CA1126061A - Fastener and drive system - Google Patents
Fastener and drive systemInfo
- Publication number
- CA1126061A CA1126061A CA303,265A CA303265A CA1126061A CA 1126061 A CA1126061 A CA 1126061A CA 303265 A CA303265 A CA 303265A CA 1126061 A CA1126061 A CA 1126061A
- Authority
- CA
- Canada
- Prior art keywords
- flange
- fastener
- fastener member
- shank
- stud
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000013011 mating Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001154 acute effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000012771 pancakes Nutrition 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 241000699655 Akodon torques Species 0.000 description 1
- 102100037114 Elongin-C Human genes 0.000 description 1
- 101001011859 Homo sapiens Elongin-A Proteins 0.000 description 1
- 101001011846 Homo sapiens Elongin-B Proteins 0.000 description 1
- 101000881731 Homo sapiens Elongin-C Proteins 0.000 description 1
- 101000836005 Homo sapiens S-phase kinase-associated protein 1 Proteins 0.000 description 1
- NPPQSCRMBWNHMW-UHFFFAOYSA-N Meprobamate Chemical compound NC(=O)OCC(C)(CCC)COC(N)=O NPPQSCRMBWNHMW-UHFFFAOYSA-N 0.000 description 1
- 241000428533 Rhis Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- FAPWYRCQGJNNSJ-UBKPKTQASA-L calcium D-pantothenic acid Chemical compound [Ca+2].OCC(C)(C)[C@@H](O)C(=O)NCCC([O-])=O.OCC(C)(C)[C@@H](O)C(=O)NCCC([O-])=O FAPWYRCQGJNNSJ-UBKPKTQASA-L 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000789 fastener Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
- F16B35/065—Specially-shaped heads with self-countersink-cutting means
-
- 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
- F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
- F16B23/0076—Specially shaped nuts or heads of bolts or screws for rotations by a tool causing slipping of the tool in loosening rotation, i.e. disabling unscrewing unless another tool is used
-
- 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
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
- F16B35/042—Specially-shaped shafts for retention or rotation by a tool, e.g. of polygonal cross-section
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Insertion Pins And Rivets (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
Abstract of the Disclosure A fastener member having a shank portion from a radially ex-tending flange. The surface of the flange opposing the shank including generally radially extending rib-like surfaces which serve as the means to drive the fastener in place. The fastener could be a double-ended stud in which case the ribs could serve to lock the fastener from backing out of the workpiece after a secondary work surface has been clamped over the flange.
Description
FASTENER AND DRIVE SYSTEM
Background of the Invention 11.
Double-ended stud-like fasteners consisting of a machine screw '~
thread on one end, a pancakc-type flange or head in the midclle and a F
special thread tapping screw at the other end are comrnonly used in en- `~
vironments where the primary supporting surface is of a plastlc-type material with securement therein being a blind application, 'rypical applications of this type are those of autotnotive where plastic components are provided with boss-like protul~erances having preformed bores in order to accept the tapping thread end of the stud.
~he studs are usually first driven into the plastic bosses with a stud r driver leaving the machine screw end to be inserted later through clearance holes in sheet metal workpieces. Nuts are then used to clamp the sheet metal against the pancake head of the double-ended stud which puts all the load on the machine screw end of the stud and eliminates any added stress to the plastic during installation.
6~
A typical manner o~ driving sucll double-en(led studs has been to utilize the upwardl~ extending threadecl shank allcl transmit torque to the fasteners by means of a clluck grasping the threaclecl section. Another method utilizcs tlle outer periphery Or the flange to drive the fastener.
5 Such applications and tools tend to be signiEicantly greater in diameter than the diameter of the flange and/or the boss which the stud is to be associated with. In many such applications, the bosses are in confined areas and size of the tool is a definite factor in efficiently driving such fas teners .
In addition to the application or driving problems associated with prior art systems, a substantial problem exists in securing the fastener from backing out or rotation tending to remove after the fastener has been installed. For a variety of reasons, the clamping nuts may have to be removed and/or the sheet metal removed from the installation.
