Patent ID: 6247931
Filing Date: 2001-06-19
Classification: A61C,Y10T

Abstract:
A transmission for changing rotary motion into angularly reciprocating motion and adapted to be mounted on the output end of a dental power unit of the type having a rotary drive output and used to drive a dental tool, said transmission comprising:(a) a support member;(b) a driving member made of a resinous material and supported by said support member for rotary motion;(c) a driven member made of a resinous material and supported by said support member for reciprocating angular movement by said support member, said driving resinous member, said driven resinous member and said support member forming a transmission subassembly adapted to be mounted on the output end of said dental power unit with said rotary drive output mechanically coupled to said driving resinous member;(d) a driving cam surface disposed on a portion of said driving resinous member, said driving cam surface having a first shape;(e) a driven cam surface disposed on a portion of said driven resinous member, said driven cam surface having a second shape, said driven resinous member being supported with respect said driving resinous member in a position where said driving cam surface is in contact with said driven cam surface during at least a portion of the cycle of rotation of said driving cam surface, said second shape configured and dimensioned to be driven by said driving cam surface in a positive angular direction during one part of said cycle and is driven by said driving cam surface in a negative angular direction during another part of said cycle.