US20020002006A1 - Screw fastening structure and nut member - Google Patents
Screw fastening structure and nut member Download PDFInfo
- Publication number
- US20020002006A1 US20020002006A1 US09/311,365 US31136599A US2002002006A1 US 20020002006 A1 US20020002006 A1 US 20020002006A1 US 31136599 A US31136599 A US 31136599A US 2002002006 A1 US2002002006 A1 US 2002002006A1
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- flank
- fastening structure
- screw fastening
- female thread
- conductive
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- 239000003973 paint Substances 0.000 claims abstract description 46
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/002—Nuts or like thread-engaging members cutting threads during screwing; removing paint or dirt layers covering threaded shanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/307—Clamped connections, spring connections utilising a screw or nut clamping member characterised by the thread of the screw or nut
Definitions
- the present invention relates to a screw fastening structure and a nut member, and in particular, to a screw fastening structure of the type that includes a male thread and a female thread to be electrically connected to each other, and a nut member of the type that has a female thread constituting a circuit element to be electrically connected to a mating male thread.
- an aspect of the invention provides a screw fastening structure comprising a conductive male thread having a first flank covered with an insulating paint coat, a conductive female thread having a second flank, and an electric contact interconnecting the first and second flanks through the paint coat.
- the second flank of the conductive female thread is electrically connected to the first flank of the conductive male flank, by the electric contact interconnecting them through the paint coat, permitting a secured current conduction.
- the electric contact may preferably comprise a conductive projection formed on the second flank.
- another aspect of the invention provides a nut member comprising a conductive female thread having a flank, and a conductive projection formed on the flank.
- the nut member may further comprise a substantially straight nut body formed with the female thread and provided with a polarity identifier for identifying a polarity in orientation of the projection.
- FIGS. 1A, 1B, and 1 C illustrate a screw fastening structure according to a first embodiment of the invention, in which FIG. 1A is a section of a nut member of the screw fastening structure, FIG. 1B, a section of the screw fastening structure, and FIG. 1C, a detail of a structure within a circle “ 1 C” of FIG. 1B;
- FIGS. 2A and 2B illustrate a fastening state of the screw fastening structure according to the first embodiment, in which FIG. 2A is a section of the screw fastening structure, and FIG. 2B, a detail of an essential portion of FIG. 2A;
- FIGS. 3A and 3B illustrate a screw fastening structure according to a second embodiment of the invention, in which FIG. 3A is a section of the screw fastening structure, and FIG. 3B, a detail of a structure within a circle “ 3 B” of FIG. 3A; and
- FIGS. 4A and 4B illustrate a nut member of the screw fastening structure according to the second embodiment, in which FIG. 4A is a plan of the nut member, and FIG. 4B, a detailed section of an essential portion of FIG. 4A.
- FIGS. 1A, 1B, 1 C and 2 A, 2 B illustrate a screw fastening structure according to a first embodiment of the invention, in which an electrically conductive nut element E 1 (as a female thread component) is screwed onto an electrically insulated conductive bolting element E 2 (as a male thread component), which (E 2 ) has an anti-corrosive, well adhesive, scratch-resistive and electrically non-conductive external paint layer L extending over, and is fixed in an electrically connecting manner to, an electrically conductive portion B 1 of a body B of a vehicle that (B 1 ) has a number of electrically conductive or electrostatically active unshown vehicular components attached thereto, such as a piping and a heat shield plate, and that (B 1 ) is electrically grounded.
- the nut element E 1 comprises a hexagonal straight nut 1 constituted with an electrically conductive nut body 10 having a central straight hollow 10 a and a female thread portion 11 tapped in a wall of the hollow 10 a.
- the nut element E 1 is screwed on the bolting element E 2 .
- the bolting element E 2 comprises an electrically conductive stud bolt 20 and a paint coat 23 put thereon as part of the paint layer L.
- the bolt 20 has a male thread portion 21 died in a cylindrical side wall, and is contacted and directly welded at a proximal end 20 a thereof to the vehicle body portion B 1 .
- the male thread portion 21 is wholly covered by the paint coat 23 , as the welded bolt 20 is unmasked when paint is sprayed over the vehicle body portion B 1 to thereby provide the paint layer L, because a masking costs high.
