US1064678A - Guide for developing-tanks. - Google Patents

Description

h A A I F. M. ALEXANDER.

GUIDE FOR DEVELOPING TANKS.

APPLICATION FILED JULY 24, 1912.

Patented June 10, 1913..

INVENTOR M Var/242% WW COLUMBIA PLANOGRAPH 26.. WASHINGTON, D. c.

UNITED STATES PATENT @FFTCE.

FRANK M. ALEXANDER, OF PITTSBURGH, PENNSYLVANIA.

GUIDE FOR DEVELOPING-TANKS.

Application filed July 24, 1912.

To all whom it may concern Be it known that I, FRANK M. ifLLFXAllDER, a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Guides for Developing-Tanks; and l do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to photograph plate developing tanks and has special reference to means for guiding the plates into their respective compartments in such tanks.

The object of my invention is to provide a cheap, simple and efficient form of guide for guiding the photographic plates into the proper places in a rack such as those used in the developing process to be placed in the developing tank, and a guide which can be attached and detached with ease and which can be made from ordinary sheet metal and stamped to the shape designed.

My invention consists, generally stated, in the novel arrangement, construction and combination of parts as hereinafter more specifically set forth and described and par ticularly pointed out in the claims. 7

To enable others skilled in the art to which my invention appertains to construct and use my improved guide for developing tanks I will describe the same more fully referring to the accompanying drawing in which- Figure 1 is a plan view of the plate rack showing the guide attached thereto. Fig. 2 is a cross-sectional view of the same on the line 22, Fig. 1, showing the guide in its first position. Fig. 3 is a cross-sectional view on the line 8-3, Fig. 1. Fig. at is an inverted plan view of the guide.

Like symbols of reference herein indicate like parts in each of the figures of the drawing.

As illustrated in the drawing my device comprises a carriage plate 1 formed in the present instance from a flat sheet of metal such as brass or other sheet metal and having one end of the same overlapped at 2 in order to make a sliding fit with the flange 3 on the side of the developing rack 4. This rack 1 as shown on the drawing is of skeleton form having side plates 5 which are formed so as to make grooves 6 on the inner face of the rack while the plates are supported by rods 7 which are bent around at the top of the same to form the horizontal supports 8 and are fastened at the bottom Specification of Letters Patent.

Patented June 10, 1913.

Serial No. 711,237.

of the same at the base 9. The grooves in the side plates 5 constitute seats for the photographic plates and are usually six in number and two photographic plates are supposed to be placed edgewise in the corresponding grooves in the said plates, but as this work is all done in the dark or with a very faint ruby light it often happens that the plates are not placed in the corresponding grooves but would for instance be placed with one of their side edges in the first groove 6 on the one side plate 5 and their other side edges in the second groove 6 on the other side plate. his caused a great deal of confusion and the photographic plates are likely to become scratched or otherwise injured in being thus placed unevenly in the rack t or in trying to readjust the same.

The guide 1 is provided on one side of the same with lips 10 and on the other side with lips 11 which extend downward and are adapted to rest alternately against the horizontal supports 8 and 8 in order to limit the motion. of said guide as hereinafter explained. The other end of the guide 1 is provided with a pair of small flanges 12 which bear against the edge of the flange 3 in the side of the rack 4: while at the center of the said end is an extension 13 which extends out over the flange 3 and at the center of which is pivoted a small circular disk 1% which has a flat cut-away portion 15 so that when said fiat portion is moved to a position parallel with the said end of the guide 1 it will pass over the flange 3 on the side of the rack 1. The disk 14% has a pressed out center 15 which is secured to the extension 13 by a rivet 16 or any other convenient means in order to allow the same to be rotated freely on said extension as hereinafter explained.

The face or body 1 of the guide 1 is provided with a series of longitudinal openings 17 forming guides so arranged that when said guide carriage is in engagement with the rack 1 the openings 17 will be directly above alternate corresponding grooves or seats in the said rack, 2'. 6., in case there would be six grooves in the rack 1 the number of openings would be three in the guide carriage and these would be directly over the first, third and fifth grooves or the sec ond, fourth and sixth grooves while intermediate portions of the carriage plate would block entrance to the other seats or grooves.

The openings 17 are formed by cutting the metal and turning up the edges of the same on either side ot the cut. to torm wings 15 which are curled around in order to eliminat any rough surfaces or edges and thus insure :1 pcrieclly smooth slide for the photographs without scratching or otherwise injuring the same. The distance between the lips 10 and 11 on the opposite sides of the guide 1 is just the distance between the outsides of the h rizontal sup ports 8 and 8 plus the width of one groove. This is to allow for the moving of the guide for filling the second. group of holes or grooves a'tter the first group has been loaded with photographic plates.

