Futon bed

Abstract

A futon bed includes two bed boards. The two bed boards are divided into a mattress and a backrest cushion. Each of the two bed boards includes a bed board frame, a plurality of elastic units, and one or more buckling members. An upper cover and a base of each of the plurality of elastic units respectively comprise a locking member and a locking matching member. Each of the one or more buckling members includes one or more releasing portions each of which has an insertion position and a separate position. At the insertion position, the locking member is fixed in a locking position. At the separate position, the locking member is separated from the locking position. The backrest cushion can be in a horizontal state to define a second mattress, and the backrest cushion can be in a vertical state to enable the futon bed to be a sofa.

What is claimed is: 
     
         1 . A futon bed, comprising:
 two bed boards,   a soft cushion, and   a surrounding edge, wherein:
 the two bed boards are divided into a mattress and a backrest cushion, 
 each of the two bed boards comprises a bed board frame, a plurality of elastic units arranged in an array on the bed board frame, and one or more buckling members enabling the plurality of elastic units to be fixed in a compressed state, 
 each of the plurality of elastic units comprises an elastic support frame and a spring, 
 the elastic support frame comprises an upper cover, a base, and a plurality of straps, 
 two ends of each of the plurality of straps are respectively connected to outer sides of the upper cover and the base, 
 the spring is arranged between the upper cover and the base and inside of the plurality of straps, 
 a side of the upper cover and a side of the base facing each other are respectively provided with a locking member and a locking matching member, 
 each of the one or more buckling members comprises one or more releasing portions configured to cooperate with the upper covers of the plurality of elastic units, 
 each of the one or more releasing portions has an insertion position and a separate position relative to the upper cover of a corresponding one of the plurality of elastic units, 
 when each of the one or more releasing portions is located at the insertion position:
 the locking member is fixed in a locking position at which the locking member is interlocked with the locking matching member, and 
 the corresponding one of the plurality of elastic units is in the compression state, 
 
 when each of the one or more releasing portions is located at the separate position, the locking member is separated from the locking position at which the locking member is interlocked with the locking matching member, 
 the backrest cushion is configured to be rotated to be in a horizontal state to define a second mattress, and 
 the backrest cushion is configured to be rotated to be in a vertical state to enable the futon bed to be a sofa. 
   
     
     
         2 . The futon bed according to  claim 1 , wherein:
 the locking member is an expandable sleeve,   the locking matching member is a position-limiting sleeve,   an outer wall of the expandable sleeve extends radially outward to form a first position-limiting surface,   an outer diameter of the first position-limiting surface of the expandable sleeve in a non-expanded state is smaller than an inner diameter of an opening of the position-limiting sleeve, and   the outer diameter of the first position-limiting surface of the expandable sleeve in an expanded state is larger than the inner diameter of the opening of the position-limiting sleeve.   
     
     
         3 . The futon bed according to  claim 2 , wherein:
 each of the one or more releasing portions is a plug,   the expandable sleeve comprises a through channel along a height direction of the corresponding one of the plurality of elastic units, and   the plug is in interference fit with the through channel to change the expandable sleeve from the non-expanded state to the expanded state.   
     
     
         4 . The futon bed according to  claim 3 , wherein:
 an inner wall of the expandable sleeve extends radially inward to form a second position-limiting surface,   an outer wall of the plug extends radially outward to form a third position-limiting surface, and   when the plug is in the insertion position, the second position-limiting surface and the third position-limiting surface are interlocked with each other along an insertion direction.   
     
     
         5 . The futon bed according to  claim 4 , wherein:
 the plug is connected to the base via a stabilizing rope, and   the stabilizing rope passes through the through channel.   
     
     
         6 . The futon bed according to  claim 1 , wherein:
 each of the one or more buckling members comprises an operating portion connected to one of the one or more releasing portions, and   the one of the one or more releasing portions is configured to be driven to move from the insertion position to the separate position by applying an external force to the operating portion.   
     
     
         7 . The futon bed according to  claim 6 , wherein:
 the operating portion is a pull ring.   
     
     
         8 . The futon bed according to  claim 1 , wherein:
 the plurality of elastic units are divided into at least one group of elastic units,   elastic units in each group of the at least one group of elastic units are connected together through a same one of the one or more buckling members,   each of the one or more buckling members comprises one or more connecting portions connected to two adjacent releasing portions of the one or more releasing portions, and   the one or more connecting portions are configured to drive adjacent elastic units in each group of the at least one group of elastic units to be released one by one due to an elastic reset force generated by one of the elastic units being changed from the compressed state to a released state.   
     
     
         9 . The futon bed according to  claim 1 , wherein:
 the plurality of elastic units are divided into two groups of elastic units to form a gap between the two groups of elastic units for a corresponding one of the two bed boards to be folded, and   the two groups of elastic units are arranged along a length direction of the bed board frame.   
     
     
         10 . The futon bed according to  claim 1 , wherein:
 the bed board frame comprises an outer frame and a plurality of support rods arranged at intervals along a length direction of the outer frame,   the plurality of elastic units are arranged in an array on the plurality of support rods, and   the plurality of support rods pass through the plurality of elastic units.   
     
