US 1759307 A
Description (OCR text may contain errors)
M m-1930. Hi'nA TmER 1, 5 92 01 BELL SHAPED REFLECTOR FOR ILLUMINA'IING' SHOW WINDOWS Filed June 28, 1927 Patented May 2 0, 1930 Hans HARTINGER, F JENA, GERMANY, ASSIGNORQBY MESNE ASSIGNMENTS, "r0 ZEISS IKON A-G., or BERLIN, GERMANY BELL-SHAPED BEFLECTOB FOR ILLUMINATING SHOW WINDOWS Application filed .Tune 28, 1927, Serial No. 202,147, and in Germany June 30, 1926.
Reflectors for illuminating show-windows and the like, made of a glass bell, silvered outside and consisting of waves or zones graduated relatively to each other, whose light exit-aperture forms a. surface disposed at an oblique angleto the neck of the bell, have, owing to the shape chosen, hitherto only been made by means of pressing.
Pressed glass, however, is not very well suit- 10 ed for reflectors since the surface of the reflectors made in this manner shows many undesirable irregularities. Reflectors made of blown glass bells, however, are far better suited for the above purpose. Moreover,
owing to the possibility of using much thinne'r glass walls the latter reflectors mean a great saving in weight and material as compared with pressed reflectors and they also have a higher resistance to the changes of temperature.
The subject of the invention is a reflector of the aforesaid kind, having the advantages of blown reflectors. This improvement is attained by choosing the bell-shape according to the invention in such a way that the glass bell (together with the waves or zones) forms a part of the body of revolution whose axis coincides withthat the neck of the bell.
Such aselection of the bell-shape affords the manufacture of the reflectors by blowing; by continuous rotations during the blowing process. in a form corresponding to the profile of the bell the irregularities of the surface are compensated and the bells are in particular exempt from press seams which otherwise always exist. The'new reflector admits of focussing the glow lamps, used as a source of light whose current supply main is, as usual, to be introduced through the 59 disposed at an oblique angle relatively to the axis of rotation, i. e. a surface produced by the displacement of a straight line along an optional guide curve. If the latter be itself a straight line, the practically simplest case holds good that the light exit-surface of thet reflector is a plane.
The annexed drawing shows a constructional example of the invention. Fig. 1 shows the shape of the blown glass body in a longitudinal section; Fig. 2 diagrammatia-ggo cally represents in a longitudinal section on a reduced scale the finished reflector when used for illuminating a show-window.
The glass body silvered outside is a body of revolution'provided with zones a a a e graduated relatively to each other. Its axis of rotation b coincides with the axis of the neck of the bell. The light exit-surface g is a plane inclined at an angle of 45 to the axis of rotation 5. Another suitable forn1 'T-70 of the light exit-surface is obtained by cutting off the glass body by a cylindrical surface whose guide curve 7 is shown in the drawing by dot and dash lines and whose surface lines are perpendicular to the drawing -r7 plane. a
The fitting of a finished reflector i with glow lamp is, used as a source of light, in a show-room m closed by a window pane Z takes place in the manner illustrated in Fig.2a2180 2, the illuminating body being fixed at the ceiling of the show-room near the pane Z. The reflector i must in this case be brought by rotation about its axis of rotation into such a position that onlookers, standingini'z'vss front of the pane Z, cannot be dazzled but that both the floor and the back wall of the show-room m are struck by the light.
'1. Reflector consisting of a glass bell sil vered out-side, containing a neck adapted to receive a holding device, the glass bell being provided with waves or zones graduated relatively to each other and forming together with the waves or zones a part of a bodyof 9 revolution whose axis coincides with the axis of the said neck and the margin of the bell lying on a surface, substantially inclined at an oblique angle to the said axis.
2. Reflector consisting of a glass bell sil 'vered outside, containing a neck adapted to I receive a holding device, the, glass bell being provided with waves or zones graduated relatively to each other and forming together with the Waves or zones 2 part of a body of revolution Whose axis'coincides with the axis of the saidne'ok and the margin of the bell lying on a plane, inclined atan oblique angle to the said axis.
i1 7 HANS HARTINGER.