3 Terms, Definitions and Abbreviations
3.1 Terms and Definitions
For the purposes of this document, the following definitions apply.
3.1.1
A-frame
gantry
mast
A structural frame extending above the upper structure to which the boom support ropes are reeved.
NOTE 1 See Figure 1, Item 17.
NOTE 2 The head of the mast is usually supported and raised or lowered by the boom hoist ropes.
3.1.2
auxiliary hoist
whip line
A secondary rope system, usually of lighter load capacity than provided by the main rope system. Also known as
auxiliary.
NOTE See Figure 1, Item 26 and Item 27.
3.1.3
auxiliary tip
An extension attached to the boom point to provide added boom length for the auxiliary hoist.
NOTE See Figure 1, Item 14.
3.1.4
axial load
A load applied in line with an object.
3.1.5
axis of rotation
The vertical axis around which the crane upper structure rotates.
3.1.6
base (mounting)
pedestal (base)
The supporting substructure on which the revolving upper structure is mounted.
NOTE See Figure 1, Item 23.
3.1.7
bearing raceway
The surface of the bearing rings which contact the rolling element (balls or rollers) of the swing-bearing assembly.
3.1.8
bearing ring
The rotating and stationary rings that house the rolling elements (balls or rollers) of the swing-bearing assembly.
3.1.9
bearing stress
Stress caused by contact between two members (e.g. pin in a hole).