Vise for lapidary saw

Claim 1

IN A LAPIDARY SAW ASSEMBLY, A SAW UNIT COMPRISING A PIVOTED MEMBER HAVING A VERTICAL ROTARY SAW ON THE FREE END PORTION THEREOF, AND A WORK HOLDER COMPRISING A SUPPORT SUBJACENT SAID PIVOTED MEMBER, A SHAFT ROTATABLY MOUNTED ON THE SUPPORT PERPENDICULAR TO THE PLANE OF THE SAW, A WORK-CLAMPING ANGLE BRACKET SECURED ON THE END OF SAID SHAFT LOCATED SUBSTANTIALLY IN THE PATH OF SWINGING MOVEMENT OF THE SAW, SAID ANGLE BRACKET BEING PROVIDED WITH A PAIR OF SPACED UPSTANDING STUDS ADAPTED TO RECEIVE A WORKPIECE THEREBETWEEN AND A CLAMPING BAR ENGAGEABLE ON SAID STUDS FOR CLAMPINGLY-SECURING THE WORKPIECE ON THE ANGLE BRACKET, A BRACKET MEMBER ON THE SUPPORT ROTATABLY RECEIVING SAID SHAFT, SAID SHAFT HAVING OPPOSING FLATTENED SURFACES ON THE PORTION THEREOF RECEIVED IN THE BRACKET MEMBER, AND A CLAMPING SCREW ON THE BRACKET MEMBER LOCKINGLY ENGAGEABLE WITH SAID FLATTENED SURFACES TO LOCK THE SHAFT IN EITHER OF TWO DIAMETRICALLY OPPOSITE ADJUSTED POSITIONS THEREOF.