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    • 1. 发明授权
    • Press and safety latch therefor
    • 按压和安全锁定
    • US4007679A
    • 1977-02-15
    • US669209
    • 1976-03-22
    • Bobbie Lee Edwards
    • Bobbie Lee Edwards
    • B29C33/20B29C33/26B29C44/42B29C67/24B30B1/32
    • B29C33/26B29C44/428B29C2037/94B29C33/20B29C67/246B29K2075/00
    • A press mechanism that is powered by hydraulic, electrical and/or pneumatic means is provided with an improved ratchet and pawl machine which acts as a fail-safe device should any of the power means fail to lock the press parts in place. The fail-safe device includes a ratchet in the form of a circular or arcuate segment mounted with its circular center substantially coaxial with one of the turning parts of the mechanism or press, a pawl having a single tooth and a circular arcuate peripheral part that acts as a journal bearing and which in turn is supported by a pawl bearing which in turn is secured to a stationary part of the mechanism and has an arcuate journal which receives and supports the pawl therein. Tremendous load carrying capacity is thus achieved because of the large bearing area provided by the pawl bearing and the positioning of the respective ratchet and pawl teeth to employ a surface rather than point contact. An advantage of this structure is that the ratchet does not have to be backed off in order to move or continue moving one part of the mechanism.
    • 由液压,电气和/或气动装置驱动的压力机构设置有改进的棘轮和棘爪机器,如果任何动力装置不能将压力部件锁定在适当位置,则其作为故障保护装置。 故障保护装置包括呈圆形或弧形段形式的棘轮,其安装有其圆形中心与机构或压机的一个转动部分基本上同轴,具有单个齿的棘爪和圆弧形周边部分,其作用 作为轴颈轴承,其又由棘爪轴承支撑,棘爪轴承又固定到机构的固定部分,并且具有在其中接收并支撑棘爪的弓形轴颈。 因此,由于棘爪轴承提供的较大的轴承面积和相应的棘轮和棘爪齿的定位采用表面而不是点接触,因此实现了巨大的承载能力。 这种结构的优点在于,为了移动或继续移动机构的一部分,棘轮不必被退回。