Russell V Robison

US Patent:

39711323, Jul 27, 1976

Filed:

Oct 7, 1974

Appl. No.:

5/512789

Inventors:

David R. Griffies - Joppa MD
Russell O. Robison - Plymouth OH
Robert W. Taylor - Jackson TN

Assignee:

Rockwell International Corporation - Pittsburgh PA

International Classification:

B27B 1909

US Classification:

30393

Abstract:

A portable, power-operated sabre saw having a power driven saw blade holder which is curved and which is mounted in the sabre saw housing for reciprocation along a curved path that is determined by its curvature to impart to a blade carried thereby a component of cutting stroke travel that is in the direction in which the blade is urged against a workpiece to cut the workpiece. Another feature disclosed herein is a counterweight which dynamically counterbalances the mass of the saw blade holder and the saw blade and which is recessed to receive a power driven gear that supplies the motion for reciprocating the holder and the counterweight. The counterweight is confined between and guided for reciprocating motion by opposed side wall regions of a longitudinally split housing, and a guide pin, which is trapped between the halves of the split housing, extends through a slot in one end of the counterweight to provide a further guide for the counterweight. Also disclosed herein is two-part bearing holder assembly in which a locating protuberance is formed on one part to transversely locate the second part, but which permits relative axial displacement of the second part to enable the second part to be axially positioned by engagement with a spherically contoured surface of a bearing that is clamped between the two bearing holder parts. The second part mounts a gear supporting idler shaft to ensure that the axis of the idler shaft is parallel with the axis of the bearing seat on the second part.