Trimming boards

Claim 1

A TRIMMING BOARD HAVING A CUTTING EDGE ALONG ONE UPPER EDGE THEREOF, AN OSCILLATING CUTTING KNIFE PIVOTALLY MOUNTED AT ONE END ON SAID TRIMMING BOARD TO SWING TO AN INOPERATIVE POSITION ABOVE SAID UPPER EDGE AND ADAPTED TO COOPERATE WITH SAID CUTTING EDGE TO PRODUCE A SHEARING ACTION, A PLURALITY OF UPRIGHTS SUPPORTED ON THE UPPER SIDE OF SAID BOARD ADJACENT SAID ONE UPPER EDGE THEREOF, A CLAMPING MEMBER MOUNTED ON AND VERTICALLY MOVABLE WITH RESPECT TO SAID UPRIGHTS, A SECOND MEMBER SUPPORTED BY SAID CLAMPING MEMBER AND HAVING INCLINED SLOTS THEREIN, MEANS ON SAID CLAMPING MEMBER TO RETAIN SAID SECOND MEMBER AGAINST ALL MOVEMENT RELATIVE THERETO EXCEPT THAT OF RELATIVE LONGITUDINAL MOVEMENT, A SLOT ENGAGING MEMBER FIXEDLY MOUNTED ON EACH SAID UPRIGHT, SPRING MEANS ON SAID UPRIGHTS ENGAGING SAID CLAMPING MEMBER, MEANS MOVABLE WITH SAID CUTTING KNIFE TO ENGAGE SAID SECOND MEMBER TO MOVE SAID SECOND MEMBER LONGITUDINALLY IN ONE DIRECTION TO ELEVATE SAID CLAMPING MEMBER TO NON-CLAMPING POSITION AND COMPRESS SAID SPRINGS WHEN SAID CUTTING KNIFE IS IN ITS PIVOTED UP POSITION, SAID LAST MENTIONED MEANS ADAPTED WHEN SAID CUTTING KNIFE IS PIVOTED TO CUTTING POSITION TO DISENGAGE FROM SAID SECOND MEMBER SO THAT SAID SPRINGS ACT AGAINST SAID CLAMPING MEMBER TO CAUSE SAID SECOND MEMBER TO SLIDE LONGITUDINALLY ON SAID SLOT ENGAGING MEMBERS IN THE OPPOSITE DIRECTION TO SAID ONE DIRECTION TO MOVE THE CLAMPING MEMBER DOWNWARDLY INTO CLAMPING POSITION.