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:
Oct. 17, 1978
Filed:
Oct. 06, 1977
Applicant:
Inventor:
Milton L Benjamin, Chagrin Falls, OH (US);
Assignee:
Erickson Tool Company, Solon, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ; B23B / ;
U.S. Cl.
CPC ...
408226 ; 408228 ; 408223 ;
Abstract
A spade drill characterized in that the slotted blade clamping end of the holder has oppositely beveled end surfaces which are perpendicular to the respective side faces of the blade and which are at an angle less than the angle of the respective cutting edges of the blade to define convergent passages of right angle cross section for funneling or tracking chips to diametrically opposite obtuse angle cross section longitudinal grooves in the holder.