A pitman-style foldable frame structure has an innovative and unique assembled design. The frame structure includes foldable panels, a central spindle, lateral frames, oblique connecting rods, a control device, and a central connecting frame. The frame structure offers improvement over the prior art
A pitman-style foldable frame structure has an innovative and unique assembled design. The frame structure includes foldable panels, a central spindle, lateral frames, oblique connecting rods, a control device, and a central connecting frame. The frame structure offers improvement over the prior art in lowering the material cost and increasing structural support strength and rigidity of the pitman-style foldable frame and achieves practical advancement and better industrial utilization effect.
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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 secon
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; anda 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. 2. The pitman style foldable frame of claim 1, wherein the pin sleeving parts comprise a pair of inter-communicating concave spaces with stopping parts and a pair of inter-contacting projecting columns in a center of the concave space, the pair of projecting columns having respectively a through hole and a screw hole with a screwing member fixed thereto, the corresponding ends of the pin sleeving parts having reducing projecting pipes contacting against each other, said attaching seat being shaped like a ring and sleeving a periphery of said reducing projecting pipe, the pin sleeving part having a receiving groove, a through hole inter-communicates with the concave space of the pin sleeving part on a portion of an inside wall of the receiving groove; said locking member is of a block shape with a stopping edge and is housed inside the pair of concave spaces in a movable manner, a center of said locking member has a through hole loosely shielding the projecting columns, the control part of said control device having a push button and a return spring, said push button being attached in the receiving groove, an outside end of said push button projecting out of the receiving groove, an inside end of said push button having a projecting elastic clasping pin locked inside the through hole on the inner wall of the receiving groove, said return spring being supported between said locking member and an end wall of the concave space, the relative inside ends of the pair of oblique connecting rods are locked when said locking member is at an intersecting position of the pair of concave spaces, the elastic clasping pin simultaneously extending inside and pushing the locking member to shift to the inside of one concave space when the push button moves under pressure such that the relative inside ends of said pair of oblique connecting rods are released and become rotatable. 3. The pitman-style foldable frame structure of claim 1, wherein said frame pin connecting part is comprised of a pair of spaced projecting columns and a pair of oblique angle attaching slots at the corresponding position of the pin connecting end of the pair of internal frames, said oblique angle attaching slot having a preset opening angle joined with the projecting column. 4. The pitman-style foldable frame structure of claim 1, the pitman pin connecting parts having a pair of spaced projecting axles and a pair of single opening attaching slots on corresponding positions on the outside ends of the pair of oblique connecting rods, the single opening attaching slot having a preset opening angle joined with the projecting axle. 5. The pitman-style foldable frame structure of claim 1, wherein a top surface of the first and second panels of the foldable panel has spaced and distributed concave attaching surfaces arranged in parallel. 6. The pitman-style foldable frame structure of claim 1, wherein the pitman-style foldable frame structure is used as a folding structure of a sled, said sled having a top frame and a sliding frame, a front end of said sliding frame having an upper curving section connecting with said top frame. 7. The pitman-style foldable frame structure of claim 1, wherein the pitman-style foldable frame structure is used as a folding structure of a chair or a table, and wherein the foldable panel of the pitman-style foldable frame acts as a panel part or a panel attaching part of the chair or table, while the two lateral frames of the pitman-style foldable frame act as legs of the chair or table.
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