| 摘要 |
An overspeed protective device connected to the rotary shaft (3) of a drive machine in an escalator or a moving walkway is disclosed. The escalator or moving walkway includes a safety switch (9) for controlling electric current to be fed to the machine. The overspeed protective device comprises a rotation unit connected to the rotary shaft (3) so that it rotates with the rotary shaft, said rotation unit including a rotating bottom plate (2), at least one centrifugal weight (14), one end of which is pivotally connected to the rotating bottom plate (2); spring (11), one end of which is connected to the weight (14); and limiting screws (13) provided on each of the two sides of the weight. The overspeed protective device also comprises a control arm unit consisting of a drive rod (16), a slide rod (17) and a bent rod (7), the bent rod (7) comprising a first surface (7-1), a second surface (7-2) and a third surface (7-3), wherein the first surface allows power to be fed to the drive machine when it engages with the safety switch, the second surface prevents power from being fed to the drive machine when it engages with the safety switch, and the third surface is used to prevent the automatic resetting of the safety switch (9).
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