Abstract:
This invention is directed toward a system for driving a wire loop cutting element. More particularly, the disclosed invention employs a frame and pulleys to drive a wire loop cutting element.

Description:
FIELD OF THE INVENTION 
   This invention is directed toward a system for driving a wire loop cutting element. More particularly, the disclosed invention employs a frame and pulleys to drive a wire loop cutting element. 
   BACKGROUND OF THE INVENTION 
   Prior art systems exist for cutting subsea structures. One such system is disclosed in U.S. Pat. No. 5,361,748 to Matteucci. Prior art cutting systems have employed multiple component cutting means comprising pulleys, a cutting blade and related structure, which must move so as to traverse the diameter of the object to be cut. The movement of such multiple component cutting means is often cumbersome and requires significant clearance on multiple sides of the object to be cut. 
   The present invention overcomes such drawbacks by providing a cutting system wherein traversal of the diameter of the object to be cut by a multiple component cutting means is not required. 

   
     DESCRIPTION OF THE DRAWINGS 
       FIG. 1   a  is a top view of an embodiment of the invention during the initial phase of a cutting operation. 
       FIG. 1   b  is a top view of an embodiment of the invention during the middle phase of a cutting operation. 
       FIG. 1   c  is a top view of an embodiment of the invention during the final phase of a cutting operation. 
       FIG. 2   a  is a rear view of the present invention with the pulleys in the retracted position. 
       FIG. 2   b  is a rear view of the present invention with the pulleys in the extended position. 
       FIG. 3  is an isometric view of an embodiment of the invention. 
       FIG. 4  is a side view of an embodiment of a first drive wheel, first drive wheel axle, and first drive wheel motor disclosed herein. 
       FIG. 5  is a side view of an embodiment of a first pulley and first pulley axle disclosed herein. 
       FIG. 6  is a side view of an embodiment of a clamping device disclosed herein. 
       FIG. 7  is a top view of an embodiment of an upper plate disclosed herein. 
       FIG. 8  is a top view of an embodiment of the loop wire cutting blade disclosed herein. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   As shown in  FIGS. 1   a - 1   c  and  3 , a first preferred embodiment of the invention comprises a frame  10  comprising a lower plate  12   a  comprising right arm  13   a  and left arm  15   a  defining a lower central gripping region  14   a . The frame further comprises a bracket  16  connected to the lower plate, and an upper plate  12   b  connected to the bracket. The upper plate comprises two pulley slots  20 , a right arm  13   b  comprising a first drive wheel axle opening  22 , and a left arm  15   b  opposite the right arm, comprising a second drive wheel axle opening  24 . The right and left arms define an upper central gripping region  14   b  in substantial longitudinal alignment with the lower central gripping region, as shown in  FIG. 1   a.    
   In another preferred embodiment, the frame further comprises a buoyant member  26 , as shown in  FIG. 3 . In a preferred embodiment, the buoyant member is foam. 
   As shown in  FIGS. 1   a - 1   c ,  3 , and  4 , a first preferred embodiment of the invention further comprises a first drive wheel  28  coupled to a first drive wheel axle  29  rotatably mounted in the first drive wheel axle opening. A first preferred embodiment of the invention further comprises a second drive wheel  30  coupled to a second drive wheel axle rotatably mounted in the second drive wheel axle opening. The structure and connection of the second drive wheel, second drive wheel axle and second drive wheel motor are the same as that shown in  FIG. 4  for the first drive wheel, first drive wheel axle and first drive wheel motor. 
   A first preferred embodiment of the invention further comprises a first drive wheel motor  32  attached to the frame and operatively coupled to the first drive wheel axle. A first preferred embodiment of the invention further comprises a second drive wheel motor attached to the frame and operatively coupled to the second drive wheel axle. 
   A first preferred embodiment of the invention further comprises a clamping device  36  attached to the frame and positioned such that it can clamp objects to be cut in a fixed position in the central gripping regions, as shown in  FIG. 3 . In another preferred embodiment, the clamping device comprises a first clamping arm  37  comprising a first end and a second end opposite the first end, as shown in  FIG. 6 . In this preferred embodiment, the clamping device further comprises a second clamping arm comprising a first end and a second end opposite the first end. In this preferred embodiment, the clamping device further comprises a first clamping pad  38  attached to the first end of the first clamping arm, and a second clamping pad attached to the first end of the second clamping arm. In this preferred embodiment, the clamping device further comprises a hydraulically powered motor  42  operatively coupled to the second ends of the first and second clamping arms, as shown in  FIG. 6 . The structure and configuration of the second claiming arm and second clamping pad are the same as that shown in  FIG. 6  for the first claiming arm and first clamping pad. 
   In another preferred embodiment, the clamping device is attached to the frame and positioned such that it can clamp objects to be cut in a fixed position in the central gripping regions. In this embodiment, the clamping device comprises a first clamping arm on one side of the central gripping region and a second clamping arm on the other side of the central gripping region. 
   As shown in  FIGS. 1   a - 1   c , and  5 , a first preferred embodiment of the invention further comprises a first pulley  44  comprising a first pulley axle  45  mounted in the first pulley slot  20 , and a second pulley  46  comprising a second pulley axle  47  mounted in the second pulley slot  20 . The structure and configuration of the second pulley and second pulley axle are the same as that shown in  FIG. 5  for the first pulley and first pulley axle. 
   A first preferred embodiment of the invention further comprises a pulley positioning system attached to the first and second pulleys for varying the separation distance between the first and second pulleys. In another preferred embodiment, the pulley positioning system comprises a threaded translation member  48  operatively coupled to the first and second pulley axles such that rotation of the translation member is a first direction causes the separation distance between the first and second pulleys to increase, and rotation of the translation member in a second direction opposite the first direction, causes the separation distance between the first and second pulleys to decrease. In this preferred embodiment, the pulley positioning system further comprises a hydraulically driven motor  50  operatively coupled to the translation member, such that the motor can cause rotation of the translation member in the first direction or in the second direction. In another preferred embodiment, the pulley positioning system comprises a threaded drive rod  48  coupled to the first and second pulleys for varying the separation distance between the first and second pulleys. 
   In another preferred embodiment, the invention further comprises a continuous loop wire cutting blade  52  extending around the outer periphery of the first and second pulleys and the first and second drive wheels, as shown in  FIGS. 1   a - 1   c , and  8 . In another preferred embodiment, the invention further comprises tungsten carbide cutting elements  53 . In another preferred embodiment, the cutting blade comprises a diamond wire, as shown in  FIG. 8 . 
   In another preferred embodiment, the invention comprises a first idler wheel axle port  41  in the upper plate right arm, and a second idler wheel axle port  43  in the upper plate left arm, as shown in  FIGS. 1   a - 1   c ,  3  and  7 . In this preferred embodiment, the invention further comprises a first idler wheel  55  comprising a first idler wheel axle  56  rotatably mounted in the first idler wheel axle port, and a second idler wheel  57  comprising a second idler wheel axle  58  rotatably mounted in the second idler wheel axle port, as shown in  FIGS. 1   a - 1   c , and  3 . 
   In another preferred embodiment, the invention further comprises a continuous loop wire cutting blade extending around the outer periphery of the first and second pulleys and the first and second drive wheels, and further engaging the first and second idler wheels on the sides of the idler wheels facing the upper central gripping region. In this preferred embodiment, the cutting blade comprises tungsten carbide cutting elements. 
   The foregoing disclosure and description of the inventions are illustrative and explanatory. Various changes in the size, shape, and materials, as well as in the details of the illustrative construction may be made without departing from the spirit of the invention.