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US3701273A - Method of making footwear - Google Patents

Method of making footwear Download PDF

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Publication number
US3701273A
US3701273A US120078A US3701273DA US3701273A US 3701273 A US3701273 A US 3701273A US 120078 A US120078 A US 120078A US 3701273D A US3701273D A US 3701273DA US 3701273 A US3701273 A US 3701273A
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US
United States
Prior art keywords
welt
sole
last
lasting
string
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US120078A
Other languages
English (en)
Inventor
Horace R Auberry
Anton Liebscher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ro Search Inc
Original Assignee
Ro Search Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ro Search Inc filed Critical Ro Search Inc
Application granted granted Critical
Publication of US3701273A publication Critical patent/US3701273A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/0054—Producing footwear by compression moulding, vulcanising or the like; Apparatus therefor
    • B29D35/0063—Moulds
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B15/00—Welts for footwear
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B9/00—Footwear characterised by the assembling of the individual parts
    • A43B9/04—Welted footwear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
    • B29D35/061—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D35/00—Producing footwear
    • B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
    • B29D35/065—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by compression moulding, vulcanising or the like

Definitions

  • ABSTRACT I Related Application Data The invention refers to the manufacture of shoes with [63] Continuation-impart of Ser. No. 34,003, May pp lasted y Pulling a String secured to the lasting 4, 197() margin of the upper. Improvements are presented which reduce costs of manufacture especially if the [52] U.S. Cl ..12/145 sole is m d d r tly t the upper. The method of [51] Int. Cl.
  • KNOWN ART lt is customary to stitch a string to the edge of the lasting margin of an upper, to place then the upper on a last and to tighten the string to pull the lasting margin onto the sole surface of the last until the desired lasting effect is obtained in the judgment of the operator, whereupon the string is knotted.
  • the lasting string is secured to the lasting margin of the upper together with a welt strip, preferably by a single stitching.
  • the upper is then placed upon a last with stops on the sole surface of said last, which might be pins.
  • the lasting string is then tightened until it and the lasting margin abut the pins. This eliminates the need for skilled workers and assures that no overlasting occurs.
  • a sole comprising elastomeric material is to be molded directly to the upper, it is preferred to provide a continuous rim inside of the feather edge of the last, which then not only provides a stop to prevent overlasting, but also a sealing wall to prevent the escape of elastomeric material into the interior of the shoe.
  • the open groove in the sole can be filled. It is further preferred to create the rim by providing in the last a retractable sole plate which projects inwardly of the feather edge of the last into the sole space. After molding the sole shell, the sole plate of the last might be retracted without removing the last from the mold so as to permit the formation of a porous filler of the sole. Such retractable plate might be at least partially replaced by a membrane.
  • an inside stop for the lasting margin allows the use of a completely prefinished welt, be it leather, rubber, etc. which in the mold will be touching the side wall of the mold cavity.
  • the spacing between the stop for the inner edge of the welt and the side wall of the cavity can be selected to fit exactly the dimensions of the prefinished welt.
  • No elastomeric material, be it rubber or other elastomeric material, will then penetrate between the outside of the welt and the mold wall and there will be no need for buffing or other finishing of the sole edge.
  • the deformation of the last for sealing purposes is useful not only for the prevention of spew on the inside of the sole, but can be provided also for the outside of the shoe.
  • the invention provides a slight projection outwardly on the outside of the last above the feather edge thereof.
  • the lip of the side wall of the mold is arranged slightly above said projection so that the material of the upper is squeezed between said lip and said projection.
  • the projection might also be created by providing a recess in the last. After removal of the finished shoe from the last, the resiliency of the upper will straighten the curvature existing in the upper and no inconvenience will be experienced by the wearer of the shoe.
  • This arrangement is also useful for shoes with high foxing, such as basketball shoes.
  • FIG. 1 is a cross section of a shoe according to the invention, while in a molding device for elastomeric soles; 7
  • FIG. 2 shows in a similar cross-section, a shoe with a high foxing
  • FIGS. 3 and 4 are cross-sections of other embodiments of the invention.
  • FIG. 5 is a section through the heel part
  • FIG. 6 is a section through the sole edge.
  • FIG. 1 shows the upper 1 on the last 2.
  • a strip 3 such as a prefinished welt, and a lasting string 4 are fastened by a stitching 5.
  • the last 2 has a recess 6 into which a last sole plate 7 can be withdrawn.
  • the side walls 8 of the sole forming cavity with the lip 9 close as usual by a sideways movement (parallel to the sole surface).
  • a bottom plate 10 is used to mold the outer sole.
  • the edge 12 of the last sole plate 7 serves during the lasting of the upper as a stop for the inner edge of the lasting margin and prevents the overlasting of the upper.
  • the plate 7 can be withdrawn into the space 6 to make room for a pillow such as formed by expanding a mix for porous rubber.
  • FIG. 2 shows a similar arrangement with not only a deformation of the last at its sole surface to act as a stop and for sealing purposes, but'also a deformation on the outside of the last corresponding to the upper edge of a desired foxing.
  • the deformation is a recess 14 covered by the upper 1.
  • the sealing pressure is then increased by the molding pressure. Sufficient sealing pressure can be obtained in this manner with very little sideways pressure against the material of the upper by the lip plate, thus without damage to the upper.
  • the upper After separating the lip plate from the upper on completion of the molding of the sole the upper returns to its normal position, as shown in dotted lines at 15.
  • the last 2 has in its body a heating element 18 so that the preferably previously mulled upper 1 can be heated while on the last to a temperature high enough to cause the upper ,to shrink to a tight and permanent fit.
  • the sole plate 20 of the last is separated from the body of the last by the space 23 by means of spacers 21 to keep the lasting margin of the upper at a lower temperature which does not prevent the setting of thermoplastic sole material injected into the mold cavity.
  • Deformations on the last sole plate such as the rim 22 preventing overlasting and projections 29 which fill partially the mold cavity for sole weight reduction, greater resiliency, and comfort, help to manufacture a better shoe at lower costs.
  • Deformations on the last such as pins 16 or projections 17 serve to locate the upper rim of the upper.
  • the bottom of the sole cavity might comprise, as shown in FIG. 4, a rim part and a center part 31 independently of each other movable towards and away from the last bottom. This allows eithei to mold first the rim part of the sole while the center part 31 presses the lasting margin of the upper againstthe last, or to flatten the welt against the cavity wall by the rim part 30 while molding the center part of the sole.
  • FIG. 4
  • the side wall of the mold cavity has a rib 27 to bend the margin of the strip 3 into the elastomeric sole material as shown at 27.
  • the lasting string 4 is stitched only to the strip 3, preferably before stitching the strip 3 to the lasting margin 11. It is preferred to use extruded elastomeric material for the strip 3.
  • such extrusion might be rounded and have a hollow core 34.
  • One stitching 35 might secure the extrusion to the upper 1 while the stitching 36 secures the lasting string 4 to the horizontal leg of the extrusion 3.
  • Holding means such as a rim 38 connected to the mold bottom 37 hold the extrusion 3 in place during the injection of the elastomeric sole material into the cavity.
  • FIG. 6 shows a section through the heel area of a shoe in which the strip 3 is extended to form the heel cover 40, stitched with the lasting string to the upper.
  • Holding means 41 are used to give the heel cover the desired shape on the outside of the heel.
  • a heel filler 42 reduces the amount of elastomeric material for the heel.
  • Other holding means 43 shape the heel breast, while connected to the sole plate 44 of the mold. Projections 46 of the holding means locating in grooves of the plate 44 with tapered walls, or projections of the plate, as shown at 48, with grooves in the holding means as shown at 47, secure the correct position of these means during molding. If undercuts are present, as shown, the holding means are separated from the bottom plate before they are removed from the shoe.
  • the holding means are preferably interconnected, or connected to a mold side frame.
  • the invention allows not only by suitable selection of the strip stitched to the upper to reduce the costs of manufacture, as the use of finished extrusions, braids, etc., is far less expensive than ornamentation of the sole rim after molding, but by the use of extrusions, etc. covering at least the major part of the side surface of the sole rim higher wear resistance of the shoe is obtained. Further, the weight reduction of the sole of FIG. 3 and the heat set obtained while the upper is on the mold last improve the quality of the shoe.
  • the entire bottom part of the mold cavity 30 and 31 can be advanced to the rib 26 to mold the invisible part of the elastomeric sole, and in a second step withdrawn to mold the tread sole which then will be also visible at the side surface of the sole rim.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
US120078A 1971-03-02 1971-03-02 Method of making footwear Expired - Lifetime US3701273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12007871A 1971-03-02 1971-03-02

