Pedal-ring tightening structure

摘要

A pedal-ring tightening structure includes a pedal ring coupled to a supporting central tube of a seat at a predetermined height. At least two clamping elements are coupled to the periphery of the central tube at a predetermined height, such that a sleeve disposed centrally at the pedal ring formed peripherally and integrally with a predetermined width is coupled to the periphery of the clamping elements. A protruding portion extending from an inner rim of a fixing ring is inserted into a space concavely disposed at the upper end of each said clamping element to abut against precisely and press inward each said clamping element coupled to the periphery of the central tube, such that the pedal ring is steadily clamped and positioned at the central tube upon assembly.

主权项

1. A pedal-ring tightening structure comprising a pedal ring coupled to a supporting central tube of a seat, wherein
a clamping unit is coupled to a periphery of the supporting central tube at a predetermined height;
the clamping unit comprises at least two clamping elements, a fixing ring, and the pedal ring formed peripherally and integrally with a predetermined width; the clamping elements each taper upward; a lower portion of each said clamping element extends to form a groove-containing engaging portion at a predetermined height to insert the groove-containing engaging portion into a slot penetrating a sleeve disposed centrally at the pedal ring; protruding partition-baffle portions are disposed at an upper portion of each said clamping element, anda space is concavely disposed between the partition-baffle portions, wherein a protruding portion extending from an inner rim of the fixing ring is inserted into the space disposed at the upper end of each said clamping element to abut against and press inward each said clamping element coupled to a periphery of the central tube, such that the pedal ring is steadily clamped and positioned at the central tube upon assembly.