US2493441A

US2493441A - Film tank agitator

Info

Publication number: US2493441A
Application number: US776921A
Authority: US
Inventors: Jr William H Carr
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-09-30
Filing date: 1947-09-30
Publication date: 1950-01-03
Anticipated expiration: 1967-01-03

Description

Jan. 3, 1950 w. H. CARR, JR

FILM TANK AGITATOR 2 Sheets-Sheet 1 Filed Sept. 30. 1947 I INVENTOR, williamli Carr J1:

- ATTORNEY Jan. 3, 1950 w. H. CARR, JR 2,493,441

FILM TANK AGITATOR Filed Sept. 30, 1947 2 Sheets-Sheet 2 INVENTOR,

llfilliamli Carr Jr.

ammy Patented Jan. 3, 1950 UNITED STATES PATENT OFFICE 2,493,441 FILM TANK "A I AIT R William H. Carr, Jr., Washington, D. 0. Application September 30; 194'7, Serial No. 776,921

This invention relates to agitators for film tanks.

An object of the invention is the provision of an agitator for film tanks in which the agitation may be timed as desired, the holder for the tanks being so constructed that it may be adjusted to support tanks of varying sizes.

Another object of the invention is the proretaining the holder in a predetermined position. Another object of the invention is the. provision of a mechanism for rocking tanks containing a solution for treating photographic. films or plates, the tanks being mounted in a pivoted and adjustable holder which is rocked periodi cally by an energized magnet acting on an armature attached to the holder, the timing of the rocking beingcontrolled by a thermostat including an adjustable member for varying the time at which a circuit to the magnet is closed.

The inventionconsists in the novel construction, arrangement and combinations of parts hereinafter more particularly described and claimed.

In the drawings, Figure l is a view in perspective of a m e chanism for agitating tanks for films,

Figure 2 isa vertical longitudinal section of the mechanism 'and'illustratin'g the manner of mounting a film' tank, Figure 3- is'a"fragmentary plan viewot the holder for a'tankyand Figure 4"showsmore or less diagrammatically,

a wiring diagram for agitating the device.

Referring more particularly to the drawings i designates a base member formed of metal. Three tongues are stamped from the metal base being bent upwardly to form a pair of parallel standards H and i2 and a standard |3 adjacent one end of the base.

A holder It: for a tank I6 (see Figure 2) which is adapted to contain a solution for treating photographic films or plates is pivotally mounted for rocking movement on the upper ends of the standards H and i2, as will be described. The holder includes a flat elongated steel plate I! which has upturned side flanges l8 and I9. Tongues iii are struck from each flange l8 and i9 and are bent downwardly below the plate IT. A pivot pin I connects each tongue with the 2 adjacently disposed upper ends of one offthe standards H and I2 for'pivotally mountingthe holder intermediate the ends of the plate I1." The "flanges terminate at an inner tapered por tion 20 oftl'ie plate. Each flange is provided with a pair of horizontally aligned slots 24 and 25. A movable slide 26 formed of wood or other suitable material has projections 21 at its opposite ends received by the slots 24 of the flanges I8 and 101] A similar slide 3i] has projections 3| received Lby'the slots 25 of the flanges. All of the projec- "t'io'nsarerectangular in cross section to prevent w turning in the slots. The inner wall of eachslide "isjfaced with a rubber mat 32 which may be in f'the form of sponge rubber, the latter engaging Lth'e side walls of the film tank 16 as shown in jliigure 2.

A bolt, 35 is secured to each flange l8 and I9 and projects laterally therefrom. Each bolt is proxvided with an eye 36 at the free end thereof to receive the inner ends of springs 31 and 38. The "outer ends of the springs 31 are attached to fan eye bolt 39 mounted in each of theprojections 21 on the slide 26, while aneye bolt 39 extend- "ing from each of the projections 3| of the slide "is connected'to the outer ends of the spring ,38. l3y this construction, the pairs of springs 31 and 38.tend at all times to pull the slides, 26 and 30 toward' each other for clamping the film tank 0. Hi-between the rubber mats 32.

., A coil spring 40 has one end secured at 4| to the outer, end of the plate 20 while'the other end ;,of the spring is connected to a lug 42 struck up irom the metal base ll].

