초록 ▼

The closure device for a circular conduit opening may be used to inhibit entry of debris and other matter into a conduit. The closure device may have an outer band, an inner band and a cover wherein a perimeter edge of the cover may be fastened between the outer band and the inner band. The outer ba

The closure device for a circular conduit opening may be used to inhibit entry of debris and other matter into a conduit. The closure device may have an outer band, an inner band and a cover wherein a perimeter edge of the cover may be fastened between the outer band and the inner band. The outer band may have two separated overlapping ends and the inner band having two separated ends. A clamp may be attached to one of the inner band and the outer band.

대표청구항 ▼

1. A device to inhibit entry of debris and other matter into a conduit comprising:an outer band, an inner band wherein said inner band disposed interior to said outer band and a cover wherein a perimeter edge of said cover is wrapped around said outer band and is fastened between said outer band and

1. A device to inhibit entry of debris and other matter into a conduit comprising:an outer band, an inner band wherein said inner band disposed interior to said outer band and a cover wherein a perimeter edge of said cover is wrapped around said outer band and is fastened between said outer band and said inner band;said outer band having two separated ends and said inner band having two separated ends; andan expansion clamp attached to one of said inner band and said outer band.2. The device as in claim 1 wherein said outer band having a portion of said outer band overlapping adjacent said two separated ends and said expansion clamp is attached to said inner band.3. The device as in claim 1 wherein said fastening is with a plurality of screws.4. The device as in claim 1 wherein said expansion clamp comprising:a lever bracket having a lever rotatably attached at a lever rotation end;an adjustment rod rotatably attached to said lever intermediate said lever rotation end and a distal end; anda rod retainer bracket having an opening therein.5. The device as in claim 4 wherein said adjustment rod is threaded for threadable engagement of a nut.6. The device as in claim 1 wherein a plurality of anchor bolts are threadably engaged with one of said inner band and said outer band; and said anchor bolts movable through said inner band and said outer band for engagement with a conduit wall.7. The device as in claim 1 wherein a handle is attached.8. The device as in claim 1 wherein said inner band at an upper edge is approximately the same height as said perimeter edge wrapped around said outer band.9. The device as in claim 1 wherein said inner band is relatively narrower than said outer band.10. The device as in claim 9 wherein said expansion clamp is attached to said outer band.11. A device to inhibit entry of debris and other matter into a conduit comprising:an elastic outer band, an elastic inner band wherein said inner band disposed interior to said outer band and a flexible cover wherein a perimeter edge of said cover is fastened between said elastic outer band and said elastic inner band;said elastic outer band having two separated ends with a portion of said outer band overlapping adjacent said two separated ends and said elastic inner band having two separated ends;an expansion clamp attached to one of said elastic inner band and said elastic outer band wherein said elastic inner band and said elastic outer band expandable by force of said expansion clamp; anda plurality of anchor bolts are threadably engaged with one of said elastic inner band and said elastic outer band, and said anchor bolts movable through said elastic inner band and said outer band for engagement with a conduit wall.12. The device as in claim 11 wherein said perimeter edge is wrapped around said elastic outer band prior to fastening.13. The device as in claim 11 wherein said expansion clamp comprising:a lever bracket having a lever rotatably attached at a lever rotation end;an adjustment rod rotatably attached to said lever intermediate said lever rotation end and a distal end; anda rod retainer bracket having an opening therein.14. The device as in claim 13 wherein said adjustment rod is threaded for threadable engagement of a nut.15. The device as in claim 11 wherein a handle is attached.