Definitions Flashcards
The wire rope live line that is reeved over the auxiliary boom head or jib (extension, fly, etc.)
Auxiliary line (wire rope)
These separate the whip line (auxiliary line) and the main hoist load line. Usually attached to the end of the main boom to separate load lines and used in the place of a jib.
Auxiliary boom head (Rooster sheave, auxiliary boom point sheave, hammer head, etc.)
Preferably hard wood or like material used to aid in elevation changes of an outrigger float, placed on top of cribbing.
Blocking
Normally a running wire rope used as the boom hoist line on a lattice boom crane, run from the rear of the boom mast (gantry or strut) to a drum controlled by the operator from inside the crane cab. Many consist of many parts of line in a reeving system to move the boom up or down.
Boom backstay
Almost always a standing pendant line or rod used to support the main boom from the boom mast (gantry or strut) to the boom tip.
Boom forestay
A lever used to aid in the up and down movement of the main boom, normally mounted near the boom heel pin. The boom forestay is attached to the front of the mast and the boom backstay is attached to the rear of the mast.
Boom mast
A hard wood or other strong material used as a tool to displace weight and provide support to a crane using outriggers.
Cribbing
A lifting attachment with a hook similar to a standard lift hook, only supported by one part of wire rope with an additional purpose of aiding the wire rope in unspooling evenly, preventing nesting on the wire rope drum.
Headache ball
A jib, that the angle of offset can be controlled by the operator from inside the cab via jib reeving.
Luffing jib
An extension which adds height to a main boom. Can be either a mechanically mounted or luffing. When not in use on many cranes, it is stowed on the side of the main boom. It can be fixed length extension or a telescopic extension.
Jib (extension, fly)
Normally a running wire rope used as the jib hoist line on mobile boom crane (lattice or telescopic), run from the rear of the jib mast (gantry or strut) to a drum controlled by the operator from inside the cab. May consist of many parts of line in a reeving system to change the angle of offset to the jib.
Jib backstay
Almost always a standing/pendant line or rod used to support the jib from the jib mast (gantry or strut) to the jib tip. This line should always be under tension.
Jib forestay
A lever used to aid in the up and down movement of the luffing jib, normally mounted near the boom tip sheave pin area. The jib forestay is attached to the front of the mast and the jib backstay is attached to the rear of the mast. Occasionally, a fixed jib could be mounted using a jib reeving system where both the forestay and backstay are standing/pendant lines.
Jib mast (gantry or strut)
Also referred to as the main boom hoist line, is the reeved live line coming off the main boom sheaves and used to hoist loads with the main boom.
Main line
Extendable arms extending out of the carrier, with stabilizers attached to floats, used to extend down to the cribbing/blocking to relieve the crane’s weight off the tires. Also used to change leverage and stability, and to move the tipping fulcrum. Consist of beam, jacks, and pads/floats.
Outriggers
Odd lines terminate at the hook and even numbered lines terminate at the boom tip.
Reeving
The point in which a crane will tip on either outriggers or crawlers, based on the location of the load, which quadrant of operation the pad is in and outrigger, stabilizer, or crawler position.
Tipping fulcrum
