Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1990-05-25
1991-08-20
Weiss, John G.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 114
Patent
active
050409808
ABSTRACT:
A dental handpiece having a bur-receiving chuck with spring jaws which exert a strong clamping force on the shank of a bur for operatively securing the bur to the handpiece rotor, such handpiece also having a lever-actuated bur release mechanism for forcing the jaws apart when removal and replacement of a bur is desired. A force-multiplying control lever for camming open the clamping jaws is an integrated part of the handpiece assembly and is carried by a removable disk-shaped cover that may be rotated with respect to the head of the handpiece to position the lever at whatever radial direction the user prefers. A helical cup spring frictionally engages the cover to maintain the lever in its selected direction of operation, and at least one annular leaf spring bears against a cam portion of the control lever to hold the lever in a retracted or lowered position during operation of the handpiece.
REFERENCES:
patent: 4089115 (1978-05-01), Heil et al.
patent: 4370132 (1983-01-01), Wohlgemuth
patent: 4493645 (1985-01-01), Nakanishi
patent: 4536157 (1985-08-01), Maizenberg
patent: 4575338 (1986-03-01), Maizenberg
patent: 4874314 (1989-10-01), Fleer et al.
Lynch Michael
Midwest Dental Products Corporation
Weiss John G.
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