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:
Feb. 15, 2011
Filed:
Oct. 10, 2007
Hagen Walter Dost, Chicago, IL (US);
Javier Ibarra Sandoval, Schaumburg, IL (US);
Hagen Walter Dost, Chicago, IL (US);
Javier Ibarra Sandoval, Schaumburg, IL (US);
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A spade bit includes a shaft defining an axis, and a blade attached to the shaft and having a first blade portion and a second blade portion. The first blade portion defines a first leading face portion, and the second blade portion defines a second leading face portion. The first blade portion defines a first cutting edge portion, and the second blade portion defines a second cutting edge portion. The first cutting edge portion lies on a first border portion of the first leading face portion, and the second cutting edge portion lies on a second border portion of the second leading face portion. The first cutting edge portion and the second cutting edge portion both lie in a plane P. An area Ais bound by the plane Pand the first leading face portion when the first blade portion is viewed in a first cross section taken along a plane Pwhich is parallel to and spaced apart from the axis by a distance D, and the area Aincreases as the distance Dincreases. The area Ais bound by the plane Pand the second leading face portion when the second blade portion is viewed in a second cross section taken along a plane Pwhich is parallel to and spaced apart from the axis by a distance D, and the area Aincreases as the distance Dincreases.