EXTENDABLE TRUSS OF CANTILEVER SPAN OF ALTERNATE OVERHANG Russian patent published in 2019 - IPC E01D15/20 

FIELD: construction.

SUBSTANCE: invention can be used in construction, particularly in bridge construction, as well as in lifting equipment. Extendable truss of cantilever span of alternate overhang consists of at least one section, which comprises cross piece consisting of two braces of identical length, pivotally connected to each other in their geometric centers by "scissors" type, upper belt consisting of two rod elements of identical length, pivotally connected to each other by one of their ends, and by other ends of pivotally connected to upper ends of corresponding crosspiece braces, lower belt consisting of two rod elements of the same length, pivotally connected to each other by their one ends, and by other ends of pivotally connected to lower ends of corresponding crossbars. Each section additionally comprises a vertical connection formed by two toothed racks, one of which by its upper end is connected to the central hinge of the top section of the section, the other – by its lower end with the central hinge of the lower section of the section, vertically oriented to the geometrical center of the crosspiece and connected to each other through the gear mechanism, which provides their displacement relative to each other with the same pitch and fixation in the specified positions. Invention provides uniform distribution of forces with minimization of bending moments (main forces are longitudinal along rods).

EFFECT: invention makes it possible to design compact, having minimum material consumption.

1 cl, 3 dwg