What is an anti 2 block?

Anti two-block or ATB systems help prevent the ball block from contacting the boom tip. This is called two-blocking and can cause injury or death as well as damage to the crane, load line and ball or block. The Altec ATB system consists of a load line weight suspended from a chain, connected to a boom tip ATB switch.

What is anti two block system crane?

An anti-two-blocking system is a technologically advanced electrical device with a built-in sensor that helps the crane operator prevent two-blocking incidents. Two of the most popular variations of this safety device are wireless ATB systems and hardwired ATB systems.

What is an a2b switch?

Over hoist limit switch is a crane safety device mounted on the hoist/crane head. The sensor activates when the hook block approaches close to the head pulley block avoiding a collision leading to an accident.

What is the 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”. Load Moment.

What does the term two blocked mean?

From nautical terminology for a ship’s rigging or crane rigging in which two blocks are locked together, stopping the line.

What is a a2b system?

A2B is a high bandwidth, bidirectional, digital audio bus. A2B is capable of transporting I2S/TDM/PDM data and I2C control information, along with clock and power, using a single, 2-wire UTP cable over distances up to 15 m between nodes and 40 m over the entire daisy chain.

Why is it called a headache ball on crane?

To combat the phenomenon, crane hooks for single-part load lines are assembled with these weighted balls. The official term for the assembly is an overhaul hook ball, but enough ironworkers and other tradesmen have had unpleasant encounters that the assembly has earned another name — a headache ball.

What is a headache ball on a crane?

Headache Balls, also known as overhaul hook balls, are very important devices used in a single line hoist wire rope with the purpose to add weight and help the line to drop down after coming up the crane boom and going over the sheave.

Why is it called two blocking on the crane?

Etymology. From nautical terminology for a ship’s rigging or crane rigging in which two blocks are locked together, stopping the line.

What is an overhaul ball?

Heavy steel ball used to provide ballast on the hook end of a crane hoist rope. Overhaul balls supply the downhaul weight necessary to counter bearing friction and winch-to-boom-tip line weight. It can also be used in lieu of a winch.