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Publication numberUS1117035 A
Publication typeGrant
Publication dateNov 10, 1914
Filing dateJun 30, 1913
Priority dateJun 30, 1913
Publication numberUS 1117035 A, US 1117035A, US-A-1117035, US1117035 A, US1117035A
InventorsCharles George Green
Original AssigneeCharles George Green
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Portable developing-cabinet.
US 1117035 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




1, 1 1 7,035. Patented Nov. 10, 1914.




Specification of Letters Patent.

Patented Nov. 10, 1914.

Application filed June 30, 1913. Serial No. 776,618.

To all whom it may concern:

Be it known that I, CHARLES GEORGE GREEN, a subject of the King of Great Britain, and resident of the city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Portable Developing-Cabinets, described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the present invention are, to provide a portable cabinet for the use of photographers in developing negatives, loading holders and such other purposes as may be required where a proper dark room is not available and which is iarticularly adapted to being carried around, and particularly designed for the use of amateurs.

A further object of the present invention is to devise a portable developing cabinet which may be manufactured and sold at very low cost and which is of very light weight and occupies the smallest possible compass convenient for carrying.

The principal feature of the invention consists in the novel construction and arrangement of parts, whereby a readily collapsible light proof casing is formed.

In the drawings, Figure 1 is a perspective view of my improved developing cabinet, one of the end coverings being removed therefrom. Fig. 2 is a perspective view showing the cabinet set up ready for use. Fig. 3 is a vertical longitudinal sectional view of one end of the cabinet shown ready for use. Fig. 1 is a cross sectional view of the cabinet collapsed.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 is a rectangular shaped casing formed from a sheet of corrugated cardboard packing material comprising outer and inner fiat sheets of cardboard material 2 and 3 with an intermediate corrugated sheet 4 all united together. The sheet is bent longitudinally of the corrugations of the center strip into the rectangular shape desired and the edges are united preferably in the bottom side 5, a lap joint being made to form a rigid and a light proof joint.

6 are strips of thin sheet metal secured to the inner side of the bottom 5 adjacent to the ends of the casing having a raised central portion 7 in which are pivotally held the rectangular shaped wire loops 8 which are formed to fit snugly against the inner walls of the casing to hold it from collapsing. These loops are arranged so that when it is desired to collapse the casing they may be swung downwardly flat against the bottom and the sides of the easing will then fall in together as illustrated in Fig. 4.

9 are angle shaped strips preferably formed of thin sheet metal and secured to the outer sides of the casing 1 adjacent to the ends and forming the outwardly proj ecting flanges 10. The strips 9 are formed at the ends to allow two of the corners of the casing to flatten out and the other meeting ends are mitered to add rigidity to the casing when in its extended position.

11 are caps formed of a suitable flexible fabric shaped to fit over the ends of the casing 1 and to extend around the flanges 10 being held in place at each side of the flanges by the elastic bands 12 and 13. The arrangement of the flanges insures a thoroughly light proof connection between the end caps and the casing, a double seal being provided at each side of the flange.

11 are circular shaped holes cut in the back 15 of the casing 1 in which are secured the sleeve members 16 formed of a suitable light proof fabric, said sleeves being adapted to encircle the arms of the operator and having suitable bands secured thereto.

17 and 18 are openings in the top and front sides of the casing 1 in which are secured in a light proof joint sheets of ruby glass or corresponding material. The peculiar material of which the casing 1 is formed allows of the securing of the glass or other colored sheets in said openings in a light proof joint as the said material is formed with a double wall and a lap joint may be made very readily. By providing the openings 17 and 18 I allow provision for ample light within the casing and also that the operator may follow clearly the operation of his hands within the casing when inserted through the holes 14.

19 is a small opening arranged in the back 15 between the holes 14 and also covered with a ruby light. This is provided so that the operator may look through a negative by holding the negative between said hole and the opening in the front s1 e.

20 is a small bracket secured to the front side of the device and adapted to receive a Wire bracket member 21 which carries a candle holder 22 at its outer end so that the operator may Work in a dark place if desired or do any developing by night When other lighting means for his cabinet are not available.

Iam aware that various forms of portable or collapsible developing cabinets have been devised but the main feature of the present invention consists in its simplicity and durability of construction, its light Weight and the manner in Which it may be collapsed and carried with convenience.

A further and most important feature is that the cheapness of construction enables it to be placed upon the market at a very moderate price.

\Vhat I claim as my invention is 1. A portable developing cabinet, formed of a sheet of stiff board material, folded to form a rectangular open ended casing having the meeting edges joined to form a light proof joint, means for holding the casing from collapsing laterally, rectangular shaped caps adapted to close the open ends of said casing in a light proof joint, ruby lights arranged in the sides of said casing, and light proof sleeve members connected to arm holes in one side of said casing.

2. A portable developing cabinet, formed of a length of stiff board material folded to form a rectangular open ended casing the bends thereof being flexible, rectangular shaped metal loops pivotally secured to the inner wall of one of the sides of said casing adjacent to the ends adapted to hold the sides from collapsing laterally, light proof caps of flexible material adapted to close the ends of said casing, sleeves of light proof material connected to the arm holes in one side of said casing, and ruby lights arranged in the sides of said casing.

3. A portable developing cabinet formed of stiff board. material folded to form a rectangular casing open at the ends, means for holding the casing to its rectangular shape, metallic flanges rigidly secured to the outer sides of said casing adjacent to the end, caps of light proof fabric adapted to close said ends and to extend over said flanges, flexible bands encircling the inner ends of said caps at each side of said flanges to secure said caps in place and form a light proof joint, ruby lights arranged in the sides of said casing and light proof sleeve members extending from arm holes in one one side of said casing.

Signed at the city of Toronto, Ontario, Canada, this 24th day of June, 1913.




Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G,

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7841786 *Apr 14, 2008Nov 30, 2010Richard Clark Howell BeitmanDigital camera sensor cleaning and lense changing case
US20090255845 *Apr 14, 2008Oct 15, 2009Richard Clark Howell BeitmanDigital camera sensor cleaning and lense changing case
U.S. Classification396/592
Cooperative ClassificationG03D3/10