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The first Prusik knot is attached to the "traveling pulley," allowing it to pull on the load. The second Prusik knot is used to hold the position of the rope and is referred to as a 'progress capture device' or ratchet. Because the tension on the line stores energy and could present a dangerous flying hazard if the rope were to break.
Examples of rope and pulley systems illustrating mechanical advantage. Consider lifting a weight with rope and pulleys. A rope looped through a pulley attached to a fixed spot, e.g. a barn roof rafter, and attached to the weight is called a single pulley. It has a mechanical advantage (MA) = 1 (assuming frictionless bearings in the pulley ...
A messenger line or just messenger is relatively light cordage used to pull a heavier cable across a gap or through a tube or duct. [1] [2] The term is also used for a line used to pull or lower a package along a downline or jackstay. [3] A heaving line is a rope with a weighted end which can be thrown relatively easily across a gap. If it is ...
Push-to-pull, push-to-connect, push-in, push-fit, or instant fittings are a type of easily removed compression fitting or quick connect fitting that allows an air (or water) line to be attached, nominally without the use of tools (a tool is still usually required for cutting tubing to length and removal).
An assembly of blocks with a rope threaded through the pulleys is called tackle. The process of threading ropes or cables through blocks is called "reeving", and a threaded block and tackle is said to have been "rove". [7] A block and tackle system amplifies the tension force in the rope to lift heavy loads.
The compressed air rises to the top of the separation chamber (wind box). The separation chamber has a compressed-air takeoff pipe, and the compressed air can be used as a power source. The energy of the falling water creates a partial vacuum inside the pipe that is compensated by the air from the outside atmosphere provided through inlet.
Each individual tool has its own specific requirements which determine their compatibility with air compressor systems. Flow or airflow, related to air consumption in pneumatic tools, represents the quantity of compressed air that passes through a section over a unit of time. It is represented in l/min, m3, at the equivalent value in free air ...
At the other extreme, when r is zero, the system becomes a simple gun tackle with a mechanical advantage of 2. Comparison of a differential pulley (left) and a differential windlass or Chinese windlass (right). The rope of the windlass is depicted as spirals for clarity, but is more likely helices with axes perpendicular to the image.
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