Patent ID: 7201449
Filing Date: 2007-04-10
Classification: A47C

Abstract:
1. An adjustable armrest comprising: an elevation device having a hollow column with two openings respectively defined in two opposite ends of the column, a substantially L-shaped support and a first moving portion, wherein the column has a first cutout defined in a top peripheral edge thereof to communicate with one of the two openings, two tracks respectively defined in two opposite sides of the column, threaded holes formed on a top face of the column and through holes each adjacent to one of the threaded holes, the support is substantially L shaped and is divided into a vertical portion adapted to connect to an armrest and a horizontal portion adapted to connect to a seat of a chair, the vertical portion is defined with multiple apertures and slits each sandwiched between two adjacent apertures to communicate the two adjacent apertures, the first moving portion is connected to a plate having a protrusion formed on a side face of the plate to correspond to one of the slits and provided with two wings respectively extending from two opposite sides of the protrusion to correspond to one of the apertures, the plate is pivotally connected to a fixing seat defining therethrough a long hole and holes to correspond to the threaded holes of the column, the fixing seat has two ears extending from a bottom face of the fixing seat and respectively having an axle hole aligned with each other to allow an axle to extend through the axle holes, a first spring located between the two ears and into a side face of the plate so as to allow the fixing seat to be pivotable relative to the plate, the plate is abutted against the vertical portion of the support to allow the two wings to be received in a corresponding one of the apertures, such that after the fixing seat is securely mounted on top of the column via screws threadingly extending through the holes of the fixing seat and into the threaded holes of the column, then combination of the plate and the support are inserted into the column to allow the first spring to abut an inner face of the column, whereby movement of the first moving portion, the two wings are able to escape from the corresponding aperture, yet the protrusion is still received in the corresponding slit and then movement of the column relative to the support is able to adjust a height of the armrest, a first rocking device having a base and a moving plate, wherein the base has multiple laterally formed ribs, multiple recesses defined in one of the ribs, multiple screw holes and multiple laterally extending slits defining through the base, the moving plate is configured to be received in the base and has a concave defined in a bottom face of the moving plate to sequentially receive therein an elastomer and a pin to be selectively received in a corresponding one of the recesses, a centrally formed boss and two protrusions each oppositely formed relative to one another, a substantially slender rocking plate attached to a top face of the moving plate and having a central hole defined to correspond to the boss of the moving plate, two securing holes each defined in a position opposite to each other, a sleeve extending from a bottom face defining the respective securing hole, and two second wings respectively and oppositely formed relative to each other such that when the base and the moving plate are assembled, the boss of the moving plate is received in the central hole of the rocking plate and the sleeves are extended through the slits of the base, the rocking plate is secured to the base via screws which extend into the threaded holes of the column such that the moving plate is securely sandwiched between the base and the rocking plate and when the base is moved, due to the moving plate being immovable, the movement of the base will cause the rib to force the pin to compress the elastomer until the pin is received in a different recess, and a recovery force from the elastomer will position the pin in a different corresponding one of the recesses and purpose of adjusting the base is achieved, and movement of the base causes the protrusion of the moving plate to move among the grooves of each of the wings of the rocking plate so that positioning effect of the movement of the base is accomplished, and a movement controlling device having a substrate and an elastic board secured to the base, wherein the substrate is movable relative to the elastic board and provided with multiple indents and multiple elongated slots, the elastic board has a head formed on a bottom face of the elastic board to be selectively received in a corresponding one of indents of the substrate and multiple holes, such that movement of the substrate is able to allow the head to be received in a different corresponding one of the indents to position the substrate and the armrest cover.