Featuring terrific speed control, push/pull cranes accelerate and decelerate at the speed of the operator. This can be more efficient than handling the same loads with powered (motorized) cranes with set speed points. With a standard I-beam construction, underhung push/pull manual cranes are the most economical bridge cranes available; however, easier to push/pull patented rail and enclosed rail cranes are available where high and repetitive use is called for.
- Inexpensively manipulates light loads at spans up to 45 ft.
- Best used at operational heights of 15 ft. and below
- Due to the applied force needed to move the bridge crane, some conditions may not be conducive to this type of system, including slick floors and areas with many floor obstructions
- Exceptional speed control
Hand Chain Drive
Chain-driven bridge cranes are operated by pulling the hand chain that drives the geared wheels along the railway. While this gearing makes it easier to move loads than a push/pull system, it also makes the operation relatively slow, allowing for easier, more precise load positioning.
In general, underhung manual overhead bridge cranes are less expensive than top running cranes of the same capacity, yet just as durable and easy to operate.
Manual bridges work well with manual chain hoists, air hoists, electric hoists, and air balancers, with an electrical festoon wire or air hose to provide power to the lifting apparatus.
- Inexpensively moves loads up to 15 tons
- Enables precision spotting
- Use for pumping stations, assembly applications, and maintenance bays