Patent 10920474 was granted and assigned to Sugatsune on February, 2021 by the United States Patent and Trademark Office.
A hinge device is configured to apply an urging force to a case for returning the case to its neutral position. The hinge device comprises a first and a second contact portion, the case with a cylindrical portion1, a coil spring fitted in the cylindrical portion1 of the case, a shaft inserted inside the coil spring, and a shaft member having a first and a second engaging portion fixed to the shaft in anti-rotatable. The first and second contact portion are formed integral with the cylindrical portion1.