Diamond core drill bit

Details Diamond core drill bit Diamond core drill bit

2007-04-17

2007-04-17

Rose, Robert A. (Department: 3723)

Stone working

Sawing

Disk cutting

C451S548000

Reexamination Certificate

active

11307998

ABSTRACT:
A diamond core drill bit (100) is disclosed. The drill bit has a right-circular cylindrical body (120) with at least one side lubrication hole (122) toward the bottom of the body and a plurality of parallel grooves (124) oriented in an axial direction at the bottom circumferential sidewall of the body. A cap (130) at the top of the cylindrical body (120) closes one end of the body. The cap has a central lubrication hole (134) and alternative embodiments have at least one core extraction hole (132). These holes extend through the cap to the interior of the body. A hollow drive shaft (140) is mated to the cap (130) over the central lubrication hole (134), such that a lubricant can flow through the hollow shaft and into the internal volume of the body and out a side lubrication hole (122). Diamond grit (160) is bonded around the bottom edge on a portion of the internal and external sidewall surfaces at the bottom circumferential edge of the body (120) in such a way that the diamond grit (160) is bonded over a portion of the axial height of the grooves (124).

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