What is an anti-two-block device?

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 ATB switch connects to the crane’s LMAP system through a wire or battery-powered transmitter.

What is the anti-two-block OSHA?

A positive acting anti-two-block device provides for an automatic cessation of the lifting action when the headache ball or block approached the end of the boom or jib. In responding to your second request, the standard does apply to all cranes, including friction rigs and hydraulic cranes.

What is 2 blocking a crane?

Two-blocking occurs when the operator extends the boom on a crane without letting out sufficient slack in the cable. As a result, the stabilizing weight, called the headache ball, will be popped off by the extending boom. Many more modern cranes have anti two-blocking devices that prevent this accident.

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What is a blocking device?

What is a block device. A block device is a device you can read blocks from. For example hard disks, cdrom drives and floppies are block devices, but not the keyboard. You can receive data from the keyboard and regard them as blocks, but you cannot seek on the keyboard.

What is two blocking?

Two-blocking is the term referring to the event when the hoist raises the bottom block until the bottom block applies force to the hoist unit itself, or the support structure for the hoist.You cannot “break” the motor leads from a variable frequency drive to a motor in operation without damaging the drive.

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What is anti blocking?

Coated surfaces or layers, especially tacky or those recently coated, have a tendency to stick together. When this happens, they are often ruined. Preventing this from happening is called anti-blocking.