Patent ID: 6419323
Filing Date: 2002-07-16
Classification: A47C

Abstract:
An elevation mechanism for an armchair armrest, comprising a T-shaped post, a catch cylinder, an adjustment unit, a reflex plate, a U-shaped block and a resilient spring, at a center on a lower part of the T-shaped post being a U-shaped depression running from top to bottom, at the center of the U-shaped depression being a first screw hole, a cross through hole and a second screw hole, the first screw hole serving to fasten a first screw inserted in a first through aperture of the adjustment unit, a vertical slot of the cross through hole serving to accommodate a depressed groove of the adjustment unit, a horizontal slot of the cross through hole serving to accommodate a U-shaped block that goes together with the depressed groove, at a center of the adjustment unit being a third screw hole that accommodates a second screw that goes through a second through aperture of the reflex plate, the T-shaped post being inserted inside the catch cylinder, a third screw inserted into a bottom hook of the resilient spring and into the second screw hole at the bottom of the T-shaped post, a top hook of the resilient spring being engaged to a protruded block at a bottom of the adjustment unit, on a top of a back of the catch cylinder being a pin insert groove and a spring sleeve to accommodate an insert pin, while a spring and a steel ball are buried inside the spring sleeve, and the assembled mechanism being inserted inside a protective cylinder, a top of a back of the protective cylinder being a check slot and turning grooves, the check slot serving to restrict the insert pin within, to avoid over-turning of the armrest, while the turning grooves serve to trap the steel ball within to achieve a turning function of the armrest.