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:
Jun. 19, 2018
Filed:
Dec. 06, 2013
National Oilwell Dht, L.p., Houston, TX (US);
Rory McCrae Tulloch, Aberdeen, GB;
Alan Martyn Eddison, York, GB;
Alastair Henry Walter Macfarlane, Angus, GB;
NATIONAL OILWELL DHT, L.P., Houston, TX (US);
Abstract
A drilling assembly assembly includes a hammer motor, a shaft, a driver, and a hammer (). The shaft is operatively connectable to the hammer motor and rotated thereby. The driver is operatively connectable to the shaft, and includes a cam (such as guide channel) rotatable with the shaft and a fixed guide (such as guide pins) having a guide surface thereon. The cam is engageable with the guide surface and axially movable thereabout during rotation thereof. The hammer is operatively connectable to the driver and axially movable therewith, axially movable within the housing () independently from axial movement of the housing, and engageable with the bit to impart an impact thereto whereby the bit is hammered.