Armrest of chair with cushion

Abstract

An armrest of a chair with a cushion is arranged at one side of a chair and is movable for adjusting the position and orientation thereof. The armrest comprises a slidable platform and a parallel linkage means. The slidable platform has a retaining seat and a sliding seat. The retaining seat is fixed to a predetermined position at one of two sides of the chair. The sliding seat is supported by the retaining seat and is movable with respect to the retaining seat. A parallel linkage means including a main linkage and a pair of swinging linkages is pivotally connected to two ends of the main linkage. Another ends of the swinging linkages not being connected to the main linkage are pivotally connected retaining seat. The main linkage has a cushion. By the supporting of the parallel linkage means, the user can move the cushion to different positions or be at any orientation.

What is claimed is:  
     
         1 . An armrest of a chair with a cushion being arranged at one side of a chair and being movable for adjusting the position and orientation thereof; the armrest comprising: 
 a retaining seat fixedly installed to a predetermined position at one side of a chair;    a parallel linkage means including a main linkage and a pair of swinging linkages pivotally connected to two ends of the main linkage;    another ends of the swinging linkages not being connected to the main linkage being pivotally connected to the retaining seat; the main linkage having a cushion; wherein by the supporting of the parallel linkage means, the user can move the cushion to different positions or be at any orientation.    
     
     
         2 . The armrest of a chair with a cushion as claimed in  claim 1 , wherein the retaining seat is fixed to one of a supporting frames at two sides of the chairs.  
     
     
         3 . The armrest of a chair with a cushion as claimed in  claim 1 , wherein the retaining seat is fixed to two sides of a chair back.  
     
     
         4 . The armrest of a chair with a cushion as claimed in  claim 1 , further comprising a safety cover which covers the retaining seat.  
     
     
         5 . The armrest of a chair with a cushion as claimed in  claim 1 , wherein the parallel linkage means is formed by four parallel linkages.  
     
     
         6 . The armrest of a chair with a cushion as claimed in  claim 1 , wherein a plurality of stop means are installed between the swinging linkages and the sliding seat, the stop means includes a plurality of concave cavities which are installed in the retaining seat and the swinging linkages, and stop devices; the concave cavities are coupled with the stop devices so as to retain the swinging linkages to predetermined positions.  
     
     
         7 . The armrest of a chair with a cushion as claimed in  claim 6 , wherein the concave cavities are formed in the retaining seat; and the stop devices are installed in the swinging linkages; each sliding seat has at least one elastic sheet; one end of the elastic sheet is fixed, and another end extends out and has an elastic free end; the free end has a tip facing to a surface of the concave cavity; wherein by the elastic force of the elastic sheet, the tip falls into the concave cavity, thereby, the swinging linkage is retained at a predetermined position.  
     
     
         8 . The armrest of a chair with a cushion as claimed in  claim 1 , wherein a plurality of fixed limiting elements are formed at two sides of the retaining seat for confining the swinging linkages to move within a sector region.  
     
     
         9 . An armrest of a chair with a cushion being arranged at one side of a chair and being movable for adjusting the position and orientation thereof; the armrest comprising: 
 a slidable platform having a retaining seat and a sliding seat; the retaining seat being fixed to a predetermined position at one of two sides of the chair; the sliding seat being supported by the retaining seat and being movable with respect to the retaining seat;    a parallel linkage means including a main linkage and a pair of swinging linkages pivotally connected to two ends of the main linkage;    another ends of the swinging linkages not being connected to the main linkage being pivotally connected retaining seat; the main linkage having a cushion; wherein by the supporting of the parallel linkage means, the user can move the cushion to different positions or be at any orientation.    
     
     
         10 . The armrest of a chair as claimed in  claim 9 , wherein the retaining seat and the sliding seat are formed with dovetail blocks and dovetail grooves, respectively; thereby, the retaining seat and sliding seat are coupled or adjusted.  
     
     
         11 . The armrest of a chair with a cushion as claimed in  claim 9 , wherein the slidable platform includes a stop means; the stop means has a plurality of stop positions and a stop device which are installed at the retaining seat and the sliding seat, respectively, by coupling the stop positions and the stop device, the sliding seat is fixed at a predetermined position temporarily.  
     
     
         12 . The armrest of a chair with a cushion as claimed in  claim 9 , wherein a plurality of stop positions are concave cavities arranged along the sliding direction of the sliding seat; the stop device is an elastic sheet installed to the retaining seat; one end of the elastic sheet is fixed to the retaining seat, and another end thereof extends out and has an elastic free end; the free end has a tip facing a surface of the concave cavity of the sliding seat; the tip falls into the concave cavity due to the elastic force of the elastic sheet so that the sliding seat is retained in a predetermined position temporarily.  
     
     
         13 . The armrest of a chair with a cushion as claimed in  claim 9 , wherein the slidable platform is further installed with a limiting means; the limiting means includes a stopper fixed to the retaining seat and a limiting post installed in the sliding seat; by the interaction of the limiting post and the stopper, the sliding seat is prevented from separating with retaining seat.  
     
     
         14 . The armrest of a chair with a cushion as claimed in  claim 13 , wherein the stopper is a protruding element which is installed on the retaining seat facing to the sliding seat; and the limiting post is a stud installed in the sliding seat.