- the female thread portion 11 of the nut 1 comprises a number of equally pitched spirally extending continuous screws of a female thread 12 that has in its profile a thrust bearing flank 12 a (at a near side to the proximal end 20 a or an upside in the figure) and an opposing flank 12 b (at a far side from the proximal end 20 a or a downside in the figure), and the male thread portion 21 of the bolt 20 comprises a larger number of equally pitched spirally extending continuous screws of a male thread 22 that has in its profile a thrust bearing flank 22 a (at a near side to the proximal end 20 a or a downside in the figure) and an opposite flank 22 b (at a far side from the proximal end 20 a or an upside in the figure).
- the female thread 12 has a projection 13 provided as an electrical contact element on the thrust bearing flank 12 a , substantially at a middle position between flat ridges 14 and 24 (or flat or round roots 15 and 25 ) of the male and female threads 12 and 22 , in a substantially triangular cross-sectional form with a vertex 13 a of an obtuse angle near or close to a right angle or within a preferable angle range of 90° to 120°.
- the obtuse-angled projection 13 is tapped and trimmed, together with the flank 12 a.
- the projection 13 breaks through an intervening part of the paint coat 23 and bites into a substantially straight slope 22 c of the thrust bearing flank 22 a , as illustrated in FIG. 1C where the nut 1 is tightened with an increasing magnitude of torque T by virtue of a thrust source (e.g. B 1 +L+W in FIG. 1B) acting thereon.
- a thrust source e.g. B 1 +L+W in FIG. 1B
- an exposed underside or bottom 10 b of the body 10 of nut 1 is electrically connected to the conductive portion B 1 of vehicle body B, via the thread 12 of female thread portion 11 , the projection 13 of flank 12 a , the thread 22 of male thread portion 21 , a body of the bolt 20 , and the welded end 20 a of bolt 20 .
- the projection 13 spirally continuously extends along the ridge 14 of the female thread 12 , with a projection dimension to be set, as a height of the vertex 13 a relative to a substantially straight slope 12 c of the thrust bearing flank 12 a , to be smaller than a designed fitting clearance C between the female and male threads 12 and 22 , but not excessively smaller than an apparent fitting clearance Ca between the nut element E 1 and the bolting element E 2 that (Ca) is substantially equivalent to C ⁇ t, where t is an average thickness of the paint coat 23 .
- the projection dimension may be approx. 0.05 mm, as the nominal diameter D of the nut 1 is a 8 mm.
- the obtuse angle of the vertex 13 a is defined between an ascendingly radially extending thrust bearing face 13 b and a substantially axially extending cut-in face 13 c of the projection 13 , in which the thrust bearing face 13 b has an ascending angle set (to be about 10° in this case) relative to a radial reference plane S, in consideration of the service life of a tap (not shown) having a special envelope form to or reverse form of the female thread 12 which includes the projection 13 , and the productivity of nut 1 , as well as for qualities to be secured such as of configuration, dimensions and applicability of and current conduction and defined cutting by the projection 13 . If the obtuse angle is excessive (e.g.
- FIG. 2A after application of an electrically conductive flat washer or terminal W, the nut 1 is applied on the bolt 20 and traveling on a way of screw-down without significant thrust forces, where the projection 13 , which has a smaller projection height to the flank 12 a of female thread 12 than the fitting clearance C between the nut 1 and the welded bolt 20 , is substantially free from interference with the flank 22 a of male thread 22 of the bolt 20 so that the nut 1 kept from galling and seizing, while the paint coat 23 on a region of male thread screws where the nut 1 has traveled is substantially maintained (i.e. not scraped off) and permits an anti-corrosive property to be secured.
- the nut 1 is seated on the terminal W with a sufficient thrust force F produced to act thereon for strong fixation to the vehicle body B, which force F has caused the projection 13 on the flank 12 a of female thread 12 to bite in the flank 22 a of male thread 22 , so that this flank 22 a is electrically connected with that flank 12 a , allowing for the nut 1 to be employed as a grounding component.
- the projection 13 is formed on the thrust bearing flank 12 a of the female thread 12 , continuously along the ridge 14 , and when the nut 1 is seated on the terminal W, it ( 13 ) has bitten in the flank 22 a of male thread 22 over length of its spiral, permitting a conforming current conduction therebetween, with an enhanced grounding performance, as well as an enhanced anti-loosening performance due to the biting.
