General Ropewor

k & Rigging

BLOCKS

EYECROWN

SWALLOW

SHEAVE

TAIL or ARSEBECKET

CHEEK

TALLY PLATE

SNATCH BLOCKA block with a gate held by a spring toggle

Useful when a block needs to be clipped to a fixed line, e.g. RAS

Never to be used when a fixed block can be used - danger of failure

CLUMP BLOCK

•Can be made of wood or metal

•Has an exceptionally large swallow

•It will take rope one sixth of it’s size

•metal clump blocks are designed to take chain

BLOCK CONSTRUCTION - METAL

• Built up of steel plates & fittings

• Shells have binding which supplies strength

• cheeks of light plating• Some metal blocks have

their shells are cast in one piece

• Metal blocks vary considerably in quality and finish for the job they perform

BLOCK CONSTRUCTION – WOOD (Internal Bound)

BLOCK CONSTRUCTION – SRBF –Synthetic Resin Bonded Fibre

Metal Binding

Compressed resin and fibre sheaves and protective shell

Tally plates with usage details

Stamped with test dates

WHAT IS A TACKLE?

A Tackle pronounced “Taycle” is a purchase consisting of a rope rove through two or more blocks.

The effect of the ‘pull’ is increased depending on how many sheaves and the way the rope is ‘rove’ through them.

SINGLE WHIP

• A fall rove through a single standing block

• No mechanical advantage gained

• Used for hoisting light loads• Used when speed of hoisting

is required

DOUBLE WHIP

• Is used for hoisting• Consists of two single

blocks• Standing part made fast

to or near to the upper block

• It cannot be rove to advantage

LUFF

• A purchase of 24mm or greater in size

• Consists of a double and a single block

• The standing part of the fall is attached to the single block