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2. Wheel chock - Wikipedia

   en.wikipedia.org/wiki/Wheel_chock

   Wheel chocks (or chocks) are wedges of sturdy material placed closely against a vehicle's wheels to prevent accidental movement. Chocks are placed for safety in addition to setting the brakes. The bottom surface is sometimes coated in rubber to enhance grip with the ground. For ease of removal, a rope may be tied to the chock or a set of two ...

3. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel. Fifth wheels were originally not a complete circle and were hand forged.

4. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   A tow hitch (or tow bar or trailer hitch in North America [1]) is a device attached to the chassis of a vehicle for towing, or a towbar to an aircraft nose gear. It can take the form of a tow ball to allow swiveling and articulation of a trailer , or a tow pin, or a tow hook with a trailer loop, often used for large or agricultural vehicles ...

5. Overrun brake - Wikipedia

   en.wikipedia.org/wiki/Overrun_brake

   Therefore, the inertia of the trailer provides the force to apply the brakes. Some systems have a ball hitch that is normally straight, but when the lead vehicle starts braking, the trailer pushes forward on the ball hitch, pitching it up which then activates a variable hydraulic brake system. Upon activating the trailer slows down pulling back ...

6. Trucker's hitch - Wikipedia

   en.wikipedia.org/wiki/Trucker's_hitch

   The trucker's hitch is a compound knot commonly used for securing loads on trucks [7] or trailers. The general arrangement, using loops and turns in the rope itself to form a crude block and tackle , has long been used to tension lines and is known by multiple names.

7. Chuck (engineering) - Wikipedia

   en.wikipedia.org/wiki/Chuck_(engineering)

   Self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece.