Showing papers on "Revolute joint published in 1967"

Synthesis of Spatial Four-Bar Mechanisms : Part I, Classification of Mechanisms and Synthesis of a Mechanism with Two Revolute Pairs, One Cylindric pair and One Spheric Pair

Abstract: Spatial four-bar mechanisms are studied with the purpose of utilizing them as generators of functions with one variable. In Part I, the moving closed circuits are first described in connection with the degrees of freedom of spatial mechanisms, and then a number synthesis is made to result in 95 kinds of mechanisms having a single degree of freedom between the driving and driven links. Among them are included many mechanisms whose total number of degrees of freedom is not one. The mechanisms are limited to ones composed of practical pairs, i.e., revolute, prismatic, cylindric, spheric and sphere-groove pairs. A dimensional synthesis is also made with three precision points for a mechanism with two revolute pairs, one cylindric pair and one spheric pair. The equations of the synthesis are given in the form convenient for programming of electronic digital computers.

Synthesis of Spatial Four-Bar Mechanisms : Part II, Synthesis of Mechanisms with Two Spheric Pairs

Abstract: In Part II, are developed the methods of dimensional synthesis of two spatial four-bar mechanisms, A1·2·1 mechanism having two revolute and two spheric pairs and A1·2·2 mechanism having one revolute, one prismatic and two spheric pairs : eight-precision-point synthesis of A1·2·1 mechanism and four- and six-precision-point syntheses of A1·2·2 mechanism are introduced. The conditions that both mechanisms are symmetrical are considered and the syntheses to generate symmetrical functions are also introduced : the functions generated by A1·2·1 and A1·2·2 mechanisms may coincide with the ideal functions at ten and eight points respectively. Examples of the syntheses are presented, which show that both mechanisms may generate much more precise functions than planar four-or six-bar mechanisms do.