Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1981-01-19
1982-07-27
Peshock, Robert
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 105
Patent
active
043415202
ABSTRACT:
A dental handpiece is disclosed for rotating a bur in a housing having an enclosing cap, utilizing an air-driven, axial-flow turbine mounted on a shaft between two ball bearings, the assembly forming a removeable cartridge. Air is directed to the turbine through a combination plenum and nozzle ring. The cartridge is acoustically isolated from the cap and housing by two elastomeric rings having separate radial segments and axial pads. The radial segments support the cartridge bearings, prevent outer race rotation, compensate for dimensional variation of the elastomeric rings and cap and housing bores, and provide a means to vary suspension stiffness. The axial pads of the elastomeric ring around the front bearing provide a bearing pre-load force independent of the radial forces exerted on the bearing. The axial pads of the elastomeric ring around the rear bearing prevent air leakage from the plenum, seat the nozzle ring securely in the housing, and compensate for dimensional variation of the nozzle ring, housing, and cap, independent of the radial forces on the bearing.
REFERENCES:
patent: 3218028 (1965-11-01), Borden
Kuypers Rene A.
Peshock Robert
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