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:
Sep. 01, 2026
Filed:
Jan. 26, 2024
Center Rock Inc., Berlin, PA (US);
Leland H. Lyon, Roanoke, VA (US);
Center Rock Inc., Berlin, PA (US);
Abstract
A down-the-hole drill hammer including a drill bit about a distal end of the hammer and a piston for percussively contacting the drill bit. The drill hammer further includes a valve assembly for supplying and exhausting drive fluid to and from the piston, the valve assembly having a valve housing in fluid communication with drive fluid supply ports, drive ports and exhaust ports, and a control valve movable within the valve housing and in fluid communication with the valve housing. The drill hammer further includes a piston follower valve unconnected to the piston movable within the control valve for controlling positioning of the control valve and pressures applied to the piston via the drive ports and exhaust ports.