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Publication numberUS2931110 A
Publication typeGrant
Publication dateApr 5, 1960
Filing dateFeb 26, 1957
Priority dateFeb 26, 1957
Publication numberUS 2931110 A, US 2931110A, US-A-2931110, US2931110 A, US2931110A
InventorsPietrocola Roberto
Original AssigneePietrocola Roberto
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sole and heel unit for shoes and the like
US 2931110 A
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Description  (OCR text may contain errors)

April 1960 R. PIETROCOLA 2,931,110

sou: AND HEEL UNIT FOR SHOES AND THE LIKE Filed Feb. 26, -1957 2 Sheets-Sheet 1 April 5, 1960 R. PIETROCOLA SOLE AND HEEL unrr Fox saoss AND ms LIKE 2 Sheets-Sheet 2 Filed Feb. 26, 1957 United dtates SOLE AND EEEL UNIT FOR SHOES AND THE LIKE Roberto Pietrocola, Milan, Italy Application February 26, 1957 Serial No. 642,516

1 Claim. (Cl. 36-30) This invention relates to frames for shoes and the like and, more particularly, to units comprising soles and heels.

It is an object of the invention to provide an improved unit having a heel and sole formed of one piece of material so as to facilitate manufacture.

The difficulty inherent in such an arrangement is that, since one piece of material is involved, it is hard to combine the different properties essential to both the heel and the sole. Never-the-less, the invention does provide a very practical unit and in so doing combines, for example, the normally incompatible requirements of rigidity for the heel with flexibility for the sole and strength of the frame with comfort for the foot and so forth.

In achieving the above and other of its objectives, the invention proposes heel, shank and sole portions which are all of a single piece of relatively rigid material so that the heel may have substantial structural strength. To provide the sole, which is also of said rigid material, with the necessary flexibility, the invention proposes a system of openings at least one of which constitutes a recess at the top of the sole. Finally, to provide comfort for the foot, a resilient material is accommodated in the openings to support said foot. As a feature of the invention, this resilient material is also used for ground or floor contact.

The structure of the invention is ideally suited for ladies shoes wherein the high heels must have suitable strength while, at the same time, the sole must be flexible.

Other objects and features of the invention will be found in the following detailed description as illustrated in the accompanying drawing in which:

Fig. 1 represents a mould wherein, by an injection process, there is moulded a frame provided in accordance with the invention.

Fig. 2 represents a second mould for the injection moulding of the above-noted resilient material.

Fig. 3 represents, on an enlarged scale, a cross-section of the frame obtained from the second mould.

Figs. 4, 5 and 6 represent three different forms of sole which can be obtained with the illustrated moulds.

Figs. 7 and 8 represent different forms of heels suitable for the frame of the invention.

The mould shown in Fig. 1, for producing the portion of the frame made of the relatively rigid material, is made in two parts 1, 2. For sake of simplicity, the mould is shown as having a single cavity, but it could have several cavities, so as to allow the moulding of several frames at a time. The mould is provided in the usual way with a gate 3 for injecting the plastic material. This mould serves for the whole frame, inclusive of the heel, and is used with a tough and substantially non-resilient plastic material, such as polyamide, a high molecular wei ht or low pressure polyethylene, or a polypropylene. In correspondence with the upper sole portion, the mould has a protruding portion 4, having a plurality of bosses 5, which will produce in the moulded frame corresponding through 2,931,110 figs Patented ARJY- 5, 1969 holes. Similar bosses 5 are also provided in the lower portion of the mould and serve to obtain an enlarged recess in each through hole. When the two parts of the mould are closed together the plastic material is injected through the gate 3 and the plastic is set in the usual way. The mould provides the moulded frame with the shape shown in dotted lines in Fig. 1 and in solid lines in Fig. 2. The central portion to Fig. 2. As it can be seen in this figure, the frame has a thinned out portion 7, in correspondence of the protruding portion 4, and through holes 8 with enlarged bottom recesses 9 corresponding to bosses 5. The frame or body thus obtained is then placed in the second mould, as represented in Fig. 2, which is made in two parts 11, 12 and provide with the injection gate 13. The lower portion of the mould has cavities 14 which are provided in correspondence with the enlarged portions of the through holes 8. The frame is placed between the two parts of the mould and a plastic material is injected. This plastic material is very resilient and soft and is, for instance, a highly plastified polyvinyl. The two parts of the mould, upon closing, clamp a portion of the sole and precisely that portionhaving the holes 8 with the recesses 9. When the mould is closed so as to exercise a sufficient pressure on the sole, there is injected the plastic material which fills the cavities 9 and the holes 8. The plastic material injected in this second operation takes the shape as represented in Fig. 3. It cannot be separated from the frame or body and bulges out forming the projections 14' on which one walks.

