Abstract: The present invention enables the efficient production of integral baseball bats made of metal tubing by use of a unique process utilizing a forming machine without welding or joining individually processed portions, this process comprising substantially the following major steps:The step of rotationally forming the body portion by pressing a plurality of spinning rollers of three or more in number synchronously on the tubing with a pre-formed mandrel inserted therein;The step of rotationally forming the grip portion by urging another plurality of rollers against the tubing at the rear portion thereof after retracting the tailstock; andThe step of rotationally forming the other end portion of the tubing which is re-chucked after an interruption of working followed by a turn-over of the tubing which has been removed from the mandrel.

Abstract: A process for forming metal pipes to a desired shape comprising fitting a metal pipe onto a model having same profile as the one desired to form, fixing the pipe thereon, arranging a plurality of metal rollers at same distance and around the metal pipe in such a manner that these rollers are in contact with the pipe always keeping their centers on the circumference of a concentric circle irrespective of the change in their position during their forward and backward movement relative to the longitudinal center axis of the model and rotating the metal pipe integral with the model in the longitudinal direction while forcing the rollers to move forwards and backwards.

Abstract: The invention concerns a device to be applied to a lathe for spinning, comprising a carriage that is motor driven and movable along guides substantially parallel to the lathe axis, and a tool connected to an arm carried by the said carriage, in which the said tool-bearing arm is pivotally connected on one side to a lever that is manipulated by the operator, and on the other side is linked to a hydraulic cylinder, whose action on the tool is concordant with that of the lever and in which the pressure within a chamber and the outlet of fluid therefrom determine the thrust exerted by the said cylinder on the tool-bearing arm, said lever transmitting the operator effort to the said arm through the sliding piston of a valve which, under said effort, progressively throttles, against the pressure of the incoming fluid, an inlet port coaxial with said piston and communicating with said chamber of said hydraulic cylinder in order to regulate the pressure in said chamber and the outlet of fluid therefrom.