US1711444A - Plate holder - Google Patents

Description

C. BORNMANN PLATE HOLDER April 30, 1929.

Original Filed May 13 1926 INVENTOR CM!- BQQNHA A RNEY Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

CARL BORNEIA'NN, OF BINGHAlvITGN, NEW YORK, ASSIGIRTOB, BY MESNE ASSIGN- lYEENTS, TO AGFA ANSCG CORPORATION, OF BINGHAMTON, NEW YORK, A CORPO RATION Q1 NEW' YORK.

PLATE HOLDER Application filed May 13,

5 stood however, that such reference is llltO'iiQled to include film holders as well.

As is well known, the usual plate holder is provided at one end with a hinged flap or member which serves the combined purposes of permitting access to the frame, whereby the plates may be placed therein, and also that of so closing the lower end of the frame after the sensitized plate has been placed therein, that actinic light is effectively locked out of said frame. To this end, the hinged flap is orcinarily formed to overlap the lower ends of the side pieces of the holder frame, and is also provided with a groove for receiving the lower end of the darl; slide, when the flap is in closed position, wherehy the same may be so held.

The difficulty of such construction, however, lies in the fact that at the points of overlapping between the hinged flap and the frame members, there are necessarily cracks and crevices which, unless very tightly closed, are apt to admit light through. the frame to the plate in the holder. This is particularly true in the case of holders provided with springs for normally forcing the plate outwardly into the proper focal. plane. The constant outward pressure of the SPlIiiE? and plate have a tendency to open the lillfi'tillflli'i) so that up n the withdrawal of the dark ide,

or if the 1 ap happens to be a. loosely litti one, the flap may l forced open HllQ' W d's nce, tiius permitting; light to enter around ie overlapping;- edges and expo-4e the plate or film. is the purpose and principal olijcct of my invention to provide a. securing the fiapin its closed po means which siinultaneo r L, points of overlapping l frame, therehy pi'evei light leaking; therethroi i.

better insurance agar t light, first hy positively preven ng of the flap by the pressure of the spring or plate within the holder, and secondly, by oinpletely covering all of the joints, cracks, crevices and overlapping points between the flap and the frame, which constitute the weak points of the holder of today.

An understanding of the manner in which 1926, Serial No. 108,872. Renewed March 8, 1929.

I accomplish these results, may be had by reference to the accompanying drawing wherein like reference numerals indicate like parts.

In the drawing:

Figure 1 is a perspective view of my improved plate holder showing the hinged flap in its open position, and illustrating clearly the securing; means therefor.

Fip'ure 2 is front plan vi w of the holder with the flap closed, and the securing devices or catches ready to be closed.

Figure 3 Ira is a detail of one corner of t e inc showing the flap closed and the catch in securing; position.

Figure 42 illustrates av modified form of the catch, and is a detail figure similar to Figure l have illustrated my invention in connc-ction with the usual type or form of plate holders, which comprises the frame including side pieces 1 and 2, end pieces 3, and the flap e'l hinged to the bottom of the frame in any suitable manner, by a cloth li'na e indiaited 5. As is well known, the irraine of the holder is provided with a partition or soptuni (5, extending between the frame pieces 1 and 2. and the end pieces 3, centrally thereof, thus dividing the rame into two compartments. one on eithe' side of the partition 6. In each of the coii'i iartincuts, the side frame iiieniliers l are provided with the and s ceii'e th revolve t ordinzi y dark slide 9, wh

i'i-yiufg of the holder in dayl' the plate. The free eds d with a. recess l0 into no of the dark s when the flap is closed, as we and the slide is pushed wardly its full length.

The lower end piece 3 of the frame is shouldered as at 11, and the flap l is similarly shouldered as at 12, whereby a comparatively light leer is formed between these two elements when the flap is'closed. It will also be noted from Figure 1, that the frame meniie lo wcr c 33 shown downber. 1 and 2 are cut away as at 18 at their lower ends to receive the overlapping; ends iencc in sliding the holder in and out of a camera. It will also be noted with referenc to Figure 1, that the flap is provided adjacent its end with shoulders 14': which engage just inside of the frame pieces 1 and :2 when the flap is closed. This is to furnish an additional light lock A spring may be cured to the part .'on or septum 6, centrally thereof, to exert a tension outwart ly whereby the varying width of the plates which are used in the holder may be compensated for by pressing said plates outwardly to the limit of their movements, whereby the plates are held in the proper focal plane.

