| 摘要 |
The bead breaker for vehicle tires involves a hydraulic jack member whose base is attached to a bead pressing member and whose extendable head is connected by tension members, such as a chain and hook combination, to the wheel. The bead pressing member may have alternative configurations, one being an adjustable split presser assembly comprising a presser arm, attached to the jack base, upon whose opposing extended arms are slidingly mounted adjustable sleeves. Attached to each radially adjustable sleeve is an arcuate presser section which presses downward against the tire bead when the jack head is extended, breaking the bead. In the alternative bead pressing member, the presser arm, attached to the jack base, is removably attached to a ring presser member, which presses against the tire bead along a full 360-degree circumference. A larger bead pressing ring is concentrically attached to a smaller ring, so as to allow the ring presser member to be readily reversed for application to either a larger or a smaller wheel. Springs may be used between the jack base and the extendable jack head to retract the jack head upon release of hydraulic pressure. A chain retractor, in the form of a rubber sleeve or a coil spring, may assist in retaining hook-wheel connections.
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