US1127851A

US1127851A - Pack-casing for photographic-film packs provided with pulling-tabs.

Info

Publication number: US1127851A
Application number: US76772713A
Authority: US
Inventors: Oscar Becker
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-05-14
Filing date: 1913-05-14
Publication date: 1915-02-09
Anticipated expiration: 1932-02-09

Description

0. BECKER.

PACK CASING FOR PHOTOGRAPHIG FILM PACKS PROVIDED WITH PULLING TABS.

APPLICATION FILED MAY 14, 1913.

1,127,851 Patented Feb. 9, 1915.

Vjinessm: lm rmiar:

flttorizey THE NORRIS PETERS ca, PHOTc-LITHQ. WASHINGTON, n. c.

"UNITED STATES PATENT @FFHUE.

oscan BECKER, or s'tinnnnn, NEAR BERLIN, GERMANY.

Specification of Letters Patent.

Patented Feb. 9, 1915.

Application filed May 14, 1913. Serial No. 767,727.

To all 207mm it may concern;

Be it known that 1, Oscar BECKER, a subject of the German Emperor, residing at Tempelhoferstrasse 78", Siidende, near Berlin, Germany, have invented certain new and useful Improvements in Pack-Casings for Photographic-Film Packs Provided with Pulling-Tabs, of which the following is a specification.

This invention relates to the type of pack casings for photographic film packs provided with pulling tabs, in which a partition separates the exposed films from the unexposed films. Existing film pack casings of this type when made of paper or cardboard, have the drawbacks that they easily get bent in being handled, and also that they are very liable to allow light to penetrate at the front edges. Such film pack casings when made of sheet metal while avoiding those drawbacks, have however the disadvantage of being complicated, difficult and costly to make, because their manufacture requires a comparatively large amount of sheet metal. Namely the front and the back of the pack casing and the partition between the exposed and unexposed films require metal sheets each approximately of the superficial area of the pack casing. In order to keep out the light, the corners of box-like parts have to be made comparatively sharp and deep. which occasions considerable diiiiculty and waste of material in the manufacture. These well known boxlike pack casings have also the drawback that it is not possible to take out a film singly without having to open the whole pack casing for this purpose and thus running the risk of deforming the pack casing.

N ow the present invention has for its object to provide an improved film pack casing of the above specified type consisting of sheet metal, and so made that the cost of its manufacture shall be low, and the improved pack casing shall allow of the exposed film being taken out singly in a very simple manner without damaging the pack casing or having to open the whole pack casing forthis purpose. This object is effected according to this invention by constructing the improved film pack casing with a back wall provided with a slide and with spring pressure members, one narrow end of the said back wall being curled over so as to form one side of the guiding frame on the front of the pack casing. The other sides of the guiding frame are constituted by a cross-member and two narrow recessed side members which engage cover-fashion over the edges of the back wall, the curled end of the latter and the ends of the cross member, and thereby close the pack casing in a light-tight manner. The spring members of the back wall serve to press the film pack against the guiding frame, and for this reason the partition between the exposed and unexposed films need no longer be made of metal as is the case with most existing pack casings. All the parts of the pack casing are held. together firmly and permanently by cross rods fixed in the ends of the sides by riveting or any other means. One of these rods serves also as a support over which the films are bent in the changing operation.

One embodiment of this invention is illustrated by way of example in the accompanying drawings, in which Figure 1 is a vertical section of the improved pack casing, and Fig. 2 is a perspective view of the several constituent members of the same taken apart to show the internal construction.

As shown. anv desired number of films (7 with their usual pulling tabs 7' are arranged against a partition a made for instance of cardboard, back strips 7) impervious to light being located in the usual manner between thefilms. The stri s 7) proiect beyond that edge of the films which is opposite the pulling tabs and are held at this spot in the usual manner bv means of a rivet or the like in a mount 0. This device prevents the next film which is not to be changed from being removed with the film to be changed.

The improved pack casing consists of the back wall (Z, which is out out at one end for the insertion of a sl de e and is curled over at its other end. This curled end r constitutes one end of the casing and its edge is situated at such a distance from the back wall (Z as to allow the upper end of the film pack to he slipped into the curl r.

f are short pieces left standing at the sides of the back wall (Z; they are cut out in the form of springs g and are so bent as to bring these springs approximately parallel to the back wall (Z at a determined distance from the latter.

The lower edge of the pack casing is constituted by a round bent sheet metal cross member it having a smooth back 2' which cooperates with the slide e slidably mounted on the back wall d to form a slot, through which the pulling tabs y project to the outside of the pack casing.

