Cable pulling system and a method of pulling a cable using the system

Abstract

The disclosure relates to a cable pulling system being used in a cable laying construction. The cable pulling system of the disclosure can pull a cable from a cable drum loaded on a trailer to an underground duct without unloading the cable drum from the trailer. The cable pulling system comprises a cable drum rolling device configured to rotate the cable drum, a cable guider configured to guide the cable from the cable drum to the conduit, and a caterpillar configured to pull the cable guided through the cable guider from the cable drum and to convey the cable to an underground duct.

1 - 9 . (canceled) 
   
   
       10 . A cable pulling system for pulling a cable from a cable drum without unloading the cable drum from a trailer, comprising:
 a cable drum rolling device configured to fix the cable drum in a transportation state and to roll the cable drum in an installation state, wherein the cable drum rolling device is located beneath the cable drum;   a cable guide configured to guide the cable unwound from the cable drum rolled by the cable drum rolling device; and   a caterpillar configured to pull the cable from the cable drum, through the cable guide and to convey the cable to an underground duct.   
   
   
       11 . The cable pulling system of the  claim 10 , wherein the cable drum rolling device comprises:
 at least one stopper configured to fix the cable drum at both sides in the transportation state; and   at least one roller configured to support the cable drum and to roll the cable drum with power generated by at least one motor in the installation state;   a pair of springs configured to give an elasticity to the cable drum.   
   
   
       12 . The cable pulling system of the  claim 10 , further comprising:
 a moving guide located beneath the caterpillar and configured to guide the horizontal movement of the caterpillar according to a direction of the unwound cable.   
   
   
       13 . The cable pulling system of the  claim 12 , further comprising:
 a height adjuster located beneath the moving guide and configured to adjust the height of the caterpillar, wherein the height adjuster moves the caterpillar upward and downward according a height of the unwound cable.   
   
   
       14 . The cable pulling system of the  claim 11 , wherein the moving guide comprises a guide rail configured to guide the caterpillar, wherein the guide rail is curved along an arc and keeps the caterpillar and the unwound cable in a straight line. 
   
   
       15 . A method of pulling a cable during an installation of cabling, the method comprising:
 loading a cable drum on a trailer towed by a tow car and fixing the cable drum;   transporting the trailer near an underground duct and unfixing the cable drum;   rolling the cable drum without unloading the cable drum from the trailer and unwinding the cable wound on the cable drum; and   pulling unwound cable with a caterpillar to convey the unwound cable to the underground duct.   
   
   
       16 . The method of  claim 15 , further comprising:
 guiding the unwound cable to the caterpillar with a cable guide.   
   
   
       17 . The method of  claim 15 , further comprising:
 adjusting the height of the caterpillar according the height of the cable guided by the cable guide toward the caterpillar.   
   
   
       18 . The method of  claim 15 , further comprising:
 adjusting the horizontal position of the caterpillar to keep a line between the unwound cable and the center of caterpillar straight.