Elevation protractor for trunnioned guns

Details Elevation protractor for trunnioned guns Elevation protractor for trunnioned guns

1982-06-10

1984-06-26

Kelly, Donald G.

Ordnance

Mounts

Training mechanisms

33 1PT, 33125C, 89 41ME, 89 41TV, F41C 900, F41H 1300, G01B 330

Patent

active

044559186

ABSTRACT:
A protractor for determining the elevation angle of a gun by direct measurement of the included angle between a first radius of a trunnion
and a second radius of an associated trunnion bearing, includes a linearly extensible measuring device with digital output, pivotally attached to the trunnion and to the bearing at predetermined distances along the respective radii so as to extend between them as the subtense of the included angle, and a digital processor for deriving a measurement of the included angle from the subtense measurement provided by the measuring device. The digital processor provides an output which is particularly suitable for application to a fire control system, the measurements provided by the protractor being less sensitive to centering inaccuracies in the trunnion and its bearing than conventional angle transducers operating at a subsidiary bearing.

REFERENCES:
patent: 3996670 (1976-12-01), Joyal
patent: 4025197 (1977-05-01), Thompson
patent: 4112818 (1978-09-01), Garehime

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