Improved tool clamping device

• Main Authors: WILLIAM H. AULTMAN, ROBERT A. GROGAN
• Format: Patent
• Language: English
• Published: 16.08.1999
• Edition: 6
• Subjects: BLASTING; DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS ORMACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS,CLIPS, WEDGES, JOINTS OR JOINTING; DRESSING OR CONDITIONING OF ABRADING SURFACES; ENGINEERING ELEMENTS AND UNITS; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GRINDING; HEATING; LIGHTING; MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; POLISHING; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS

A clamping device for holding a rotating tool or stationary object to a threaded shaft of a power tool or machine includes a body member having an annular ring configured therewith. The annular ring has at least two concentric ramped bearing surfaces defined on an inner axial face thereof. An operating ring is rotationally mounted on the body member and has an axial face with concentric ramped bearing surfaces defined thereon oppositely facing the bearing surfaces on the annular ring. The operating ring has a second axial face with at least one unramped bearing surface defined thereon. A flange member has an inner axial face opposite the operating ring second axial face. The flange member is axially movable relative to the body member and presses against and clampingly holds a rotating tool relative to a drive shaft upon manual rotation of the operating ring in a tightening direction. A bearing device is disposed between the ramped bearing surfaces of the annular ring and the operating ring. Upon rotation of the operating ring in the tightening direction, high sections of the ramped bearing surfaces approach each other causing the flange member to move axially outward to clamp against a tool to be held to a drive shaft.