Groutable rock anchor

Claim 1

A GROUTABLE ANCHOR ASSEMBLY FOR ENGAGEMENT WITH THE WALL OF A HOLE BORED IN A ROCK FORMATION, SAID HOLE HAVING A MOUTH, SAID ANCHOR ASSEMBLY COMPRISING: A STRESS-RESISTING ROD OF SUBSTANTIAL LENGTH HAVING INNER AND OUTER END PORTIONS AND ADAPTED FOR INSERTION AXIALLY INTO SAID HOLE WITH SAID OUTER END PORTION ADJACENT SAID MOUTH AND SAID INNER END PORTION BEING DEFORMED; TEMPORARY ROCK-GRIPPING MEANS DISPOSED INTERMEDIATE SAID PORTIONS NEARER THE OUTER END THAN THE INNER END AND INCLUDING CIRCUMFERENTIALLY SPACED SHOES READILY ACCESSIBLE FROM SAID MOUTH AND ADAPTED TO BE ENGAGED WITH THE WALL OF SAID HOLE AND ENGAGING SAID OUTER PORTION OF SAID ROD, SAID SPACED SHOES DEFINING A CHANNEL BETWEEN SAID INNER AND OUTER PORTIONS FOR THE INTRODUCTION OF GROUT, SAID TEMPORARY ROCK-GRIPPING MEANS BEING ADAPTED TO RESTRAIN SAID ASSEMBLY AGAINST RETRACTION WHILE PERMITTING INSERTION THEREOF RELATIVE TO SAID WALL, SAID ROCK-GRIPPING MEANS IN GRIPPING POSITION PROJECTING RADIALLY BEYOND SAID ROD; A REMOVABLE SURFACE PLATE OF LARGER AREA TRANSVERSE TO SAID ROD THAN THE CROSS SECTION OF SAID ROCK-GRIPPING MEANS IN GRIPPING POSITION, SAID PLATE HAVING AN APERTURE RECEIVING SAID OUTER PORTION; MEANS FOR APPLYING FORCE BETWEEN SAID SURFACE PLATE AND SAID TEMPORARY MEANS VIA SAID OUTER PORTION AND INCLUDING A THREADED PORTION ON SAID OUTER PORTION AND NUT MEANS ENGAGING SAID THREADED PORTION AND SAID PLATE; GROUT-SUPPLY MEANS INTERSECTING SAID SURFACE PLATE; AND MEANS FORMING A VENT CONDUIT EXTENDING SUBSTANTIALLY FROM SAID SURFACE PLATE AND BETWEEN SAID SHOES TO A POINT ADJACENT TO THE INNER END OF SAID ROD.