When torque is applied to the system to remove the nut, it is also ap-plied to the stud tending to loosen or remove the stud itself from the plastic. A number of techniques have been suggested to elirninate this tendency to remove the stud when the nut is removed. Adhesives, special thread forms, locking means beneath the pancake head or a t combination of special configurations of boss and pancake head have been suggested. However, the prior art suggestions are either costly, cumbersome or contributory to further deterioration and stressing of the plastic during installation.
This invention also relates to fasteners generally having a head configuration designed to prevent unauthorized removal. The presence 6~
o.~ any hiyh profile scr~w off~rs the possibility th~t a tight clamping or wrench.ing can be ob-tained on the periphery of the head thus leading to unauthoriz~d removal.
The applicant has i.ts co-pendin~ appl.i.cation Serial Mo.
329,543 in which subject matter closely rel~ted to this inventlon is descrlbed clnd cL~Iimed.
Summary of the I ventiorl 'rhe present invention is concerned w;th a double-ended stud having dual purpose ribs formed on the upper surface of a pancake-type flange and a tool for inserting such a stud in an assoc;ated work surEace.
Radially extending, sharp edged, ribs on tlle upper surface of the flange function to drive the fastener and to embed in the undersurïace of a secondary work plate clamped over the stud/boss combination securing the fastener against retrograde movement o-f the stud.
The invention is also concerned with a low profi'le tamperproof head style incorporating similar ribs on the upper surface of the flange and a stud centering shank.
A tool particularly designed to insert such a dou'ble~ended fastener or tamperproof fastener in a workpiece includes an end surface with a plurality of radially extending abutment surfaces formed the~rein adapted to engage the ribs on the flange. An axial bore in the too'l re-ceives the upwardly extending stud shank durirlg lhe driving 50 that the end surface of the tool may freely contact the flange.
In contrast with prior art methods of applying double~ended studs~
the stud and tool described herein permit the axial driving pressure to be carefully control'led and confined while the fastener is stabilized Ol' centered in a properly fixtured driving tool. I'he axial driving pressure ~ , I , ~L2~06~
is thus controlled and concentrated to maximize the efficient application of the torque transmitting pressures which are distributed over the sur-face of the flange rather than applied to the smaller diameter o~ the up-wardly e~tetlcling shanlc.
'rhe tool is designecl so that its mating end surface is substan-tially equal to the flange diameter of the stud. 'rhis allows the tool to be used in confined areas and eliminates any contact of the tool with the plastic itself.
Ihe ribs formed on the upper surface of the flange should include at least a primary abutment surface extending perpendlcular to the flange surface and a secondary surface joining the primary abutment surface at a sharp apex. A preferred embodiment of the invention shows the secon-dary surface to be a sloped, camming surface.
It is, therefore, an object of the present invention to provide an improved double-ended stud with means to prevent removal oE the stud upon removal of a clamping nut associated thereon.
~ further object of the invention is to provide a fastener with an improved means for driving into a workpiece.
Yet another object of the invention is to provide a double-ended stud with a single structural improvement that serves to both irnprove the driving and locking characteristics of the stud.
Yet another object of the invention is to provide a driving tool for association with the double-ended stud of the present invention and with fasteners having tamperproof features.
~1~6~6~
I An~l.(lv~n~:a~e orlllc(1~sign o:f~llel)1c;elllirlv~lltio~lis its.~ y ~o transmitt~lqu~ ~fri~ie;ltly an(~rfc~ctiv~ly ~o~llo~vl)rofilc, tamp~r-proofhead on perp~n(licul~rtor~ue r~c~iving.surfaces o~r~l~tivel~ low ; height.
In one aspect, the invention comprehends a fasteller rem~er which includes a first stud shank and a second stud shank co-axially arranged with an i.ntegral radially extendlng thin flange intermediate thereof. The Eirst s-tud shank includes a helical thread formed thereon ancl incorporates means to form a mating internal thread in a preformed bore in an associated work surface. The flange defines a lower surface adjacent the first shank and an upper surface adjacent the second stud shan]c.
