Arrangement for detachable coupling of a trailer with pivoting wheels to a ball hitch of a vehicle

Claim 2

Arrangement for detachable coupling of a trailer equipped with pivoting wheels to a ball hitch of a vehicle, said arrangement comprising: a coupling receptacle at the forward end of the trailer to receive the ball hitch; a locking member to lock the ball hitch in the coupling receptacle; and means to prevent the trailer from rotating about a vertical axis through the ball hitch, said means for preventing rotation of the trailer about a vertical axis through the ball hitch comprising at least two opposing stops fitted at the forward end of the trailer at such a distance from each other in the lateral direction that when the trailer is coupled to the ball hitch of the vehicle the stops bear or can be brought to bear against corresponding opposing stop faces at the rear of the vehicle, the stops being two opposingly disposed screw-threaded bolts fitted to the opposing sides of a longitudinal slot in the lower end of a downwards orientated member fixedly attached to the forward end of the trailer, said longitudinal slot being adapted to receive the draw bar to which the ball hitch is attached; which bolts are so fitted that they can be screwed towards each other and the distance between them thereby adjusted so that the draw bar is a close fit between them; the downwards oriented member fixedly attached to the forward part of the trailer comprising two parts which are joined to each other pivotally, the pivot axis being coincident with the longitudinal line through the centre of the ball hitch, thereby permitting rotation of the trailer about its longitudinal axis.

Claim 3

Arrangement for detachable coupling of a trailer equipped with pivoting wheels to a ball hitch of a vehicle, said arrangement comprising: a coupling receptacle at the forward end of the trailer to receive the ball hitch; a locking member to lock the ball hitch in the coupling receptacle; and means to prevent the trailer from rotating about a vertical axis through the ball hitch, said means for preventing rotation of the trailer about a vertical axis through the ball hitch comprising at least two opposing stops fitted at the forward end of the trailer at such a distance from each other in the lateral direction that when the trailer is coupled to the ball hitch of the vehicle the stops bear or can be brought to bear against corresponding opposing stop faces at the rear of the vehicle; a rear wall of the coupling receptacle being open at least in its lower part and the locking member being a swivelling arched member partially encircling the coupling receptacle and pivotally attached to the coupling receptacle by means of a lateral axle so that in one of its extreme positions said arched member at least partially encloses the open part of the rear wall of the coupling receptacle thereby preventing detachment of the ball hitch; the arrangement further comprising a lateral bar adapted to be pushed back and forth along its own length and which has a first projection, so arranged that with the bar in one extreme position and with the arched member in its lock position said first projection extends on top of the arched member or a fixed extension thereof, and a second projection of essentially L-form in cross-section, said second projection being at such a distance from the first projection that with the bar in its other extreme position, in which position the first projection has been moved from on top of the arched member or its fixed extension, said second projection is pushed under the arched member or its fixed extension in order to raise the arched member; the essentially vertical part of the L-shaped second projection being bevelled on that edge which is towards the arched member and of such a height that the arched member is turned upwards sufficiently for the ball hitch to be detached from the coupling receptacle.

Claim 4

Arrangement for detachable coupling of a trailer equipped with pivoting wheels to a ball hitch of a vehicle, said arrangement comprising: a coupling receptacle at the forward end of the trailer to receive the ball hitch; a locking member to lock the ball hitch in the coupling receptacle; and means to prevent the trailer from rotating about a vertical axis through the ball hitch, said means for preventing rotation of the trailer about a vertical axis through the ball hitch comprising at least two opposing stops fitted at the forward end of the trailer at such a distance from each other in the lateral direction that when the trailer is coupled to the ball hitch of the vehicle the stops bear or can be brought to bear against corresponding opposing stop faces at the rear of the vehicle; a rear wall of the coupling receptacle being open at least in its lower part and the locking member being a swivelling arched member partially encircling the coupling receptacle and pivotally attached to the coupling receptacle by means of a lateral axle so that in one of its extreme positions said arched member at least partially encloses the open part of the rear wall of the coupling receptacle thereby preventing detachment of the ball hitch; the arrangement further comprising a lateral bar adapted to be pushed back and forth along its own length and which has a first projection, so arranged that with the bar in one extreme position and with the arched member in its lock position said first projection extends on top of the arched member or a fixed extension thereof, and a second projection of essentially L-form in cross-section, said second projection being at such a distance from the first projection that with the bar in its other extreme position, in which position the first projection has been moved from on top of the arched member or its fixed extension, said second projection is pushed under the arched member or its fixed extension in order to raise the arched member; the essentially vertical part of the L-shaped second projection being bevelled on that edge which is towards the arched member and of such a height that the arched member is turned upwards sufficiently for the ball hitch to be detached from the coupling receptacle.