DE342035C - Photographic cassette with display device - Google Patents

Description

ISSUED OCTOBER 12, 1921

GERMAN EMPIRE

REICH PATENT OFFICE

PATENT LETTERING

CLASS 57a GROUP 11

Viktor Kaiser in Lublinitz, O.-S.

Photographic cassette with display device. Patented in the German Empire on May 23, 1920 '.

The invention relates to a display device for photographic cassettes in which the inserted plate is pressed under a fold by a spring in the cassette body will.

In the known device of this type, an identification mark is attached to the spring, which is visible through a window when the cassette is loaded and thus the status the cassette can be recognized. In this device, what is required on the cassette for observation of the detection disc must be Windows consist of a red disk, allowing actinic light to penetrate into

to prevent the cassette. However, this requires a disc that is as dark as possible, which hinders observation. To now also have a clear glass pane, as is the case with other display devices is known per se to be able to attach without having to fear that light penetrates the cassette, is after the invention, the identification disc on a light-tight penetrating the cassette body, fixed by the plate retaining spring influenced guide rod.

The invention is illustrated in the drawing in one embodiment. It shows: Fig. Ι a cassette with a raised ig slide in front view, the lower wall of which is partially broken off, so that the display devices are exposed,

Fig. 2 the same with an inserted plate in the same representation as Fig. I; Figures 3 and 4 are cross sections of the cassette according to 3-3 of Fig. 2, which shows the position of the slide before and after exposure of the plate illustrate.

The cassette α with its slide b covering the photosensitive plate, which is guided in the side guide rails a ^{1 of} the cassette, is equipped with folds α ² , a ³ , which grip over the inserted plate c and secure it against falling out. In the lower part of the cassette there is a curved leaf spring d, which has ³ support with its ends in the folds a. In the lower cassette body 0 ⁴ , a slide rail e is guided, which is connected to a plate f which is provided with a letter or other features (z. BP). The slide rail β is pressed against the leaf spring d by two helical springs g which press against the plate f and which have an abutment in the bottom of the cassette. The cassette body α ⁴ has in its lower part a window b ¹ into which a disk is inserted (dash-dotted lines in Fig. 1). Furthermore, a U-shaped bent leaf spring h is fastened in the cassette body, which has a button or other raised part h ¹ on its outer leg, which protrudes into an opening a ^{5 in} the cassette body.

The effect of the device is as follows: The empty cassette shows no mark in the window b ¹ (dash-dotted in Fig. 1) of the cassette body a ⁴ . If a plate c is now inserted after pulling out the slide, the leaf spring d is tensioned, which presses the plate c under the fold « ² and pushes the slide rail β down together with the plate f attached to it, so that the letter P is behind when the cassette is closed the window b ^{1 of} the cassette body α ⁴ comes to rest and is visible from the outside. This symbol indicates that the cassette is full.

If, for the purpose of a photograph, the cassette a , recognizable as full by the mark P, is inserted into an apparatus and the slide h is pulled out to expose the plate c, the U-shaped spring h with its button h ¹ passes through the opening a ⁵ of the cassette body α ⁴ through into the path of the slide. As soon as the slide b is pushed into the cassette after the exposure of the plate has ended, it strikes against the button h ¹ which has emerged from the opening a ⁵ and which prevents the cassette from being completely closed. One can now see from the not fully inserted cassette slide b and from the button h ¹ protruding from the cassette wall that the cassette 'contains an exposed plate.

If the cassette is filled again, it is sufficient to press the button h ¹ in order to be able to push the slide b, which has been introduced into the cassette at the same time, all the way in. The button h ¹ is now invisible and the slide is completely closed. This is a sign that the plate can be exposed.

Claims (2)

Patent Claims: 1. Display device for photographic cassettes, which is influenced by a spring holding the inserted plate in its position, characterized in that the identification disc (f) is attached to a guide rod which is light-tightly penetrating the cassette body («*) and is influenced by the plate holding spring (d) and through a guide rod (β), which leads through a hole in the lower part of the cassette (a) to the disk retaining spring (d) in a light-tight manner, is moved by the disk retaining spring (d) so that light cannot enter the disk, while a known Spring button arranged in a manner (A) when the cassette 10 = cover (b) is pulled out and prevents the cover from closing again completely, so that it is indicated that the plate has already been exposed. 2nd embodiment of the display device nc device according to claim 1, characterized in that the identification disc (f) is attached to a cross beam influenced by counter pressure springs (g). 1 sheet of drawings.