US2469825A - Automatic print washer - Google Patents

Description

May 10, 1949. s. HORNSTEIN AUTOMATIC PRINT WASHER Filed- Dec. 26, 1945 w w f n er, rd j e .A M I J Patented May 10, 1949 "UNITED STATES PATENT GFFICE AUTOMATIC PRINT WASHER Samuel Hornstein, Chicago, Ill. Application December 26, 1945, Serial N0.-637,214

3 Claims.

The present invention relates to the photographic art and has particular reference to appara-tus for Washing photographic prints to thoroughly remove therefrom the fixing solution; and it has for its object to provide washing apparatus embodying simplified features of construction and which apparatus operates automatically, efliciently and economically; the prints being continuously washed in a whirling body of water in a single compartment of a cylindrical tank in which the lowerstratum of the polluted portion ofthe body of water containing the fixing solution is periodically automatically syphoned away while pure water is being admitted to maintain the whirling action of the water without interrupting the continuity of the washing.

An object of my invention is to provide an automaticphotographic print washer which consists of a circular tank and in which the arrangement of the water inlets is such that the body of water is caused to rotate with a continuous whirling motion so as to create an active vortex in the central portion of the rotating body of water; the inlets being arranged in circumferentially spaced and preferably ci-rcumferentially and vertically spaced planes and the water supply conduits for such tank inlets being positioned to so direct the water along the inner face of the circular wall of the tank and, to facilitate the whirling motion of the body of water, spaceddefiected streams of water are introduced at circumferentially spaced points at relatively different elevations.

Another feature of my invention is found in the provision of improved means for preventing the-passage of the prints into the drain for the polluted water.

The various features of novelty whereby the present invention is characterized will hereinafter be pointed out with particularity in the appended claims; but, for a full understanding of the invention and of its objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

Fig. 1 is a top plan view of an apparatus embodying the present invention in a preferred form;

Fig, 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section, .on a larger scale, on line 3-3 of Fig. 2;

Fig.4 is a top plan view of a slightly modified form of apparatus, only a small fragment being shown; and

'Fig. 5 is a-section ReferringitoFigs.

on line 5-*5 ofFig. ,4.

1+3 ofthe drawing, l0 represents a cylindrical tank-that is low compared to its diameter, theratio in the tank illustrated being about one to three. On the periphery of=the tank are a plurality of hollow lugs spaced apart circumferentially of the tank; two suchlugs, H and I2, being used inithe particular construction illustrated. The two lugsillustrated are disposed diametrically opposite each other and each is wedge shaped in horizontal section. The lugs are so disposed that one side of each coincides with'the periphery of the tank and there meets the opposite side in what is the sharp edge ,ofa wedge orthe. apex of a triangular chamber within the lug. The lugs may conveniently bewed-geshaped cups that are welded or solderedin place with their open sides facing and closed by the tank wall. The chamber in each lug communicates with theinterior of the tank through a port M in the tank wall near the apex of the wedge. On the inner side of the tankwall, at each .of these ports I4, is a deflector :l5 extending from one side of and across theport Hi from top to bottomthereof; each deflector [5 starting atthe tank wall on the side of the port farthest from the apex of the wedge and slanting awayirom the port M in roughly parallel relation to the outer angular wall ill of the adiacentlug. The deflectors is are preferably the pieces. of the tank wall that are partially severed to produce the ports l4 and are bent at their juncture withsuch wall, preferably at an acuteangle, so that they project at the desired an le.

A water supplyconduit or hose l6 opens into the chamber in lug ll through the wall forming the base of the wedge. A connection hose ,or conduit l1 communicates with the chamber in lug ll through the wall thereof that forms the long outer side 13 of the wedge-shaped chamber in lug ll. Members 16 and I! are preferably substantially coaxial in the vicinity of the lug H with which theyboth communicate. Conduit [1 extends half way around the tank and opens into the chamber in lug l2 through the wall constituting the base of the wedge-shaped chamberin lug l2. Consequently, when the conduit or hose i6 is connected to a supply of water underpressure, a stream of water enters the chamberin lug I l, a portion of the supply of water going straight ahead and into conduit or hose I1, and a portion entering the tank through the port 14 connecting that chamber of lug H with the interior of the tank. That portion of the water that enters hose I1 is carried thereby into the chamber in lug l2 and from there passes into the tank. through thelocal port 14.

