Spring hinge base structure

A spring hinge base structure, comprising:

• a body, having a first tube and a first plate portion fixedly connected with the first tube;
• a plurality of locking units, each having a cover and an engagement member which are two separate members integrally connected with each other, a center of each cover comprising a first through hole, one end of each cover comprising a groove, each first through hole positioned inside the respective groove, each engagement member being engaged inside the respective groove and comprising an engagement groove, a first one of the plurality of locking units being connected to an end of the first tube and movable together with the first tube, a second one of the plurality of locking units being located at another end of the first tube and rotatable with respect to the first tube;
• an elastic element, two ends thereof respectively engaged with the respective engagement grooves of the first one and the second one of the plurality of locking units;
• a second plate portion, upper and lower ends of one side thereof respectively projected with a blocking portion, each blocking portion comprising a second through hole;
• and
• a shaft, disposed through one said first through hole and one said second through hole, wherein the second plate portion is integral and rotatably movable together with the second one of the plurality of locking units by a bump component which is adjustably connected to the second one of the plurality of locking units and abutted between the second plate portion and the second one of the plurality of locking units,
• wherein the spring hinge base structure further includes a second elastic element, a third plate portion and a second shaft, the body is integrally formed of one piece and further includes a second tube, the first plate portion is connected between the first tube and the second tube, a third one of the plurality of locking units is connected to an end of the second tube and movable together with the second tube, a fourth one of the plurality of locking units is located at another end of the second tube and rotatable with respect to the second tube, two ends of the second elastic element are respectively engaged with the respective engagement grooves of the third one and the fourth one of the plurality of locking units, the second shaft is disposed through one said first through hole and a respective end of the third plate portion, and the third plate portion is integral and rotatably movable together with the fourth one of the plurality of locking units by a second bump component which is adjustably connected to the fourth one of the plurality of locking units and abutted between the third plate portion and the fourth one of the plurality of locking units,
• wherein the body is formed from a single sheet member, the first plate portion includes a first end plate, an intermediate plate and a second end plate, the first tube integrally extends from a side of the first end plate, the intermediate plate integrally extends between and is connected directly with the first tube and the second tube, the second end plate integrally extends from the second tube, and the intermediate plate fixedly connected with and between the first end plate and the second end plate in a thicknesswise direction of the intermediate plate,
• wherein the first end plate, the intermediate plate and the second end plate have substantially the same width between the first tube and the second tube, and
• wherein the first end plate and the second end plate are parallel to the intermediate plate and respectively stacked on two opposite faces of the intermediate plate in the thicknesswise direction of the intermediate plate.