US2770178A

US2770178A - Holder for carriers of light sensitive emulsions

Info

Publication number: US2770178A
Application number: US281816A
Authority: US
Inventors: Karpf Nikolaus
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-18
Filing date: 1952-04-11
Publication date: 1956-11-13
Anticipated expiration: 1973-11-13

Description

Nov. 13, 1956 N. KARPF HOLDER FOR CARRIERS OF LIGHT SENSITIVE EMULSIONS Filed April 11, 1952 L- J L 45 Fig. 1

2 Sheets-Sheet l Mlazaas KARI;

N. KARPF Nov. 13, 1956 HOLDER FOR CARRIERS OF LIGHT SENSITIVE EMULSIONS 2 Sheets-Sheet 2 Filed April 11, 1952 United States Patent HOLDER FOR CARRIERS OF LIGHT SENSITIVE EMULSIONS Nikolaus Karpf, Munich, Germany, assignor to Valentin Linhof, Munich, Germany Application April 11, 1952, Serial No. 281,816

Claims priority, application Germany April 18, 1951 8 Claims. (CI. 95-66) The present invention relates to holders for photographic film plates or similar light-sensitive carriers.

Heretofore known holders of the type to which this invention refers are rather complicated in operation and construction and require great care in order to light-seal light-sensitive emulsion carriers, in particular if such carriers are mounted on glass or like non-flexible plates.

It is, therefore, one of the objects of this invention to provide means affording extremely simple construction of the holder housing for an emulsion carrier which may be readily inserted therein and removed therefrom, said holder being sturdy and may be manufactured at relatively low cost.

It is another object of the present invention ensuring accurate guidance and placement of the emulsion carrier in said holder and the closing of the latter by means of the dark slide without endangering or subjecting the light-sensitive carrier, be it in film or plate form, to any substantial bending.

It is another object of the present invention to provide means facilitating the automatic accessibility to the exposed light-sensitive carrier upon withdrawal of the dark slide and the ejection of said carrier from within said holder therewithout.

Still a further object of the present invention is to provide means facilitating the loading and discharge of the holder substantially on opposite sections thereof within a darkroom.

Still another object of the present invention is to provide means conducive to a compact holder or duplex holder device for light-sensitive emulsion carriers and to a considerable reduction of the length of such holder when compared with holders of known constructions.

These and other objects and features will become apparent from the following detailed description, reference being had to the accompanying drawing, in which:

Fig. 1 is a front elevational view of a holder made in accordance with the invention;

Fig. 2 is a side elevational view of the holder of Fig. 1;

Fig. 3 is a fragmentary view of the lower part of the holder of Fig. 1 with one of the spring-actuated frame end means swung to a position of about 90 with respect to the remainder of the holder, thereby exposing guide means for a film carrier;

Fig. 4 is a side elevational view of the holder part of Fig. 3;

Fig. 5 is a fragmentary view of the upper part of the holder of Fig. 1 with parts broken away to expose ejection means for the film carrier;

Fig. 6 is a view similar to that of Fig. 5 with the ejection means shown in a different position for advancing the upper end of the light-sensitive emulsion carrier; and

Fig. 7 shows on an enlarged scale a vertical section through one of the holder sections of Fig. 2.

Reference is now made to the details of the drawings.

According to Figs. 1 and 2 the double holder consists of the frame shaped housing 1 having the two sec- 2,770,178 Patented Nov. 13, 1956 tions 2 and 3. These two sections have the back or partition 4 in common (see Fig. 7). Of the dark slides 5 and 6 only the upper ends with handles 7 and 8 located at the upper edges of the slides are visible. Each of these handles is equipped with an identification tab 9 at one side for indicating the number of the respective picture and on the reverse side is equipped with finger gripping means or grooves 10. The outer part of the frame 11 or 12 of the holder 1 and located adjacent the slot for insertion of the dark slide carries ribs 12 as well as the

erasable identification tabs

13 and 14, which may be used for marking the date and or the object of the picture. At the end of the holder 1 opposite to the side where the dark slide is inserted the hinged

hollow frame ends

15 and 16 are located. These hinged frame ends are shaped to cover the slots through which extend the respective emulsion carriers, which frame ends are secured in closed position by'the engagement with the dark slides 5 and 6 when the latter are inserted in a position parallel to the partition 41 of the two sections 2 and 3. The hinged frame ends 15 and 16 can be swung to about around the

suspension pintles

17 and 18 which are disposed at the end walls of sections 2, 3 and at a level above that of the guides 15a for the insertion of the emulsion carrier into the respective section.

