No-back brake structure for semitrailer landing gear leg

Claim 1

IN A LANDING GEAR LEG FOR SEMI-TRAILERS OR THE LIKE HAVING TELESCOPING LEG SECTIONS OPERABLY INTERCONNECTED BY A JACKSCREW AND RECIRCULATING BALL NUT, IMPROVED BRAKE STRUCTURE FOR PREVENTING LOAD-INDUCED RETROGRADE OPERATION OF SAID JACKSCREW COMPRISING, A ROTATABLE SHAFT OPERABLY CONNECTED WITH SAID JACKSCREW, AN INERTIA MASS ROCKABLE SUBSTANTIALLY CONCENTRIC ON SAID SHAFT, MEANS PROVIDING A RATCHET HAVING AN ANNULAR ARRAY OF TEETH SURROUNDING SAID INERTIA MASS AND SUBSTANTIALLY CONCENTRIC WITH THE AXIS OF SAID SHAFT, PAWL MEANS CARRIED BY SAID INERTIA MASS, FIRST SPRING MEANS CARRIED BY SAID INERTIA MASS STRESSED TO BIAS SAID PAWL MEANS OUT OF ENGAGEMENT WITH SAID RATCHET, SAID PAWL MEANS AND SHAFT HAVING MEANS FORMING A DRIVING CONNECTION THROUGH WHICH ROTATION OF SAID SHAFT IS IMPARTED TO SAID INERTIA MASS AT NORMAL OPERATING ACCELERATIONS OF SAID JACKSCREW IN A RETROGRADE DIRECTION, SAID DRIVING CONNECTION INCLUDING MEANS OPERABLE TO EXERT OUTWARD FORCE ON SAID PAWL MEANS GREATER THAN THE INWARD BIAS OF SAID FIRST SPRING MEANS RESPONSIVE TO INERTIA LAG OF SAID MASS RELATIVE TO SAID SHAFT UPON EXTRAORDINARY RETROGRADE ACCELERATION OF SAID SHAFT, WHEREBY TO SHIFT SAID PAWL MEANS RADIALLY OUTWARDLY INTO ENGAGEMENT WITH SAID RATCHET WHEN SAID PAWL MEANS AND RATCHET TEETH ARE RADIALLY DISALIGNED, SAID DRIVING CONNECTION INCLUDING SECOND SPRING MEANS YIELDABLE TO THE FORCE OF SAID INERTIA LAG WHEN SAID PAWL MEANS IS OBSTRUCTED FROM OUTWARD SHIFTING BY RADIAL ALIGNMENT THEREOF WITH A RATCHET TOOTH, SAID SECOND SPRING MEANS IN YIELDED CONDITION THEREOF BEING OPERABLE TO URGE SAID PAWL MEANS OUTWARDLY WITH A FORCE GREATER THAN THE INWARD BIAS OF SAID FIRST SPRING MEANS, WHEREBY TO SNAP SAID PAWL MEANS INTO ENGAGEMENT WITH SAID RATCHET WHEN SAID PAWL MEANS AND RATCHET TOOTH DEPART FROM RADIAL ALIGNMENT.