Connecting Structure for Elastic Units of Sofa Bed, Elastic Layer, and Sofa Bed

This application claims priority to Chinese patent application number 202410403696.6, filed on Apr. 3, 2024, and Chinese patent application number 202510070531.6, filed on Jan. 16, 2025. Chinese patent application number 202410403696.6 and Chinese patent application number 202510070531.6 are incorporated herein by reference.

The present disclosure relates to furniture, and more particularly to a sofa bed.

As living standards gradually improve, residents' demands for furniture products have become increasingly diversified. Among these, sofa beds have emerged as a popular furniture product. Existing sofa beds suffer from several drawbacks. For example, transitions between the two states (sofa and bed) of conventional sofa beds are not smooth, making it difficult for users with limited strength to operate independently, the sofa configuration of existing sofa beds may lack stability, as the angle between the seat and backrest may shift, compromising comfort, and furthermore, the folding mechanisms of current foldable beds are relatively simplistic and fail to meet diverse user needs.

Even if the aforementioned issues were resolved, current sofa beds still exhibit shortcomings in detailed design. For instance, cushions and elastic layers tend to shift relative to each other during use, the base support structure cannot adequately support both the sofa-configuration frame and bed-configuration frame, the mounting method between the bed frame and bed panels in the main frame is suboptimal, disassembly and folding of sofa bed components remain unachievable, and, where spring modules are employed, their installation methods are often structurally unsound.

The primary technical problem addressed by the present disclosure is to provide a connecting structure for a plurality of elastic units of a sofa bed, facilitating secure attachment of the plurality of elastic units to a bed board while ensuring stability of an elastic layer when the sofa bed is folded into a sofa configuration, and enabling easy removal and replacement of the plurality of elastic units from the bed board.

In order to solve the above technical problems, the present disclosure provides a connecting structure for a plurality of elastic units of a sofa bed. The sofa bed comprises 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 comprises 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.

In a preferred embodiment, 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, and 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.

In a preferred embodiment, the two first connecting members and the two second connecting member are configured to be inserted into each other.

In a preferred embodiment, 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.

In a preferred embodiment, a surface of each of the insertion blocks comprises an elastic arm, and 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.

In a preferred embodiment, two sides of each of the insertion blocks are respectively disposed with two elastic arms, and 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. 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.

In a preferred embodiment, the two first connecting members and the two second connecting members are insertion and rotatable structures.

In a preferred embodiment, the two first connecting members are rotatable blocks extending along a height direction, and 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. 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.

In a preferred embodiment, 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.

In a preferred embodiment, surfaces of the two first connecting members comprise operating members for driving the rotatable blocks to rotate.

In a preferred embodiment, the bed board comprises a plurality of grid-shaped bed board units.

In a preferred embodiment, the plurality of fixing members are I-shaped protrusions extending in a height direction, and the fixing fitting member is an I-shaped slot.

In a preferred embodiment, each of the plurality of fixing members comprises a fixed tapered upper cover and a fixed tapered lower cover, and 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.

In a preferred embodiment, 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.

In a preferred embodiment, one or more middle legs are provided for supporting the two sub-bed boards, and 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. The one or more middle legs have pins passing through the connecting holes to fix the first bed board in the unfolded state.

In a preferred embodiment, 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.

In a preferred embodiment, the intermediate connecting member is configured to be inserted into the corresponding ones of the four first connecting members on the adjacent elastic units.

In a preferred embodiment, 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.

In a preferred embodiment, the intermediate connecting member and the corresponding ones of the four first connecting members on the adjacent elastic units are connected by an insertion and rotatable connection.

In a preferred embodiment, 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, and 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, and 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 corresponding ones of the four first connecting members on the adjacent elastic units is released. 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.

In a preferred embodiment, a surface of the intermediate connecting member comprises an operating member for driving the intermediate connecting member to rotate.

In a preferred embodiment, the bed board comprises a plurality of grid-shaped bed board units.

In a preferred embodiment, the plurality of fixing members are I-shaped protrusions extending in a height direction, and the fixing fitting member is an I-shaped slot.

