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:
Nov. 08, 1977
Filed:
Jan. 22, 1976
Applicant:
Inventor:
Siegfried Sigott, Zeltweg, OE;
Assignee:
Vereinigte Osterreichische Eisen-und Stahlwerke, Vienna, OE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
279 77 ; 279 76 ; 279 97 ;
Abstract
A drift advancing machine or the like having a cutting head with replaceable bits. Each bit is disposed in a sleeve-shaped bit holder fixed to the cutting head. Arranged at an oblique angle to the axis of each bit is a pivotal locking bolt having a first pivotal position wherein it engages a recessed portion of the bit and prevents removal of the bit, and a second pivotal position wherein it is out of engagement with the recessed portion of the bit and allows removal of the bit. The front end of the locking bolt is shaped particularly for engagement with the bit recessed portion.