Seat armrest

Abstract

A seat armrest includes a lower sleeve, an upper sleeve, a driving device, and an adjustable armrest piece. The lower sleeve includes a connecting portion, an inner support portion, and a cover. A stopping device is protruded from the shaft hole towards the axis of the shaft hole. The upper sleeve includes an outer support portion, an opening portion, two slide rails, a partition, and a driven device. The driving device includes a directing frame, a slide plate, a first contact end, and a second contact end. The armrest piece includes a lower slide cover, a slide cover and a press button, which has a release position and a lock position that enables the user to release or lock the driven device and the stopping device, in turn to adjust the height between the inner and outer support portions.

What is claimed is: 
     
         1 . A seat armrest, comprising:
 a lower sleeve, including a connecting portion fixed to a seat, an inner support portion extended upwardly from the connecting portion, and a cover detachably installed at the top of the inner support portion and having a shaft hole interconnected with the interior of the inner support portion, and a stopping device protruded from the shaft hole and towards the axis of the shaft hole;   an upper sleeve, including an outer support portion detachably sheathed on an external periphery of the inner support portion, an opening portion disposed around the top of the outer support portion, two side rails disposed at the front and read of an inner periphery of the opening portion, a partition sealing the bottom of the opening portion, and situated at a position lower than the slide rails and having a through hole, and a driven device capable of changing a direction inside the shaft hole, the outer support portion, and the inner support portion;   a driving device, installed at the inner periphery of the opening portion and capable of moving between the slide rails and in an axial direction, and the driving device having a directing frame disposed opposite to the through hole, a slide plate extended from a side of the directing frame and disposed across an interval between the slide rails, a first contact end extended from the slide plate and disposed at an outer periphery of the directing frame for abutting the inner periphery of the opening portion and having at least one upwardly disposed protrusion, and a second contact end disposed opposite to the directing frame and the first contact end, and extended from the slide plate for abutting the inner periphery of the opening portion; and   an armrest piece, including a lower slide cover capable of moving back and forth on the slide rails and being positioned, an upper slide cover installed at a position corresponding to the lower slide cover, and a press button installed between the upper and lower slide covers and linked with the slide plate of the driving device for a user to control the driven device, and the press button having a starting position and an ending position; such that when the press button is retracted to the ending position, the driven device and the stopping device are forced to release from each other and is provided for the user to adjust the height between the inner and outer support portions, and when the press button is returned to the starting position by an elastic force, the driven device and the stopping device are force to latch with each other.   
     
     
         2 . The seat armrest of  claim 1 , wherein the driven device comprises a long shaft portion having a plurality of blocking edges disposed with an interval apart from one another and capable of latching or releasing the stopping device and moving between the shaft hole and the through hole, a stress portion having a cylindrical body protruded from the center of the top of the long shaft portion, and extended outwardly from the cylindrical body and being maintained to contact with the inner periphery of the directing frame, and a block disposed at the bottom of the long shaft portion for preventing the driving device from being separated from the cover. 
     
     
         3 . The seat armrest of  claim 2 , wherein the block and the blocking edges are disposed alternately with one another on the long shaft portion. 
     
     
         4 . The seat armrest of  claim 3 , wherein the slide plate of the driving device includes a groove arranged in the same direction of the slide rails. 
     
     
         5 . The seat armrest of  claim 4 , wherein the press button includes a press portion clamped on a side of the lower slide cover, and a hook portion extended from the press portion to contact with the groove of the slide plate. 
     
     
         6 . The seat armrest of  claim 5 , wherein the lower slide cover includes an opening portion disposed on a side of the lower slide cover for clamping the press portion, and the opening portion including a horizontal entrance for passing the press portion, and a vertical entrance disposed under the horizontal entrance and substantially perpendicular to the horizontal entrance and provided for passing the hook portion. 
     
     
         7 . The seat armrest of  claim 6 , wherein the lower slide cover includes a rail installed at the bottom of the lower slide cover and provided for guiding the slide rails, a penetrating hole disposed adjacent and interconnected to the rail and provided for the hook portion to hook into the groove, and a plurality of recesses disposed with an interval apart from one another along the rail and using the rail as a boundary from the penetrating hole and provided for being abutted by the at least one protrusion. 
     
     
         8 . The seat armrest of  claim 7 , wherein the rail has a starting end provided for the slide rails to enter.