US1712978A - Process of making refrigerators - Google Patents

Description

Ma. y 14, 1929.

s. s. BRINKMAN 1,712,978

PROCESS OF MAKING REFRIGERATORS Original Filed Feb. 23, 1927 2 Sheets-Sheet l lid Patented May 14, 1929.

rais ns UNITED STATES OFFICE.

SEBASTIAN G. BRINKMAN, tlli' lifii'i:

th'iginal application filed February a,

July 26, 1527.

This invention relates to improvements in refrigerators, and more particularly to a double or spaced wall porcelain refrigerator, and is a division of my application lilo-d Feb. .23, 1927, and bearing Serial Number 170,368, which has become Patent 1,6673%.

An object of the invention is to provide a retrigerator formed of a plurality ot cw operating compartments, each compartment being built with spaced porcelain walls, be tween which is a vacuum, or if desired, dead air may be trapped therebetween.

A lurther object of the invention to pro vide suitable means and a novel process whereby the spaced walled. porcelain boxes or 1ompartmonts may be moldciv and baked.

A still tlin'ther object of the invention is to provide a process whereby the spaced walled porcelain compartments may be reintm'ced and further provided with means whereby the usual refrigerator lit-tings may be sup ported.

Other objects will appear as the description proceeds.

lln the accompanying drawings which torm a part oi my application,

Figure 1 is a perspective view of a refrigerator made in accordance with my invention; i Figure 2 is a sectional view taken on the line 22 oi Figure 3;

Figure 3 is a sectional view taken on the line 3--3 of Figure 2;

Figure at is a front elevation of the outer plaster mold;

Figure 5 is a vertical sectional view taken on a central line through Figure 6, and

Figure 6 is a sectional view taken on the line 66 of Figure 5.

Like characters of reference are used tl'lroughout the following specification and the accompanying drawings to designate corresponding parts. i

In brief, I provide a porcelain reiriger ator composed of one or more integrally formed spaced walled compartments, which are sealed or closed by means of doors termed in the same manner and from the same material.

The refrigerator compartments E are formed in the following manner A working table 1 is provided for supporting the mold. and has an opening 2 cut through it near its central. portion of a size corrcspomling to the largest outside diameter of the inner lilldiff J'EKSLEY,

182$, rte-rial Ito. 170,363. Divided and this application filed burial l r'i'o. $398,566.

mold. The core 3 is formed with. tour sides and a top, and is open at its bottom. The lower portion of the inner core 3 is outwardly flared as at 1-, to provide for the bevel usualliv found in the front of refrigcratm' compare ments, and cooperates with a correspondiugly beveled surface of a door, to form a tight joint. lit will be seen that a the core 3 is slidable within the opening 2, and is supported by the table in anysuitable manner. The top oi the core 3 is closed except for a central opening 5, the sides of which are beveled and cooperate with the beveled sides of a central supporting head 6, carried by the adjustable standard 7. It will be understood that all parts of the core 3 and head (3 are formed of: plaster.

A recessed base plate 8 of plaster is positioned about the core 3, and seats on the annular flange about the lower edge of said core. The plate 8 is supported on the table 1, and supports themold 9 in spaced relation to the core 3. The mold 9 comprises four interlocking walls of plaster and is provided with an interlocking removable top 10. When the base plate, core and mold arein PUL-ElldOil, the sereral joints between the same are sealed with clay to prevent leakage of the slip when poured in the mold. A filling tube or pipe 11 of brass extends into the space between the core and mold, while an overflow pipe 12 also extends through the upper portion of the mold 9 to let the air out of the mold and to give warning when the mold completely filled with the clay slip. A drain pipe 13 extends upward into the space between the core 3 and mold 9, and is used to drain oil the undesired port-ion o'l the clay slip, after the walls of the compare ment being molded have been formed to the desired thickness. This operation is usually calculated. by time, since the plaster between the core an d mold absorbs the moisture in the clag slip, and causes a wall to be built up against the sides thereot. Each compartment will be formed with at least one side wall or a single thickness, which will be arranged with a SLlYlOlll'Kllllg peripheral flange 65, so that when the compartments are in place, one above the other, or side by side, there will be a space provided therc-- between for trapped air.

