US3903540A - Daylight developing tank - Google Patents

Daylight developing tank Download PDF

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Publication number
US3903540A
US3903540A US466527A US46652774A US3903540A US 3903540 A US3903540 A US 3903540A US 466527 A US466527 A US 466527A US 46652774 A US46652774 A US 46652774A US 3903540 A US3903540 A US 3903540A
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United States
Prior art keywords
cover
developing
button
developing tank
tank according
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US466527A
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English (en)
Inventor
Jan Hampl
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Meopta np
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Meopta np
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Publication date
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Publication of US3903540A publication Critical patent/US3903540A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/02—Containers; Holding-devices
    • G03D13/04—Trays; Dishes; Tanks ; Drums
    • G03D13/06—Light-tight tanks with provision for loading in daylight

Definitions

  • Developing tanks are in common use for developing photographic material in daylight; such tanks are designed primarily for the purpose of developing striplike material of various sizes. These developing tanks comprise a vessel generallyofa cylindrical form including a lid provided with a varying system of the partition walls preventing penetration of undesired light into the developing space. Another major part of such devices is a core for positioning the strip-like photographic material, which is controlled by means of a stirrer positioned outside the magazine, to agitate the developer or the fixative bath in the course of the developing process.
  • the photographic mate rial is inserted in the developing area in dark surroundings and only after the tank has been closed can the process be continued in daylight.
  • a daylight developing tank for photographic sheet or flat material comprising a parallelpiped body having side and end walls in which partitions are used to define an interior developing area. and to define with the end walls labyrinth channels for the introduction of fluid into the developing area.
  • a cover slidable over the body, is provided in which inlet openings is provided for the fluid, aligned with the labyrinth channels.
  • the cover has side walls. and they as ell as the side walls of the body are provided with cooperating means allowing the cover to slide-over the body and to engage tightly with it.
  • the undersurface of the cover is formed to provide a fluid and light proof seal with the upper edges of the body walls.
  • a stirring device is located in light proof manner in the cover. to agitate the fluid in the developing space.
  • the stirring system is formed by a plate made of the flexible material located in a recess formed in the bottom surface of the cover.
  • the plate is attached firmly at one end to the dover and is provided with a pushbutton passing through an opening in the cover which is surrounded by a dish-like housing provided with an annulus having increased peripheral edge above the upper surface of the cover.
  • the stirrer plate may be connected with the push butt0n by means of a pin and with a spring to increase flexibility and insure normal closing of the plate.
  • Each of the inner labyrinth walls may be provided with at least one finger-like clasp positioned so as to point towards the bottom of the body to grasp the sheet material. Spacing inserts are freely positioned in the developing area of the body which are made of a porous material, such as a synthetic or plastic mesh, allowing one or more sheets of photographic material to be developed at once.
  • FIG. 1 represents the tank body with the removable cover in an exploded view
  • FIG. 2 is a longitudinal section through the tank body with the cover in place
  • FIG. 3 is a longituidnal section through the tank showing the inserted spacing inserts and the photographic material, and a modified cover;
  • FIG. 4 is a view of the tank in the transverse crosssection
  • FIG. 5 is a view of the tank showing a modified method of engaging the cover and body.
  • FIG. 6 is a view of the tank showing still another modification of the cover and body.
  • the developing tank in accordance with the invention consists of two major parts, i.e., a parallelepiped body I and a slidable cover 2.
  • the body 1 has a rectangular shape and is formed with a bottom 18 in which there are provided longitudinal projections 181 preventing the photographic material 42 being developed from adhering to the bottom 18.
  • the outer surfaces of both of the longer sidewalls 11,12 are provided with guideways 111,121 which serve both to correctly bear and position the lid 2 and also to form a perfect light-proof seal for the de veloping space 4.
  • Both of the shorter walls, i.e, the rear wall 13 and the front wall 14 are provided with another inner wall or partition 131 and 14 which substantially doubles their thickness and which, in combination with the cross-walls, form a system of the labyrinths 15 and 16 which act to prevent light from penetrating into the developing space 4.
  • a pourin space 132 is formed, while similarly, between the front wall 14 and the inner partition I41 pour-in spaces 142, 143 are formed.
  • the front wall 14, and the inner partition 14], including the respective labyrinths 16, are of the same height, corresponding with that of both side-walls l1, 12.
  • the inner partition 131, including the associated labyrinths 15 is ofa lower height, than that of front wall 14, while the rear wall 13 is of a still lower height, neithe r of which attaining the height of the sidewall I l.
  • a pair of claws I9 are located on the inner partition 131, in direction towards the developing space 4, while a single claw I9 is located on the inner partition I4I directed towards the developing area 4. All of the claws I) are basically of the S shape pointing towards the bottom 18 of the body. The distance between the claws 19 on the inner partition 131 is greater than half of the width of the photographic material 42 being developed, while the claw I9 on the inner wall 14 is substantially in the center of the wall. Spacing inserts 41 made of synthetic or plastic mesh are loosely inserted in the developing space 4.
  • the cover 2 is provided with grooves 221 and 231 which are drawn slidably on the guides 111 and 121.
  • the upper wall 21 of the cover 2 is provided with the pour-in opening 213, 214, 215 located in its extreme end sections 24 and 25.
  • the openings empty respectively in pour-in spaces 142, 143, 132 formed between the inner and outer front and rear walls.
  • the thickness of the cover 2 is not uniform, but it is made to vary cascade-like, so that the greates thickness is in the space above the rear wall 13 and the smallest thickness is above the front wall 14.
