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The coupling consists of a kingpin, a 2-or-3 + 1 ⁄ 2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with ...
The Mullins Trailer was developed by The (Mullins Metal Stamping Company 1894–1974), located in Salem, Ohio. "The Mullins Manufacturing Company produced this trailer from 1936 to 1938. It was the only all-steel two-wheel auto trailer on the market at the time. Selling for $119.50, it was an immediate hit with the public." [1]
The trailer hitch ball attaches to a ball mount; with a diameter typically 1 ⁄ 16 inch (1.6 mm) larger than the ball bolt/shank diameter. [2] The ball mount must match the SAE hitch class. [3] The ballmount for a receiver-type hitch is a square bar that fits into a receiver attached to the vehicle.
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
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A swivel gun (or simply swivel) [1] is a small cannon mounted on a swiveling stand or fork which allows a very wide arc of movement. Another type of firearm referred to as a swivel gun was an early flintlock combination gun with two barrels that rotated along their axes to allow the shooter to switch between either the rifled or the smoothbore ...
[2] Z-bar and roll-inducing springs: Mercedes-Benz introduced, to help their low-pivot swing-axle, a coil spring mounted transversely above the differential, which would transfer load from one side to the other, so as to force down one wheel when the other side went up. This coil spring increases the load bearing capacity of the rear suspension ...