The utility model provides a novel mute type sofa
bed frame, which comprises a
fixed frame and a movable frame movably installed on the
fixed frame, the
fixed frame is provided with a guide frame, the movable frame is provided with an installation frame, the installation frame is provided with a moving
assembly matched with the guide frame, the moving
assembly comprises a screw rod, a fixed frame and a movable frame, the special screw rod is provided with an external thread connecting part, an
optical axis part and a limiting part, the outer
diameter sizes of the external thread connecting part, the
optical axis part and the limiting part are sequentially increased, the special screw rod structure is designed, and a rotatable nylon sleeve and a roller are arranged on the special screw rod structure, so that mutual contact between
metal pieces can be effectively prevented; the mute effect of the sofa
bed in the use process is obviously improved; meanwhile, the auxiliary holes are formed in the side face of the guide frame, so that the moving
assembly can be rapidly disassembled, assembled and maintained, the problems that an existing structure is difficult to maintain and high in maintenance cost are solved, and the
maintainability and use convenience of the structure are improved.