Foldable Supporting Device

Abstract

A foldable supporting device includes first and second supporting frames, first and second movable elements, a first foldable structure, and first and second rotatable elements. The first supporting frame includes a first upper part and a first lower part. The second supporting frame includes a second upper part and a second lower part. The first movable element and the second movable elements are respectively movable along the first lower part and the second lower part. The first foldable structure connects to the first movable element and the second movable element. The first rotatable element is connected to the first supporting frame and the first foldable structure. The second rotatable element is connected to the second supporting frame and the first foldable structure. The first rotatable element and the second rotatable element are respectively rotatable with respect to the first supporting frame and the second supporting frame.

What is claimed is: 
     
         1 . A foldable supporting device, comprising:
 a first supporting frame comprising a first upper part and a first lower part disposed opposite to the first upper part;   a second supporting frame comprising a second upper part and a second lower part disposed opposite to the second upper part;   a first movable element that is movable along the first lower part;   a second movable element that is movable along the second lower part;   a first foldable structure which connects to the first movable element and the second movable element and is foldable from a first extended position to a first folded position so as to change a distance between the first supporting frame and the second supporting frame;   a first rotatable element connected to the first supporting frame and the first foldable structure;   a second rotatable element connected to the second supporting frame and the first foldable structure;   wherein the first rotatable element and the second rotatable element are respectively rotated with respect to the first supporting frame and the second supporting frame when the first foldable structure is folded from the first extended position to the first folded position.   
     
     
         2 . The foldable supporting device as claimed in  claim 1 , wherein:
 the first supporting frame further comprises a first side part connecting the first upper part and the first lower part;   the second supporting frame further comprises a second side part connecting the second upper part and the second lower part;   the first rotatable element is rotatably connected to the first side part and is fixed to the first foldable structure;   the second rotatable element is rotatably connected to the second side part and is fixed to the first foldable structure.   
     
     
         3 . The foldable supporting device as claimed in  claim 1 , wherein:
 the first foldable structure comprises two crossing elements that are rotatable with respect to each other;   the crossing elements comprise a first end rotatably connected to the first movable element, a second end rotatably connected to the second movable element, a third end fixed to the first rotatable element, and a fourth end fixed to the second rotatable element.   
     
     
         4 . The foldable supporting device as claimed in  claim 3 , wherein the first rotatable element has a first hole for receiving the third end of the crossing elements and a second hole for receiving the fourth end of the crossing elements. 
     
     
         5 . The foldable supporting device as claimed in  claim 4 , wherein the first hole and the second hole are extended perpendicular to each other. 
     
     
         6 . The foldable supporting device as claimed in  claim 1 , further comprising:
 a third movable element movable along the second lower part;   a third rotatable element rotatably connected to the first supporting frame;   a connecting member rotatably connected to the third movable element and fixed to the third rotatable element.   
     
     
         7 . The foldable supporting device as claimed in  claim 6 , wherein:
 the first supporting frame further comprises a side part connecting the first upper part and the first lower part;   the third rotatable element is rotatably connected to the side part.   
     
     
         8 . The foldable supporting device as claimed in  claim 1 , further comprising:
 a third supporting frame comprising a third upper part and a third lower part disposed opposite to the third upper part;   a third movable element that is movable along the second lower part;   a fourth movable element that is movable along the third lower part;   a second foldable structure which connects to the third movable element and the fourth movable element and is foldable from a second extended position to a second folded position so as to change a distance between the second supporting frame and the third supporting frame;   a third rotatable element connected to the second supporting frame and the second foldable structure;   a fourth rotatable element connected to the third supporting frame and the second foldable structure;   wherein the third rotatable element and the fourth rotatable element are respectively rotated with respect to the second supporting frame and the third supporting frame when the second foldable structure is folded from the second extended position to the second folded position.   
     
