DE418852C - Metal housing for photographic cameras - Google Patents

Description

Manufactured from a piece of sheet metal by drawing, bending, pressing and pressing Camera housings for photographic apparatus intended for plates or film packs So far, certain assembly work was still necessary; individual parts had to go through Soldering or welding can be connected to each other.

In contrast, the invention exists

ίο all in the fact that, in a camera housing for photographic film intended for plates or packer apparatus, the side walls of the housing with the Biklrahmen, the 'cassette guide bars and the limitation!

The tongue strip for the cassette insert forms a whole without soldering or welded seams.

In Fig. 1 the housing is shown, while Figs. 2 to 6 are schematic representations that is used in the stamping production of the housing coming punches and dies are. They also show the evolution of the case from the first drawing process to the finished housing.

The camera housing (Fig. 1) consists of the housing α, open on one side, with picture frame b, two sealing plush grooves c, d and cassette guide strips e, f, which are closed on one narrow side with strip g to limit the cassette slot. All of these parts form a whole without soldering or welding.

The same is made from a suitably strong rectangular (e.g. aluminum) Sheet metal plate, soft using correspondingly shaped dies and punches in a generally known manner in the illustrated Shape is drawn, bent, pressed and pressed.

According to the invention, it has segment-shaped cutouts t projecting slightly inward on the narrow sides, as indicated by the dotted line in FIG. This for the purpose that the walls can give way to the material stresses and compression when upsetting. By pressing and drawing, this piece of sheet metal is first brought into the shape of a rectangular deep bowl with rounded bottom edges using the punch h shown in Fig. 2 and the die /, which are then made sharp-angled by further pressing with a sharp-edged punch and corresponding die. The housing formed in this way is now placed with the bottom b facing up in a die I provided with a corresponding core piece k , which also encloses the housing for the continuation of the process, and, as can be seen from Fig. 3, between the walls of the Both long sides lying part of the bottom sunk by a step stamp m by a certain amount. The bending edges or strips p formed in the process must be rounded and remain correspondingly wide so that they can later be transferred into the guide strips.

In this press, according to the invention, the walls of the narrow sides are also compressed, filling the segment-like cutouts, in a perpendicular direction to the floor surface, with the bar g remaining slightly protruding from the floor surface to limit the cassette slot. At the same time, the two slightly deep transverse grooves d for attaching the plush strips are pressed into the bathing surface during this process, for which purpose the stamp tn is designed accordingly,. By means of a similar punch η with a sharper bottom surface (Fig. 4), the strips p formed on the long sides of the housing bottom j are first formed into a sharp-edged rectangular shape and then pressed into an upright rectangle q by means of a scissors punch 0 (Fig. 5). As shown in Fig. 6, a steel template r modeled on the cassette cross-section is inserted as a base between these two strips q. The longitudinal strips are then turned over and pressed into two guides by means of a further ram u for inserting the cassette. For this purpose, the ram is conically deepened inwards so that its longitudinal edges i (Fig. 6) fold over the strips q (according to Fig. S) and, with the help of the template ν, bend them into the cross-sectional shape required for guiding the cassette and press ( Fig. 6).

The recesses r and s (Fig. 1) required on the insertion side of the cassette are created by shearing off the strips / at this point.

Now that the middle part of the floor area has been punched out, the camera housing is including the guide rails and the plush grooves completely finished, so that no further processing by milling, riveting or welding is required.

The housing produced in this way meets all requirements for strength and 8e Accuracy and, made of aluminum, is particularly low in weight.

Claims (2)

Patent Claims: 8S 1. Metal housing for photographic cameras, characterized in that the cassette guide strips (e, f) and the delimitation strip (g) for the insertion of the cassette with the side walls of the housing (a) and the picture frame (b) form a whole without a perpendicular or welded seam. 2. A method for producing the camera housing according to claim 1, in which the same is drawn, bent, pressed and pressed using correspondingly shaped dies and punches from a piece of sheet metal (aluminum), characterized in that the narrow sides of the rectangular sheet metal piece to be processed with segment-shaped cutouts (f) and that, after the sheet metal piece has been drawn into the shape of a square deep shell, at the same time as the bottom is pressed in, for the purpose of preparing the cassette guide strips (e, f) and the formation of the limiting strip (g) for the cassette insert, are compressed while filling these segment-shaped cutouts. 1 sheet of drawings.