Modular sofa bed

Abstract

A modular sofa bed, wherein the modular sofa bed comprises: one or more base modules, wherein each of the base modules comprises a hollow base frame and a seat board module detachably set to the hollow base frame; one or more backrest modules, wherein each of the backrest modules is detachably connected to a corresponding one of the base modules; and two handrail modules, detachably set on two outer sides of the base modules, respectively.

What is claimed is: 
     
         1 . A modular sofa bed, wherein the modular sofa bed comprises:
 one or more base modules, wherein each of the base modules comprises a hollow base frame and a seat board module detachably set to the hollow base frame;   one or more backrest modules, wherein each of the backrest modules is detachably connected to a corresponding one of the base modules; and   two handrail modules, detachably set on two outer sides of the base modules, respectively.   
     
     
         2 . The modular sofa bed according to  claim 1 , wherein the seat board modules are set on the hollow base frames by sliding mechanisms;
 wherein the sliding mechanisms comprise sliding rails set on the hollow base frames and wheels set on the seat board modules, wherein the sliding rails and the wheels are configured to be compatible with each other.   
     
     
         3 . The modular sofa bed according to  claim 2 , wherein front ends of the sliding rails and rear ends of the sliding rails are inclined to form suspended ends, wherein the suspended ends are used to secure the seat board modules, wherein middle sections of the sliding rails are horizontally arranged, to enable sliding of the seat board modules. 
     
     
         4 . The modular sofa bed according to  claim 1 , wherein the base modules are coupled to the handrail modules via connecting footboards. 
     
     
         5 . The modular sofa bed according to  claim 4 , wherein the connecting footboards comprise one or more of two-hole connecting footboards, three-hole connecting footboards, and four-hole connecting footboards. 
     
     
         6 . The modular sofa bed according to  claim 1 , wherein the backrest modules are connected to the hollow base frames via knocked-down (K/D) detachable hinges, and the K/D detachable hinges comprise female hinge parts and male hinge parts;
 wherein the female hinge parts are installed on the backrest modules, and wherein the male hinge parts are installed on the hollow base frames;   wherein the female hinge parts are connected to the male hinge parts via a slip-on connection, enabling a folding movement between the backrest modules and the hollow base frames.   
     
     
         7 . The modular sofa bed according to  claim 1 , wherein the handrail modules are connected to the hollow base frames via K/D connecting plates:
 wherein the K/D connecting plates comprise female sliding plug parts, male sliding plug parts, and U-shaped hangers;   wherein the male sliding plug parts are installed on the handrail modules, and the U-shaped hangers are set on the hollow base frames; and   wherein the female sliding plug parts are fastened to the U-shaped hangers, and the handrail modules are detachably connected to the hollow base frames via a slip-on connection between the male sliding plug parts and the female sliding plug parts.   
     
     
         8 . The modular sofa bed according to  claim 1 , wherein the base modules are detachably connected by connecting footboards.