Connecting structure for elastic units of sofa bed, elastic layer, and sofa bed

Abstract

A connecting structure for a plurality of elastic units of a sofa bed is provided. The sofa bed includes a bed frame, and the bed frame is configured be alternatively changed between a flat state and a backrest state. The bed frame is disposed with a bed board on which the plurality of elastic units are configured to be disposed. A surface of the bed board is disposed with a plurality of fixing members spaced apart from each other and configured to be connected to the plurality of elastic units, and a bottom of at least one of the plurality of elastic units includes a fixing fitting member configured to be matched with a corresponding one of the plurality of fixing members. The fixing fitting member and the corresponding one of the plurality of fixing members form a detachable connection relationship.

What is claimed is: 
     
         1 . A connecting structure for a plurality of elastic units of a sofa bed, wherein:
 the sofa bed comprises a bed frame,   the bed frame is configured be alternatively changed between a flat state and a backrest state,   the bed frame is disposed with a bed board on which the plurality of elastic units are configured to be disposed,   a surface of the bed board is disposed with a plurality of fixing members spaced apart from each other and configured to be connected to the plurality of elastic units,   a bottom of at least one of the plurality of elastic units comprises a fixing fitting member configured to be matched with a corresponding one of the plurality of fixing members, and   the fixing fitting member and the corresponding one of the plurality of fixing members form a detachable connection relationship.   
     
     
         2 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 1 , wherein:
 an upper part of the at least one of the plurality of elastic units is disposed with two first connecting members and two second connecting members,   the two first connecting members and the two second connecting members are disposed in rotational symmetry about an axial direction of the at least one of the plurality of elastic units,   the two first connecting members and the two second connecting members are alternately arranged, and   adjacent two elastic units of the plurality of elastic units are configured to be connected through the two first connecting members of a first one of the adjacent two elastic units being connected to the two second connecting members of a second one of the adjacent two elastic units.   
     
     
         3 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 2 , wherein:
 the two first connecting members and the two second connecting member are configured to be inserted into each other.   
     
     
         4 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 3 , wherein:
 the two first connecting members are insertion blocks, and   the two second connecting members are insertion slots configured to be matched with the two first connecting members.   
     
     
         5 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 4 , wherein:
 a surface of each of the insertion blocks comprises an elastic arm,   a surface of the elastic arm comprises a protrusion,   a side wall of each of the insertion slots comprises an opening configured to be interlocked with the protrusion, and   when the elastic arm is in an initial position, the protrusion is disposed in the opening and is interlocked with the opening in a direction opposite to an insertion direction of the protrusion.   
     
     
         6 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 4 , wherein:
 two sides of each of the insertion blocks are respectively disposed with two elastic arms,   sides of the two elastic arms facing away from a corresponding one of the insertion blocks respectively has two protrusions,   two side walls of each of the insertion slots along a length direction of a corresponding one of the insertion slots respectively comprises two openings configured to be interlocked with the two protrusions, and   when the two elastic arms are in an initial position, the two protrusions are disposed in the two openings and are interlocked with the two openings in a direction opposite to an insertion direction of the corresponding one of the insertion blocks.   
     
     
         7 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 2 , wherein:
 the two first connecting members and the two second connecting members are insertion and rotatable structures.   
     
     
         8 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 7 , wherein:
 the two first connecting members are rotatable blocks extending along a height direction,   the two second connecting members are position-limiting grooves configured to be matched with the rotatable blocks,   each of the rotatable blocks has a first position and a second position relative to a corresponding one of the position-limiting grooves,   when each of the rotatable blocks is in the first position, each of the rotatable blocks and the corresponding one of the position-limiting grooves are configured to be released from an interlocking connection in a direction opposite to a direction in which each of the rotatable blocks is inserted into the corresponding one of the position-limiting grooves, and   when each of the rotatable blocks is in the second position, each of the rotatable blocks and the corresponding one of the position-limiting grooves are interlocked with each other in the direction opposite to the direction in which each of the rotatable blocks is inserted into the corresponding one of the position-limiting grooves.   
     
     
         9 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 8 , wherein:
 the position-limiting grooves are strip-shaped grooves, and   a length of each of the rotatable blocks is less than a length of each of the position-limiting grooves and greater than a width of each of the position-limiting grooves.   
     
     
         10 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 8 , wherein:
 surfaces of the two first connecting members comprise operating members for driving the rotatable blocks to rotate.   
     
     
         11 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 1 , wherein:
 the bed board comprises a plurality of grid-shaped bed board units.   
     
     
         12 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 11 , wherein:
 the plurality of fixing members are I-shaped protrusions extending in a height direction, and   the fixing fitting member is an I-shaped slot.   
     
     
         13 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 1 , wherein:
 each of the plurality of fixing members comprises a fixed tapered upper cover and a fixed tapered lower cover,   the fixed tapered upper cover and the fixed tapered lower cover are respectively disposed on an upper side and a lower side of the bed board in a thickness direction of the bed board,   the fixed tapered lower cover passes through the bed board and is fixedly connected to the fixed tapered upper cover,   the fixed tapered upper cover is tapered, and   the fixing fitting member is a tapered hole.   
     
     
         14 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 13 , wherein:
 the bed board comprises at least one set of two sub-bed boards, and   the two sub-bed boards are connected by one or more hinges, so that the bed board has an unfolded state and a folded state.   
     
