Hoists made as an upgrade version of the fixed pulley, symmetrically arranged two spur gears rotating structure, fully inherited the advantages of fixed pulley, check the brakes while using reverse gearbox and chain pulley combination of simple, durable and efficient. Hoists made using one-way ratchet friction disc brakes, the braking load on their own, under the action of the spring pawl engages with the ratchet, the safety brake. Brake pressure into integrally rotates together will rotate sprocket tooth axis, minor axis and the spline hole tooth gear. Thus, the device is splined sprocket holes on the lifting gear driven lifting chains, heavy lifting so smoothly. Through hands pull chains, bracelets wheel rotation, the friction plate ratchet, 1 t / 2 t MARK chain hoists chain hoists the U.S. net imports, pregnant pigeon Baoding Hoisting Machinery Manufacturing Co., Ltd. as the sole designated agent MARK now has a sound quality management system, high-quality personnel, advanced technology and production equipment, complete testing means, and the widespread adoption of computer technology, the development of advanced products, pregnant pigeon lifting crane has been committed to research and development design, manufacture, sales and service, has now become the largest crane manufacturing enterprises. Current products include: electric hoist, electric chain hoist, lever hoist, chain hoist, claw jack, import chain hoist, mini electric hoist, electric winch, permanent lifting