Patent ID: 8336166

Claim:
A hinge damper having a housing filled with oil, a check valve controlling a flow of the oil, a rod connected to the check valve, and a spring returning the check valve, the hinge damper comprising: a cylindrical housing having an opened end and a closed end; a bumper attached at an outer portion of the housing; a spring inserted in the housing; a spring holder for holding the spring, the spring holder being disposed at a side of the spring; a piston disposed at a side of the spring holder and provided with a fluid passage; a backup ring formed between the spring holder and the piston; a rod fixed to the piston and extending out of the housing; a stopper formed at a side of the piston and provided with an opening hole; a sponge formed at a side of the stopper; a seal support formed at a side of the sponge; and a cover formed at a side of an oil seal and closing the opened end of the housing, wherein a seal flat portion is formed on an outer circumference of the oil seal and is provided at a center with a rod insertion hole, an inclined seal operation portion extending from the oil seal while defining a space portion.