| 摘要 |
<p>1. Extensible tow coupling for road vehicles, comprising a double-acting hydraulic jack (24), whereof the rod (28) is connected to the hitch means achieving the coupling of a second vehicle to a first vehicle, in particular to a pulling vehicle and whereof the body is connected to the structure of said second vehicle, as well as a hydraulic circuit comprising lines connected to each of the chambers of the double-acting jack (24) and of the control members making it possible to move the piston (35) of said jack and thus to vary the distance separating the two vehicles, characterised by the fact that it comprises distance detection means (7) capable of emitting a signal indicating the relative position between the two vehicles by means of a target (8) carried by one of said vehicles, as well as a central control unit (62) connected to the said distance detection members and to the said control members of the hydraulic circuit for automatically initiating the extension or retraction of the double-acting jack (24) depending on the relative position of the vehicles, the said hydraulic circuit also comprising safety control means initiating the extension of said jack in the case of complete or partial break-down by virtue of a hydropneumatic accumulator (60).</p> |