An upstanding protuberance means is formed on the upper surface of the flange with the protuberance means comp.rising radially extending ribs each having a primary rotary driving surface extending upwardly perpendicularly from the upper surEace of the flangc. A secondary surface extends angularly upwardly from the flange upper surface toward the primary driving surface, and the secondary surface provides means by which a mating tool can be cammed gently downward to bring the end of the tool into engagement with the flange and to bring a drive surface of the tool into engagement with each primary driving surface of the fastener member.
The invention further comprehends a tool for driving a fastener having a radially extending flange in-termediate a thread-ed shank and co-axially arranged stud-like projections, by applying rotary torque to protuberance driving means ~n ~he ~lpper surface of the radially extending flange. The tool comprises a cylindrical body with an outer diameter substantially e~ual to the diameter of a flange on an associated double-ended stud.
An axial bore extends from a forward, flange engaging end surface of t.he tool, and the hore is dimensioned so as to be slightly greater in diameter and length of the stud protrusion extending upwardly from the flange on the associated fastener. 'l`he ~"~
~ 5 -~z~
-~xtremity of the body opposite the flange enyaging end surface includes means to transmit torque to the tool, and the flanye en-gaging end surface includes a plurality of abutment surfaces adapt-ed to transmit tc)rqu~ to associated protuberances on the flange of the double-ended stud.
In a still further embodiment, the invention comprehends a fastener member with a low profile, tamperproof head having a first and second s-tud shan~c e~tending axially therefrom, said first stud shank haviny threads with a predetermined thread pitch, and incorporating means to form a mating internal thread in a pre-formed bore with the head comprising a radially extending, annular, thin flange which has a thickness not appreciably greater than said predetermined thread pitch, thereby forming a flat, lower bearing surface and an upper, driving surface. The upper surface includes lS flat surface regions parallel to the lower surface which form a substantial portion of the upper surEace. Three equally spaced generally radially extending protuberances are formed on the upper surface and extend upwardly therefrom, each protuberance including an abutment sur~ace extending perpendiculaxly upwardly from -the upper surface intersecting with a camming surface which provides means to only accept and transmit a rotary force in one direction of rotation. Each protuberance extends upwardly a short distance not generally exceeding the thickness of the ~lange, and the second stud shank cGmprises a centrally located annular cylindrical boss, with smooth walls, extending upwardly from the upper surface and has a diameter substantially less than the diameter of ~he flange, and a height not substantially greater than the thic~ness of the flange, which provides centering and stabilizing means during the driving of the fastener. The flat upper surface region, the smooth surfaced short cylindrical boss and the three equally spaced prot-uberances, in combination~ create means to accurately and predict-ably align a mating ~ri~lng tool wlth the head of the fastener, to insure that sufficisnt torque is applied to the relatively short abutment surface of the protuberances so that the low profile of -the head may be maintained, thus insurincl that th~
fastener member will not acc~pt unauthori~ed removal forces.
Other obj~cts an~ advantacJes of the present invention will become apparent from the follc)winq clescriptlon and the ac company ln q (1 r~, l ncls .
13rier J)cgcri~ ;on of tl-le l)r.lwir _________ __ li'igule 1 is a siclc clevaliol1al vie~v Or the doublc-ell(le(l slucl embodying the featlures Or tlle invclltioll, ]' i~lI`Ci! 2 i ~ pl.lll vic~ O r tl~ , - 2 L0 of l:~`igure l.
Figure 3 is a sidc view, in parl.;al sectioll, of the stu(:l ~nember inserted in a boss S~II racc thr ougll thc u.C;e Or a part;cularly clesignecl tool.
I~igure 4 is an elllargcd side view, in ~-artial section, of all as-sembly using the double-enclcd stud inserl;ccl in a ~vorhl)iec c all(l sllc)willa a nut rncn)ber c~a~ irlg a seconcl<lry work }~].ate o~e~r tllc flange.
liigure 5 i~s an cnd view oi the tool tal;en from its work colltact;ng~
surface end.
