Adjustable mattress structure

An adjustable mattress structure which has a mattress body comprising:

• a plurality of hollow bases arranged for development of the length and the width of the mattress body wherein each of the hollow bases has a top surface with openings thereon and an anterior side with another opening, is internally connected through the openings, and comprises several slide seats located on both lateral walls and symmetrically arranged from top to bottom and two sliding grooves at both sides of openings at the top surface;
• a plurality of elastic support units, each of which consists of a first encapsulated elastomer and a second encapsulated elastomer wherein the first encapsulated elastomer (the second encapsulated elastomer) has a top and a bottom, the second encapsulated elastomer is held inside the first encapsulated elastomer and allows the bottom to extend from the bottom of the first encapsulated elastomer, and the first encapsulated elastomer is arranged and fixed on the hollow base's top surface so that the bottom of the second encapsulated elastomer extends into an opening on the hollow base's top surface;
• a spring positioning body with a locating part from which a first elastic fastener and a second elastic fastener at both sides extend wherein the first elastic fastener (the second elastic fastener) is provided with a fastening block at top for development of a fastening space between the first elastic fastener and the second elastic fastener and the spring positioning body further comprises two sliding parts, which protrude from the locating part's bottom, slip into sliding grooves on top surfaces of two adjacent hollow bases, and are fixed beside two openings so that the two adjacent hollow bases are not separated from each other and two adjacent first encapsulated elastomers are positioned in a fastening space in the spring positioning body and securely fixed on top surfaces of hollow bases when the fastening blocks on the first elastic fastener and the second elastic fastener clamp laterals of the adjacent first encapsulated elastomers, respectively;
• and
• a plurality of adjustable positioning boards, each of which penetrates a hollow base through an opening on the hollow base's anterior side and is positioned and held in slide seats at both sides of the hollow base, located below the bottom of the second encapsulated elastomer, and adjustable in height.