Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1979-01-15
1980-05-20
Mancene, Louis G.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
279 4, 279 75, A61C 110
Patent
active
042032229
ABSTRACT:
A surgical tool has a pneumatically driven rotor motor, a source of air under pressure to drive the motor, an output system for receiving rotation from the motor and transmitting it to a bur and a securing system for securing the bur to the output system. The securing system receives air pressure from the source of air and converts the pressure to a force acting on the bur to grip the bur. The motor has a shaft mounted for rotation in a housing, and the shaft is hollow so that some of the air directed into the motor goes through the shaft and into a chamber. A piston is mounted in the housing, and when air from the shaft is directed into the chamber, it moves the piston in the chamber. The piston is connected to a collet, so that introduction of air into the chamber moves the collet. The collet has an inclined surface, and there are grippers between the inclined surface and the bur. As the collet moves so that the narrower portion of the inclined surface contacts the grippers, the grippers are urged against the bur to secure it. The piston is connected to the collet by a connection allowing relative movement therebetween so that when the piston moves to its release position while static friction from the grippers holds the collet means against the grippers, the piston can move toward a releasing position to provide a jerk on the collet to overcome static friction and move the collet to a releasing position.
REFERENCES:
patent: 3692321 (1972-09-01), Shattuck
patent: 3698729 (1972-10-01), Scherfen
patent: 3712386 (1973-01-01), Peters
patent: 3724563 (1973-04-01), Wickham et al.
patent: 3775851 (1973-12-01), Flatland
patent: 4033039 (1977-07-01), Lohn et al.
American Safety Equipment Corporation
Mancene Louis G.
Wilson John J.
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