The function of the deflectors I5 is to cause the water to be delivered into the tank tangentially, that is, in a manner to flow circumferentially of the tank close to inner face of the tank side wall, whereby water in the tank is given a whirling motion, as indicated by the arrows in Fig. 1. With the lugs ii and if: placed in relatively different planes, as shown, effective rotation of the entire body of water in the tank to provide adequate agitation of prints in the water is assured.

In the bottom wall of the tank is a large central outlet 18. An outlet conduit l9, connected at one end to said tank outlet, extends radially of the tank, underneath the same, and to one side thereof where it meets a stand pipe 28. This stand pipe 25! is open at the top, provides a chamber therein which is of cross-sectional area longer than the conduit l9 and preferably terminates a little below the level of the top of the tank. A waste pipe 25, of substantially smaller crosssectional area than conduit l9 and open at the upper end, extends up from below into the stand pipe 29 and terminates at a substantial distance below the top of the tank; rising to only about two thirds of the height of the tank in the arrangement shown. The lower end of the waste pipe 2! extends through the bottom of the stand pipe and is joined to a horizontal waste discharge pipe 22 of the same diameter as the waste pipe El and forms therewith a sharp rightangular turn in the form of a sharp L. Telescoped over the top of the waste pipe 2| is a cylindrical bell or invertedcup valve 23 closed at its top by an end wall which rests on the crossed blade-like supports 25 disposed on edge on top of the waste pipe :22; the bell being larger in diameter than the waste pipe 21 to provide an annular space within the same around the Waste pipe 21.

The spider consisting of the thin blades 25 arranged in cross form which rests on top of the waste pipe 2! may be secured in any suitable manner, as by soldering or welding to the inner face of the bell cover 24 or preferably to the top of the waste pipe 2!; sufficient clearance for passage of water being provided between the inner face of the bell and the depending portions 25 of the blades 25 and between the latter and the exterior of the waste pipe 2i.

Within the tank I5 is a false bottom supported a short distance above the main bottom wall of the tank on short spaced supports 31; the false bottom 25 being a disc that peferably is very slightly smaller in diameter than the interior of the tank. The false bottom is thickly perforated except in a central area of considerable size; the perforations being preferably numerous small holes 21 arranged in concentric circles.

In using the apparatus, the water is turned on and prints to be washed are placed in the tank. The water enters tank in directions tan entially to the vertical tank well, being guided by the deflectors l5, causing the entire body of Water to whirl or revolve in the No water escapes into the waste pipe 2i until the level in the stand pipe 26 rises slightly above the top of the waste pipe 2!, whereupon some water starts to slightly overflow into the latter, however, the water level in the tank and in the stand pipe 23 continues to rise to about or near the top of the bell 23, the air within the upper part of the latter being carried along with the water, whereupon suddenly a solid column of water, extending from the horizontal extension 22 at the lower end of the waste pipe 2| up to the top of the waste pipe 2!, is created, as at this stage the water quite rapidly flows into the waste pipe 2| in sufficient volume to quickly fill the waste pipe 2! due to being retarded by the sharp turn at the bottom of the waste pipe 2! where it connects with the horizontal discharge pipe 22, consequently, a syphon is formed and water is quickly syphoned out of the tank until its level drops low enough to uncover the lower end of the bell 23, thereby allowing air again to enter the bell and breaking the syphon. The tank then fills to the hi h level, to be again partially drained; the cycle being automatically repeated as long as clean water is being delivered into the tank.

It may be noted that the polluted water from the lower portion of the tank is removed during the syphoning and that during such syphoning pure water is continuously being admitted into the tank so that the whirling washing of the prints is not interrupted during such intermittent automatic syphoning operations whereby the water is kept clean for continuous thorough washing of the prints.

