US1034968A

US1034968A - Photographic enlarging apparatus.

Info

Publication number: US1034968A
Application number: US62997311A
Authority: US
Inventors: Edward Broom
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-05-29
Filing date: 1911-05-29
Publication date: 1912-08-06
Anticipated expiration: 1929-08-06

Description

E. BROOM. PHOTOGRAPHIC ENLARGING APPARATUS.

Patented Aug. 6, 1912.

` 2 SHEETS-SHEET 1.

APPLICATION FILED MAY 29.1911.

E. BROOM. PHOTOGRAPHIC ENLARGING APPARATUS.

APPLICATION FILED MAY 29.1911.

Patented Aug. 6, 1912.

2 SHEETSSHEET 2 WZ-zesls EDWARD BROOM, 0F GLASGOW, SCOTLAND.

PHOTOGRAPHIC ENLARGING APPARATUS.

lSpecification of Letters Patent.

Patented Aug. 6, 1912.

Application med May 29, 1911. serial No. 629,973.

To all whom it may concern: ,i Be it known that I, EDWARD BRooM, a subject of the King of Great Britain, residing at Glasgow, Scotland, have invented certain new and useful Improved Photographic Enlarging Apparatus, of which the following is a specification.

' This invention relates to photographic enlarging apparatus.v At present .it is usual to make such apparatus with a long and horizontally arranged frame which carries the easel, and the lantern is so arranged relatively to the frame that its light shines horizont-ally on the condenser and the negative. rIhe result of this arrangement is that a considerable amount of floor space is taken up.

Under my invention I construct the apparatus with a vertically arranged frame and the lantern is-also so .arranged that its light shines downwardly on to the condenser and the negative. Owing to this vertical arrangement very little floor space is taken up, and, moreover, the parts of the apparatus are so made as to be capable of ready manipulation from one position.

The lantern is carried in such a manner that it can be readily Vadjusted Avertically by means of screw or other gear while the lens is also capable of vertical adjustment by means of screw or other gear.

l In carrying out the invention I, preferably, construct the apparatus with a vertical frame for carrying the easel, this frame being open at two sides thereof and also having an opening at the top, and, at op# f posite sides ofthis latter opening, and at right angles to the top of the frame I arrange two vertical uprights or Supports, one of which serves to support the lantern whose light shines downwardly through the opening at the top of the frame and strikes upon the easel which latter may be fixed in anyv suitable manner and at any desired point within its frame, the paper to be printed being merely laid upon the easel. The lantern which may be lighted by inverted incandescent gas or other suitable light or lights, has the usual air outlet at the top, the air inlets being provided with/a light baie at three sides thereof and the remaining side having a rectangular guide frame attached thereto. This rectangular guide frame is provided with"f projections which work in suitable guides lfixed on to one of the vertical supports. A screw spindle, rotatably mounted in the top o f one of the Supports,

engages with a fixed nut provided on the rectangular guide frame carrying the lantern so that, when the spindle is rotated, the nut is raised or lowered thereby raising or lowering the lantern. The lantern is provided, at its lower end, with a frame carrying ground glass, which frame is made removable so that the glass may be readily cleaned. Connected by bellows, and fixed under the lantern, to theI two vertical supports, isa box divided by a horizontal partition, the top, bottom and said partition being provided each with a hole or opening so that the light can shine downwardly on to al plano-convex or other suitable condenser carried in the upper portion of the said box, the lower portion of the saidv box carrying the usual negative frame. Under this box and connected thereto by means of bellows, is a projecting lens frame, at one end of which and at right angles thereto is attached a slide working on a guide, on the second upright support, said projecting lens frame being raised and lowered by means of a screwed spindle, attached to the upper end of the slide, and working in a fixed nut on the box.

The projecting lens is provided with a yellow cap to which is attached one end of a lever fulcrumed on a projection on the lens frame and whose other end is provided with a balance weight or equivalent arrangement so that the cap can be readily held in either its, closed or open position.