Ii`igul e G is all clc~v~tiollal vic-~, in ~)a1~lial scctic~l-, Or tl~c t~-ol (~1`
the inventiotl in association with a fastener of modiricd clesign.
. .", .
3~Z6~i~6~
Ii'ig-lre 7 i9 a Lol) pl~n v.ie~v of tl~e fa.c;tencl of mocliie(l clesign s llo~ Ti'io~ c (`~ .
I~eser.l_~ll of the~ t`e.r.~ ed l!`nlb_linlc?nt.s '.rur~ g first to .l~ig.rs. 1 alncl 2, the d()~lble-elldecl sL~Icl 10 of the present invelltioll will illelucle a rirst, lower stud shank 12 eo-a~;ially arranged with a seeontl, upper stucl shank 30 witll arl integralJ paneake-type flange 18 positiolled interll~ecliatc? the sh;llll;s. ~rhc? first stllcl section 12 is designecl to be assoeiatecl ~Vitll a blinci bore in a wo:rkpieee strueture, sueh as a p].ast.ie boss. With this in mind, it .i~s preferably provided with a threacl eonvolutiotl 1~ Or rather sllarp erested, spaeed threads. A thread elltting slot 16 i9 formed irl the extrelnity o Lhe ~serew to faeilitate the anellorirlg~ embedmerlt Or this Iirst shallk ~vithin the bore of tlle primarSr ~vo~ st:rueturc?. It sllo-lld be llotecl, 1lO\~rL~C?1~, Lll.lt C?~'C?II
. though a thread euttln~ slot is shown in the preIerre(l elnboclimerlt, a number o alternate eonfigurations ean be used to properl~y form or generate an internal threacl in the pr.irrlary~work st:rueture.
~ radially extencling flange 1~3 is eonigured to provide a: generally flat undersurfaee 22, aclJaeent the .first stud SC'C~tlC~ll 12j. and an upper suraee 20 adjaeent the seeoncl stud seetion 30. 'rhe upper su.rfaee 20 : ~ ineludes a pluarlity o generally radially extendingS protuberan~es ~formed on an other~vise flat uppc.?r surraee. 'rhese protubeIanees fornl an ilil~
portant ~speet of the inventloll an(3 their dual purpose will be cleseribecl in detail further herein.
'rhe preferrl?c3 e~llboclirr~ent (~f tlle Inventioll sho~vs thl`e(` I`i~ iC
members extending generally radially of the a:Yis of the fastener. 'rlle O~L
rlenlb(~I~ Z~ i1l ( o~ ;e ~ t~ O ~Irf;lc t ~(;, extending sul)sIc~ ially perl)en(licu'Lar lo tlle t'ellla;ll;llg ~urîace regi(~
of the uppel Elange surl'aec? 20. The su~races ~ l'11 also e~;tt n-I radial-ly oE t'tlt~ cis Or llltl rcl~tt~ller to ,I~ ve I~ ;ilt~ t~f~ y Or tllt.~
rotary t'orc~e applie~l lo the Fastenc~r. l\ secollclary .sutface 2d, in lhe form of a ram~, extentls upwardly at an acutt? angle to tlle upper ~Iange surEace and to\varcl llle p1ane of tht~ prilllary d~ c~ ~c~ulrrace 2(`., 'I'lle eamming surfact? 28 pe~rmits an associated driver, such as 46, to be plaeed in operative position witb a gradua] and "soft" engagement onto the flange surfaee 20, rrhe preferred embodin~etlt disclose~s tlle cam- -ming surface as directly interseeting the abutmeIlt surEace 26; ho\vever, it should be understootl that intermediate sulraces cou'ld be provided of any variety Or conEiglIratiolls aIlcl still eollle \~ itllin tlle hl oad s~ope c.r this invention.
A reference to Figs. 3 and 5 will show a tool for drivmg l!le above-described fastener and the typica'l applicatioIl for such a fastener~.
