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Publication numberUS2251468 A
Publication typeGrant
Publication dateAug 5, 1941
Filing dateApr 5, 1939
Priority dateApr 5, 1939
Publication numberUS 2251468 A, US 2251468A, US-A-2251468, US2251468 A, US2251468A
InventorsSmith Wesley L
Original AssigneeSalta Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rubber shoe sole
US 2251468 A
Images(1)
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Description  (OCR text may contain errors)

Au@ 5, 1941 w. L. SMITH I l 2,251,468

. RUBBER suon soLE Fiiea Apri; 5, v1959 I Il Y lNVENTO R Patented Aug. 5, 1941 RUBBER SHOE SOLE Wesley L. Smith, Bedford, Va., assignor, by mesne assignments, to Salta Corporation, N. J., a corporation of Delaware Jersey City,

Application April 5, 1939, Serial No. 266,155

, 3 Claims.

-This invention relates to rubber shoe soles, and

, aims to provide a sole having good wearing qualities and capable throughout its life of on smooth and wet surfaces.

gripping Inaccordance with my invention, a shoe sole is made from wholly or partially collapsed, 'closed-cell, cellular rubber. Such rubber is made by expanding a mass of soft rubber compound by means of a usual blowing agent under conditions which retain the gases produced by th'e blowing agent in closed cells Within'the mass ofv compound, and then cooling the rubber mass after vulcanization. The cooling has the eiect of condensing or otherwise eliminating the gases produced by the blowing agent, so that the soft vulcanized rubber collapses substantially to the volume whichy it had before expansion. In its collapsed "form, it has about the same degree of resiliency and the same wearing qualities of solid unexpanded soft rubber. Such collapsed-cellular rubberhas been `made as an intermediate product in making sponge rubber, but has generally been regarded as of no value in itself.

i have discovered that when shoe-soles are made of collapsed cellular rubber, they are resillent, strong and durable and have the property of gripping on smooth surfaces vuntil they are completely worn away. This property arises from the fact that wear on the under-surface of a sole made of collapsed cellular rubber opens the collapsed cells near the wearing surface, relieving the vacuum in these cells so that they expand and serve by' a-vacuum cup action to prevent the sole from slipping on smooth surfaces. ThusB a1- thougl'l the sole has only thenormal resiliency of solid soft rubber, its under-surface, as wear continues, consists always of -a thin layer of expanded rubber containing opened cells which serve as vacuumcups.

To prevent the 'sole from slipping 1when it is new, indentatlons .may be molded in tlile undersurface to provide an initial. vacuum cup'iiactiona This is, however, not absolutely necessary-as \col lapsed' cellular rubber has an irregular surface as theresult of the collapsing of the cells, 'which is rough enough to provide some initial vacuum cup action up to the time that the cells begin to be opened by wear.

The accompanying drawing shows a shoe-sole embodying my invention: Fig. 1 is a perspective view of the sole applied to a shoe; Fig..2 is an enlarged diagrammatic vertical section ofthe sole when new, and Fig. 3 is a; similarV section of the sole after part of it has worn away.

The sole illustrated has a. body I of collapsed closed-cell cellular soft rubber and an under-surface which is indented. When the sole is new, slipping is prevented by the vacuum cup action of the Vindentations 3 in the lower surface shown in Fig. 2. After wear, slipping is prevented by the vacuum cup action of the opened and expanded cells 4 near the wearing surface, as shown in Fig. 3. The cells 5 in the body remain co1- lapsed until they are exposed by wear.

The sole which has been described may be made by utilizing4 the rst part of a method which has been used formaking sponge rubber. This method consists in expanding a mass of rubber compound by means of sodium bicarbonate or a similar blowing agent which is mixed with the compoundbefore vulcanization. During the rst part ofthe vulcanization, the rubber compound is conned in a mold having an internal volume no greater than the volume of the compound'. This prevents any substantial evolution of gas within the rubber compound during the first part of the vulcanization and until the rubber compound has acquired a consistency and tensile strength suiiicient to prevent entrapped gas from rupturing it. During the latter part of the vulcanization, the rubber compound is placed f in a larger mold, On release from the first mold,

or during the nal vulcanization from the larger mold, or at both these times, the mass is expanded by gas produced by the blowing agent, so that, at the end of the vulcanization, there is produced a closed-cell cellular soft rubber article having the shape and size of the second mold.

Since the gas produced from sodium bicarbonate or similar blowing agents is of an unstable character, the gasA is condensed or in some way .chemically eliminated from the cells when the expanded article is cooled, so that it collapses and returnsnearly to the size which the compound had before expansion.

In using this method to make a shoe-sole embodying my invention, the mold used in the first part of the 'vulcanization has a thickness substantially equal to that desired in the shoe-sole. The second mold has a thickness several times as great as that of the first mold and, most desircontained in each cell is eliminated on cooling will be apparent to those skilled in the art. while the above-described specitlc embodiment of my invention is the sole of an ordinary shoe,my inventiorl may, without departing from the spirit thereof as defined in the appended claims, be inf y'after expansion. It is to be understood that, as

conlalnlng almost wholly collapsed closed cells.

