Retractable trailer tongue jack

Claim 1

A TONGUE JACK WHICH INCLUDES CAP MEANS WITH A DEPENDING POSITIONING PLATE WITH UPPER AND LOWER POSITIONING HOLES THEREIN, A SWIVEL PIN THE ENDS OF WHICH ARE HELD IN THE CAP MEANS, A SLEEVE ROTATABLY MOUNTED OVER THE PIN, A HOUSING THE UPPER PART OF WHICH IS ATTACHED TO THE SLEEVE, PIN MEANS SLIDABLE IN SAID UPPER PART OF THE HOUSING FOR ENGAGEMENT IN ONE OF SAID HOLES IN THE POSITIONING PLATE, THE LOWER PORTION OF THE HOUSING BEING GENERALLY CYLINDRICAL WITH A KEYWAY EXTENDING AXIALLY FROM ONE SIDE THEREOF, THE HOUSING COMPRISING A SLIDING SLEEVE WITHIN AND SUBSTANTIALLY CONCENTRIC WITH SAID UPPER PART OF THE HOUSING WITH A HOLLOW KEY EXTENDING SUBSTANTIALLY THE LENGTH THEREOF AND LOCATED WITHIN SAID KEYWAY, A WHEEL AND A FORK HOLDING THE SAME WITH AN OUTER SHAFT SWIVELLY CONNECTED WITH THE FORK, AN INNER SHAFT WITH EXTERNAL THREADS MESHED WITH INTERNAL THREADS ON THE OUTER SHAFT, A SCREW THE THREADS OF WHICH MESH WITH INTERNAL THREADS ON THE INNER SHAFT AND MEANS FOR ROTATING THE SCREW, SAID SCREW AND SHAFTS BEING WITHIN THE HOUSING.