J. Morita Manufacturing Corporation

Kabushiki Kaisha Morita Seisakusho

Tetsuya Takashi

Shozo Nakayama

An air-driven rotary cutting tool including a grip part, a head part provided at a distal end of the grip portion, and a rotor of double-wheel type rotatably installed in a hollow portion formed in the head part. The rotor has a first turbine blade portion provided with a plurality of first turbine vanes surrounding the rotary axis and a second turbine blade portion integrally formed with the first turbine blade and having a plurality of second turbine vanes surrounding the rotary axis. The first turbine vane has, on its side when seen in a direction into the rotary axis, a concave shape concaved in a direction of rotation of the rotor, and the second turbine vane has, on its side, a concave shape concaving in a direction opposite from the first turbine vane.

Air-driven rotary cutting tool

Dental handpiece

A handpiece and a method for driving the handpiece are provided in which a sucking-back problem can be prevented with a simple structure. The handpiecehas a gripping portionto be gripped by an operator, a headmounted at a distal end of the gripping portion; and a wheelrotatably mounted in an interior of the head. The head has an inletfrom which air is supplied to the wheel and an outletfrom which the air is discharged, the inlet and outlet being defined in the head, at least one buffer chamberdefined in the head, where the air is forced in due to a centrifugal force applied thereto by rotations thereof with the wheel and then accumulated under positive pressure, passages, andfor guiding the accumulated air from a neighborhood of the rotating wheel to an atmosphere, and a circumferential wallmounted between the outlet and the wheel for providing a resistance to the air moving from the wheel toward the outlet.

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Kyoto, Japan

Tetsuya Takashi