Boom assembly of machine

Abstract

The present disclosure provides a load carrying member for a machine. The load carrying member includes an outer shell, an inner shell disposed within the outer shell. The inner shell is pre-stressed. The load carrying member also includes a polymer composite disposed between an outer surface of the inner shell and an inner surface of the outer shell.

What is claimed is: 
     
         1 . A load carrying member for a machine, the load carrying member comprising:
 an outer shell;   an inner shell disposed within the outer shell, wherein the inner shell is pre-stressed; and   a polymer composite disposed between an outer surface of the inner shell and an inner surface of the outer shell.   
     
     
         2 . The load carrying member of  claim 1 , wherein a cross-section of the outer shell comprises one of a rectangle, polygon, a circle, and an ellipse. 
     
     
         3 . The load carrying member of  claim 1 , wherein a cross-section of the inner shell comprises one of a rectangle, polygon, a circle, and an ellipse. 
     
     
         4 . The load carrying member of  claim 1 , wherein the outer shell comprises a first end and a second end, each of the first end and the second end comprising an attachment fixture configured to couple the outer shell to a frame and a stick of the machine, respectively. 
     
     
         5 . The load carrying member of  claim 1 , wherein the inner shell is bent at a predetermined curvature. 
     
     
         6 . The load carrying member of  claim 1 , wherein material of the outer shell comprises at least one of High Speed Steel (HSS) and carbon fibers. 
     
     
         7 . A machine comprising:
 a frame; and   a boom assembly coupled to the frame, the boom assembly comprising:
 a work tool; 
 a stick coupled to the work tool; and 
 a load carrying member having a first end coupled to the frame and a second end coupled to the stick, the load carrying member comprising:
 an outer shell; 
 an inner shell disposed within the outer shell, 
 
 wherein the inner shell is pre-stressed; and
 a polymer composite disposed between an outer surface of the inner shell and an inner surface of the outer shell. 
 
   
     
     
         8 . The machine of  claim 7 , wherein each of the first end and the second end of the load carrying member comprising an attachment fixture configured to couple the outer shell to the frame and the stick, respectively. 
     
     
         9 . A boom assembly of a hydraulic excavator machine, the boom assembly comprising:
 a work tool;   a stick coupled to the work tool; and   a load carrying member having a first end coupled to a frame of the machine and a second end coupled to the stick, the load carrying member comprising:
 an outer shell; 
 an inner shell disposed within the outer shell, wherein the inner shell is pre-stressed; and 
 a polymer composite disposed between an outer surface of the inner shell and an inner surface of the outer shell. 
   
     
     
         10 . The boom assembly of  claim 9 , wherein a cross-section of the outer shell comprises one of a rectangle, polygon, a circle, and an ellipse. 
     
     
         11 . The boom assembly of  claim 9 , wherein a cross-section of the inner shell comprises one of a rectangle, polygon, a circle, and an ellipse. 
     
     
         12 . The boom assembly of  claim 9 , wherein each of the first end and the second end comprising an attachment fixture configured to couple the load carrying member to the frame and the stick, respectively. 
     
     
         13 . The boom assembly of  claim 9 , wherein the inner shell is bent at a predetermined curvature. 
     
     
         14 . The boom assembly of  claim 9 , wherein material of the outer shell comprises at least one of High Speed Steel (HSS) and carbon fibers.