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Publication numberUS2150287 A
Publication typeGrant
Publication dateMar 14, 1939
Filing dateDec 21, 1936
Priority dateMay 16, 1936
Publication numberUS 2150287 A, US 2150287A, US-A-2150287, US2150287 A, US2150287A
InventorsHenry R Minor
Original AssigneeInd Process Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sponge rubber body of different densities
US 2150287 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

March 14, 1939. I R. MINOR 2,



Patented Mar. 14, 1 939 UNlTED STATES PATENT OFFICE SPONGE RUBBER BODY OF DIFFEREN DENSITIES Henry R. Minor, Dayton, Ohio, assignor to IndustrialProcess Corporation, Dayton, Ohio, a corporation of New York Original application May 16, 1936, Serial No.

80,191. Divided and this application Decem- 'ber 21, 1936, Serial No. 116,959

1 Claim.

. It is a particular object of my invention to provide a sponge rubber seat cushion having areas of greater density where the greater Weight is applied and to combine with this arrangement a seat cushion having a proper configuration for the reception of the weight of the body and the form of the body.

It is a further object to provide a method of loading a mold for forming such a seat cushion of sponge rubber.

This application is a division of my application Serial No. 80,191, filed May 16, 1936.

Referring to the drawing:

Figure 1 is a top plan View of the cushion.

Figure 2 is a side elevation thereof.

) Figure 3 is a section on the line 33 of Figure 1 looking in the direction of the arrows.

Figure 4 is a top plan view of the moldpartially loaded.

Figure 5 is a section on the line 5-5 of Figure 4 looking in the direction of the arrows.

Referring to the drawing in detail, I represents a sponge rubber seat cushion, which may be either of a continuous body of sponge rubber of different densities and different areas, as at 2 and 3, or it may be formed of a seat portion 4 and vertical members 5 forming tubular areas 6 of difierent portions of the structure of greater density than others. The latter method is: the preferred method of manufacturing this cushion.

If desired, the surface of the cushion may be formed with depressions 1 and. the elevated areas 8 in order to provide a shaped surface for the reception of the body of the person sitting upon the cushion. Such depressed areas are ovoid in shape, as indicated in Figure 3.

In the manufacture of such a cushion, I prefer to use a sheet metal mold having side Walls, top and bottom of sheet metal designated 9 with a plurality of open-ended tubes 9 extending into the interior of the mold. The tops of these tubes are closed as at H with the exception of a few perforations 12.

These tubes are staggered with respect to one another and arranged in rows. Between the rows are inserted in a vertical position the rubber stock sheets l3 which are turned horizontally over the tops of the tubes as at M with their edges l5 overlapping the next adjacent portion M of the strip.

When it is desired to provide areasof greater density, either the stock sheets thus. inserted may be made of a material as hereinafter described of greater density or additional sheets l6 may be inserted of the same or greater density than the adjacent sheets of stock. These sheets I6 will be of lesser length and will be confined to the particular area which it is desired to make of denser material to form the areas 2.

When the stock is thus arranged, the mold is closed and placed in a vulcanizer for vulcanization and curing in accordance with the practices outlined in my co-pending application Serial No. 59,625, filed January 17, 1936.

My process consists broadly of arranging the stock on edge with a portion horizontally disposed overlapping the next adjacent strip of stock; and of impregnating the stock with car'- bon dioxide gas under pressure; and thereafter applying the necessary heat as described in my co-pending application to bring about curing and vulcanization of the sponge rubber stock in sponge condition and of regulating that sponge as to its character and nature by the regulation of the escape of the carbon dioxide gas.

For instance, I find I am enabled to bring the pressure of impregnation up to 140 pounds to a square inch and gradually decrease it to zero while using a temperature as indicated.

When it is desired to make the stock of rubber denser in other areas, I have found such expedients as loading with clay, whiting and blanc fix, and even increasing the proportion of carbon black, a satisfactory means of increasing the density of the stock. Any of the Well known methods of increasing the density of stock may be employed. Those I mention are merely typical.

It is understood that where the term diiferent densities is used there is meant not only the change in mass per unit volume but also those changes in physical properties resulting in. increased strength, resilience and resistance to defiection as may be obtained by the skillful compounder.

