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A tool for removing damaged fasteners and a method for making such tool wherein the tool (10) includes a first end (12) and a second end (14) with an outside surface (32) and an inside surface (40) defined between ends (12) and (14). A portion (46) of inside surface (40) is in the shape of an hexago

A tool for removing damaged fasteners and a method for making such tool wherein the tool (10) includes a first end (12) and a second end (14) with an outside surface (32) and an inside surface (40) defined between ends (12) and (14). A portion (46) of inside surface (40) is in the shape of an hexagonal frustum (54) that has a major end (58) and that includes spiral splines (25). Splines (25) have constant depth between the major end (58) and the minor end (56) of frustum (54) and the relief angle (.English Pound.) of splines (25) decreases in the direction from minor end (56) toward major end (58). In the method for making the tool (10), a tubular section (118) is made from a tapered blank (91) by piercing one end of the tapered blank with a pierce punch (132). One end of the tubular section is then driven onto a splined punch (162) to provide splines in one end of the tubular section. The tubular section is then stripped off of the punch (162) by a kick-out sleeve (166) and extruded through a round-to-hexagonal extrusion insert (182) to provide portion (46) of the inner surface (40) with a tapered, hexagonal shape.

대표청구항 ▼

A tool for removing damaged fasteners and a method for making such tool wherein the tool (10) includes a first end (12) and a second end (14) with an outside surface (32) and an inside surface (40) defined between ends (12) and (14). A portion (46) of inside surface (40) is in the shape of an hexago

