Tool driving or impacting – Impacting devices – Selective axial direction of impact
Reexamination Certificate
2006-06-27
2006-06-27
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Selective axial direction of impact
C173S212000, C175S019000, C175S296000
Reexamination Certificate
active
07066279
ABSTRACT:
A ground piecing tool includes a housing and an air distributing mechanism that reciprocates a striker to impact a chisel shaft in response to a supply of compressed fluid including a fluid inlet tube mounted in the bore of the striker having a radial port, a rear end of the inlet tube being in communication with the distributing mechanism, wherein the housing and chisel shaft cooperate to define a front chamber that decreases in volume as the chisel moves forward relative to the housing, and wherein the chisel shaft has a radial passage therein that conducts compressed fluid from the radial port of the inlet tube to the front chamber, which is configured to form an air spring.
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Earth Tool Company L.L.C.
Meyers Philip G.
Nash Brian
Smith Scott A.
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