Dental Handpiece Reduction Gear

Dental handpiece reduction gear

Dental handpiece reduction gear

A modular reduction gear for a dental handpiece comprises an input shaft coupled to the driving motor and provided with a pinion constituting the sun wheel of an epicyclic gear of which the planet carrier is rigid with the adjacent end of the output shaft transmitting the rotary motion to the dental instrument, the carrier supporting three planet pins having mounted thereon for free rotary motion three planet pinions meshing with the sun pinion and with a fixed toothed annulus clamped between the pair of sockets constituting the body of the dental high speed handpiece.

This dental equipment relates to a reduction gear for dental hand tool holders or handpieces, of the type comprising an input shaft driven from the motor and an output shaft for transmitting the rotary motion to an instrument, in particular to a burr, both input and output shafts being mounted in mutual alignment within the body of the handpiece consisting of two sockets secured to each other.

Reduction gears are widely used in the field of dental handpieces whenever it is desired to increase the torque available at the instrument.

Thus for instance, a gear type reducer is known wherein the two registering ends of the two sections of the rotary longitudinal shaft carry respectively two pinions of different diameters which mesh respectively with a pair of pinions rigid with a transverse lay shaft having its axis perpendicular to the axis of the longitudinal shaft. To reduce the overall dimensions of the mechanism, one of the pinions rigid with one section of the longitudinal shaft is bell-shaped so that the larger toothed pinion rigid with the lay shaft can fit partially therein.

It is the primary object of the present curing light to provide a modular reduction gear constituting a substantial improvement over the prior art in that its overall dimensions are reduced considerably while affording a very regular rotational movement.

For this purpose, the reduction gear according to this dental autoclave

is characterized in that the driving end of the input shaft is provided with a toothed sun pinion and that the driven end of the output shaft comprises a head supporting three planet pins parallel to the axis of the toothed pinion, said three planet pins being disposed at the vertices of an equilateral triangle and each having mounted thereon for free rotary motion a planet pinion, the three dental handpieces pinions meshing on the one hand with said central sun pinion which they surround and on the other hand, externally, with a fixed and internally toothed annulus surrounding in turn said planet pinions and secured between the two sockets constituting the body of said holder.

by: wan

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