A tool for removing damaged fasteners and a method for making such tool wherein the tool (10) includes a first end (12) and a second end (14) with an outside surface (32) and an inside surface (40) defined between ends (12) and (14). A portion (46) of inside surface (40) is in the shape of an hexagonal frustum (54) that has a major end (58) and that includes spiral splines (25). Splines (25) have constant depth between the major end (58) and the minor end (56) of frustum (54) and the relief angle (.English Pound.) of splines (25) decreases in the direction from minor end (56) toward major end (58). In the method for making the tool (10), a tubular section (118) is made from a tapered blank (91) by piercing one end of the tapered blank with a pierce punch (132). One end of the tubular section is then driven onto a splined punch (162) to provide splines in one end of the tubular section. The tubular section is then stripped off of the punch (162) by a kick-out sleeve (166) and extruded through a round-to-hexagonal extrusion insert (182) to provide portion (46) of the inner surface (40) with a tapered, hexagonal shape. respective locking hole and an outer portion of said hidden marble is disposed in said respective marble socket so as to lock up said rotatable movement between said lock core and said lock body; and a barometric key comprising: a key handle having a compressible air bag provided therein; and a key body having a rod liked shape comprising an air conduit longitudinally extended from said air bag and a plurality of airways, which are radially extended outwardly from said air conduit respectively, provided around said key body corresponding to said axial and radial positions of said air channels in said barometric lock cylinder respectively, such that when said barometric key is inserted into said keyway, a predetermined air pressure applied from said key handle is adapted to drive said marbles to move outwardly into said marble sockets correspondingly, so as to unlock the barometric lock cylinder to enable said lock core to freely rotate to control said locking and unlocking of said latch assembly. 2. The lock assembly, as recited in claim 1, wherein each of said barometric key having a triangular cross section has three engaging surfaces for fittedly inserting into said corresponding shape of said keyway having a triangular cross section wherein said airways are selectively aligned on each engaging surface of said key body in such a axial and radial positions so as to control said marbles in said barometric lock cylinder in three radial directions. 3. The lock assembly, as recited in claim 1, wherein each of said air channels is bent and extended from said inner circumferential surface of said lock core to said respective locking hole for security purpose. 4. The lock assembly, as recited in claim 2, wherein each of said air channels is bent and extended from said inner circumferential surface of said lock core to said respective locking hole for security purpose. 5. The lock assembly, as recited in claim 2, further comprising a lock head comprising a lock face having a key hole aligning with said keyway, a lock frame rearwardly extended on said lock face, a spring housing extended from said lock frame, a key hole block hanging door foldably mounted on said lock frame for closing and opening said key hole, and a restoring leaf spring received in said spring housing for applying an urging pressure on said hanging door. 6. The lock assembly, as recited in claim 4, further comprising a lock head comprising a lock face having a key hole aligning with said keyway, a lock frame rearwardly extended on said lock face, a spring housing extended from said lock frame, a key hole block hanging door foldably mounted on said lock frame for closing and opening said key hole, and a restoring leaf spring received in said spring housing for applying an urging pressure on said hanging door. 7. The lock assembly, as recited in claim 5, wherein said lock face further comprises an elevator wheel rotatably mounted on said lock face, a fender controlled by said elevator wheel for blocking up said hanging door on said key hole, and a fender sliding track for guiding the rotation movement of said fender. 8. The lock assembly, as recited in claim 6, wherein said lock face further comprises an elevator wheel rotatably mounted on said lock face, a fender controlled by said elevator wheel for blocking up said hanging door on said key hole, and a fender sliding track for guiding the rotation movement of said fender. 9. The lock assembly, as recited in claim 7, further comprising a set of cipher wheels having a preset cipher provided on a front surface of said lock face wherein said cipher wheels are communicating with said elevator wheel in such a manner that when said cipher wheels are selectively rotated to match said preset cipher, said fender is slidably moved along said fender sliding track, so as to unblock said hanging door. 10. The lock assembly, as recited in claim 8, further comprising a set of cipher wheels having a preset cipher provided on a front surface of said lock face wherein said cipher wheels are communicating with said elevator wheel in such a manner that when said cipher wheels are selectively rotated to match said preset cipher, said fender is slidably moved along said fender sliding track, so as to unblock said hanging door. 11. The lock assembly, as recited in claim 9, further comprising a protruding part outwardly protruded from said key handle of said barometric key wherein said protruding part is arranged to engage with said cipher wheels in order to rotate said cipher wheels. 12. The lock assembly, as recited in claim 10, further comprising a protruding part outwardly protruded from said key handle of said barometric key wherein said protruding part is arranged to engage with said cipher wheels in order to rotate said cipher wheels. rolling mills whereby the strip consecutively is cold rolled in at least one of said further cold rolling mills and in at least one of said initial cold rolling mills, comprising cold rolling in at least three cold rolling mills without intermediate annealing, reducing the thickness totally by 30-75% before the strip again is annealed and pickled. 2. Method according to claim 1, wherein the thickness of the stainless steel strip is reduced by 20-50% as it passes through said initial cold rolling section for the first time and by max 15% as it passes through the terminating cold rolling mill for the first time. 3. Method according to claim 1, wherein the thickness of the strip is reduced by 20-60% as it passes through said first cold rolling mill section for the second time. 4. Method according to claim 1, wherein the strip is skin-pass rolled about 0.5% as it passes through said terminating cold rolling mill for the second time. 5. Method according to claim 1, wherein the strip is hard-rolled 2-20% as it passes through said terminating cold rolling mill for the second time. 6. Method according to claim 1, wherein the strip is hard-rolled 10-15%, as it passes through said terminating cold rolling mill for the second time. 7. Method for the manufacture of strips of stainless steel, comprising cold rolling of a strip which in a foregoing process has been manufactured through casting a melt to form a cast strip and/or has been hot rolled, wherein the cold rolling is performed in a rolling mill line which comprises, in an initial part of the line, at least two initial cold rolling mills in series, after said initial cold rolling mills at least one annealing furnace and at least one pickling section and, in a terminating part of the line, at least one further cold rolling mill, wherein the cast and/or hot rolled strip, which is dark colored by oxides on the surfaces of the strip, with the dark colored oxides remaining on the surfaces of the strip, first is cold rolled in at least one of said initial cold rolling mills so that the thickness of the strip is reduced totally by 10-75%, then the strip is annealed and pickled in said annealing and pickling sections and is cold rolled in said at least one further cold rolling mill reducing the thickness by max 1.5%, and then the strip is fed once more in the same direction through the same rolling mill line, at which the strip is rolled in at least three initial cold rolling mills, reducing the thickness totally by 30-75%, before the strip again is annealed and pickled. 8. Method accordingly to claim 7, wherein the cast and/or hot rolled strip, which is dark colored by oxides on the surfaces of the strip, with the dark colored oxides remaining on the surfaces of the strip, first is cold rolled in at least one of said initial cold rolling mills so that the thickness of the strip is reduced totally by 10-75%, secondly the strip is annealed and pickled in said annealing and pickling sections but is not worked in said at least one further cold rolling mill. 9. Method for the manufacture of strips of stainless steel, comprising cold rolling of a strip which in a foregoing process has been manufactured through casting a melt to form a cast strip and/or has been hot rolled, wherein the cold rolling is performed in a rolling mill line which comprises, in an initial part of the line, at least two initial cold rolling mills in series, after said initial cold rolling mills at least one annealing section and at least one pickling section and, in a terminating part of the line, at least one further cold rolling mill, wherein the cast and/or hot rolled strip, which is dark colored by oxides on the surfaces of the strip, with the dark colored oxides remaining on the surfaces of the strip, first is cold rolled in at least one of said initial cold rolling mills so that the thickness of the strip is reduced totally by 10-75%, then the strip is annealed in at least one annealing furnace in an annealing secti