US1970120A - Heat insulated receptacle - Google Patents

Description

Aug. 1 1-, 15934. H M BADGER 1,97@,12@

HEAT INSULATED RECEPTACLE Filed July 18, 1931 3mm A; HARRY M G51? [5 ?atentecl Amigo it, 1934 Harry M. Badger, (Great llliarrington,

signer to Stanley-insulating Mesa, as-

Comuany, Great fiarrington, Mass, a corporation 0]? Maine Application July 18, 1931, Serial No. 55ll,623

3 (Claims. (Cl. Wit-=14?) This invention relates to thermally insulated receptacles and has particular reference to containers or receptacles of t ner and an outer wall of he type having an inmetal with a vacuous a space therebetween containing a medium to reduce the conductivity for heat between the two walls, receptacles of this type being disclosed in the patents to Stanley No.

1,071,817 dated September 2nd, 1913 and Anthon No. 1,426,446 dated August 22nd, 1922, and which patents have been assigned to the Stanley Insulating Company, the

assignee of the present application. Receptacles this sort are commonly lrnown as vacuum bottles, that term being used n its broad sense to cover receptacles generally, includ ng cans, jars,

jugs, et cetera.

I-leretofore, it has been the practice to pack the space between the inner and outer shells wi h a very finely divided material which will absorb gases andthen substance or granular haust the space of gas and air. Vacuum bottles so made are good commercial structures, but they do not entirely meet the them. Due to the finely d is packed within the space these vacuum bottles are demands made upon ivided substance which between the two walls, relatively heavy. An-

other disadvantage incident to structures of this sort as heretofore made is the expense inmanulecture because of the dificulty and required time drawing the air and gases from the filled space between the walls.

The aim or" the present invention is to provide a vacuum bottle of this type which is more emcient in that it has greater heat resistivity resulting in a slower rate perature within the inner s of change in the temhell; which is of lighter weight, and which is less expensive to make.

' in accordance with the highly exhausted space between area of being preferably so ara plurality oil pockets, cav- By preference, this medium has,

amount of insulation relatively small facets or present invention, the the inner and cle contains a medium high reflecting formed or arranged to provide a mulsurfaces miscellaneously disposed so as to obtain an irregular or difiused reflection of the heat rays or beams which tend to pass space. Also, by preference,

the outer shell or jacket through the vacuous the inner surface of and the outer surface or the inner shell are polished or otherwise given a or lustrous w so that these surfaces it being understood inner and outer will have a high degree of reflectivity. Any suit able medium having the capability oi reflecting the heat waves or rays in a high ratio to the in. cident rays may be employed, but, by way oi example, a metal-foil is herein specifically referred to. The metal-foil, preferably oi alumi num or tin, may be loosely wrapped or placed in the vacuous chamber. Obviously, however, the present disclosure is by way of illustration only, and the same or similar results may be obtained by using other materials than those herein specifically mentioned but having certain oi the characteristics herein referred to.

Other objects will be in part obvio and in part pointed out more in detail hereinafter.

The invention accordingly consists in the tea tures of construction, combination of elements and arrangement of parts which will be ex= emplified in the construction hereinafter set forth and the scope of the application of which will be indicated in the appended claims.

In the accompanying drawing, wherein is closed, for illustrative purposes, two embodiments which the present invention may talre:

Fig. l is a vertical section of a vacuum bottle embodying my improvements in one form; and

Fig. 2 is a partial sectional view oi a vacuum bottle showing another embodiment oi in= vention.

Referring particularly to 1, l0 designates the outer shell, and 11, the inner shell, the same being connected at the mouth of the vessel in the usual manner but otherwise being spaced apart. These shells, by preference, are of sheet meal. The outer shell may have the usual bottom 12, false bottom 13, and a battle plate 14. These members may be similar in construction to the corresponding members disclosed in my earlier Patent No. 1,691,912 dated November 29th, 1928,

byway of illustration only as the particular ar rangement and construction of the inner and outer shells and the bottom oi the container form no part or the present invention. Obviously, the receptacle may be of any suitable shape and be provided with any desired arrangement for facilitating evacuation of the space between the walls. The false bottom may have a threaded nipple 15 adapted to be coupled with a suitable exhausting apparatus, and the opening though this nipple may be closed by a plug 16 secured in place by solder it, all as disclosed in my aforesaid patent.