     
         15 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 14 , wherein:
 one or more middle legs are provided for supporting the two sub-bed boards,   opposite sides of the two sub-bed boards are each disposed with one or more connecting lugs,   when the bed board is in the unfolded state, two sets of the one or more connecting lugs that respectively belong to the two sub-bed boards are misaligned with each other in a height direction so that connecting holes respectively on the two sets of the one or more connecting lugs are aligned with each other, and   the one or more middle legs have pins passing through the connecting holes to fix the bed board in the unfolded state.   
     
     
         16 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 1 , wherein:
 an upper part of the at least one of the plurality of elastic units is disposed with four first connecting members disposed in rotational symmetry about an axial direction of the at least one of the plurality of elastic units, and   corresponding ones of the four first connecting members on adjacent elastic units of the plurality of elastic units are connected by an intermediate connecting member.   
     
     
         17 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 16 , wherein:
 the intermediate connecting member is configured to be inserted into the corresponding ones of the four first connecting members on the adjacent elastic units of the plurality of elastic units.   
     
     
         18 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 17 , wherein:
 the four first connecting members are insertion slots, and   the intermediate connecting member comprises a connecting belt and two insertion blocks disposed at two ends of the connecting belt.   
     
     
         19 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 16 , wherein:
 the intermediate connecting member and the corresponding ones of the four first connecting members on the adjacent elastic units of the plurality of elastic units are connected by an insertion and rotatable connection.   
     
     
         20 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 19 , wherein:
 the corresponding ones of the four first connecting members on the adjacent elastic units are arc-shaped slots extending along a rotation direction of the intermediate connecting member,   the intermediate connecting member comprises first parts disposed in the arc-shaped slots and second parts passing through the arc-shaped slots,   a diameter of a first end of each of the arc-shaped slots is larger than a diameter of each of the second parts,   a diameter of a second end of each of the arc-shaped slots is smaller than the diameter of each of the second parts,   when the second parts are rotated to correspond to the first ends of the arc-shaped slots, a connection between the intermediate connecting member and the the corresponding ones of the four first connecting members on the adjacent elastic units is released, and   when the second parts are rotated to correspond to the second ends of the arc-shaped slots, the intermediate connecting member and the corresponding ones of the four first connecting members on the adjacent elastic units are interlocked with each other in a direction opposite to a direction in which the intermediate connecting is inserted into the corresponding ones of the four first connecting members on the adjacent elastic units.   
     
     
         21 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 20 , wherein:
 a surface of the intermediate connecting member comprises an operating member for driving the intermediate connecting member to rotate.   
     
     
         22 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 1 , wherein:
 an upper part of the at least one of the plurality of elastic units is disposed with four first connecting members disposed in rotational symmetry about an axial direction of the at least one of the plurality of elastic units, and   corresponding ones of the four first connecting members on adjacent elastic units of the plurality of elastic units are configured to be connected to each other.   
     
     
         23 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 22 , wherein:
 each of the four first connecting members comprises an inserting portion and an inserted portion which extend along a circumferential direction of a corresponding one of the plurality of elastic units, and   the inserting portion and the inserted portion that respectively belong to adjacent two elastic units of the plurality of elastic units are configured to be inserted into each other.   
     
     
         24 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 23 , wherein:
 the inserting portion comprises an elastic arm and a positioning buckling point disposed on the elastic arm, and   the inserted portion comprises a positioning groove configured to be matched with the positioning buckling point.   
     
     
         25 . The connecting structure for the plurality of elastic units of the sofa bed according to  claim 24 , wherein:
 the inserted portion comprises a position-providing opening in which the elastic arm is configured to swing, and   the elastic arm is configured to swing along a direction toward the position-providing opening due to an external force, so that the positioning buckling point is configured to be separated from the positioning groove.   
     
     
         26 . An elastic layer of a sofa bed, wherein:
 adjacent elastic units of the plurality of elastic units are configured to be connected through the connecting structure according to  claim 1 , one of:
 wherein:
 an upper part of the at least one of the plurality of elastic units is disposed with two first connecting members and two second connecting members, 
 the two first connecting members and the two second connecting members are disposed in rotational symmetry about an axial direction of the at least one of the plurality of elastic units, 
 the two first connecting members and the two second connecting members are alternately arranged, and 
 adjacent two elastic units of the plurality of elastic units are configured to be connected through the two first connecting members of a first one of the adjacent two elastic units being connected to the two second connecting members of a second one of the adjacent two elastic units; 
 
 wherein:
 the upper part of the at least one of the plurality of elastic units is disposed with four first connecting members disposed in rotational symmetry about the axial direction of the at least one of the plurality of elastic units, and 
 corresponding ones of the four first connecting members on adjacent elastic units of the plurality of elastic units are connected by an intermediate connecting member; or 
 
 wherein:
 the upper part of the at least one of the plurality of elastic units is disposed with four first connecting members disposed in rotational symmetry about the axial direction of the at least one of the plurality of elastic units, and 
 corresponding ones of the four first connecting members on adjacent elastic units of the plurality of elastic units are configured to be connected to each other, and 
 
   the plurality of elastic units are arranged in array.   
     
     
         27 . A sofa bed, comprising:
 a structural frame,   a cushion layer, and   the elastic layer according to claim  26 , wherein:
 the cushion layer is fixedly connected to the elastic layer, or 
 the cushion layer is fixedly connected to the structural frame.