     
         9 . The foldable supporting device as claimed in  claim 1 , further comprising:
 a third movable element that is movable along the first lower part;   a fourth movable element that is movable along the second lower part;   a third rotatable element rotatably connected to the first supporting frame and the first foldable structure;   a fourth rotatable element rotatably connected to the second supporting frame and the first foldable structure;   wherein the first foldable structure comprises two crossing elements that are rotatable with respect to each other;   wherein the crossing elements comprise a first end rotatably connected to the first movable element, a second end rotatably connected to the second movable element, a third end rotatably connected to the third movable unit, and a fourth end rotatably connected to the fourth movable unit.   
     
     
         10 . The foldable supporting device as claimed in  claim 9 , wherein:
 the first rotatable piece is rotatably connected to the first upper part and the crossing elements;   the second rotatable piece is rotatably connected to the second upper part and the crossing elements;   the third rotatable piece is rotatably connected to the first upper part and the crossing elements;   the fourth rotatable piece is rotatably connected to the second upper part and the crossing elements.   
     
     
         11 . The foldable supporting device as claimed in  claim 9 , further comprising a stopper disposed between the first movable element and the third movable element and fixed to the first lower part of the first supporting frame. 
     
     
         12 . The foldable supporting device as claimed in  claim 1 , further comprising:
 a first joint;   a side structure rotatably connected to the first supporting frame through the first joint;   wherein the side structure comprises a connecting rod, a second joint and a leg;   wherein the connecting rod is connected to the first joint;   wherein the connecting rod and the leg are connected through the second joint;   wherein the second joint comprises a channel and a roller disposed in the channel.   
     
     
         13 . An apparatus comprising:
 a foldable supporting device as claimed in  claim 1 ;   a coupling element;   an object fixed to the foldable supporting device through the coupling element;   wherein the coupling element comprising a first portion, a second portion, and a connecting portion connecting the first portion and the second portion;   wherein the first portion is fixed to the object;   wherein the second portion is detachably connected to the foldable supporting device.   
     
     
         14 . The apparatus as claimed in  claim 13 , wherein:
 the object is an inflatable product that comprises a first sheet and a second sheet fused to contain the first portion of the coupling element;   the foldable supporting device further comprises a groove along which the connecting portion is moved when the second portion is connected to the foldable supporting device.   
     
     
         15 . An apparatus comprising:
 a foldable supporting device as claimed in  claim 1 ;   an object supported by the foldable supporting device;   wherein the foldable supporting device further comprises an auxiliary support to support the object;   wherein the auxiliary support comprises a sleeve;   wherein the foldable supporting device further comprises a hook that penetrates through the sleeve.   
     
     
         16 . The apparatus as claimed in  claim 15 , wherein the auxiliary support is a weaving strap. 
     
     
         17 . A foldable supporting device, comprising:
 a plurality of supporting structures comprising upper parts and lower parts disposed opposite to the upper parts;   a foldable structure which is connected to the lower parts of the supporting structures and is foldable from an extended position to a folded position;   a plurality of rotatable elements which connect the supporting structures and the foldable structure;   wherein when the foldable structure is folded, external forces from the lower parts of the supporting structures are transmitted to the upper parts of the supporting structures with the rotatable elements cooperating to rotate, thereby moving the supporting structures close to each other.   
     
     
         18 . The foldable supporting device as claimed in  claim 17 , further comprising movable elements that are connected to the foldable structure and are movable along the lower parts of the supporting structures, wherein a distance between the supporting structures is determined by an extent of extending of the foldable structure and positions of the movable elements. 
     
     
         19 . A foldable supporting device, comprising:
 a plurality of supporting structures comprising upper parts and lower parts disposed opposite to the upper parts;   a foldable structure which is connected to the lower parts of the supporting structures and is foldable from an extended position to a folded position;   a plurality of rotatable elements which connect the supporting structures and the foldable structure;   wherein during extension of the foldable supporting device, external forces from the upper parts of the supporting structures are transmitted to the foldable structure with the rotatable elements cooperating to rotate, thereby extending the foldable structure and moving the supporting structures apart from each other.   
     
     
         20 . The foldable supporting device as claimed in  claim 19 , further comprising movable elements that are connected to the foldable structure and are movable along the lower parts of the supporting structures, wherein a distance between the supporting structures is determined by an extent of extending of the foldable structure and positions of the movable elements.