Second stage tire building machine utilizing bladderless former sleeve

• US 6,012,500 A
• Filed: 01/23/1998
• Issued: 01/11/2000
• Est. Priority Date: 01/23/1998
• Status: Expired due to Term

• Current Assignee: Bridgestone Firestone North American Tire LLC (Bridgestone Corporation)
• Original Assignee: Bridgestone Firestone North American Tire LLC (Bridgestone Corporation)
• Inventors: Connor, Thomas M.
• Primary Examiner(s): Knable, Geoffrey L.
• Application Number:
  US09/012,251
• Time in Patent Office: 718 Days
• Field of Search: 156/132, 156/131, 156/135, 156/398, 156/403, 156/414, 156/415, 156/416
• US Class Current: 156/398
• CPC Class Codes: B29D 2030/3214 Locking the beads on the drum; details of the drum in the bead locking areas, e.g. drum shoulders
• CPC Class Codes: B29D 30/246 Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum expansion to a toroidal shape B29D30/36
• CPC Class Codes: B29D 30/36 Expansion of tyres in a flat form , i.e. expansion to a toroidal shape independently of their building-up process, e.g. of tyres built by the flat-tyres method or by jointly covering two bead-rings

Abstract

A bladderless former sleeve (100) is disclosed for a bladderless second stage tire building machine (102) having at least one bead lock assembly (116), the bead lock assembly (116) having an annular clamp (114) with an annular groove (112). The sleeve (100) includes an annular main body (104) having first (106) and second (108) ends, the main body (104) having a thickness. A bead (110) is attached to the annular main body (104) at the first end (106). The bead (110) has a thickness substantially greater than the thickness of the main body (104) at the second end (108). The bead (110) is sized to fit snugly within the groove (112) of the clamp (114). The main body (104) of the sleeve (100) is sized to substantially cover the bead lock assembly (116) or at least the bead lock shoes (120) of the machine (102) during operation of the machine when the bead lock shoes (120) are in a fully expanded position.

Claims

1. A bladderless second stage tire building machine, comprising:

a main shaft;

first and second bead lock assemblies, each of said bead lock assemblies including a clamp and a plurality of expandable bead lock shoes, said expandable bead lock shoes movable between retracted and expanded positions;

said first and second bead lock assemblies selectively movable between first and second positions, said second position being inward of said first position;

said bead lock assemblies closer to each other in said second position than when in said first position;

said second stage tire building machine being free of a bladder extending between the first and second bead lock assemblies;

a bladderless former sleeve disposed over each of said bead lock assemblies;

said bladderless former sleeve including an annular main body having first and second ends, said main body disposed over said expandable bead lock shoes with said first end held in said clamp and said second end being loose.

2. A bladderless second stage tire building machine according to claim 1 wherein the first end of each of said sleeves is substantially thicker than the second end.

3. A bladderless second stage tire building machine according to claim 1 wherein each of the sleeves is substantially flexible and is formed of an elastomeric material.

4. A bladderless second stage tire building machine according to claim 3 wherein each of the sleeves has a longitudinal length, said length of said sleeves sized such that the sleeves substantially surround said expandable bead lock shoes in both of the retracted and expanded positions and extend outboard of the bead lock shoes.

5. A bladderless second stage tire building machine according to claim 1 wherein each of the clamps has an annular groove.

6. A bladderless second stage tire building machine according to claim 5 wherein each of the sleeves includes an annular bead formed at the first end of the sleeve, said beads being received in the grooves of the clamps.

7. In combination, a bladderless second stage tire building machine and a tire carcass;

said second stage tire building machine, comprising a main shaft;

first and second bead lock assemblies, each of said bead lock assemblies including an inboard clamp and a plurality of expandable bead lock shoes, said expandable bead lock shoes movable between retracted and expanded positions; and

a bladderless former sleeve disposed over each of said bead lock assemblies;

said bladderless former sleeve including an annular main body having first and second ends, said main body disposed over said expandable bead lock shoes;

each of said bead lock assemblies being free of an outboard clamp;

said first and second bead lock assemblies selectively movable between first and second positions, said second position being inward of said first position;

said bead lock assemblies closer to each other in said second position than when in said first position;

said second stage tire building machine being free of a bladder extending between the first and second bead lock assemblies;

said tire carcass having a pair of annular bead ring ends;

said main bodies of said sleeves being clamped between said bead ring ends and said expandable bead lock shoes when said bead lock shoes are in said expanded position; and

said second end of said sleeve being loose.

8. The combination according to claim 7 wherein the first end of each of the former sleeves is held in the clamp of a respective one of the bead lock assemblies.

9. The combination according to claim 8 wherein said sleeve is substantially flexible.

10. The combination according to claim 9 wherein each of the sleeves has a longitudinal length, said length of said sleeves sized such that said sleeves substantially surround the expandable bead lock shoes in both of the retracted and expanded positions.

11. The combination according to claim 8 wherein each of the clamps has an annular groove.

12. The combination according to claim 11 wherein each of the sleeves includes an annular bead formed adjacent the first end of said sleeve, said bead being received in the groove of a respective one of the clamps.