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A swing cheek block is a special kind of block which can be opened to engage with a bight, without the necessity to thread the rope through the block or remove the load from the end of the rope. The snatch block is also the load lifting pulley in certain arrangements, such as during use in a recovery operation. [12]
Marketed as "Weston Differential Pulley Blocks with Patent Chain Guides", the pulley had good sales, namely, 3000 sets in 9 months. It was displayed in 5 sizes—from 10 long hundredweight (510 kg) to 3 long tons (3,000 kg)—at the 1862 International Exhibition in London and received a medal for "original application, practical utility and ...
The ideal mechanical advantage of the block and tackle is equal to the number of sections of the rope that support the moving block. In the diagram on the right, the ideal mechanical advantage of each of the block and tackle assemblies [7] shown is as follows: Gun tackle: 2; Luff tackle: 3; Double tackle: 4; Gyn tackle: 5; Threefold purchase: 6
The winch consists of a gas-powered engine, spool, rope, frame, and sometimes a simple transmission. The person being towed walks (or swims) away from the winch, while extending the rope. When the winch is engaged, it pulls the boarder in at a speed ranging from 25 to 40 kilometres per hour (16 to 25 mph).
The transfer case had a 2.50:1 low range, engaged the front axle, and had a power take-off to operate the winch(es). [ 3 ] [ 1 ] [ 7 ] [ 8 ] The front axle was an unusual triple reduction type which did not need universal joints on the outer ends and allowed a tighter turning radius.
An M816 wrecker being pulled by another M816. The M816 Medium Wrecker is part of the M809 series of 5-ton 6x6 military trucks.It was made by AM General starting in 1970. It has a revolving hydraulic crane with an extending boom that can extend from 10–18 ft with a maximum lift capacity of 20,000 lb with outriggers and boom jacks to the ground.
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