- the straight nut body 10 is provided on the top face with a polarity identifier 50 for identifying a polarity in orientation of the projection 13 , i.e. the axial end face to be up-sided when applying the nut 1 on the bolting element E 2 so that the flank 12 a , which is formed with the projection 13 , can serve as a thrust bearing side.
- the polarity identifier 50 may be a rise, emboss, print or seal.
- a continued polarity identifier or a number of raised polarity identifiers may be arranged symmetrical about a center axis for an improved appearance or facilitated piling.
- a polarity identifier may be provided on a lateral side or bottom of the nut body 10 .
- FIGS. 3A, 3B and 4 A, 4 B illustrate a screw fastening structure according to a second embodiment of the invention, in which also a conductive nut element E 1 is screwed onto an insulated conductive bolting element E 2 , which (E 2 ) also comprises: a stud bolt 20 formed with a male thread portion 21 (as screws of a male thread 22 ) and fixed by a welding 20 a to a grounded conductive portion B 1 of a vehicle body B; and an external coating layer L of a vehicular paint P including a paint coat 23 covering the stud bolt 20 .
- the nut element E 1 comprises an electrically conductive flanged hexagonal nut 3 constituted, as shown in FIG. 4A: with a hexagonal nut portion 30 having a female thread portion 31 (composed, as in FIG.
- each paint removing groove 36 is defined in plan by a straight side wall 36 a (at a backward end of a screw-in direction or tightening torque T) and an outwardly curved continuous side wall 36 b (at a forward end of the screw-in direction).
- the straight or curved side walls 36 a and 36 b of respective groove 36 each have (as in FIG. 3B) a straight downstream or curved upstream end face of an associated thread screw segment 37 , including a straight or curved triangular end face of an associated screw segment 37 a of the projection 33 .
- an obtuse-angled edge of the straight end face cuts part of the paint coat 23 to be removed and bites in a flank of the male thread 22 , as the nut 3 is screwed to produce a sufficient thrust force.
- each groove 36 is inclined downstream (i.e. in a forward sense), relative to the radial line L 1 , at an angle A of about 10°, having edge points 36 c and 36 d meeting the ridge 34 and the root 35 of the female thread 32 , respectively, and radially extends to have a radially outer end 36 e outside the thread 32 .
- the curved side wall 36 b continuously extends upstream (i.e.
- edge points 36 f and 36 g meeting the ridge 34 and the root 35 of the female thread 32 , respectively, joining at its upstream end with the outer end 36 e of the straight side wall 36 a , defining a paint removing space 38 outside a mating portion of the male thread 22 .
- the outer end 36 e of the straight side wall 36 a may preferably be located on or near the root 35 of the male thread 32 .
- the nut 3 which has the paint removing groove 36 crossing the male thread portion 31 , is adapted to peel and curl away an extra thickness of paint P when the paint coat 23 on the male thread portion 21 has an excessive thickness, and can be kept from galling or seizing on a way before seating, in addition to that the straight side wall 36 a inclined in a forward sense and the curved side wall 36 b of the paint removing groove 36 cooperate with each other to permit an enhanced performance for removal of extra paint P, with a maintained rake-out function under a slight reduced but still sufficient strength of the structure, thereby allowing for the nut 3 to be the more free from gall and seizure.
- the nut element E 1 and the bolting element E 2 may comprise other types of nut and coated bolt, respectively.
Abstract
Description
- The present invention relates to a screw fastening structure and a nut member, and in particular, to a screw fastening structure of the type that includes a male thread and a female thread to be electrically connected to each other, and a nut member of the type that has a female thread constituting a circuit element to be electrically connected to a mating male thread.
- In application to a grounding of a vehicle body, such a type of screw fastening structure as well as such a type of nut member tends to suffer an insulating paint coat that covers a male thread, thus intervening between the male thread and a mating female thread.
- As a countermeasure, there has been proposed a paint removing groove defining a thread profile as an edge for removing a paint layer, as disclosed in Japanese Utility Model Publication No. 57-147410.
- However, in the field of vehicle in which the painting is always improved, the provision of a paint removing groove sometimes fails to insure a neat removal of an intervening paint layer, resulting in remaining pieces of paint as electrical insulator pressed between male and female threads screwed under strong thrust. Such paint pieces may cause a non-conformity in current conduction between the screwed threads.