     
         11 . The futon bed according to  claim 1 , wherein:
 a surrounding edge is arranged on the bed board frame along a circumferential direction, and   the surrounding edge and the soft cushion are disposed with a connecting member for connecting the surrounding edge and the soft cushion to each other.   
     
     
         12 . The futon bed according to  claim 11 , wherein:
 the connecting member is a zipper.   
     
     
         13 . The futon bed according to  claim 1 , comprising:
 a left armrest,   a right armrest facing the left armrest, and   a connecting support assembly connected between the left armrest and the right armrest.   
     
     
         14 . The futon bed according to  claim 13 , wherein:
 the left armrest and the right armrest each comprises two support feet as well as a first lateral rod and a second lateral rod which are connected between the two support feet,   the second lateral rod is located below the first lateral rod, and   the second lateral rod is provided with a support member for supporting the bed board frame.   
     
     
         15 . The futon bed according to  claim 14 , wherein:
 the support member comprises a first buckling groove buckled to the second lateral rod and a second buckling groove buckled to the bed board frame, and   openings of the first buckling groove and the second buckling groove face opposite directions.   
     
     
         16 . The futon bed according to  claim 14 , wherein:
 the connecting support assembly comprises a side support rod and a middle support rod,   the side support rod is detachably connected to the left armrest and the right armrest,   the middle support rod extends in a direction parallel to the left armrest or the right armrest, and   one end of the middle support rod is detachably connected to the side support rod.   
     
     
         17 . The futon bed according to  claim 16 , wherein:
 the side support rod comprises a connecting seat and two connecting rods, and   a first end of each of the two connecting rods is rotatably connected to the connecting seat, so that each of the two connecting rods has an unfolded position and a folded position relative to the connecting seat.   
     
     
         18 . The futon bed according to  claim 17 , wherein:
 a second end of each of the two connecting rods has a socket that is detachably connected to one of the two support feet.   
     
     
         19 . The futon bed according to  claim 18 , wherein:
 a side wall of the socket comprises an L-shaped position-limiting groove,   one end of the L-shaped position-limiting groove is connected to an upper end surface of the socket, and   the one of the two support feet is provided with a position-limit block for being placed in the L-shaped position-limiting groove.   
     
     
         20 . The futon bed according to  claim 17 , wherein:
 the connecting seat comprises a horizontal seat body and a vertical seat body arranged perpendicular to the horizontal seat body,   the horizontal seat body is configured to be rotatably connected to the two connecting rods, and   the vertical seat body is configured to form a detachable connection with the middle support rod.   
     
     
         21 . The futon bed according to  claim 20 , wherein:
 the middle support rod comprises a middle support rod body and a plurality of middle support feet,   the middle support rod body is detachably connected to the vertical seat body, and   the plurality of middle support feet are arranged at intervals along a length direction of the middle support rod body.   
     
     
         22 . The futon bed according to  claim 21 , wherein:
 the vertical seat body comprises at least one connecting port along a height direction,   one end of the middle support rod body is provided with an L-shaped rib configured to be matched with the at least one connecting port, and   one end of the L-shaped rib is connected to the middle support rod body to form a buckling groove located between the L-shaped rib and the middle support rod body and having a downward opening.   
     
     
         23 . The futon bed according to  claim 13 , wherein:
 the soft cushion comprises a backrest portion corresponding to the backrest cushion and a seat cushion portion corresponding to the mattress,   the surrounding edge comprises a first surrounding edge portion and a second surrounding edge portion,   the first surrounding edge portion is in a semi-enclosed shape,   the second surrounding edge portion is connected to an opening of the semi-enclosed shape, and   a connecting member is arranged on the first surrounding edge portion and an area of the soft cushion corresponding to the first surrounding edge portion.   
     
     
         24 . The futon bed according to  claim 23 , wherein:
 the left armrest and the right armrest are detachably rotatably connected to the backrest cushion respectively through a first folding hinge and a second folding hinge.   
     
     
         25 . The futon bed according to  claim 24 , wherein:
 the first folding hinge and the second folding hinge each comprises a first arm and a second arm,   a first end of the first arm is pivotally connected to a first end of the second arm,   a second end of the first arm is fixedly connected to the left armrest or the right armrest, and   a second end of the second arm is detachably connected to the backrest cushion.   
     
     
         26 . The futon bed according to  claim 25 , wherein:
 the second end of the second arm comprises an insertion groove that is buckled to the bed board frame of the backrest cushion.   
     
     
         27 . The futon bed according to  claim 13 , wherein:
 an area of the soft cushion corresponds to a sum of upper surface areas of the two bed boards,   the surrounding edge comprises a first surrounding edge portion and a second surrounding edge portion,   the first surrounding edge portion is in a semi-enclosed shape,   the second surrounding edge portion is connected to an opening of the semi-enclosed shape, and   a connecting member is arranged on the first surrounding edge portion and a circumference of the soft cushion.   
     
     
         28 . The futon bed according to  claim 1 , wherein:
 a surrounding edge is arranged on the bed board frame along a circumferential direction, and   the plurality of elastic units are divided into two groups of elastic units to form a gap between the two groups of elastic units for a corresponding one of the two bed boards to be folded, and   when the corresponding one of the two bed boards is folded, the bed board frame is folded to enable the surrounding edge to be bent.