Chain driven bridge cranes are operated by pulling the hand chain that drives the geared wheels in one direction or another to move the bridge crane. While this gearing makes it easier to move loads than a push/pull system it also makes the operation relatively slow. This makes positioning a load in a precise location much easier.
In general underhung manual overhead bridge cranes are less expensive than top running cranes of the same capacity, yet they are durable and easy to operate.
Manual bridges work well with manual chain hoists, air hoists, electric hoists, and air balancers. Each crane can be equipped with an electrical festoon wire or an air hose to provide power to your desired lifting apparatus.