TTI Turner Technology Instruments Inc. Patent applications |
Patent application number | Title | Published |
20110171595 | DENTAL BUR - The invention relates to an improved bur for use in handpieces having a rotatable chuck with a tool bore for receiving the bur, a friction grip member for frictionally retaining the bur in the chuck and a torque lock seat of non-circular cross-section and permitting length adjustment of the bur in the drive head by concentrically supporting the bur in the drive head at any position from a fully inserted position to a maximum retracted position. The bur includes a tool body having an axis of rotation, a working end for projecting from the handpiece and a driven end for insertion into the tool bore of the chuck. The driven end is a generally cylindrical shaft with a preselected outer circumference for fittingly engaging in the tool bore for concentric rotation of the driven end with the chuck. The shaft including a torque lock portion for fittingly and non-rotatably engaging the torque lock seat of the chuck. The torque lock portion has at least two flat surfaces circumferentially spaced apart by intermediate cylindrical mantle portions, for providing the locking portion with a cross-section including alternating circular and straight sections and fitting into the non-circular cross-section of the torque lock seat to prevent rotation of the torque lock portion in the torque lock seat. The circular sections have the same diameter as the outer diameter of the cylindrical shaft. A total area of the flat surfaces covers at least 0.001956 square inches and the circular sections extend over at least 30% of the outer circumference of the driven end. This maintains efficient torque transfer between the chuck and the tool and ensures concentricity of the bur in the handpiece to prevent undue vibration of the bur in the handpiece. | 07-14-2011 |
20100221679 | Adjustable tool drive arrangement - 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. | 09-02-2010 |
20090325123 | Bur for Adjustable Tool Drive Arrangement - 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. | 12-31-2009 |