Patent ID: 8496289
Filing Date: 2013-07-30
Classification: A47B,A47C,B62B,Y10T

Abstract:
1. A pitman-style foldable frame structure comprising: a foldable panel having a first panel and a second panel, said first panel and said second panel having contacting surfaces at inside ends thereof contacting against each other when said first and second panels are unfolded, said first and second panels having pin connecting ears with inter-aligned and inter-communicating spindle holes on lower side of the contacting surfaces, said first panel and said second panel having a frame pin connecting part on respective outside ends thereof; a central spindle passing through the spindle holes in the pin connecting ears so as to form a revolving spindle when the foldable panel is folded; a pair of lateral frames attached to the respective outside ends of said first and second panels of said foldable panel, each lateral frame of the pair of lateral frames having a pin connecting end and a landing end, wherein the pin connecting end is attachable to said frame pin connecting part, each lateral frame of said pair of lateral frames having a pitman pin connecting part on an inner side thereof between said pin connecting end and said landing end; a pair of oblique connecting rods attached between the pair of lateral frames, wherein relative outside ends of the pair of oblique connecting rods are relatively attached through a pin-joint to the pitman pin connecting parts configured on the pair of lateral frames, said pair of oblique connecting rods having respective inside ends forming an upper-pointed angle and extending to a spacing position under said central spindle, the respective inside ends of the pair of oblique connecting rods having a pin sleeving part attachable to each other through another pin-joint; a control device attached to said pin sleeving part, said control device having a control part and a locking member, said another pin-joint of the relative inside ends of the pair of oblique connecting rods is locked when said locking member is positioned in a preset first position, said another pin joint being released and rotatable around said spindle when said locking member is positioned in a preset second position, the control part controlling and shifting the position of said locking member; a central connecting frame attached between said central spindle and the relative inside ends of the pair of oblique connecting rods, a top end of said central connecting frame having a through hole for the central spindle to pass through, a bottom end of said central connecting frame having an attaching seat attached between the pin sleeving parts on the inside ends of the pair of oblique connecting rods; and a pair of contacting parts formed through a protrusion on two respective sides on a top of said attaching seat of said central connecting frame, a receiving part positioned on the respective inside ends of the pair of oblique connecting rods for the contacting part to contact against such that said central connecting frame is linked between said central spindle and the respective inside ends of the pair of oblique connecting rods in a rigid vertical angle.