Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Reexamination Certificate
2011-04-19
2011-04-19
Rodriguez, Cris L (Department: 3732)
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
C415S904000
Reexamination Certificate
active
07927101
ABSTRACT:
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 handpiece10has a gripping portion11to be gripped by an operator, a head15mounted at a distal end of the gripping portion; and a wheel55rotatably mounted in an interior of the head. The head has an inlet25from which air is supplied to the wheel and an outlet28from which the air is discharged, the inlet and outlet being defined in the head, at least one buffer chamber47defined 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, passages66, 67, 68, and34for guiding the accumulated air from a neighborhood of the rotating wheel to an atmosphere, and a circumferential wall44mounted between the outlet and the wheel for providing a resistance to the air moving from the wheel toward the outlet.
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Nakayama Shozo
Takashi Tetsuya
DLA Piper (LLP) US
J. Morita Manufacturing Corporation
Rodriguez Cris L
Rosen Eric
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