New Scissor mechanism without sliding elements
The scissor mechanism uses criss-cross (X patterns) rigid elements to elongate a shape maintaining the end elements parallel to each other. Conventional scissor mechanisms used for example in scissor lifts have one edge of the end elements sliding or rolling.
In this mechanism there is no need to provide any sliding or rolling elements. This is achieved by removing one hinge in the end criss-cross pairs and adding a short element at the to ends.
This new mechanism has the advantage of using only hinged connections which are simpler and not prone to jamming