On the Galloway-Type of Spatial Mechanisms

[+] Author and Article Information
J. Rastegar

Department of Mechanical Engineering, State University of New York At Stony Brook, Stony Brook, NY 11794

J. Mech. Des 112(4), 466-471 (Dec 01, 1990) (6 pages) doi:10.1115/1.2912633 History: Received March 01, 1988; Online June 02, 2008


The Galloway mechanism is a plane four-bar, drag-link-type linkage with one pair of equal-length shorter links, and one pair of equal-length longer links, forming a rhomboid geometry. The short links constitute the frame and the input links. In a Galloway mechanism, two full rotations of the input link result in a single rotation of the output link. In this paper, the Galloway mechanism is analyzed and the rules governing its motion are found. The conditions necessary for the existence of a Galloway-type spatial mechanism are then determined. As an example, the necessary relationships between the geometric parameters of a spatial RRRSR mechanism are derived. A numerical example is included.

Copyright © 1990 by The American Society of Mechanical Engineers
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