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US 4,403,639 AGranted
Stud arrangement on chains for motor vehicles, and a method of producing such chains
OwnerBjarne Holteinventor
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OwnerBjarne Holteinventor
Estimating the term…
A stud arrangement on casehardened studded chains for motor vehicles, wherein the studs consist of a steel body which is permanently welded to a chain link and provided with a centrally disposed hard metal pin. The hard metal pin is inserted into the steel body such that it is covered on all sides by steel material of a thickness which at least corresponds to the casehardening penetration depth. In a method for producing such studded chains, an inwardly converging blind hole is cut out from one end of the steel body. The hard metal pin, of a shape corresponding to the conical hole, is forced into the hole, the pin being shorter than the blind hole so that a skirt is formed outside the pin. The edge of the skirt is beveled, and the steel body with the metal pin therein is joined to the chain by resistance welding in a machine for welding studs onto chain links, the body with the pin being moved gradually toward the chain link as the beveled edge melts and flows radially outwards. The studded chain is then case hardened.
A casehardened studded chain for motor vehicles comprising a plurality of casehardened chain links each of which has at least one stud extending outwardly therefrom, each of said studs consisting of a steel body which is permanently welded to a casehardened chain link and provided with a centrally disposed hard metal pin, the hard metal pin being located within the steel body such that the sides of said pin projecting away from said chain link and the end of said pin remote from said chain link are covered by steel material of said body, the covering portions of said steel material having a thickness which is at least equal to the casehardening penetration depth of said casehardened chain link.
A method of producing studded chains of the type comprising a plurality of casehardened chain links each of which has at least one stud extending outwardly therefrom and wherein each of the studs consists of a steel body which is permanently welded to a chain link and is provided with a centrally disposed hard metal pin, said method comprising the steps of cutting an inwardly converging blind hole into one end of the steel body, forcing into said blind hole a hard metal pin of a shape corresponding to the conical hole, the pin being shorter than the blind hole so that a skirt is formed adjacent the open end of said hole, beveling the edges of the skirt, joining the steel body with the hard metal pin therein to the chain link at the beveled end of said body by resistance welding in a machine for welding studs onto chain links, the bodyd with the pin therein gradually being moved toward the chain link as the beveled end melts and flows radially outwards, and thereafter casehardening the chain link with the stud joined thereto, the portions of said steel body which cover said hard metal pin being operative to protect said pin from damage during said casehardening step and having a thickness which is at least equal to the casehardening penetration depth of said casehardened chain link.
Dependencies are inferred from the claim text.