Processing

Please wait...

Settings

Settings

Goto Application

1. WO2020107063 - DRILL BIT FOR BORING EARTH AND OTHER HARD MATERIALS

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

AMENDED CLAIMS

received by the International Bureau on 1 1 May 2020 (1 1.05.2020)

1 . A drill bit assembly for drilling a hole through earth, the drill bit assembly comprising:

a bit body extending between a first end and a second end along a longitudinal axis of the bit body with a connecting arrangement positioned at the first end of the bit body for coupling the bit body to a rotating shaft for providing rotational torque to the bit body;

a cutting head including a leading tip portion for cutting into earth and a trailing receiving portion for receiving the second end of the bit body in an internal cavity defined by the receiving portion to allow the cutting head to be removably coupled to the second end of the bit body;

a retaining arrangement to retain the second end of the bit body in the receiving portion of the cutting head wherein the bit body comprises a hollow passage for receiving a resiliently biased pin member that forms part of the retaining arrangement.

2. A drill bit assembly in accordance with claim 1 wherein the bit body comprises a stop member positioned along an outer wall of the bit body to limit axial movement of the receiving portion of the cutting head towards the first end of the bit body.

3. A drill bit assembly in accordance with any one of the preceding claims wherein the connecting arrangement comprises one or more helical threads provided along an outer wall portion at or adjacent the first end of the bit body to couple the bit body to a rotating shaft for providing rotational torque to the bit body.

4. A drill bit assembly in accordance with any one of the preceding claims wherein the tip portion of the cutting head comprises a polycrystalline diamond compact (PDC) material.

5. A drill bit assembly in accordance with any one of the preceding claims wherein the retaining arrangement further comprises a detent assembly for detachably interlocking the cutting head and the bit body.

6. A drill bit assembly in accordance with claim 5 wherein the detent assembly comprises:

a detent groove positioned along an inner wall of the receiving portion that defines the internal cavity for receiving the second end of the bit body;

a detent provided at or adjacent the second end of the bit body along an outer wall of the bit body;

wherein axial movement of the receiving portion of the cutting head towards the first end of the bit body results in engagement and retention of the detent within the detent groove.

7. A drill bit assembly in accordance with any one of the preceding claims wherein the resiliently biased pin member comprises a spring loaded pin member.

8. A drill bit assembly in accordance with claim 7 wherein the pin member is biased by the spring member for movement towards the first end of the bit body.

9. A drill bit assembly in accordance with claim any one of the preceding claims further comprising a cap member to retain the pin member within the hollow passage of the bit body and limit movement of the pin member in a direction towards the first end of the bit body.

10. A drill bit assembly in accordance with any one of the preceding claims wherein the pin member comprises:

a head portion adapted to be positioned adjacent the first end of the bit body; a tail portion adapted to be positioned adjacent the second end of the bit body; and

a pin body portion extending between the head and tail portions of the pin member.

1 1 . A drill bit assembly in accordance with claim 10 wherein the tail portion is narrower than the pin body portion to accommodate a resilient member in between outer walls of said tail portion of the pin member and inner walls of the bit body defining said hollow cavity.

12. A drill bit assembly in accordance with claim 1 1 wherein the resilient member urges against a shoulder of the pin body portion to apply said resilient bias on the pin member.

13. A drill bit assembly in accordance with claim 1 1 or claim 12 wherein the hollow cavity of the bit body comprises a narrower throat portion extending towards the second end and wherein axial movement of the pin member towards the second end of the bit body by application of force against the resilient bias of the resilient member results in the cutting head being uncoupled from the bit body by releasing the retaining arrangement.

14. A drill bit assembly in accordance with claim 13 wherein the pin member comprises a notch positioned on the pin body such that during use, the axial movement of the pin member towards the second end of the bit body results in the notch being axially displaced and becoming positioned adjacent said detent assembly thereby

allowing said detent to be received into the notch and be released from the detent groove of the cutting body.

15. A drill bit assembly in accordance with any one of the preceding claims wherein the cutting head is movably mounted relative to the bit body.