Security step or stop for slidable door

Claim 1

A unit formed of a first bar hinged to a second bar that serves as a security stop for the prevention of opening of a slidable door, when placed on the track of a said slidable door with the lower surface of each bar resting on said track in an extended position of said bars, said bars joined together by hinge at a first end of each bar so that both bars may be folded in a first circular direction about the pivot axis of the hinge from a first extended position in which a longitudinal axis of each bar forms a common straight line, to a second position in which said axes form two generally parallel lines with the lower surface of each bar facing each other, with means to prevent said bars in said first extended position from rotating to said second position in response to a longitudinal force applied against the opposed end surfaces of the bars, and permanent means to prevent said bars from rotating in said first extended positon in a second circular direction about the pivot axis of the hinge that is contrary to said first circular direction, in which one of the bars is fitted with means to lengthen the distance from the hinge to the external end surface of the said bar, and in which the opposed lower end surfaces of the two bars are each recessed so that the bearing end surface of each said end surface does not intersect the longitudinal axis of the bar that passes through the pivot axis of the hinge when the bars are in the said first position, with said longitudinal axis being spaced from the central longitudinal axis of each bar towards the lower surface of each bar so that a bearing force against said bar end surfaces, in said first extended position, creates a rotational movement contrary to said first circular direction, together with pivotable means mounted to a first bar which causes the bars to rotate in said first extended position in the said first circular direction so as to cause the pivot axis of the hinge to move past the central longitudinal axis so as to unlatch hinge joint, said pivotable means in the form of a kicker plate formed with a first section located so as to contact a base surface on which the lower surface of the first bar rests, in the extended position of the bar and with a second section located so as to extend beyond the upper profile of said first bar when the said first section is in contact with the base surface of which the first bar rests, with said kicker plate pivotally mounted to said first bar along a pivotal axis with the said first section located between the said pivotal axis and the second section such that foot pressure applied against said second section towards the base surface, when the bars are in the extended position and resting on said base surface, causes the pivot axis of the hinge to move away from said base surface so that the two bars may fold together to rotate towards the second position in response to a longitudinal applied force against bearing end surfaces of the two bars.