- The present invention has been achieved with such points in view.
- It therefore is an object of the invention to provide a screw fastening structure and a nut member, permitting a female thread to be electrically connected to a mating male thread covered with an insulating paint coat, with a secured current conduction through the paint coat.
- To achieve the object, an aspect of the invention provides a screw fastening structure comprising a conductive male thread having a first flank covered with an insulating paint coat, a conductive female thread having a second flank, and an electric contact interconnecting the first and second flanks through the paint coat.
- According to this aspect, the second flank of the conductive female thread is electrically connected to the first flank of the conductive male flank, by the electric contact interconnecting them through the paint coat, permitting a secured current conduction.
- The electric contact may preferably comprise a conductive projection formed on the second flank.
- Further to achieve the object, another aspect of the invention provides a nut member comprising a conductive female thread having a flank, and a conductive projection formed on the flank.
- Preferably, the nut member may further comprise a substantially straight nut body formed with the female thread and provided with a polarity identifier for identifying a polarity in orientation of the projection.
- The above and further objects and novel features of the present invention will more fully appear from the following detailed description when the same is read in conjunction with the accompanying drawings, wherein:
- FIGS. 1A, 1B, and1C illustrate a screw fastening structure according to a first embodiment of the invention, in which FIG. 1A is a section of a nut member of the screw fastening structure, FIG. 1B, a section of the screw fastening structure, and FIG. 1C, a detail of a structure within a circle “1C” of FIG. 1B;
- FIGS. 2A and 2B illustrate a fastening state of the screw fastening structure according to the first embodiment, in which FIG. 2A is a section of the screw fastening structure, and FIG. 2B, a detail of an essential portion of FIG. 2A;
- FIGS. 3A and 3B illustrate a screw fastening structure according to a second embodiment of the invention, in which FIG. 3A is a section of the screw fastening structure, and FIG. 3B, a detail of a structure within a circle “3B” of FIG. 3A; and
- FIGS. 4A and 4B illustrate a nut member of the screw fastening structure according to the second embodiment, in which FIG. 4A is a plan of the nut member, and FIG. 4B, a detailed section of an essential portion of FIG. 4A.
- There will be detailed below the preferred embodiments of the present invention with reference to the accompanying drawings. Like elements are designated by like reference characters.
- FIGS. 1A, 1B,1C and 2A, 2B illustrate a screw fastening structure according to a first embodiment of the invention, in which an electrically conductive nut element E1 (as a female thread component) is screwed onto an electrically insulated conductive bolting element E2 (as a male thread component), which (E2) has an anti-corrosive, well adhesive, scratch-resistive and electrically non-conductive external paint layer L extending over, and is fixed in an electrically connecting manner to, an electrically conductive portion B1 of a body B of a vehicle that (B1) has a number of electrically conductive or electrostatically active unshown vehicular components attached thereto, such as a piping and a heat shield plate, and that (B1) is electrically grounded.
- As shown in FIG. 1A, the nut element E1 comprises a hexagonal
straight nut 1 constituted with an electricallyconductive nut body 10 having a central straight hollow 10 a and afemale thread portion 11 tapped in a wall of the hollow 10 a. - In FIGS. 1B and 1C, the nut element E1 is screwed on the bolting element E2. As shown in FIG. 1B, the bolting element E2 comprises an electrically
conductive stud bolt 20 and apaint coat 23 put thereon as part of the paint layer L. Thebolt 20 has amale thread portion 21 died in a cylindrical side wall, and is contacted and directly welded at aproximal end 20 a thereof to the vehicle body portion B1. Themale thread portion 21 is wholly covered by thepaint coat 23, as thewelded bolt 20 is unmasked when paint is sprayed over the vehicle body portion B1 to thereby provide the paint layer L, because a masking costs high. - As better shown in FIG. 1C, the
female thread portion 11 of thenut 1 comprises a number of equally pitched spirally extending continuous screws of afemale thread 12 that has in its profile athrust bearing flank 12 a (at a near side to theproximal end 20 a or an upside in the figure) and anopposing flank 12 b (at a far side from theproximal end 20 a or a downside in the figure), and themale thread portion 21 of thebolt 20 comprises a larger number of equally pitched spirally extending continuous screws of amale thread 22 that has in its profile athrust bearing flank 22 a (at a near side to theproximal end 20 a or a downside in the figure) and anopposite flank 22 b (at a far side from theproximal end 20 a or an upside in the figure). - When the
