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:
Aug. 04, 1981
Filed:
Sep. 20, 1979
Terry M Runk, Stillwater, MN (US);
Longyear Company, Minneapolis, MN (US);
Abstract
Core drilling apparatus that includes a wire line core barrel inner tube assembly movable through a drill stem to be seated in a latched core taking position adjacent the drill stem core bit and an overshot assembly coupled to the inner tube assembly for lowering and/or withdrawing the inner tube assembly in the drill stem. The inner tube assembly includes an overshot coupling assembly having a base member extended into the latch release tube for limited movement relative thereto, a spearpoint assembly connected to the base member for pivotal movement through an angle of about 180.degree. about a transverse pivot axis, and a detent plunger resiliently mounted by the subassembly to extend into a base recess when the central axes of the base and coupling members are nearly aligned to releasably retain said members in relative positions that their axes are aligned, and to abut against a base tapered surface when the subassembly central axis is at a substantial angle relative the base central axis.