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:
Jul. 19, 1983
Filed:
Nov. 24, 1981
Applicant:
Inventor:
Herbert Schupphaus, Bochum, DE;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ; E21C / ;
U.S. Cl.
CPC ...
299 81 ; 299 87 ;
Abstract
In cutter-drum apparatus wherein a cutter drum is provided near the back of the cut with a nozzle holder and nozzles for comminuting without dust evolution of the harder material at the back of the cut, improvements whereby (a) the nozzle holder is frusto-conical to accommodate the bulging of the face at the back of the cut, and (b) the cutter drum has a frusto-conical end ring which bears cutter picks that intersect the jets emerging from the nozzles. These cutter picks give the jets a pulsating action, which increases their effectiveness.