A mechanism is provided for pulling downwardly upon the inner end of armature 20 periodically against the tension of the spring 4|] 'and such*rnec hanisin includes an 'electromagnet 45 mounted on the base It) and energized by an electrical current. Wires and 41 are connected with a coil 48 of the electromagnet (see Figure 4) A double pole double throw 110 volt A. C. commercial relay of the time delay type is represented by member 52. The relay includes an 45 armature 5| upon which

contacts

54 and 63 are mounted operable against fixed contacts 'II and 64 respectively by a spring 53. When the relay coil 50 is energized the relay armature 5| is attracted and the

movable contacts

54 and 63 are 50 pulled against fixed contacts and I2 respectively. This action energizes the electromagnet 45 which in turn attracts the armature 20. The circuit energizing the electromagnet 45 comprises the following members: wires 51 and 56, contacts 55 54 and 55, wire 41, electromagnet Winding 48 and winding 48 and wires 46'and 58.

wires 46 and 58. An attachment plug 59 (Figure 1) forms the connection with the source of current. Fixed contacts II and 12 on the relay are not used electrically but are used as mechanical stops.

The time delay feature of the relay is provided by a heating coil 68 encircling a thermostatic strip 6| having a contact 19 mounted on the free end thereof. When the heating coil 68 has raised the temperature of the thermostatic strip 6|, this member bends downwardly bringing the contact 18 against adjustable contact 68. This action energizes relay coil 50 causing the armature 5| to be attracted and pulling

movable contacts

54 and 63 against

fixed contacts

55 and 12 respectively. This action also separates movable contact 63 from fixed. contact 64 which breaks the circuit energizingthe heating coil.

The operation of my device is as follows: The film tank I6 is supplied with the proper solution and the films to be treated are disposed therein. At this time, the mechanism will be in the position shown in Figure 2. The member 59. is then plugged into a socket connected with a source of electrical current so that the current will pass through wires 51 and 13 through the heating coil 68, through wire 62, contacts 83 and 64 and

wires

65 and 58. Since the spring 53 draws the armature 5| away from the relay coil 58 when no current is passing through said coil, the

contacts

63 and 64 are in engagement and in position to maintain a closed circuit to the heating coil.

The, thermostatic strip 6| with the contact 70 is bent downwardly when sufiiciently heated by the heating coil to so. as to cause the engagement of contact 10 with the adjustable contact 68. When this occurs the relay coil is energized and attracts the armature 5|. The preceding circuit makes use of the following members in proper sequence: wires 51 and 13, thermostatic strip 6|,

contacts

10 and 68 ,'relay coil winding 69 and wires 6'! and 58. When the armature 5| is drawn against the

contacts

12 and 55 two actions take place. p by, means of the following members: wire 51 and 56,

contacts

54 and 55, wire 41, electromagnet Second, the circuit through the heating coil 60 is broken since this circuit depends on contacts 63 and 6 4 being in engagement. When the electromagnet 45 is energized it draws the armature 2.8 downwardly against the tension of the spring 40 thus rocking the holder I5 in a direction which is opposed to the action of the spring. As the, thermostatic strip 6| is no longer heated it cools and moves upwards causing contact 10 to become disengaged from contact 68. This action breaks the First, the electromagnet is energized circuit through the relay coil winding 69 which de-energizes the relay coil and allows the spring 53 to return the armature 5| to its original position. When the armature 5| returns to its original position contact 54 is separated from contact 55 thus breaking the circuit through the electromagnet winding 48 and allowing the spring 49 to return the armature 20 to its original position. When the armature 5| is in its original position contact 63 isin engagement with contact 54 thus energizing the heating coil 68 and causing the entire operation to take place again. The number of operations per minute is dependent on the setting of the adjustable screw 68.

I claim:

1. In a mechanism for rocking a film tank containing a solution for treating photographic films, a holder for the film tank comprising an elongated metal bottom plate having upstanding parallel side flanges extending for a portion of the length of the plate, said flanges having spaced and horizontally aligned elongated slots, a pair of spaced slides between the flanges, a projection on the end of each slide received by an adjace'ntly. disposed slot for guiding the slides towards or away from each other and springs connected between the projections tending to draw the slides toward each other, a resilient pad on the inner face of each slide adapted to engage a wall of the film tank, and means pivotally mounting the plate intermediate the ends thereof.

2. In a mechanism for rocking a film tank containing a solution for treating photographic films, a holder for, the film tank comprising an elongated metal plate having upturned side flanges extending approximately from one end thereof and terminating inwardly of the opposite end of the plate, parallel slides between the flanges,

means urging the slides toward each other for clamping a film tank therebetween, a base mem ber below the plate, standards rising from the base member and means pivotally connecting an intermediate portion of the plate with the upper ends of the standards.

WILLIAM H. CARR, JR.

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

UNITED STATES PATENTS Number Name Date 715,301 Schodron Dec. 9, 1902 1,421,016 Leipold June 27, 1922 1,739,349 Blain Dec. 10, 1929 2,034,902 Heinze Mar. 24, 1936 2,048,756 Schultz July 28, 1936 2,104,283 Webster Jan. 4, 1938