Abstract: A device to be installed in any type of door, be it of glass, wood, aluminum or steel, in order to allow its automatic and controlled opening or closing, with minimum effort. The configuration 10 consists of a cap 20 and a wrapper 30, having in the inner part of the wrapper a plate-type spring 40, a fixed drum cam 50 and a movable drum cam 60. If the mechanical spring is installed in the center of the door, it can be rotated 360 degrees with displacement points at 90 degrees and 270 degrees and stop points at 180 degrees and 360 degrees.

Abstract: A structural arrangement is described in pneumatic floor spring of reduced dimensions, which requires a hole in the floor for its installation, providing a shielded structure that prevents the water accumulation, such pneumatic floor spring keeps the door closed by the force exerted by the plunger and when the door is opened, the pin spins along with the cam which, with the double helicoil, pushes the descendent track and the plunger.