gagement with the rack。 This position is mechanically secured actuation ‹at the locking members  HO。 The motor  é2  insy  then  be  relieved   of  pressure  or  main-

2。

A jack-up platform locking apparatus as defined in claim 1wherein。 said means for vertically adjusting said locking  means comprises:

4,255,069

7 8

hydraulic motor means operably positioned between  vertically  adjustable   with   respect   to  the  platform said deck and said lock means to vertically raise or through the provision of a rack longitudinally extending lower said lock means to facilitate compatible en- along said leg and a pinion and motor drive secured to gagement of said at least one tooth with said com-      said deck, wherein said lock means  comprises:

patibly  configured  surface on said leg  of the  off-   f a chock having  at least  a pair of teeth  for  engaging shore platform。 the rack of said leg, said chock being carried by and

3。A jack-up platform locking apparatus as defined in horizontally   guided  for  translation   within said claim 1 wherein means for horizontally engaging  and frame means。

disengaging said at least one tooth comprises: 8。 A jack-up platform locking apparatus as defined in hydraulic motor means operably positioned between to claim 7 wherein:

said frame means and said lock means for advanc- said means for vertically adjusting comprises at least ing or retracting said at least one tooth of said lock one hydraulic  motor  means  operably connected means with respect to said compatibly configured between said frame means and said chock; and surface on said leg of the offshore platform。 said means for horizontally  actuating  comprises  at

4。A jack-up platform locking apparatu6 as defined in IS least  one  hydraulic  motor  means  operably con- claim 1 wherein said means for vertically securing com- nected between said frame means and said chock。 prises: 9。 A jack-up platform locking apparatus as defined in threaded mechanical securing means operably  con- claim 8 wherein said means for vertically securing com-

nected between said deck and said lock means for prises:

mechanically setting in vertical position said lock  20 locking screw means operably secured to said  deck

means with respect to said leg。

5。A jack-up platform locking apparatus as defined in claim 1 wherein said means for horizontally securing comprises:

and operably abutting against said chock。

10。 A jack-up platform locking apparatus as defined in claim 9 wherein said means for horizontally securing said lock means comprises:

wedge means operably  positionable  between  said  25 wedge  means  operably  positionable  between said

frame means and said lock means。

6。 A jack-up platform locking apparatus as defined in claim 5 and further comprising: