|Publication number||US2931110 A|
|Publication date||5 Apr 1960|
|Filing date||26 Feb 1957|
|Priority date||26 Feb 1957|
|Publication number||US 2931110 A, US 2931110A, US-A-2931110, US2931110 A, US2931110A|
|Original Assignee||Pietrocola Roberto|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (22), Referenced by (82), Classifications (17)|
|External Links: USPTO, USPTO Assignment, Espacenet|
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
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US33436 *||8 Oct 1861||Improvement in flexible soles|
|US1278320 *||22 Dec 1916||10 Sep 1918||Gilbert S Ellithorpe||Shoe-tread.|
|US1422716 *||22 Oct 1921||11 Jul 1922||Commw Shoe & Leather Company||Shoe sole|
|US1540430 *||25 May 1922||2 Jun 1925||Beverly Sims William||Insole for shoes|
|US1609918 *||13 Mar 1926||7 Dec 1926||Andre Perugia||Heel for shoes|
|US1633324 *||18 Mar 1925||21 Jun 1927||Hartung Leonard F||Detachable cushion heel|
|US1677013 *||1 Aug 1927||10 Jul 1928||Charles Bateman Louis||Compound rubber tread|
|US1749351 *||23 Aug 1928||4 Mar 1930||Alexander Mcqueen||Boot or shoe|
|US2167035 *||22 Oct 1938||25 Jul 1939||Westheimer Max Albert||Rubber sole for sandals|
|US2350852 *||27 May 1941||6 Jun 1944||Wilhelm Wehr||Footwear|
|US2457015 *||22 May 1946||21 Dec 1948||Der Veen Tiemen Van||Rubber heel|
|US2509335 *||20 Sep 1946||30 May 1950||Harry A Dadisman||Shoe with channel members embedded in sole|
|US2544878 *||20 Sep 1948||13 Mar 1951||Dratler Samuel L||Heel construction|
|US2607957 *||2 Jan 1951||26 Aug 1952||Elmer L Danielson||Method for forming a composite plastic structure|
|US2609570 *||22 Jan 1951||9 Sep 1952||Elmer L Danielson||Method for forming a multipart plastic article|
|US2640283 *||10 May 1952||2 Jun 1953||Joses Mccord||Bowler's shoe|
|US2745197 *||9 Sep 1954||15 May 1956||Danielson Mfg Company||Mid-sole construction|
|US2773317 *||13 Jul 1954||11 Dec 1956||Boesen Helle Jens||Articles of footwear|
|FR601278A *||Title not available|
|FR857713A *||Title not available|
|FR901471A *||Title not available|
|FR1046973A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3375537 *||11 Mar 1966||2 Apr 1968||Wenton Shoe Mfg Company||Shoes with moulded soles|
|US3426120 *||2 Aug 1965||4 Feb 1969||Ro Search Inc||Method of manufacture of footwear having anti-skid soles|
|US3492744 *||9 May 1968||3 Feb 1970||Wright & Co Inc E T||Golf shoe and bottom therefor|
|US3523379 *||5 Dec 1967||11 Aug 1970||Barsamian Barsam||Process for manufacturing shoes|
|US3547602 *||30 Apr 1968||15 Dec 1970||Usm Corp||Method of making mold assemblies|
|US4186498 *||3 Nov 1977||5 Feb 1980||B.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 *||6 May 1980||22 Jun 1982||Stubblefield Jerry D||Shoe sole construction|
|US4414166 *||4 Jan 1982||8 Nov 1983||International Business Machines Corporation||Laser joining of thermoplastic and thermosetting materials|
|US4481727 *||21 Jun 1982||13 Nov 1984||Pensa, Inc.||Shoe sole construction|
|US4499671 *||23 Jul 1982||19 Feb 1985||Giulio Sottolana||Shoe bottom for general footwear including heel, instep, plantar, support and insole|
|US4694591 *||15 Apr 1985||22 Sep 1987||Wolverine World Wide, Inc.||Toe off athletic shoe|
|US4785557 *||24 Oct 1986||22 Nov 1988||Avia Group International, Inc.||Shoe sole construction|
|US4787156 *||2 Nov 1987||29 Nov 1988||Kloeckner Ferromatik Desma Gmbh||Sports shoe and methods for making the same|
|US4899467 *||29 Jul 1988||13 Feb 1990||Forest A. Pruitt||Composite outsole|
|US5373650 *||8 Dec 1993||20 Dec 1994||Langer Biomechanics Group, Inc.||High-heeled shoe orthotic device|