A typieal use for double-ended fasteIler6 of the t~yI~e described is Lo ~; aehieve a meaIls to clamp a second~r~i wo1k strllcture or plale-like tk?~
viee to a molded plaslie strueture. Common aF)plieations Eor doub1e-.
Background of the Invention 11.
Double-ended stud-like fasteners consisting of a machine screw '~
thread on one end, a pancakc-type flange or head in the midclle and a F
special thread tapping screw at the other end are comrnonly used in en- `~
vironments where the primary supporting surface is of a plastlc-type material with securement therein being a blind application, 'rypical applications of this type are those of autotnotive where plastic components are provided with boss-like protul~erances having preformed bores in order to accept the tapping thread end of the stud.
~he studs are usually first driven into the plastic bosses with a stud r driver leaving the machine screw end to be inserted later through clearance holes in sheet metal workpieces. Nuts are then used to clamp the sheet metal against the pancake head of the double-ended stud which puts all the load on the machine screw end of the stud and eliminates any added stress to the plastic during installation.
6~
A typical manner o~ driving sucll double-en(led studs has been to utilize the upwardl~ extending threadecl shank allcl transmit torque to the fasteners by means of a clluck grasping the threaclecl section. Another method utilizcs tlle outer periphery Or the flange to drive the fastener.
5 Such applications and tools tend to be signiEicantly greater in diameter than the diameter of the flange and/or the boss which the stud is to be associated with. In many such applications, the bosses are in confined areas and size of the tool is a definite factor in efficiently driving such fas teners .
In addition to the application or driving problems associated with prior art systems, a substantial problem exists in securing the fastener from backing out or rotation tending to remove after the fastener has been installed. For a variety of reasons, the clamping nuts may have to be removed and/or the sheet metal removed from the installation.
When torque is applied to the system to remove the nut, it is also ap-plied to the stud tending to loosen or remove the stud itself from the plastic. A number of techniques have been suggested to elirninate this tendency to remove the stud when the nut is removed. Adhesives, special thread forms, locking means beneath the pancake head or a t combination of special configurations of boss and pancake head have been suggested. However, the prior art suggestions are either costly, cumbersome or contributory to further deterioration and stressing of the plastic during installation.
This invention also relates to fasteners generally having a head configuration designed to prevent unauthorized removal. The presence 6~
o.~ any hiyh profile scr~w off~rs the possibility th~t a tight clamping or wrench.ing can be ob-tained on the periphery of the head thus leading to unauthoriz~d removal.
The applicant has i.ts co-pendin~ appl.i.cation Serial Mo.
329,543 in which subject matter closely rel~ted to this inventlon is descrlbed clnd cL~Iimed.
Summary of the I ventiorl 'rhe present invention is concerned w;th a double-ended stud having dual purpose ribs formed on the upper surface of a pancake-type flange and a tool for inserting such a stud in an assoc;ated work surEace.
Radially extending, sharp edged, ribs on tlle upper surface of the flange function to drive the fastener and to embed in the undersurïace of a secondary work plate clamped over the stud/boss combination securing the fastener against retrograde movement o-f the stud.
The invention is also concerned with a low profi'le tamperproof head style incorporating similar ribs on the upper surface of the flange and a stud centering shank.
A tool particularly designed to insert such a dou'ble~ended fastener or tamperproof fastener in a workpiece includes an end surface with a plurality of radially extending abutment surfaces formed the~rein adapted to engage the ribs on the flange. An axial bore in the too'l re-ceives the upwardly extending stud shank durirlg lhe driving 50 that the end surface of the tool may freely contact the flange.
In contrast with prior art methods of applying double~ended studs~
the stud and tool described herein permit the axial driving pressure to be carefully control'led and confined while the fastener is stabilized Ol' centered in a properly fixtured driving tool. I'he axial driving pressure ~ , I , ~L2~06~
is thus controlled and concentrated to maximize the efficient application of the torque transmitting pressures which are distributed over the sur-face of the flange rather than applied to the smaller diameter o~ the up-wardly e~tetlcling shanlc.
