping members 24 has been drawn closer to the first end.
• the clamping member 24 prevents the pull cord 12 from being pulled into the installation pipe 10 inadvertently.
• FIG. 6 shows in longitudinal section a device according to the invention which is suitable for producing an installation pipe 10 with an already integrated pull cord 12 (variant A).
• This device has a spray head 28 which is known per se and has a connecting channel 30 for supplying the plasticized material, for example a thermoplastic material such as polyvinyl chloride. Within the spray head 28, this material passes behind a partition 32 with radial spokes 34 into an outlet nozzle 36. A piece of pipe 44 is placed on the end of the outlet nozzle 36, which is behind the outlet nozzle 36 has a first plug 46 and a second plug 48 at its end. Between the two
• Sealing plug 46 and 48 has tube section 44 with radial outlet bores 54.
• a supporting air channel 40 opens into the spray head 28 in the radial direction, which is connected via a connection 42 to a compressed air source.
• the pressure generated is of the order of 1 bar.
• the supporting air channel 40 runs in an arcuate manner in order to then extend coaxially to the outlet nozzle 36.
• the circular arc shape can be worked into the partition 32 by erosion.
• the installation or cable protection tube 10 extruded via the outlet nozzle 36 is given its bellows-like shape in the area between the two sealing plugs 46 and 48 by endlessly circulating form matrices 38 distributed over the circumference.
• the compressed air flowing out of the supporting air channel 40 through the outlet bores 54 presses the still soft material against the correspondingly profiled segment surfaces of the molding dies 38.
• a conveying air duct 50 is formed within the supporting air duct 40 coaxially to the latter, which ends with the second sealing plug 48 and behind the supporting air duct 40.
• the conveying air duct 50 is also supplied with compressed air at its inlet 52, the pressure being substantially higher than in the supporting air duct 40, for example 10 bar.
• the pull cord 12 is guided into the conveying air channel 50 by a roller 56, the rotational speed of which can be adjusted, where it reaches the end behind the sealing plug 48 by the support of the conveying air. Since here the compressed air flowing out of the conveying air channel 50 flows at a lower speed to the end of the already finished tube 10, the pull cord 12 lies approximately helically on the inner wall of the more slowly moving tube 10, so that the desired, evenly distributed extra length of the pull cord 12 sets.
• the conveying air channel 50 can be easily expanded within the supporting air channel 40 and replaced by another in order to adapt it to the material used for the pull cord 12. Depending on the desired properties (tensile strength, tensile force or the like), this can consist of hemp, plastic, metal or other materials.
• FIG. 7 shows a variant of the spray head 28 without a support air duct (variant B). In order to produce the bellows shape for the tube 10, no compressed air is blown in, but the molding dies 38 have vacuum bores 58, some of which are indicated and via which the extruded material is drawn into the profile grooves on the inner sides of the molding dies 38.
• the supporting air is at the same time conveying air for the production of very thin tubes 10 according to variant A or B.
• only one channel 50 is also provided here, into which the conveying air of approximately 10 bar is introduced, which exits into the pipe 10 behind the sealing plug 48.
• the corrugation can be made with overpressure or underpressure.
• the channel 50 can extend in the axial direction through the spray head 28, while the connection channel 30 for the supply of the material opens laterally into the spray head 28. Inside the spray head 28, the channel 50 is protected against overheating via an annular space 60 filled with air.
• tubes 10 with a smooth outer wall.
• the form dies 38 can be replaced by smooth pulling rollers.

Landscapes

• Electric Cable Installation (AREA)
• Rigid Pipes And Flexible Pipes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6850145

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Citations (6)

• 1990
  • 1990-01-19 DE DE9000546U patent/DE9000546U1/de not_active Expired - Lifetime
• 1991
  • 1991-01-18 JP JP50307091A patent/JPH04505096A/ja active Pending
  • 1991-01-18 EP EP19910903150 patent/EP0473732A1/de not_active Withdrawn
  • 1991-01-18 WO PCT/EP1991/000088 patent/WO1991011045A1/de not_active Application Discontinuation
  • 1991-01-21 CS CS91122A patent/CS12291A2/cs unknown
  • 1991-01-21 IE IE018791A patent/IE910187A1/en unknown

Patent Citations (6)

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