Apparatus for laying and securing heavy electrical cables

• US 4,337,922 A
• Filed: 03/25/1980
• Issued: 07/06/1982
• Est. Priority Date: 03/27/1979
• Status: Expired due to Term

• Current Assignee: Mathias Streiff AG
• Original Assignee: Mathias Streiff AG
• Inventors: Streiff, Mathias, Schnyder, Peter
• Primary Examiner(s): Watson, Robert C.
• Application Number:
  US06/133,866
• Time in Patent Office: 833 Days
• Field of Search: 254/134.1 R, 254/134.3 FT, 254/134.5, 174/99 R, 174/41
• US Class Current: 254/134.3FT
• CPC Class Codes: H02G 1/08 through tubing or conduit, e.g. rod or draw wire for pushing or pulling inserting electrical cables into tubes using wallbores E21B17/206; for optical cables G02B6/4401
• CPC Class Codes: Y10S 174/13 High voltage cable, e.g. above 10kv, corona prevention
• CPC Class Codes: Y10T 29/49838 by stringing
• CPC Class Codes: Y10T 29/53696 Means to string

Abstract

For pulling a heavy cable into a cable duct, cable holders of which the configuration is adapted to the cross-section of the cable duct are secured to the cables at regular spacings. The cable is pulled into the cable duct by means of a draw wire which is secured to the cable holders and/or to the cable. The draw wire is then anchored at both ends under a tensile stress. In this way, the cable itself is no longer subjected to a tensile stress when it is being pulled into place, and the cable is held at a spacing from the inside wall of the cable duct by means of the cable holders.

Claims

1. Apparatus for laying and securing heavy electric cable in a cable duct, comprising at least one cable holder fastened with positive force engagement to the cable, said cable holder being connected with at least one draw and tensioning wire for pulling into and securing the cable in the cable duct, the cross section of the cable holder corresponding approximately to the cross section of the cable duct, said cable holder comprising fastening means for fastening the cable, a casing that surrounds the said cable and fastening means, and at least two radially disposed cross pieces that extend between and are connected with said fastening means and said casing, and wherein said at least one draw and tensioning wire is fixed to one of said cross pieces.

2. Apparatus as in claim 1, characterized in that the cable duct and the cable holder present generally circular cross sections.

3. Apparatus as in claim 1, characterized in that the cable holder presents three crosspieces disposed at about an angle of 120°

.

4. Apparatus as in claim 1, characterized in that the casing that surrounds the cable is bipartite, and in that the point of connection of the two casing parts is located adjacent the radially disposed crosspieces.

5. Apparatus as in claim 1, characterized in that the casing is provided at the outside with roller bodies distributed on the periphery of the casing.

6. Apparatus as in claim 1, characterized in that at least two cable holders and at least two tensioning wires are provided, and that a cable clamp is provided for holding the tensioning wires together between each two successive cable holders.