US790532A - Photographic developing apparatus. - Google Patents

Description

No. 790,532. PATENTED MAY 23, 1905. G. H. SHAW.

PHOTOGRAPHIC DEVELOPING APPARATUS.

APPLICATION FILED JAN. 3. 1905.

UNITED STATES Patented May 23, 1905.

CHARLES H. SHAlV, OF NElV YORK, N. Y.

PHOTOGRAPHIC DEVELOPING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 790,532, dated May 23, 1905.

Application filed January 3, 1905. Serial No. 239,353-

To all whom it may concern.-

Be it known that 1, CHARLES H. SHAW, a citizen of the United States of America, residing in New York city, borough of Brooklyn, county of Kings, and State of New York,

have invented certain new and useful Improve:

ments in Photographic Developing Apparatus, of which the following is a specification.

My invention relates to photographic developing apparatus, and particularly to portable apparatus adapted for the development of photographic films.

An apparatus constructed in accordance with my invention consists in the combination, with a coilable strip adapted to receive and support a film to be developed and a support for said strip, of an inclosing cylinder therefor comprised in two coengaging portions, whereby ready access may be had to the interior for the purpose of insertion and removal of the strip, support, and film, said cylinder having means permitting the admission and discharge of developing fluid and the like when the cylinder is closed, while at the same time excluding actinic rays of light.

My invention also consists in a certain improved form and construction of the coilable strip whereby the same is formed of a single combination of parts, as will hereinafter more fully appear.

I Will now proceed to describe an apparatus embodying my invention and will then point out the novel features in claims.

In the drawings, Figure 1 is a view in central vertical longitudinal section through an apparatus embodying my invention. Fig. 2 is a top View of the same with one of the cylinder-casing portions removed. Fig. 3 is a view in perspective of the supporting-spool, the coilable strip, and a film supported thereby. Fig. L is a view in side elevation of the spool with the coilable strip uncoiled and disclosing the inner end thereof where connected to the spool and also showing the means for connecting the inner end of the film to the spool. Fig. 5 is a view in side elevation of the device ready for use, but showing the same as without the discharge illustrated in Fig. 1.

My device comprises three main portions an inclosing cylinder or casing, a coilable strip, and a spool upon which the same is supported.

The casing is here shown as a cylinder divided into two portions 1 and 2, the same provided with coengaging portions whereby they may be connected together, as shown, to form an inclosing casing and may be separated to permit ready access to the interior for the purpose of removing and replacing the parts contained therein. The upper portion 2 of the cylindrical casing is provided with a funnel-shaped inlet 3, through which liquid may be admitted to the interior of the apparatus when the cylinder is closed, and a light-guard 4 is provided to prevent actinic rays of light from entering through the said inlet while permitting the liquid to flow freely around its edges. The light-guard 4 also acts as a support for a centering-stud 5, by which the spool may be centered. A corresponding centering device 6 is also carried by the cylindrical casing portion 1.

In Fig. 1 the cylindrical casing portion is shown as provided with a discharge 17, while in Fig. 5 this discharge is dispensed with, and the inlet 3 may then serve as both inlet and discharge.

The coilable strip 8 comprises an integral strip of flexible material provided with integral teeth or projections 9 adjacent its side edges. These teeth 9 are conveniently A- shaped, so as not to obstruct the passage of fluid when the strip is coiled upon itself. The strip may be of any suitable material, but is preferably a strip of molded rubber fabric. In constructing the strip of a single integral portion I avoid the trouble incident to creeping where the projections or teeth are formed in a separate piece, and rubber or rubber fabric I have found to effectually withstand the chemicals employed for developing and fixinganegative. By rubber fabric I mean to be understood as referring to rubber or rubber compound molded with fabric, the fabric employed preventing distortion.

The spool comprises a core 10, hollow or otherwise, as may be desired, and side flanges 11. The side flanges 11 are open, so as not to obstruct free passage of liquid, and may conveniently comprise spider-arms 12 and rings 13, mounted upon the ends thereof. The end flanges will, so constructed, guide the side edges of the strip and the film when being coiled upon the spool, but will not obstruct the passage of liquid to the space between, the coils of the strip. The flanges have holes 14 for receiving the centering devices5 and 6, the same being shown in engagement in Fig. 1. The inner end of the coilable strip is secured to the core 10, as by clamps 15, (see Fig.4 and a rod 16, arranged between and secured to the flanges 11, serves as a means for receiving and retaining the inner end of film to be operated upon.

