Patent ID: 9556009
Date: 2017-01-31
CPC Classifications: B66D

Claim:
1. A labor-saving device for detection of no-load hand hoist motion, comprising a base, a stand pole, and a controller, a first cantilever beam, a second cantilever beam, a third cantilever beam, and a fourth cantilever beam being sequentially disposed in single vertical plane from top to bottom of the stand pole, the labor-saving device being characterized in that: a electric hoist is disposed below the first cantilever beam; a pair of first guide units is respectively disposed at two opposite laterals of the second cantilever beam; a driving unit including a motor, a stand plate, and an actuator being coaxially disposed in series from internal to external, is disposed above the third cantilever beam; the actuator includes an active wheel and two pressure regulator, the active wheel being configured to be a chain wheel or friction wheel, the two pressure regulator being symmetrically disposed at two opposite laterals of the active wheel and formed in the same plane thereof; each pressure regulator includes a passive wheel, an immovable frame, a movable frame, and a spring, a screw rod, a sleeve, a hand wheel, as well as a shaft pin, the passive wheel being configured to be a friction wheel is disposed within the movable frame, the movable frame is disposed within immovable frame, the immovable frame being disposed onto the stand plate; two elongated grooves, through which the shaft pin connected with the passive wheel traverses, are respectively formed in the mutually same portion of the front and rear lateral of the immovable frame; a circular hole is formed in the lateral far from the active wheel of the immovable frame, the screw rod is configured to fasten its one end with the lateral far from the active wheel of the movable frame and traverse another end through said circular hole in the immovable frame, the spring and the sleeve sequentially are suited on the screw rod, a protruded end of the screw rod from the sleeve is secured and screwed up by the hand wheel; a pair of second guide units is respectively disposed at two opposite laterals of the fourth cantilever beam.