In a preferred embodiment, each of the plurality of fixing members comprises a fixed tapered upper cover and a fixed tapered lower cover, and 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.

In a preferred embodiment, 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.

In a preferred embodiment, one or more middle legs are provided for supporting the two sub-bed boards, and 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. The one or more middle legs have pins passing through the connecting holes to fix the bed board in the unfolded state.

In a preferred embodiment, 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.

In a preferred embodiment, 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.

In a preferred embodiment, 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.

In a preferred embodiment, 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.

In a preferred embodiment, the bed board comprises a plurality of grid-shaped bed board units.

In a preferred embodiment, the plurality of fixing members are I-shaped protrusions extending in a height direction, and the fixing fitting member is an I-shaped slot.

In a preferred embodiment, each of the plurality of fixing members comprises a fixed tapered upper cover and a fixed tapered lower cover, and 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.

The present disclosure provides an elastic layer of a sofa bed. Adjacent elastic units of the plurality of elastic units are configured to be connected through the connecting structure, and the plurality of elastic units are arranged in array.

The present disclosure provides a sofa bed, and the sofa bed comprises a structural frame, a cushion layer, and the elastic layer. The cushion layer is fixedly connected to the elastic layer, or the cushion layer is fixedly connected to the structural frame.

In a preferred embodiment, the structural frame comprises a left armrest, a right armrest, the bed frame, and the bed board, the bed frame comprises a first bed frame and a second bed frame arranged in sequence along a width direction of the left armrest and the right armrest. The first bed frame is fixedly connected to the left armrest and the right armrest, and the second bed frame is rotatably connected to the left armrest and the right armrest. The bed board is respectively connected to the first bed frame and the second bed frame.

In a preferred embodiment, the second bed frame is configured to be in a first position and a second position relative to the first bed frame. When the second bed frame is in the first position, an angle between the first bed frame and the second bed frame is 180°. When the second bed frame is in the second position, the angle between the first bed frame and the second bed frame is less than 180°.

In a preferred embodiment, each of the left armrest and the right armrest is disposed with a folding hinge to enable the left armrest and the right armrest to be rotatably connected to the second bed frame. The folding hinge comprises a first supporting arm and a second supporting arm, and a first end of the first supporting arm and a first end of the second supporting arm are pivotally connected to each other. A second end of the first supporting arm is fixedly connected to a corresponding one of the left armrest or the right armrest, and a second end of the second supporting arm is fixedly connected to the second bed frame.

In a preferred embodiment, the bed board is divided into a first bed board connected to the first bed frame and a second bed board connected to the second bed frame.

In a preferred embodiment, each of the left armrest and the right armrest extends in a direction in which the left armrest and the right armrest face each other to form a supporting rod for supporting the first bed frame. The supporting rod comprises a first connecting groove, and the first bed frame comprises one or more first connecting columns configured to be matched with the first connecting grooves.

In a preferred embodiment, the first connecting groove is divided into a first portion and a second portion which are in communication with each other, and a distal end of each of the one or more first connecting columns radially extends outward to form a flange. A diameter of the first portion is larger than the flange, and a diameter of the second portion is smaller than the flange.

In a preferred embodiment, the first bed frame and the second bed frame are connected to the first bed board and the second bed board by screws respectively.

In a preferred embodiment, an end of the second supporting arm away from the first supporting arm extends to form a supporting surface for supporting the second bed board, and the supporting surface comprises a second connecting groove. The second bed frame comprises one or more second connecting columns configured to be matched with the second connecting grooves.

In a preferred embodiment, the second connecting groove is divided into a first portion and a second portion which are in communication with each other, and a distal end of each of the one or more second connecting columns radially extends outward to form a flange. A diameter of the first portion is larger than the flange, and a diameter of the second portion is smaller than the flange.

In a preferred embodiment, the bed board comprises a third bed board connected to the first bed board, and the third bed board is connected to a side of the first bed board adjacent to the second bed board. The third bed board is arranged at an obtuse angle relative to the first bed board, and a distal end of the third bed board is connected to a first group of the plurality of elastic units on the first bed board adjacent to the second bed board.