Apparatus for vulcanizing pneumatic vehicle tires

• US 5,129,802 A
• Filed: 09/05/1990
• Issued: 07/14/1992
• Est. Priority Date: 01/30/1988
• Status: Expired due to Fees

• Current Assignee: Continental AG
• Original Assignee: Continental AG
• Inventors: Hoops, Klaus, Nadler, Heinrich, Hanebuth, Klaus, Sergel, Horst
• Primary Examiner(s): Silbaugh, Jan H.
• Assistant Examiner(s): VARGOT, MATHIEU D
• Application Number:
  US07/579,276
• Time in Patent Office: 678 Days
• Field of Search: 425/22, 425/23, 425/25, 425/36, 425/38, 425/48, 425/52, 425/58, 425/32, 425/39, 425/33, 425/173, 264/315, 264/326
• US Class Current: 425/36
• CPC Class Codes: B29D 2030/0621 to seal the bead portions against the mould i.e. by using pressing devices
• CPC Class Codes: B29D 2030/0626 the pressing devices being one-piece devices
• CPC Class Codes: B29D 2030/0627 the pressing devices being ring-shaped
• CPC Class Codes: B29D 30/0601 Vulcanising tyres; Vulcanising presses for tyres
• CPC Class Codes: B29D 30/0606 Vulcanising moulds not integral with vulcanising presses for solid tyres B29D30/02
• CPC Class Codes: B29D 30/0629 with radially movable sectors

Abstract

An apparatus for vulcanizing a pneumatic vehicle tire, the beads of which, in a mounted state, are disposed on the radially inner periphery of a wheel rim. A tire blank, with the beads displaced laterally outwardly, is vulcanized using a heating press that is provided with two axially displaceable contour rings for forming the inner regions of the tire beads, and a heating bellows. To facilitate introduction of the tire blank and to protect the heating bellows, it is proposed, for loading the heating press, to axially move the contour rings together, into a position above a vulcanizing position, in such a way that the evacuated heating bellows moves downwardly through a space defined by the lower contour ring. The tire blank is subsequently placed over the contour rings, accompanied by a slight oval deformation of the lower tire bead, and is subsequently fixed on the contour rings by increasing the axial spacing therebetween. At the same time, the heating bellows passes into the interior of the blank. The tire blank is subsequently lowered and vulcanized.

Claims

1. In an apparatus for vulcanizing a pneumatic vehicle tire, the tire beads of which, in a mounted state, are disposed on the radially inner periphery of a wheel rim, and including, for vulcanizing a raw tire blank, with the tire beads being displaced laterally outwardly, a heating press that is provided with tire tread and sidewall mold parts for the outer areas of said tire blanks, two axially displaceable contour rings to form the inner regions of said tire beads, and a heating bellows, the improvement in combination therewith wherein:

said contour rings include an upper contour ring and a lower contour ring which can be moved into a loading position above a vulcanization position, in which said upper and lower contour rings are positioned adjacent to one another, to provide adequate space for mounting of a green tire relative thereto, said lower contour ring having an annular disk-like configuration;

upper heating bellows clamping means and lower heating bellows clamping means, said upper heating bellows clamping means comprising a retaining plate secured to an upper end of an axially movable piston rod, and with said upper contour ring being connected to said retaining plate;

an axially displaceable bellows head to which said lower heating bellows clamping means is connected, with said upper heating bellows clamping means being positioned above, said lower heating bellows clamping means at all times during operation to prevent folding and inversion of said heating bellows; and

axially displaceable support means located radially outwardly of said upper and lower heating bellows clamping means to which said lower contour ring is secured, with said support means and said bellows head and said piston rod being arranged at a bottom portion of said mold parts and being displaceable relative to one another;

with said piston rod as well as said support means, and said bellows head being operatively connected with one another so that said upper contour ring and said lower contour ring automatically are moved along with said bellows head with said piston rod being further movable independently from said bellows head from said loading position to an upper position for stretching said heating bellows and to said loading position which is below said upper position; and

with said support means being further movable independently from said bellows head from said loading position to said upper position and from said upper position to said loading position by said upper contour ring.

2. An in combination according to claim 1, in which said movable piston rod, said bellows head, and said support means are coupled with one another in such a way that when said bellows head is shifted, said piston rod and said support means are moved along therewith.

3. An in combination according to claim 1, in which said movable piston rod, said bellows head, and said support means are coupled with one another in such a way that when said support means is shifted, said piston rod and said bellows head are moved along therewith.

4. An in combination according to claim 1, in which said support means is a barrel that surrounds said bellows head.

5. An in combination according to claim 4, in which said support means is a metallic barrel.

6. An in combination according to claim 4, in which at least a front side of said barrel is provided with a window-like opening.

7. An in combination according to claim 1, in which said support means comprises at least two support columns.

8. An in combination according to claim 1, in which said heating bellows defines an upper and a lower opening, with said upper opening having a diameter that is greater than the diameter of said lower opening.

9. An in combination according to claim 1, in which said heating bellows defines an upper and a lower opening, with said upper opening having a diameter that is smaller than the diameter of said lower opening.