Push-pull device for containers

Claim 1

A PUSH-PULL ATTACHMENT DEVICE ADAPTED FOR COOPERATION WITH BARS CARRIED ON A CONTAINER SPACED IN THE DIRECTION OF INTENDED MOTION OF THE CONTAINER AND EXTENDING TRANSVERSE TO THE DIRECTION OF CONTAINER MOTION, SAID DEVICE COMPRISING A TUBULAR HOUSING HAVING A CLOSED ARCUATE FREE END, SAID HOUSING HAVING A PORTION CUT AWAY ADJACENT SAID FREE END TO PROVIDE TWO SPACED AND OPPOSED BARRECEIVING THROATS WHICH ARE SPACED FROM EACH OTHER ALONG THE LONGITUDINAL AXIS OF SAID HOUSING, SAID HOUSING BEING ADAPTED TO UNDERLIE A CONTAINER WITH SAID BAR-RECEIVING THROATS ADJACENT TO THE CONTAINER BARS, A RECTILINEARLY MOVABLE PIVOTAL MOUNTING FOR SAID HOUSING DISPOSED BELOW SAID BAR-RECEIVING THROATS AND PERMITTING PIVOTAL MOVEMENT OF SAID HOUSING AND AN AXIS TRANSVERSE TO ITS DIRECTION OF RECTILINEAR MOTION, RESILIENT MEANS BIASING SAID HOUSING ABOUT ITS PIVOTAL AXIS TO URGE SAID THROATS INTO BARRECEIVING POSITION, AN ABUTMENT SLIDABLY MOUNTED INTERIORLY OF SAID HOUSING AND MOVABLE BETWEEN A FIRST POSITION BLOCKING ENTRY OF A CONTAINER BAR INTO THE ONE OF SAID THROATS ADJACENT THE CLOSED END OF SAID HOUSING AND A SECOND POSITION BLOCKING ENTRY OF A CONTAINER BAR INTO THE OTHER THROAT, AND A POWER ELEMENT WITHIN SAID HOUSING FOR MOVING SAID ABUTMENT BETWEEN SAID POSITIONS, WHEREBY AS SAID HOUSING IS MOVED RECTILINEARLY BENEATH A CONTAINER THE ARCUATE CLOSED END OF SAID HOUSING ENGAGES THE CONTAINER BARS PIVOTAL SAID HOUSING DOWNWARDLY SO AS TO INITIALLY CLEAR SAID BARS WITH SAID RESILIENT MEANS RETURNING SAID HOUSING TO A POSITION FORCING THE BARS INTO ONE OR THE OTHER OF SAID THROATS DEPENDING UPON WHETHER SAID ABUTMENT IS IN ITS SAID FIRST OR SECOND POSITIONS AS SAID CUT AWAY PORTON OF THE HOUSING REGISTERS WITH THE BARS.