GB516185A - Improvements in and relating to the adjustment of aircraft cameras - Google Patents

Abstract

516,185. Aeronautical cameras. WILLIAMSON, S., and WILLIAMSON MANUFACTURING CO., Ltd. July 7, 1938, No. 20153. [Class 40 (i)] The adjustment of an aircraft camera is effected through servo-mechanism controlled by the adjustment of an associated instrument, e.g., a gyroscopic device or a manually - controlled ground speed indicator or view-finder. The lens cone of the camera may be secured in a ring 7 resting on ball-bearings 8 in a frame 5 tiltably mounted on trunnions 6 supported by a frame 3 itself mounted on trunnions 4 carried by a frame 1 secured to the aircraft by bolts 2. The frames 3, 5 are tiltable about their trunnions by screws 14, 17 respectively engaging nuts 15, 18 pivoted to the frames and actuated through gearing from reversible electric motors 10, 16 mounted respectively on the fixed frame 1 and the frame 3, the supply of current to the motors being controlled by pairs of switches 26 carried by the frames 3, 5 and operated by Bowden wires 22, 23 connected to the associated instrument which may be mounted in the same manner as the camera. The wire 22 operates lever 24, Fig. 4, pivoted on trunnion 4 of the frame 3 and having a rounded outer end adapted to engage either of. the press-buttons 27 of the switches 26 mounted on the frame according the tilting action required. The wire 23 operates a similar lever 25 on the frame 5. Since the switches move with the frames, the press-buttons ride off the levers after the requisite tilting has been affected. As the mounting ring 7 is adjustable through a considerable angle, the simple lever switch device used with the frames 3, 5 is replaced by a differential gear mechanism, wherein a cam disc 28 mounted between the switches 26a is rotated by one member of the gear, the mounting ring 7 is geared to a second member, and the B.owden wire 36 rotates the third.