Device for opening and shutting door and drawer

The invention relates to a device for opening and closing doors and drawers, wherein, a tense belt (4) is arranged on an external cylinder (1); an end part (4a) of the tense belt (4) is arranged on the inner wall (2a) of a piston (2); simultaneously, the piston (2) comprises an elastic flaky bevel (5) and a rotary pawl (6) which can be respectively operated on effective and invalid positions; front surfaces of the rotary pawl (6) on the positions vertically face towards a free end of the bevel (5); the rotary pawl (6) is provided with a groove (6a) which is designed to be used for inserting a flat head end (9) of a screwdriver into the groove (6a) through a triangular hole (1a) on the external cylinder (1), and the groove (6a) corresponding to the effective and invalid positions of the rotary pawl (6) is made to be positioned on the center of two opposite side faces. Because the bevel (5) is tense, the free end of the bevel is made to press down a position where the inner wall (2a) of the piston (2) is vertic