Publications (1)

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US3701273A true US3701273A (en) 1972-10-31

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Application Number Title Priority Date Filing Date
US120078A Expired - Lifetime US3701273A (en) 1971-03-02 1971-03-02 Method of making footwear

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US (1) US3701273A (de)
DE (1) DE2209870C3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909862A (en) * 1973-04-26 1975-10-07 Ro Search Inc Footwear and its manufacture
US4003145A (en) * 1974-08-01 1977-01-18 Ro-Search, Inc. Footwear
US5152025A (en) * 1988-07-29 1992-10-06 Sergio Hirmas Method for manufacturing open-heeled shoes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017211251B4 (de) * 2017-07-03 2023-05-25 Adidas Ag Aufleisten mit einem Faden

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US495455A (en) * 1893-04-11 Patrick cunningham
US1934352A (en) * 1932-09-17 1933-11-07 William G Heiber Method of making shoes
US3007184A (en) * 1958-06-11 1961-11-07 United Shoe Machinery Corp Improvements in methods of molding outsoles to shoes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US495455A (en) * 1893-04-11 Patrick cunningham
US1934352A (en) * 1932-09-17 1933-11-07 William G Heiber Method of making shoes
US3007184A (en) * 1958-06-11 1961-11-07 United Shoe Machinery Corp Improvements in methods of molding outsoles to shoes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3909862A (en) * 1973-04-26 1975-10-07 Ro Search Inc Footwear and its manufacture
US4003145A (en) * 1974-08-01 1977-01-18 Ro-Search, Inc. Footwear
US5152025A (en) * 1988-07-29 1992-10-06 Sergio Hirmas Method for manufacturing open-heeled shoes

Also Published As

Publication number Publication date
DE2209870C3 (de) 1981-10-01
DE2209870A1 (de) 1973-02-15
DE2209870B2 (de) 1981-02-05

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