See wedge socket.
A tower crane with a counter weighted horizontal boom which supports a traversing crab for hoisting.
An attachment for joining hooks or rings to a chain.
A fibre rope tackle where one block has two sheaves and the other block has three sheaves (double and treble blocks). It is also called ‘light gin tackle’.
A fibre rope construction which uses three strands.
The top block in a purchase, tackle or block at the head of a crane boom or hoist.
A spherical overhauling weight.
HEAVY DUTY WORKING PLATFORM
A scaffold platform with a duty live load capacity of 675kg per bay. This is three times the capacity of a light duty platform.
HEAVY GIN TACKLE
A fibre rope tackle where the upper block has three sheaves and the lower block has three sheaves (two treble blocks).
The spiral put into a rope construction.
Rope damage indicated by one strand sitting up higher than the others in a portion of the rope.
A tie made in a fibre rope to fix it to an anchorage or to a load. Common examples include the clove hitch, rolling hitch, becket (or buntline) hitch and timber hitch.
An appliance used to raise or lower a load with no horizontal movement.
Raising or lowering a load.
A device used in a crane or hoist to stop the winch or warn the operator before the hook block jams into the head block (two-blocking) while the hook is being raised. It is also called an ‘anti-two-block device’.
The lower block on a crane which incorporates a hook for slinging loads.
HYDRAULIC BOOM CRANE
A crane which has a boom which luffs using hydraulic power and usually also telescopes using hydraulic power.