Lifting device

A lifting device, comprising:

• a drive;
• a speed change gear device arranged above the drive and configured to be rotatable by means of the drive;
• a transmission device connected to the speed change gear device, wherein the speed change gear device is fixed to a side wall of the transmission device;
• and
• a lifting mechanism fixed in the transmission device;
• wherein the transmission device comprises:
• a first transmission device fixed to the speed change gear device;
• a second transmission device connected to the first transmission device via a connecting shaft;
• and
• a safety device fixed in the first transmission device and the second transmission device, respectively;
• wherein the safety device is fixed to an end away from the connecting shaft in the first transmission device and the second transmission device, respectively;
• wherein the safety device comprises:
• a lock bracket fixed in a base of the first transmission device and a base of the second transmission device, respectively;
• a bolt arranged in the lock bracket, wherein the bolt penetrates both ends of the lock bracket and is movable along a length of the bolt;
• a locking plate arranged on an upper part of the lock bracket and configured to be overturnable via fixed points on both sides of the lock bracket;
• a return spring located on an outer peripheral surface of the bolt;
• and
• a reset plate arranged at a left side of the lock bracket;
• wherein a limit pin is arranged at a middle of the bolt;
• a U-shaped guide groove is arranged on the lock bracket matching the limit pin;
• the limit pin is arranged in the U-shaped guide groove and is slidable along a length of the U-shaped guide groove;
• and the return spring is arranged between the limit pin and the reset plate.

A lifting device, comprising:

• a drive;
• a speed change gear device arranged above the drive and configured to be rotatable by means of the drive;
• a transmission device connected to the speed change gear device, wherein the speed change gear device is fixed to a side wall of the transmission device;
• and
• a lifting mechanism fixed in the transmission device;
• wherein the drive comprises:
• a housing;
• a first drive shaft arranged on both sides of the housing of the drive;
• a drive wheel;
• a chain-hoist brake device fixed to an outer side the speed change gear device;
• a sprocket attached to an end surface of the chain-hoist brake device;
• and
• a chain with one end connected to the drive wheel and the other end connected to the sprocket;
• wherein one end of the first drive shaft is connected to the drive wheel, and the other end of the first drive shaft penetrates the housing of the drive from one end to the other end of the housing of the drive;
• part of the first drive shaft inside the housing of the drive is cooperated with a gear set in the drive;
• a free end surface of the first drive shaft is provided with a hexagonal connecting hole that is able to connect to a handle or an electric hand tool;
• and the drive is a hand chain type, hand crank type or motor-driven type.