Patent ID: 6109841
Filing Date: 2000-08-29
Classification: B23B,Y10S,Y10T

Abstract:
A drilling tool for drilling a bore having a depth greater than four times a diameter of the bore, comprising:a drill shaft having a first end and a second end, said first end having a clamp shaft for attachment to a machine tool;a drill bit having an attachment end and a cutting end, the attachment end detachably connected to said second end of said drill shaft and said cutting end comprising two cutting edges located symmetrically to a longitudinal axis of the drilling tool;said attachment end of said drill bit comprising drive devices on a radial periphery for receiving a drive force form said drive shaft;an attachment device having a first element on said second end of said drill shaft and a second element on said attachment end of said drill bit for axially centering said drill bit;complementary formed devices on said second end of said drill shaft for receiving said drive devices, said drive devices being securable in said formed devices by fixing elements which are fixedly insertable transversely to the longitudinal axis of said drilling tool; andwherein said entire drill bit is integrally formed from a homogeneous material comprising one of powder metal, diamond metal, and ceramic metals; andwherein said drill bit has a diameter and said drill bit and said drill shaft together have an overall length greater than four times said diameter of said drill bit.