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Crane Glossary
a b c d e f g h i j k l m n o p q r s t u v w x y z
SHALL:
This work indicates that the requirement is based upon sound engineering judgement at the time of publication of this specification.
SHEAVE:
A grooved wheel or pulley used with a rope or chain to change direction and point of application of a pulling force.
SHOULD:
This work indicates that the requirement is a recommendation, the advisability of which depends on the facts in each situation.
SIDE PULL:
The angle by which the load block is being operated outside of the vertical lifting plane (not recommended).
SKELETON CAB:
Same as dummy cab.
SKEWING FORCES:
Lateral forces on the bridge truck wheels caused by the bridge girders not running perpendicular to the runways. Some normal skewing occurs in all bridges.
SPAN:
The horizontal distance center-to-center of runway rails.
STATIC CONTROL:
A method of switching electrical circuits without the use of contacts.
STEPLESS CONTROL:
A type of control system with infinite speed control between minimum speed and full force.
STEPPED CONTROL:
A type of control system with fixed speed points.
STRENGTH, AVERAGE ULTIMATE:
The average tensile force per unit of cross sectional area required to rupture the material as determined by test.
SWEEP:
Maximum lateral deviation from straightness of a structural member, measured at right angles to the Y-Y axis.
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