BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a schematic view of an installing position of the present invention;
FIG. 1B is a schematic enlarged view of an assembly of the present invention;
FIG. 2A is an exploded view of a structure of the present invention;
FIG. 2B is another exploded view of a structure of the present invention;
FIG. 3 is a perspective view of a structure of the present invention;
FIG. 4 is a schematic view of opening a door plank of the present invention;
FIG. 5 is a schematic view of a closing movement of the present invention; and
FIG. 6 is a schematic view of closing a door plank of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawing.
Referring to FIGS. 1A, 1B and 2A for the detailed description of the present invention, a door hinge structure of the invention comprises a turning body 4 and a fixing body 3 respectively installed at upper and lower lateral positions of a door plank 1 and a door frame 2, and the turning body 4 and the fixing body 3 are pivotally coupled by an axial bolt 5. Two protrusions 31 on the fixing body 3 separately have a hollow penetrating hole 32, and the protrusion 31 has a parallel transversal screw thread hole 33 penetrated into an inner edge of the penetrating hole 32 for an interconnection. A protrusion 41 on the turning body 4 has a vertical hollow penetrating hole 42, and the turning body 4 has a plurality of transversal screw holes 43 disposed thereon for installing and combining a protruding bolt 6, a long spring coil 7 and a rotary screw bolt 8. Further, an axial bolt 5 has a sunken surface 51 separately disposed at upper and lower positions of the fixing body 3, and a plurality of tilted sunken grooves 52 are disposed at positions facing the middle of the turning body 4. Both ends of the long spring coil 7 are clamped and coupled by a protruding center 61 of the protruding bolt 6 and an indent 81 in the rotary screw bolt 8, and an external screw thread 82 disposed on an external surface of the rotary screw bolt 8 is screwed with a screw hole 43 disposed on the turning body 4 for adjusting the resilience of the long spring coil 7, such that after two sets of turning bodies 4 and fixing bodies 3 are installed respectively at upper and lower lateral positions of the door plank 1 and the door frame 2, and the protrusion 41 of the turning body 4 is embedded between two protrusions 31 of the fixing body 3, the penetrating holes 32, 42 can be provided for passing the axial bolt 5 (as shown in FIG. 3), and the sunken surfaces 51 on both upper and lower ends of the axial bolt 5 are in contact with the long screw bolt 3A through the screw thread hole 33 of the fixing body 3, and a tilted sunken groove 52 disposed at the middle of the axial bolt 5 props the protruding bolt 6 by means of the resilience of the long spring coil 7 (as shown in FIG. 4), so as to adjust the opening angle of the door plank 1.
If the door plank 1 and the door frame 2 are installed with the turning body 4 and the fixing body 3 respectively and the turning body 4 and the fixing body 3 are coupled by an axial bolt 5 (as shown in FIGS. 1A and 1B), the length of the long spring coil 7 installed in the transversal screw hole 43 of the turning body 4 will be increased to enhance the resilience. After the door plank 1 is pushed open (as shown in FIG. 4), a push in an opposite direction resumes the door plank 1 to its closed position (as shown in FIGS. 5 and 6), and thus the installed structure of the present invention can overcome the inconvenience of the traditional “two-time construction” of the hinge and automatic door closing device by adopting a “one-time construction” and save time and costs.
In summation of the above description, the present invention definitely achieves the expected objective and provides an improved structure to enhance the performance over the prior art. The invention further complies with the patent application requirements and is duly filed for the patent application.