Patent GB-190423603-A (GB)
Title: Improvements in or relating to Optical Appliances, such as Picture Viewers, Stereoscopes, Eye-protectors, Motor Goggles, Eye-testing Appliances, Reducing Appliances and the like.
Inventor: BARNES EDWIN
Filed: 1904-11-01
Granted: 1905-07-20
Abstract: 23,603. Barnes, E Nov 1 Eye-protectors &c.-The frames of picture - viewers, stereoscopes, eye-protectors, motor goggles, eyetesting appliances, reducing-appliances and the like are made of one or two pieces of sheet metal cut and bent to form two tubes which fit closely to the face and exclude side lights. To form a picture-viewer or stereoscope, a portion of a sheet of metal, Fig. 1, is cut away along the lines a b, and the corners are also removed by straight cuts c d. The two ends are bent round and the projecting parts A. overlap and are secured by soldering, riveting, &c., as shown in Fig. 3. The joint may be strengthened by securing one or more strips, or a bent strip E, Fig. 5, over the overlapping portions A and the central straight portion of the sheet. Eye protectors, spectacles, and goggles are made in a similar manner, but with short tubes, Figs. 8 and 9, and the corners are not cut off as at c d, Fig. 1. A projection F is left on one side or on each side of the central portion, and is bent at right-angles and riveted to the overlapping portions A and a plate F', as shown in Fig. 11. The devices may be also constructed of two pieces, as in Figs. 12 and 17, with overlapping portions H. In the picture-viewer or stereoscope frame, Figs. 12 and 13, the projections A are preferably bent over and turned inwards, and the tubes are hinged together by a pin J passing through the extensions H. A locking-stay is provided, a convenient form consisting of a strip K, Fig. 15, on each side of the pin. Both strips are secured at one end to the pin J and at the other end to a rivet or pin K<1> passing through a hole in one extension and through a radial slot in the other extension, so that the motion is limited. Or the tubes may be hinged so as to turn about an axis parallel to their length by suitably bending the extensions H. In the short tubes. Figs. 17 and 18, the projections A are bent round and overlap the parts H, and the tubes are hinged by a pin J, Fig. 20, passing through washers J<1> and the overlapping portions. The part H<1>, which is an enlargement of the part H and may be fixed or detachable, forms a hood to protect the glass or lenses when the device is used as goggles or eye-protectors, and it is stated that the tubes automatically adjust themselves to the face of the wearer. The longer tubes may be used as picture-viewers, or, by providing grooves G for strengthening and for holding lenses, as stereoscopes. Spectacle frames L, Fig. 7, or separate lenses may be held to the centre of the tubes or to each tube by a clip L', L<2>, which clasps the straight portion at the slot B, Fig. 1. A fixed or sliding frame may be added to the device to hold pictures to be viewed. Slots M, Fig. 2, may be made in any of the tubes, either along the grooves G or not, and, by means of these slots, lenses may be inserted or withdrawn, and the apparatus may be used for testing eyes by using different lenses. Or the device may be converted into reading-appliances, or into a " reducing-appliance." The curved parts a b may be covered with velvet or other material to protect the face, and elastic, tape, spectacle sides, or other means may be employed for holding the tubes to the face. Recesses or slots may be provided in the tubes to allow the use of spectacles, and the tubes may be curved so as to fit oval or elliptical lenses.