Figs. 3 and 4 clearly illustrate the way how the hinged frame ends can be swung. In this case the slide 5 of the holder is partly withdrawn and as a result the hinged frame end 15 has been turned by means of a torsion spring (not illustrated) into the position as indicated in Fig. 4. The hinged frame end 16, however, is still located parallel to the back 4 of the one section 2 of the holder housing 1 as its dark slide 6not visible in Fig. 4has not been withdrawn in upward direction, thus still securing the frame end 16 in its closed position.

Fig. 5 illustrates a recess or channel 19 of that part 1 of the one section of the holder located beside the inserting side of the dark slide. This recess contains an ejection lever 21 for the respective emulsion carrier when the latter is inserted in this section, say 3, of the holder ejection lever 21 being operable by the handle 20 protruding through a finger-stall at the side of the holder. The ejection lever 21 revolves around the pivot 22. In order to obtain a nearly perfect light trap the handle 20 of the lever 21 is located in the cavity 23 the borders or edges of which are protected by a stripe of plush and therefore by means of a light-proof labyrinth system (not shown). By means of the spring 24 the ejection lever 21 is constantly forced back into its retracted position. The main purpose of the lever is to eject the exposed emulsion carrier before the respective section of the holder is reloaded. Moreover it allows to check whether the respective section of the holder is loaded or not by means of a slight pressure on handle 20. In both cases the ejection lever 21 by means of the handle 20 is advanced toward the position visible in Fig. 6 and by means of its end 25 influences the movement of emulsion carrier 26 located in the respective section of the holder out of the respective open slot upon positioning of frame end 15 as shown in Fig. 4.

Fig. 7 clearly illustrates that the hinged frame end by means of the end of the dark slide 5 inserted in same is kept safely in its parallel position to the holder back 4. The insertion side of the dark slide is provided with a self-locking light trap 27 which consists either of an all around stripe of plush in the inserting zone or of a device where one side of the inserting Zone is coated with plush and is pressed against the other side by spring action. Finally Fig. 7 indicates that the emulsion carrier is held by a pressure plate 29 under spring tension in this section 3 of the holder.

scribed above.

The loading of the respective sections of the holder is performed-while the dark slide 5 is in araised position illustrated in Fig. 3 and the insertion slot being free after the hinged frame end has opened under spring action. After-the dark slide 5-has been again inserted completely, the hinged frame end 15' is kept again in its parallel position to the back 4, which is indicated in Fig. 7. The unloading of the holder is performed while the dark slide 5 and the hinged end 15 is in the same position as de- The manipulations of the ejection lever 21-by means of the handle pushes the respective emulsion carrier out of the section of the holder to such an extent that it can be easily seized by the fingers of a hand and pulled out entirely.

It is to be remarked that the hinged frame ends 15 and 16- located at the outer bottom edge of the holder are part of the guide system of the holder. As a result the hinged frame ends will not open while being inserted into the camera until the respective dark slide is pulled upwardly.

Although one specific embodiment of the invention has been described-and shown in the drawings, it should be noted that the invention may be realized in modified form and adaptations of the arrangements herein disclosed may be made, as may readily occur to persons skilled in the art without constituting a departure from the spirit and scope of the invention as defined in the objects and in the appended claims.

Having thus described the invention, what is claimedas new and desired'to be secured by Letters Patent, is:

1. A holder for light-sensitive carrier means comprising oppositely arranged frame-shaped housings having end walls, open lower ends and a partition common to said housings, oppositely disposed spring-supported walls mounted on opposite faces of said partition, respective dark slide means arranged for movement into said housings and spaced from said spring-supported walls thereof, guide means for the insertion of said carrier means into and for their removal from the lower ends of said housings, said guide means being disposed to extend within said housings adjacent said spring-supported walls, respectively, and for cooperation with the latter, hingedly supported and spring-actuated end frame means for closing said lower ends of said housings and shaped for pressing said carrier means against said spring-supported walls, when said end frame means close on said housings, said slide means being adapted to engage said end frame means to retain same in closed position on said housings,

pivotmeans for each of said end frame means arranged v in recesses disposed in said end walls of said housings and positioned at a level above that of said lower ends of said housings, whereby said spring-actuated end frame means'upon release from said slide means may be swung about said pivot means to a position which permits ready access to said carrier means in said lower ends of said housings,- and ejector means operable from without said housings and engageable with the respective carrier means to displace the later toward and beyond the respective lower housingv end.

2. A holder according to claim 1, wherein said springsupported walls are provided with respective channel, said ejector means extending from said end walls of said housings thereinto, respectively, and being pivoted for shifting said carrier means with respect to the lower ends of said housings in order to readily pull said carrier means out of said lower ends of said housings, said ejector means being accommodated in said channels.

