The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2002
Filed:
Sep. 07, 2000
Werner Kleine, Achim, DE;
Hans-Werner Bongers-Ambrosius, München, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A drilling tool ( ), especially a rock drilling tool, has an axially extending shaft ( ) with one end arranged to seat in a chuck of a drilling device and the opposite end securely connected to a drilling head ( ). The drilling head has at least three hard metal cutting members ( and ) with at least two adjacent cutting members located at the outer circumferential surface of the drilling head and preferably projecting radially outwardly from the circumferential surface. The cutting members are spaced circumferentially apart at an angle in the range of about 100° to about 150°. Drilled material grooves ( and ) separate the cutting members ( and ) in the circumferential direction. In turn the drilled material grooves ( and ) discharge into at least one discharge groove extending helically around the shaft. A circle (E) encircling the drilling head ( ) is formed by the radially outer edges of the outwardly projecting cutting members. The circle (E) has a diameter (e) at least equal to 15 mm and preferably at least equal to 18 mm. The drilled material grooves located between the cutting members ( and ) are spaced apart by an angle (&bgr;) in a range of about 100° to about 150°. The drilled material grooves ( and ) are located in a region ( ) of the outer circumferential surface with an opening to the grooves having an aperture angle &agr; in the circumferential direction with a value &agr;≦100−e and an axial extent (f) with a value of >0.