Of course by modifying the moulds and especially the lower portions 11 it is possible to obtain several types of soles, depending from the shape of the cavities 14. Thus, in the mould as represented in Figs. 2. and 3, such recesses are separated from one another, so that in the holes there are obtained single separate circular projections 15, as indicated in Fig. 4. If said recesses 14 are connected to each other by means of grooves, it is possible to obtain soles as represented in Fig. 5 or 6, according to which said channels may be straight or Zig-zag. Of course many other shapes are obtainable so as to vary the protruding portions of the elastic material.

Instead of injecting the plastic material in the second mould, it will also be possible to use natural or synthetic rubber, in which case the rubber has to be vulcanized in a similar mould, provided with heating means. It is thus possible to obtain with the same process soles partially constituted of rubber, by subjecting to vulcanization the whole frame inserted in the second mould. In this case, the sole as represented in Fig. 2 is placed in the part 11 of the mould, and in the same there is placed a suflicient amount of a natural or synthetic rubber compound. Then the mould is closed by applying downward pressure on the upper part 12, and the mould is heated to the temperature required for vulcanizing the rubber. The mould is then closed under pressure for the necessary time for the complete vulcanization of the rubber and then it is opened to extract the finished piece.

In the mould as represented in Fig. 1, the heel is obtained in a single piece with the frame and is shown only schematically. The heel can actually be obtained in 7 the moulding such as by inserting the wooden core in the mould before injecting the plastic material.

Furthermore, the heel may have a cylindrical cavity 22 which serves to receive a small wooden plug 23 onto which is nailed or screwed a replaceable wearing piece 24. This small auxiliary wearing part can thus be easily changed when worn.

The frames or bodies obtained by the described methods offer the following advantages:

(1) Possibility of obtaining rigid heels and flexible soles both of the same piece of material.

(2) Good ground adherence with no danger of slipping,

(3) Silent tread.

(4) Maximum wearing resistance of the sole.

In general, the constructive details of the moulds, and of the frames may vary according to needs without departing from the field of the present invention. 7

What I claim is:

An. integral sole and heel unit comprising a sole portion, a high heel portion, a shank-portion between the sole and heel portions, all of the portions being of a single piece and of a substantially rigid material so that the heel portion is of substantial structural strength, said sole portion having upper and'lower surfaces and having a recess in the upper surface and a plurality of openings in the lower surface communicating with the recess to render the sole flexible, and a resilient material in said recess and openings to provide comfort for the foot of a wearer as well as means for contacting the ground.

References Cited in the file of this patent UNITED STATES PATENTS Kinsley Oct. 8, 1861 Ellithorpe Sept. 10, 1918 Jones July 11, 1922 Sims June 2, 1925 Perugia Dec. 7, 1926 Hartung June 21, 1927 Bateman July 10, 1928 McQueen Mar. 4, 1930 Westheimer July 25, 1939 Wehr June 6, 1944 Van Der Veen Dec. 21, 1948 Dadisman May 30, 1950 Dratler Mar. 13, 1951 Danielson et al. Aug. 26, 1952 Danielson et a1 Sept. 9, 1952 McCord June 2, 1953 Holt May 15, 1956 Helle Dec. 11, 1956 FOREIGN PATENTS France Nov. 26, 1925 France Apr. 22, 1940 France Nov. 6, 1944 France July 15, 1953

