Flash box

Jan. 15, 1935.

1,987,705

T. W. PEDERSEN

FLASH BOX Filed Feb. 6, 1934

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Patented Jan. 15, 1935

1,987,705

UNITED STATES PATENT OFFICE

1,987,705

FLASH BOX Thomas W. Pedersen, Montclair, N. J. Application February 6, 1934, Serial No. 709,933 3 Claims. (CI. 240—103) circular wall 13, these forming an inwardly displaced annular seat.

The socket 14, in which the lamp is mounted harries an outstanding circular flange 15, of slightly less diameter than the circular wall 13, 5 and of a thickness approximating the depth of the inset. Consequently, this flange will rest in the inset seat approximately flush with the outer surface of the back wall.

For removably securing the socket flange in io its seat in the back wall of the box, there are provided in the illustration, two diametrically opposite lugs 16, supported on the outer face of the back wall, extending radially inwardly over the flange of the seat and to get by these lugs, the 15 flange is notched in its opposite edges as at 17. By making these lugs of less extent than the width of the seat flange 10, the notches 17, in the socket flange need not be cut so deep as the width of the seat flange, to thereby leave a light excluding 20 overlap in all positions of the socket flange on the seat flange, as indicated in Fig. 2.

The holding lugs 16 may be simply short pieces of flat strip material welded or otherwise secured to the back wall in position projecting over the 25 edges of the seat. It is possible also that these securing lugs may be integral parts of the box wall as indicated at 16α in Fig. 4, where such lugs are simply parts of the box wall left standing in the original plane of such wall when the 30 seat flange is depressed, such flange being interrupted at the points 12α, where these keys are left attached in the original plane of the back wall.

The socket attached flange 15 is indicated as 35 a circular flat plate and this may be attached to the socket in various ways. In the illustration, the socket is of the separable type, such as used on electric signs and comprising a base piece 18, carrying the screw contact 19, and a front piece 40 in the form of a collar 20, which screws over the shell contact. This front screw piece has a flange 21, which enters in the back or base piece and as shown in Fig. 3, the mounting flange 15, may be passed over this flange 21, and clamped 45 between opposing portions of the front and back pieces of the socket. This combination enables quick application of the flanges to the sockets and the ready substitution of different kinds of flanges and sockets. 50

The invention adds but little to the expense of the box structure and adds no bulk to the box. The flange or disc-like member which carries the socket overlaps the depressed flange in the back of the box sufficiently to exclude objectionable 55

This invention relates to electric advertising and display devices of the type known as flash boxes, in which pictorial or other matter on a screen is intermittently illuminated by an electric 5 lamp in a reflecting box at the back of the screen.

These boxes are usually light tight, to throw all the light out through the screen and so as not to cast light backward, which would be objectionable in certain cases, as for example, when these boxes 10 are used in display windows.

The closing in of the lamps in this way frequently produces over-heating and burning out of the lamp filaments and heretofore it has been necessary to remove the box from the back of the 15 frame carrying the screen or transparency to effect replacement of lamps.

The objects of this invention are to enable quick replacement and changing of lamps without haying to take the box apart and to accomplish this 20 with a simple and inexpensive construction, which will not appreciably increase the cost of the structure.

These objects are attained by the novel features of construction, combinations and rela25 tions of parts hereinafter described, illustrated and broadly claimed.

The accompanying drawing illustrates simple practical embodiments of the invention, it being understood that the actual physical form may be 30 modified and changed within the true intent and scope of the invention.

Fig. 1 is a perspective view illustrating one of the new light boxes and showing the lamp unit bodily removed as a separate unit.

Fig. 2 is a broken rear view with the removable lamp unit in position in the box.

Fig. 3 is a broken vertical sectional view as on substantially the plane of line 3—3 of Fig. 2.

Fig. 4 is a broken sectional detail of a modified ⁴® form of mounting seat for the removable lamp unit.

In the illustration, the complete box consists of a frame 5, of wood or the like, carrying a screen ._ or transparency 6, and to the back of which there is attached as by nails, screws or other suitable fastenings 7, a reflecting light enclosure 8 of truncated pyramidal form. This light enclosure may be of sheet metal, painted or otherwise interiorly 50 finished to reflect the light forwardly through the screen. The back wall 9, of the light enclosure is made with an opening 10, large enough to pass the lamp globe 11, which is to be used in the box. About such opening, the back wall is inset to 55 provide an inwardly displaced flange 12 and

1,987,705 light at the back and this mounting flange may have a bright finish where it is exposed within the box, so as to form part of the internal reflecting surface of the box.