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
  • B29D35/12—Producing parts thereof, e.g. soles, heels, uppers, by a moulding technique
  • B29D35/122—Soles
• • A—HUMAN NECESSITIES
  • A43—FOOTWEAR
  • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
  • A43B13/00—Soles; Sole-and-heel integral units
  • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
  • A43B13/12—Soles with several layers of different materials
• • A—HUMAN NECESSITIES
  • A43—FOOTWEAR
  • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
  • A43B13/00—Soles; Sole-and-heel integral units
  • A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
  • A43B13/22—Soles made slip-preventing or wear-resisting, e.g. by impregnation or spreading a wear-resisting layer
  • A43B13/223—Profiled soles

Definitions

• This invention relates to inserts in the tread surfaces of outsoles.
• the invention features an outsole comprising a first sole component of oldable material, 15 and at least one other sole component around which is molded the first sole component, the other sole component forming at least a portion of the wear surface of the outsole.
• the invention features . 20 cutting an insert component, applying an adhesive to the one surface of the insert component, rigidly securing the insert component within a mold with the one surface facing upward, closing the mold, and injecting moldable material, at elevated temperature into the mold, thereby ⁇ • 25 allowing the moldable material to flow around and, in cooling, adhere to, the insert component.
• the moldable material is thermoplastic rubber; the insert component is open cell crepe rubber; the surface of the insert component 30 opposite the one surface is deskidded prior to insertion of the insert component in the mold; the insert component is uniformly approximately between 1/4 and 3/16 of an inch thick; and the durometer value of the insert component is greater than that of the moldable 35material.
• Fig. 1 is- a plan view of the wear surface of an outsole embodying the invention.
• Fig. 2 is a sectional view taken at 2-2 of Fig. 1.
• Fig. 3 is an isometric view of the upper surface of said outsole.
• Fig. 4 is an enlarged isometric view of a portion of the tread component of said outsole.
• outsole 10 has open-cell crepe rubber insert 12 (uniformly 1/4 to 3/16 of an inch thick) , surrounded by thermoplastic rubber
• TPR transcranial pressure sole component 14
• the upper surface of sole component 14 includes a plurality of apertures 16 which provide weight reduction and some shock absorption, as described in the application of Vijay K. Batra, "Outsole", Serial No. 270,795, filed June 1,
• insert 12 has transverse slits 18, formed in the manner described in U.S. Patent Nos. 3,124,986, 2,206,860 or 2,284,309, which extend inwardly of the wear surface of the insert, but which do not extend throughout its thickness.
• slits 18 improve the anti-slipping properties imparted to the sole by the open cells 20 of the crepe rubber, but the weight of the sole is reduced by the presence of apertures 16.
• the outsole is made by first cutting, from a sheet of open-cell crepe rubber (uniformly approximately 1/4 to 3/16 of an inch thick) , one surface of which has been deskidded by slitting as described above, the piece to be used as insert 12.
• the unslit surface of insert 12 is then cleaned using a chlorinating solution (such as 3212 Upaco Satrate) , and thereafter, there is applied to that surface a suitable cement (e.g., Upaco 2108 or 3801) , which is allowed to dry.
• a suitable cement e.g., Upaco 2108 or 3801
• a minimum drying period of 8 hours in ambient conditions should be allowed, the preferred period being 16 hours. Should any warpage or distortion of insert 12 occur as a result of the application of the cement, the insert may be warmed to approximately 75°-90°F, to enable manual or mechanical restoration to its original shape.
• insert 12 is placed, with the unslit cemented surface upward, in a mold (not shown) , having any conventional means for retaining the insert in a predetermined position within the mold, and having portions to produce apertures 16 in the upper surface of the heel portion of sole component 14.
• a mold not shown
• liquid TPR e.g. E heart FM 72
• the TPR is allowed to cool and solidify for approximately 90 seconds, after which period the mold is opened, and outsole 10 removed.
• the preferred ranges for durometer values for the crepe rubber and the TPR are, respectively, 72-75 and 50-55.
• the durometer value for the crepe rubber must be such that, upon injection under pressure of the TPR into the mold, there is substantially no distortion of the crepe rubber insert.
• the heat and liquid state of the TPR, as it is introduced into the mold causes the adhesive to mix with the TPR, and, together, they flow to some degree, into the open cells 20 of the sides and upwardly facing surface of insert 12> thereby effecting an excellent bond between sole component 14 and insert 12.
• Secure bonding is particularly important at junction 22, around the tread surface perimeter of insert 12 which is subjected to significant stress, through flexion, when the outsole is in use. Further, the bonding of insert 12 to sole component 14 during the process of molding the TPR, eliminates a separate bonding step, thus reducing production costs.
• Other embodiments are within the following claims.
• sole component 14 may be of any material capable of being molded as described above, e.g., PVC, polyurethane, or vulcanized rubber; insert 12 may be cut from a non-deskidded sheet of crepe rubber and the deskidding applied to the insert before its insertion into the mold or after the removal of outsole 10 from the mold; and deskidding may be accomplished by means other than slitting.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (2)

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• 1983
  • 1983-04-12 EP EP19830901674 patent/EP0105917A1/de not_active Withdrawn
  • 1983-04-12 WO PCT/US1983/000532 patent/WO1983003528A1/en not_active Ceased

Non-Patent Citations (1)

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