![]() When the desired position is achieved, as just described, it is merely necessary to inactivate the solenoid 56 whereuponthe locking head 55 will return to the meshed condition with gear rack 41a, as shown in FIGURE 3, whereupon the vehicle is ready for operation.Ä¡. When such retraction has been accom plished, the trailer wheels can be locked in place and the towing vehicle moved either forwardly or rear-wardly, as desired, to effectuate a shifting of the relative positions of the trailer body 11 and towing vehicle 16, with it being apparent by this arrangement that any intermediate position between the positions of FIGURES l and 2 can be achieved as desired. At this or any other subsequent time, the king pin can be shifted relatively of the body 11 merely by operating the solenoid 56 to retract the locking head 55 from its meshed condition with the gear rack 41a. In this condition, the fifth Wheel unit can be backed into place and connected with the king pin followed by making of the hydraulic and electrical connections between the cab and towing vehicle. In use or operation of the improved adjustable king pin, it will first be understood that the component parts will be normally positioned as shown in FIGURE 3, with the teeth of the locking head 55 being meshed with the gear rack 41a so as tov preclude shifting of the king pin 53 relatively of the bed frame and of support plate 30. 'tRemaining leg 52c has a flange 52d designed to be slidably receive-d between frame 41 and guide rail 31a as will be described below. ![]() upon electric connection between the cab and trailer in known fashion. Leg 52b carries locking element 54 which includes a multi-toothed locking head member 55 that is shift-ably mounted on leg 52b so as to be actuated by In this regard, it is prefersolenoid 56 between the locked position of FIGURE 3 and the unlocked position of FIGURE 3a with solenoid 56 having a flexible connection 57 that will facilitate operation of the same from the interior of the cab. ![]() In this regard, guide block 52 is disposed on the top surface of shifting plate 50 and is of generally U-shaped configuration so as to have a base portion 52a and leg portions 52b and 52c, with base portion 52a being secured to plate 50 by king pin 53. This king pin 53 also projects upwardly slightly above the top surface of shifting plate 50 for engagement with an aperture in guide block 52 as will be described. Shifting plate 50 also includes the usual king pin 53 projecting from its bottom surface for engagement with fifth wheel assembly 12 in known fashion.
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