I need a roller-clutch ratchet assembly, not as part of a tool, but as
a
stand-alone component (about 25mm diameter).
NASA researchers have produced one which they incorporate in a wrench.
References below:
(3-D Sprag Ratcheting Tools
 Inventors: Michael O. Wade and James W.Poland, Jr.
 Invention Disclosure Submitted: 27 June 1996
 Case Number: GSC 13,802)
Vranish, J. M., "Three-Dimensional Roller Locking Sprags,"
 U.S. Patent 5,482,144, January 1996)

I can't locate anything else myself, any help or info will be much
appreciated,
and of course paid for.
Thanks, Don Smith email donsmith@myoffice.net.au

Some info:

http://wrench.ssl.umd.edu/sprags/default.html
http://wrench.ssl.umd.edu/commercial/default.html

Contact email for the above: broberts@ssl.umd.edu

From: http://wrench.ssl.umd.edu/contact.html

Information on three-dimensional (3-D) sprags 

John Vranish
3-D sprag inventor
address:

NASA/Goddard Space Flight Center
Electromechanical System Branch
Greenbelt, MD 20771-0001 
phone: 301.286.4031
fax: 301.286.1613
e-mail: john.m.vranish.1@gsfc.nasa.gov 
Information on the commercial 3-D sprag wrench 

Mike Wade
Senior Aerospace Engineering Technician
Commercial hand wrench inventor
address: 
NASA/Goddard Space Flight Center
Code 547.1
Greenbelt, MD 20771-0001 
phone: 301.286.9101
fax: 301.286.1693
e-mail: michael.wade@gsfc.nasa.gov 
Information on the 3-D roller commercial and EVA wrenches 

Brian Roberts
NASA Graduate Student Research Fellow
EVA 3-D roller wrench engineer
address: 
Space Systems Laboratory
Neutral Buoyancy Research Facility
University of Maryland
College Park, MD 20742 
phone: 301.405.7353
fax: 301.314.9738
e-mail: broberts@ssl.umd.edu 
Transfer and commercialization of the technology 

Darryl Mitchell
Commercial Program Manager
address: 
NASA/Goddard Space Flight Center
Technology Commercialization Office
Code 750.0
Greenbelt, MD 20771-0001 
phone: 301.286.5169
fax: 301.286.0301
e-mail: darryl.mitchell@gsfc.nasa.gov 
Patent licensing information 

Keith Dixon
address: 
NASA/Goddard Space Flight Center
Patent Counsel
Code 750.0
Greenbelt, MD 20771-0001 
phone: 301.286.9279
fax: 301.286.1713
e-mail: keith.l.dixon.1@gsfc.nasa.gov


There is: http://www.honeybeerobotics.com/sprag.htm

The Honeybee RACLS technology is closely related to another
NASA-sponsored technology: "Three-dimensional roller locking sprags"
(see patent info below). Because we believe that these technologies
are complementary and that most suitable mechanism applications will
require both, Honeybee Robotics has obtained a non-exclusive license
for the 3D Locking Sprag technology from NASA and is thus able to pass
both technologies on to propective licensees within one licensing
agreement.


More at:

http://technology.nasa.gov/scripts/nls_ax.dll/twDispTOPSItem(111;TOP-637;0;1)


Searched on: 5,482,144 (the patent number)