US1715884A - Dark-room safe light - Google Patents

Description

June 4, 1929. w, ALLEN 1,715.884

DARK ROOM SAFE LIGHT Filed March 19, 1928 2. Sheets-Sheet June 4, 1929. w, ALLEN I 1,715,884

DARK ROOM SAFE LIGHT Filed March 19, 1928 2 Sheets-Sheet 2 Patented June 4, 1929.

UNITED STATES WALTER ALLEN, OF WHIT'IIER, CALIFORNIA.

DARK-ROOM SAFE LIGHT;

Application filed March 19, 1928.

This invention aims to provide a photographic dark room lantern so constructed that a flexible shiftable screen may be used conveniently, the screen including a plurality of sections of different colors, means being provided for moving the screen so that the difi'erently colored sections of it may be brought into position one at a time, as required by the operator.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

With the above and other objects in View, '5 which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings Figure 1 shows in front elevation, a device constructed in accordance with the invention, parts being broken away;

Figure 2 is a transverse section, parts being broken away;

Figure 3 is a vertical section;

Figure 4 is a fragmental side elevation dis- 6 closing one of the brakes;

Figure 5 is a plan showing a portion of the screen.

forms the subject matter of this application comprises a casing 1, including an upper front plate 2, a bottom 3, ends 4 and 5, a top 6, a

back 7, and a curved member 8 joining the top and the back.

The numeral 9 marks a panel, and a transparent pane 10, preferably made of glass, carried by the panel. The bottom 3 has a socket 11 in which the lower edge of the panel 9 is received, as shown in Figure 3, and the upper edge of the panel 9, is held in overlapped relation on the front plate 2, by means of a button 12 which is pivoted to the front plate. The pane 10 is seated in an offset 14 on a panel 9 and is held in the offset by means of a backing frame 15 which is secured to the panel 9.

A trough-shaped upper roller housing 16 is provided and has ends 26, shown in Figure 1, the ends 26 of the upper roller housing being secured to the ends 4 and 5 of the casing The photographic dark room lantern which Serial N0. 262,693.

1. The upper edge 17 of the roller housing 16 is connected to the upper front plate 2, and the lower edge 18 of the roller housing is spaced horizontally from the pane 10. An inverted L-shaped lower roller housing 19 is provided, and is connected. like the upper roller housing 16, to the ends 4 and 5 of the casing 1. The lower edge 20 of the lower roller housing 19 is connected to the bottom 3, and the upper edge 21 of the lower roller housing is spaced horizontally from the pane 10. A reenforcing plate 22 is extended between and connected to the ends 4'5, the upper edge of the reenforcing plate 22 being connected to the lower edge 18 of the upper roller housing 16, and the lower edge of the reenforcing plate 22 being connected to the upper edge 21 of the lower roller housing 19. The reenforcing plate 22 has an opening 23 of approximately the same area as the pane 10, the said opening being located immediately behind the pane.

Rollers 24 are mounted for rotation in the roller housings 19 and 16. Specifically, the rollers 24 have reduced ends 25 which are journaled in the ends 4 of the casing 1, and in the ends 26 of the casing 1. The reduced ends of the rollers 24 which extend through the part 5 of the casing 1, carry knobs 27, or the like, whereby the rollers may be rotated readily. Toothed wheels 28 are secured to the ends of the rollers 24, externally of the rollers 24, externally of the casing 1, and are located in close relation to the knobs 27.

The numeral 29 designates spring arms which are secured at 31 to the end 5 of the casing 1, the arms 29 having projections 30 which engage with the teeth of the wheels 28. The teeth of the wheels 28 and the projection 30 are so shaped that when forcible rotation is imparted to the rollers 24, by means of theknobs 27, the rollers can be turned, but, ordinarily, the spring arms 29, and the projections 30 cooperate with the toothed wheels 29 to hold the rollers 24 against rotation.

The numeral 32 designates a translucent screen which may be made of treated linen, or any other suitable flexible material. The ends of the screen 32 are secured to the rollers 24, and the screen extends between the pane 10 and the reenforcing plate 22. The screen 32 is made up of a plurality of sections 33, 34, 35, 36, 37, and 38, arranged end to end and of different colors. The screen section 33 may be dark red, the section 34; may be green, and the section 35 may be white. It is suggested that the section 36 may be yellow, the section 37 light red, and the section 38 amber. The area of each of the sections 33--38 is greater than the area of the opening 23 in the plate 22, and greater than the area of the pane 10, so that there will be no danger of light leakage. In the end 5 of the casing 1 there is a socket 50 adapted to hold an electric lamp 51 which is located in the upper part of the casing 1, behind the front plate 2. The part 8 of the casing serves as a reflector which directs the ray from the lamp 51 downwardly through the opening 23 in the plate 22, through the selected section of the screen 32, and through the transparent pane 10. i

It is obvious that by turning the rollers through the instrumentality of the knobs 27, the screen 32 can be moved, lengthwise so as to bring any selected section of the screen in place behind the pane 10, thereby to give the preferred hue to the light rays. The brake mechanism 29-30-28 holds the rollers 24 against rotation and keeps the screen 32 taut without interfering with the forcible rotation of the rollers to shift the screen longitudinally.

edge of the upper roller housing, the lower edge of the reinforcing plate being connected to the upper edge of the lower roller housing, the reinforcing plate having an opening located between the roller housings, a panel closing the forward sides of the roller housings, a transparent pane carried by the panel, means for holding the panel in place removably between the bottom and the front plate, rollers mounted for rotation in the roller housings, a flexible screen wound around the rollers and extended between the pane and the reinforcing plate, and means for illuminating the casing.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature.

WALTER ALLEN.

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