A chain block is provided including a load chain which hangs a load, and a load sheave member which is rotatably supported between a first frame and a second frame, around which the load chain is wound, and which has a chain pocket in which the load chain goes, the load chain is made of a steel material having the Rockwell hardness C scale (HRC) of 47 to 51, and the load sheave member is made of a steel material in which at least the chain pocket has the Rockwell hardness C scale (HRC) of 40 to 45.

A chain block is provided including a load chain which hangs a load, and a load sheave member which is rotatably supported between a first frame and a second frame, around which the load chain is wound, and which has a chain pocket in which the load chain goes, the load chain is made of a steel material having the Rockwell hardness C scale (HRC) of 47 to 51, and the load sheave member is made of a steel material in which at least the chain pocket has the Rockwell hardness C scale (HRC) of 40 to 45.

A hoist with built-in load sensitive automatic speed change device includes: a high-torque input member coupled to a hand wheel, a magnetic clutch coupled via a speed-increasing mechanism and configured to transmit a low load, and an output transmitting means configured to transmit a rotational operating force of the hand wheel to mechanical brakes via the high-torque input member or magnetic clutch, wherein the hand wheel is axially supported by a drive member coupled to the output transmitting means of the mechanical brakes and rotated thereby, the magnetic clutch is arranged between the speed-increasing mechanism and the hand wheel, the hand wheel and the speed-increasing mechanism are coupled by a hollow input member provided so as to cover the outer periphery of the magnetic clutch, the output transmitting means is fitted onto a boss portion of the drive member so as to allow torque transmission to the boss portion.

A hoist with built-in load sensitive automatic speed change device includes: a high-torque input member coupled to a hand wheel, a magnetic clutch coupled via a speed-increasing mechanism and configured to transmit a low load, and an output transmitting means configured to transmit a rotational operating force of the hand wheel to mechanical brakes via the high-torque input member or magnetic clutch, wherein the hand wheel is axially supported by a drive member coupled to the output transmitting means of the mechanical brakes and rotated thereby, the magnetic clutch is arranged between the speed-increasing mechanism and the hand wheel, the hand wheel and the speed-increasing mechanism are coupled by a hollow input member provided so as to cover the outer periphery of the magnetic clutch, the output transmitting means is fitted onto a boss portion of the drive member so as to allow torque transmission to the boss portion.

A labor-saving device for detection of no-load hand hoist motion, including 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. Specifically, the electric hoist being disposed below the first cantilever beam; a pair of first guide unit being 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, being disposed above the third cantilever beam; and a pair of second guide unit are respectively disposed at two opposite laterals of the fourth cantilever beam.

A labor-saving device for detection of no-load hand hoist motion, including 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. Specifically, the electric hoist being disposed below the first cantilever beam; a pair of first guide unit being 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, being disposed above the third cantilever beam; and a pair of second guide unit are respectively disposed at two opposite laterals of the fourth cantilever beam.

A lifting mechanism device having an electric or pneumatic motor and two link members has two chain wheels, which are arranged beside each other on a shaft, which is driven by the motor, wherein each chain wheel is used to guide in each case a portion of a link chain with alternately horizontal links and vertical links, that is to say, having pockets for receiving horizontal links and having a groove which extends in the circumferential direction for receiving vertical links. The chain wheels are arranged in a rotationally secure manner with respect to each other in an angular position in the same direction in which the angle pockets of the two chain wheels are located offset with respect to each other by only a distance parallel with the shaft, but are not rotated with respect to each other.

A lifting mechanism device having an electric or pneumatic motor and two link members has two chain wheels, which are arranged beside each other on a shaft, which is driven by the motor, wherein each chain wheel is used to guide in each case a portion of a link chain with alternately horizontal links and vertical links, that is to say, having pockets for receiving horizontal links and having a groove which extends in the circumferential direction for receiving vertical links. The chain wheels are arranged in a rotationally secure manner with respect to each other in an angular position in the same direction in which the angle pockets of the two chain wheels are located offset with respect to each other by only a distance parallel with the shaft, but are not rotated with respect to each other.

A lifting gear has a load chain sprocket and a drive shaft. The drive shaft drives the load chain sprocket. The lifting gear has a motor having a motor shaft. The motor shaft and the drive shaft are coupled by a brake clutch system. The brake clutch system includes a clutch part and a brake hub on a brake thread of the drive shaft. The clutch part has dogs and the brake hub has pegs. A vane disk is between the clutch part and the brake hub. The vane disk has vane bodies on a coupling portion of the drive shaft. A pressure plate is positioned in a rotationally fixed manner on the drive shaft. Two friction disks are between the brake hub and the pressure plate, and a brake disk is between the two friction disks, and the brake disk is mounted in a rotationally fixed manner.

A lifting gear has a load chain sprocket and a drive shaft. The drive shaft drives the load chain sprocket. The lifting gear has a motor having a motor shaft. The motor shaft and the drive shaft are coupled by a brake clutch system. The brake clutch system includes a clutch part and a brake hub on a brake thread of the drive shaft. The clutch part has dogs and the brake hub has pegs. A vane disk is between the clutch part and the brake hub. The vane disk has vane bodies on a coupling portion of the drive shaft. A pressure plate is positioned in a rotationally fixed manner on the drive shaft. Two friction disks are between the brake hub and the pressure plate, and a brake disk is between the two friction disks, and the brake disk is mounted in a rotationally fixed manner.