Importance

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Abstract

A pivot hinge includes: a fixing seat having therein a round hole from which two grooves forming an inversed “V” shape are extended downwards, the grooves include two bevel groove segments extending laterally and obliquely form the central bottom of the round hole to two different directions at the opening of the round hole, and include two vertical groove segments formed on the ends of the bevel groove segments respectively; a shaft of a rotation axle extends into the round hole; and includes: at least two mutually reversely allocated “9” shaped spring tubes each having a slipping over portion over the shaft surface, the portion is formed on its periphery a slit, a lower area of each slipping over portion has a positioning sheet extending downwards obliquely but not radially, each positioning sheet has a bottom vertical portion; the positioning sheets and the vertical portions are slipped respectively in the bevel and the vertical groove segments, an area at an upper area of each positioning sheet contacting with an upper area of a corresponding bevel groove segment forms a surface contacting fulcrum.

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First Claim