US2282570A

US2282570A - Film developing apparatus

Info

Publication number: US2282570A
Application number: US346854A
Authority: US
Inventors: Golden Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-07-22
Filing date: 1940-07-22
Publication date: 1942-05-12
Anticipated expiration: 1959-05-12

Description

May 12, 1942.'

L. GOLDEN FILM DEVELOPING APPARATUS Filed July 22, 1940 ATTORNEYS hun NNI Patented May 12, 1942 UNITED STATES ATENT QFFICE 3 Claims.

The present invention relates to an improved apparatus for developing films, either roll or motion picture.

The primary object of the invention is to provide a receptacle for containing the developing solution and means in conjunction therewith for rapidly loading and unloading the film to be subjected to the developing solution in the receptacle.

A further object of the invention is to provide an apparatus of this character embodying means for governing the temperature of the developing solution.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a front elevational view partly in vertical section of the apparatus.

Figure 2 is a horizontal sectional view taken substantially on line 2 2 of Figure 1.

Referring to the drawing for a more detailed description thereof, there is disclosed an outer cylindrical-shaped receptacle 5 adapted to contain a developing solution, washing solution or fixing solution as employed in the developing of lms. The receptacle 5 is preferably formed of a relatively light sheet metal and may be of any desired size. The bottom wall 5 has attached thereto leg members i for supporting the receptacle on a table, work bench or the like,

Mounted within the receptacle 5 and substantially centrally thereof is a container Il, said container being welded or otherwise Xedly secured to the bottom wall 5. The container 8 is employed as a receptacle whose function is to govern the temperature of the solution contained in the receptacle 5, it being understood that the solution is outside of and entirely surrounds the container 8. As is well known, in the developing of films it is essential that the solution be maintained at a temperature between 68 and 72 F. Warm water can be added to the container 8 for raising the temperature of the solution o1' ice can be added thereto for lowering the temperature of the solution. When developing lms it is customary to employ a stirring rod equipped with a thermometer and thus the temperature of the solution within the receptacle 5 may be at all times governed. An outlet 9 is formed in the developing solution and the bottom wall E which communicates with the container 8 for permitting discharge of the fluid contained therein.

The invention further includes the use of a cylinder I ll which is removably held within the receptacle 5 and slidably disposed over the container 8. The cylinder I5 is preferably perforated as shown in the drawing in order to decrease its weight but it is to be understood that a cylinder of solid formation may also be used. The upper end of the cylinder lll is welded or otherwise lixedly secured to the cover I I which cover is applied to the receptacle 5 after the lms have been placed in the developing solution. Thus when removing the cover the cylinder II! is likewise removed and when replacing the cover the container 8 forms a guide for the cover since the cylinder is slidable thereover. The upper edge of the receptacle 5 is formed with an annular reinforcing band I2 over which the cover is disposed.

The cylinder II) provides a means for supporting the lm to be developed, the film being suspended from rack bars carried by the cylinder. An annular band I3 is suitably secured to the upper end of the cylinder II) and a similar band I4 is suitably secured to the lower end thereof. Projecting laterally from the band i3 are a plurality of substantially U-shaped brackets I5, the same being held in spaced relation. The band I4 has projecting laterally therefrom a plurality of arms I 6 arranged in spaced relation. The film to be developed, shown diagrammatically in Figure 1 and designated by the reference numeral I7, is looped over the U-shaped brackets I5 in the manner shown in Figure 2 and the ends of the film are united by means of a conventional clip I8 carried by the arms I6, said clip being lheld under a slight tension by means of the spiral spring I9.

In operation, the cover I I is removed from the receptacle 5 carrying with it the perforated cylinder l0 and its associated brackets I5 and arms I 6. The film is then looped over the brackets and attached to the arms in the manner previously described after which the cylinder is disposed over the container 8 within the receptacle 5 and the cover II moved to closed position. The receptacle 5 has previously been filled with the temperature thereof governed by means of the container 8 as previously described. The film is allowed to remain in the developing solution for the required amount of time after which the cover and cylinder carrying the film are removed and inserted in a fixing solution and subsequently in a washing solution without the necessity of removing the lm from its support. The manner of supporting the lm on the brackets l and arms i6 will hold them rigid alleviating the possibility of buckling or curling of the nlm. As afore indicated, the films may be developed, rinsed, fixed and washed without removal from the hangers and may also be dried on the hangers if desired. The construction of the receptacle 5 and container 8 allows them, after being drained, to be easily washed and rinsed. This construction also allows for the use of a minimum amount of solution which may thus be renewed with fresh developing solution as often as desired.

The solution Within the receptacle 5 is drained through a plugged outlet 20 formed in the lower end of said receptacle.

Guide wires 2|, preferably four in number, eX- tend from the band I3 to the band I4 for facilitating the threading of the film over the brackets l5 and arms i6 when begining to load the hanger. As is to be understood, the loading of the hanger is accomplished in a dark room therefore the guide wires 2l materially aid in initially placing the iilm on the hanger.

Also it will be understood, of course, by those skilled in the art that variations in the hereinabove described device involving the substitution of substantial equivalents for the devices described are intended to be comprehended within the spirit of the present invention and that the invention is capable of extended application and is not confined to the exact showing of the drawing nor to the precise construction described and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

What is claimed is:

1. An apparatus of the character described comprising a receptacle, a cover for said receptacle, a container mounted within said receptacle, means carried by said cover and guided by said container for supporting lm to be developed within said receptacle, and means projecting laterally from said irst means for maintaining said nlm under tension within said receptacle.

2. An apparatus of the character described for developing lm comprising a receptacle for containing a developing solution, a container for a temperature controlling solution mounted Within said receptacle substantially centrally thereof, a cylinder slidably disposed over said container, a removable cover for said receptacle, the upper end of said cylinder being secured to said cover so as to be removed from said receptacle upon lifting said cover, and hanging means carried by said cylinder for iilm to be developed in said receptacle.

3. An apparatus of the character described for developing iilrn comprising a receptacle for containing a developing solution, a container for a temperature controlling solution mounted within said receptacle substantially centrally thereof, a cylinder slidably disposed over said container, a removable cover for said receptacle, the upper end of said cylinder being secured to said cover so as to be removed from said receptacle upon lifting said cover, annular bands mounted on the upper and lower ends of said cylinder, U-shaped brackets projecting laterally from the upper band and laterally projecting arms carried by the lower band, said brackets and arms adapted to support film to be developed within said receptacle.

LOUIS GOLDEN.