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Rigging 6

Lifting Devices

QuestionAnswer
1. A ___ is an assembly of one or more pulleys in a frame block
2. ___ is the combination of ropes and accessories arranged with blocks to gain mehanical advantage for lifting tackle
3. ___ is the passing of a rope through an opening or around a pulley reeving
4. As it pertains to block and tackle, what is a part rope length between hook/block or between two blocks
5. ___ reeving has one line between the load and the single block 1 part
6. A ___ is the part of the rope to which force is applied to hold or move a load lead line
7. Three-part reeving provides a mechanical advantage of ___ . Each part supports ___ of the load, so the force on the lead line is ___ of the load weight 3:1, 1/3, 33%
8. Block and tackle is limited to three-part reeving. True / False False
9. Define static force as it is applied to lifting a load force great enough to hold load stationary but not lift it
10. how is the amount of static force required to hold a load in place calculated Fs = W total/ n
11. What is the force required to hold a 300 lb. load using a two-part reeving system? The rope, block, and hook components total 20 lbs.
12 As a ___ exceeds the minimum static force it overcomes friction in the pulleys and the load begins to rise lead line force
13. Each pulley adds friction to the system, which adds a practical limitation to the temptation of increasing the number of pulleys to a tackle arrangement for greater mechanical advantage. True / False True
14. Less additional force is required to overcome the friction of plain bearing pulleys than rolling bearing pulleys. True/False False
15. What is the minimum force required to lift a 6,000 lb load using an eight-part reeving system equipped with ball bearing pulley? The Pulley Friction Factor is .17. FL = W total * Ffr , 1020
16. What is the static force required to hold the 6,000 lb load in question 15 6000 / 8 = 750
17. What is the true mechanical advantage delivered by the block and tackle arrangement in question 15 5.88 to 1
18. As more pulleys reduce the force required to lift a load, the distance the lead line must be pulled decreases. True/False False
19. block and tackle travel speed is affected in the same manner as travel distance. True/False True
20. In order to lift a load safely, the safe working load limit of a block must be considered. A block loading factor is based on what factor angle between lines
21. A ___ is a mechanical device used to provide the lifting force on lead lines hoist
22. For a hoist, the mechanical advantage in torque is provided at the expense of ___ speed
23. Unlike the worm gear hoist, bevel gear hoists normally do not require braking or locking mechanism to prevent reverse rotation. True or False False
24. What must be taken into consideration when attaching a hoist to a supporting structure pg 61, attachment point and structure must be strong enough for load
25. All power-operated hoists are equipped with an upper ___, as a safety mechanism, to de-energize the hoist when the hoist hook reachs the upper limit of travel preventing damage to the hoist. limit switch
26. A ___ is a power-operated hoist that includes an electric motor to provide the input torque to the gear drive electric hoist
27. What type of hoist has an advantage when used for applications in environments where electric arcing poses an explosion hazard pneumatic hoists
28. The pattern in which rope should be wound onto a drum depends on the rope lay and direction True/False True
29. When winding rope onto a drum,, a ___ is a rope wrap winding on top of the preceding wrap crossover
30. A ___ is a collection of voluntary rules developed through consensus and related to a particular trade, industry, or environment standard
31. List six organizations that develop standards and regulations pertinent to hoist safety OSHA, ANSI, ISO, CMAA, ASME, NFPA
32. ___ is the continued travel of a hoist hook caused by insufficient motor braking hook drift
Created by: JoshHampton
 

 



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