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US 4,351,197 AGranted
Precision positioning apparatus having a rotating driving element and a rotating driven element
OwnerDonald G. Carsoninventor
Life of this patent
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Abstract
Precision positioning apparatus includes a rotatable driving element connected to a rotatable driven element having a diameter substantially greater than that of the driven element, and rotary movement of the driving element imparts rotary movement to the driven element. The diameters of the two elements are related so that a relatively large movement of the driving element results in a relatively small movement of the driven element, and vice versa.
Claims15
Positioning apparatus, comprising, in combination:
- driven means to be positioned, including a drum journaled for rotation and having a plurality of grooves extending circumferentially about the drum;
- drive means for moving the driven means, including
- a screw,
- a plurality of helical threads on the screw, the pitch of which is directly related to the spacing of the grooves on the drum, and
- means for rotating the screw to position the drum;
- and
- means for coupling the screw to the drum, including a cable having two ends secured to the drum and extending in the grooves of the drum and in the threads of the screw for rotating the drum in response to rotation of the screw.
4 more elements
Positioning apparatus, comprising, in combination:
- base means;
- screw means, including a screw secured to and journaled for rotation in the base means and movable vertically upwardly and downwardly relative to the base means as the screw rotates;
- helically extending threads on the screw having a predetermined pitch;
- a cylindrical drum secured to and journaled for rotation on the base means and disposed adjacent to the screw;
- a plurality of grooves extending circumferentially about the drum and spaced apart from each other a predetermined distance;
- cable means, including a cable secured to the drum and disposed in the grooves of the drum and in the threads of the screw in a predetermined manner whereby the drum is coupled to the screw for rotation of the drum to position the drum as the screw rotates.
3 more elements
Dependencies are inferred from the claim text.