Flat folding chair

Abstract

The invention is to a flat folding chair, including a seating frame and cushion fixed on a seating frame, and on front and rear supporting bars which support the two sides of the seating frame. A slide sleeve is installed on the rear supporting bar with the front supporting bar sliding through the slide sleeve to form the movable joint between the supporting bars. A stopper is installed on the front supporting bar. The slide sleeve rests upon the stopper when the folding chair is unfolded to the correct position. There is also a fixation lock installed between the stopper and the slide sleeve to automatically lock the chair when unfolded to the correct position. A clicking sound of the handle snapping into the lock hole serves as a signal to the user that the chair has been opened to the correct position.

I claim: 
     
         1 . A kind of flat folding chair, including a seating frame, cushioning that is fixed on the seating frame, and front and rear supporting bars which support the two sides of the seating frame; the aforementioned rear supporting bars have a slide sleeve installed with the front supporting bar slid through the slide sleeve, forming the movable joint between the front and rear supporting bars. A stopper is installed on the front supporting bar. When the folding chair is unfolded to the correct position, the slide sleeve rests upon the stopper. The feature of this invention is the fixation lock installed between the stopper and the slide sleeve. 
     
     
         2 . Referring to patent  claim 1 , the feature of this flat folding chair, is the fixation lock which includes a lock hole on one side of the stopper or slide sleeve, the handle fixed on one side of the slide sleeve or stopper by a pin, and the helical torsion spring installed on the pin. The helical torsion spring keeps the handle locked into the lock hole. 
     
     
         3 . Referring to patent  claim 1 , the feature of this flat folding chair is the diagonal bars installed at the upper end of the front and rear supporting bars. The aforementioned seating frame is screwed to the diagonal bars on two sides, and is supported by the two diagonal bars. 
     
     
         4 . Referring to patent  claim 1 , the feature of the aforementioned flat folding chair is that the shape of the seating frame can be chosen from the following: circle, ellipse, quadrilateral, triangle, pentagon, hexagon, octagon, trapezium, calabash, or bread-shape which is round at the top and rectangular at the bottom. The seating frame is a closed structure. 
     
     
         5 . Referring to patent  claim 1 , the feature of the aforementioned flat folding chair is that the shape of the seating frame can be chosen from the followings: circle, ellipse, quadrilateral, triangle, pentagon, hexagon, octagon, trapezium, calabash, or bread-shape which is round at the top and rectangular at the bottom. The aforementioned seating frame can be cut open in the front in between the two front supporting bars to make an opening. A horizontal connecting bar can be installed between the two front supporting bars or the two rear supporting bars in the front-facing planes of the chair. 
     
     
         6 . Referring to patent  claim 1 , the feature of the aforementioned flat folding chair is that the cushioning material can be one of the following choices: a uni-body seat and back by Oxford cloth, a flat seat and back structure woven by elastic strings, a flat seat and back structure woven from elastic bands, or a flat seat and back structure composed of elastic strings or elastic bands combined with Oxford cloth. 
     
     
         7 . Referring to patent  claim 1 , the feature of the aforementioned flat folding chair is that there is a spacer in between the contact surface of the slide sleeve and the rear supporting bar. The spacer has a curvature that matches the rear supporting bar, which enables the spacer to remain in close contact with the surface of the rear supporting bar.