Coupling pin

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a pin or bolt used in coupling or joining together railroad cars, etc.

See also: Coupling

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Then he ran out upon the platform just as the engine whistled twice in the final warning that precedes the first rumbling jerk of coupling pins. The others were on board, leaning out from the platform of a Pullman, crying to him to hurry.
People often forget to latch the coupling pin after hooking the trailer to the truck.
Key statement: Provided is a core (10A), in which split pieces (10P) adjacent to each other in a circumferential direction are coupled by a coupling pin (11), an axial direction of which is disposed in a width direction of the split pieces (10P), at a radial inner circumferential side thereof, and split surfaces (10a, 10b) formed by both of the split pieces (10P, 10P) include a first load receiving surface (10c) and a second load receiving surface (lOd) having a predetermined angle with respect to a radial direction at a radial outer circumferential side from the coupling pin (11).
Attachments connect with a quick disconnect coupling with a universal coupling pin. Offered in two models, the hoists feature load capacities of 275 or 550 pounds and lift heights of 9 and 14 feet respectively.
from out of nowhere, a white ticket agent with a coupling pin in his hand suddenly shoved his way through the crowd.