Provided are a brake device, a lever hoist, and a ratchet mechanism which are capable of preventing backward rotation of a ratchet even when a switching knob has been mistakenly manipulated in the lowering direction during hoisting. A brake device 70 comprises: a brake receiver 71 which is axially supported by a drive shaft 25 in an un-rotatable manner and which is provided with a flange part 71a and a boss part 71b; a female screw member 35 which is axially supported by the boss part 71b and which screws together with a male screw part 26 that is on the outer circumference of the drive shaft 25; a ratchet 80 which is sandwiched between the facing flange part 71a and female screw member 35, and which is provided on the outer circumference side thereof with ratchet teeth 83 that restrict the direction of rotation to one direction; brake plates 72a, 72b which are disposed between the ratchet 80 and at least one of the flange part 71a and the female screw member 35; and a pair of pawl members 90 which engage with the ratchet teeth 83 and which are disposed at positions that have symmetry centered on the drive shaft 25, wherein the ratchet 80 is provided with tall teeth 831 and short teeth 832 that have a lower protruding height from the center than the tall teeth 831.


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    Title :

    Brake device, lever hoist, and ratchet mechanism


    Contributors:

    Publication date :

    2022-11-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66D Haspeln , CAPSTANS



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