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A sheath for a folding tool such as a folding knife that is variably positionable during use. A variably positionable knife, according to the present invention, includes a sheath formed with a cavity. At least one rail is formed in the cavity. A chamber juxtaposed to the cavity also is formed in the

A sheath for a folding tool such as a folding knife that is variably positionable during use. A variably positionable knife, according to the present invention, includes a sheath formed with a cavity. At least one rail is formed in the cavity. A chamber juxtaposed to the cavity also is formed in the sheath. The chamber is substantially hollow, and is formed to allow removable insertion of a locking tongue. The locking tongue includes a dome segment that applies pressure on the rail. A disk is included. The disk is rotatably mountable on the sheath, and includes a plurality of pegs. A hole is formed in for insertion of a connector. A groove is formed in the disk. In addition, the sheath includes a plug formed with a slot. An elastic o-ring is placed in both the groove and slot. The sheath also includes a block formed with a plurality of apertures in which the pegs are positionable. A band is engaged with the block for securing the sheath on a user.

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1. A holder for a folding tool, comprising:a sheath formed with a cavity,wherein the cavity includes at least one rail;a chamber juxtaposed to the cavity;means for variably positioning the sheath during use; andmeans for securing the sheath to a user. 2. A holder for a folding tool as recited in cla

1. A holder for a folding tool, comprising:a sheath formed with a cavity,wherein the cavity includes at least one rail;a chamber juxtaposed to the cavity;means for variably positioning the sheath during use; andmeans for securing the sheath to a user. 2. A holder for a folding tool as recited in claim 1, wherein the sheath is formed with a proximal end, a distal end, and opposing fins between the proximal end and distal end. 3. A holder for a folding tool as recited in claim 2, wherein the at least one rail extends along a longitudinal axis through the cavity between the proximal end and the distal end of the sheath. 4. A holder for a folding tool as recited in claim 1, wherein the chamber is substantially hollow and wherein the chamber is monolithically formed in the sheath. 5. A holder for a folding tool as recited in claim 4, further comprising a locking tongue removably insertable in the chamber. 6. A holder for a folding tool as recited in claim 1, wherein the securing means includes a block formed with an inner plate, and outer plate, a border between the inner plate and outer plate, and a plurality of apertures formed in the outer plate. 7. A holder for a folding tool as recited in claim 6, wherein the securing means further comprises a lap-over band engagable with the block for securing the holder on a user. 8. A holder for a folding tool as recited in claim 1, wherein the locking tongue includes a leading end, a trailing end, an upper surface, and an undersurface. 9. A holder for a folding tool as recited in claim 8, wherein the leading end tapers inwardly toward the longitudinal axis through the locking tongue to a shoe formed in the leading end. 10. A holder for a folding tool as recited in claim 9, wherein an arch is formed in the locking tongue between the leading end and the trailing end to form a dome segment on the upper surface. 11. A holder for a folding tool as recited in claim 1, wherein the variably positioning means includes a disk rotatably mountable on the sheath, and wherein the disk is formed with an anterior side, a posterior side, and a wall therebetween. 12. A holder for a folding tool as recited in claim 11, wherein the disk further comprises a plurality of pegs extending from the anterior side of the disk. 13. A holder for a folding tool as recited in claim 12, wherein the disk further comprises a hole formed substantially in the middle of the disk extending between the anterior side and the posterior side of the disk for insertion of a threaded screw. 14. A holder for a folding tool as recited in claim 13, wherein the disk further comprises at least one groove that extends through two points of the wall. 15. A holder for a folding tool as recited in claim 14, wherein the variably positioning means includes a plug formed at the distal end of the sheath. 16. A holder for a folding tool as recited in claim 15, wherein the plug is further formed with a slot. 17. A holder for a folding tool as recited in claim 16, further comprising at least one elastic O-ring demountably positionable in the groove and slot. 18. A variably positionable sheath for a folding knife, comprising:a sheath,wherein the sheath is formed with opposing fins, an exterior surface, an interior surface, a proximal end, and a distal end;a substantially hollow chamber formed monolithically in the sheath;a resilient locking tongue removably insertable in the hollow chamber;a rotatable disk mountable on the substantially hollow chamber,wherein the rotatable disk is formed with a groove;a plug formed at the distal end of the interior surface of the sheath,wherein the plug further is formed with a slot;an O-ring demountably positionable in the groove and the slot; andmeans for detachably securing the sheath to a user. 19. A variably positionable sheath for a folding knife as recited in claim 18, wherein the opposing fins are engagable with the folding knife. 20. A variably positionable sheath for a folding knife as recited in claim 18, wherein the sheath further comprises opposing rails within the sheath extending between the proximal end and the distal end of the sheath. 21. A variably positionable sheath for a folding knife as recited in claim 18, wherein the resilient locking tongue is formed with a dome segment for applying pressure against at least one of the opposing rails to hold the folding knife in the sheath. 22. A variably positionable sheath for a folding knife as recited in claim 18, wherein the rotatable disk further comprises one or more pegs monolithically protruding from the rotatable disk. 23. A variably positionable sheath for a folding knife as recited in claim 18, wherein the rotatable disk includes a groove. 24. A variably positionable sheath for a folding knife as recited in claim 18, wherein the detachably securing means includes a block having one or more apertures. 25. A variably positionable sheath for a folding knife as recited in claim 18, wherein the detachably securing means includes a clamp engagable with the block. 26. A system for sheathing a knife, comprising:a sheath formed with a cavity,wherein the cavity further comprises opposing rails;a device connectable to the sheath for variably positioning the sheath;a chamber interposed between the cavity and the device;a tongue removably insertable into the chamber; andmeans attachable to the sheath for securing the system during use. 27. A system for sheathing a knife as recited in claim 26, wherein the sheath further comprises one or more fins engagable with the knife. 28. A system for sheathing a knife as recited in claim 27, wherein the device includes a disk formed with an anterior side, a posterior side, and a wall between the anterior side and the posterior side. 29. A system for sheathing a knife as recited in claim 28, wherein the disk further comprises a plurality of pegs extending from the anterior side of the disk. 30. A system for sheathing a knife as recited in claim 29, wherein the disk further comprises a hole formed substantially in the middle of the disk and extending between the anterior side and the posterior side of the disk for insertion of a connector selected from the group of connectors consisting of screws, nails, rivets, staples, nuts and bolts. 31. A system for sheathing a knife as recited in claim 30, wherein the disk further comprises at least one groove. 32. A system for sheathing a knife as recited in claim 31, wherein a slot is formed in the sheath. 33. A system for sheathing a knife as recited in claim 32, wherein the device further comprises at least one substantially elastic O-ring demountably positionable in the groove and the slot. 34. A method for manufacturing a sheath for a folding knife, comprising:providing a sheath;shaping the sheath to include opposing fins;forming monolithically a substantially hollow chamber in the sheath;including a resilient bowed locking tongue for removable insertion in the hollow chamber;configuring a disk for rotatable mounting on the sheath;disposing on the sheath means for returning the sheath to a zero position; andfurnishing means for securing the sheath on a user. 35. A method for manufacturing a sheath for a folding knife as recited in claim 34, wherein the substantially hollow chamber forming step includes the substeps of:providing a first opening and a second opening to the chamber; anddimensioning the second opening to be smaller than the first opening. 36. A method for manufacturing a sheath for a folding knife as recited in claim 34, wherein the resilient bowed locking tongue including step includes the substeps of:shaping the resilient bowed locking tongue to include a leading end, a trailing end, an upper surface, and an undersurface;configuring the leading end to be dimensionally smaller than the trailing end;forming a shoe monolithically on the leading end; andshaping the resilient bowed locking tongue to include an arch between the leading end and the trailing end. 37. A method for manufacturing a sheath for a folding knife as recited in claim 34, wherein the disk configuring step includes the substeps of:shaping the disk to have an anterior side, a posterior side, and a wall therebetween;installing one or more pegs on the anterior side of the disk; andforming a hole substantially in the middle of the disk for insertion of a screw. 38. A method for manufacturing a sheath for a folding knife as recited in claim 34, wherein the securing means furnishing step includes the substep of providing a metal clamp engagable with a belt of a user of the system. 39. A method for manufacturing a sheath for a folding knife as recited in claim 34, wherein the sheath providing step includes the substeps of;shaping the sheath to have a proximal end and a distal end; andforming at least two rails within the sheath between the proximal end and the distal end. 40. A method for manufacturing a sheath for a folding knife as recited in claim 39, wherein the zero position disposing means includes he substeps of:forming a groove in the disk that extends through the wall;including a plug at the distal end of the sheath;shaping a slot in the plug;providing an elastic O-ring demountably positionable in the groove and the slot;equipping the sheath with a block formed with an inner plate, and outer plate, and a border between the inner plate and outer plate; andforming in the outer plate one or more apertures engagable with the one or more pegs.