US1252383A - Photographic-dark-room lamp. - Google Patents

Description

F. W. BARNES & G. F. PHILLIPS.

PHOTOGRAPHIC DARK ROOM LAMP.

APPLICATION HLED JAN. 8,1917- Patented Jan. 8, 1918;

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UNITED STATES PATENT OFFICE.

FREDERICK W. BARNES AND GEORGE E. PHILLIPS, OF ROCHESTER, NEW YORK,

ASSIGNORS '10 EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, COR- PORATION OF NEW YORK.

PHOTOGRAPHIC-DARK-ROOM LAMP.

Specification of Letters Patent.

Application filed January 8, 1917. Serial No. 141,202.

To all whom it may concern:

Be it known that we, FREDERICK W. BARNES and GEORGE F. Pnmurs, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic- Dark-Room Lamps; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying. drawings, forming a part of this specification, and to the reference-numerals thereon.

Our present invention relates to photography, and more particularly to photographic dark room lamps, and has for an object to provide a compact, economical, simple and efiicient, portable electric lamp for general amateur use, having a permanently attached socket and plug member.

which may be screwed, without extra .attachments, or any manipulationof the contained electric bulb, directly into any convenient wall bracket or drop cord electric socket, so that it may be used in an position, although preferably suspends vertically; and to provide an improved arrangement and simple construction of easing, windows and their retaining members and light protective means, which permit easy removal and assemblage'of selected filter elements, but prevent escape of undesired actinic light from the lamp during useof the device, while furnishing an eflicient source of general illumination for the dark room and a dim safe light for the work bench.

To this. and other objects, which are apparent from the following disclosure, the invention consists in certain improvements and combination of parts, all as will be hereinafter more fully described, its novel features being pointed out in the claims at the end of the specification.

In the drawings: Figure 1 is a perspective of the dark room lamp.

Fig. 2 is a plan view of the bottom window and the retaining device therefor, detached from the casing.

Fig. 3 is an enlarged bottom plan view, with the circular window in place.

Fig. 4 is a vertical section through the lamp, the front window being partially withdrawn andthe bottom Window and its locking-member removed from their normal positions.

Fig. 5 is a section taken on the line AA of Fig. 3, illustrating the construction of the bottom window and frame.

Fig. 6 is an enlarged vertical section showing 'the construction of the hinge for the light locking cap over the large window. Similar reference numerals throughout the several figures indicate the same parts.

As a practical embodiment of our invention, we provide a lamp casing 1, formed of suitable sheet material, such as metal, bent into an exaggerated semi-cylindrical shape, the curved portion of the casing forming a reflector 2 and the flat portion serving to hold a large rectangularly shaped window 3, the reflector and the window combining to throw the bulk of the light into the room for general illumination. Fastened to the top4 there is an electric plug and socket attachment 5 permitting quick connection with an electrical fixture without unassembling the dark room lamp, and in the window-end of top 4 an' aperture 6, having a light proof door 7 thereover,.is provided for insertion of the front window into the casing, actinic light being prevented from leaking between the window and the frame by the special construction hereinafter described. The bottom 8 carries a removable circular window 9 constituting a light filter adapted to transmit a dim safe light downwardly to a Work bench and photographic material being treated thereon.

The plug and socket attachment 5, comprises a metal casing 10 screw threaded on its outer end 11 for attachment to an electrical fixture, and screw threaded on its inner end 12 to form a socket for insertion ofan electric bulb 13. Concentric within the casing 10 and separated therefrom by insulation 14, extending from the upper end of casing 10 to the inner screw threaded part 12, is a conductor or post 15 projecting outwardly to constitute a terminal to cooperate with the plug part 11 and projecting slightly into the screw threaded socket 12 to cooperate with the latter to carry the current to the lamp. This plug and socket attachment 5 is permanently fixed to the top 4 of the casing-1, by means of an insulating tube 16 engaging the casing of the fixture 5, around which a collar 17, L shaped in cross sectlon is pressed or crimped, the flange of this collar 17 being fastened to the top 4 by solder or other suitable means.

The two window filters 3 and 9 comprise one or more layers, 18 and 19 (see Fig. 5) of light transmitting material, such as film base, paper, cloth or the like, between two panes of glass 20 and 21, the layers 18 and 19 being suitably colored in the preferred embodiment of the invention, so that their added color values rovide a safe efiicient light that will not a ect protographic material subjected thereto. It, of course, is clear that various types of filter construction, such as a single piece of glass or other translucent material having the desired light transmittin or restraining qualities, may be used.

