Patent ID: 7670535

Claim:
A process for the production of a casing ( 1 ) with protective bellows ( 2 , 2 A) for a transmission device, such as a transmission joint, comprising at least two shafts movable at least one of axially and angularly relative to each other, this casing ( 1 ) with bellows ( 2 , 2 A), of which at least a portion of the bellows ( 2 ) is radial, having at each open end a section ( 3 A, 3 B) for securement to the transmission device, the method comprising: injecting a thermoplastic or thermoplastic elastomer into a hollow mold ( 5 ) formed by two half shells or a greater number of elements adapted to be brought together to delimit a closed cavity and at least one core ( 4 ), each mold ( 5 ) having at least one complementary helicoidal screw thread delimiting the molding space, and in demolding the formed casing ( 1 ) by relative unscrewing of the casing ( 1 ) after opening the hollow mold and the core ( 4 ) so as to obtain a single-piece casing, wherein the largest cross-section of the core or cores ( 4 ) is arranged have a diameter less than or equal to the passage section of the securement section ( 3 A) of largest dimension of the casing ( 1 ) with bellows ( 2 , 2 A), and the core or cores ( 4 ) and the body of the mold ( 5 ) have a truncated conical shape.