Abstract:
An expandable tire building drum, having alternating fixed (226, 326, 426) and expanding (228, 328, 428) segments (e.g., 24 of each) in a center section (220, 320, 420) of the drum. The expanding segments are axially-extending and circumferentially spaced from one another, and are contoured (have recesses, or grooves) to accommodate tire components such as sidewall inserts. Two different mechanisms for expanding the center section are described. A first mechanism includes two wedge elements (358) which are axially moveable away from one another to expand the center section. Ramp elements (348) associated with the expanding segments (328) may thus be moved radially outward. Rubber bands (358) provide a restoring force for collapsing the center section. A second mechanism includes two guide rings (458) which are axially moveable towards one another for expanding the center section, and away from one another to collapse the center section. Overlapping links (462, 464) are provided between the guide rings and a support element (448) supporting the expanding segments (428).
Abstract:
An expandable tire building drum, having alternating fixed (226, 326, 426) and expanding (228, 328, 428) segments (e.g., 24 of each) in a center section (220, 320, 420) of the drum. The expanding segments are axially-extending and circumferentially spaced from one another, and are contoured (have recesses, or grooves) to accommodate tire components such as sidewall inserts. Two different mechanisms for expanding the center section are described. A first mechanism includes two wedge elements (358) which are axially moveable away from one another to expand the center section. Ramp elements (348) associated with the expanding segments (328) may thus be moved radially outward. Rubber bands (358) provide a restoring force for collapsing the center section. A second mechanism includes two guide rings (458) which are axially moveable towards one another for expanding the center section, and away from one another to collapse the center section. Overlapping links (462, 464) are provided between the guide rings and a support element (448) supporting the expanding segments (428).
Abstract:
A tire building drum has a center section (720) and two end sections (722,724). Each end section is provided with an expandable bead lock assembly (726). The center section is preferably expandable. The expandable bead lock assembly comprises a carrier ring (CR) and a plurality of elongate links (K) extending between the carrier ring (CR) and a plurality of radially-expandable segments (S). When the carrier ring moves inward (towards the center section), the radially-expandable segments (S) move radially outward, urging a plurality of axially extending, circumferentially spaced-apart finger segments (F) outward from a collapsed position to an expanded position, and at least one position therebetween. In an embodiment of the invention, the bead lock assembly comprises a cylinder and two pistons (P1, P2) disposed within the cylinder. The pistons are free to move axially within the cylinder, in response to pneumatic pressure. The first piston (P1) is constrained from moving axially inward by rods (R1P1,R2P1,R3P1). The second piston (P2) is connected by rods (R1P2,R2P2,R3P2) to the carrier ring (CR). Pressurized air supplied through hoses (H1,H2,H3) and passageways in the cylinder (73) control the movement of the pistons (P1,P2) so that the beach lock assembly can be partially-expanded, fully-expanded, and retracted, unexpanded position.
Abstract:
A tire building drum has a center section (720) and two end sections (722,724). Each end section is provided with an expandable bead lock assembly (726). The center section is preferably expandable. The expandable bead lock assembly comprises a carrier ring (CR) and a plurality of elongate links (K) extending between the carrier ring (CR) and a plurality of radially-expandable segments (S). When the carrier ring moves inward (towards the center section), the radially-expandable segments (S) move radially outward, urging a plurality of axially extending, circumferentially spaced-apart finger segments (F) outward from a collapsed position to an expanded position, and at least one position therebetween. In an embodiment of the invention, the bead lock assembly comprises a cylinder and two pistons (P1, P2) disposed within the cylinder. The pistons are free to move axially within the cylinder, in response to pneumatic pressure. The first piston (P1) is constrained from moving axially inward by rods (R1P1,R2P1,R3P1). The second piston (P2) is connected by rods (R1P2,R2P2,R3P2) to the carrier ring (CR). Pressurized air supplied through hoses (H1,H2,H3) and passageways in the cylinder (73) control the movement of the pistons (P1,P2) so that the beach lock assembly can be partially-expanded, fully-expanded, and retracted, unexpanded position.
Abstract translation:轮胎成型鼓具有中心部分(720)和两个端部部分(722,724)。 每个端部设置有可膨胀的胎圈锁组件(726)。 中心部分优选是可扩张的。 可膨胀胎圈锁组件包括承载环(CR)和在承载环(CR)和多个径向可扩展段(S)之间延伸的多个细长连杆(K)。 当承载环向内(朝向中心部分)向内移动时,径向可扩张的段(S)径向向外移动,从而将多个沿轴向延伸的周向间隔开的指状区段(F)从折叠位置向外推动到扩张位置 ,以及其间的至少一个位置。 在本发明的一个实施例中,胎圈锁组件包括一个缸体和两个设置在气缸内的活塞(P 1,P 2)。 响应于气动压力,活塞在气缸内自由移动。 第一活塞(P 1)受到杆(R 1 P 1,R 2 P 1,R 3 P 1)的轴向向内的约束。 第二活塞(P 2)通过杆(R 1 P 2,R 2 P 2,R 3 P 2)连接到载体环(CR)。 通过软管(H 1,H 2,H 3)和气缸(73)中的通道供应的加压空气控制活塞(P 1,P 2)的运动,使得海滩锁组件可以部分地膨胀, 展开和缩回,未展开的位置。
Abstract:
The disclosed bladder (10) is useful in ambient temperature fabrication of rubber parts and components. Due to the particular combination of construction materials used, the bladder has excellent release properties and results in improved manufacturing uniformity. At least one portion of the bladder (10) is formed from a lack tack, high abrasion resistant polyurethane. The polyurethane may comprise a ring-shaped portion (26) of the bladder surface or an entire end (20) of the bladder.