|US6108869 *||26 Feb 1998||29 Aug 2000||Gillette Canada Inc.||Brush handle|
|US6138734 *||12 Jan 1995||31 Oct 2000||Monarch Marking Systems, Inc.||Hand-held labeler and method of making same|
|US6306329 *||11 Aug 1998||23 Oct 2001||Randy Hangers||Method of molding garment hanger clip|
|US6641769||27 Mar 2001||4 Nov 2003||Global Polymer Industries, Inc.||Method of forming composite ultrahigh molecular weight polyethylene material|
|US6823612 *||10 Jan 2003||30 Nov 2004||Adidas International Marketing B.V.||Ball and socket 3D cushioning system|
|US6962008||10 Jan 2003||8 Nov 2005||Adidas International Marketing B.V.||Full bearing 3D cushioning system|
|US6983557||9 Aug 2004||10 Jan 2006||Adidas International Marketing B.V.||Ball and socket 3D cushioning system|
|US7055266||1 Apr 2002||6 Jun 2006||Wayne Elsey||Electrostatically dissipative athletic shoe|
|US7124519||14 Jan 2004||24 Oct 2006||Columbia Insurance Company||Shoe sole having improved flexibility and method for making the same|
|US7140124||27 May 2005||28 Nov 2006||Adidas International Marketing B.V.||Full bearing 3D cushioning system|
|US7243445||14 Oct 2005||17 Jul 2007||Adidas International Marketing B.V.||Ball and socket 3D cushioning system|
|US7313876 *||12 Apr 2005||1 Jan 2008||Wolverine World Wide, Inc.||Footwear outsole and method of manufacture|
|US7418791 *||10 Oct 2002||2 Sep 2008||Cole Iii Charles D||Apparatus and methods for imbedded rubber outer|
|US7621058||22 Nov 2006||24 Nov 2009||Exten.S||Sole with extensible structure|
|US7665232||9 Jul 2007||23 Feb 2010||Adidas International Marketing B.V.||Ball and socket 3D cushioning system|
|US7704430 *||5 Jun 2006||27 Apr 2010||Nike, Inc.||Method for making a tread assembly|
|US7731883||5 Jun 2006||8 Jun 2010||Nike, Inc.||Method for making a tread assembly|
|US7752775||11 Sep 2006||13 Jul 2010||Lyden Robert M||Footwear with removable lasting board and cleats|
|US7770306||23 Aug 2007||10 Aug 2010||Lyden Robert M||Custom article of footwear|
|US7814682||9 Sep 2008||19 Oct 2010||Nike, Inc.||Footwear with separable upper and sole structure|
|US7950091 *||28 Apr 2010||31 May 2011||Nike, Inc.||Cleated article of footwear and method of manufacture|
|US7966751||9 Oct 2009||28 Jun 2011||Exten.S||Sole with extensible structure|
|US8006411||9 Feb 2010||30 Aug 2011||Adidas International Marketing B.V.||Ball and socket 3D cushioning system|
|US8136535 *||12 Jun 2008||20 Mar 2012||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US8209883||8 Jul 2010||3 Jul 2012||Robert Michael Lyden||Custom article of footwear and method of making the same|
|US8322049 *||30 Jul 2010||4 Dec 2012||Nike, Inc.||Wear-resistant outsole|
|US8448648||30 Sep 2010||28 May 2013||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US8460593 *||15 Jul 2011||11 Jun 2013||Nike, Inc.||Article of footwear with mesh on outsole and insert|
|US8671592||13 Sep 2012||18 Mar 2014||Nike, Inc.||Wear-resistant outsole|
|US8807145||21 Aug 2007||19 Aug 2014||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US8813387||3 Dec 2012||26 Aug 2014||Nike, Inc.||Footwear with separable upper and sole structure|
|US8945449 *||21 Apr 2011||3 Feb 2015||Nike, Inc.||Method for making a cleated plate|
|US20040055180 *||10 Jan 2003||25 Mar 2004||Manz Gerd Rainer||Ball and socket 3D cushioning system|
|US20040055182 *||10 Jan 2003||25 Mar 2004||Manz Gerd Rainer||Full bearing 3D cushioning system|
|US20040205981 *||10 Oct 2002||21 Oct 2004||Cole Charles D||Apparatus and methods for imbedded rubber outer|
