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:
Dec. 24, 2024
Filed:
Aug. 19, 2021
Lkab Wassara Ab, Huddinge, SE;
Magnus Hörman, Älta, SE;
Fredrik Egerström, Nacka, SE;
Martin Öhnström, Saltsjö-Boo, SE;
Magnus Fridsell, Sollentuna, SE;
LKAB WASSARA AB, Huddinge, SE;
Abstract
The invention relates to a rotary device () for a down-the-hole hammer (), which rotary device is accommodated in a rotation motor housing () and mounted behind a drill housing () for transferring a torque to a drill bit () and a pressurized drive fluid () to a striking mechanism () for the drill bit. The rotary device includes a cam curve with a plurality of drive lobes (-) and working chambers () along a circumference in the rotation motor housing (), a rotor disc () carrying a plurality of radially movable vanes (-), which are accommodated in piston tracks (-) in the rotor disc. Characteristics of the rotary device are that it includes; an odd integer of a number of drive lobes (-), which is equal to or higher than three; an odd integer of a number of working chambers (), which is equal to or higher than three; an odd integer of a number of vanes (-), which is equal to or higher than three, and wherein said number of vanes are simultaneously pressurized in each working chamber ().