Armrest adjusting device

Abstract

An armrest adjusting device for adjusting armrest of chairs includes a hollow armrest seat and a guide plate is fixedly inserted into the armrest seat. A movable member is movably received in the armrest and includes a push end which includes tapered surfaces to control two rods to be removably engaged with click notches in the vertical portion of the elevator part which is connected to the seat of the chair. The vertical portion is inserted in the armrest seat. The movable member is operated via an opening defined through a wall of the armrest seat which is moved with the movable member. The armrest seat does not need to make large holes so as to increase the structural strength and the armrest adjusting device can also be used with tubular elevator part.

1 . An armrest adjusting device comprising:
 a hollow armrest seat having an opening defined in a first sidewall and a recessed area defined in a second sidewall of the armrest seat, an elongate slot defined through an inside of the recessed area, a connection top connected on a top of the armrest seat;   an elevator part having a horizontal portion and a vertical portion which is inserted into the armrest seat from an underside of the armrest seat, at least one elevation slot defined in the vertical portion of the elevator part and a plurality of click notches defined in two insides of the at least one elevation slot;   a guide plate received in the armrest seat and including a top plate which is fixed to the connection top of the armrest seat, a body extending from an underside of the top plate and including an elongate slot, the elongate slot communicating with a narrowed space which is in communication with a restriction slot, the narrowed space and the restriction slot located corresponding to the at least one elevation slot and the click notches of the elevator part;   a movable member movably received in the armrest seat and including an elongate plate and a push end which extends from a lower end of the elongate plate, the elongate plate being slidable along the guide plate and the push end including a block extending laterally therefrom, the block located in the narrowed space of the guide plate and including two tapered surfaces and two parallel push surfaces which are located above the two tapered surfaces, an operation unit connected to the elongate plate so as to control movement of the movable member in the armrest seat, and   two rods located between two sides of the block of the push end and restricted in the restriction slot, the two rods engaged with two of click notches in the two insides of the at least one elevation slot.   
   
   
       2 . The device as claimed in  claim 1 , wherein the guide plate is located between the vertical portion of the elevator part and the second sidewall of the armrest seat, two guide ridges extend from a side of the body of the guide plate and the other side of the body contacts the vertical portion of the elevator part, the operation unit includes a recess defined in a first side of the elongate plate and the recess is defined by a recessed portion protruding from a second side of the elongate plate, an operation flange extends from the first side of the elongate plate and is located at a periphery of the recess, the recessed portion on the second side of the elongate plate is movably accommodated in the opening of the armrest seat, a spring is connected between a first protrusion extending from a top of the recessed portion and a second protrusion extending from an underside of the top plate of the guide plate, the second side of the elongate plate is movable along the two guide ridges on the body of the guide plate, each of the two rods includes an enlarged head which are stopped by elongate slot, a cover is engaged with the recessed area of the armrest seat and includes a rib extending from an inner side thereof, the rib contacts against the enlarged heads of the rods. 
   
   
       3 . The device as claimed in  claim 1 , wherein elevator part is a hollow tube and includes the horizontal portion and the vertical portion, two elevation slots are defined through two sidewalls of the vertical portion respectively and each elevation slot includes click notches defined in the two insides thereof, the body of the guide plate is received in the vertical portion of the elevator part and a guide ridge is located in the elongate slot in the body, the elongate plate of the movable member slidably contacts the guide ridge and the operation unit includes a connection portion connected to the elongate plate with a gap defined between the connection portion and the elongate plate, the connection portion extends through the opening of the armrest seat and is connected with the operation flange, a spring is connected between a first protrusion extending from a top of the push end and a second protrusion extending from an underside of the guide ridge of the guide plate.