Hold down clamp

Claim 1

IN A HOLD DOWN CLAMP FOR USE ON A BED FORMED WITH A FACE ON WHICH WORK TO BE MACHINED MAY BE PLACED AND HAVING AN INVERTED T-SHAPED SLOT THEEIN FORMED WITH A VERTICAL SECTION EXTENDING THROUGH SAID FACE AND HAVING SPACED SIDE WALLS AND A HORIZONTAL SECTION DISPOSED BELOW SAID VERTICAL SECTION AND PROVIDING WAYS HAVING DOWNWARDLY FACING SHOULDERS, THE COMBINATION OF A TAILPIECE OVERLYING SAID BED, AN INCLINED CAM MEMBER FORMED ON SAID TAIL PIECE, AN INVERTED T-SHAPED POSITIONING MEMBER DISPOSED WITHIN SAID SLOT, A BASE ON SAID POSITIONING MEMBER RECEIVED IN SAID HORIZONTAL SECTION OF SAID SLOT AND A STEM ON SAID POSITIONING MEMBR RECEIVED IN SAID VERTICAL SECTION, MEANS FOR DRAWING SAID POSITIONING MEMBER UPWARDLY AGAINST SAID SHOULDERS AND SAID TAILPIECE DOWNWARDLY AGAINST SAID BED, A HEADPIECE OVERLYING SAID SLOT, A JAW ON SAID HEADPIECE DISPOSED AT ONE END THEREOF FOR ENGAGEMENT WITH AN EDGE OF THE WORK, AN INCLINED CAM MEMBER AT THE OTHER END OF SAID HEADPIECE CO-ACTING WITH THE CAM MEMBER ON SAID TAILPIECE TO URGE SAID JAW TOWARD THE WORK WHEN THE HEADPIECE IS MOVED TOWARD THE BED, A JOURNAL PIVOTED TO SAID STEM FOR SWINGING MOVEMENT ABOUT A HORIZONTAL AXIS, THREADS FORMED IN SAID JOURNAL NORMAL TO THE AXIS OF SAID JOURNAL AND A BOLT EXTENDING THROUGH SAID HEADPIECE AND SCREWED INTO THE THREADS IN SAID JOURNAL AND SERVING TO DRAW SAID HEADPIECE TOWARD SAID BED.