Tool for Removing Drill Cores from Hammer Drill Bits

Abstract

An attachment for removing a drill core from a hollow volume of a hollow drill bit, comprising an attachment sheath embodied to be arranged at an accepting shaft comprising at least one ejection element, which is embodied in the hollow volume of the hollow drill bit and designed for transferring a force upon the drill core.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to German Patent Application DE 2011 005 903.2, filed Mar. 22, 2011, and entitled “Werkzeug zur Bohrkornentfernung aus Hammerbohrkronen” (“Tool for Removing Drill Cores from Hammer Drill Bits”), which is hereby incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to a device, a tool, a system, and a method for removing a drill core from a hollow drill bit, particularly a hammer drill core.[0003]DD 277 875 A1 discloses a method for removing a drill core when drilling with core drilling devices. It provides that after the drilling and the breaking of the drill core a wedge is inserted into the drill bit, slightly inclined. Then the drill bit is pressed into the drilling gap and the drill core is clamped tightly against the interior wall by said wedge. When pulling out the drill bit the drill core is entrained and subsequently carefully tapp...

AI Technical Summary

Benefits of technology

The patent describes a way to remove a core from a drill bit. It involves using a tool called an attachment sheath that is placed inside the drill bit and has a part that pushes against the core. The attachment sheath is connected to a shaft, which is used to transfer force to the attachment. This tool helps to make drilling easier and faster.

Problems solved by technology

Here, the safety of the operator may be compromised when the impinging tool slips.

However, it may occur that the spring force of the ejection spring is insufficient to independently eject the drill core.

Particularly in case of a drill core jammed in the drill bit the user relies on a hard material to beat the hollow drill core until the drill core moves out of the hollow drill bit or, in case of a rear removal according to prior art, needs to use an impinging tool with a high risk for slipping off.

On the one hand, this may damage the hollow drill bit, on the other hand it may represent a safety risk for the user.

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