Multi-section helicopter-borne rotatable beam, specially adapted to support range-finder cameras and television focusing cameras for stereophotogrammetric surveys

Abstract From the Canadian patent

A multi-section helicopter-borne rotatable beam for supporting at either of its ends range-finder cameras and television focusing cameras for stereophotogrammetric surveys, in which the central tubular section is rotated by means of an electric motor and return springs and supported by two collars mounted rotatably by means of hinged constraints on a base fixed rigidly to the floor of the helicopter cab and the two truncated-cone tubular-structure side sections of the beam are secured to the said central section by a telescopic coupling arrangement ensured by half-ring ties co-operating with flanges of the said sections and by through pins and safety split pins; the -2-, above-mentioned …