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A movable filter grid for a drain inlet has a drain grill, an annular seat and an annular fastener. The drain grill has an annular plate and multiple support ribs. A first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib

A movable filter grid for a drain inlet has a drain grill, an annular seat and an annular fastener. The drain grill has an annular plate and multiple support ribs. A first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib radially extends outwards from the annular plate. An inner wall of an annular seat is securely connected to the second ends of the support ribs. The annular fastener has multiple pin holders annularly connected. Each pin holder has a through hole vertically formed through the pin holder and detachably mounted through by a pin. When the movable filter grid is applied to drain inlets on different terrains, the pins taking the form of a grating can prevent debris from blocking the drain holes.

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1. A movable filter grid for a drain inlet, comprising: a drain grill having: an annular plate; andmultiple support ribs, wherein a first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib radially extends outwards from the

1. A movable filter grid for a drain inlet, comprising: a drain grill having: an annular plate; andmultiple support ribs, wherein a first end of each support rib is connected to an outer circumferential edge of the annular plate, and a second end of the support rib radially extends outwards from the annular plate;an annular seat, wherein an inner wall of the annular seat is securely connected to the second ends of the support ribs; andan annular fastener having multiple pin holders annularly connected, each pin holder having: a holding slot formed in a bottom of the pin holder for the pin holder to be mounted on the annular seat; anda through hole formed through an outer edge portion of the pin holder, each through hole detachably mounted through by a pin, wherein the pins take a form of a grating. 2. The movable filter grid as claimed in claim 1, wherein each pin has: a holding end horizontally formed on one end of the pin, wherein a length of the holding end of the pin is larger than a diameter of the through hole of a corresponding pin holder; anda bead having a recess formed in the bead for the other end of the pin to be inserted in the bead. 3. The movable filter grid as claimed in claim 2, wherein the drain grill further has at least one support ring; and the annular plate and the at least one support ring are concentrically arranged in an outward direction and sequentially securely connected with the support ribs. 4. The movable filter grid as claimed in claim 3, wherein the annular plate has: an opening formed through the annular plate; anda reflector mounted on a top of the annular plate;the pin is a nail; andthe bead is a protection cap. 5. A movable filter grid for a drain inlet, comprising: a drain grill having: an upper ring formed on a top end of the drain grill;a lower ring formed on a bottom end of the drain grill and having multiple tubes annularly formed on an outer periphery of the lower ring and mutually spaced apart by a space, wherein each tube has a through hole formed through the tube; andmultiple support ribs radially formed between the upper ring and the lower ring; andmultiple pins respectively movably inserted into the through holes of the tube and taking the form of a grating. 6. The movable filter grid as claimed in claim 5, further comprising a cup mounted on the upper ring with a cup rim of the cup engaging an inner wall of the upper ring, and the cup loaded with a weight to get a stable center of gravity for the drain grill. 7. The movable filter grid as claimed in claim 6, further comprising a top lid covering the upper ring and having a top opening for the ease of hand-carrying, wherein the lower ring further has multiple bottom pillars formed on inner surfaces of the tubes, and the bottom pillars being higher than the lower ring. 8. The movable filter grid as claimed in claim 7, wherein the upper ring has: an annular inner flange formed on and protruding radially and inwards from a lower portion of the inner wall of the upper ring; andmultiple water holes formed through the inner wall of the upper ring; andthe cup has an annular outer flange formed on and protruding radially and outwards from the cup rim of the cup to correspond to the annular inner flange of the upper ring. 9. The movable filter grid as claimed in claim 8, wherein each water hole has a first snap portion horizontally formed in a recessed portion of the water hole; andthe top lid further has multiple second snap portions formed on and protruding downwards from an inner surface of the top lid, wherein each second snap portion engages a corresponding first snap portion on the inner wall of the upper ring. 10. The movable filter grid as claimed in claim 9, wherein each pin has: a stopper formed on a top end of the pin;a conical tip formed on a bottom end of the pin; andan annular flange formed on and radially protruding outwards from a top end of the conical tip, wherein an outer diameter of the annular flange of each pin is larger than an inner diameter of the through hole of a corresponding tube; andthe top lid further has multiple top pillars formed on and protruding downwards from the inner surface of the top lid, and abutting against a top surface of the annular outer flange of the cup.