The overhead free standing crane is also well known as an overhead bridge crane, or a workstation bridge crane. There are three different popular types of overhead bridge cranes. The three types are:
- Single Girder Top Running Bridge Crane – This type is an overhead bridge crane that has one bridge girder that supports the trolley and hoist. The trolley and the hoist ride along the bottom flange of the bridge. The single girder crane is also widely considered top running when the girder of the bridge runs along the top of the runway beams instead of the bottom.
- Double Girder Top Running Bridge Crane – This model is an overhead bridge crane that has two bridge girders that support the trolley and hoist. The trolley and hoist ride on top of the two bridge girders. The double girder bridge crane is considered top running when the bridge girders ride on top of the runway beams.
- Single Girder Under Running Bridge Crane – This variation is a bridge crane in which the girder of the bridge runs along the bottom of the runway beam. In contrast to a top running bridge crane where the bridge girder rides on top of the runway beams. The runway beam for an under running bridge crane is which this type is usually ceiling mounted. The under running bridge cranes also have a weight limit of only 10 tons which is highly advised not to be exceeded.
The other choice for an overhead free standing crane is the workstation bridge crane. This type of crane has two types of choices consisting of:
- Free Standing Workstation Bridge Crane – This choice utilizes an enclosed track design that makes for easy movement and longevity of life. Enclosed track systems are high in strength and low in weight. The low profile enclosed track design allows for the system to be installed where headroom is a problem.
- Ceiling Mount Workstation Bridge Crane – Work Station Bridge Cranes use enclosed track that is cold rolled and has a low profile that offers a low-weight to high-strength ratio. Floating end trucks result in ease of movement and precise load positioning. The bridge travels smoothly down the enclosed track runway. Ceiling mount workstation bridge cranes come with standard hanger assemblies.
Although there are those five standards and most popular types of the overhead free standing crane, there are many other variations and types to choose from when considering purchasing. The few things to consider about them and to be cautious of are similar across all various models of cranes. The factors to be considered consist of weight lifting limit for the hoisting capacity, operating space, worker safety, and ease of worker operability. Always be sure to consider all cautious specifications before purchasing a crane and also be sure to never operate a crane outside of its operating capacity. Meaning never lifts more than the crane has been designed to lift by the manufacturer, and always ensure that the operator knows all safety risks of the crane in operation.
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