Elevation protractor for trunnioned guns
Patent 4455918 Issued on June 26, 1984. Estimated Expiration Date: 
June 10, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 10, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesProtractor with digital readout Novel technique for spot position measurement Surveillance and weapon system Patent #: 4112818 InventorAssigneeApplicationNo. 06/387055 filed on 06/10/1982US Classes:89/41.02, Motor operated33/1PT, Angular position transducer33/707OpticalExaminersPrimary: Kelly, Donald G.Attorney, Agent or FirmInternational ClassesF41G 3/00 (20060101)F41G 3/32 (20060101) F41G 5/00 (20060101) Foreign Application Priority Data1981-06-15 GBAbstractA protractor for determining the elevation angle of a gun by direct measurement of the included angle between a first radius of a trunnionand 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. | |
