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US 4,060,978 AGranted
Drag chain
AssigneeColumbia Steel Casting Co., Inc.
InventorsRobert T. McBain, Bruce C. Johnson
Life of this patent
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AssigneeColumbia Steel Casting Co., Inc.
InventorsRobert T. McBain, Bruce C. Johnson
Estimating the term…
A chain particularly useful for draglines in various type strip mining operations is disclosed. The chain is made up of individual, separately assembled links of generally a U-shape having spaced pin lugs at one end. The lugs have aligned pin eyes for holding a pin between them, which is received generally flush with the outside surfaces of the lugs. To prevent pin rotation and to prevent oblong wear in the pin eyes, the pin and the eyes have a flat surface on the side toward the open end of the U-shaped link. With the pin installed in the eyes, a keeper is welded onto the flat surface of the pin, extending between the two lugs to retain the pin in place. The units are assembled at 90.degree. to one another, with a pin of one link passing through the next link. The body of the link may be of a more wear-resistant material than the pin so that the easily replaceable pin wears out first.
A chain including a plurality of serially connected links, each link comprising a yoke shaped body having a juncture at one end defining an open area, a pair of spaced apart lugs at the other end forming an open end, each lug having a pin eye, the pin eyes being aligned with one another and each including a flat surface oriented toward said other end of the link, and a link pin shaped complementarily to the pin eyes, with a flat surface from end to end on one side and of a length to extend into both pin eyes, with a pin keeper affixed to the flat surface of the pin between the lugs when the pin is assembled in the eyes to prevent escape of the pin, said main links being interconnected with the pin of each link passing through said juncture end open area of the next succeeding link.
A dragline chain, including a pair of opposite end links and a plurality of serially connected main links between the end links, each link comprising a yoke shaped body having a juncture at one end defining an open area, a pair of spaced apart lugs at the other end, each having a pin eye, the pin eyes being aligned with one another and each including a flat surface oriented toward said other end of the link, and a link pin shaped complementarily to the pin eyes, with a flat surface from end to end on one side and of a length to extend between the pin eyes without projecting beyond the outside boundary of either pin eye, with a pin keeper affixed to the flat surface of the pin between the lugs when the pin is assembled in the eyes to prevent escape of the pin, said main links being interconnected with the pin of each link passing through said juncture end opening of the next succeeding link.
A dragline chain including a pair of opposite end links and a plurality of serially connected main links between the end links, each link comprising a yoke shaped body having a juncture at one end defining an open area, a pair of spaced apart lugs at the other end, a brace extending between the two sides of the yoke shaped body between said juncture end and the other end, boss areas on the outside surfaces of both sides of the yoke shaped body, each extending from adjacent a pin eye along the side of the body toward the juncture end, each lug having a pin eye, the pin eyes being aligned with one another and each including a flat surface oriented toward said other end of the link, and a link pin shaped complementarily to the pin eyes, with a flat surface from end to end on one side and of a length to extend between the pin eyes without projecting beyond the outside boundary of either pin eye, with a pin keeper affixed to the flat surface of the pin between the lugs when the pin is assembled in the eyes to prevent escape of the pin, said pin and link body being of dissimilar metals having different coefficients of friction main links being interconnected with the pin of each link passing through said juncture end opening of the next succeeding link.
Dependencies are inferred from the claim text.