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Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.
Consider the set of pulleys that form the moving block and the parts of the rope that support this block. If there are p of these parts of the rope supporting the load W, then a force balance on the moving block shows that the tension in each of the parts of the rope must be W/p. This means the input force on the rope is T=W/p.
The blinds were often used instead of window curtains or shutters. In the 1840s, these blinds were held together by flat strips of cloth instead of by cords perhaps to shade the lift holes and like today they came in various colors. [2] In 1966, a new pulley system was invented which afforded great improvement in the control mechanism. [3]
Photo illustration of children who were strangled by window covering cords and an illustration of inner and outer window covering cords on slated window blinds. (NBC News) NBC News
Four wool spinning machines driven by belts from an overhead lineshaft (Leipzig, Germany, circa 1925) The belt drives of the Mueller Mill, model and reality, in motionA line shaft is a power-driven rotating shaft for power transmission that was used extensively from the Industrial Revolution until the early 20th century.
The end disk and hub may be one piece. The locking assembly may also be replaced with a hub and bushing on lower tension pulleys. The shell is also referred to as the rim in some parts of the world. The pulley shaft is typically sized following CEMA B105.1 in the Americas or AS 1403 in Australia.