Detachable drill bit

Abstract

The submitted design has same functions and usage as conventional drill heads. It consists of two parts, a solid and a recess truncated cone with 4 sets of troughs and teeth. The two parts are locked together with 4 slotted spring pins. The highly worn drill head can be detached and replaced even with one of different size or different type if needed. Such design feature is thus highly versatile and economical. The design ensures even distribution and absorption of impact force and torque. The integrity of the whole structure while drilling is thus maintained.

1 . I claim a detachable drill bit comprising: main body and detachable head
 The main body consists of a solid truncated cone with an inclination of 6°, 4 troughs at the base of the cone, a flat spline connected to a percussion device/plunger.   The detachable head consists of a recessed truncated cone with an inclination of 6°, inserts and 4 teeth at the base of the recessed cone.   The mating of the main body and detachable head through the solid and recessed truncated cone counters the impact force due to drilling and maintains the integrity of the whole structure.   The mating of the four teeth and troughs counters the independent rotation of the two parts caused by the torque while drilling   4 slotted spring pins are used to lock both the main body and detachable head together through the pre-drilled holes in the 4 teeth and in the base with troughs   In accordance with the claims thereof:   The characteristics features of the above-mentioned new design drill head are found on its main body and detachable head. The mating of solid and recessed cone, together with the teeth and troughs results in a drill head. The two parts are locked together with 4 slotted spring pins. This is the way the Detachable Drill Bit set forth in claim is assembled.