Design of Electric Overhead Cranes Crabs Gearing Brake Mechanism
Design of Electric Overhead Cranes Crabs Gearing Brake Mechanism
R B Brown
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92 75 3. 35 2. 08 1. 45 4. 35 3. 08 2. 45 90 2. 71 1. 66 1. 14 3. 71 2. 66 2. 14 105 2. 26 1. 37 0. 93 3. 26 2. 37 1. 93 120 1. 92 1. 14 0. 77 2. 92 2. 14 1. 77 135 1. 66 0. 98 0. 64 2. 66 1. 98 1. 64 150 1. 45 0. 84 0. 54 2. 45 1. 84 1. 54 165 1. 29 0. 73 0. 47 2. 29 1. 73 1. 47 180 1. 14 0. 64 0. 40 2. 14 1. 64 1. 40 195 1. 03 0. 56 0. 35 2. 03 1. 56 1. 35 210 0. 93 0. 50 0. 30 1. 93 1. 50 1. 30 240 0. 76 0. 40 0. 23 1. 76 1. 40 1. 23 270 0. 64 0. 32 0. 18 1. 64 1. 32 1. 18 300 0. 54 0. 26 0.... 14 1. 54 1. 26 1. 14 For example, take the preceding case; then 22 T 2. 718 X 0. 3 X 2. 99=. 6 T, P=zT T 1 ;butT = 2. 99 T, . Therefore P = 2. 99 T 1 T 1 = 1. 99 T lf or T = 210 Since P = 210 pounds, 2\ = = 105 pounds. 1. 99 And T = P + T! = 210 + 105- = 315 pounds. 1. 9' BRAKES 29 The short lever should be given about half an inch travel, to allow the strap to lift as clear as possible of the pulley, therefore, if the magnet has a stroke of two inches, the ratio of leverage will be 4 to 1, and the pull required 105 -r- 4 = 26 pounds.
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