Drill bit with detachable bit head
AssigneeMincon International Limited
InventorsJoseph Purcell, Ciaran Purcell
Life of this patent
Estimating the term…
Abstract
A drill bit assembly for fluid-operated percussion drill tools. The assembly comprises a percussion bit comprising a bit head detachably connected to an axially extending shank and engagement means formed on an external wall of the shank engageable with complementary engagement means formed internally of a drive chuck whereby rotational drive from the chuck may be transmitted to the shank. At least one flushing channel extends between the external wall of the bit shank and a cutting face of the bit head, to provide a fluid path for a flushing medium between the external wall of the bit shank and the cutting face of the bit head.
Claims12
A drill bit assembly for fluid-operated percussion drill tools comprising:
- a percussion bit comprising a bit head detachably connected to a shank extending along a longitudinal axis;
- engagement means formed on an external wall of the shank engageable with complementary engagement means formed internally of a drive chuck whereby rotational drive from the drive chuck may be transmitted to the shank;
- at least one flushing channel extending through the shank and the bit head between the external wall of the shank and a cutting face of the bit head, to provide a fluid path for a flushing medium between the external wall of the shank and the cutting face of the bit head, each of the at least one flushing channels comprising:
- a first channel portion in the shank extending through the shank from the external wall of the shank at a first end of the first channel portion to an end face of the shank adjacent the bit head at a second end of the first channel portion;
- and
- a second channel portion extending through the bit head,
- wherein the bit head comprises a shroud that extends along the longitudinal axis and beyond the first end of the first channel portion.
A drill bit assembly for fluid-operated percussion drill tools comprising:
- a percussion bit comprising a bit head detachably connected to a shank extending along a longitudinal axis;
- engagement means formed on an external wall of the shank engageable with complementary engagement means formed internally of a drive chuck whereby rotational drive from the drive chuck may be transmitted to the shank;
- at least one flushing channel extending through the shank and the bit head between the external wall of the shank and a cutting face of the bit head, to provide a fluid path for a flushing medium between the external wall of the shank and the cutting face of the bit head, each of the at least one flushing channels comprising:
- a first channel portion in the shank extending through the shank between the external wall of the shank at a first end of the first channel portion and a threaded portion of the shank at a second end of the first channel portion;
- and
- a second channel portion extending through the bit head,
- wherein the first end of the first channel portion intersects the external wall of the shank, and
- wherein the second end of the first channel portion intersects the threaded portion of the shank.
A drill bit assembly for fluid-operated percussion drill tools comprising:
- a percussion bit comprising a bit head detachably connected to a shank extending along a longitudinal axis;
- engagement means formed on an external wall of the shank engageable with complementary engagement means formed internally of a drive chuck whereby rotational drive from the drive chuck may be transmitted to the shank;
- at least one flushing channel extending through the shank and the bit head between the external wall of the shank and a cutting face of the bit head, to provide a fluid path for a flushing medium between the external wall of the shank and the cutting face of the bit head;
- and
- a chamber allowing fluid communication between the first channel portion and the second channel portion;
- the chamber being provided between the end face of the shank and the bit head such that the end face of the shank is spaced apart from an internal rear face of the bit head.
Dependencies are inferred from the claim text.