Positioning adjustment mechanism for chair foot pedal

Abstract

A positioning adjustment mechanism for chair foot pedal, which includes a central tube having an accommodation space and an inner ring surface, the inner ring surface faces the accommodation space and has at least one protrusion, a sleeve body disposed in the accommodation space and has at least one slit, the sleeve body has an outer peripheral surface that facing the inner ring surface and defined with at least one positioning groove for receiving the protrusion, the positioning groove extends along the circumference of the sleeve body and has a loose part and a tight part in opposite directions along the circumference, the depth of the positioning slot is the slot depth, the slot depth of the tight part is shallower than that of the loose part, meaning the thickness of the tight part is greater than that of the loose part, such that when the protrusion is located in the tight part, the total thickness is greater than when it is located in the loose part, creating a compressive effect towards the center of the sleeve body.

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