Automatic locking system for telescopic towers

Claim 1

IN COMBINATION WITH A TOWER INCLUDING AN UPPER INNER AND A LOWER OUTER TELESCOPICALLY INTERENGAGING SUPERPOSED SECTIONS, THE PROVISION OF A LOCKING SYSTEM COMPRISING AT LEAST ONE SUPPORT ARM PIVOTALLY SECURED TO THE UPPER INNED SECTION ROUND A HORIZONTAL AXIS, SPRING MEANS SECURED TO AND ACTING BETWEEN THE INTERIOR OF SAID INNER SECTION AND A PORTION OF SAID ARM SPACED FROM SAID AXIS, SAID SPRING BEING ADAPTED TO URGE SAID SUPPORTING ARM OUT OF A SLOPING NEUTRAL POSITION SELECTIVELY INTO A VERTICAL AND INTO A HORIZONTAL POSITION UPON INITIATING SHIFTING OF SAID ARM OUT OF ITS NEUTRAL POSITION TOWARDS SAID VERTICAL AND SAID HORIZONTAL POSITION, STOPS RIGID WITH SAID LOWER SECTION AND THE LOWER SURFACE OF WHICH IS ADAPTED TO BE ENGAGED BY THE PIVOTAL SUPPORTING ARMS WHEN IN A HORIZONTAL POSITION, BEARING SHOES RIGID WITH THE OUTER LOWER SECTION AT LEAST AT ONE LEVEL, THEREOF IN VERTICAL REGISTRY WITH THE SUPPORTING ARMS AND ADAPTED TO BE ENGAGED BY THE LATTER AND THEREBY HOLD THE INNER UPPER SECTION IN POSITION IN THE OUTER LOWER SECTION AND PROJECTIONS RIGID WITH THE INNER UPPER SECTION AT POINTS LOCATED ABOVE EACH BEARING SHOE AND ADAPTED TO SHIFT THE CORRESPONDING SUPPORTING ARM RESPECTIVELY FROM ITS VERTICAL POSITION INTO ITS HORIZONTAL POSITION UPON RAISING OF THE INNER UPPER SECTION ABOVE THE BEARING SHOE ON WHICH IT RESTS AND BACK FROM ITS HORIZONTAL POSITION INTO ITS VERTICAL POSITION UPON FURTHER RAISING OF SAID INNER UPPER SECTION FOR FURTHER VERTICAL MOVEMENT.