Tire retreading bladder

• US 4,197,064 A
• Filed: 05/02/1979
• Issued: 04/08/1980
• Est. Priority Date: 08/27/1973
• Status: Expired due to Term

• Current Assignee: Louise J. Macmillan
• Original Assignee: Donald Macmillan & Son, Inc.
• Inventors: MacMillan, Kenneth T.
• Primary Examiner(s): Flint, Jr., J. Howard
• Application Number:
  US06/035,207
• Time in Patent Office: 342 Days
• Field of Search: 425/21, 425/22, 425/23, 425/24, 425/25, 425/33, 425/35, 425/43, 425/49, 425/50, 425/51, 425/52, 425/53, 425/58, 425/812, 425/17
• US Class Current: 425/17
• CPC Class Codes: B29C 33/10 with incorporated venting means
• CPC Class Codes: B29C 43/104 the mould cavity lying totally outside the axis of symmetry, e.g. toroidal moulds
• CPC Class Codes: B29C 43/3642 Bags, bleeder sheets or cauls for isostatic pressing
• CPC Class Codes: B29D 2030/0655 Constructional or chemical features of the flexible cores
• CPC Class Codes: B29D 2030/582 Venting air inclusions, e.g. air trapped between tread and carcass
• CPC Class Codes: B29D 30/0654 Flexible cores therefor, e.g. bladders, bags, membranes, diaphragms elastic cores or mandrels for shaping of plastics B29C33/505; bags for isostatic pressing in compression moulding B29C43/12, B29C43/3642
• CPC Class Codes: B29D 30/54 Retreading
• CPC Class Codes: Y10S 425/812 Venting

Abstract

A tire retreading bladder of a generally annular configuration which is U-shaped in cross section as defined by a bight portion and a pair of legs, each terminating at an axially outwardly directed annular sealing bead and having at each terminal edge a plurality of circumferentially spaced valleys through which pressurized air may be introduced into and exhausted from the bladder, means disposed along each of exterior surfaces of the legs for venting air from between such exterior surfaces and an interior surface of an associated tire, and each exterior surface defining between radially inboard portions of each venting means and the associated sealing bead a generally smooth uninterrupted annular sealing surface adapted to form a hermetic line of sealing with an associated bead aligner wheel.

Claims

1. A tire retreading bladder comprising a generally annular member of a U-shaped cross section defined by a bight portion and a pair of legs, said annular member defining an interior volume, each leg terminating in a terminal edge of a generally circular configuration, each terminal edge having an axially outwardly directed annular sealing bead, a plurality of circumferentially spaced valley means opening through said terminal edge into said volume through which pressurized air may be introduced into and exhausted from said volume, each leg having interior and exterior surfaces, means disposed along each of said exterior surfaces for venting air from between such exterior surfaces and an interior surface of an associated tire adapted to receive therewithin said bladder, each of said venting means on each of said exterior surfaces having a radially inboard portion terminating radially short of the associated annular sealing bead, and each exterior surface defining between said radially inboard portions of each venting means and the associated sealing bead a generally smooth uninterrupted annular sealing surface.

2. The bladder as defined in claim 1 wherein said valley means open in an axial direction.

3. The bladder as defined in claim 1 wherein said valley means open in an axial direction and are in axially opposing relationship to each other.

4. The bladder as defined in claim 3 wherein said bladder has a cross-sectional thickness greatest at said beads, and the thickness of said legs diminishes in a direction toward said bight portion.

5. The bladder as defined in claim 3 wherein said venting means include ribs projecting above said exterior surfaces.

6. The bladder as defined in claim 3 wherein said venting means include rib projecting above said exterior surfaces, and said ribs are disposed generally radially.

7. The bladder as defined in claim 4 wherein said venting means include ribs projecting above said exterior surfaces.

8. The bladder as defined in claim 7 wherein said venting means include ribs projecting above said exterior surfaces, and said ribs are disposed generally radially.

9. The bladder as defined in claim 1 wherein said bladder has a cross-sectional thickness greatest at said beads, and the thickness of said legs diminishes in a direction toward said bight portion.

10. The bladder as defined in claim 1 wherein said venting means include ribs projecting above said exterior surfaces.

11. The bladder as defined in claim 1 wherein said venting means include ribs projecting above said exterior surfaces, and said ribs are disposed generally radially.