US 12,392,202 B2
Down-the-hole drill hammer having a ribbed exhaust tube
Leland H. Lyon, Roanoke, VA (US)
Assigned to Center Rock Inc., Berlin, PA (US)
Filed by Center Rock Inc., Berlin, PA (US)
Filed on Oct. 11, 2023, as Appl. No. 18/484,900.
Prior Publication US 2025/0122763 A1, Apr. 17, 2025
Int. Cl. E21B 10/36 (2006.01); E21B 4/14 (2006.01)
CPC E21B 10/36 (2013.01) [E21B 4/14 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A down-the-hole hammer comprising:
a housing;
a drill bit disposed about a distal end of the housing, the drill bit including:
a head, and
a shank extending from the head, the shank including a bore having a plurality of ribs; and
an exhaust tube configured to be coupled to the shank, the exhaust tube including an inwardly tapered distal end having a plurality of ribs for engaging the plurality of ribs of the shank.