The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 24, 1995
Filed:
Feb. 03, 1994
David L Lewis, Raleigh, NC (US);
Victor D Mogilnicki, Raleigh, NC (US);
Thomas J Presby, Raleigh, NC (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A toolholder 1 of the type including a collet 5 integrally formed with a shank 3 is provided with an interface between a locknut 7 and collet 13 which substantially reduces the torque required to turn the locknut 7 into a position which radially collapses the collet segments 17. In this interface, one of either the inner locknut surface 23 or the outer surfaces of the collet segments 17 includes an engaging portion 56 for wedgingly flexing the collet segments 17 inwardly when the locknut is turned, and a non-engaging portion 58 disposed between the engaging portion 56 and the shank mounted ends of the collet segments 17. The non-engaging portion 58 reduces the torque required to turn the locknut 7 by reducing the binding forces that would otherwise occur between the ends of the collet segments 17 and the inner locknut surface 23. To further reduce torque, the collet portion interconnecting the collet segments 17 with the shank 3 of the toolholder is rendered thinner by the provision of circumferential grooves 72, 76 that make the collet segments 17 more flexible. Sealing rings 66, 74, 81 are seated in grooves 68, 72, 76 present in the interior defined by the collet segments 17 in order to prevent errant flows of coolant or debris from collecting between the collet segments 17 and the tool shank 9 gripped thereby.