a pin 10 a corrugated or toothed steel pad 12 is pivotally connected to the distal end of each arm by a pin 14 and is adapted to engage the ground for static anchoring of the outrigger the outrigger arm 6 can be raised and lowered by remote control of a hydraulic piston and cylinder unit 16 which is pivotally connected between bracket 8 and the outer end of arm 6 by pins 18 and 20 respectively the unit 16 may be considered part of the movable outrigger arm the improvement in the form of a latching mechanism which is the subject of this invention is generally indicated at 22 in fig3 latching mechanism 22 consists of bracket means which includes an l shaped bracket 24 is welded to the upper side of the arm 6 a round spike or pin 26 has a threaded end secured in the bracket 24 by a pair of nuts 28 and its other protruding end has a stepped head portion 30 of a larger diameter which then has a 30 u00b0 taper to form a pointed nose 31 the bracket means also includes a pair of spaced plates 32 having openings 33 and the plates are affixed to bracket 8 to provide a fixture to hold an elastomeric ring 34 having a central opening or socket with a 60 u00b0 taper at its entrance the internal diameter d.