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[[Image:ScrollerwheelPatentImage.jpg|thumb|upright|Structure of a scrollerwheel]]
A '''scrollerwheel''' is a mechanical device composed of a number of rollers (four or more) and connective bands under [[tension (physics)|tension]], which wrap around and weave between the rollers forming a self-supporting cluster possessing a central roller. The cluster of rollers is bound by the connective bands in such a way that the [[static friction]] between the rollers and bands prevent the rollers from slipping as they roll and orbit the central roller.<ref>[http://www.businessweek.com/archives/1995/b343792.arc.htm Canadians Reinvent the Wheel]''Business Week'' August 14, 1995</ref> Scrollerwheels are related in operational principle to [[rolamite]] linear bearings (developed at [[Sandia National Labs]] in the late 1960s), and like them, they display only rolling friction, and not the kinetic friction inherent in most mechanical bearings.

The rollers can have a [[cross section (geometry)|cross section]] in a variety of shapes other than circular, such as: [[oval]]s (which with a single oval roller as the central roller, or one of the outer rollers, results in a [[cam]]med motion), various varieties of [[superellipse]]s and [[Reuleaux polygon]]s.

==Advantages==

Unlike conventional [[rolling-element bearing]]s, they do not require [[lubrication]]. Consequentially, they can be employed in environments hostile to [[lubricant]]s: underwater, in a [[vacuum]] (where grease will boil) and at elevated temperatures.

They can be constructed from a wide variety of materials, have zero [[backlash (engineering)|backlash]], and they are not fouled by gritty particulates.

==Disadvantages==

Scrollerwheels cannot have an [[aspect ratio]] (diameter compared to thickness) as high as conventional mechanical bearings.

==See also==

*[[Rolamite]]

==References==
{{Reflist}}

==External links==
*[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=5,462,363.PN.&OS=PN/5,462,363&RS=PN/5,462,363 U.S. Patent #5,462,363]
*[http://erikbrinkman.com/Scroller/Home.html ScrollerWheel Details]

[[Category:Simple machines]]
[[Category:Rolling-element bearings]]
[[Category:Wheels]]

{{tech-stub}}

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