Device for automatic adjusting angle of chair back restrod

The utility model discloses a device for automatically adjusting the angle of a leaning rod for a chair back, which is mainly composed of two abutting rod pieces, two fixed seats, an elastic sheet and a thick spring, wherein, the two fixed seats are respectively fixed in the two abutting rod pieces, and inserting slots are formed on the opposite ends of the two fixed seats; both ends of the elastic sheet are fixedly inserted into the inserting slots of the two fixed seats; the thick spring is fixed out of the abutting position of the two rod pieces. The device replaces a steel wire bundle and a thin spring in the prior art by the elastic sheet, so the whole device has the advantages of convenient and easy assembling operation, time saving and labor saving.