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The
Rolamite was invented by Sandia engineer Donald F. Wilkes and was patented on June 24, 1969. It was invented while Wilkes was working on a miniature device to detect small changes in the inertia of a small mass. After testing an S-shaped metal foil, which he found to be unstable to support
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surfaces, the engineer inserted rollers into the S-shaped bends of the band, producing a mechanical assembly that has very low friction in one direction and high stiffness transversely. It became known as
Rolamite.
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device that loses very little energy to friction. One source claims it is the only basic mechanical invention of the 20th century. Tests by Sandia indicated that
Rolamite mechanisms demonstrated
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at the time. There are known
Rolamite versions that contain two bands that work in reciprocate parallel for more accurate kinematic transmission at the reverse motion.
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Bishop,James E., (11/27/1973). "Remember the
Rolamite? World's 27th-and Newest-'Elementary Mechanism' Still Works, but It Hasn't Revolutionized Technology"
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Norman, Carlisle (February 1968). "The
Amazing Rolamite – It Opens the Door for 1000 Inventions".
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The
Rolamite uses a stressed metal band and counter-rotating rollers within an enclosure to create a
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discovered in the twentieth century and can be used in various ways such as a component in switches,
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Friction
Science and Technology: From Concepts to Applications, Second Edition
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A video of a
Rolamite in operation, to serve as a warhead safety-switch
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Always/Never: The Quest for Safety, Control, and
Survivability - Part 2
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237:. Sandia National Labs. 16 June 2015. Event occurs at 19:30.
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211:. New York: Springer Science+Business Media. p. 249.
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as low as 0.0005, an order of magnitude better than
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23:The Rolamite bearing has very little friction
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209:Structural Synthesis in Precision Elasticity
170:"US Patent #3,452,175: Roller-Band Devices"
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157:. Bonnier Corporation. 1968. p. 96.
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168:Wilkes, Donald F. (June 24, 1969).
401:. You can help Knowledge (XXG) by
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207:Tseytlin, Yakov M. (2007-03-20).
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305:"ScrollerWheel Rotary Rolamite"
16:Low friction bearing technology
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41:in the 1960s. It is the only
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365:Video of a homemade rolamite
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290:The Wall Street Journal
121:Blau, Peter J. (2008).
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453:Bearings (mechanical)
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249:"Rolamite"
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