Stable plumb beam optical projector

Details Stable plumb beam optical projector Stable plumb beam optical projector

1983-08-15

1985-05-21

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

With damper or governor for sensor

33275R, 33391, 33402, 33397, 33286, G01C 915

Patent

active

045177490

ABSTRACT:
A viscous dampened sensitive pendulum carries a generally upwardly directed light source for indicating the gravity vertical. The sensitive pendulum is carried for two degrees of pivotal freedom by flexural pivots which are biased for operation at an error free or hysteresis free zero spring rate for small pivotal deflections. A drive pendulum coupled through the flexural pivots to the sensitive pendulum maintains a small pivotal deflection so that error free, zero spring rate, operation is achieved.

REFERENCES:
patent: 369750 (1887-09-01), Spranger
patent: 585850 (1897-07-01), Patrick
patent: 2503422 (1950-04-01), Silverman et al.
patent: 2517295 (1950-08-01), Esher
patent: 2843001 (1958-07-01), Werner
patent: 3014283 (1961-12-01), Hofmann
patent: 3505739 (1970-04-01), Abrams
patent: 3555691 (1971-01-01), Jacoby
patent: 3911588 (1975-10-01), Ohneda
patent: 3983636 (1976-10-01), Fashbaugh et al.
patent: 4206550 (1980-06-01), Boyett et al.

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