Abstract:
A foldable dual-chair includes a pair of seat frames and a pair of back frame constructed to support a pair of fabric seats thereon respectively wherein a connecting frame is foldably supported between the two seat frames. The connecting frame includes a pair connecting leg posts each having an outer tube frame and an inner tube frame upwardly extended therefrom in a vertical movable manner. So, the connecting leg posts are capably of slidably adjusting their height in such a manner the foldable dual-chair is capable of folding up into a compact unit for easy storage and carriage.

Description:
BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to foldable chair, and more particularly to a foldable dual-chair which is facilitated to be folded into a compact unit for storage and carriage. 
     2. Description of Related Arts 
     Since a conventional foldable chair can be quickly and easily unfolded for use and folded into a compact unit for carriage, a user can carry the foldable chair to everywhere such as campground or beach. However, when two or more person may join together to have an outdoor activity, they must need to bring more foldable chair in order to occupy their own chair. Even though each foldable chair is folded into a compact size, it is difficult for the user to carry two or more foldable chairs at the same time. Thus, the foldable chairs are bulky for storage and transportation especially when the user put them into a limited space of a vehicle&#39;s trunk. 
     Some improved foldable chairs increase their sizes in order to support two people sitting thereon. However, such foldable chairs have their drawbacks. First, the foldable chair may fail to well support the users because of the increase of user&#39;s weight. In order to well support the user, the foldable chair must provide a rigid cross-support structure of the construction tubes that may increase the weight of the foldable chair. Second, more metal tubes are needed to be constructed the foldable chair in order to increase its seat frame section for supporting two persons. However, the foldable chair cannot be folded into a compact unit which is bulky and difficult to carriage. 
     SUMMARY OF THE PRESENT INVENTION 
     A main object of the present invention is to provide a foldable dual-chair, which provides a strong frame structure that can well support two users sitting on the foldable dual-chair. 
     Another object of the present invention is to provide a foldable dual-chair which can be quickly and easily folded into a compact unit for carriage and storage and unfolded for use. 
     Another object of the present invention is to provide a foldable dual-chair, which has a simple construction that every individual is able to fold and unfold the foldable dual-chair in one single motion. 
     Accordingly, in order to accomplish the above objects, the present invention provides a foldable dual-chair, comprising a pair of seat frames and a pair of back frame constructed to support a pair of fabric seats thereon respectively. 
     Each seat frame comprises an inter-side frame leg, an outer-side frame leg, and a construction frame leg foldably supported between the inter-side frame leg and the outer-side frame leg wherein a connecting frame is foldably supported between the two inter-side frame legs. Each of inter-side and outer-side frame legs comprises a front side crossed leg and a rear side crossed leg pivotally connected together where they cross, a front upper frame joint pivotally connected to a top end of the rear side crossed leg, and a front base frame joint pivotally connected to a lower end of the front side crossed leg. 
     The connecting frame comprises a pair of connecting leg posts slidably passing through the two front frame joints of the two inter-side frame legs respectively wherein each connecting leg post comprises an outer tube frame having a lower end connected to the front base frame joint and an inner tube frame coaxially and upwardly extended from the outer tube frame in a slidably movable manner and penetrating through the respective front upper frame joint. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a conventional folding chair. 
     FIG. 2 is a perspective view of a foldable dual-chair according to a preferred embodiment of the present invention. 
     FIG. 3 is a perspective view of a front upper inter-frame joint of the foldable dual-chair according to the above preferred embodiment of the present invention. 
     FIG. 4 is a perspective view of a front lower inter-frame joint of the foldable dual-chair according to the above preferred embodiment of the present invention. 
     FIG. 5 is a perspective view of a connecting frame of the foldable dual-chair according to the above preferred embodiment of the present invention. 
     FIG. 6 is a perspective view of a sliding joint of the connecting frame of the foldable dual-chair according to the above preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIG. 2 of the drawings, a foldable dual-chair  1  according to a preferred embodiment of the present invention is illustrated, which comprises a pair of seat frames  10  and a pair of back frame  30  constructed to support a pair of fabric seats  1 A thereon respectively. 
     Each seat frame  10  comprises an inter-side frame leg  11  and an outer-side frame leg  12 , and a construction frame leg  13  foldably supported between the inter-side frame leg  11  and the outer-side frame leg  12 . Each of the inter-side frame leg  11  and the outer-side frame leg  12  comprises a front side crossed leg  111 ,  121  and a rear side crossed leg  112 ,  122  pivotally connected together where they cross. 
