Cable pulling/feeding apparatus

• US 4,508,251 A
• Filed: 10/26/1982
• Issued: 04/02/1985
• Est. Priority Date: 10/26/1982
• Status: Expired due to Term

• Current Assignee: Nippon Telegraph and Telephone Corporation
• Original Assignee: Nippon Telegraph and Telephone East Corporation (Nippon Telegraph and Telephone Corporation), Showa Electric Wire and Cable Co (SWCC Corp.)
• Inventors: Sekiguchi, Nobuo, Harada, Kazuhiro, Ishikawa, Toshio, Tsuchiya, Yuzoh
• Primary Examiner(s): Jillions, John M.
• Application Number:
  US06/436,856
• Time in Patent Office: 889 Days
• Field of Search: 226/25, 226/43, 226/112, 226/172, 226/178, 254/268, 254/265
• US Class Current: 226/25
• CPC Class Codes: B65H 51/14 Aprons, endless belts, lattices, or like driven elements
• CPC Class Codes: B66D 3/003 using two or more cooperating endless chains
• CPC Class Codes: G02B 6/50 Underground or underwater installation; Installation through tubing, conduits or ducts
• 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

Abstract

A cable pulling/feeding apparatus comprises a fixed base, a cable pulling/feeding unit having a drive/brake unit for pulling or feeding a cable, a sensor supported on the fixed base so as to be movable in both directions in which the cable is pulled and fed for detecting a load imposed between the cable pulling/feeding unit and the fixed base and for generating an electric signal dependent on the load as detected, and structure for determining a load applied to the drive/brake unit in response to the electric signal when the cable is pulled or fed.

Claims

1. A cable pulling/feeding apparatus comprising:

a stationary base;

a carriage mounted through bearings on at least one stationary guide shaft mounted on said base for reciprocating movement and a pair of endless belts for frictionally engaging a straight run of the cable therebetween and cooperating to pull or feed the cable linearly therethrough, said endless belts being rotatably mounted on said carriage allowing reciprocating linear movement of said endless belts relative to said base, in the direction of the travel of the cable; and

a load cell slidably mounted on said guide shaft between said carriage and said base, for producing an electric signal which varies in accordance with pressure applied on said load cell.

2. The apparatus of claim 1 wherein said shaft is aligned in the direction of rotation of said endless belts.

3. The apparatus of claim 1 wherein each of said endless belts comprises a plurality of blocks contoured to grip the cable and a pair of chains, each link in said chain carrying, fastened thereto, one end of one of said blocks.

4. The apparatus of claim 3 wherein said blocks are rubber.