Locking device for building panels and the like

Claim 1

IN A BUILDING WALL CONSTRUCTION WHEREIN PANELS ARE ATTACHED TO A GRID, A MOUNTING PLATE CONSTITUTING A PART OF SAID GRID AND HAVING AN APERTURE, A LOCKING DEVICE MOUNTED UPON SAID MOUNTING PLATE, SAID LOCKING DEVICE COMPRISING A TUBULAR BOLT HAVING AN AXIAL BORE ENTIRELY THERETHROUGH AND A LOCKING MEMBER, SAID BOLT PASSING THROUGH SAID PLATE AND THREADEDLY ENGAGING SAID LOCKING MEMBER, SAID LOCKING MEMBER HAVING A TAB ENGAGEABLE WITH SAID PLATE UPON ROTATION OF SAID BOLT IN ONE DIRECTION, TO HOLD SAID LOCKING MEMBER AGAINST ROTATION WITH SAID BOLT IN AN UNLOCKING POSITION, WHREBY SAID LOCKING MEMBER, UPON ROTATION OF SAID BOLT IN SAID ONE DIRECTION, MOVES TO AN UNCLAMPING POSITION, MEANS OPERATIVE UPON ROTATION OF SAID BOLT IN THE OTHER DIRECTION, TO HOLD SAID LOCKING MEMBER AGAINST ROTATION WITH SAID BOLT IN A LOCKING POSITION, WHEREBY SAID LOCKING MEMBER, UPON ROTATION OF SAID BOLT IN SAID OTHER DIRECTION, MOVES TO A CLAMPING POSITION, SAID BOLT HAVING AN INTERNAL TOOL ENGAGEABLE CONFIGURATION SMALLER THAN THE SAID BORE, WHEREBY SAID BOLT MAY BE ROTATED FROM EITHER END BY A CORRESPONDINGLY CONFIGURED TOOL HAVING A SHANK OF A SIZE WHICH WILL PASS THROUGH SAID TOOL ENGAGEABLE CONFIGURATION, AND SAID TOOL MAY BE PASSED ENTIRELY THROUGH SAID BOLT TO OPERATE A LIKE LOCKING DEVICE HAVING A LIKE BOLT IN AXIAL ALIGNMENT WITH THE FIRST MENTIONED BOLT.