Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1980-07-16
1982-10-12
Peshock, Robert
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 108
Patent
active
043536972
ABSTRACT:
An air-powered dental handpiece and a connecting means comprises a handle portion and a powerhead assembly. A sleeve bearing having a forwardly reducing cylindrical internal surface is integrally held into another end opening of the handle portion. The surface has three stepped annular space walls, and a central air supply passage and two axial passages for exhaust and water are provided to extend to the stepped annular space walls. An air supply pipe is fixedly inserted into the central passage and two pipes are fixedly inserted into two passages. A front portion of a connecting means is so formed into a forwardly reducing cylindrical plug as to fit into a socket of the sleeve bearing. The plug is provided with a top flat wall and two stepped annular space walls to form a neck journal, which is journaled in the sleeve bearing, thus bringing the top flat wall of the plug in close proximity to the innermost stepped wall of the sleeve bearing and two stepped annular walls of the plug in close proximity to the two stepped annular walls of the bearing respectively and communicating the passages of the plug with those of the bearing. A push-pull rod having a head at its outer end and a right angle hook at its inner end is put into a cylindrical casing of the plug by a dead spring, thus enabling a dentist to easily remove or reinsert a handle portion from or into the connecting means and also assuring smooth operation.
REFERENCES:
patent: 3936940 (1976-02-01), Loge
patent: 4217101 (1980-08-01), Loge
Nakanishi Dental Manufacturing Co.
Peshock Robert
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