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The rack ends serve to hold and space the rails, and act as points to secure the cords that raise and lower the unit. Cords go from the metal tether points to pulleys mounted on the ceiling, and then to a cleat hook mounted on the wall. The defining feature of this airer is its pulley system.
A stack machine—also called a stack or rack—has a set of rectangular plates that are pierced by a vertical bar which has holes drilled in it to accept a pin. [1] Each of the plates has a channel on its underside (or a hole through the middle, as visible in the picture) that aligns with one of the holes.
A power rack (also known as a power cage, squat cage or squat rack) is a piece of weight training equipment that functions as a mechanical spotter for free weight barbell exercises without the movement restrictions imposed by equipment such as the Smith machine. Its general design is four upright posts with two adjustable horizontal bar catches ...
To fully outfit a 1,300-2,800-square-foot gym for strength-training, you need dumbbells, kettlebells, barbells, medicine balls, three to four racks, and flooring that can withstand heavy weights.
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 ...
Through a cable and pulley system, the burden is transferred to the machine's user. By placing a pin in the stack that causes the cable to pull on each plate above the pin, the weight is selected. We refer to this configuration as a "selectorized" weight machine.