Richard A May

US Patent:

41095332, Aug 29, 1978

Filed:

Dec 27, 1976

Appl. No.:

5/754401

Inventors:

Richard J. Broadman - W. Simsbury CT
Richard D. May - Weston CT

Assignee:

Jones Instrument Corporation - Stanford CT

International Classification:

G01P 318

US Classification:

73498

Abstract:

Apparatus for deflecting a pointer in proportion to the rotational speed of a shaft comprises a support, a governor mounted on the support, an indicator mounted on the support and an angled calibrating lever pivotally mounted on the support and connecting the governor to the indicator. The governor includes an input member adapted to be operably connected to the shaft for rotation therewith and an output member movable in a given direction (typically parallel to the axis of shaft rotation) to a degree generally related to the rotational speed of the shaft. The indicator includes a drum, a pointer operably connected to the drum for movement therewith, and a flexible member at least partially wound about the drum so that the drum is rotated by the unwinding of the flexible member therefrom. The angled calibrating lever has one leg bearing against the output member for motion therewith and the other leg secured to a portion of the flexible member for unwinding the flexible member from the drum. In order that the deflection of the pointer be in close proportion to the rotational speed of the shaft, means are provided for compensating for the deviation from proportionality of the degree of movement of the output member to the rotational speed of the shaft.