Patent ID: 8167100

Claim:
A damping device for a toil seat cover, comprising: an axle ( 1 ), a housing ( 2 ), a unidirectional member ( 3 ), and damping oil; with said housing ( 2 ) having two obstructing walls ( 21 ) integrally and extensively installed on an inner wall of said housing ( 2 ) toward a center thereof for contacting an outer wall of said axle ( 1 ); said axle ( 1 ) including two inward symmetric ribs ( 11 ) integrally extended thereon, said ribs ( 11 ) further axially defining a slot ( 12 ) to pivotally receive said unidirectional member ( 3 ); said unidirectional member ( 3 ) being movable disposed within said slot ( 12 ); said slot ( 12 ) including gaps ( 15 , 16 ), formed at intervals, and, respectively, spaced on two slot walls ( 13 , 14 ) thereof; said unidirectional member ( 3 ) and said axle ( 1 ) being hermetically coupled to said housing ( 2 ), and an unoccupied space inside said sealed housing ( 2 ) being filled up by said damping oil; wherein a plurality of oil holes ( 31 ), defined within said slot ( 12 ) and on said unidirectional member ( 3 ), being staggered with said gaps ( 15 ) on said slot wall ( 13 ), and communicated with other gaps ( 16 ) on another slot wall ( 14 ) within said slot ( 12 ); and a side of said unidirectional member ( 3 ) that contacts said slot wall ( 14 ) being axially disposed with a plurality of longitudinal bars ( 33 ) said axle ( 1 ) further includes a hollow axle body ( 17 ) and a metal shaft ( 18 ) fixed within said axle body ( 17 ); said axle body ( 17 ) is integrally formed for sealing a bottom portion ( 171 ) at a bottom end of the housing ( 2 ), and said bottom portion ( 171 ) is installed inside said bottom end of the housing ( 2 ); an inner side of the bottom portion provides with an oil slot ( 172 ) defined with an angle; and said two obstructing walls ( 21 ), along with said two ribs ( 11 ), dividing an inner accommodation of said housing ( 2 ) into four rooms ( 91 , 92 , 93 , 94 ) of variable volume, depending on whether said toil seat cover is lifted up or pull down: when said toil seat cover is lifted up, said damping oil flows from rooms ( 91 and 93 ) to rooms ( 92 and 94 ), reducing the damping, and when said toil seat cover is pulled down, said damping oil flows from rooms ( 92 and 94 ) to rooms ( 91 and 93 ), creating a maximum damping right before reaching a toil seat.