Drip coffee filter structure

A drip coffee filter structure, comprising:

• a filter bag which has a cavity internally and comprises a water inlet opened thereon and tear-off edges at both sides adjacent to the water inlet wherein each tear-off edge is closed normally and torn open optionally;
• two hanging ear devices on both sides of the filter bag, respectively, wherein:
• each of the hanging ear devices comprises (a) a fixed portion inside the hanging ear device, (b) a connective segment extending from the top of the fixed portion, (c) two first engagement portions extending to both sides from the connective segment, respectively, (d) a first hook portion extending from each of the first engagement portions, (e) an inner annulus segment extending from the top of the connective segment and surrounding the fixed portion and the connective segment circumferentially, (f) a second engagement portion extending inward from each of the inner annulus segments and (g) a second hook portion extending from each of the second engagement portions;
• the first hook portions make multiple first slots develop at inner sides of the inner annulus segment;
• the second hook portions make multiple second slots develop at inner sides of the inner annulus segment;
• the inner annulus segment links an outer annulus segment circumferentially;
• the outer annulus segment and the fixed portion are fixed at both lateral sides of the filter bag, respectively;
• wherein the two first engagement portions are adjacent to the water inlet but the two second engagement portions are way from the water inlet such that the two first engagement portions on top and the two opposite second engagement portions on bottom sit atop four corners inside the inner annulus segment;
• wherein the first hook portion extends from each of the first engagement portions and toward the center of the fixed portion horizontally and has a hooked contour further extending downward and outward and becoming a continuous inverted-hook shape;
• wherein each of the second hook portions has a hooked contour vertically extending toward the water inlet and becoming a continuous inverted-hook shape which extends horizontally and keeps away from the water inlet.