Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1975-09-05
1977-04-05
Purser, Ernest R.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173 66, 173 73, E21B 500, E21C 700
Patent
active
040156702
ABSTRACT:
A fluid operated hammer for rock drills comprising; a cylinder, a drill chuck mounted at one end to receive a drill bit; a drill sub attached to the other end; a tubular fluid feed tube mounted in the drill sub and extending towards the chuck, the longitudinal central axis of the feed tube corresponding to the longitudinal central axis of the cylinder; at least one set of apertures provided in the side wall of the feed tube and spaced from each end; a piston slidably mounted in the cylinder and over the feed tube to move between the drill chuck and drill sub the lower end being adapted for striking a portion of the drill bit extending through the drill chuck; a first passageway in said piston communicating with one end face thereof and opening into the center of the piston at a location spaced along the length of said piston; a second passageway in said piston communicating with the end face of the piston communicating with the end of the piston opposite to that of the first passageway and opening into the center of the piston at a location spaced along said piston, said first passageway communicating with one of said set of apertures in the feed tube when the piston is in abutting relationship with the chuck to admit fluid into the space between the piston and drill chuck to drive the piston upwards and said second passageway communicating with one of said set of apertures when the piston is at its upper position in the cylinder to admit fluid into the space between the piston and drill sub to drive the piston downwards.
REFERENCES:
patent: 2887989 (1959-05-01), Dulaney
patent: 3225841 (1965-12-01), Thompson
patent: 3826316 (1974-07-01), Bassinger
patent: 3896886 (1975-07-01), Roscoe, Jr.
Drucker William A.
Pate III William F.
Purser Ernest R.
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