     Each seat frame  10  further comprises a front upper inter-frame joint  21 A pivotally connected to a top end of the rear side crossed leg  112  of the inter-side frame leg  11 , a front upper outer-frame joint  21 B pivotally connected to a top end of the rear side crossed leg  122  of the outer-side frame leg  12 , a front base inter-frame joint  22 A pivotally connected to a lower end of the front side crossed leg  111  of the inter-side frame leg  11 , and a front base outer-frame joint  22 B pivotally connected to a lower end of the front side crossed leg  121  of the outer-side frame leg  12 . Thus, a back upper frame joint  23 A,  23 B is pivotally connected to a top end of the front side frame leg  111 ,  121 , and a back base frame joint  24 A,  24 B is pivotally connected to a lower end of the rear lower frame leg  112 ,  122 . 
     The construction frame leg  13  comprises a pair of front crossed legs  131 ,  132  pivotally connected together where they cross and a pair of rear crossed legs  133 ,  134  pivotally connected together where they cross. Four top ends of the front and rear crossed legs  131 ,  132 ,  133 ,  134  are pivotally connected to the two front upper frame joints  21 A,  21 B and the two rear upper frame joints  23 A,  23 B respectively. Four lower ends of the front and rear crossed legs  131 ,  132 ,  133 ,  134  are pivotally connected to the two front base frame joints  22 A,  22 B and the two rear base frame joints  24 A,  24 B respectively. 
     Each back frame  30  comprises a pair of back frame legs  31 ,  32  slidably penetrating through the two rear upper frame joints  23 A,  23 B of the respective seat frame  10  respectively wherein two lower ends of the two back frame legs  31 ,  32  are respectively extended downwardly to connect to the two rear base frame joint  24 A,  24 B. 
     The foldable dual-chair  1  further comprises a connecting frame  40  foldably supported between the two seat frames  10  wherein the connecting frame  40  is pivotally connected between the two inter-side frame legs  11  of the two seat frames  10  respectively. As, shown in FIG. 5, the connecting frame  40  comprises a pair of connecting leg posts  41  each slidably passing the front upper inter-frame joint  21 A of the inter-side frame leg  11  of each seat frame  10  wherein each connecting leg post  41  comprises an outer tube frame  411  having a lower end connected to the respective front base joint  22 A and an inner tube frame  412  coaxially and upwardly extended from the outer tube frame  411  in a slidably movable manner and slidably passing through the front upper inter-frame joint  21 A, wherein the outer tube frame  411  has a diameter larger than a diameter of the inner tube frame  412  such that the inner tube frame  412  is slidably disposed in the outer tube frame  411  in a vertical movable manner. It is worth to mention that the foldable dual-chair  1  is lengthened when it is in a folded state, so that the inner tube frame  412  are capable of increase the height of the connecting leg posts when the inner tube frames  412  are upwardly extended from the outer tube frames  411  respectively. Thus, the inner tube frame  412  is slidably penetrated through a predetermined position of the fabric seat  1 A, so as to hold the fabric seat  1 A in position when the fabric seat  1 A is stretched out in the unfolded state of the foldable dual-chair  1 . 
     Moreover, a stopper  413  is affixed on a top end of each inner tube frame  412 , which is positioned above the respective front upper inter-frame joint  21 A, for ensuring the respective front upper inter-frame joint  21 A slid along the inner tube frame  412  in a folding process. 
     The foldable dual-chair  1  further comprises a fabric flap  50  foldably supported between two seat frames  10 . The fabric flap  50  has a predetermined size and shape wherein one of the respective back frame legs  31  from each back frame  30  is slidably penetrated through a rear end of the fabric flap  50  and a front end of the fabric flap  50  is affixed to the two stoppers  413  of the connecting leg posts  41  in such a manner the fabric flap  50  is adapted to be horizontally and flatly stretched out when the foldable dual-chair  1  in the unfolded state such that the fabric flap  50  is capable of forming an arm rest between the two seat frames  10 , so as to support the user&#39;s arm when he or she sits on the foldable dual-chair  1 . At least a holder  501  such as cup holder is mounted on the fabric flap  50 . Moreover, a supplementary fabric extension  51  having at least a pocket provided thereon is frontwardly extended from the front end of the fabric flap  50  for storing the user&#39;s accessories. 