nut 1 applied on thebolt 20 as in FIG. 1B is driven with torque (collectively to be T), the thrust bearingflanks male threads paint coat 23 intervening therebetween. - To this point, as shown in FIGS. 1C and 2B, the
female thread 12 has aprojection 13 provided as an electrical contact element on thethrust bearing flank 12 a, substantially at a middle position betweenflat ridges 14 and 24 (or flat orround roots 15 and 25) of the male andfemale threads vertex 13 a of an obtuse angle near or close to a right angle or within a preferable angle range of 90° to 120°. The obtuse-angled projection 13 is tapped and trimmed, together with theflank 12 a. - The
projection 13 breaks through an intervening part of thepaint coat 23 and bites into a substantiallystraight slope 22 c of thethrust bearing flank 22 a, as illustrated in FIG. 1C where thenut 1 is tightened with an increasing magnitude of torque T by virtue of a thrust source (e.g. B1+L+W in FIG. 1B) acting thereon. As a result, an exposed underside orbottom 10 b of thebody 10 ofnut 1 is electrically connected to the conductive portion B1 of vehicle body B, via thethread 12 offemale thread portion 11, theprojection 13 offlank 12 a, thethread 22 ofmale thread portion 21, a body of thebolt 20, and thewelded end 20 a ofbolt 20. - As will be seen from FIG. 2B, the
projection 13 spirally continuously extends along theridge 14 of thefemale thread 12, with a projection dimension to be set, as a height of thevertex 13 a relative to a substantiallystraight slope 12 c of thethrust bearing flank 12 a, to be smaller than a designed fitting clearance C between the female andmale threads paint coat 23. For example, the projection dimension may be approx. 0.05 mm, as the nominal diameter D of thenut 1 is a 8 mm. - The obtuse angle of the
vertex 13 a is defined between an ascendingly radially extendingthrust bearing face 13 b and a substantially axially extending cut-inface 13 c of theprojection 13, in which thethrust bearing face 13 b has an ascending angle set (to be about 10° in this case) relative to a radial reference plane S, in consideration of the service life of a tap (not shown) having a special envelope form to or reverse form of thefemale thread 12 which includes theprojection 13, and the productivity ofnut 1, as well as for qualities to be secured such as of configuration, dimensions and applicability of and current conduction and defined cutting by theprojection 13. If the obtuse angle is excessive (e.g. >120°), there develops an increased loss of torque T when fastening, resulting in a reduced thrust force F remaining to be effective. If that angle be under the range (e.g. <90°), there may be caused an earlier abrasion of a whetstone for the tap. - In FIG. 2A, after application of an electrically conductive flat washer or terminal W, the
nut 1 is applied on thebolt 20 and traveling on a way of screw-down without significant thrust forces, where theprojection 13, which has a smaller projection height to theflank 12 a offemale thread 12 than the fitting clearance C between thenut 1 and the weldedbolt 20, is substantially free from interference with theflank 22 a ofmale thread 22 of thebolt 20 so that thenut 1 kept from galling and seizing, while thepaint coat 23 on a region of male thread screws where thenut 1 has traveled is substantially maintained (i.e. not scraped off) and permits an anti-corrosive property to be secured. - In FIG. 1B, the
nut 1 is seated on the terminal W with a sufficient thrust force F produced to act thereon for strong fixation to the vehicle body B, which force F has caused theprojection 13 on theflank 12 a offemale thread 12 to bite in theflank 22 a ofmale thread 22, so that thisflank 22 a is electrically connected with thatflank 12 a, allowing for thenut 1 to be employed as a grounding component. - The
projection 13 is formed on thethrust bearing flank 12 a of thefemale thread 12, continuously along theridge 14, and when thenut 1 is seated on the terminal W, it (13) has bitten in theflank 22 a ofmale thread 22 over length of its spiral, permitting a conforming current conduction therebetween, with an enhanced grounding performance, as well as an enhanced anti-loosening performance due to the biting. - Incidentally, the
straight nut body 10 is provided on the top face with apolarity identifier 50 for identifying a polarity in orientation of theprojection 13, i.e. the axial end face to be up-sided when applying thenut 1 on the bolting element E2 so that theflank 12 a, which is formed with theprojection 13, can serve as a thrust bearing side. Thepolarity identifier 50 may be a rise, emboss, print or seal. A continued polarity identifier or a number of raised polarity identifiers may be arranged symmetrical about a center axis for an improved appearance or facilitated piling. A polarity identifier may be provided on a lateral side or bottom of thenut body 10. - FIGS. 3A, 3B and4A, 4B illustrate a screw fastening structure according to a second embodiment of the invention, in which also a conductive nut element E1 is screwed onto an insulated conductive bolting element E2, which (E2) also comprises: a
