UNITED STATES PATENT OFFICE

DAVID FORBES KEITH, OF TORONTO, ONTARIO, CANADA

REFRIDGERATING DEVICE

Application filed June 27, 1927. Serial No 201,904,

My invention relates to refrigerating devices operating upon the absortion system, and more particularly to units which are separable from the freezer boxes or other coolers in which they are intended to be employed.
While my device is a departure in some of it principles of operation from standard absorption systems, in that there are no check valves employed by me, it operates through a similar cycle to all intermittent absorption systems, this is to say. I provide two receptacles, one a generator-absorber, which contains a suitable liquid, such as water and the other an evaporator-condenser, which contains a suitable refrigerant, such as ammonia, with suitable connecting paths between the two receptacles so that when the generator-absorber is heated , the gases will pass over into the evaporator-condenser receptical, by one path, and when the generator-absorber is permitted to become cool, it will reabsorb the gases, as they volatilize in the evaporator-condenser receptical, said gases pass back and are absorbed in the liquid in the generator-absorber, with the result of absorption of heat (production of cold), within and about the evaporator-condenser receptical.
As intimated above, one of my objects is to provide a refrigerating unit of light weight. Another object is to provide means in connection with a novel arrangment which guides the user in locating the unit during the generation period, the refrigerating period, and in draining back the water of condensation into the generator-absorber, for the retention of sufficient liquid to serve the function of a seal when the device is in operation. Other objects are to provide a system of absorption which operates efficiently without the use of mechanical valves, to provide a method of dehydrating and cooling the gas passing from the generator-absorber and it's surroundings. It is also my object to provide a simple and effective method of attaching metal fins to the generator shell.
A general object of my invention is to provide a structure which will be simple to make, and fool-proof in operation, and which can be readily moved about during the respective periods of generation and absorption, so that the generator-absorber can be placed over a flame, during generation, and the evaporator-condenser be placed into a water vessel during condensation and a suitable box, vessel or receptical during the evaporation and absorption, with the generator-absorber on the outside of the said box, in the last instance. In this connection it is my object to make the two main recepticales of spherical shape and light in weight and to connect them by means of tubular means which will serve as a support for the device when in use, and to which a handle for moving it about may be applied.
It is my object to provide for an automatic warning which will indicate by sound or change in color, when the operation of generation has been completed.
It is my object to provide in connection with the evaporator-condenser element for a simple mode of freezing desired materials in a "tray".
It is my object to provide in connection with my device for a simple means of assuring a proper cooling action in the evaporator-condenser element during condensation, preferably by means of a suitable circulation device in the nature of a dome which sets up cooling currects of water about the evaporator-condenser shell, and a circulation throughout the entire vessel.
The above and various other advantages I provide by that certain construction and arrangement of parts, of which a typical example will be hereinafter more specifically pointed out and described, and the novelty of which will be set forth in the appended claims.
In the drawings :-
Figure 1 is a central longitudinal section taken through the selected example to be described, showing my invention.
Figure 2 is a perspective thereof.
Figure 3 is a section on the line 3-3 of figure 2, showing only the generator-absorber shell.
Figure 4 is a detailed perspective of one of the cooling fins on the shell.