US1810857A - Cooled development apparatus - Google Patents

Description

June 16, 1931. w. G. THOMPSON ET AL 1,310,857

COOLED DEVELOPMENT APPARATUS Filed March 17, 1950 2 Sheets-Sheet l lllllllllll "ll Illll June 16, 1931. w. a. THOMPSO-N ET AL I 1,810,857

COOLED DEVELOPMENT APPARATUS Filed March 17, 1930 2 Sheets-Sheet 2 3nventor8 attorney Patented June 16, 1931 UNITED I STATES PATENT, OFFICE 'WIIJ'ORD G. THOMPSON AND JAMES E. JORDAN, OF EL PASO, TEXAS OQOLEI) DEVELOPMENT APPARATUS Application ill ed March 17, 1980. Serial No. 486,586.

The present invention relates. to improvements in cooled development apparatus and has for an object to provide an improved developing apparatus for photographic work 6 of various kinds in which the wash water and fixing solution are maintained at a substantially constant low temperature as is found desirable for mostsatisfactory development work.

Another object of the invention is to provide an improved developing apparatus which is especially applicable to the X-ray photographs taken by dentists, and which require an accurate and high development in .order to faithfully ortray the condition of the roots of the teet etc.

A further object of the invention is to provide an improved photographic develo ing apparatus which Wlll be of general app ication and consist of a compact device and organization of parts and of a simple and economical ,form, whereby a constant temperature may be maintained at all times at a minimum of expense.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like orv corresponding parts throughout the several views:

Figure 1 is a top plan view of an improved developing apparatus constructed according to the present invention with the top cover removed.

Figure 2 is a vertical section taken on line 11 open through the upper portion of the cabinet in any appropriate manner. Spaced inwardly from the side walls and bottom of I the tank 11 is a receptacle 12. Between the walls 11 and -12 is filled cork or other insula tion 13. s

The receptacle 12 is also open at its top and adapted to be covered by'theremovable lid 14. Such internal receptacle 12 is divided into a number of compartments, shown most clearly in Figure 1, in which 15 represents the wash water com artment, flanked on opposite sides by two fixing bath solution compartments 16 and 17, these vari- Gil ous compartments being separated from one another by the partition walls 18 and 19 which will extend substantially the full height of the receptacle. There is also a coo in chamber or compartment 20 extending 0 one end of the wash water compartment 15 and [separated therefrom by the transverse partition wall 21 which extends between the longitudinal partition walls 18 and 19.

In the compartment 20 are situated two coils 22 and 23, the coil 22 being for the purpose of cooling the wash water which is supplied to the compartment 15 by a pipe connection 24 extending from the lower endof the coil 22 and through the bottom wall of the internal receptacle 12. As shown more particularly'in igure 3, the washwater is received from the city service pipe or other source through a pipe connection 25 as controlled by a valve 26 situated in said pipe 25. The pipe 25 connects with the upper end of the coil 22.

Now withregard to the refrigerating coil 23, the same is connected in a compressor-expander circuit involving the compressor 27, driven by the electric motor or other source of power 28, a condenser 29,.and the expansion refrigeration coil. 23 above referred to. v

The compressor 27 connects with the upper portion of the coil by a pipe 30, while the lower side of the coil 23 is connected with the condenser 29 by a pipe 31 having therein an expansion valve or device 32.

There is a thermostat 33 or a thermostatically controlled switch for the motor 28 whereby a substantially constant temperature may be maintained in the cooling compartment 20, which compartment is preferably filled to a desired level with water or some other liquid which will act as a suitable transfer medium between the coils 22 and 23. In the use of the device, the thermostat 33, which has connection to the bath in the freezing tank 20, or one of the other tanks, will open and close the circuit to the motor 28 accordingly as the temperature rises and falls in the body of liquid maintained in compartment 20. A predetermined low temperature, say degrees F., is selected and the thermostat 33 is set for this temperature; whereby, on a rise in temperature above the selected temperature of 65 degrees F, the circuit will be closed through the motor 28, and the apparatus will thereby be put in operation. As soon as the temperature reaches that selected, the motor circuit will be interrupted, and the activity of the refrigerating apparatus suspended until such time as the temperature again rises beyond the selected degree.

Such automatic action will maintain the fluid in the refrigerating tank 20 at a constant low temperature. Cooling will thus be communicated to the in-coming water which is circulated through the coil 22 before being delivered to the wash water compartment 15. By radiation, the side tanks 16 and 17 for the fixing baths will be kept cool.

The li-ray-dental pictures, or other photographs, having been taken, the lid 14- is removed and the negatives immersed in the solution and wash water baths, after which they are removed and placed to dry.

The water in the wash water compartment may be maintained at a constant level by the use of an overflow pipe 34 which extends up within the compartment 15 and has its open upper end disposed in the upper portion of the compartment.

It will be noted that all of the compartments or tanks are exposed through the up per part of the cabinet and that the arrangement is such that all connections are made through the bottom of the cabinet and that the lower portion of the cabinet is utilized.

to contain the refrigerating unit.

It is obvlous that various changes and modifications may be made in the details of construction and design of the above specifically I described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

What is claimed is 1. In a developing apparatus, a, cabinet, a

. tank in the upper portion of the cabinet exposed through the upper portion of said cabinet, a receptacle within and spaced from the bottom and sides of the tank and having intersectin partitions dividing the interior space 0 the receptacle into a plurality of compartments all opening substantially through the upper part of the cabinet, a refrigerating coil in one of the compartments, 0. refrigerating unit contained in the lower portion of the cabinet and connected to said coil, a cooling coil in said compartment con necting with the source of wash water supply and with an adjacent compartment for wash

Images