Center mechanism of a tire vulcanizer

• US 5,853,769 A
• Filed: 07/07/1997
• Issued: 12/29/1998
• Est. Priority Date: 09/03/1996
• Status: Expired due to Term

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Murakami, Toshifumi, Tohmoto, Keiichi
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): HOPKINS, ROBERT A
• Application Number:
  US08/889,176
• Time in Patent Office: 540 Days
• Field of Search: 425/38, 425/40, 425/48, 425/52, 425/58, 425/400, 425/42, 425/50, 425/28.1
• US Class Current: 425/38
• CPC Class Codes: B29C 33/304 centering cores
• CPC Class Codes: B29D 30/0645 Devices for inserting vulcanising cores, i.e. bladders, into the tyres; Closing the press in combination herewith

Abstract

A center mechanism of a tire vulcanizer in accordance with the present invention has an upper clamp ring for holding the upper opening end of a bladder, a lower clamp ring for holding the lower opening end of the bladder, a lower ring on the lower mold side supporting the lower clamp ring, a spacer installed to the lower ring and having a ventilating portion, and a center post elevating cylinder installed to the spacer. The extending portion of piston rod of the center post elevating cylinder is made a center post, the center post is inserted, in such a manner as to be movable vertically, into a through hole formed in the center of the lower ring and the lower clamp ring, and the upper clamp ring is fixed to the upper end portion of center post protruding upward from the through hole of the lower clamp ring.

Claims

1. A center mechanism of a tire vulcanizer comprising, an upper clamp ring for holding the upper opening end of a bladder, a lower clamp ring for holding the lower opening end of the bladder, a lower ring for supporting said lower clamp ring, a spacer having an upper end portion connected to said lower clamp ring and having a lower end portion connected to an hydraulic center post elevating cylinder, said hydraulic cylinder having a vertically aligned movable piston rod forming, when extended, the center post for the center mechanism, with said center post extending through an opening in both the center of said lower ring and said lower clamp ring to said upper clamp ring and means connecting the upper end of said center post to said upper clamp ring wherein said spacer includes a ventilating window located intermediate the upper and lower end portions thereof to dissipate heat from the center post to the atmosphere external of said bladder during the tire vulcanizing operation.

2. A center mechanism of a tire vulcanizer according to claim 1, wherein the lower end portion of said spacer is connected to a flange provided at the vertical intermediate position of said center post elevating cylinder.