One-way rotary damper

A one-way rotary damper, comprising:

• a housing having a substantially flat, cylindrical internal cavity defined by means of a bottom wall, a peripheral side wall, and an upper wall;
• a rotor comprising a braking disk having a plurality of radial blades disposed within said cavity of said housing, and a shaft unitary with said baking disk and projection upwardly toward the outside of said housing through said upper wall thereof;
• viscous oil filling said housing cavity for applying shearing resistance against rotation of said rotor braking disk;
• a driven gear rotatably mounted upon an end portion of said rotor shaft projecting outwardly from said housing so as to be free to rotate with respect to said end portion of said rotor shaft, and provided with a circular depression and an annular groove surrounding said circular depression;
• a coupling disk identical in diameter with said circular depression and mounted upon said end portion of said rotor shaft projecting outwardly from said housing so as to rotatably seat said circular depression of said driven gear;
• and
• a clutch spring disposed within said annular groove of said driven gear and annularly surrounding said coupling disk and said circular depression of said driven gear so as to extend along the radially outer surfaces of said coupling disk and said circular depression, and along the radially inner surface of said annular groove, for enabling said driven gear to freely rotate when a torque is applied thereto in a first direction, and for gripping said outer surface of said coupling disk so as to rotate said rotor together with said driven gear when a torque is applied said driven gear in a second opposite direction.