The invention may also be applied to the ordinary frame for enlarging apparatus, .the said frame being placed vertically instead of horizontally, and secured against a wall or partition, or fixed in any suitable manner to the floor or ground. The easel, which is supported by brackets or the like, lies horizontally, and may be vfixed at any suitable point on the frame by means of thumb screws or otherwise. The lantern, condenser box, and projecting lens frame are carried by means of two vertical su ports which rest on suitable guides provi ed on a horizontal shelf which projects from the frame. The vertical supports carrying the lantern, condenser box, and projecting lens frame may be moved by band horizontally along the guideways or by means of screw planatory sheets of drawings Whereon I have shown, by way of illustration or example, two methods of carrying out my invention.

' is a side elevation partly in section. Fig. 6

is a plan view. I

The same reference numerals wherever repgeated indicate the same or similar parts.

Referring to Figs. 1 to 3 of the drawings, I construct the apparatus with a vertically arranged frame 1 provided with series of projections 2 on which the easel 3 rests. The said frame 1 is open at two sides and is provided with an opening 4 at the top thereof, through which two vertical supports 5, 5, project, the said supports being supported by means of projecting. strips 6, fixed at any suitable part of the

vertical shelves

5, 5. lThe lantern 7, which is, preferably, lighted by means of an inverted incandescent mantle 8 to which gas is led by a pipe 7, has the usual air outlet 9 at the top, the air inlets 10 vprovided with a light baille 11 are located at three sides thereof, the remaining side having a rectangular guide frame l2 attached thereto. This rectangu- .lar guide frame 12 is provided with projecting parts 13 which work `in suitable guides 14 fixed on to the vertical support 5. A screw spindle 15, rotatably mounted in the top of the support 5, works through a fixed nut 16 provided onr` the rectangular guide frame 12 which latter carries the lan- .terii 7, so that, when the spindle 15 is rotated, the nut 16.is raised or lowered thereby raising or lowering the lantern. The lantern is provided with a removable cover 17, a sliding door 18, and a frame 19a carrying ground glass 19 which frame is slidably and removably fitted in the bottom of the lantern, so that the glass may be readily cleaned.

Connected by bellows 20, and fixed under the lantern 7, to the two

vertical supports

5, 5a, is a box 21, divided by a horizontal partition 22, the top, bottom, and said partit-ion. beingr provided with openings 21al so that the light can shine downwardly on to a plano-convex or other suitable condenser 23 carried inthe upper portion 24 of the box 21, the lower portion 25 of the box 21 carrying the usual negative frame 26. Under the box 421 and connected thereto by means of bellows 27 is a projecting lens frame 28 at one end of which and at right angles thereto, is attached a slide 29 working on a guide 30 on the second vertical support 5a, said projecting lens frame 28 being raised and lowered by means of a screwed spindle 31 rotatably attached to the upper end of the slide, and working in a fixed nut 32 on the box 21. The projecting lens 33 is provided with a yellow cap 34 which is attached to one end of a lever 35 fulcrumed on a projection 36 on the lens frame 28 and whose other end is provided with a balance weight 37 so that the cap 34 can be readily held in either its closed or open position. The sensitized paper or plate to be exposed can be simply laid on the easel 3, no fastening devices being necessary. The projections 2 on the frame 1 are spaced so that varying degrees of enlargement can be obtained without special adjustment. Two

removable shelves

38 and 39 respectively, resting on the projections 2 of the frame 1, are arranged below the easel 3, and are provided with

dishes

40 and 41 in order that the paper or platde may also, if desired, be developed and Referring to Figs. 3 to 6 of the drawings I apply my invention to the ordinary frame 42 for enlarging apparatus, the said frame 42 being placed vertically instead of horizontally and may be secured against a wall or partition 43 by means of a staple 44 and wedge 45 or other suitable arrangement. The easel 46, which is supported by means of bracket arms 47 or the like, lies horizontally, and may be fixed at. any suitable position on the frame 42 by means of thumb screws 48. I provide a suitable horizontal shelf 49 near t-he top of the frame, this shelf being supported by means of stays 50 or other suitable arrangement, and having an opening 51 which extends to the front of the shelf so as to allow the

vertical supports

5, 5a, to be moved horizontally. The said vertical supports 5, 5a, rest on suitable guides 52 which are arranged parallel to each other and tothe sides of the opening 51.