  • the edge 241 between the rear section 24 and the middle part 25 of the cover 2 is of the same shape as the outer surface of the inner wall 131 so that after drawing or pushing the cover 2 on to the body 1 it bears against the inner walls and seats over the entire surface.
  • the edge 251 between the middle part 25 and the front edge 26 of the cover 2 is formed so that its edge will bear and seat with its full surface on the inner partition 141. In this manner penetration of and undesirable disturbing light, into the developing space 4, is prevented.
  • a stirring system 3 formed basically by a flat flexible plate 31 placed in a corresponding slot 216 formed in the lower surface 212 of the cover. The plate 31 is fastened, with screws 32, to the bottom surface 210 of the cover 2.
  • a pushbutton 33 is provided, which passes through an opening 27 in the cover 2, approximately in the middle of the plate 31.
  • the top of the push button 33 extends till above the upper surface 211 of the cover2 into a cupshaped deepended part 28 provided with an increasing peripheral edge 29, extending above the surface 211.
  • the cover 2 is placed with its grooves 221 and 231 on the guideways 111 and 121 made in the side walls 11 and 12 of the body 1.
  • a perfectly light-proof connection of the cover 2 with the body 1 is assured.
  • this position is secured against inadvertant pushing-out of the cover by a projection 17 formed in the upper part of the front wall 14 which engages with a cut-out 217 made on the bottom surface 210 of the cover 2.
  • the cover 2 is removed from the body 1 by sliding it off. This exposes the developing space 4, in which individual sheets of photographic material 42 may then be inserted. This insertion proceeds in dark surroundings. Each sheet is separated by a spacing insert 41 to provide alternate layers of sheets and inserts. Thus perfect access of the developing solution to all of the sensitive portions of the layers is assured.
  • Each of the sheets of the photographic material 42 is held by a spacing insert 41 in such a manner that the upper spacing insert is retained by the points 191 of the clamps 19 insuring both the correct position of the sheets in the developing space 4 and preventing their undesired movement in a direction towards the cover 2.
  • the clamp 19 prevents the sheets from being engaged by the slidable cover, even with a large quantitity of photographic material present.
  • the cover 2 is slid onto the body 1 and is secured against being pushed out by engaging the projection 17 into the slot 217. Further process of the photographic material may thereafter be performed at the full daylight.
  • the developing solution is poured into the pour-in spaces 142, 143 or 132 through the pour-in openings 213, 214 or 215 from which it flows into the actual developing space 4.
  • the plate 31 of the stirring device 3 is actuated into oscillatory or vibrating motion and the solution is effectively stirred.
  • the above mentioned construction of the developing tank is not the only possible solution within the concept of the present invention. Further design modifications are possible, which, for example, may consist, first of all, in differing variations in the form of labyrinth, and in a differing system of drawing the cover on the body 1, as shown for example in FIGS. 5 and 6.
  • the cover 2 is positioned in such a manner that grooves 221, 231 may be formed in the side walls '11-, 12 while the cover 2 is provided with the corresponding guideway 111, 121, 121.
  • Similar solution is shown in FIG. 6 with the difference that the guideway 111, 121 and the grooves 221, 231 are separable also in the direction perpendicular to the bottom 18 of the body 1 while in the preceding case is was separable only in the direction parallel to the bottom 18.
  • the plate 31 is connected with the pushbutton 33 by a pin 34 bearing a helical spring 35. As a result, a more reliable elasticity of the plate 31 is achieved.
  • the light-proofing of the pushbutton 33 may be solved in other ways, as well as the gripping of the photographic material, and the spacing inserts 42 in the developing space 4.
  • the present tank guarantees a perfect developing of one or more pieces of the flat photographic materials and it is, therefore, especially suited for mass developing process. It may serve not only for the amateur purposes, but for the professional ones as well as when such a mass developing process means substantial savings of the developing time.
  • a photographic developing tank comprising a parallelepiped body having side and end walls, a pair of interior partitions extending between said side walls spaced from each other to define a developing area within said body and spaced respectively from each of the end walls to define labyrinth channels at each end of said body communicating with said developing area, a removable cover for said body, having openings aligned with said labyrinth channels for introduction and removal of fluid, said cover and said body having cooperating means for maintaining said developing area light-free, and a systemfor stirring, comprising an elongated, flexible plate secured at one end to the lower surface of said cover and having its other end extending over said developing area, an actuating button in contact with said plate, said aeuating button passing through a hole in said cover, said hole being surrounded by an annular flange forming a disk shaped recess for said button.
  • the developing tank according to claim 1 including spacers loosely inserted within said developing area for supporting photographic sheets to be developed, said spacers comprising a plastic mesh body adapted to permit circulation of fluid within said area.
  • the developing tank according to claim 1 including means mounted on said partitions and extending into said developing area for grasping photographic sheets located in said developing area.
  • said grasping means comprise at least one resilient claw mounted on the upper edge of said partion and extending toward the bottom of said body.
  • a photographic developing tank comprising a parallelepiped body having side and end walls, interior partitions extending between said side walls spaced from each other to define a developing area within said body and spaced respectively from each of the end walls to define labyrinth channels at each end of said body communicating with said developing area, and a cover for enclosing said body having openings aligned with said labyrinth channels for the introduction and removal of fluid, said cover having side walls adapted to depend adjacent the sidewalls of said body, and to be slidable over said body from one end to the other, said side walls of said body and cover having cooperating means for slidably engaging said body in closed condition, the lower surface of said cover having means engaging the upper edges of said side and end walls and said partitions to seal said body against passage of fluid and light.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
US466527A 1973-05-14 1974-05-03 Daylight developing tank Expired - Lifetime US3903540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS3396A CS161157B1 (xx) 1973-05-14 1973-05-14

