Measuring and testing – Instrument mechanism or transmission
Patent
1986-08-14
1988-04-12
Noland, Tom
Measuring and testing
Instrument mechanism or transmission
74DIG7, G01B 1300
Patent
active
047366400
ABSTRACT:
A compact, six-degree-of-freedom motion detecting system includes a hollow spherical motion input member adapted to be grasped by an operator, and a decoupling cube disposed within the motion input member and restrained against appreciable motion by a support shaft extending into the motion input member and secured at its opposite ends to the cube and a rigid base. Six translational motion sensors, each spaced outwardly from one of the cube side surfaces, are disposed within the motion input member and movably mounted on the cube by a support rod system. Each of the sensors includes a central longitudinal section of one of six flexible, fluid-filled tubes, the opposite end portions of each tube being extended outwardly through the motion input member and operatively connected to the inlets of one of six differential pressure transducers. The motion input member is supported for translation and rotation relative to the cube, and with respect to three mutually perpendicular reference axes thereof, by means of six balls, each of which is movably carried in an internally tracked portion of the motion input member and pinches shut one of the central longitudinal tube sections. Operator movement of the input member causes various of the balls to roll along the central tube sections, pinching them shut in altered locations thereon and creating pressure differentials in the tubes which are sensed by the transducers. The transducer outputs are transmitted to a suitable signal processor which responsively generates signals indicative of the magnitude and sense of translation and rotation of the motion input member relative to each of the three cube reference axes.
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