It will be understood that the plate holder just described is provided with the identical construction shown in Figure 1 on the opposite side also, making it possible to carry two plates in the holder. Inasmuch as the construction of both sides is identical, it is deemed necessary to show and describe only one of them.

As before stated, the weak points in the construction so far described, lies in the fact that the shoulders 11, 12 and 14 as well as the ends of the flap which overlap the cutaway portions 13 of the frame, are not always tight fitting, or become loose, or shrink, or are opened slightly by the outward pressure of the spring 15 on the plate, thereby admitting light around such shoulders to the plate. To overcome this difiiculty and to at the same time provide a means for securely holding the flaps tightly closed, and for covering the exposed joints and points of overlapping, I have provided each of the frame members 1 and 2 with the pivoted catches 16. These catches are pivoted at one end as at 17 to the sides of the frame members 1 and 2, and are provided at the opposite end with the embracing flanges 18 adapted to fit over the ends of the flaps 4, when in exposed position, and when so fitted to cover the points of overlapping between the flap and the frame. The frame me nbers 1 and 2, and the flap 1, are cut away as at 19, to a depth ec ual to the thickness of the material of the catc es 16, whereby the outer surface of the catches will lie in the same plane as the outer surface of the holder.

Figure 4: shows a modified form of catch 20 pivoted at 21, and which differs from the catch 16, only in that it is the same width as the frame member 2 and may be of the length shown in Figure 4, or extend completely down to the end of the frame member and flap as shown in dotted lines at 22. There is some advantage in this type of construction over that shown in Figure 1, in that the cut away portion 23 extends completely across the frame and is thereby easier to form than the cut away portion 19 of the modification shown in Figure 1.

In the operation of the holder, the dark slide 9 is first removed, the catches 16 raised to the position shown in Figures 1 and 2, the flap 4; pivoted downwardly, and a plate slipped into the holder guided in the groove 8. The flap 4 is then closed, the dark side 9 inserted, and the catches 16 pivoted down wardly to the position shown in Figure 3. The holder is then ready for use in the camera, or for carrying about Until ready for use, without dange of light leaking past the joints between the flap 4 and the frame of the holder, and spotting the plate or film.

Many changes in details of construction and operation may be made .vithout departing from the spirit of the invention. I do not limit myself therelore to the exact form shown and described other than by the appended claims.

I claim 1. A plate holder comprising a frame provided with grooves for receiving a plate and a protecting slide located therein. a hinged flap at one end of said frame permitlinf access to said grooves, and means independent of said slide movably mo ed on sa d frame for enge the ends 01 s: -d flap and securing the sam in closed pos ion.

2. A plate holder comprising a frame provided with grooves for receiving a plate and a. protecting slide located therein, a hinged flap at one and of said frame permitting access to said grooves, said flap also providing a light lock for said plate, and means independent of said slide movably mounted on said frame for securing said flap in closed posi don and for covering the pointsat which said fla p and frame overlap.

8. A plate holder comprising a frame provided with grooves for receiving a plate and at protecting slide located therein, a hinged flap at one end of said frame permi 'ng ac cess to said grooves, said flap being sho i ered and overlapping said fran'ie to provi 1 light lock for said plate, and catches pivotc to said frame for embracing the ends of said flap to hold the sane in ciosed position and to cover the points of overlapping between said '1 lap and frame.

A plate holder con p vided with grooves for r A protecting slide locat--d therein. a h' at one end of said. fran'ie permitting access to said grooves, said flap being shouldered and overlapping said frame to provide a light lock for said plate, catches pivoted to said frame adjacent said flap and adapted to embrace the ends of said flap when in closed position whereby to secure it in such position and cover the points of overlapping between said frame and. flap, said frame and flap being cut away to receive said catches whereby the outside surfaces of said frame, catches and flap lie in substantially the same plane.

CARL BORNMANN.

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