|US20050013513 *||9 Aug 2004||20 Jan 2005||Adidas International Marketing B. V.||Ball and socket 3D cushioning system|
|US20050022358 *||1 Sep 2004||3 Feb 2005||Hagan Todd A.||Housing with functional overmold|
|US20050028997 *||1 Sep 2004||10 Feb 2005||Hagan Todd A.||Housing with functional overmold|
|US20050061524 *||10 Aug 2004||24 Mar 2005||Hagan Todd A.||Housing with functional overmold|
|US20050150134 *||14 Jan 2004||14 Jul 2005||Issler James E.||Shoe sole having improved flexibility and method for making the same|
|US20050262729 *||27 May 2005||1 Dec 2005||Adidas International Marketing B.V.||Full bearing 3D cushioning system|
|US20060032088 *||14 Oct 2005||16 Feb 2006||Adidas International Marketing B. V.||Ball and socket 3D cushioning system|
|US20060225305 *||12 Apr 2005||12 Oct 2006||Wolverine World Wide, Inc.||Footwear outsole and method of manufacture|
|US20070062069 *||22 Nov 2006||22 Mar 2007||Exten.S||Sole with extensible structure, footwear equipped with same and method for mounting same|
|US20070278714 *||5 Jun 2006||6 Dec 2007||Johnson Jeffrey L||Method for Making a Tread Assembly|
|US20070278716 *||5 Jun 2006||6 Dec 2007||Johnson Jeffrey L||Method for Making a Tread Assembly|
|US20080017211 *||21 Aug 2007||24 Jan 2008||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US20080017212 *||21 Aug 2007||24 Jan 2008||Kiss Nail Products, Inc||Artificial nail and method of forming same|
|US20080017213 *||21 Aug 2007||24 Jan 2008||Kiss Nail Products, Inc||Artificial nail and method of forming same|
|US20080017214 *||21 Aug 2007||24 Jan 2008||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US20080047163 *||9 Jul 2007||28 Feb 2008||Manz Gerd R||Ball and socket 3d cushioning system|
|US20080060228 *||12 Nov 2007||13 Mar 2008||Wolverine World Wide, Inc.||Footwear outsole and method of manufacture|
|US20080251092 *||12 Jun 2008||16 Oct 2008||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US20080263905 *||6 Dec 2007||30 Oct 2008||Chin-Hsing Tai||Outsole with an embedded fabric layer|
|US20090000149 *||9 Sep 2008||1 Jan 2009||Nike, Inc.||Footwear with Separable Upper and Sole Structure|
|US20100139120 *||9 Feb 2010||10 Jun 2010||Adidas International Marketing B.V.||Ball and Socket 3D Cushioning System|
|US20100205756 *||28 Apr 2010||19 Aug 2010||Nike, Inc.||Cleated article of footwear and method of manufacture|
|US20110000104 *||6 Jan 2011||Nike, Inc.||Footwear with Separable Upper and Sole Structure|
|US20110030711 *||10 Feb 2011||Kiss Nail Products, Inc.||Artificial nail and method of forming same|
|US20110219643 *||15 Sep 2011||Treasury Co., Ltd.||Outsole with an embedded fabric layer and method of manufacturing the same|
|US20110266715 *||3 Nov 2011||Nike, Inc.||Article of Footwear with Mesh on Outsole and Insert|
|US20120023781 *||30 Jul 2010||2 Feb 2012||Nike, Inc.||Wear-resistant outsole|
|US20120266490 *||25 Oct 2012||Nike, Inc.||Method For Making A Cleated Plate|
|USRE33066 *||22 Aug 1986||26 Sep 1989||Avia Group International, Inc.||Shoe sole construction|
|WO1981003112A1 *||5 May 1981||12 Nov 1981||J Stubblefield||Shoe sole construction|
|WO1989006502A1 *||20 Jan 1989||27 Jul 1989||Howard J Dananberg||High heeled shoe design|
|WO2006024743A1 *||27 Jul 2005||9 Mar 2006||Phillipe Guesdon||Shoe sole|
|U.S. Classification||36/30.00R, 36/34.00R, 264/250, 36/32.00R, 36/59.00R, 264/273, 36/34.00A|
|International Classification||A43B13/37, A43B13/00, B29D35/08, B29D35/00|
|Cooperative Classification||A43B13/37, B29D35/085, B29D35/081|
|European Classification||A43B13/37, B29D35/08C, B29D35/08B|