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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]
It is designed to couple to the concerned automobile's powered wheel, i.e. the front wheel of a Front-wheel drive automobile, or the rear wheel of a rear-wheel drive automobile, by locking the powered wheels onto the tow dolly's tray. The tow dolly is tow hitch connected to a tractor or truck. Tow dollies are legal in all 50 US states and Canada.
The tow-ball is popular for lighter loads, readily allowing swivelling and articulation of a trailer. A tow pin and jaw with a trailer loop are often used for large or agricultural vehicles where slack in the pivot pin allows the same movements. A pintle and lunette is a very heavy duty hitching combination used in construction and the military.
A posser, also known as a dolly, used for laundering; A variety of wheeled tools, including: Dolly (trailer), for towing behind a vehicle; Boat dolly or launching dolly, a device for launching small boats into the water; Camera dolly, platform that enables a movie or video camera to move during shots; Hand truck, sometimes called a dolly
The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. 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 ...
Medium-duty tow trucks have a boom capacity of 15 to 20 short tons (14–18 metric tons). Heavy-duty tow trucks, based on chassis used by semi-trucks, with multiple axles and the ability to tow fully-loaded semi-truck and trailer combinations, have a boom capacity from 25 to 50 short tons (23–45 metric tons).
The most common drawbar configuration for heavy vehicles is an A-frame drawbar at the front of a full trailer that connects to a tow coupling on a hauling vehicle [1] On heavy vehicles, the drawbar is coupled using a drawbar eye , typically of 40 mm or 50 mm diameter, connected to a bolt and pin coupling.
A dolly in operation needs frequent detachment and re-attachment from the tug and other dollies. It is not access controlled (it does not need a car key be used, like an automobile). It is not always supervised by the same driver (any tractor can come to pick up any dolly and tug them away, sometimes erroneously).