Jet cleaning apparatus and groove router for concrete pavements

Claim 1

IN APPARATUS FOR CLEANING AND ROUTING OUT EXPANSION JOINTS AND CRACKS IN CONCRETE PAVEMENTS, SUCH AS AIRPORT RUNWAYS, TO REMOVE OLD AND DECOMPOSED FILLERS AND SEALANTS AND ACCUMULATED FOREIGN MATERIALS FROM SAID EXPANSION JOINTS AND TO ENLARGE AND SHAPE SAID CRACKS, PERPARATORY TO REPLACING SAID FILLERS AND SEALANTS AND FILLING SAID CRACKS, THE COMBINATION OF AN AUTOMOTIVE VEHICLE HAVING A FRAME, AN ELONGATED BOOM HAVING ONE IF ITS ENDS PIVOTALLY CONNECTED TO THE FRAME OF SAID VEHICLE, FORWARDLY THEREOF, AND NORMALLY EXTENDING SUBSTANTIALLY HORIZONTALLY, FORWARDLY OF SAID VEHICLE, HYDRAULICALLY OPERABLE MEANS ACTING ON SAID FRAME AND SAID BOOM WHEREBY THE INCLINATION OF SAID BOOM MAY BE ADJUSTED WITHIN PREDETERMINED LIMITS, AN ELONGATED SKID BELOW SAID BOOM HAVING A PAIR OF SUPPORTING RUNNERS ENGAGEABLE WITH A CONCRETE PAVEMENT ON OPPOSITE SIDES OF AN EXPANSION JOINT OR CRACK THEREIN, DRAFT MEANS WHEREBY SAID SKID IS CONNECTED TO SAID BOOM, SUSPENSION MEANS WHEREBY SAID SKID CONNECTED TO SAID BOOM REARWARDLY OF SAID DRAFT CONNECTION, A PAIR OF PLOWS ON SAID SKID IN TANDEM RELATION TO EACH OTHER, ENGAGEABLE WITH AN EXPANSION JOINT OR CRACK IN A CONCRETE PAVEMENT, A DOWNWARDLY EXTENDING NOZZLE ON SAID SKID, BETWEEN SAID PLOWS, ARRANGED TO DIRECT A STREAM OF FLUID AT HIGH VELOCITY AGAINST AN EXPANSION JOINT OR CRACK IN A CONCRETE PAVEMENT IN THE PATH OF SAID PLOWS, MEANS ON SAID VEHICLE FOR SUPPLYING FLUID TO SAID NOZZLE AT PREDETERMINED SUPERATMOSHPERIC PRESSURE AND MEANS ON SAID SKID ENCLOSING SAID PLOWS AND SAID NOZZLE AND SUCH CONFINING FLUID AS DISCHARGED FROM SAID NOZZLE AND SUCH MATERIAL AS MAY BE DISPLACED FROM AN EXPANSION JOINT OR CRACK IN A CONCRETE PAVEMENT AGAINST WHICH SUCH FLUID MAY BE DIRECTED.