The apparatus is employed as follows: The two parts of the cylindrical casingbeing separated and the spool and strip thereon removed, the strip is entirely unwound until the rod 16 is exposed. One end of the film is then slipped under the rod and bent back upon itself. The film is then laid face upward upon the back (or plain side) of the strip 8, and the strip and film are then together wound or coiled upon the spool, as shown in Fig. 3. When entirely wound, they are placed in position within the cylindrical casing, the two portions thereof being then assembledv and coengaged. It will of course be understood that theforegoingmusttake place in a dark room, change-bag, or the like and that my device is in no sense a portable dark room, but only a developing apparatus. The device is now ready to receivethe developing solution, which may be introduced through the inlet 3; If the discharge 17 be employed, this must first be stoppered to. prevent the liquidflowingout. Thedevelopingliquid will penetrate to every part of the film, the teeth or projections 9 holding the convolutions apart, whereby a volutc space the lengthv of the film is formed, admission thereto being freely gained through the open spool-flanges and be tween the-teeth or projections 9. After the film has been acted upon by the developing fluid the same may be drained off through' the discharge 17,.if employed, or out through the inlet 3, if no separate discharge be em-,

ployed, and other liquid introduced to fix and wash the film. When fixed, the apparatus may be opened and the film removed for further washing, if necessary, and for drying.

I claim- 1. In a photographic developing apparatus, the combination with a cylindrical containing vessel having separable coengaging portions, whereby a spool may be inserted into and re-. moved from said casing, of a spool and a strip coilable thereon for receiving and supporting a photographic film, said strip having teeth or projections adjacent its side edges with intervening spaces for the passage of liquid between the coils, said spool with said strip thereon occupying substantially the entire space inclosed by said casing.

2. In a photographic developing apparatus, the combination with a cylindrical containing vessel having axially-separable coengaging portions, whereby a spool may be inserted into and removed lengthwise from said casing, of a spool and a strip coilable thereon for receiving and supporting aphotographic film,

. said strip having teeth or projections adjacent its side edges with, intervening spaces for the passage of liquid between the coils, said spool with said strip thereon occupying substantially the entire space inclosed by said casing.

3. In a photographic developing apparatus,

the combination with a cylindricalv containing vessel having separable coengaging portions, whereby a spool may be inserted into and removed from said casing, one of said portions provided at its end head with an opening for admission of liquid, and a lightguard for preventing the admission of actinic rays, of a spool andia strip coilablethereon for receiving and supporting a photographic film, said strip having. teeth or projections adjacent its side edges with intervening spaces for the passage of liquid between the coils, said spool with said strip thereon occupying substantially the entire space inclosed by said casing.

4:. In a photographic developing apparatus, the combination with a cylindrical containing vessel having separable coengaging portions, whereby a spool may be inserted into and removed from said casing, of a spool and a strip coilable thereonfor receiving and supporting a photographic film, said strip having teeth or projections adjacent its side edges with intervening spaces for the passage of liquid betweenthe coils, said spool withsaid strip thereon occupying substantially the entire space inclosed by said casing, said apparatus provided with centering means for opposite endsof the spool, and adjusted by the act of closing the vessel. 1

5. A coilable strip for photographic developing apparatus of the character described, comprising an integral strip of rubber fabric provided with A-shaped teeth or projectionsadjacent its side edges.

6. In a photographic developing apparatus,

the combination with a cylindrical containing vessel having separable coengag'ing portions, spool with said strip thereon, occupying suband a spool having open flanges, of a coilable stantlally the entire space inclosed by the cas- I strip therefor having teeth or projections ading, said casing provided with means for inacent its side edges, whereby, When coiled troducing liquld endwise therein.

5 upon the spool, a volute space is formed to CHARLES H. SHAW.

which free access may be had by liquid With- \Vitnesses: in the casing, through the intervening spaces D. HOWARD HAYWOOD,

between the said teeth or projections, said O. F. CARRINGTON.

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