The lantern 7 is of the same construction as that shown at Figs. 1 to 3 and may be lighted by an inverted incandescentgas mantle. Heat baffle plates 58 are provided on the lantern in orderthat the woodwork will not be unduly heated. The screw spindle 15 which is rotatably mounted in the bottom of the box 21 extends upward and engages with a fixed nut 16 provided, as before, on the reet-angular guide frame which carries the lantern, so that, when the spindle 15 is rotated, the nut 16 is raised or lowered thereby raising or lowering the lantern. Under the box 21 and connected by means of bellows 27 54 on the second vertical support 5, said projecting lens frame 28 being raised and lowered by mea-ns of a screwed spindle 31 i rotatably attached thereto, said spindle working in a fixed nut 32 on the box 21. The `vertical supports 5, 5a, carrying the lantern 7, condenser ,box 21 and projecting lens frame 28 may be moved horizontally along the guidewa s 52 by means of a screw spin le 55 rotatab y mounted in one end to the frame 42 and extendin parallel to the guides 54. A nut 56 fixe to the `vertical support 5 engages with the screw spindle 55, so that when it is desired to take a large enlargement, the spindle 55 is rotated so as to cause the

vertical supports

5, 5, carrying the lantern 7, condenser box 21 and projecting lens frame 28 to be moved outwardly on the shelf 49.` Any suitable and well known means may be provided for raising or lowering the light inside the lantern.

Having now fully described my invention, what I claim and desire to secure by Letters Patent is 1. A vertical photographic enlarging apparatus comprislng a lantern the light from which is directed downward, a supporting frame for the lantern, means fitted to the lantern for concentrating the light on the image to be enlarged, means fitted in connect-ion with the lantern for adjusting the samevertically, vertically adjustable means for enlarging the image and horizontal adjustable means on the supporting frame for holding a sensitized surface.

2. A vertical photographic enlarging apparatus comprising a lantern the light from which is directed downward, a supporting frame foi* the (lantern, means fitted to the lantern for concentrat-ing the light on the image to be enlarged, means fitted in connectlon with the lantern for adjust-ing the same vertically, vertically adjustable means for enlarging the im e and internal projections `on the suppo ing frame for holdlng a sensitized surface.

3. A vertical photographic enlarging apparatus comprislng a lantern the light from which is directed downward, a supporting frame for the lantern, means itted to the lantern for concentrating the light on the image to be enlarged, means fitted in connection with the lantern for adjusting the same vertically, vertically adjustable means for enlarging the image, a pivotally arranged balanced cap fitted in connection paratus comprising a lantern the light from which is directed downward, a supporting frame for the lantern, means fitted to the lantern for concentrating the light on the 'image to be enlarged, guides in connection with the frame for the lantern, screw means for adjusting the lantern, internal projections on the su porting frame arranged at varying interva s, removable shelves adapted to be fitted on the external projections for holding a sensitized surface, and means adjustably fitted in connection with the lantern for projecting the image on the sensitized surface. j

5. A vertical photographic enlarging apparatus compr1sing a lantern the lightfrom which is directed downward, a frame for supporting the lantern, a condenser connected with the lantern for concentrating the light on the image to be enlarged, means tted in connection with the lantern for adjusting the same vertically, a lens adjustably fitted in connection with the lantern for enlarging the image, a pivotally arranged balanced cap fitted in connection with and for the enlarging lens, and means for supporting a sensltized surface below the enlarging lens.

6. A vertical photographic enlarging4 apparatus comprislng a lantern-body, a supporting frame for the lantern-body, a removable cover for the body, a door for the body, an opening in the bottom of the body, a bellows tit-ted to the bottom of the body, a condenser fitted in connection with the bellows forv concentrating the light on the image to be enlarged,a negative frame fitted in connection with said lens, an adjustable lens fitted in connection with the negative