The false floor prevents the prints from being dra n into the outlet it or from being subjected to the strong suction that exists directly above such outlet. The water that contains fixing solution grav ates to the bottom of the tank, so that only polluted water is withdrawn during a washing operation, fresh water constantly replacing the polluted water. In other Words, fresh, clean water is constantly being brought into contact with the prints from above while water that has become polluted is constantly moving down, away from the prints. The raised false bottom, the periodic dumping of the lower stratum of water in the tank and the whirling movement of the body of water in the tank, all contribute to the end that fresh water shall flow past the prints and, in doing so, shall pick up the fixing solution and then move on.

In the modification shown in Figs. 4 and 5 the syphoning means is placed Within the tank along one side of the vertical wall thereof. Instead of having a separate standpipe I make use of a porti o of the space within the tank; a vertical partition in the tank forming with the vertical side Wall of the tank a small compartment or chamber The waste pipe 2| and its bell or valve 23 are the same as in the other form, the waste pipe 2! coming up through the bottom of the tank into chamber 29. It will be seen that chamber 28 is preferably elongated circumferentially of the One reason for this is to provide room for a long row of holes 30 in the partition 28; these holes being placed close to the bottom of the Holes 30 take the place of both the main outlet 58 and the holes 2? in the other form; namely, preventing the prints from be -g drawn into chamber 29 and providing the A further reason for condesired drain outlet. structing the chamber 29 so that it is of elonsha e, as viewed from above, is to avoid in which the prints might be trapped and thus be preven ed from being thoroughly washed. C in indicates the direction in which the wate moves east wall 28. A print that is being carried along by the water moves along this wall just as fr ely as it does along an un obstructed section of the main cylindrical wall of the tank.

Washing is done in exactly the same way in this form of the invention as in the other, except that the polluted water may perhaps not recede as evenly as where there is a central outlet from the tank.

While I have shown the chamber 29 adapted to receive the polluted water through openings 30 in the partition wall 28, it is obvious that the perforations 30 could be eliminated and the polluted Water could readily be admitted into the chamber 29 through a conduit, similar to conduit 19, connected at one end with an opening in the tank bottom within the area of the chamber 29 and connected at its other end with a discharge opening in the center of the tank bottom similar to the opening 18.

While I have illustrated and described with particularity only a single preferred form of my invention, together with a single modification, I do not desire to be limited to the precise details thus illustrated and described: but intend to cover all forms and arrangements that come within the definitions of my invention constituting the appended claims.

I claim:

1. Washing apparatus comprising a cylindrical tank, a hollow lug enclosing a Wedge-shaped compartment on the periphery of the tank with its outer and inner sides meeting in an apex adjacent to the cylindrical wall of the tank, a water supply conduit opening into said chamber of the lug through the base of the wedge, a port leading from said chamber into the interior of the tank at the inner side of the wedge, and a deflector within the tank at said port disposed approximately parallel to said outer side of the lug.

2. Washing apparatus comprising a cylindrical tank, two hollow lugs on the periphery and spaced apart circumferentially of the tank each defining a chamber which is triangular in horizontal sec- 0 wherein tion, the inner side of the triangular chamber constituting the periphery of the tank and the outer side extending at an angle to said inner side, a port in the said inner side of each chamber, a deflector on the inside of the tank at each port, each deflector being approximately parallel to outer side of the corresponding chamber, a water supply conduit opening through the base of one of the lugs into one chamber, and a second conduit opening at one end into the outer side of the latter chamber and at its other end opening through the base of the other lug into the other chamber.

3. Washing apparatus as set forth in claim 2 said other lug is located at an elevation which is higher than the elevation of said one of the lugs.

SAMUEL HORNSTEIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 671,075 White Apr. 2, 1901 926,380 Amon June 29, 1909 932,265 Fritz Aug. 24, 1909 1,029,487 Burdick June 11, 1912 1,070,711 McGregor Aug. 19, 1913 1,802,192 Caps Apr. 21, 1931 2,143, i69 Banks Jan. 10, 1939 2,217,531 Werneth Oct. 8, 1940 2,332,624 Boeckeler Oct. 26, 1943 FOREIGN PATENTS Number Country Date 11,980 Germany (1880) Jan. 21, 1881

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