Foldable chair frame

Abstract

The present invention is to a type of folding chair, wherein two front and rear support bars, the upper ends of which are hinged onto two diagonal bars; the front and rear support bars connect at the point of a slide housing, which results in the formation of an operational hinged structure. The two front support bars are constructed independently and are reinforced with a horizontal bar assembly on both sides that attaches near the slide housing hinged areas of the front support bars on the upper ends. This structure serves to reinforce the slide housing hinged area and when the two front support bars are fixed firmly to the floor, the chair will not tip over and the user will be able to sit more safely.

I claim: 
     
         1 . A foldable chair frame, including the following:
 Two symmetrical or corresponding front and rear support bars, the upper ends of which are hinged onto two diagonal bars;   The aforementioned front support bar hinge has a slide housing;   The aforementioned rear support bar passes through this slide housing, thereby creating an operational hinge utilizing both the front and rear support bars;   A slide stop is fastened onto the upper portion of the rear support bar. When the chair is unfolded into the open position, the slide housing compresses against the slide stop;   wherein the front support bars on both sides of the frame are independent bars; and   Each front support bar is hinged with a slide housing on the upper ends, and the horizontal bar assembly is positioned to strengthen the support bars on both sides.   
     
     
         2 . The foldable chair frame of  claim 1 , wherein:
 The horizontal bar assembly includes a short U-shaped bar and a curved section that connects to the two ends of the short U-shaped bar and is affixed firmly to the front support bars and is secured firmly to the structure with rivets; and   The horizontal bar assembly also consists of the main horizontal bar and a protective sheath, with the vertical convex portion of the sheath being fitted with a bar casing;   the protective sheath is positioned on the front support bars, and each end of the horizontal bars are inserted into the bar casings of the sheaths on each side, thus forming a connected structure.   
     
     
         3 . The foldable chair frame of  claim 2 , wherein the two curved sections of the short U-shaped bars affix closely to the front or inner sides of the front support bars on both sides, and are riveted together. 
     
     
         4 . The foldable chair frame of  claim 1 , wherein the rear support bars are constructed in the following manner by one single bar curved into a U-shaped bar. 
     
     
         5 . The foldable chair frame of  claim 1 , wherein Independent bars are formed by soldering two ends of a single bar to the rear support bars, thereby connecting into an integrated structure. 
     
     
         6 . The foldable chair frame of  claim 1 , wherein Independent bars are formed by riveting the two curved sections of the short U-shaped bars to the support bars, thereby connecting into an integrated structure. 
     
     
         7 . The foldable chair frame of  claim 1 , wherein The diagonal bars are positioned at an angle of approximately 30-45 degrees; each of these diagonal bars are riveted onto the seat hoop, on which the seat fabric is attached. 
     
     
         8 . The foldable chair frame of  claim 7 , wherein The chair hoop can either be a closed structure or an open structure that opens near the hinged areas of the diagonal bars 
     
     
         9 . The foldable chair frame of  claim 8 , wherein the chair hoop is selected from one of the following shapes: circle, oval, rectangle, triangle, pentagon, hexagon, octagon, trapezoid, gourd, and oblong shapes. 
     
     
         10 . The foldable chair frame of  claim 1 , wherein The diagonal bars are constructed in a wave form shape that starts low in the front and rises to the rear and The diagonal bars are riveted onto the chair hoop, with the wave-shaped portion serving an armrest. 
     
     
         11 . The foldable chair frame of  claim 10 , wherein the front portion of the aforementioned chair hoop has an opening near the hinged areas of the diagonal bars, forming an open structure. 
     
     
         12 . The foldable chair frame of  claim 11 , wherein The chair hoop can be constructed in a shape selected from one of the following shapes: circle, oval, rectangle, triangle, pentagon, hexagon, octagon, trapezoid, gourd, and oblong shapes.