Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Reexamination Certificate
2005-11-01
2010-10-19
Rodriguez, Cris L (Department: 3732)
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
Reexamination Certificate
active
07815433
ABSTRACT:
The invention relates to an improved dental tool drive arrangement for a handpiece with a drive head, the tool drive arrangement permitting length adjustment of the tool in the drive head by concentrically supporting the tool in the drive head at any position from a fully inserted position to a maximum retracted position. The tool drive arrangement preferably includes a tool and a rotatable tool supporting element for concentrically supporting the tool from the fully inserted to the maximum retracted position, the tool preferably including a maximum retraction indicator for indicating to a user when the tool has been retracted to the maximum retraction position. This provides a significant advantage over the prior art by allowing a user to adjust the exposed length of a rotatable tool, preferably a dental bur, without exceeding safe operating limits. The invention also relates to an improved drive spindle which allows depth adjustment of a tool in a dental handpiece while maintaining efficient torque transfer and concentricity during high speed rotation.
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separate. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved May 29, 2009, from Dictionary.com website: http://dictionary.classic.reference.com/browse/separate.
Bailey Kevin John
Castonguay Jean
Millson Andrew Douglas
Turner Derek M. J.
Clark Hill PLC
Eide Heidi M
Rodriguez Cris L
TTI Turner Technology Instruments Inc.
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