1% order that window 3 may be removed,

slideways are provided on opposite sides of the window, these being formed by flan es 22 and 23 projecting inwardly on either side of the casing 1, and flanges 24 and 25 on the bottom, thereby holding the window in place and preventing escape of light around its side and bottom edges. Flanges 26 and 27 projecting downwardly from the top 4 and cooperating with the casing walls provide sides to an aperture through which the window 3 may be removed. To prevent light leaking between the window and the flanges 26 and 27, and to prevent accidental removal of the window, a light proof door 7 is hinged along the forward edgeof the top 4 of the lamp casing and is adapted to lie flat on the top of the casing over the upper edge of the wmdow. The hinge for the door 7 comprises a central portion 28 of flange 26 bent in a circular form to receive the hinge pin 29, (Figs. 1 and 6) and the portions 30 of door 7 similarly bent (as shown in dotted lines in Fig. 6) to form the outer ends of the hinge to retain pin 29. The intermediate portion 31 of door 7 is curved downwardly for approximately a quarter of a turn over all that part 28 of flange 26 which is turned about pin 29, this part 31 rotating about part 28 when door 7 is raised and at all timesl forming a flange serving to prevent light escaping through the central portion of the hinge. The ends 32 of the door 7 are bent down to fit over the edge of lamp casing 1. This construction of door 7 permits easy access to window 3 for removing or changing the same and serves to hold the window in place when the lamp is reversed, and at the same time provides an adequate light protector preventing undesired light escapmgrfrom the casing when the lamp is used.

he disk shaped window, 9 in the bottom of the casing is removably held in place between an annular locking member 33 fitting within a circular opening in the bottom 8 and an annular flange 34 on the inside of the casing, the window being slightly lar er than the opening in the casing bottom. he annular member 33 is substantially L shaped in cross section and has lateral flanges 35 projecting over the window to keep it from falling out, and in turn is fastened to the casing by means of laterally projecting cars 36 spaced around its periphery and slidably cooperating with the bottom of the casing to form a sort of bayonet joint. Cut out portions or recesses 37 in the bottom 8 are spaced similarly with the cars 36 around the window aperture, so that the ring 33 may be positioned with ears 36 in the recesses 37 and rotated to move the ears 36 behind the casing bottom, thereby holding the ring 33 and the filter in place. The flange 34 is in the form of a ring, having its inner diameter somewhat less than the filter 9, and is resiliently mounted with another annular member 38, which has a downwardly extendin flange 39 on its inner periphery, to hold fi ter 9.in place, the flange 34 being fastened at its outer periphery to the inner side of bottom 8 of the casin v In assemblmg the bottom window, the lamp casing l is held bottom up and window 9 placed in the annular flange formed by members 34 and 38. Ears 36 of locking frame 33 are located in the corresponding openings 37 in the bottom 8 and rotated, at the same time being pressed downwardly. The resilient member 34 allows the ears 36 to be held firmly between the bottom 8 and the flange of annular ring 33, thereby clamping the window 9 between member 33 and 34. A struck up protuberance 40 forms a stop for one of the ears 36, preventing member 33 from being rotated too far and thereby accidentally unlocking and releasin window 9. It can readily be seen that thls .forms an efiicient light proof door which can be operated easily and quickly in the dark'if necessary. I

This combination makes a simple portable lamp, which may be screwed directly into any convenient electric lamp socket without opening the lamp, or changing the fixtures in any way. It is as-convenient to handle as a single electric bulb, as none of the adjustments to the lamp and casing hitherto necessary in dark room lamps are required.

We claim:

1. A portable dark room lamp comprising a non-actinic casing, an electrical fixture for an electric bulb, said casing having an opening in a wall for a filter window and recesses adjacent said opening, and a rotatable annular member to hold a window slightly larger than said opening, between said casing and member, said member having integral locking lugs insertible into said recessesand rotatable behind said casing wall to malntain the parts in assembled relation.

2. A dark room lamp comprising a nonactinic casing apertured for a window, slideways on opposite sides of the aperture to hold said window, said casing having an opening through a wall adjacent one end of said slideways for removal and insertion of said window, and a hinged cap movable over said opening to prevent transmission of light around said windows through the opening to the exterior of the casing, the hinge for the cap comprising two end lugs on the cap bent to surround a hinge pintle extending therebetween, said pintle being fixed to the casing by a projecting flange on the latter extending between the hinge lugs on the cap and bent around the pintle, thereby preventing light escaping beneath .the hinge pintle, said cap having a flange projecting forwardly and curved downwardly over the pintle and adapted to move around the same when the cap is moved, and prevent light escaping between the cap and pintle.

3. A unitary photographic dark room lamp comprising a casing having an interior reflecting surface, two filter windows, a large one opposite said reflecting surface to transmit the major portion of the light for general illumination of a room and a small one beneath the bulb and out of line with the rays from said reflector and adapted to transmit a dim light to a work bench, an electrical fixture insulated from said casing and rigidly attached thereto, said fixture having an exterior plug adapted to be screwed into an electric light socket, and an interiorly located socket to hold an electric bulb, said casing having slideways and an opening through a wall at one end of said slideways for removal and insertion of the larger window, a light proof hinged cap over said opening to prevent undesired light escaping around the window to the exterior of the casing and aretaining member removably holding the small window in place.

In testimony whereof, we aflix our signatures in the presence of two witnesses this 45 day of J any., 1917.

FREDERICK W. BARNES. GEORGE F. PHILLIPS. Witnesses:

K. E. GRAGION, E. G. MEYER.

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