| 摘要 |
A safety device of an air balancing hoist according to the present invention is provided to instantaneously brake a reel drum in the manner that a braking pawl mounted to be rotatable on an end cap is pushed to the outside direction of the circumference of a circle by centrifugal force to be locked into a ratchet wheel fixed on the end cap when the reel drum is suddenly fast rotated during a hoisting process. The safety device of the air balancing hoist comprises a housing including a chamber in which compressed air is induced/discharged; a piston connected into the inside of the housing to be slidably reciprocated; a ball screw penetrating the piston and including both ends fixed not to be rotated in the housing; a reel drum rotated along the ball screw upon movement; a ratchet wheel in a ring shape mounted on an inner side surface of an end cap formed at one end of the housing; a braking rotor mounted in the center of the end cap to be rotatable; a braking shaft, wherein one end is fixed on the rotor and the other end is connected with a fixing hole of the reel drum; and a braking pawl, wherein one end is elastically inserted in the braking rotor to be pivotable in the circumferential direction and the other end is fixed by a hinge on the braking rotor.
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