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Diagram 3 shows three rope parts supporting the load W, which means the tension in the rope is W/3. Thus, the mechanical advantage is three-to-one. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle.
Rigging is the equipment such as wire rope, turnbuckles, clevis, jacks used with cranes and other lifting equipment [1] in material handling and structure relocation. Rigging systems commonly include shackles, master links and slings, and lifting bags in underwater lifting.
6-ton 6x6 [10] 1941–1945: 219,882: Bridge, crane, cargo fire, van and others by 5 manufacturers Mack NM 6-ton 6x6: 1940–1944: 8,400+ Prime mover cargo truck Mack NO 7 + 1 ⁄ 2-ton 6x6: 1943–1945: 2,050: Prime mover cargo truck M1 Wrecker 10-ton 6x6 [11] 1941–1945: 5,765: Standard heavy wrecker during WWII Built by Ward LaFrance and ...
A turnbuckle, stretching screw or bottlescrew is a device for adjusting the tension or length of ropes, cables, tie rods, and other tensioning systems. It normally consists of two threaded eye bolts , one screwed into each end of a small metal frame, one with a conventional right-hand thread and the other with a left-hand thread.
A railroad crane generally resembles a conventional fixed-location crane except that the platform the crane sits on is a heavy-duty reinforced flat car. Directly underneath the center of gravity for the crane is a pivot point that allows the crane to swivel around 360°; in this way the crane can locate its boom over the worksite no matter what ...
In 1959 crane expert R.H.Neal, hydraulics specialist F.Taylor, and design director Bob Lester, integrated all three and modernized cranes. The Coles Hydra Speedcrane appeared in 1962, further modified with the 10-ton fully telescopic hydraulic boom in 1966, followed in 1968 by the 30-ton "Husky" military versions with four-wheel drive. In 1972 ...
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