Door damping system

A door damping system comprising a base, a fixing element, a rod connecting between said base and said fixing element which is fixed to a door and a cylinder, said base being fixed to a wall and having a first recess defined in an upper side thereof and said first recess being defined by a bottom which has a first hole defined therein, a second recess defined in a bottom side of said base and said second recess coaxially communicating with said first hole, a side slot defined in said base near an outer side of said base and opposite to said wall and extending perpendicular to an axis of said first recess, said side slot extending from a front surface of said base through said base and to a rear surface of said base wherein said side slot communicating with said first recess via a middle hole defined in said base and located between said first recess and said side slot, a first slit defined in said bottom side of said base and communicating with said second recess and opposite to said outer side of said base;

• a pinion having a T-shaped configuration and including a head and a shank, said shank having a second slit defined longitudinally therein and extending from a bottom of said shank, a threaded recess defined in said shank and extending from said bottom of said shank, said head being received in said first recess and said shank extending downwardly through said first hole of said base;
• a coil spring received in said second recess of said base and having a first end formed in a center of said coil and a second end, said first end received in said second slit of said shank and said second end received in said first slit of said base;
• a lower cap mounted to said bottom side of said base and supporting said coil spring, said lower cap having a second hole defined centrally therein and having a third recess defined in a bottom thereof receiving a connecting block therein which has a through hole defined longitudinally therein and a side hole defined radially from a periphery thereof, said side hole communicating with said through hole;
• said rod having a first end and a second end, said first end thereof having a fourth hole defined radially therethrough, said first end of said rod being inserted into said side hole of said connecting block and a bolt extending through said through hole, said fourth hole and engaged with said threaded recess of said shank of said pinion, said second end thereof having a frame formed thereto so as to define an elongated space between the rod and the frame for receiving a stud extending from said fixing element therein;
• said cylinder securely disposed to said front surface of said base and having a first end and a second end, said first end thereof having an end plug to close said first end and said second end thereof having a bottom, said end plug having a central hole defined therethrough and a piston rod being slidably received therein, said piston rod having a first end and a second end, said first end thereof having a rack inserted in said side slot of said base for an engagement with said pinion, said second end thereof having a piston disposed thereto, said piston having a first clearance defined between said piston rod and said piston and having a first flange and a second flange respectively extending radially from an outer periphery thereof and defining a first groove between said first and said second flanges, said first flange having an outer diameter smaller than an inner diameter of said cylinder such that a gap is defined between said first flange and said cylinder, said second flange having a plurality of sixth holes defined therein, a ring movably disposed between the first flange and the second flange and being able to be moved to contact against the first flange and the second flange depending upon a movement of said piston rod, a second clearance defined between an inner periphery of said ring and said piston rod, said gap being sealed by said ring when said piston is moved toward said bottom of said cylinder.