Publications (1)

Publication Number Publication Date
US3903540A true US3903540A (en) 1975-09-02

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ID=5373887

Family Applications (1)

Application Number Title Priority Date Filing Date
US466527A Expired - Lifetime US3903540A (en) 1973-05-14 1974-05-03 Daylight developing tank

Country Status (7)

Country Link
US (1) US3903540A (xx)
JP (1) JPS5033837A (xx)
CS (1) CS161157B1 (xx)
FR (1) FR2230001A1 (xx)
IT (1) IT1012304B (xx)
NL (1) NL7406404A (xx)
RO (1) RO74010A (xx)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157868A (en) * 1977-06-20 1979-06-12 Samuel Needleman Photographic processing tray
US4283134A (en) * 1980-04-24 1981-08-11 Eastman Kodak Company Film pack
US4492447A (en) * 1981-10-02 1985-01-08 Paterson Product Ltd. Apparatus for developing photographic material
US4515468A (en) * 1983-03-25 1985-05-07 Phase One Products, Corp. Combined photographic enlarger and print developing tray
US4518240A (en) * 1983-07-25 1985-05-21 Phase One Products Corporation Photographic print making and developing tray assembly
US4645324A (en) * 1985-10-07 1987-02-24 501 Daylab, Ltd. Photographic print making and developing tray assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US738665A (en) * 1903-02-14 1903-09-08 Cornelius Jerome Simmons Photographic developing apparatus.
US1602931A (en) * 1924-05-16 1926-10-12 Pope John Russell Apparatus for developing photographic plates and the like
US3465664A (en) * 1965-11-29 1969-09-09 Austin Anthony Bochman Developing tray for colour positive photographic papers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US738665A (en) * 1903-02-14 1903-09-08 Cornelius Jerome Simmons Photographic developing apparatus.
US1602931A (en) * 1924-05-16 1926-10-12 Pope John Russell Apparatus for developing photographic plates and the like
US3465664A (en) * 1965-11-29 1969-09-09 Austin Anthony Bochman Developing tray for colour positive photographic papers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157868A (en) * 1977-06-20 1979-06-12 Samuel Needleman Photographic processing tray
US4283134A (en) * 1980-04-24 1981-08-11 Eastman Kodak Company Film pack
US4492447A (en) * 1981-10-02 1985-01-08 Paterson Product Ltd. Apparatus for developing photographic material
US4515468A (en) * 1983-03-25 1985-05-07 Phase One Products, Corp. Combined photographic enlarger and print developing tray
US4518240A (en) * 1983-07-25 1985-05-21 Phase One Products Corporation Photographic print making and developing tray assembly
US4645324A (en) * 1985-10-07 1987-02-24 501 Daylab, Ltd. Photographic print making and developing tray assembly

Also Published As

Publication number Publication date
DE2423042B2 (de) 1976-04-01
NL7406404A (xx) 1974-11-18
IT1012304B (it) 1977-03-10
JPS5033837A (xx) 1975-04-01
RO74010A (ro) 1981-01-30
FR2230001A1 (xx) 1974-12-13
CS161157B1 (xx) 1975-06-10
DE2423042A1 (de) 1974-11-21

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