(under subclass 386) Device wherein the path of motion of said movable tool is a straight line, and the respective work-engaging surface portions (i.e., tool-faces*) of the
elements are of substantially annular shape and are radially offset about a common axis aligned with said path of motion.
(1) Note. A typical device of this subclass is an upsetter for hollow rivets, comprising a headed pulling tool surrounded by a tubular sleeve; a hollow rivet engaged by the head is upset against an annular anvil surface on the end of the sleeve.
(2) Note. The subject matter of this subclass differs from somewhat similar subject matter in subclass 392, in that the co-acting tool-faces in this subclass (391.2) are radially offset, i.e., they move in noninterfering paths, while the stretching tool-faces of subclass 392 move (in opposite directions) along the same path. (see appended diagram): (A) Work engaged by radially offset tool-faces (subclasses 391.2+); (B) Work engaged by receding, in-line, tool-faces (subclass 392). [figure]
SEE OR SEARCH THIS CLASS, SUBCLASS:
274+, for metal-deforming apparatus comprising a gripper capable of pulling elongated work through a die orifice.
347+, for deep drawing apparatus comprising radially offset concentric tool faces.
