Crane Glossary

abnormal operating conditions braking, mechanical

abnormal operating conditions :  unfavorable, harmful, or detrimental environmental conditions to or for crane operating, in example: corrosive fumes, unfavorable weather exposure,  extremely low or high climate temperatures, dangerous lifting locations, as well as atmospheres that are moist or dust laden.

(the overhead crane) boom : a horizontal member used to permit hoisting as well as lowering the load at a point other than directly under the hoist drum or trolley, it is mounted on the trolley.

(the gantry crane) boom : a trolley runway extension often used to obtain clearance for gantry travel by retracting or raising.

administrative or regulatory authority : when a governmental jurisdiction is not available, the employer or, if a governmental jurisdiction is available, then the governmental agency.

brake : a device that is not a motor, that uses power or friction means to cease or pause motion

braking, hydraulic : by means of displacement of a liquid, this method controls or reduces speed.

braking, counter torque (plugging) : by reversing the motor line voltage polarity or phase sequence to develop torque in the opposite direction of the motor’s rotation, this method controls speed.

brake, holding : used for a hoist, a friction brake that  is applied automatically as well as prevents motion when the brake’s power is off.

brake, mechanical load : an friction brake that is automatic with the purpose of controlling loads in a lowering direction. White requiring torque from the motor to lower a load, this unidirectional device does not put any added load, when lifting a load, on the motor.

braking, dynamic : by making the motor work as a generator, with the energy being dispersed in resistors, this method controls speed.

braking means : a device or method that uses the means of either power or friction to hold or stop motion.

braking, eddy current : by use of an electrical induction load brake, this method reduces or controls speed.

braking, control : by imparting energy in the opposite direction or by removing energy from the moving body, this method controls speed.

appointed : when the employer's representative or the employer explicitly assigns an individual responsibilities. authorized: to have a regulatory authority or a duly constituted administrative authority appoint an individual.

auxiliary hoist : backup unit used for the hoisting of higher speed, as well as lower road rating than the primary hoist in most cases.

braking, emergency : when power is not available, this method is used to slow a drive. As a result of action by the operator, or, in some cases automatically when power to the drive is interrupted, the braking effort is established.

braking, mechanical : a method that uses friction to control or reduce speed.