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US33436 *Oct 8, 1861 Improvement in flexible soles
US1278320 *Dec 22, 1916Sep 10, 1918Gilbert S EllithorpeShoe-tread.
US1422716 *Oct 22, 1921Jul 11, 1922Commw Shoe & Leather CompanyShoe sole
US1540430 *May 25, 1922Jun 2, 1925Beverly Sims WilliamInsole for shoes
US1609918 *Mar 13, 1926Dec 7, 1926Andre PerugiaHeel for shoes
US1633324 *Mar 18, 1925Jun 21, 1927Hartung Leonard FDetachable cushion heel
US1677013 *Aug 1, 1927Jul 10, 1928Charles Bateman LouisCompound rubber tread
US1749351 *Aug 23, 1928Mar 4, 1930Alexander McqueenBoot or shoe
US2167035 *Oct 22, 1938Jul 25, 1939Westheimer Max AlbertRubber sole for sandals
US2350852 *May 27, 1941Jun 6, 1944Wilhelm WehrFootwear
US2457015 *May 22, 1946Dec 21, 1948Der Veen Tiemen VanRubber heel
US2509335 *Sep 20, 1946May 30, 1950Harry A DadismanShoe with channel members embedded in sole
US2544878 *Sep 20, 1948Mar 13, 1951Dratler Samuel LHeel construction
US2607957 *Jan 2, 1951Aug 26, 1952Elmer L DanielsonMethod for forming a composite plastic structure
US2609570 *Jan 22, 1951Sep 9, 1952Elmer L DanielsonMethod for forming a multipart plastic article
US2640283 *May 10, 1952Jun 2, 1953Joses MccordBowler's shoe
US2745197 *Sep 9, 1954May 15, 1956Danielson Mfg CompanyMid-sole construction
US2773317 *Jul 13, 1954Dec 11, 1956Boesen Helle JensArticles of footwear
FR601278A * Title not available
FR857713A * Title not available
FR901471A * Title not available
FR1046973A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3375537 *Mar 11, 1966Apr 2, 1968Wenton Shoe Mfg CompanyShoes with moulded soles
US3426120 *Aug 2, 1965Feb 4, 1969Ro Search IncMethod of manufacture of footwear having anti-skid soles
US3492744 *May 9, 1968Feb 3, 1970Wright & Co Inc E TGolf shoe and bottom therefor
US3523379 *Dec 5, 1967Aug 11, 1970Barsamian BarsamProcess for manufacturing shoes
US3547602 *Apr 30, 1968Dec 15, 1970Usm CorpMethod of making mold assemblies
US4186498 *Nov 3, 1977Feb 5, 1980B.M.C.-Brevets-Marques-Chaussures S.A.Sole with high heel for woman footwear, consisting of a plastic material monoblock having a rigid and a flexible part
US4335530 *May 6, 1980Jun 22, 1982Stubblefield Jerry DShoe sole construction
US4414166 *Jan 4, 1982Nov 8, 1983International Business Machines CorporationLaser joining of thermoplastic and thermosetting materials
US4481727 *Jun 21, 1982Nov 13, 1984Pensa, Inc.Shoe sole construction
US4499671 *Jul 23, 1982Feb 19, 1985Giulio SottolanaShoe bottom for general footwear including heel, instep, plantar, support and insole
US4694591 *Apr 15, 1985Sep 22, 1987Wolverine World Wide, Inc.Toe off athletic shoe
US4785557 *Oct 24, 1986Nov 22, 1988Avia Group International, Inc.Shoe sole construction
US4787156 *Nov 2, 1987Nov 29, 1988Kloeckner Ferromatik Desma GmbhSports shoe and methods for making the same
US4899467 *Jul 29, 1988Feb 13, 1990Forest A. PruittComposite outsole
US5373650 *Dec 8, 1993Dec 20, 1994Langer Biomechanics Group, Inc.High-heeled shoe orthotic device
US6108869 *Feb 26, 1998Aug 29, 2000Gillette Canada Inc.Brush handle
