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A hand truck. A hand truck, also known as a hand trolley, dolly, stack truck, trundler, box cart, sack barrow, cart, sack truck, two wheeler, or bag barrow, is an L-shaped box-moving handcart with handles at one end, wheels at the base, with a small ledge to set objects on, flat against the floor when the hand-truck is upright. [1]
Early patents described different mechanisms for glider chairs, such as rails [1] and four-bar linkages supported by springs. [2] Patents using a swinging seat suspended from a four-bar linkage as well as the name glider first appeared in 1939, and this is now the general configuration used by most glider chairs.
The most extreme example of this is where the wheel stops rotating altogether (wheel slide) while the train is still moving and can result in a “wheel flat” caused by the softer steel wheel being worn away by the harder steel rail. However, the wheelset does not need to lock up completely in order for damage to be caused.
Sliders are also combined with progress bars in the playback of streaming media over a network connection (e.g., YouTube videos) in order to show the content buffering position versus the playback position. This is done by superimposing a colored shaded area (progress bar) on top of the slider, indicating whether the user can "jump" forward or not.
Each driving wheel supports its share of the locomotive's weight via leaf springs that connect the axle's journal box / axle box (40) to the frame. [3]: 28 Driving wheels Drivers (US+) Coupled wheels (UK+) Wheels coupled to the main/side rods, through which the power developed in the cylinders (24) is transformed into tractive power at the rails.
In mathematics, the moving sofa problem or sofa problem is a two-dimensional idealization of real-life furniture-moving problems and asks for the rigid two-dimensional shape of the largest area that can be maneuvered through an L-shaped planar region with legs of unit width. [1] The area thus obtained is referred to as the sofa constant.
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