Drive mechanism for oscillatory abrasion and polishing tool

A polishing tool having a transmission for changing rotary motion into angularly reciprocating motion and adapted to be mounted on the output end of a power unit of the type having a rotary drive output and used to drive the body polishing tool, said transmission comprising:

• (a) a support member (42);
• (b) a driving member (30) in a first plane oriented in a first direction supported by said support member (42) for rotary motion;
• (c) a driven member (40) made of a resinous material and supported by said support member (42) for reciprocating angular movement by said support member (42) in a second plane, said second plane being transverse to said first plane, said driving member (30), said driven resinous member (40) and said support member (42) forming a transmission subassembly adapted to be mounted on the output end of said power unit with said rotary drive output mechanically coupled to said driving member (30);
• (d) a driving cam surface (50) disposed on a portion of said driving member (30), said driving cam surface (50) having a first shape;
• (e) a driven cam surface (60) disposed on a portion of said driven resinous member (40), said driven cam surface (60) having a second shape, said driven resinous member (40) being supported with respect said driving member (30) in a position where said driving cam surface (50) is in contact with said driven cam surface (60) during at least a portion of the cycle of rotation of said driving cam surface (50), said second shape configured and dimensioned to be driven by said driving cam surface (50) in a positive angular direction during one part of said cycle and be driven by said driving cam surface (50) in a negative angular direction during another part of said cycle wherein said driven cam surface (60) comprises a shaft mounted onto a support, wherein the support is coupled to a coupling element having a pad attached to the surface of the coupling element wherein the coupling element is a disposable head having a polishing disc with an abrasive surface.

A sanding tool for sanding surfaces having a transmission for changing rotary motion into angularly reciprocating motion and adapted to be mounted on the output end of a power unit of the type having a rotary drive output and used to drive the sanding tool, said transmission comprising:

• (a) a support member (42);
• (b) a driving member (30) in a first plane oriented in a first direction supported by said support member (42) for rotary motion;
• (c) a driven member (40) made of a resinous material and supported by said support member (42) for reciprocating angular movement by said support member (42) in a second plane, said second plane being transverse to said first plane, said driving member (30), said driven resinous member (40) and said support member (42) forming a transmission subassembly adapted to be mounted on the output end of said power unit with said rotary drive output mechanically coupled to said driving member (30);
• (d) a driving cam surface (50) disposed on a portion of said driving member (30), said driving cam surface (50) having a first shape;
• (e) a driven cam surface (60) disposed on a portion of said driven resinous member (40), said driven cam surface (60) having a second shape, said driven resinous member (40) being supported with respect said driving member (30) in a position where said driving cam surface (50) is in contact with said driven cam surface (60) during at least a portion of the cycle of rotation of said driving cam surface (50), said second shape configured and dimensioned to be driven by said driving cam surface (50) in a positive angular direction during one part of said cycle and be driven by said driving cam surface (50) in a negative angular direction during another part of said cycle wherein said driven cam surface (60) comprises a shaft mounted onto a prophy angle support, wherein the prophy angle support is coupled to a coupling element having a pad attached to the surface of the coupling element wherein the coupling element is a disposable head having a sanding disc with an abrasive surface suitable for sanding.

A transmission for changing rotary motion into angularly reciprocating motion and adapted to be mounted on the output end of a power unit of the type having a rotary drive output and used to drive a 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 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.