Mobile power-actuated concrete saw with reaction supporting means therefor

Claim 1

IN A ROTARY POWER-DRIVEN SAW FOR SAWING A VERTICAL SURFACE, IN COMBINATION, A WHEELED BASE, SCREW MEANS TO JACK UP SAID BASE AND THUS SUPPORT THE SAME FROM A FOUNDATION SURFACE, A VERTICAL POST PROJECTING UPWARDLY FROM SAID BASE, SCREW MEANS FOR VARYING THE EFFECTIVE LENGTH OF SAID POST TO THE END THAT THE POST AND BASE AS A WHOLE MAY BE WEDGED IN FIXED POSITION BETWEEN SAID FOUNDATION SURFACE AND AN OVERHEAD SUPPORT, AN ELONGATED RACK SUBSTANTIALLY COEXTENSIVE WITH SAID POST, A PRIMARY CARRIAGE SLIDABLE VERTICALLY ON SAID POST, A PINION ON SAID CARRIAGE IN CONSTANT MESH WITH SAID RACK, A MOTOR ON SAID CARRIAGE, A POWER TRAIN OPERATIVELY COUPLING SAID MOTOR AND PINION IN DRIVING RELATIONSHIP, A SECOND ELONGATED RACK MOUNTED FOR ROTATION ON SAID PRIMARY CARRIAGE ABOUT A HORIZONTAL AXIS, MEANS FOR CLAMPING SAID SECOND RACK IN ANY SELECTED POSITION OF ANGULAR ADJUSTMENT WITH RESPECT TO THE PRIMARY CARRIAGE, A SECONDARY CARRIAGE SLIDABLY DISPOSED ON SAID SECOND RACK FOR MOVEMENTS THEREALONG IN OPPOSITE DIRECTIONS, A SAW HEAD MOUNTED ON SAID SECONDARY CARRIAGE FOR ROTATION ABOUT AN AXIS PARALLEL TO SAID HORIZONTAL AXIS, SAID SAW HEAD INCLUDING A CIRCULAR ROTARY SAW BLADE, MEANS FOR CLAMPING SAID SAW HEAD IN ANY SELECTED POSITION OF ANGULAR ADJUSTMENT WITH RESPECT TO THE SECONDARY CARRIAGE, A MOTOR MOUNTED ON AND SUPPORTED BY SAID SAW HEAD, AND MEANS OPERATIVELY CONNECTING SAID LAST MENTIONED MOTOR AND SAW BLADE IN DRIVING RELATIONSHIP.