Dental handpiece having an automatically controlled turbine driv

Details Dental handpiece having an automatically controlled turbine driv Dental handpiece having an automatically controlled turbine driv

1994-06-14

1996-03-05

Lucchesi, Nicholas D.

Dentistry

Apparatus

Having motor or means to transmit motion from motor to tool

415904, A61C 105

Patent

active

054961734

ABSTRACT:
A controllable turbine drive for a dental handpiece has an adjustment member which rotates with the rotor disc and is deformable due to the centrifugal forces to constrict an exhaust channel extending along the disc to change the effective cross section of the channel so that with an increased speed of rotation, the effective cross section decreases and with a decreased speed, the effective cross section is increased. The member may be an elastic ring which is restrained by a rim formed by a recess on one side of the rotor disc or it may be an elastic spring washer, which has an upturned peripheral flange and which is bent or elastically deformed.

REFERENCES:
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patent: 3132426 (1964-05-01), White
patent: 3386702 (1968-06-01), Krzyszczuk
patent: 3578872 (1971-05-01), McBurnie
patent: 3708240 (1973-01-01), Theis, Jr. et al.
patent: 3733143 (1973-05-01), Theis, Jr.
patent: 3767320 (1973-10-01), Theis, Jr. et al.
patent: 3865505 (1975-02-01), Flatland
patent: 4060336 (1977-11-01), Theis, Jr. et al.
patent: 4341520 (1982-07-01), Wallace
patent: 4723911 (1988-02-01), Kurtz
patent: 4744752 (1988-05-01), Nakayama et al.
patent: 5364227 (1994-11-01), Franetzki et al.

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