Browse Prior Art Database

PARACIRCLE MECHANISM

IP.com Disclosure Number: IPCOM000005502D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-10
Document File: 3 page(s) / 93K

Publishing Venue

Motorola

Related People

Robert Hecht-Nielsen: AUTHOR

Abstract

It is useful in some apparatus to have a mechanism capable of rapid but precise changes in radius. Examples of such apparatus include devices for forming circular shapes, machines for sealing lids on semiconductors and other containers, and optical and radar reflective and refractive components of variable circular shape. Prior approaches to providing changes in radius for such apparatus have in- cluded use of drill chucks, lathe collets, rolling container sealers and optical servo mechanisms. However, none of these apparatus are particularly rapid or precise.

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. . . :@;, MOTOR OLA Technical Developments Volume 3 March 1983

PARACIRCLE MECHANISM

By Robert Hecht-Nielsen

   It is useful in some apparatus to have a mechanism capable of rapid but precise changes in radius. Examples of such apparatus include devices for forming circular shapes, machines for sealing lids on semiconductors and other containers, and optical and radar reflective and refractive components of variable circular shape. Prior approaches to providing changes in radius for such apparatus have in- cluded use of drill chucks, lathe collets, rolling container sealers and optical servo mechanisms. However, none of these apparatus are particularly rapid or precise.

   A paracircle mechanism may be used to provide extremely rapid but precisely co.circular changes in radius of pivot points on slides attached to a rigid body. A paracircle mechanism is a means for mechanically equating the parallel displacement of a body to a change of radius of an arbitrary number of co-circular points.

   In the paracircle mechanism shown in FIG. 1, a bundle 10 of flexible linkages 20 is passed over a pulley mechanism 12 which is rigidly attached to a surface at point A. Flexible linkages 20, which may be wires or ropes, are attached to sliders which are constrained to vertical rails at points C, D, E and F on a rigid body 30. Tha sliders are also attached to first ends of rigid linkages 40, the second ends of which are all attached to a pivot mechanism which is in turn rigidly attached to a surface at point B.

   If flexible linkage bundle 10 is pulled thus shortening all of flexible linkages 20 by the same amount, rigid body 30 will move left and its slide rails will remain exactly vertical as it doe...