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Title: Maneuvering impact boring head

An impact boring head may comprise a main body having an internal cavity with a front end and a rear end. A striker having a head end and a tail end is slidably mounted in the internal cavity of the main body so that the striker can be reciprocated between a forward position and an aft position in response to hydraulic pressure. A compressible gas contained in the internal cavity between the head end of the striker and the front end of the internal cavity returns the striker to the aft position upon removal of the hydraulic pressure. 8 figs.
Authors:
;
Publication Date:
OSTI Identifier:
672665
Report Number(s):
US 5,794,718/A/
PAN: US patent application 8-613,301
DOE Contract Number:
AC07-94ID13223
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 18 Aug 1998
Research Org:
Lockheed Martin Idaho Tech Co
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; HYDRAULIC EQUIPMENT; IMPACT SHOCK; COMPRESSED GASES; HYDRAULIC FLUIDS; DESIGN; OPERATION