stud bolt 20 formed with a male thread portion 21 (as screws of a male thread 22) and fixed by a welding 20 a to a grounded conductive portion B1 of a vehicle body B; and an external coating layer L of a vehicular paint P including apaint coat 23 covering thestud bolt 20. - In the second embodiment, however, the nut element E1 comprises an electrically conductive flanged
hexagonal nut 3 constituted, as shown in FIG. 4A: with ahexagonal nut portion 30 having a female thread portion 31 (composed, as in FIG. 3B, of screws of afemale thread 32 that is identical to thefemale thread 12 of the first embodiment and formed with aprojection 33 at a middle position between associatedthread ridges thread roots 35, 25) and acircular bottom flange 39 which provides an increased area for thrust collection and concurrently serves as a polarity identifier; and with three paint removingstraight grooves 36 formed (with a tangential open width H of about 2 mm between a radial line L1 and a paralleled line L2 as in FIG. 4B [although the line L2 may also be a radial.]) along height of the nut 3 (thus crossing thefemale thread portion 31 and interrupting each screw of the female thread 32) and arranged symmetrical at angular intervals of approx. 120° about a center axis of thenut 3. - As best shown in FIG. 4B, each
paint removing groove 36 is defined in plan by a straight side wall 36 a (at a backward end of a screw-in direction or tightening torque T) and an outwardly curved continuous side wall 36 b (at a forward end of the screw-in direction). As a respective screw of thefemale thread 32 is divided by the threegrooves 36 into threescrew segments 37 thereof, the straight or curved side walls 36 a and 36 b ofrespective groove 36 each have (as in FIG. 3B) a straight downstream or curved upstream end face of an associatedthread screw segment 37, including a straight or curved triangular end face of an associatedscrew segment 37 a of theprojection 33. At a downstream of theprojection screw segment 37 a, an obtuse-angled edge of the straight end face cuts part of thepaint coat 23 to be removed and bites in a flank of themale thread 22, as thenut 3 is screwed to produce a sufficient thrust force. - The straight side wall36 a of each
groove 36 is inclined downstream (i.e. in a forward sense), relative to the radial line L1, at an angle A of about 10°, having edge points 36 c and 36 d meeting theridge 34 and theroot 35 of thefemale thread 32, respectively, and radially extends to have a radiallyouter end 36 e outside thethread 32. The curved side wall 36 b continuously extends upstream (i.e. in a backward sense), having edge points 36 f and 36 g meeting theridge 34 and theroot 35 of thefemale thread 32, respectively, joining at its upstream end with theouter end 36 e of the straight side wall 36 a, defining apaint removing space 38 outside a mating portion of themale thread 22. - The
outer end 36 e of the straight side wall 36 a may preferably be located on or near theroot 35 of themale thread 32. - The
nut 3, which has thepaint removing groove 36 crossing themale thread portion 31, is adapted to peel and curl away an extra thickness of paint P when thepaint coat 23 on themale thread portion 21 has an excessive thickness, and can be kept from galling or seizing on a way before seating, in addition to that the straight side wall 36 a inclined in a forward sense and the curved side wall 36 b of thepaint removing groove 36 cooperate with each other to permit an enhanced performance for removal of extra paint P, with a maintained rake-out function under a slight reduced but still sufficient strength of the structure, thereby allowing for thenut 3 to be the more free from gall and seizure. - In this respect, seven samples {circumflex over (1)} to {circumflex over (7)} each constituted as the
nut 3 were subjected to a screw-in test for an inspection of screw-up torque (to a criterion of 50 kg • cm or less) up to a seating and for a grounding nature in a seating state, to have results listed in Table-1 below. For the grounding nature, given results are after decision by visual inspection for a contact (criterion: to be a metal touch) between a thrust bearing flank of afemale thread 32 ofnut 3 and an exposed region of a thrust bearing flank of amale thread 22 of a weldedbolt 20, as this flank was covered with a 20 μ cation paint coat. - As will be seen from the Table-1, the samples {circumflex over (1)} to {circumflex over (7)} were all under the criterion limit of 50 kg • cm in screw-in torque, with a proof of no need for a significant magnitude of torque before a seating of
nut 3, in addition to a proven adaptivity for application ofnut 3 to a grounding.TABLE 1 Screw-in torque, Smpl Criteria kg-cm Grounding nature {circle over (1)} ≦50 kg-cm, metal touch 3 Conforming {circle over (2)} do. 4 do. {circle over (3)} do. 7 do. {circle over (4)} do. 4 do. {circle over (5)} do. 5 do. {circle over (6)} do. 6 do. {circle over (7)} do. 4 do. - It will be seen that in the foregoing embodiments the nut element E1 and the bolting element E2 may comprise other types of nut and coated bolt, respectively.
