Straight line mechanism

Machine element or mechanism – Control lever and linkage systems – Multiple controlling elements for single controlled element

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Details

74103, 74469, 901 28, B25J 1800

Patent

active

052378870

ABSTRACT:
The apparatus includes a static base, a platform, a first arm assembly, and a second arm assembly. The first arm assembly has a first terminal portion pivotally connected at a first pivot point to a first portion of the static base and a second terminal portion pivotally connected to the platform at a second pivot point. The first arm assembly is so constructed to permit changes in the distance between the first and second pivot points, but is concomitantly constrained to movement in a desired first plane. The second arm assembly has a respective first terminal portion pivotally connected at a third pivot point to a second portion of the static base and a respective second terminal portion pivotally connected to the platform at a fourth pivot point. The second arm assembly is so constructed to permit changes in the distance between the third and fourth pivot points but is constrained to movement in a desired second plane which is angularly disposed from the first plane. The motion of the platform is constrained to a straight line when the distance between the first and second pivot points and/or the distance between the third and fourth pivot points is changed. The straight line has a direction parallel to an imaginary line defined by the intersection of the first and second planes.

REFERENCES:
patent: 2198635 (1940-04-01), Rossman
patent: 2338533 (1944-01-01), Pash
patent: 2506151 (1950-05-01), Hoven et al.
patent: 2569354 (1951-09-01), Tracy
patent: 4248103 (1981-02-01), Halsall
patent: 4651589 (1987-03-01), Lambert

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