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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   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 ...

3. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   The trailer tongue (North America) or coupling (outside North America) slips over a trailer hitch ball attached to a receiver hitch mount or integral with the hitch. A larger, heavy-duty gooseneck ball size: 3 in (76.2 mm) is typically used for towing greater than 10,000 pounds (4.5 t), and this towing capacity falls outside of the scope of SAE ...

4. Ringfeder - Wikipedia

   en.wikipedia.org/wiki/Ringfeder

   This could be on the rear of a ballast tractor, rigid truck, prime mover or trailer. This mount also includes air, electrical and, if necessary, hydraulic fittings. Firstly, the vehicle is reversed up to the drawbar of the trailer/dolly, stopping short of hitting. The height of the drawbar is checked, and adjusted accordingly.

5. Dolly (trailer) - Wikipedia

   en.wikipedia.org/wiki/Dolly_(trailer)

   An A-dolly has a single drawbar with a centred coupling. A C-dolly has two separate couplings side-by-side. Low loader dolly, equipped with a gooseneck type drawbar that attaches to the fifth wheel coupling on the rear of a prime mover to distribute the mass on the fifth wheel on the dolly between the prime mover and the wheels of the dolly ...

6. Westfalia-Werke - Wikipedia

   en.wikipedia.org/wiki/Westfalia-Werke

   Before 1932, trailers used only jaw or hook couplings with an eyelet for trailer towing. In 1932, Franz Knöbel developed the trailer hitch with a ball head and socket joint. Franz Knöbel patented the ball head-socket joint trailer hitch invention on March 14, 1934. Westfalia hold a number of towing patents. [5] [3] [6]

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