| 摘要 |
FIELD: mechanical engineering; antenna positioning; robotics and other industries. SUBSTANCE: turnaround device designed according to first alternative is made in the form of crank-and-rocker mechanism and has link gear whose links are coupled with those of crank-and-rocker mechanism. Turnaround device tailored to second alternative is provided with link gear and one of its links carries rigidly fixed pivoting base with one more crank-and-rocker mechanism and one more link gear. Turnaround device built according to third and fourth alternatives is provided with control rod and cranks are coupled with link gears. Third and fourth alternatives differ in that the former has each of its link gears joined with base and rocker and the latter has one link gear coupled with base and control rod and other, with rocker and control rod. Fifth and sixth alternatives are characterized in that turnaround device has control rod with base and output link in the form of platform for revolving in two planes and in that cranks are coupled with link gears. In addition turnaround device is provided with two link gears. Fifth and sixth alternatives differ in that the former has its two first link gears coupled with platform and base and each of two other ones, with any two links of turnaround device while in the latter first link gear is coupled with base and control rod, second one, with rocker and control rod, third and fourth link gears, with any two respective links of turnaround device. Seventh alternative of turnaround device is provided with two control rods coupled with base and platform- shaped output link designed in one case for rotation in two planes and in other case, for rotation in two or more planes with cranks joined to link gears. In addition device is provided with third link gear. EFFECT: enhanced load-carrying capacity and stiffness of device; provision for independent turn of output link in two coordinate axes. 11 cl, 9 dwg
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