Handrail folding mechanism

Abstract

This invention relates to an armrest folding mechanism, which mainly consists of fixed protrusions on both sides of the chair back tube corresponding to the pivot assembly for mounting the armrest. A nesting cylinder is provided on each fixed protrusion, and the nesting cylinder is embedded within the armrest and positioned by a pivot assembly. A track is then provided around the surface of the nesting cylinder to allow the armrest to slide and move. This track includes paths for horizontal and vertical displacement of the armrest, as well as downward rotation for folding. In this way, the armrest can not only be positioned in a horizontal position for convenient use and standing up, but also naturally rotate outward and slide downward to reduce volume and facilitate transportation.

Claims

1. An armrest folding mechanism, mainly comprising armrests pivotally assembled on fixed protrusions on both sides of a chair back tube, wherein a folding mechanism is provided between the fixed protrusions and the armrests, the folding mechanism comprising: a nesting cylinder correspondingly attached to the fixed protrusions, with the armrests covered on the outside, the nesting cylinder having an internal space, a shaft hole provided on the end face of the internal space, and a track for sliding displacement of the armrests circumferentially provided on the surface of the nesting cylinder, the track including an upward rotation path, an outward movement path, a downward rotation path and a return path; a pivot correspondingly inserted through the internal space of the nesting cylinder, the shaft hole and the armrests, for pivotally positioning the armrests on the nesting cylinder; an elastic member correspondingly sleeved on the pivot and located in the internal space of the nesting cylinder; and a locking pin inserted through the armrests into the nesting cylinder and located on the track, capable of sliding displacement on the track.

2. The armrest folding mechanism as claimed in claim 1, wherein a bushing is further provided outside the pivot, and a stop plate is provided at one end for the elastic member to abut against, thereby limiting the elastic member in the internal space.

3. The armrest folding mechanism as described in claim 2, wherein a cover is further provided at the opening end of the interior space to close the interior space.

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