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. 05, 1991
Filed:
Dec. 22, 1989
Charles L Rassieur, St. Louis County, MO (US);
Central Mine Equipment, St. Louis, MO (US);
Abstract
In an earth drill rig having a drive with a drive stud projecting from it, a Kelly bar, connected to drive a rotary table, and a coupling device associated with the Kelly bar and drive stud for selectively connecting the drive stud to a lower end of the Kelly bar, and a mast carrying the Kelly bar and adapted to be rotated about a pivot axis offset from the long axis of the Kelly bar from an erected position to a folded position, during which the Kelly bar is arcuately translated away from the drive stud, and to be rotated from the folded position to the erected position, during which the lower end of the Kelly bar is arcuately translated toward the drive stud, the Kelly bar is moved axially in a direction away from the drive stud and moved axially in a direction toward the drive stud to permit the coupling and uncoupling of the Kelly bar and the drive stud.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile