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A seat track mechanism for a vehicle seat, comprises a pair of substantially parallel movable rails attached to the vehicle seat, a pair of substantially parallel stationary rails attached to a floor section of a vehicle, the movable rails being combined with the stationary rails so as to be slidabl

A seat track mechanism for a vehicle seat, comprises a pair of substantially parallel movable rails attached to the vehicle seat, a pair of substantially parallel stationary rails attached to a floor section of a vehicle, the movable rails being combined with the stationary rails so as to be slidable along the stationary rails, and shutter members for covering the stationary rails, the shutter members being movably supported to the stationary rails so as to pass around one ends of the stationary rails, around the other ends of the stationary rails, and then under bottom portions of the stationary rails, the shutter members having openings, and the movable rails being combined with the stationary rails through the openings of the shutter members.

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What is claimed is: 1. A seat track mechanism for a vehicle seat, comprising: a pair of substantially parallel movable rails attachable to said vehicle seat; a pair of substantially parallel stationary rails attachable to a floor section of a vehicle; said movable rails being combined with said sta

What is claimed is: 1. A seat track mechanism for a vehicle seat, comprising: a pair of substantially parallel movable rails attachable to said vehicle seat; a pair of substantially parallel stationary rails attachable to a floor section of a vehicle; said movable rails being combined with said stationary rails so as to be slidable along said stationary rails; and shutter means for covering said stationary rails; said shutter means being movably supported to each of said stationary rails so as to pass around one end of a corresponding stationary rail, around the other end of the stationary rail, and then under a bottom portion of the stationary rail; said shutter means having an opening; and each of said movable rails being combined with a corresponding stationary rail through said opening. 2. A seat track mechanism as defined in claim 1 wherein said shutter means comprises, an elongated endless belt and said endless belt comprises a plurality of narrow strips which are disposed adjacent to one another and connected to one another by hinge pins. 3. A seat track mechanism as defined in claim 1, further including shutter guide means provided at each of said stationary rails, said shutter means being movably supported through said shutter guide means to said stationary rail so as to be movable along said stationary rail. 4. A seat track mechanism as defined in claim 2, further including shutter guide means provided at each of said stationary rails, said shutter means being movably supported through said shutter guide means to said stationary rail so as to be movable along said stationary rail. 5. A seat track mechanism as defined in claim 1 wherein said seat track mechanism is adapted for installation in a power seat. 6. A seat track mechanism as defined in claim 2 wherein said seat track mechanism is adapted for installation in a power seat. 7. A seat track mechanism as defined in claim 3 wherein said seat track mechanism is adapted for installation in a power seat. 8. A seat track mechanism as defined in claim 4 wherein said seat track mechanism is adapted for installation in a power seat. 9. A seat track mechanism as defined in claim 5 that is provided with a power slide mechanism which comprises a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, and said screw nut being held by said gear box. 10. A seat track mechanism as defined in claim 6 that is provided with a power slide mechanism which comprises a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, and said screw nut being held by said gear box. 11. A seat track mechanism as defined in claim 7 that is provided with a power slide mechanism which comprises a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, and said screw nut being held by said gear box. 12. A seat track mechanism as defined in claim 8 that is provided with a power slide mechanism which comprises a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, and said screw nut being held by said gear box. 13. A combination of a vehicle seat and a seat track mechanism, said combination comprising a vehicle seat and a seat track mechanism; said seat track mechanism comprising: a pair of substantially parallel movable rails attached to said vehicle seat; a pair of substantially parallel stationary rails attachable to a floor section of a vehicle; said movable rails being combined with said stationary rails so as to be slidable along said stationary rails; and shutter means for covering said stationary rails; said shutter means being movably supported to each of said stationary rails so as to pass around one end of a corresponding stationary rail, around the other end of the stationary rail, and then under a bottom portion of the stationary rail; said shutter means having an opening; and each of said movable rails being combined with a corresponding stationary rail through said opening. 14. A combination as defined in claim 13 wherein said shutter means has a elongated endless belt, which comprises a plurality of narrow strips which are disposed adjacent to one another and connected to one another by hinge pins. 15. A combination as defined in claim 13, further including shutter guide means provided at each of said stationary rails, said shutter means being movably supported through said shutter guide means to said stationary rail so as to be movable along said stationary rail. 16. A combination as defined in claim 14, further including shutter guide means provided at each of said stationary rails, said shutter means being movably supported through said shutter guide means to said stationary rail so as to be movable along said stationary rail. 17. A combination as defined in claim 13 wherein said vehicle seat comprises a power seat. 18. A combination as defined in claim 14 wherein said vehicle seat comprises a power seat. 19. A combination as defined in claim 15 wherein said vehicle seat comprises a power seat. 20. A combination as defined in claim 16 wherein said vehicle seat comprises a power seat. 21. A combination as defined in claim 17 wherein said power seat is provided with a power slide mechanism, said power slide mechanism comprising a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, said screw nut being held by said gear box. 22. A combination as defined in claim 18 wherein said power seat is provided with a power slide mechanism, said power slide mechanism comprising a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, said screw nut being held by said gear box. 23. A combination as defined in claim 19 wherein said power seat is provided with a power slide mechanism, said power slide mechanism comprising a reversible motor attached to a side of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, said screw nut being held by said gear box. 24. A combination as defined in claim 20 wherein said power seat is provided with a power slide mechanism, said power slide mechanism comprising a reversible motor attached to a aide of one of said movable rails, a lead screw arranged within each of said stationary rails so as to extend along a corresponding stationary rail and supported to said stationary rail, a screw nut mounted on said lead screw so as to be movable along said lead screw and meshed with said lead screw, a gear box provided in each of said movable rails, and a worm gear arranged within said gear box, coupled to said reversible motor, and meshed with said screw nut, said screw nut being held by said gear box.