In accordance with the disclosure oil Fig. i, is intemesocl within the vacuous space be that this structure is shown ico tween the inner and outer. shells, a plurality of layers 20 of a sheet material, the surfaces of which have a high degree of reflectivity. This sheet material may be composed of a metal-foil, such as a tin-foil or aluminum-foil, which. has lustrous or shiny surfaces. In the present instance, three layers or plies are shown, but, ohviously, the number of plies may be varied depending upon conditions and requirements. The sheet material may be wound or Wrapped about the inner shell and may be folded about the bottom end of that shell. By preference, this sheet material or medium is not smooth but, on the other hand, is more or less rumpled so as to present a multiplicity of faces or facets angularly disposed relative to one another. In other words, the surfaces of the medium are more or less rough (although shiny) so as ,to irregularly reflect or diffuse the heat waves or rays which fall thereon. Also, by rumpling the foil, 2. multiplicity of pockets is provided, and the several layers are spaced apart, thus providing voids or cavi-' ties between the layers. The inner surface of the outer shell and the outer surface of the inner shell are provided with good reflecting surfaces and, to such end, such surfaces may be polished or silvered. After the parts are assembled, the air and gases are exhausted from the chamber between the two shells so as to obtain a high degree of vacuum.

In the embodiment shown in Fig. 2, the medium between the inner and outer shellsfor preventing radiation and convection of heat through the vacuous space is in the form of small particles or pieces 20' each of which has surfaces of high reflectivity. For example, this medium may consist of confetti composed of metal-foil more or lessloosely placed within the vacuous space. As in the preceding embodiment, this confetti provides a multiplicity of reflecting faces promiscuously disposed, there being voids or cavities between the pieces of foil. In this embodiment, the metal walls of the chamber are polished, and this chamber is exhausted, preferably to a high degree of vacuum.

While I have specifically mentioned metal foil as the medium between the inner and outer shells, the invention is not limited to that specific material, as other materials having surfaces of high heat reflectivity may be employed, and among these may be mentioned. paper provided with metallic reflecting surfaces. By preference, the selected medium is of such shape or form as to provide reflecting surfaces of relatively large area as compared to the mass of the medium. Also, the medium is preferably such as to permit it to be readily positioned within the chamber between the metal shells. If found necessary, a material may be placed within the vacuous space for absorbing occluded gases which may be given off to that space by the metallic walls or the metal Lemme foil, and thus aid in keeping the space up to a high degree of vacuum. The medium having the high reflecting surfaces may of itself be such as i to absorb occluded gases.

Vacuum bottles constructed in accordance with the present invention have a very high efiiciency because the rate of heat exchange through the space or chamber between the shells is very small due to the high degree of vacuum and owing to the medium therein which has high heat reflectivity. By polishing the walls of the vacuous chamber, the efficiency of the device is further increased. At the same time, excessive metal, which tends to act as a conductor of heat, is avoided, and the weight and mass of the finely divided material heretofore employed is largely eliminated. 7 Actual comparative tests have shown that a vacuum bottle constructed in accordance with the teachings of this invention is very much superior in efiiciency to vacuum bottles of this type as heretofore made. The process of manufacturing the bottle is greatly simplified because the space between the inner and outer shells may be more quickly and'easily exhausted of air and gases.

'As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and speciflc features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

I claim as my invention:

1. A vacuum receptacle having a pair of spaced metal walls, the chamber between said walls being exhausted to a high degree of vacuum, and a sheet material within said space and loosely wrapped about the irmer wall, said sheet material having surfaces adapted to reflect heat.

2. A vacuum receptacle having an inner metal shell and an outer metal shell, said shells being spaced apart, the space therebetween being exhausted to a high degree of vacuum, and rumpled sheet metal-foil within the vacuous space and wrapped about and enveloping the inner shell.

3. A vacuum receptacle having an inner metal shell and an outer metal shell, the chamber between said shells being. exhausted of air and gases, a rumpled sheet metal-foil within said chamber'and enveloping said inner shell, the

inner surface of the outer shell and the outer surface of the inner shell being polished.

' HARRY M. BADGER.

Images