Patent ID: 7467826

Claim:
A resilience tilt-adjusted device of a backrest for an office chair, with the device including a backrest supporter; a casing pivotally connected to the backrest supporter; an axle rod passed through the casing as well as the backrest supporter; and an elastic adjuster, wherein: said elastic adjuster includes a compressing base and two elastic members disposed against one side of the compressing base, wherein ends of the two elastic members are leaned against said axle rod; wherein each end portion of another side of the compressing base has an inclined surface, wherein sliding pieces are arranged relatively to the inclined surfaces for operation, wherein the sliding pieces are respectively passed through with left and right threads of a screw, wherein the sliding pieces are moved axially inward or outward by turning the screw in different directions, wherein the compressing base can enter or exit from pressing the two elastic members.