Dental handpiece and a cartridge for a head thereof

Details Dental handpiece and a cartridge for a head thereof Dental handpiece and a cartridge for a head thereof

1975-02-20

1977-05-10

Peshock, Robert

A61C 112

Patent

active

040219178

ABSTRACT:
A dental handpiece of the present invention is provided with a head extending at substantially a right angle to said handpiece having a hollow therein. The head is also provided with a hollow vertically communicating with the hollow of the handpiece. A semispherical groove is cut into the hollow wall longitudinally and partially adjacent an orifice of the head. A cartridge having an elongated opening cut through at a mid-portion of a bottom thereof and also a small opening at a top wall near a lower orifice and at the same position as the semispherical groove is mounted into its hollow with a rotatable bushing through metal bearings inserted into a lower and upper orifices of the hollow. A gear is secured to the bushing at a position to form an entry into the elongated opening of the cartridge. Together with the spherical groove of the head and the small opening of the cartridge, a semispherical cavity cut into the lower metal bearing defines a spherical space for a metal ball. Accordingly, when the cartridge having a reamer is inserted into the head, the metal ball is fitted in a protruding fashion into the semispherical groove to prevent idling between the gear and metal bearings. The gear secured to the bushing can be easily adapted to mesh with a gear of the driving gear rotatably mounted within the handpiece, thus enabling the dentist to easily exchange the cartridge comprising the worn out parts.

REFERENCES:
patent: 1853089 (1932-04-01), Skinner
patent: 3408043 (1968-10-01), Williams

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