Framework foldable as stepladder or chair

Abstract

A detachable ladder is disclosed that includes a lower frame including two substantially trapezoidal legs, a first board interconnected tops of the legs, and one or more crosspieces interconnected the legs; and an upper frame including two side units each including a substantially trapezoidal upper element having its forward end pivotably secured to a top front end of the leg, and a lower support extended downward from the upper element, a second board interconnected bottoms of the upper elements, a third board interconnected tops of the upper elements, and one or more fourth boards interconnected intermediate portions of the upper elements. Pivoting the upper frame about the lower frame until the tops of the upper elements rest upon a supporting ground will convert the ladder into a chair.

1 . A detachable ladder comprising: 
 a lower frame including two substantially trapezoidal legs, a first board interconnected tops of the legs, and one or more crosspieces interconnected the legs; and    an upper frame including two side units each including a substantially trapezoidal upper element having its forward end pivotably secured to a top front end of the leg, and a lower support extended downward from the upper element, a second board interconnected bottoms of the upper elements, a third board interconnected tops of the upper elements, and one or more fourth boards interconnected intermediate portions of the upper elements;    whereby pivoting the upper frame about the lower frame until the tops of the upper elements rest upon a supporting ground will convert the ladder into a chair.    
   
   
       2 . The detachable ladder of  claim 1 , further comprising an anti-slip shoe formed on each of the tops of the upper elements and front and rear ends of a bottom of each leg.  
   
   
       3 . The detachable ladder of  claim 2 , wherein the upper element further comprises a receptacle vertically extended from the anti-slip shoe on the top thereof.  
   
   
       4 . The detachable ladder of  claim 3 , further comprising a U-shaped bar adapted to have portions of its both ends inserted into the receptacles.  
   
   
       5 . The detachable ladder of  claim 1 , further comprising a footrest interconnected the legs and opposing the one or more crosspieces.  
   
   
       6 . The detachable ladder of  claim 1 , wherein each of the side unit further comprises a substantially inverted T-shaped member secured to the bottom of the upper element and the support such that the substantially inverted T-shaped members are adapted to form as armrests in response to forming the chair.  
   
   
       7 . The detachable ladder of  claim 1 , further comprising a pad having its front end pivotably secured to a rear end of the first board such that the pad is adapted to rest on the first and second boards as a seat by pivoting in response to forming the chair.  
   
   
       8 . The detachable ladder of  claim 1 , further comprising a pad having its rear end pivotably secured to a joining point of the upper element and the support such that the pad is adapted to rest on the first and second boards as a seat by pivoting in response to forming the chair.