For example, most, if not all, kingpins used in the fifth wheel coupling are designed to be used when plumb.
Operations, however, necessarily result in degradation of the kingpin over time to a point where attempting to hitch using a degraded kingpin is unsafe. The condition of the kingpin is a significant factor in the safe towing of trailers. Kingpin is, typically, a unitarily constructed article comprised of a lower flange 115 capping a shank 113 which extends from collar 117. Kingpin 111 typically extends from a trailer bearing plate 107, which rests upon fifth wheel assembly, specifically, upon load area 145 of fifth wheel hitch plate 130. Fifth wheel hitch assembly 110 comprises hitch plate 130 with slot 135 opening toward the aft end of fifth wheel assembly 110 for receiving a kingpin 111 from trailer 119. Tractor 100 is affixed with a fifth wheel hitch 103 to rear of tractor frame 105.įifth wheel hitch 103 includes a fifth wheel hitch assembly 110 pivotally mounted on pedestal 155. 1A through 1C depict an exemplary tractor and trailer hitch arrangement employing a fifth wheel hitch. The tool of claim 6, wherein said hexagonal cap is one of one-and-one sixteenth inches and fifteen sixteenth inches.īACKGROUND Description of the Related Artįifth wheel hitches are well known in the field of towing trailers using a truck or tractor.
The tool of claim 5, wherein said at least one recess comprises first and second recesses, each of a different size, for receiving differently sized hexagonal caps.ħ. The tool of claim 4, wherein said plate has a surface and further comprising indicia disposed upon said surface for indicating whether one of a collar diameter and a shank diameter of said kingpin is below a minimum diameter.Ħ. The tool of claim 1, wherein each of said wide and narrow portions of said aperture further comprises first and second widths, said second width being narrower than said first width, and a transitional region interposed therebetween.ĥ. The tool of claim 2, wherein said hexagonal cap is one of one-and-one sixteenth inches and fifteen sixteenth inches.Ĥ.
The tool of claim 1, wherein said at least one recess comprises first and second recesses, each of a different size, for receiving differently sized hexagonal caps.ģ. an orthogonal thickness with respect to said plane, said thickness being substantially constant for most of the tool with respect to the tool length, and relatively greater in the area of said at least one shaped recess.Ģ. a shaped aperture therein for inserting therethrough a kingpin, said shaped aperture having a wide portion and a narrow portion, said wide and narrow portions being substantially rectangular and d. a side opposing said first side, said opposing side having at least one recess shaped and dimensioned to receive said hexagonal cap for transferring the application of torque thereto c. first and second mutually substantially perpendicular sides defining a plane, said first side having upper and lower generally rectangular tabs extending therefrom and separated by a space therebetween, said space being dimensioned to snugly receive a kingpin lower flange, said upper tab being dimensioned to be snugly received along said shank b. A tool for inspecting a trailer kingpin and adjusting a fifth wheel hitch, said kingpin comprising a lower flange and a shank, said hitch comprising a bolt having a hexagonal cap for adjusting the amount of play when a kingpin is engaged therein, said tool comprising a plate, said plate having: a. Reversible self-retaining ratcheting wrenchġ. Vehicle alignment measurement apparatus and method Rigid gauge for trailer kingpin assessment
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