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1. (WO2017149061) ELECTRICAL HAND-HELD CORE DRILLING DEVICE

Pub. No.:    WO/2017/149061    International Application No.:    PCT/EP2017/054865
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: B23B 51/04
B23B 31/00
B23B 31/113
Applicants: HILTI AKTIENGESELLSCHAFT
Inventors: KOSLOWSKI, Oliver
TAACK-TRAKRANEN, John Van
Title: ELECTRICAL HAND-HELD CORE DRILLING DEVICE
Abstract:
An electrical hand-held core drilling device having a tool receiving piece (70) on which precisely three regularly spaced-apart bearing surfaces (71), which each face the stop surfaces (57), are provided, wherein the bearing surfaces (71) for their part form an axial stop, oriented in the opposite direction with respect to the stop surfaces (57), for an insertion end (210), located in a locking rotary position (SL), of a diamond core bit (200) by means of mating bearing surfaces (71') formed on the insertion end (210), wherein precisely three regularly spaced-apart studs (73) project from the bearing surfaces (71), delimiting the bearing surfaces (71) in each case on one side, a respective stud surface (75) being formed on said studs, the respective surface normal of said stud surfaces being oriented perpendicularly to the axis of rotation (R) and tangentially to the circumference (UW) such that transmission of torque takes place in the operating direction of rotation (BR) from the tool receiving piece (70) to the insertion end (210), when the latter is in the locking rotary position (SL) and the compression spring arrangement (60) is comparatively less pressurized, only by way of a form fit between the three stud surfaces (75) and the stud mating surfaces (75'), corresponding thereto, on the insertion end (210), wherein each of the three stud surfaces (75) extends at most half as widely in the radial direction (RR) as a respective bearing surface (71) in the radial direction (RR).