IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0651781
(2007-01-11)
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등록번호 |
US-7670093
(2010-04-21)
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발명자
/ 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
16 |
초록
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Non-prismatic shank fasteners, such as nails, for wood and similar soft materials have a plurality of longitudinal extending non-congruent sections having different geometries, different configurations, and varying diameters such that the shank has the widest nominal diameter arranged to span a join
Non-prismatic shank fasteners, such as nails, for wood and similar soft materials have a plurality of longitudinal extending non-congruent sections having different geometries, different configurations, and varying diameters such that the shank has the widest nominal diameter arranged to span a joint between wood members being fastened. The shank has four circumferentially symmetrically disposed grooves and ridges having dimensions within pre-determined ranges such that the ridges have sufficient strength to withstand the forces imposed on the shank being driven into the parent material and to resist loads imposed upon them by the loads to the parent material. The grooves have a sufficiently wide jaw opening to allow elastically compressed parent material to enter the groove and provide support to the shank. The non-prismatic grooved shanks demonstrate significantly greater load handling capability than that possessed by other known types of fasteners.
대표청구항
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The invention claimed is: 1. A fastener having a non-prismatic shank with an overall length L, the fastener intended for fastening elastic/plastic materials together and forming a joint for resisting lateral loads, the shank comprising; a section extent of said shaft being located in the midsection
The invention claimed is: 1. A fastener having a non-prismatic shank with an overall length L, the fastener intended for fastening elastic/plastic materials together and forming a joint for resisting lateral loads, the shank comprising; a section extent of said shaft being located in the midsection of said length and having generally straight, longitudinally extending ridges and grooves providing a variation in strength of cross section along the length of the shank, the ridges and grooves arranged symmetrically about the circumference of the shaft, the section extent including the shaft's maximum diameter D defined between the tips of oppositely-arranged ridges, the perimeter of a circle having diameter D inscribing the ridge's tips where the diameter D is in proportion to the length L and conforms to the following expressions: D is greater than or equal to 0.059 times L, and is less than 0.074 times L; the maximum diameter is arranged along the midsection of the shank in such manner as to be locatable at a joint in fastened materials in its intended use, the diameter between opposite grooves defining a core diameter that is approximately 0.59 times D and which defines the central core of the shaft, the area of the central core comprising at least 44 percent of the shank total shank cross-sectional area, and wherein the cross-sectional shape of the section extent as defined by the ridges and grooves has a moment of inertia about any axis through its center that is equal at each 45 degrees rotation of the axis, the length of the section extent being equal to or greater than 55% of the shank length L, the width of the each ridge tip having a length that is not less than about 0.12 times D and not greater than about 0.3 times D, each ridge being wider at its base than at its tip, the base width being of the order 0.44 times D thereby allowing the grooves to have sufficiently wide angular opening for material displaced by the shank to elastically compress and contact the shank by entering the grooves. 2. The fastener of claim 1, wherein the tapered sides of each groove have a slope in a range of the order of 9 to 26 degrees with respect to a transverse axis of the shank, and opposite sides of the grooves conform to portions of arcs having a radius of approximately the diameter D of the midsection of the shank that subtend chords that extend from a tip of one ridge to an opposite tip of an adjacent ridge. 3. The fastener of claim 1, wherein said grooves and ridges are located in said midsection and in a portion of first and second transition sections. 4. The fastener of claim 1, wherein said midsection has a length in the range of the order of about 0.20L to 0.35L, where L is the length of the shank. 5. The fastener of claim 1, wherein the shank further has a longitudinally extending section between the grooved midsection and a pointed tip section, a portion of which naturally tapers as the grooves diminish to the pointed tip section. 6. The fastener of claim 5, wherein said midsection has a length of the order of 0.6L, and the fastener midsection having a length that is adapted to span a joint between multiple members. 7. The fastener of claim 6, wherein said midsection has a taper in the range of the order of 0 to 1 degree, and said section between the grooved midsection and the pointed tip has a taper in the range of the order of 1 to 5 degrees. 8. The fastener of claim 5, wherein the shank has another longitudinally extending section between the grooved midsection and a cylindrical section, a portion of which tapers as the grooves diminish to the cylindrical section. 9. The fastener of claim 1, wherein said grooves extend from peripheral tips of the ridges to substantially said central core, and said grooves have tapered sides conforming to portions of arcs that subtend chords that extend from a tip of one ridge to an opposite tip of an adjacent ridge, said arcs having a radius approximately equal to a diameter D of the shank. 10. The fastener of claim 9, wherein said tips of said ridges have a total peripheral length of between 15% to 38% of the linear circumference of the said circle having diameter D. 11. The fastener of claim 1, wherein said shank has a upper stem section adjacent the head, a midsection, and a tapered lower section between the midsection and the pointed tip section, at least a portion of said lower section being twisted relative to the midsection about a longitudinal axis of the shank such that the ridges form shoulders in the lower section. 12. The fastener of claim 11, wherein said lower section is twisted by an angle in the range of the order of 45 to 90 degrees. 13. The fastener of claim 12, wherein said fastener has a length sufficient to locate said twisted portion substantially beyond a joint between first and second members being joined by the fastener. 14. The fastener of claim 11, wherein said ridges and grooves in said lower section below said shoulder extend longitudinally to the region of the pointed tip section offset circumferentially by an angle from said ridges and grooves in said midsection. 15. The fastener of claim 1, wherein said section extent has a cruciform cross section comprising four longitudinally extending grooves and radially projecting ridges disposed circumferentially symmetrically about the shank. 16. A fastener having a non-prismatic shank with an overall length L, the fastener intended for fastening elastic/plastic materials together and forming a joint for resisting lateral loads, the shank comprising; a section extent of said shaft being located in the midsection of said length and having generally straight, longitudinally extending ridges and grooves providing a variation in strength of cross section along the length of the shank, the ridges and grooves arranged symmetrically about the circumference of the shaft, the section extent including the shaft's maximum diameter D defined between the tips of oppositely-arranged ridges, the perimeter of a circle having diameter D inscribing the ridge's tips where the diameter D is in proportion to the length L and conforms to the following expressions: D is greater than or equal to 0.059 times L, and is less than 0.074 times L; the maximum diameter is arranged along the midsection of the shank in such manner as to be locatable at a joint in fastened materials in its intended use, the diameter between opposite grooves defining a core diameter that is approximately 0.59 times D and which defines the central core of the shaft, the area of the central core comprising at least 44 percent of the shank total shank cross-sectional area, and each groove having a jaw opening in the angular range of 105 to 145 degrees and each groove's shape being defined by two arcs, each arc having a relatively large radius and each arc extending approximately 0.35 radians so that together, the overall shape of the groove is substantially cylindrically concave but each side of the groove is generally planar, the length of the section extent being equal to or greater than 55% of the shank length L, the width of the each ridge tip having a length that is not less than about 0.12 times D and not greater than about 0.3 times D, each ridge being wider at its base than at its tip, the base width being of the order 0.44 times D thereby allowing the grooves to have sufficiently wide angular opening for material displaced by the shank to elastically compress and contact the shank by entering the grooves.
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