Recess couple gasket

The utility model discloses a recess couple gasket of pivot, the couple gasket includes gasket body and positioning tongue sheet, and gasket body central point puts and is provided with the round hole, is equipped with a plurality of locating hole between this internal week of gasket and the periphery, and positioning tongue sheet sets up on the inside wall of locating hole. The pivot with pass the round hole, make the gasket body rotate relatively. Positioning tongue sheet and other the part cooperations stationary use who is connected the pivot. Positioning tongue sheet sets up on being close to the locating hole lateral wall of gasket body neighboring, positioning tongue sheet's the thickness that highly is greater than the gasket body. The utility model discloses a positioning tongue sheet can take in in the locating hole in folding back, compares the positioning tongue sheet in prior art, and the whole area size of couple gasket after the expansion reduces, and required diameter space also diminishes sim