FAQ >> Rotary and Rectilinear Cranes

Rotary and Rectilinear Cranes

Cranes are divided into two classes, as to their motions, viz. Rotary and Rectilinear. and into four groups, as to their source of motive power, viz.:

  • Hand. - When operated by manual power.
  • Power. - When driven by power derived from line shafting.
  • Steam, Eledric, Hydraulic. or Pneumatic. - When driven by an engine or motor attached to the crane, and orated by steam, electricity, water, or air transmitted to the crane from a xed source of supply.
  • Locomotive. - When the crane is provided with its own boiler or other generator of power, and is self-propelling; usually being capable of both rotary and rectilinear motions.
Rotary and Rectilinear Cranes are thus subdivided.

Rotary Cranes

1. Swing cranes. - Having rotation, but no trolley motion. 2. Jib cranes. - Having rotation, and a trolley traveling on the jib. 3. Column cranes. - Identical with the jib-cranes, but rotating around a fixed column (which usually supports a floor above). 4. Pillar cranes. - Having rotation only; the pillar or column being supported entirely from the foundation. 5. Pillar jib cranes. - Identical with the last, except in having a jib and trolley motion. 6. Derrick cranes. - Identical with jib-cranes, except that the head of the mast is held in position by guy-rods, instead of by attachment to a roof or ceiling. 7. Walking cranes. - Consisting of a pillar or jib-crane mounted on wheels and arranged to travel longitudinally upon one or more rails. 8. Locomotive cranes. - Consisting of a pillar-crane mount,edi on a truck, and provided with a steam-engine capable of propelling and rotat- ing the crane, and of hoisting and lowering the load.

Rectilinear Cranes

9. Bridge cranes. - Having a fixed bridge spanning an opening, and a trolley moving across the bridge. 10. Tram cranes. -Consisting of a truck, or short bridge, traveling viinni1v nn overhead rails. and without trolley motion. 11. Traveling cranes. - Consistsing of bridge moving longitudinally on overhead tracks, and a trolly moving transversely on the bridge. 12. Gantries. - Consisting of an overhead bridge, carried at each end by a trestle traveling on longitudinal tracks on the ground, and having a trolley moving transversely on the bridge. 13. Rotary bridge cranes. - Combining rotary and rectilinear movements and consisting of a bridge pivoted at one end to a central pier or post, and supported at the other end on a circular track: provided with a trolley moving transversely on the bridge.

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