US2659582A - Foam forming device - Google Patents

Description

NOV. 17, I953 SANDQR 2,659,582

FOAM FORMING DEVICE Filed NOV. 10, 1950 6 PM JA m Patented Nov. 17, 1953 FORMING'DEVIGE NicholasSandondeceased;dateofSurbitom'Eng- '..land, :by -Florenee Margaret .Anne S'andor, i-iexecutrix, Surbiton, England Application November 10, I950,Seri'al No. 194,966

3 claims. 1

.I'hisiinvahtion r relates; to foam 5 formin ide- 'vicestvand has for anz-object; to '-.provide--a:.simple construction of foam forming device for :use: in the home, office or factory for producing a neutral foam =1eplacing. .ordinary soap, vfor vwashing.t-the hair or the hands and face.

Foam forming devices have revious1y been provided using connected wood blocks or plates inserted in acontainer of water to which hasbeen addeda 'foam'for'm'in'g medium -such as saponin,

come swollen again by immersion in water for a sufficient length of time the air under pressure leaks around the junction of the blocks and does not pass through the pores therein and foam is not formed. It is an object of the present invention to overcome this defect.

In accordance with this invention I avoid the difiiculties due to shrinkage and expansion of the wood by disposing the wood block or plate between the halves of an enclosing casing to one half of which air under pressure is supplied for passage through the pores in the wood and on the other half of which are provided openings for ingress of liquid and discharge of foam and by disposing elastic sealing means between the wood block or plate and the casing which sealing means permit expansion and contraction of the wood block or plate without breaking of the seal and therefore without leakage of air. The sealing means may be disposed between the upper and lower sides of the wood block and the casing or may be located in a peripheral groove in the wood block or plate.

In order that the invention may be more clearly understood the same will now be described with reference to the accompanying drawings in which:

Fig. 1 shows one embodiment of the device in section.

Fig. 2 shows another embodiment illustrating a different method of securing the parts of the casing together.

Fig. 3 is an inverted plan view of the casing shown in Fig. 2.

Fig. 4 shows a plan view showing the top part of the casing.

Fig. 5 shows a further embodiment illustrating aniflFerent. method"or'sealingirthe*wooii block-epiplate.

to the upper and lower facesof' the plate. The

upper half ofithe "casing is provided with open- ;ings' M for ingress "of-"liquid and "discharganf foam. Recesses arejprovided imupper and-flower parts of .the casing .to receive "sealingtrings "4, 5

of rubber or like. material. Thetwo ha1ves--i$f-t' he casing overlap, an upwardly extending-Time" adj'acent theperiphery of the'lowenpartroftfthe casing fitting within the edge of the-upper part .of the casingas, shown. The edges ."OfifthGftWO parts ofthe leasing are permanently "cemented together under pressure.

An air inlet pipe 1 is embedded in the lower casing material or attachment to a tube receiving air from a rubber infiator (not shown). Air spaces 8, 9 are left between the plate 3 and the parts I, 2 of the casing. Any expansion or contraction of the wood block is taken up by the rubber rings.

In the embodiments of Figs. 2, 3, 4 the same reference characters refer to the same parts as shown in Fig. 1. In this embodiment however the parts of the casing are secured together by screws which extend through clear holes II in the lower part to screw-threaded recesses [2 in the upper part. Preferably when the parts are tightened up there will be a small clearance between the meeting edges and the rings 4. 5 will be compressed.

In order to reduce the weight of the casing recesses 13 may be provided in the lower part of the casing as shown in Fig. 3.

In the embodiment shown in Fig. 5 a single sealing ring l5 of circular section of rubber or the like is provided this ring being disposed in a peripheral groove in the plate 3 and wedged within the walls l6 of the upper part of the casing. The two parts of the casing are secured together by screws Illa as in the embodiment shown in Fig. 2. The embodiment of Fig. 5 makes a very compact unit.

It will be seen that in the various constructions when the device is immersed in the liquid'from which the foam is to be formed and air under pressure is supplied to the space beneath the plate 3 by means of the infiator (not shown) such air can only pass through the pores of the plate or block, other means of escape being prevented by the sealing means.

What is claimed is:

1. A foam-forming device comprising a rigid casing including an upper part and an imperforate lower part, said parts of the casing being secured together, a porous plate of material which shrinks on drying and expands when wet mounted in the casing, said porous plate being mounted in spaced relation to at least a portion of said lower imperforate part of the casing to provide an air space therebetween and being provided with an outwardly facing peripheral groove, an elastic sealing means mounted in said peripheral groove in the plate, said elastic sealing means projecting outwardly beyond the periphery of the porous plate and engaging the innerperipheral surface of one of said parts of the rigid casing with an air-tight seal when the porous plate is dry, said elastic sealing means being adapted to be compressed between the rigid casing and the porous plate when the porous plate is wet and expands, and means for supplying air under pressure to the space between the lower imperforate part of the casing and the porous plate, whereby air is forced through the pores of the porous plate.

2. A foam-forming device as claimed in claim 1, in which the upper part of said casing includes a portion overlying the porous plate forming a collecting chamber for the foam above the plate, said portion being perforate, said upper part of said casing having a peripheral inside surface opposite the periphery of the porousplate, said elastic sealing means mounted in the peripheral groove of the wood plate being wedged against said inside peripheral surface of the upper part of the casing.

3. A foam-forming device comprising a rigid casing including an upper perforate part and an imperforate lower part secured together, one of said parts having an imperforate inner peripheral surface, a porous wood block which contracts on drying and expands when wet mounted in the casing opposite to and in spaced relation to said inner peripheral surface, said porous block being provided with an outwardly facing peripheral groove, an elastic rubber sealing means mounted in said peripheral groove in the block, said elastic sealing means projecting outwardly beyond the porous block in air-tight contact with said inner peripheral surface, an air space in the casing below and above the block, and means for supplying air under pressure to the air space below the porous block whereby air is forced through the pores of the porous plate, said elastic rubber sealing means permitting the expansion and contraction of the wood block without permitting the leakage of air around the block from the air space therebelow.

FLORENCE MARGARET ANNE SANDOR, Emecutrix of the last will and testament of Nicholas Sandor, deceased.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,208,821 Nordell Dec. 19, 1916 1,281,816 Nordell Oct. 15, 1918 1,677,502 Sweetland July 17, 1928 1,834,646 Sandor Dec. 1, 1931 1,964,345 Feller June 26, 1934 2,008,363 Maris July 16, 1935 2,216,791 Simjian Oct. 8, 1940 2,354,609 Phipps July 25, 1944

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