NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Mechanical Coal-Face FracturerRadial points on proposed drill bit take advantage of natural fracture planes of coal. Radial fracture points retracted during drilling and impacted by piston to fracture coal once drilling halts. Group of bits attached to array of pneumatic drivers to fracture large areas of coal face.
Document ID
19830000419
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Collins, E. R., Jr.
(Caltech)
Date Acquired
August 11, 2013
Publication Date
April 1, 1984
Publication Information
Publication: NASA Tech Briefs
Volume: 8
Issue: 1
ISSN: 0145-319X
Subject Category
Machinery
Report/Patent Number
NPO-15847
Accession Number
83B10419
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available