| CPC A62B 35/0093 (2013.01) | 7 Claims |
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1. A fall arrester, comprising:
a holder which comprises a first arm and a second arm;
a rotating drum which is pivotally provided on the holder and located between the first arm and the second arm; the rotating drum comprises a main body and at least one pawl, wherein the main body has an accommodating part and a setting part; the accommodating part is provided to be wound by a flexible long strip; the at least one pawl has a first abutting portion and is pivotally provided on the setting part; when the rotating drum rotates at a rotating speed which is equal to or greater than a predetermined rotating speed, the first abutting portion of the at least one pawl pivots from a first position to a second position;
a braking module which has a convex portion and is fixed to the first arm by the convex portion so that the braking module is located between the first arm and the setting part; the braking module further has a plurality of second abutting portions which are located on a rotation path of the first abutting portion in the second position, wherein the rotation path is formed by the rotation of the rotating drum; the second abutting portions can abut against the first abutting portion;
wherein the braking module comprises a cover, a friction plate, and a ratchet plate, which are coaxially set in order; the ratchet plate has the plurality of second abutting portions on a periphery thereof, and further has an accommodation space for holding the friction plate and the cover, wherein the cover and the ratchet plate are fixedly connected to each other and clamp the friction plate therebetween; the friction plate has the convex portion which makes the friction plate be fixed to the first arm; when the rotating drum rotates at a rotating speed greater than or equal to the predetermined rotating speed, which makes the first abutting portion move to the second position and abut against the second abutting portions, the cover and the ratchet plate rotate relative to the friction plate, which is driven by the rotating drum, and moreover, the cover and the ratchet plate generate frictional resistance with the friction plate respectively so as to stop the rotation of the rotating drum;
wherein both the cover and the ratchet plate have a circular hole at a center thereof respectively; the friction plate has a non-circular hole at a center thereof, and a maximum inner diameter of the non-circular hole is less than or equal to a minimum inner diameters of the circular holes; the second arm comprises a shaft pole passing through the rotating drum and the braking module; the shaft pole has a non-cylindrical section which matches the non-circular hole, so that the friction plate is fixed to the shaft pole, and the cover and the ratchet plate is rotatable relative to the friction plate;
wherein the friction plate comprises a friction part and a non-circular hole part; the friction part has a first convex block on an axial direction thereof, and the non-circular hole part has a second convex block on an axial direction thereof; the first convex block and the convex portion are respectively located on two opposite sides of the friction part; the first convex block and the second convex block are connected to each other along the axial direction with dislocation.
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