US2101969A - Silicate insulating material - Google Patents

Description

Examiner 106. COMPOSITIONS, l

COATING 0R PLASTIC.

Dec. 14, 1937. H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March 30, 1929 3 Sheets-Sheet 1 106. COMPOSITIONS,

COATING 0R PLASTIC.

Dec. 14, 1937.

H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March .'50, 1929 LXElmm@ 3 Sheets-Sheet 2 j ucnfot Examine COM POSITIONS COATING 0R PLASTIC.

Dec. 14, 1937.

H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March 30, 1929 3 Sheets-Sheet 3 mmm grs/vanto@ 07%, f/I/m au, fg/LMM Mu YM mi MH 106. COMPOSITIUNS,

pime on PLASTIC.

Patented Dec. 14, 1937 UNITED STATES PATENT OFFICE Application nach so, 1929, serial No. 351,364

IClaim.

This invention relates to refrigerating apparatus and more particularly to a cabinet for use with mechanical refrigerating systems.

An object of this invention is to provide a gapiget with a new tyge of insulation.

Further objects a van ages of the present invention will be apparent from the following description, reference being had to the accompanying drawings. wherein a preferred form of the 1 present invention is clearly shown.

In the drawings:

Fig. l is a vertical transverse cross-sectional view of a cabinet embodying features of this invention;

Fig. 2 is a vertical cross-sectional view of the cabinet taken at right angles to Fig. 1;

Fig. 3 is a horizontal cross-sectional view of the cabinet taken along the line 3-3 of Fig. l;

Fig. 4 is a view in perspective, with parts broken away, of the insulation which may be used in the cabinet; and

Fig. 5 is an enlarged cross-section of the insulation.

A cabinet embodying features of this invention may comprise in general a framework generally designated as 2U, a food compartment generally designated as 2l, insulation, generally designated as 22, and an outer casing generally designated as 23.

a0 The framework may be of any suitable construction. In one embodiment the framework may include vertical rear corner angle irons and vertical front corner angle irons 26. It also may include upper horizontal side angle irons 2l,

$6 upper corner front angle irons 28, upper rear corner angle irons 29. The framework may also include lower horizontal angle irons designated as 21a, 28a, and 29a which correspond respectively to the upper corner angle irons 21 to 29 inclusive.

40 Also, if desired, the framework may include intermediate side angle irons 2lb, intermediate front angle irons 28h, and rear intermediate angle irons 29h corresponding to similarly numbered upper horizontal angle irons, angle iron 2lb having its angle upwardly turned to receive the door jamb. All of these angle irons may be suitably joined at their intersections, for instance by spotwelding, and, if necessary, gussets 30 may be provided-at some or all of the corners in order to 50 reenforce the structure. I'he framework may also include a relatively non-conducting door jamb 3| which, if desired, may include upper and lower horizontal members 32, vertical side members 3,3 and, if necessary, a center mullion 3l.

55 These members may be made of wood, or other (Cl. 10G-19) non-conducting substance, and may have their intersections morticed in any suitable manner. 'I'he door jamb may be secured to the framework, for instance, by inserting it within the angles of some of the angle irons and by securing it in place by means of screws or the like.

The food compartment 2| may be of any suitable character. For instance it may be a boxlike sheet metal structure having an offset 36 along the edge of the opening. The edge 31 may be secured to the door jamb 32 by any suitable means such as by nails or the like, not shown. Finishing strips 38 may be placed over the edge 31 as well as over the edge of some of the outer panels hereinafter to be more fully described. u The compartment 2| may be porcelain enamel nish if desired.

The insulation 22 may be of any suitable construction preferably comprising a layer Ill of a porous baked material hereinafter to be more 20 fully described. This baked material may be attached to the food compartment with lining, if so desired, and an embodiment for doing this is by placing bituminous cement Il on the food compartment 2| or on the porous baked material, 25 or on both. While the bituminous cement is still in the molten condition, the porous baked material is applied to the lining, which is thus secured to the lining when the cement cools and hardens.

If desired, an outer layer of bituminous cement 30 42 may also be applied to the porous baked material. 'I'hus the porous baked material is conistance the panel structure may be substantially 40 as disclosed in the copending application of Henry P. Braeutigam and William C. Holbrook, Serial No. 257,989, tiled February 28, 1928, to which reference is made, if necessary, for a further disclosure. If desired, cushioning pads 43 45 of cardboard, wall-board or the like may be interposed between the framework and the outer panels. This is particularly desirable when the outer panels are porcelain enameled, to prevent breakage of the enamel.

Suitable doors 4I are hinged to the cabinet and, for instance, may be attached to the vertical corner angle irons 26 or to the door jamb member 33 by suitable hinges and screws. If a lower compartment 50 is provided for the reception of ma- 55 chinery or the like a door 5| may also be provided and may be hinged at 52. The machinery may rest on a metal panel 53 resting on the lower horizontal frame members.

I'he porous baked material 40 preferably contains silicate of sodium and some metal reenforcement. The reenforcement may be wire mh 60 preferably applied near both edges of the blocks 6I which are in a convenient shape for l application to the food compartment. The sol erably a hot dium silicate is preferably mixed with water,

preferably not over 50% of water, and is EaEed in suitable ovens at temperatures generally ranging between l000 and l100 F. The oven is prefear ottom urner of gas or oil suitable to maintain a temperature of 1000 F. to 1100 F. The mixture of silicate and water is placed in suitable pans and placed in the oven for the necessary length of time which causes the mixture to puiI and harden into a porous baked mass. It has been found that when sodium silicate has its ratio of SiO;` to NazO increased, the solubility of the baked product is decreased. Thus when the ratio of SiO: to NazO is 2 to l the resulting product is more soluble than the ratio is 3.25 to 1. Also the insolubility may be further increased by adding some substance,

preferably intermixed with the sodium silicate. A substance which has been found suitable is 'num sul hate. For instance, the addition 0% 72% of aluminum sulphate increases the insolubility somewhat. Also ammonium chloride (8%) further increases the so u lity.

ture of 5 pounds of sodium silicate 5% oz. of zinc oxide and 1200 cc. of wat-er Has are added, at least of all constituents other than water in the insulation is sodium silicate. Thus it has been found that blocks of the porous baked material when made as insoluble as possible, when reenforced by HARRYMWIILIAMS.

also given good resi-lits. Thus, when water-proong substances metal and when cov-

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