Pneumatically reversible ram boring device
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United States of America Patent
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Jan 25, 2011
Issued Date -
N/A
app pub date -
Apr 10, 2006
filing date -
Nov 16, 2005
priority date (Note) -
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Abstract
A pneumatically reversible ram boring device includes a percussion piston (8) that is situated in a casing (1) and is movable back and forth by operation air supplied via an operational-air supply via an operational-air line (5), a control pipe (4, 36, 54) having at least one control opening (13), an outer pipe (15, 65), and a control sleeve (10, 60) that can be displaced by compressed air from a control chamber (16, 66). An essentially torsion-resistant operational-air line (5) can be rotatably connected to a rotary valve (4, 40, 70) that supplies the control chamber with operational air or vents air from the chamber.
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