Patent ID: 6139107
Filing Date: 2000-10-31
Classification: A47C

Abstract:
An armrest adjusting mechanism, comprising a supporting sleeve, a lower end of which is mounted onto or connected to a chair or the like, and an outer casing, an upper end of which is connected to an armrest of the chair;said supporting sleeve being fixedly provided in an upper part with a round joint pipe having a proper length and consisting of two vertically extended curved halves, a first curved half of said joint pipe being provided with a plurality of rows of spaced locating through holes, and a second curved half of said joint pipe being provided at an inner surface with a plurality of horizontally spaced stop grooves of proper depth; andsaid outer casing being put around said supporting sleeve and having an elbow-shaped control arm consisting of a horizontal part with an upward bend and a substantially straight vertical part positioned therein, a lower end of said vertical part of said control arm downwardly extending into a space between said two halves of said joint pipe, and said horizontal part of said control arm being supported in an opening near a top of said outer casing with a free end of said horizontal part extended from said opening to provide a hand control and said upward bend elastically and pivotally connected to said outer casing in said opening by means of two springs; said vertical part of said control arm being provided at the lower end with a locating means that radially projects from one side of said vertical part facing said first half of said joint pipe and has a profile suitable for easily engaging into each individual locating hole, said vertical part of said control arm being also provided at the lower end at another side opposite to said locating means with a stop arm that extends outward and downward from the lower end of said control arm to face toward said second curved half of said joint pipe; a distance by which said stop arm outward extends being so determined that when said locating means is disengaged from said locating holes, a free end of said stop arm would most preferably extend into and elastically press against one of said stop grooves;whereby when said hand control extended from said outer casing is upwardly pushed, said lower end of said control arm is pivotally shifted away from said first half of said joint pipe, causing said locating means to disengage from said locating hole and thereby allowing said outer casing to be moved upward or downward or rotated relative to said supporting sleeve to a desired position, and when said hand control is released, said lower end of said control arm is pivotally shifted toward said first half of said joint pipe to cause said locating means to engage into said locating hole at a selected position and thereby easily complete adjustment of said armrest to a desired height and angle relative to said chair at one time.