Plugs 14lextend through the core 3, towards the inner wall of the mold 9, and provide passages 15 in the refrigerator com-- partments, for the passage of air through the same, or through adjacent compartments. The plugs 14: being made of plaster, will also cause the clay slip to form a wall about the same. Likewise the spaced walls of the compartments will be reinforced, by inserting plaster plugs 16 through the core 3, and permitting the clay slip to build up around the same. Plugs 17 will be inserted through the core 3 to form openings in the inner wall or surface of the compartments to receive supporting means for the trays '18. The compartments will be so formed that the passages'l'fi are in alinement with similarpassages in adjacent compartments, so the a circulation of air may be had between the several compartments of the refrigerator.

Assuming that the core and mold are in position, the method of making the compartments is.as follows: The space between the core-and mold is completely tilled with a clay slip,through a tunnel in the filling pipe, iuntilthe .slip starts :to run out'ot' the overflow pipe '12, at which time the-overflow pipe is .closed'by means of a suitable plug. The funnel will be kept full of the slip. The slip is permitted to set for approximately four hours, during which time, the moisture will be drawn out into the plaster walls of the core :and mold, and spacedwa'lls will be built :up from the slip. A drain plug in the drain pipe 13 is then removed andall of the slip remaining in liquid form will be .drained from the mold. At the same time an air line will .be connected to the :filling pipe and alow pressure of'air will be directed into the space hetweensthe walls :formed by .the slip. In this manner thenpper or outer wall formed by the slip will :be supported on an air cushion, and will be keptzfrom collapsing. In place of the .air cushion, it is found-that water or any suitable fluid can be substituted in lieu thereof. .After this operation, thecore is lowered through the central opening in the table, while .the supporting head is held in its raised :position to support the inner horizontal wall .formed by the slip. After a predetermined length of time theair may be turned off, or the water drained from'the space between the Walls, and the supporting head lowered through the opening in the table, and the mold taken apart. It will thus ibe seen that a spaced walled compartment having reinforced walls, will be formed. The refrigerator fittings may be applied in any suitable manner. The doors forzthe compartments will be formed in the same manner, but with difi'erent molds. .The

Y the cold compartment walls will be approximately one half inch in thickness, while the space thercbetwcen will also be approxiniaicly one half inch. The box or compartment will usually be tired in a kiln while in a biscuit state, after which a plurality ol glazing coats will be applied to the box. which will then be burned a second time in a gloss kiln, to form the completed article. However, one firing may be used instead of two lirings.

The space between the walls oi? the compartment may be tilled with dead air, or may be a vacuum, as desired.

It se eral compartments are to be used together to make a refrigerator, suiinblc bolts 19 may be employed to hold the said con'ipartments in place. The compartments may be supported directly on the lloor, or on a base 21.

From Figure 2 of the drawings, it will be apparent that the compartment on the upper right hand corner will be the icc compartment, and that the cold air will pass down through the passage into the lower 'ight hand compartment, and from there to the lower left hand compartment, and up into the upper left hand compartmciu, and finally back into the upper right hand compartment. Hence, a complete circulation of air in the several compartments will be had, thereby keeping the temperature in the several compartments at a fairly even degree. It will be apparent that no insulating material will be used as in the ordinary torm oi refrigerators, and the vacuum or dead air between the spaced walls will serve to retain within the compartments. Of course, the compartments could be used just as successfully as a medium for heating. as the double spaced wall construction rcndcrs the compartments thoroughly air tight and insulated.

Many minor changes in detail ol construction may be resorted to without de parture from the spirit oi the inventimi.

Having thus described my invcntion what I claim as new and desire to secure by Letters Patent of the United States is:

The process of forming an integral molded spaced double walled porcelain rcfrigerator unit, consistingot setting plasicr forms in spaced relation, pouring a clay slip therein, permitting the same to sci for a period of time, draining the (xi-mes slip, admitting low pressure of fluid between the walls formed of the slip, and mechanically supporting the inner top wall of the unit.

In testimony whereoi I aliix my signature SEBASTIAN o. BRIN-KMAN.

Ell)

Images