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1. WO1992014573 - COLLET-WEAR REDUCING DRILL BIT

Publication Number WO/1992/014573
Publication Date 03.09.1992
International Application No. PCT/US1992/001566
International Filing Date 24.02.1992
Chapter 2 Demand Filed 23.09.1992
IPC
B23B 31/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
BTURNING; BORING
31Chucks; Expansion mandrels; Adaptations thereof for remote control
CPC
B23B 2226/61
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
BTURNING; BORING
2226Materials of tools or workpieces not comprising a metal
61Plastics not otherwise provided for, e.g. nylon
B23B 31/005
BPERFORMING OPERATIONS; TRANSPORTING
23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
BTURNING; BORING
31Chucks
005Cylindrical shanks of tools
Y10T 408/78
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
408Cutting by use of rotating axially moving tool
78Tool of specific diverse material
Y10T 408/907
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
408Cutting by use of rotating axially moving tool
89Tool or Tool with support
907including detailed shank
Applicants
  • HEMMINGS, David, T. [US]/[US]
Inventors
  • HEMMINGS, David, T.
Agents
  • CHAPIN, William, L.
Priority Data
661,43325.02.1991US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) COLLET-WEAR REDUCING DRILL BIT
(FR) MECHE DE PERÇAGE POURVUE D'UNE VIROLE ANTI-USURE
Abstract
(EN)
An improved drill bit (66) having a generally cylindrically shaped shank (68) has a reduced diameter rear shank portion forming a central coaxial stem (73) with a rear transverse face (69) comprising the butt-end of the drill bit. An annular wear reduction ring (75) made of softer material than the shank material and having an outer diameter approximately equal to the diameter of the shank forward of the reduced diameter portion of the shank fits over the stem. The softness of the wear reduction ring protects collets, into which the bit is inserted to and removed, from abrasive wear, thereby extending useful life of the collet.
(FR)
Mèche de perçage (66) perfectionnée dont la verge (68) communément cylindrique présente en son extrémité un secteur de moindre diamètre formant queue (73) sur le même axe, dont la face transversale arrière (69) constitue le bout de la mèche. Une bague (75) anti-usure, réalisée dans un matériau plus tendre que celui dans lequel est réalisée la verge de la mèche, et présentant un diamètre extérieur sensiblement égal au diamètre de la verge en avant du secteur à diamètre réduit formant la queue de la mèche s'adapte sur celle-ci. Cette bague, par sa souplesse prémunit le mandrin dans lequel la mèche est insérée ou duquel elle est retirée de l'usure par abrasion, prolongeant ainsi la durée d'utilisation dudit mandrin.
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