- The contents of Japanese Patent Application No. 10-129926 are incorporated herein by reference.
- While preferred embodiments of the present invention have been described using specific terms, such description is for illustrative purposes, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.
Claims (17)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10-129926 | 1998-05-13 | ||
JP10129926A JPH11325023A (en) | 1998-05-13 | 1998-05-13 | Nut |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020002006A1 true US20020002006A1 (en) | 2002-01-03 |
US6386927B2 US6386927B2 (en) | 2002-05-14 |
Family
ID=15021841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/311,365 Expired - Fee Related US6386927B2 (en) | 1998-05-13 | 1999-05-13 | Screw fastening structure and nut member |
Country Status (4)
Country | Link |
---|---|
US (1) | US6386927B2 (en) |
EP (1) | EP0962665B1 (en) |
JP (1) | JPH11325023A (en) |
DE (1) | DE69905977T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104012195A (en) * | 2011-11-11 | 2014-08-27 | 恩德莱斯和豪瑟尔两合公司 | Housing for field device |
US20150155640A1 (en) * | 2012-06-29 | 2015-06-04 | Pfisterer Kontaktsysteme Gmbh | Shearable screw, associated system and device for screw-connecting electrical conductors with such a shearable screw |
WO2017074369A1 (en) * | 2015-10-29 | 2017-05-04 | Hewlett-Packard Development Company, L.P. | Screw boss structure |
CN107091270A (en) * | 2017-06-23 | 2017-08-25 | 武汉捷众汽车零部件有限公司 | A kind of new automobile grounding nut |
KR101993774B1 (en) * | 2019-03-18 | 2019-09-24 | 김대현 | Apparatus for sensing a loosening of the nut |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3554306B2 (en) * | 2001-10-11 | 2004-08-18 | 株式会社メイドー | Bolt, manufacturing die, and method of manufacturing the bolt |
JP4155836B2 (en) * | 2003-02-10 | 2008-09-24 | 日産自動車株式会社 | Rush adjuster in valve gear |
DE102006056065B4 (en) * | 2006-11-20 | 2018-08-09 | Newfrey Llc | Pre-assembled contacting unit and mounting arrangement |
JP5351568B2 (en) * | 2009-03-13 | 2013-11-27 | 本田技研工業株式会社 | Fuel pipe fixing structure |
EP2464806B1 (en) * | 2009-08-13 | 2013-05-29 | Gerhard Geiger GmbH & Co. | Gear mechanism |
JP5870445B2 (en) * | 2011-11-18 | 2016-03-01 | ポップリベット・ファスナー株式会社 | Pipe fitting with earth function |
JP6261853B2 (en) * | 2012-11-22 | 2018-01-17 | イワタボルト株式会社 | Earth nut |
US20140259627A1 (en) * | 2013-03-15 | 2014-09-18 | Apple Inc. | Self-threading fastener |
JP2015137700A (en) * | 2014-01-22 | 2015-07-30 | トヨタ自動車株式会社 | earth bolt |
CN108006051B (en) * | 2017-12-15 | 2023-12-08 | 北京理工大学 | Anti-loose thread pair and anti-loose thread piece |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3517717A (en) * | 1968-05-03 | 1970-06-30 | Reed Rolled Thread Die Co | Self-locking screws |
CA954430A (en) * | 1970-04-03 | 1974-09-10 | Dumont Aviation Associates | Self-locking screw |
FR2311215A1 (en) * | 1975-05-15 | 1976-12-10 | Lazarew Michel | Self cleaning hexagonal nut - has U-shaped groove parallel to axis and ends chamfered (NL171176) |