US6138734 *Jan 12, 1995Oct 31, 2000Monarch Marking Systems, Inc.Hand-held labeler and method of making same
US6306329 *Aug 11, 1998Oct 23, 2001Randy HangersMethod of molding garment hanger clip
US6641769Mar 27, 2001Nov 4, 2003Global Polymer Industries, Inc.Method of forming composite ultrahigh molecular weight polyethylene material
US6823612 *Jan 10, 2003Nov 30, 2004Adidas International Marketing B.V.Ball and socket 3D cushioning system
US6962008Jan 10, 2003Nov 8, 2005Adidas International Marketing B.V.Full bearing 3D cushioning system
US6983557Aug 9, 2004Jan 10, 2006Adidas International Marketing B.V.Ball and socket 3D cushioning system
US7055266Apr 1, 2002Jun 6, 2006Wayne ElseyElectrostatically dissipative athletic shoe
US7124519Jan 14, 2004Oct 24, 2006Columbia Insurance CompanyShoe sole having improved flexibility and method for making the same
US7140124May 27, 2005Nov 28, 2006Adidas International Marketing B.V.Full bearing 3D cushioning system
US7243445Oct 14, 2005Jul 17, 2007Adidas International Marketing B.V.Ball and socket 3D cushioning system
US7313876 *Apr 12, 2005Jan 1, 2008Wolverine World Wide, Inc.Footwear outsole and method of manufacture
US7418791 *Oct 10, 2002Sep 2, 2008Cole Iii Charles DApparatus and methods for imbedded rubber outer
US7621058Nov 22, 2006Nov 24, 2009Exten.SSole with extensible structure
US7665232Jul 9, 2007Feb 23, 2010Adidas International Marketing B.V.Ball and socket 3D cushioning system
US7704430 *Jun 5, 2006Apr 27, 2010Nike, Inc.Method for making a tread assembly
US7731883Jun 5, 2006Jun 8, 2010Nike, Inc.Method for making a tread assembly
US7814682Sep 9, 2008Oct 19, 2010Nike, Inc.Footwear with separable upper and sole structure
US7950091 *Apr 28, 2010May 31, 2011Nike, Inc.Cleated article of footwear and method of manufacture
US7966751Oct 9, 2009Jun 28, 2011Exten.SSole with extensible structure
US8006411Feb 9, 2010Aug 30, 2011Adidas International Marketing B.V.Ball and socket 3D cushioning system
US8136535 *Jun 12, 2008Mar 20, 2012Kiss Nail Products, Inc.Artificial nail and method of forming same
US8322049 *Jul 30, 2010Dec 4, 2012Nike, Inc.Wear-resistant outsole
US8448648Sep 30, 2010May 28, 2013Kiss Nail Products, Inc.Artificial nail and method of forming same
US8460593 *Jul 15, 2011Jun 11, 2013Nike, Inc.Article of footwear with mesh on outsole and insert
US20110266715 *Jul 15, 2011Nov 3, 2011Nike, Inc.Article of Footwear with Mesh on Outsole and Insert
US20120023781 *Jul 30, 2010Feb 2, 2012Nike, Inc.Wear-resistant outsole
USRE33066 *Aug 22, 1986Sep 26, 1989Avia Group International, Inc.Shoe sole construction
WO1981003112A1 *May 5, 1981Nov 12, 1981J StubblefieldShoe sole construction
WO1989006502A1 *Jan 20, 1989Jul 27, 1989Howard J DananbergHigh heeled shoe design
WO2006024743A1 *Jul 27, 2005Mar 9, 2006Phillipe GuesdonShoe sole
U.S. Classification36/30.00R, 36/34.00R, 264/250, 36/32.00R, 36/59.00R, 264/273, 36/34.00A
International ClassificationA43B13/37, A43B13/00, B29D35/08, B29D35/00
Cooperative ClassificationA43B13/37, B29D35/085, B29D35/081
European ClassificationA43B13/37, B29D35/08C, B29D35/08B