The safe, productive, ergonomic solution for overhead materials handling operations. #1
- In Safety
- In Productivity
- In Ease of Positioning and Movement
- In Ease of Installation
- In Designs, Capacities, and Spans
- Bridge cranes cover rectangular areas, while jib cranes cover circular areas.
- Bridge cranes can be hung from the ceiling or be floor supported. Jib cranes can be wall or pillar mounted and may require a special foundation.
- An enclosed track work station bridge crane provides consistent ease of operation over the full range of movement.
- Jib cranes move more easily at the very end of the boom and are more difficult to move as the load approaches the pivot point.
- With ceiling-mounted systems, supporting steel does not interfere with the handling operation. Ceiling-mounted systems require a building with an adequate overhead structure to hang the crane).
- Free-standing (floor-supported) systems do not put stress on the building’s overhead structure. Installation is usually more straightforward, and these cranes are also easier to relocate in the future. These systems require a reinforced concrete floor of at least 6 inches.
- Keep capacities to a minimum. Work Station Cranes are designed with an adequate safety factor. If you “over-buy capacity,” the operator will need to move extra bridge dead weight, which would not be a good ergonomic solution.
- Keep bridge lengths to a minimum. The less dead weight an operator has to move, the better. Short bridge lengths are better for higher-cycle production areas. Longer bridges are acceptable for lower-production cycle or maintenance areas.
- Keep bridge heights to a minimum. Keeping the height less than 14 feet is desirable because it makes it easier to control and position the load.
- A work cell should be designed so a task can be performed by 90% of the workers.
- A worker should not exceed 33% of his or her capacity; otherwise, the risk of chronic fatigue increases.
- To help determine if your worker can safely move the required loads, refer to the Ergonomic Study by Shealy and Stibitz ©1993, which is available through ASE Systems
- Enclosed track cranes are easier to move than traditional bridge cranes.
- The design virtually eliminates dirt and dust from the rolling surface, thus reducing wear on the wheels of the trolley and end trucks.
- The smooth running surface means lower rolling resistance.
- The low profile of the steel track allows the system to be installed where headroom is a problem.
- The low track weight reduces the applied forces exerted on the supporting structure.
- R1 = vertical load applied by support hanger (lb.)
- R2 = longitudinal load applied by movement of the crane to each runway (lb.)
- R3 = lateral force applied by movement of the trolley and load to each runway (lb.) L1 = distance between support centers (ft.)
- R1 = 1.4 x P + (W x L1) + (w x L4)
- R2 = ((1.15 x P) + (w x L4)) x .10
- R3 = 1.15 x P x .20
- There are no “dead” coverage areas (areas with no bridge coverage) along the length of the system, so each bridge can travel the length of the system. (See mixed capacity system diagram)
- There are limited “dead” coverage areas between bridges, so bridges can be used side-by-side. (Compare mixed capacity system diagram with bridge buffer system diagram)
- Bridges weigh less, making the system more ergonomically friendly.
- Mixed capacity systems use larger sized runways, so they may cost more than bridge buffer systems or systems that use intermediate stops.
- Bridge buffer systems usually cost less than mixed capacity systems because they typically use smaller sized runways.
- The bridge buffers take up space (typically half the distance of the support centers), which creates a moving “dead” space between bridges. (See bridge buffer system diagram) Note: When using two bridges, the dead space equals half the distance between support centers (L1 from the dimensional charts). When adding a third bridge, the dead space occupied by the additional bridge buffers equals the full distance between support centers.
- Systems with intermediate stops use smaller runways, therefore typically cost less than mixed capacity systems.
- There are fewer potential “dead” spots in the system. (Compare intermediate stops system diagram with bridge buffer system diagram)
- Each bridge on the system can travel only a portion of the length of the system. (See intermediate stops system diagram)
- Systems with intermediate stops may be more difficult to install, as additional ceiling support points must be available to accommodate the additional hangers required to prevent an overload situation.
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