Patent ID: 7172105

Claim:
A counterweight apparatus especially adapted for use in combination with a spinner tool, with respect to which a rotatable workpiece to be welded is longitudinally co-axially mounted, for balancing an off-axis portion of said rotatable workpiece, said assembly comprising: a) a frame member removably securable to said spinner tool; b) a counterweight positioning assembly slidably engaged by said frame member permitting said counterweight assembly to be moved transversely with respect to a common longitudinal axis of said spinner tool and workpiece; c) a releasable locking member incorporated on said frame member for permitting the position of the counterweight to be transversely adjusted with respect to the frame, to counterbalance the weight of said off-axis portion of said workpiece; d) said counterweight positioning assembly including a pair of substantially parallel, spaced and connected counterweight members that are received in said frame and slidable for said transverse adjustment therein; e) said frame includes a releasable locking member permitting angular adjustment of the orientation of said frame with respect to said workpiece so that said counterweight members are generally parallel to the axis of said off-axis portion of said rotatable workpiece.