     The connecting frame  40  further comprises two pairs of connecting crossed legs  42  foldably supported between the two seat frames  10  wherein each pair of connecting crossed legs  42  pivotally connected with each other to form a “X” structure. The lower pair of connecting crossed legs  421  have two bottom ends pivotally connected to the two front base inter-frame joints  22 A respectively and the upper pair of connecting crossed legs  422  also have two top ends pivotally connected to the two front upper inter-frame joints  21 A respectively, wherein the upper and lower pairs of connecting crossed legs  422 ,  421  are pivotally connected together by a pair of sliding joints  43  which are slidably connected with the connecting leg posts  41  respectively. 
     According to the preferred embodiment, each of the front upper inter-frame joint  21 A has a guiding through hole  211  having a diameter slightly smaller than the respective outer tube frame  411  of the connecting leg post  41  for the inner tube frame  412  of the connecting leg post  41  slidably passing through, as shown in FIG. 3, such that the front upper inter-frame joint  21 A is sat on a top end of the respective outer tube frame  411  when the foldable dual-chair  1  is in an unfolded state. In other words, the length of the outer tube frame  411  is the height of the foldable dual-chair  1  in the unfolded state. Each front upper inter-frame joint  21 A comprises three walls  212  downwardly and perpendicularly extended therefrom for pivotally connecting the rear side frame leg  112 , the front crossed leg  131  of the construction frame leg  13 , and the connecting crossed leg  42  of the connecting frame  40  respectively. 
     As shown in FIG. 4, each front base inter-frame joint  22 A has a circular holder  221  having a diameter slightly larger than the respective outer tube frame  411  of the connecting leg post  41  for securely holding the lower end of the connecting leg posts  41 . Each front base inter-frame  22 A comprises three supporting walls  222  upwardly and perpendicularly extended therefrom for pivotally connecting the front side frame leg  111 , the front crossed leg  131  of the construction frame leg  13 , and the connecting crossed leg  42  of the connecting frame  40  respectively. 
     Referring to FIG. 6, each sliding joint  43  comprises a slider body  431  having a slider hole  431 A which has a diameter slightly larger than the respective connecting leg post  41  and vertically extended through the slider body  431  for the respective connecting leg post  41  slidably passing through. Each sliding joint  43  further comprises a pivotal arm  432  integrally extended from the slider body  431  for pivotally connecting both the upper and lower connecting crossed legs  422 ,  421  together, and an top wall  433  integrally and perpendicularly extended on a top of the pivotal arm  432  so as to limit the rotation angle of the lower pair of connecting crossed legs  421 . 
     It is worth to mention that two pairs of connecting crossed legs  42  is used instead of a pair of connecting crossed legs because the pairs of connecting crossed legs  42  can provide a better rotation angle thereof. Thus, the two pairs of connecting crossed legs  42  are slidably connected with the two connecting leg posts  41  so as to provide better support between the two seat frames  10 . 
     When the foldable dual-chair  1  is folded, each side frame leg  11 ,  12  and the connecting crossed legs  42  will rotate to narrow the cross structure thereof to near vertical position, as the circumference of the foldable dual-chair  1  is reduced and the height is lengthened. So, the two front upper inter-frame joints  21 A are rendered to move upwardly by the seat frames  10 , so as to upwardly slide along the inner tube frame  412  of the connecting leg posts  41  respectively by pushing the stopper  43  upward. When the foldable dual-chair  1  is in unfolded state, the front upper inter-frame joints  21 A are downwardly slid along the two inner tube frame  412  and sat on top ends of the respective outer tube frames  411  of the connecting leg posts  41  respectively for partially supporting the foldable dual-chair  1 . In other words, the inner tube frames  412  will respectively guide the two front upper inter-frame joints  21 A in a vertical movable manner. 
     In order to rigidly support the two seat frame  10  together, as shown in FIG. 2, the connecting frame  40  further comprises two pairs of additional connecting crossed legs  44  foldably supported between the two rear upper frame joints  23 A and the two rear base frame joints  24 A of the inter-side frame leg  11  wherein each pair of additional connecting crossed legs  44  pivotally connected each other to form a “X” structure. The lower pair of additional connecting crossed legs  441  have two bottom ends pivotally connected to the two rear frame joints  24 A respectively and the upper pair of additional connecting crossed legs  442  also have two top ends pivotally connected to the two rear upper frame joints  23 A respectively, wherein the upper and lower pairs of additional connecting crossed legs  442 ,  441  are pivotally connected together by two sliding joints  43  which are slidably connected with the back frame legs  31  of the back frames  30  respectively.