What are the common crane hand signals?
What are the common crane hand signals?
There are three common boom signals: Raise boom: Extend an arm outward and point the thumb upward with a closed fist. Lower boom: Extend an arm outward and point the thumb downward with a closed fist. Swing boom: Extend an arm outward, pointing with an index finger in the direction the boom should swing.
What does dog everything mean for cranes?
Dog Everything: Clasp hands in front of the body. Means PAUSE. This signal can be used on potentially risky occasions such as when it has started raining, when the load doesn’t fit the space for which it was planned, or when a bystander gets too close to the action.
What is the hand signal for stop OSHA?
Emergency stop – A signal person will communicate an emergency stop by extending both arms horizontal of the body with palms faced down, from this position they will swing their arms back and forth.
How do tower cranes signal?
Arm extended, point in direction of swing of boom. pointing up, move hand in small horizontal circles. Both fists in front of body, with thumbs pointing outward. With arm extended down, move forefinger; pointing down, move hand in circles.
What is boom in rigging?
In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail.
What is a whip line on a crane?
Another term for “Hoist Rope”. In lifting crane service it refers to the main. hoist. The secondary hoist is referred to as a “Whip Line”.
Who can give an emergency stop signal?
Anyone who becomes aware of a safety problem must alert the operator or signal person by giving the stop or emergency stop signal.
What is whip line for Crane?
hoist. The secondary hoist is referred to as a “Whip Line”. See Rated Load Indicator. A device which aids the operator by automatically sensing the overturning moment on the crane, i.e. load X radius.
What is crane mast?
It is a metal lattice structure with a normally square section, whose main mission is to provide the tower crane with sufficient height. In the upper part of the mast is the rotation zone that gives the crane a horizontal movement of 360º.
What is telescopic crane?
Telescopic Crane A telescopic crane offers a boom that has a number of tubes that are fitted inside each other. Then hydraulic mechanisms extend or retract the tubes to length or shorten the boom.
