Патент USA US2114638код для вставки
April 19, 1938. J. H. s. PARKER - 2,114,638 LIGHT SEAL Filed Feb. 1'7, 1937 J. Henry S. Parker IN V E NTOR. M)» M @4175‘ ATTORNEYS 2,114,638 Patented Apr. 19, 1938 UNITED STATES FATENT OFFICE 2,114,638 LIGHT SEAL J. Henry S. Parker, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application February 17, 1937, Serial No. 126,243 4 Claims. ' (Cl. 95-67) This invention relates to photography and par~ ticularly to light seals for holders for light-sensi tive photographic material. One of the objects of my invention is to provide 5 a light seal of fabric which is rugged in con struction and which is effective in preventing light rays from passing to sensitive material held by the holder. Another object of my invention is to provide a light seal of relatively coarse and 10 strong material which is arranged in a plurality of rows of tufts, these tufts being so positioned that light passing through certain of the tufts will be blocked by other tufts of the material. Another object of my invention is to provide a 16 light lock including at least one strip of tufted fabric, the rows of tufts being arranged in par allel and staggered relation. Still another object of my invention is to provide a fabric light lock which is not too resistant to material passing 2 o . through the light lock opening. A still further object of my invention is to provide a suitable light lock for plate holders, ?lm packs or the like. Coming now to the drawing, wherein like ref 25 erence characters denote like parts throughout: Fig. 1 is a perspective view of a typical ?lm. pack utilizing a light lock constructed in accord ance with and embodying a preferred form of my invention. Fig. 2 is an enlarged fragmentary detail section taken through the light lock passageway for the ?lm pack tabs of the ?lm pack shown in Fig. 1. Fig. 3 is a perspective view with parts broken away showing a typical plate holder provided 35 with a light-tight passageway utilizing the tufted material of my invention. Fig. 4 is a fragmentary detail View on a greatly magni?ed scale showing a portion of a preferred form of the tufted material utilized in making 40 the passageways for light-sensitive material light-tight. Fig. 5 is a fragmentary enlarged sectional view of the material shown in Fig. 4. Figs. 6 and '7 show additional types of tufted 45 material which are suitable for use in connection with my invention. In holders for light-sensitive photographic ma~ terial, such as plate holders, ?lm packs and the like, it is necessary to provide a passageway from 50 the inside to the outside of these holders for the reception of dark slides or film pack tabs or other parts which must be manipulated before expos ing ?lms in the holders. It has previously been proposed that a plush material may be used for 65 rendering such passageways light~tight, but it has been extremely dif?cult, if not impossible, to obtain suitable material which has a sufficiently thick nap to prevent light from passing through and which at the same time will not take a de? nite set after being used, so that upon continued use, light may enter. It is desirable to have a material which is com paratively rugged and stiff, so that it will stand a lot of bending and compression without becom ing distorted, but such material is almost always so coarse that light can pass through. With most of the equipment on the market the space pro vided for the light-tight passageway is limited by the size of the holder, and it will be recognized that particularly on ?lm and plate holders for small-sized or “miniature” apparatus, the light locking material is greatly limited in size so that the width of the light-locking strip cannot be in creased beyond a predetermined amount in order to insure added light safety. 20 My invention broadly comprises making a light-tight passageway through a light-sensitive photographic material holder by providing at least one strip of tufted fabric, the tufts of which may be arranged in rows, and, if desired, the rows 25 may be parallel but in different spaced relation one to the other. Any one row of tufts on this material is not, in itself. light-tight because each individual tuft is shaped more or less like a trun cated cone with the small end down, and be 30 cause of the fabric holding the tufts, it is difficult, if not impossible to space the tufts close enough together to prevent light from entering. How ever, by staggering the tufts, two or more rows will make a satisfactory light-tight covering which may be placed on one or both sides of the passageway. I have found that a wool-tufted material is quite desirable because the wool ?bers do not readily break off or lose their resilience, and be cause I have been able to obtain a special weave of such tufted material which fully answers my purpose. In Fig. l I have shown a typical type of ?lm pack designated broadly as l which may com prise the usual metal or cardboard container 2, the walls being substantially rectangular in shape. One wall 3 is in the form of a frame 4 which makes an exposure frame through which ex- _ posures, are made on ?lms attached to tabs 5 which pass through the passageway 53. The ?lm pack may be of any well-known con struction and in Fig. 2 I have illustrated a typical form of light trap for such ?lm packs, but have equipped this light trap with the tufted fabric of (5 2 my invention. 2,114,638 The ?lm pack tabs 5 may pass out through the light trap E which is formed between spaced walls I and 8 of the ?lm pack and in this instance, on both sides of the passage way I provide strips of tufted material 9 and ID. The fabric of the material II and I2 may be ce mented in place or may be held in by the bent over metal walls l3 and I 4. Regardless of how the material is held in, the 10 tufts l5 best shown in Fig. 5, are more or less in the shape of truncated cones with the small ends l8 next to the fabric backing II. It is customary, but not essential, to weave this material by having two tufts I5 pass through the 15 material with a connected U-shaped twisted part l8 passing through the fabric connecting the tufts. After these have been woven through the fabric, the top may be clipped off at the desired height. 20 With reference to Fig. 4, it will be seen that while the rows E9 of tufts may be arranged in parallel relation transversely of the strip, they are staggered or offset with respect to other rows of the material, so that even though light may 25 pass through one row, since the tufts are spaced apart at their small ends near the fabric, another row of tufts will block off light passing down wardly in the direction shown by the arrows in Fig. 4. 