The operation of my improved guide for photo plate racks is as follows: The rack is placed in a position such as shown in Fig. 2 and the overlapped end is placed over the flange 3 cl said rack and the guide carriage is then dropped onto the rack so that the lips 10 and 11 extend on the outside of the horizontal supports 8 and 8 and the flanges 19 will extend over the flanges 3 on the rack. The small disk 141T is now rotated so that the circular part of the same will be turned toward the rack and will engage with the side plate 5 in order to make a sliding fit therewith. The guide carriage l is now pushed to a position where the lips 10 engage with or rest against the horizontal support 8 so that the openings 17 in the face of said guide carriage will be directly above alternate grooves or seats 6 in the side plates 5, just as shown in 2. The plates (4 are now dropped into their respective openings and rest at the bottom on the base 9 oi the rack a, as shown in Fig. 2, where the plates are shown in three of the grooves. When these grooves are loaded as shown the guide carriage l is pushed over and the rack t is tilted so that the guide carriage will move by its own weight until the lips 11 rest against the horizontal support 8'. This will allow the openings 17 in the face of the guide carriage or plate 1 to be directly above the unloaded grooves or seats 6 so that the photographer can then place the remaining photographic plates in such grooves and the rack will thus be entirely loaded and ready to place in the developing tank made to suit said rack after the guide has been removed.

It will be evident that with such a guide for the photographic plates it will be impossible to get the plates placed irregularly in the rack, 2'. 6., deposed in grooves not di rectly opposite each other as is very common at the present time where no guide is used. The wings 18 will also prevent the sensitive side of the plate from becoming scratched by the sharp or rough edges which would be present at the edges of the openings without the use of such wings.

It. is apparent that my improved guide can be made by punching and will. be very inexpensive on account of the cheapness ot the material and small amount of labor necessary to finish the same. it will also be very light, and can be attached and detachcd very rapidly, all of which will prove an advantage in its use in connection with developing tanks.

Various modifications and changes in the design and construction of my improved guide for photo-(leveloping tanks may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

What I claim as my invention and desire to secure by Letters-Patent isl. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when inserted edgewise therein, of a carriage provided with a plurality of plate guides correspondingly spaced with reference to the plate seats, said carriage being movable transversely oi? the latter between two positions in one of which its guides are in register with the respective units of one set of seats and in the other of which they are in register with the respective units of different set of seats.

2. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when inserted edgewise therein, ot' a carriage provided with a plurality of plate guides correspondingly spaced with reference to the plate seats said carriage being movable transversely of the latter between two positions in one of which its guides are in register with the respective units 01 one set of seats and in the other of which they are in register with. he respective units of a diitlerent set of seats, each set of seats being respectively composed of non-successively arranged units.

3. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when inserted edgewise there in, of a carriage provided with a plurality of plate guides correspondingly spaced with reference to the plate seats, said carriage being movable transversely of the latter between two positions in one of which its guides are in register with the respective units of one set of seats and in the other of which they are in register with the respective units of a different set of seats, each set of seats being respectively composed of units arranged alternately with respect to toe units of the other set.

4-. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when inserted edgewise therein, of a carriage provided with a plurality of plate guides correspondingly spaced with reference to the plate seats, said carriage being movable transversely of the latter between two positions in one of which its guides are in register with the respective units of one set of seats and in the otherof which they are in register with the respective units of a different set of seats, and means for centering the carrier in each of its two positions to insure alinement of the respective seats and guides.

5. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and re tain the plates when inserted edgewise therein, and opening at one end of the rack, of a carriage plate provided with a plurality of Seats forming plate guides correspondingly spaced with reference to the seats, said carriage being shittable transversely of the latter between two positions in one of which its guides are in register with the respective units or" one set of seats and in the other of which they are in register with the respective units of another set of seats and depending flanges on the carrier plate adapted to alternately engage opposite sides of the rack to center the carrier plate in its respective positions.

6. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when presented edgewise thereto, of av carriage shiftable on the rack and provided with a guide adapted to register with different seats therein, positive interlocking elements on the carriage and one side of the rack, respectively, and detachable interlocking elements on said parts at the other side of the rack.

7. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when presented edgevvise thereto, of a carriage plate shittable on the rack andv provided with a. guide adapted to register with diiterent seats therein, said guide being formed by a slot in the carriage plate having raised and outwardly or laterally curled side walls.

8. The combination with a photographic plate rack having a plurality of relatively spaced plate seats adapted to receive and retain the plates when inserted edgewise therein, of a carriage provided with a plurality of plate guides correspondingly spaced with reference to the plate seats, said carriage being movable transversely of the latter between two positions in one of which its guides are in register with the respective units of one set of seats and in the other of which they are in register with the respective units of a different set of seats, and portions on the carriage arranged to block entrance to the units of one set of plate seats while the guides are in register with those of the other set.

S). A guide for a photographic plate developing rack, comprising a movable plate having a series of parallel longitudinal openings within the same and adapted to register with alternate corresponding plate holding grooves in said rack, means for limiting the movementof said guide on said rack to insure said openings registering with said grooves and means on said guide for holding the same on Said rack.

In testimony whereof, I the said FRANK M. ALEXANDER have hereunto set my hand.

FRANK M. ALEXANDER.

W itnesses T. B. HUMPHRIEs, J. N. CooKn.

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

Washington, D. 0.

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