Process of and apparatus for manufacturing bladders used for tire building machine

• US 4,462,850 A
• Filed: 11/08/1982
• Issued: 07/31/1984
• Est. Priority Date: 11/09/1981
• Status: Expired due to Fees

• Current Assignee: Bridgestone Tire Company Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Tire Company Limited (Bridgestone Corporation)
• Inventors: Fukunaga, Takeshi, Tajima, Kunio
• Primary Examiner(s): Boland, Lois E.
• Application Number:
  US06/439,814
• Time in Patent Office: 631 Days
• Field of Search: 156/113, 156/112, 156/118, 156/125, 156/132, 156/133, 156/110.1, 156/401, 156/412, 156/416, 92/92, 92/103 F, 264/299, 264/320, 425/35, 425/501, 425/393, 425/403, 152/349, 152/350, 152/352 R, 152/352 A, 152/353, 152/357 A
• US Class Current: 156/110.1
• CPC Class Codes: B29D 2030/2614 Bladders associated with the building drum, e.g. bladders used for the toroidal expansion, bladders for turning-up the plies
• CPC Class Codes: B29D 22/02 Inflatable articles
• CPC Class Codes: B29D 30/26 Accessories or details, e.g. membranes, transfer rings

Abstract

A process of manufacturing a bladder which is to be disposed on each of axially opposite end portions of a tire building machine having a tire building drum, respectively, and is employed for turning back a ply cord bound on the tire building drum of the tire building machine, comprising of the steps of binding a bladder material on a cylindrical member, the bladder material being reinforced with cords and unvulcanized, the cylindrical member having two annular grooves formed in the outer peripheral portion thereof, binding a cloth belt containing water around the outer peripheral surface of the bladder material so that the bladder material is shaped conformingly to the outer peripheral portion of the cylindrical member and the two annular grooves, vulcanizing in a vulcanizing vessel the bladder material to form two annular ridges on the bladder material conformingly to the shape of the annular groove, and taking out the bladder material from the vulcanizing vessel and turning back the bladder material around the lines of the annular ridges formed on the cylindrical member in such a manner that the annular ridge protrudes outwardly of the bladder material.

Claims

1. A process of manufacturing a bladder which is to be disposed on each of axially opposite end portions of a tire building machine having a tire building drum, respectively, and employed for turning back a ply cord bound on the tire building drum of the tire building machine, comprising of the steps of:

binding a bladder material on a cylindrical member, the bladder material being reinforced with cords and unvulcanized, the cylindrical member having two annular grooves formed in the outer peripheral portion thereof,

binding a cloth belt containing water around the outer peripheral surface of said bladder material so that said bladder material is shaped conformingly to the outer peripheral portion of said cylindrical member and said two annular grooves,

vulcanizing in a vulcanizing vessel said bladder material to form two annular ridges on said bladder material conformingly to the shape of said annular grooves, and

taking out said bladder material from the vulcanizing vessel and turning back said bladder material around the lines of said annular ridges formed on said cylindrical member in such a manner that said annular ridges protrude outwardly of said bladder material.