US2067581A

US2067581A - Cushion flask base

Info

Publication number: US2067581A
Application number: US15969A
Authority: US
Inventors: Cecil H Smith
Original assignee: AMERICAN LA FRANCE FOAMITE
Current assignee: AMERICAN LA FRANCE FOAMITE; AMERICAN-LA FRANCE FOAMITE Corp
Priority date: 1935-04-12
Filing date: 1935-04-12
Publication date: 1937-01-12
Anticipated expiration: 1954-01-12

Description

Jan. 12, 1937.1 c. H. SMITH 2,067,581

I CUSHION FLAsK BASE Filed April 12, 1935 Q Q o INVENTOR.

l aienterj Jan. 12, I937 "Terrier CUSHION 'FLASK BASE Cecil Smith, Elmira, N. Y., assignor, by mesne of New York assignments, to American-La France-Foamite Corporation, New York, N. 31., a corpo'raticn Application April 12, 1935, Serial Nc. laced 3 Claims.

This invention is a cushion flask base incorporated with a self-supporting flask or container for liquefied gas, as CO2, having advantages hereinafter pointed out and structural features described herein and set forth in the claims which define the scope of the invention.

Referring to the drawing, Fig. 1 is a side elevation of the flask with associated fire extinguisher equipment;

Fig. 2 is a central vertical section of the flask showing its bottom and base, other parts being broken away;

Fig. 3 is a section of flask and cup before assembly, and

Fig. 4 is a bottom plan corresponding to Fig. 2.

Flasks or containers for liquefied gas, as CO2, which must sustain a very high pressure, have to that end been made heavy, and the problem thus arises of providing lighter flasks without sacrifice of strength. Reduction in weight with marked increase in strength is effected by making the flask spherical, i. e. shaped like a complete or partial sphere. In the illustrative structure in the drawing, the flask I is a cylinder having a rounded or spherical bottom 2. This shape, with the inner walls of the requisite uniformity in thickness, cannot be attained by forging, but is readily produced by externally and internally machining the roughly forged flask which for that purpose is provided with a radial lathe center spud 3 forged integral with the flask, as indicated in Fig. 2 where it is coaxial with the cylinder, or welded to the flask bottom prior to heat treating of the flask, and in either case subsequently annealed and machined down to screw-threading diameter and threaded, as indicated at 4. The flask is provided with a supporting base member firmly secured to and incorporated with it to produce a cushion flask base and formed as an inverted sheet metal cup 5 having a free rim-for contact with the floor or etc. and an upwardly facing concavity 8, formed in the ordinary process of stamping and a central hole in which the spud projects, the parts being drawn together and fastened by the nut l on the spud with an intermediate lock washer 8 if desired. The external radius of the spherical bottom of the flask is made a little greater than that of the concavity 6, and the curvature of greater radius is drawn into the curvature of lesser radius, a heavy set being in this way put on the cup or base, normally pressing the unfinished edge of its concavity 5 tightly against the spherical bottom of the flask and holding the parts in contact over a wide area as indicated by Fig. 3. This mode of attachment has the advantage first, that it tends to lock the base from turning on the flask so as to unscrew or loosen the nut and second, that it forms a water-tight joint with the flask, which joint is not likely to be opened up by the effect of blows from external objects in the course of hard usage and which is further protected by being located well in from the maximum outside circumference of the flask. These flasks are fairly heavy and subject to injury and possible fracture when dropped or roughly handled. The elastic nature of the cup, with its rim free, and its side wall constituted of the elastic sheet metal skirt extending downward and outward from the circular edge of the extended area of firm anchorage to the flask bottom, insures a protective cushion effect which markedly reduces the risk of such injury. The exclusion of water from the space between the flask and cup is moreover, of primary importance, since, by rusting, the flask wall may in time become weakened and its margin of safety against bursting destroyed. The downturned flange or skirt part 9 of the cup is of no more than sufficient depth to prevent contact of the nut: I with the floor, which leaves the nut accessible for removal if it should be necessary to substitute a new base for one which had become deformed in the performance of its flask-protecting function above referred to.

Where the flask body is cylindrical, both ends may be made substantially spherical. Fig. 1' shows the usual design provided with a valve head Hi, and operating lever H with the hose and discharge horn, the latter being held in clips l2 and 13. The lower clip I3 is welded to the elastic base.

I claim:

1. A cushion flask base having in combination an externally machined flask or container for liquefied gas, as CO2, having a spherical bottom provided with a radial lathe centre spud, a sheet metal base member having a down-turned outwardly extending elastic skirt constituting an inverted cup having its rim free for contact with the flask supporting surface and providing a cushion support for flask protection and having also an upwardly facing concavity surrounding a central hole receiving the spud of the flask, and means cooperating with the spud for securing the base member and the flask together with the spherical bottom seated in and in extended contact with the concavity.

2. A cushion flask base having in combination an externally machined flask or container for liquefied gas, as CO2, having a spherical bottom provided with a radial lathe center spud, a resilient sheet metal inverted cup providing with the flask a cushion support therefor and having a spherical concavity of lesser internal radius than the external radius of the flask bottom and provided with a hole through which the spud passes, and means for giving a set to the base and securing the base and the flask together with the spherical bottom gripped in the concavity in close continuous surface contact therewith.

3. A cushion flask base having in combination a cylindrical externally machined flask or container for liquefied gas, as 002, having a spher ical bottom provided with a radial lathe center spud, co-axial with the flask, a resilient sheet the flask bottom and form a Water tight joint] and securing the base and the flask together with the spherical bottom seated in continuous contact with the concavity over an extended 10 area, the line of contact of the rim of said spherical concavity with the flask bottom being remote from the outside circumference of the flask bottom and the sheet metal flange extending freely downward and outward from said 15 line of contact.

CECIL H. SMITIL.