It will be understood that I desire to comprehend within my invention such modifications as come within the scope of my claim and my invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

In a method of forming a homogeneous sponge rubber body comprising sections of varying densities, arranging stock rubber sheets of diiferent physical properties in overlapping position with horizontal and vertical portions enclosing mold projections with the vertical portions of the stock arranged between the mold projections; enclosing the mold in an atmosphere of carbon dioxide gas 7 under pressure; and so regulating the temperature to which the stock and mold are subjected and the rate of escape of the carbon dioxide gas that a homogeneous body of sponge rubber of predetermined configuration having certain integral sections of different physical properties and densities is formed.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2472060 *Oct 22, 1945May 31, 1949Berdge K BeylerianMethod of simulating surface structures
US2538880 *Jan 5, 1946Jan 23, 1951Paul R RobellCushion
US2595964 *Jul 8, 1949May 6, 1952Us Rubber CoMethod of vulcanizing sponge rubber
US2611926 *Jan 5, 1951Sep 30, 1952Us Rubber CoApparatus for vulcanizing frothed latex rubber
US2845997 *Mar 9, 1954Aug 5, 1958Curtiss Wright CorpFoamed plastic seat and the like
US2849058 *Sep 19, 1955Aug 26, 1958Bulleri LeonettoArmchair, sofa or the like, made up entirely of a resiliently yieldable material without any carrier framework
US2983963 *Jul 17, 1956May 16, 1961Electrolux AbMethod of making multidensity expanded plastic body
US3020587 *Apr 3, 1958Feb 13, 1962Sterling Alderfer CompanyProcess and apparatus for the manufacture of sealing strips or gaskets
US3043627 *Nov 3, 1959Jul 10, 1962Torjusen RudolfArticle of furniture
US3046004 *Oct 4, 1957Jul 24, 1962Joseph J KleinCushion and method of making the same
US3110938 *Nov 25, 1960Nov 19, 1963Gen Motors CorpSealing strip
US3144493 *Oct 19, 1959Aug 11, 1964Owens Illinois Glass CoMethod of forming partly foamed plastic articles
US3287748 *Mar 2, 1964Nov 29, 1966Dayco CorpFoam rubber product and method of manufacture
US3311681 *Oct 28, 1960Mar 28, 1967American Can CoMethod of extruding a foamed plastic sheet having a skin on one surface
US3320339 *Oct 23, 1963May 16, 1967Dayco CorpMethod of manufacturing foam rubber articles
US3325834 *Dec 28, 1965Jun 20, 1967Earl W HillInner spring body supporting article and method of making the same
US3393258 *Oct 23, 1963Jul 16, 1968Dayco CorpMethod of molding unitary foam rubber articles
US3393259 *Nov 10, 1966Jul 16, 1968Dayco CorpFoam rubber method
US3423490 *Apr 20, 1966Jan 21, 1969Dayco CorpMethod of manufacturing unitary foam rubber articles
US3516901 *Mar 27, 1967Jun 23, 1970Dayco CorpFoam rubber article
US4045830 *Mar 24, 1975Sep 6, 1977Societe Nationale Des Poudres Et ExplosifsSystem of protection by modeling
US4327046 *Dec 7, 1979Apr 27, 1982Southern Research InstituteMethod for producing a rigid, shaped mass support system
US4493488 *Feb 16, 1982Jan 15, 1985Panaia David JPressure control wheel chair seat
US4709431 *Dec 2, 1985Dec 1, 1987Shaktman Donald HDual crowned hemorrhoid support seat cushion
US4828325 *Sep 29, 1987May 9, 1989University Of Tennessee Research CorporationMethod of making a custom fitted composite foamed cushion, a preform kit and the resultant product of the process
US4989284 *Oct 12, 1989Feb 5, 1991The Kendall CompanyCushion
US6142573 *Nov 6, 1997Nov 7, 2000Everest & Jennings Canadian LimitedCushion element for use in a wheelchair
US6733084Feb 5, 2003May 11, 2004Moeller Marine ProductsBoat comfort seat assembly
US8486316Apr 29, 2010Jul 16, 2013Sapsa Bedding S.R.L.Process and plant for the continuous manufacturing of at least a layer of latex foam with recesses
US20110104446 *Apr 29, 2010May 5, 2011Sapsa Bedding SrlProcess and plant for the continuous manufacturing of at least a layer of latex foam with recesses
EP2316627A1 *Apr 19, 2010May 4, 2011Sapsa Bedding S.R.L.Process and plant for the continuous manufacturing of at least a layer of latex foam with recesses
WO2015147268A1 *Mar 27, 2015Oct 1, 2015株式会社東洋シートSeat cushion
U.S. Classification264/46.4, 264/50, 264/DIG.110, 264/241, 297/DIG.100, 5/653, 297/452.27
International ClassificationA47C7/18
Cooperative ClassificationY10S264/11, Y10S297/01, A47C7/18
European ClassificationA47C7/18