30 It is also possible to have material woven with the rows of tufts at an angle to the edge of the material, such as, for instance, is shown in Fig. 6. Here the tufts are diagrammatically illustrated at 25 and the arrangement is such again that 35 light passing downwardly in the direction shown by the arrows will be prevented, before passing through many rows, from penetrating the tufwd material any material distance. It would be quite desirable if the tufts could 40 be arranged in staggered relation over all the material, as indicated in Fig. 7, so that the tufts 35 would not be in parallel rows or in any regu lar order. While such material can be woven, it is extremely expensive and, therefore, from the 45 practical standpoint, it is of comparatively little use. In Fig. 3 I have shown a typical plate holder 5| having an exposure frame 52 which may be nor mally covered by the usual dark slide 53. Across the top of the plate holder there may be the usual ?ange 515 for making a light-tight connec tion with the camera in which it is placed. In plate holders, there are usually two passageways 55 through which dark slides 53 may pass, since 55 plate holders of this type are usually of the “double” variety. In order to make a light trap which will prevent light from passing through Plate holders, of course, are used for a much longer time than ?lm packs and consequently the light locking material is subjected to long con tinued wear. With tufted material constructed as above described, I have found that these light locks retain their efficiency over long periods of time, because the individual tufts or brush-like members seem to bend and spring back into place quite readily, this being particularly true be cause the tufts can move somewhat like a plu 10 rality of small brushes. It is obvious that my invention is suitable for any types of holders in which photographic light sensitive material is used. Such material, of course, may be plates, cut ?lms and ?lm packs, regardless of the type of base that the light-sensi tive emulsion may be coated upon. Where I have referred to light-sensitive material in the speci?cation and claims, I intend to include all of the well-known types of emulsion-coated bases. 20 What I claim as my invention and desire to be secured by Letters Patent of the United States is: 1. In a holder for light-sensitive photographic material, the combination with a casing, of an exposure frame carried by the casing, means for holding light-sensitive material therein, walls in cluded in the casing spaced apart and forming a passageway extending through the casing, and a light trap for said passageway comprising at least one strip of tufted material comprising a plu 30 rality of rows of tufts, said tufts being so ar ranged with respect to the edges of the light trap opening that light passing through the tufts of one row may be blocked by the tufts of another row, the tufts of one row being offset with respect 35 to the tufts of another row, said material com— prising a wool pile fabric, the individual strands of which are comparatively tough and having a series of the individual strands made into tufts, thereby holding the individual strands upwardly 40 from a fabric base. 2. In a holder for light-sensitive photographic material, the combination with a casing, of an exposure frame carried by the casing, means for holding light-sensitive material therein, walls in cluded in the casing spaced apart and forming a 46 passageway extending through the casing, and a light trap for said passageway comprising at least one strip of tufted material comprising a plurality of parallel rows of tufts, said tufts of one row being staggered with respect to the tufts 60 of another row whereby light which may pass between the tufts of one row may be blocked by the tufts of another row, said material compris ing a wool pile fabric, the individual strands of which are comparatively tough and having a series of the individual strands made into tufts, this passageway when the dark slide 53 is re thereby holding the individual strands upwardly moved for exposing the light-sensitive material, from a fabric base. 3. In a holder for light-sensitive photographic material, the combination with a casing, of an 60 exposure frame formed in one wall of the casing, 60 I provide one or more strips of tufted material 56 which may be of the above described varieties to contact with the dark slide or the walls of the passageway. With ?lm packs and to a less extent with plate holders, it is desirable to have a light trap which does. not materially retard the passage of material through the passageway. In ?lrnv packs, the paper tabs 5 pass through the passageway and it is de sirable to have them move as freely as possible, 70 and yet it is also necessary to have a light trap which absolutely prevents light from . passing through the opening. With tufted material made as above described, I have found that the tabs slide very readily and that the light locking prop— erties are excellent. means for holding light~sensitive material behind the exposure frame, said casing walls including a passageway through the casing through which tabs attached to the light-sensitive material may 66 pass, and a light trap for said passageway includ ing at least one strip of a tufted material having the tufts thereof arranged in staggered relation to prevent light passing between certain tufts from passing through said light trap, said tufts 70 pressing against the tabs passing through said passageway, said material comprising a wool pile fabric, the individual strands of which are com paratively tough and having a series of the in— 16 2,114,688 dividual strands made into tufts, thereby holding the individual strands upwardly from a fabric base. 4. In a holder for light-sensitive photographic material, the combination with a casing, of an exposure frame formed in one wall of the casing, means for holding light-sensitive material behind the exposure frame, said casing walls including a passageway through the casing through which 10 tabs attached to the light-sensitive material may pass, and a light trap for said passageway in cluding at least one strip of a tufted fabric hav 3 ing the tufts arranged in a plurality of rows, the tufts of one row being spaced differently from the tufts of another row whereby openings between the individual tufts of one row may be covered by the tufts of another row and light rays are prevented from passing through the passageway, said material comprising a wool pile fabric, the individual strands of which are comparatively tough and having a series of the individual strands made into tufts, thereby holding the individual 10 strands upwardly from a fabric base. J. HENRY S. PARKER.