3. A holder for carrier means of light-sensitive emulsion comprising a frame-shaped housing having a closable lower end and opposite end walls provided with recesses, a dark slide engageable with said housing and forming one side wall of said housing, a spring-supported wall forming the opposite side wall of said housing, guide means for said carrier means positioned within said housing and extending from said lower endbetween said spring-supported wall and said dark slide when the latter is inserted in said housing, end frame means supported for swinging movement in said recesses of said end walls of said frame-shaped housing, said end frame means being shaped for engagement with a portion of said dark slide to thereby hold said end frame means in position when closing said lower end of said housing, whereby saidend frame means maintain said carrier means against said spring-supported wall when said carrier is slid along said guide means into said housing, and spring means operatively connected with said end frame means for automatically swinging the later to a position of approximately with respect to the remainder of said frame-shaped housing upon withdrawal of said portion of said dark slide from the engagement with said end frame means, whereby said carrier means is made accessible for insertion into or withdrawal from the frame-shaped housing along said guide means.

4. A holder for carrier means of light-sensitive emulsion comprising a frame-shaped housing having a closable lower end and opposite end walls, each of said end walls being provided with a recess adjacent said lower end of said housing, a dark slide engageable with said housing, guide means for said carrier means extending from said lower end of said housing thereinto, end frame means arranged for swinging movement about said opposite end walls of said frame-shaped housing and supported in said recesses thereof, said end frame means being shaped for engagement with a portion of said dark slide to hold said end frame means in closed position on said lower end of said housing, and means springedly connecting said end frame means with said housing for automatically opening the lower end of said housing by swingingto a position approximately 90 with respect to the remainder of said frame-shaped housing upon withdrawal of said portion of said dark slide from the engagement with said end frame means, so that said carrier meansis automatically made accessible for loading or discharging along said guide means.

5. A holder for light-sensitive carrier means comprising oppositely arranged frame-shaped housing sections each having end walls, closable lower ends and a partition common to said housing sections, spring-supported walls mounted on opposite faces of said partition, respective dark slide mean arranged for movement into said housing sections, guide means for the insertion of said carrier means into and for their removal from said lower ends of said housings, said guide means be-v ing disposed to extend into said housing sections and adjacent said spring-supported walls, respectively, springactuated end frame means for closing said lower ends of said housing sections and shaped for locking said guide means when said end frame means close on said housing sections, said slide means being adapted to engage respective portions of said end frame means to retain the latter in closed position on said housing sections, pivot means arranged in recesses disposed in said end walls of said housing sections and independently and swingably supporting said end frame means, whereby said spring-actuated end frame means upon release from said slide means are swung about. said pivot means to a posi tion of about 90 with respect to said guide means to permit ready access to said carrier means in said lower ends of said housing sections, and means for ejecting;

said carrier mean from said lower ends of said housing sections and accommodated in channels provided in said spring-supported walls.

6. A holder for a camera and for receiving a carrier of light-sensitive emulsion; comprising a dark slide which.

is inserted through a slot at one end of the holder, the opposite end of the holder being provided with a slot through which the emulsion carrier is inserted, a hinged closure end which is held in its closed position by the darkslide when the latter is fully inserted in the holder,

said hingedclosure end being spring-loaded so that it.

opens automatically when the dark slide is withdrawn and out of engagement with said closure end, and a lever for ejecting the emulsion carrier, said lever being pivoted and operable by a handle protruding from the side of the holder and being disposed in a recess adjacent the slot through which the dark slide is interta-ble.

7. A holder according to claim 6, in which said recess is provided adjacent the pivot of said lever and communicates with a groove covered with plush, so as to 'form a light trap.

8. In a holder having opposite open ends and for carrying light-sensitized means; the combination with a dark slide insertable from one end of said holder, of means swingably supported at the other end of said holder and constructed to engage a portion of said dark slide for retaining said swingalble means in one position, in which said other end of said holder is closed, said dark slide when disengaged from said swingable means opens said other end of said holder for withdrawal of said light-sensitized means from said holder, and ejector means provided with a handle and positioned at said one holder end to actuate said ejector means for abutment against said light-sensitized means thereby displacing same toward said other end of said holder upon removal of said dark lide.

References Cited in the file of this patent UNITED STATES PATENTS 531,012 Thornton Dec. 18, 1904 1,711,444 Bornma-nn Apr. 30, 1929 1,933,823 N-agel Nov. 7, 1933 2,114,638 Parker Apr. 19, 1938 2,339,658 Smith Jan. 18, 1944 2,410,919 Aiken Nov. 12, 1946 2,433,613 Little Dec. 30, 1947 2,462,713 Bilofsky Feb. 22, 1949