2. A shoe sole having'a. tread portion adapted to be exposed by wear comprlsins a ylayer oi.' substantially solid rubber containing almost wholly collapsed closed cells. y

3. A shoe tread comprising a layer adapted to be exposed by wear consistlngvof substantially solid rubber containing almost wholly collapsed closed cells. l

WESIEYLSMITH.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2527414 *Dec 12, 1949Oct 24, 1950Simon Hallgren KarlRubber sole for footwear
US2757461 *Jul 30, 1954Aug 7, 1956Us Rubber CoFloatable slip-resistant shoe
US3031777 *Jun 15, 1961May 1, 1962Al LehmanBowling shoes
US3590410 *Jul 26, 1968Jul 6, 1971Walk On CorpBoot tree
US3726028 *Jun 3, 1971Apr 10, 1973Stokes HDevice for negotiating inclined surfaces
US4398357 *Jun 1, 1981Aug 16, 1983Stride Rite International, Ltd.Outsole
US4494320 *Nov 18, 1982Jan 22, 19858-Track Shoe Corp.Shoe outsole
US5247741 *Mar 6, 1992Sep 28, 1993Suave Shoe CorporationFootwear having a molded sole
US5542196 *Jun 2, 1995Aug 6, 1996Donna Karan Shoe CompanyInsole
US5909948 *Apr 4, 1994Jun 8, 1999Ellis, Iii; Frampton E.Shoe sole structures
US6115945 *Dec 3, 1993Sep 12, 2000Anatomic Research, Inc.Shoe sole structures with deformation sipes
US6591519Jul 19, 2001Jul 15, 2003Anatomic Research, Inc.Shoe sole structures
US6609312Dec 3, 1993Aug 26, 2003Anatomic Research Inc.Shoe sole structures using a theoretically ideal stability plane
US6662470Oct 12, 2001Dec 16, 2003Anatomic Research, Inc.Shoes sole structures
US6668470Jul 20, 2001Dec 30, 2003Anatomic Research, Inc.Shoe sole with rounded inner and outer side surfaces
US6708424Aug 28, 2000Mar 23, 2004Anatomic Research, Inc.Shoe with naturally contoured sole
US6729046Oct 12, 2001May 4, 2004Anatomic Research, Inc.Shoe sole structures
US6748674Nov 6, 2002Jun 15, 2004Anatomic Research, Inc.Shoe sole structures using a theoretically ideal stability plane
US6763616Aug 22, 2001Jul 20, 2004Anatomic Research, Inc.Shoe sole structures
US6877254Nov 13, 2002Apr 12, 2005Anatomic Research, Inc.Corrective shoe sole structures using a contour greater than the theoretically ideal stability plane
US7082697Jun 7, 2004Aug 1, 2006Anatomic Research, Inc.Shoe sole structures using a theoretically ideal stability plane
US7093379Nov 8, 2002Aug 22, 2006Anatomic Research, Inc.Shoe sole with rounded inner and outer side surfaces
US7127834Apr 11, 2003Oct 31, 2006Anatomic Research, Inc.Shoe sole structures using a theoretically ideal stability plane
US7168185Oct 22, 2003Jan 30, 2007Anatomic Research, Inc.Shoes sole structures
US7174658May 16, 2005Feb 13, 2007Anatomic Research, Inc.Shoe sole structures
US7287341Aug 19, 2004Oct 30, 2007Anatomic Research, Inc.Corrective shoe sole structures using a contour greater than the theoretically ideal stability plane
US7310894 *May 12, 2005Dec 25, 2007Schwarzman John LFootwear for use in shower
US7334356Jul 12, 2005Feb 26, 2008Anatomic Research, Inc.Shoe sole structures
US7546699Apr 23, 2007Jun 16, 2009Anatomic Research, Inc.Shoe sole structures
US7647710Jul 31, 2007Jan 19, 2010Anatomic Research, Inc.Shoe sole structures
US8141276Nov 21, 2005Mar 27, 2012Frampton E. EllisDevices with an internal flexibility slit, including for footwear
US8205356Nov 21, 2005Jun 26, 2012Frampton E. EllisDevices with internal flexibility sipes, including siped chambers for footwear
US8256147May 25, 2007Sep 4, 2012Frampton E. EliisDevices with internal flexibility sipes, including siped chambers for footwear
US8291618May 18, 2007Oct 23, 2012Frampton E. EllisDevices with internal flexibility sipes, including siped chambers for footwear
US8494324May 16, 2012Jul 23, 2013Frampton E. EllisWire cable for electronic devices, including a core surrounded by two layers configured to slide relative to each other
US8561323Jan 24, 2012Oct 22, 2013Frampton E. EllisFootwear devices with an outer bladder and a foamed plastic internal structure separated by an internal flexibility sipe
US8567095Apr 27, 2012Oct 29, 2013Frampton E. EllisFootwear or orthotic inserts with inner and outer bladders separated by an internal sipe including a media
US8670246Feb 24, 2012Mar 11, 2014Frampton E. EllisComputers including an undiced semiconductor wafer with Faraday Cages and internal flexibility sipes
US8732230Sep 22, 2011May 20, 2014Frampton Erroll Ellis, IiiComputers and microchips with a side protected by an internal hardware firewall and an unprotected side connected to a network
US8732868Feb 12, 2013May 27, 2014Frampton E. EllisHelmet and/or a helmet liner with at least one internal flexibility sipe with an attachment to control and absorb the impact of torsional or shear forces
DE968597C *Dec 28, 1951Mar 6, 1958Romika Kg Lemm & CoSchuhsohle, insbesondere fuer Sportschuhe
DE977268C *Dec 15, 1951Sep 9, 1965Lonza AgVerfahren zum Herstellen von Zellkoerpern mit geschlossenen Zellen aus thermoplastischen Kunststoffen
Classifications
U.S. Classification36/32.00R, 521/92, 521/150, 36/59.00C
International ClassificationA43B13/14, A43B13/22
Cooperative ClassificationA43B13/22
European ClassificationA43B13/22