Lock for sectional scaffolding

Claim 1

IN A SCAFFOLD HAVING AN UPRIGHT AND A DIAGONAL BRACE BAR PROVIDED WITH A HOLE THROUGH ONE END THEREOF; THE COMBINATION THEREWITH OF A LATCH FOR RELEASABLY LOCKING SAID END OF SAID DIAGONAL BRACE TO SAID UPRIGHT, COMPRISING AN UPPER STUD FIXED TO AND PROJECTING GENERALLY HORIZONTALLY FROM SAID UPRIGHT AND PROVIDED WITH A LONGITUDINAL SLOT EXTENDING VERTICALLY THERETHROUGH AND HAVING GENERALLY PARALLEL FLAT VERTICAL LONGITUDINAL SIDE FACES, AN ABUTMENT ACROSS AND TERMINATING THE OUTBOARD END OF SAID SLOT, A LOWER STUD FIXED TO AND PROJECTING GENERALLY HORIZONTALLY FROM SAID UPRIGHT IN SPACED GENERALLY PARALLEL RELATION DIRECTLY BELOW SAID UPPER STUD AND PROVIDED WITH A LONGITUDINAL SLOT EXTENDING VERTICALLY THERETHROUGH IN VERTICAL ALINEMENT WITH SAID SLOT THROUGH SAID UPPER STUD, AN ABUTMENT ACROSS AND TERMINATING THE OUTBOARD END OF SAID SLOT THROUGH SAID LOWER STUD, SAID END OF SAID DIAGONAL BRACE BAR FITTING ON SAID LOWER STUD WITH SAID LOWER STUD PROJECTING THROUGH AND BEYOND THE HOLE THERETHROUGH, A WEDGE PLATE FITTING IN BOTH OF SAID SLOTS IN CLOSELY FITTED RELATION TO SAID SIDE FACES OF SAID SLOT THROUGH SAID UPPER STUD AND HAVING A FIRST EDGE ADAPTED TO BE BROUGHT INTO PRESSURE CONTACT WITH SAID END OF SAID BRACE BAR FITTED ON SAID LOWER STUD, AND HAVING A SECOND EDGE EXTENDING UPWARDLY FROM THE LOWER END OF SAID FIRST EDGE AT AN ACUTE INCLUDED ANGLE RELATIVE THERETO AND IN PRESSURE CONTACT WITH SAID ABUTMENT OF SAID LOWER STUD, SAID SECOND EDGE ALSO ENGAGING SAID ABUTMENT OF SAID UPPER STUD, AND A PROTUBERANCE ON THE LOWER END OF SAID WEDGE PLATE PROJECTING HORIZONTALLY THEREFROM AND RENDERING SAID WEDGE PLATE LARGER, IN A HORIZONTAL DIRECTION, THAN THE CORRESPONDING DIMENSION OF SAID SLOT THROUGH SAID UPPER STUD BUT LESS THAN THE CORRESPONDING DIMENSION OF SAID SLOT THROUGH SAID LOWER STUD WHEREBY SAID WEDGE PLATE CAN BE WITHDRAWN UPWARDLY FROM SAID LOWER STUD BUT CANNOT BE WITHDRAWN UPWARDLY FROM SAID UPPER STUD.