The sides of the pack casing are formed by narrow cap-like sheet metal members 7r with rounded ends; their projecting borders embrace cover-fashion the longitudinal edges of the back Wall, the curled end 1' and the ends of the cross member h. The caps is also constitute the longitudinal sides of a frame for guiding the filmpack. The transverse sides of this guiding frame against which the unexposed portion of the film pack lies, are constituted by the edges of the curled end 7 and the cross member h.

0 are holes formed in the side caps in near the ends thereof, for the reception of stay rods m, n.

'T he operation of putting up a film pack in the improved film pack casing is as followsz-The film pack is placed into the open pack casing, the pulling tabs 7' being led underneath the springs g, and the partition a is placed on the latter! '1 he pulling tabs are bent over toward the back in the usual manner so that their bends come underneath the curl 1'. Then the pack casing is closed by vslipping the sheet metal caps 70 over the edges of the back wall cl and the ends of the cross member h. The projecting borders of the sheet metal caps is thus come over the front of the film pack and form, with the cross member h and the edge of the curl r, the guiding frame for the film pack. The free ends of the pulling tabs j then project through the slot formed by the surface 2' of the cross member 7; and the slide 6. The

latter is. provided with a jointing strip.

Then the stay rods m, n or equivalent devices are slipped through the holes 0 in the sheet metal caps k, and their ends riveted over on the outside, thereby fastening together the assembled parts so as to form a strong self-contained pack casing in which the film pack is inclosed in a perfectly lighttight manner.

The upper stay rod '11, is situated under the bending place of the pulling tabs j, so as to serve as a support over which the films are bent in being changed. The stay rod m is situated inside the curved part of the cross member ii- If desired, the stay rod n may be inserted first in its proper position in the film pack, in which case the caps 79 will then have .to be slipped over the ends of the stay The mount 0, may be provided with stops 7) against which the edges of the back sheets Z) bear in changing the films.

If it is desired to take out one or more films before exposing all the films, it is merely necessary to open the slide 6, which can be done in the dark, without risk of the remaining films in the pack becoming disarranged or spoiled.

What 1 claim is 2- V 1. In a photographic film pack casing for holding a pack of films with pulling tabs and a separating wall between the exposed and unexposed films, the combination of two rounded or channel-shaped cross members, a back wall, and two separate side caps engaging the ends of said cross members in a light-tight manner, whereby an improved film pack casing is produced wherein the edges of said cross members and said side caps constitute together the frame against which the films are pressed into the focal plane, and which said edges also constitute abutments and a light-tight closure for the back Wall.

2. In a photographic film pack casing of the type specified, the combination of two rounded channel-shaped cross members, a back wall, two side caps each with a perforation in each end adapted to embrace coverfashion the edges of said cross members and said back wall, and two stay rods for staying the pack casing in the transverse direc tion, one of said stay rods passing through the perforations in the adjacent ends of said side caps, and inside the corresponding cross member located between said side caps, and the other stay rod being similarly arranged at the opposite end of the pack casing, one of said stay rods serving also as a support over which the films pass in being changed.

3. In a photographic film pack casing of the type specified, the combination of a back Wall having a rounded channel-shaped cross member integral therewith at one end, a rounded channel-shaped cross member at the opposite end of said back wall but not integral therewith, a side cap at each side of the caving fitting the corresponding edges of said two cross members and said back plate, and means for holding transversely the two side caps tightly against the intermediately located cross members and said back plate.

4;. In a photographic film pack casing of the type specified, the combination of a back plate, rounded channel-shaped cross members at the top and bottom ends of said back plate, side caps fitting the two side edges of said back plate and said cross members,

pressure springs integral with said back,

plate for pressing each fi m f r exposure plate to provide a space for the exposed films between said springs and said back plate, and means for holding transversely said side caps tightly against the intermediately located cross members and said back plate.

5. In a photographic film pack casing of the type specified, the combination of a back plate having an aperture therein, rounded channel-shaped cross-members at the top and bottom ends of said back plate, side caps fitting the two side edges of said back plate and said cross members, means for holding transversely said side caps tightly against the intermediately located cross members and said back plate, and a slide normally covering the aperture in said back plate, and adapted to uncover same to allow of the removal of the exposed films singly, said slide being located at a sufficient distance from said cross member to form a slot for the passage therethrough of the pulling tabs of the films.

In testimony whereof I aifix my signature in presence of two Witnesses.

OSCAR BECKER.

Witnesses WOLDE AR HAUPT, HENRY HAsPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.