Lawn chair with an inclination adjustable backrest member

Abstract

A lawn chair includes a seat member disposed between left and right leg units, a backrest member extending uprightly from the seat member, and left and right armrest member fastened pivotally to the backrest member at rear portions thereof. Two tension springs are fastened to the armrest members and the leg units for urging the backrest member to a predetermined inclination relative to the seat member. Downward pressure on the backrest member by virtue of body weight of a seated person against tension force of the springs, and a simultaneous upward lifting of the armrest members relative to the leg units result in adjusting the backrest member to a desired inclined position relative to the seat member. Removal of the downward pressure from the backrest member can result in restoration of the backrest member to the predetermined inclination.

I claim:  
     
         1 . A lawn chair comprising: 
 left and right leg units having top portions;    a seat member disposed between and fastened to said left and right leg units to extend in a longitudinal direction in such a manner that said top portions of said left and right units are located at an elevation above said seat member;    a backrest member extending uprightly from said seat member, and having a lower section, an upper section, and an intermediate section between said upper and lower sections;    a pivot unit extending in a transverse direction relative to said longitudinal direction through said lower section of said backrest member and a selected one of said seat member and said left and right leg units to permit folding and unfolding of said backrest member relative to said seat member;    left and right armrest members extending in said longitudinal direction, and having rear parts pivoted to said intermediate section of said backrest member and front parts disposed movably and respectively over said top portions of said left and right leg units in such a manner that folding and unfolding actions of said backrest member relative to said seat member result in movement of said armrest members in said longitudinal direction; and    an inclination adjustment device including 
 left and right elongated teeth members fixed respectively to said armrest members at said front parts and extending along said longitudinal direction, each of said teeth members having engaging grooves that define a frontmost engaging groove, a rearmost engaging groove and a plurality of intermediate engaging grooves between said frontmost and rearmost engaging grooves,  
 left and right tongues mounted fixedly on said top portions of said left and right leg units and selectively engaging one of said engaging grooves, said tongues engaging said rearmost engaging grooves in said teeth members when said backrest member is disposed at a predetermined inclination relative to said seat member, and  
 two tension springs having rear ends fastened said rear parts of said armrest members, and front ends respectively fastened to said tongues under tension, thereby urging said armrest members frontward in said longitudinal direction and consequently disposing said backrest member at said predetermined inclination relative to said seat member;  
   whereby, downward pressure on said backrest member by virtue of body weight of a seated person against action of said tension springs and simultaneous upward lifting of said armrest members relative to said leg units result in movement of said tongues from one of said engaging grooves to another one of engaging grooves, thereby adjusting said backrest member to a desired inclined position; and    whereby, removal of said downward pressure from said backrest member can result in restoration of said backrest member to said predetermined inclination by virtue of restoration force of said tension springs.