Improvements in or connected with prismatic binoculars

Abstract

Abstract 435,220. Binoculars. BARR & STROUD, Ltd., and STRANG, J. M., Caxton Street, Anniesland, Glasgow. Aug. 9, 1934, No. 23023. [Class 97 (i)] Prismatic binoculars in which the objectives are at a greater distance apart than the eyepieces are provided with one or more heads for movement of parts within the casing, the heads being situated in the region of the face of the prism housing so as to be conveniently operated by the fingers when the binoculars are in use. The parts to be moved by the heads may be light filters, lenses for focusing &c. In Fig. 1 a rotatable head A is mounted on the prism housing B and is provided with a pinion 2 meshing with a pinion 3 on a disc C having a number of apertures, one of which is clear and the others are provided with light filters. Instead of a single disc a number of coaxial discs may be provided, and a single rotatable head may be mounted so as to be movable axially to engage any one of the discs, or a separate head may be provided for each disc. Instead of being rotatable, the head may be movable rectilinearly, a rack formed on its stem engaging a pinion on the disc. In Fig. 8 a number of lenses E, E<1>, E<2> for focusing purposes are mounted on pivoted arms 9 and are adapted to be selectively moved into operative position by tappets 13 secured to a rotatable head. Each arm 9 is provided with a return spring 12. In Fig. 12 a lens E<5> which is permanently in the path of the light rays is movable axially for focusing by the rotatable head A' having a screwed stem 16.

Inventors

No inventors recorded.

Bibliographic Details