Heavy-duty shackle

Abstract

A heavy-duty shackle has a shackle body with two opposing end sections, each of which having a through-opening for receiving a bolt, which has a threaded section for a locknut at one end and a head at the other end, the head outer edge being non-circular. The through-openings are each surrounded by at least one nut bearing face, which is raised relative to a bearing face, directly surrounding the through-openings, for the head. An anti-rotation means for the bolt is formed in each case by a recessed head receptacle in the nut bearing face, the head outer edge being accommodated fully in the recess and being interlockingly held in place therein.

What is claimed is: 
     
         1 . A heavy-duty shackle, comprising:
 a shackle body having two opposite end sections each with a through-opening and the shackle body having a central arc extending between the end sections, wherein the through-openings of the end sections are aligned;   a bolt inserted in the through-openings and having a threaded portion with a lock nut at one end and a head at the other end, wherein a circumferential edge of the head of the bolt is non-circular;   wherein the through-openings are each directly surrounded by at least one recessed head receptacle that forms an anti-rotation lock, wherein the recessed head receptacle is recessed within a nut support surface that is arranged on an outside of each of the end sections, and wherein the non-circular circumferential edge of the head of the bolt is positively fixed in the recessed head receptacle, and   wherein a bottom surface of the lock nut, which faces the head of the bolt, directly contacts and is supported by the nut support surface which surrounds the recessed head receptacle.   
     
     
         2 . The heavy-duty shackle of  claim 1 , wherein the circumferential edge of the head of the bolt has a straight secant portion and a circular arc portion, wherein the circular arc portion connects to ends of the straight secant portion. 
     
     
         3 . The heavy-duty shackle of  claim 2 , wherein an outer contour of the circumferential edge of the head and an inner contour of the recessed head receptacle are identical and offset from one another by a gap width. 
     
     
         4 . The heavy-duty shackle of  claim 3 , wherein the nut support surface is smooth and is part of an outer surface of each respective one of the end sections. 
     
     
         5 . The heavy-duty shackle of  claim 4 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections. 
     
     
         6 . The heavy-duty shackle of  claim 2 , wherein the nut support surface is smooth and is part of an outer surface of each respective one of the end sections. 
     
     
         7 . The heavy-duty shackle of  claim 6 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections. 
     
     
         8 . The heavy-duty shackle of  claim 2 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections. 
     
     
         9 . The heavy-duty shackle of  claim 1 , wherein an outer contour of the circumferential edge of the head and an inner contour of the recessed head receptacle are identical and offset from one another by a gap width. 
     
     
         10 . The heavy-duty shackle of  claim 9 , wherein the nut support surface is smooth and is part of an outer surface of each respective one of the end sections. 
     
     
         11 . The heavy-duty shackle of  claim 10 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections. 
     
     
         12 . The heavy-duty shackle of  claim 1 , wherein the nut support surface is smooth and is part of an outer surface of each respective one of the end sections. 
     
     
         13 . The heavy-duty shackle of  claim 12 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections. 
     
     
         14 . The heavy-duty shackle of  claim 1 , wherein the nut support surface is formed on a web or hump which is raised relative to the outer surface of each respective one of the end sections.