To provide a brake device that can inhibit reverse rotation of a ratchet wheel even if a switching knob is erroneously operated in a winding-down direction during hoisting, and a lever hoist and a ratchet mechanism.SOLUTION: A ratchet mechanism comprises a ratchet wheel 80 with a plurality of ratchet teeth 83 formed on an external periphery, and at least two claw members 90 which engage with the ratchet teeth 83. The ratchet mechanism thus allows rotation of the ratchet wheel 80 in only one direction. The ratchet teeth 83 include high teeth 831 and low teeth 832, and high teeth 831 and low teeth 832 are alternately arranged on the ratchet wheel 80. When one claw member 90 is engaged with a trough part 833 located between neighboring ratchet teeth 83, at least another claw member 90 is simultaneously engaged with another trough part 833 which is located between the neighboring ratchet teeth 83.SELECTED DRAWING: Figure 4

    【課題】巻上げに際して切換ツマミを誤って巻下げ方向側へと操作した場合でも、爪車の逆転を阻止することが可能なブレーキ装置、レバーホイストおよびラチェット機構を提供する。【解決手段】外周に複数のラチェット歯83が形成された爪車80と、該ラチェット歯83と噛み合う少なくとも2つの爪部材90と、を備えることで一方向のみへの爪車80の回転を許容するラチェット機構であって、ラチェット歯83には、高歯831と、低歯832とが存在し、爪車80には、高歯831と低歯832とが交互に設けられており、一つの爪部材90が隣り合うラチェット歯83の間に位置する谷部833に係合しているときに、少なくとも他の一つの爪部材90が隣り合うラチェット歯83の間に位置する他の谷部833と同時に係合する。【選択図】図4


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    Title :

    RATCHET MECHANISM


    Additional title:

    ラチェット機構


    Contributors:

    Publication date :

    2024-05-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B66D Haspeln , CAPSTANS / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen



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