| 摘要 |
PURPOSE:To achieve reliably locked condition in a coupler for coupling between a tractor and a trailer, by constructing the coupling device for engaging/disengaging the king pin of trailer such that the retracted condition of a wedge chip under opening of main jaw is maintained through engagement of the wedge chip and a ratch member. CONSTITUTION:When receiving and coupling a king pin, the king pin (not shown) is received under the condition a shown on the drawing then an operating arm 8 is pushed by the king pin to rotate counter-clockwise around a pin 6. Consequently, a projection 10 will push the pin 9 of main jaw 5 to rotate said jaw 5 in same direction thus to hold the king pin. Then the stop/hold section 32 of main jaw 5 is engaged with the end section of second ratch member 27 to rotate said member 27 against a spring 29 thus to disengage a stopper chip 31 and a stop notch section 24. Consequently, a wedge chip 12 is advanced through a spring 15 to lock main jaw 5 thus to prevent removal of king pin reliably. |