US4252168A (en) * | 1979-05-16 | 1981-02-24 | The Lamson & Sessions Co. | Thread convolution |
JPS57147410A (en) | 1981-03-05 | 1982-09-11 | Inoue Japax Res Inc | Magnetic filter material |
US4826377A (en) * | 1981-04-27 | 1989-05-02 | Holmes Horace D | Self-locking fastener and tool for making same |
US5221170B1 (en) * | 1986-09-15 | 1995-08-01 | Nylok Fastener Corp | Coated threaded fasteners |
JPH06210218A (en) | 1993-01-14 | 1994-08-02 | Honda Motor Co Ltd | Masking member |
US5672037A (en) * | 1994-11-01 | 1997-09-30 | Iwata Bolt Kabushiki Kaisha | Loosening and dislodging preventing screw |
US5663015A (en) * | 1995-10-18 | 1997-09-02 | Hawker Energy Products, Inc. | Sealant gasketing plastic nut battery terminal seal |
US5685680A (en) * | 1996-05-02 | 1997-11-11 | Nylok Fastener Corporation | Coated threaded fasteners with coating-free crests |
US5944465A (en) * | 1997-08-04 | 1999-08-31 | Janitzki; Bernhard M. | Low tolerance threaded fastener |
-
1998
- 1998-05-13 JP JP10129926A patent/JPH11325023A/en active Pending
-
1999
- 1999-05-12 EP EP99109551A patent/EP0962665B1/en not_active Expired - Lifetime
- 1999-05-12 DE DE69905977T patent/DE69905977T2/en not_active Expired - Fee Related
- 1999-05-13 US US09/311,365 patent/US6386927B2/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104012195A (en) * | 2011-11-11 | 2014-08-27 | 恩德莱斯和豪瑟尔两合公司 | Housing for field device |
US20140284097A1 (en) * | 2011-11-11 | 2014-09-25 | Endress + Hause GmbH + Co. KG | Field Device |
US9288923B2 (en) * | 2011-11-11 | 2016-03-15 | Endress + Hauser Gmbh + Co. Kg | Field device |
US20150155640A1 (en) * | 2012-06-29 | 2015-06-04 | Pfisterer Kontaktsysteme Gmbh | Shearable screw, associated system and device for screw-connecting electrical conductors with such a shearable screw |
US9472865B2 (en) * | 2012-06-29 | 2016-10-18 | Pfisterer Kontaktsysteme Gmbh | Screw connecting electrical conductors with a shearable screw |
WO2017074369A1 (en) * | 2015-10-29 | 2017-05-04 | Hewlett-Packard Development Company, L.P. | Screw boss structure |
CN107091270A (en) * | 2017-06-23 | 2017-08-25 | 武汉捷众汽车零部件有限公司 | A kind of new automobile grounding nut |
KR101993774B1 (en) * | 2019-03-18 | 2019-09-24 | 김대현 | Apparatus for sensing a loosening of the nut |
Also Published As
Publication number | Publication date |
---|---|
US6386927B2 (en) | 2002-05-14 |
EP0962665A1 (en) | 1999-12-08 |
DE69905977T2 (en) | 2003-11-06 |
JPH11325023A (en) | 1999-11-26 |
DE69905977D1 (en) | 2003-04-24 |
EP0962665B1 (en) | 2003-03-19 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FUSE RASHI CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAYAMA, RYOICHI;NAKANO, SHINJI;REEL/FRAME:010105/0634;SIGNING DATES FROM 19990622 TO 19990702 Owner name: NISSAN MOTOR CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAYAMA, RYOICHI;NAKANO, SHINJI;REEL/FRAME:010105/0634;SIGNING DATES FROM 19990622 TO 19990702 |
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FPAY | Fee payment |
Year of fee payment: 4 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20100514 |