'rhe tool is designecl so that its mating end surface is substan-tially equal to the flange diameter of the stud. 'rhis allows the tool to be used in confined areas and eliminates any contact of the tool with the plastic itself.
Ihe ribs formed on the upper surface of the flange should include at least a primary abutment surface extending perpendlcular to the flange surface and a secondary surface joining the primary abutment surface at a sharp apex. A preferred embodiment of the invention shows the secon-dary surface to be a sloped, camming surface.
It is, therefore, an object of the present invention to provide an improved double-ended stud with means to prevent removal oE the stud upon removal of a clamping nut associated thereon.
~ further object of the invention is to provide a fastener with an improved means for driving into a workpiece.
Yet another object of the invention is to provide a double-ended stud with a single structural improvement that serves to both irnprove the driving and locking characteristics of the stud.
Yet another object of the invention is to provide a driving tool for association with the double-ended stud of the present invention and with fasteners having tamperproof features.
~1~6~6~
I An~l.(lv~n~:a~e orlllc(1~sign o:f~llel)1c;elllirlv~lltio~lis its.~ y ~o transmitt~lqu~ ~fri~ie;ltly an(~rfc~ctiv~ly ~o~llo~vl)rofilc, tamp~r-proofhead on perp~n(licul~rtor~ue r~c~iving.surfaces o~r~l~tivel~ low ; height.
In one aspect, the invention comprehends a fasteller rem~er which includes a first stud shank and a second stud shank co-axially arranged with an i.ntegral radially extendlng thin flange intermediate thereof. The Eirst s-tud shank includes a helical thread formed thereon ancl incorporates means to form a mating internal thread in a preformed bore in an associated work surface. The flange defines a lower surface adjacent the first shank and an upper surface adjacent the second stud shan]c.
An upstanding protuberance means is formed on the upper surface of the flange with the protuberance means comp.rising radially extending ribs each having a primary rotary driving surface extending upwardly perpendicularly from the upper surEace of the flangc. A secondary surface extends angularly upwardly from the flange upper surface toward the primary driving surface, and the secondary surface provides means by which a mating tool can be cammed gently downward to bring the end of the tool into engagement with the flange and to bring a drive surface of the tool into engagement with each primary driving surface of the fastener member.
The invention further comprehends a tool for driving a fastener having a radially extending flange in-termediate a thread-ed shank and co-axially arranged stud-like projections, by applying rotary torque to protuberance driving means ~n ~he ~lpper surface of the radially extending flange. The tool comprises a cylindrical body with an outer diameter substantially e~ual to the diameter of a flange on an associated double-ended stud.
An axial bore extends from a forward, flange engaging end surface of t.he tool, and the hore is dimensioned so as to be slightly greater in diameter and length of the stud protrusion extending upwardly from the flange on the associated fastener. 'l`he ~"~
~ 5 -~z~
-~xtremity of the body opposite the flange enyaging end surface includes means to transmit torque to the tool, and the flanye en-gaging end surface includes a plurality of abutment surfaces adapt-ed to transmit tc)rqu~ to associated protuberances on the flange of the double-ended stud.
In a still further embodiment, the invention comprehends a fastener member with a low profile, tamperproof head having a first and second s-tud shan~c e~tending axially therefrom, said first stud shank haviny threads with a predetermined thread pitch, and incorporating means to form a mating internal thread in a pre-formed bore with the head comprising a radially extending, annular, thin flange which has a thickness not appreciably greater than said predetermined thread pitch, thereby forming a flat, lower bearing surface and an upper, driving surface. The upper surface includes lS flat surface regions parallel to the lower surface which form a substantial portion of the upper surEace. Three equally spaced generally radially extending protuberances are formed on the upper surface and extend upwardly therefrom, each protuberance including an abutment sur~ace extending perpendiculaxly upwardly from -the upper surface intersecting with a camming surface which provides means to only accept and transmit a rotary force in one direction of rotation. Each protuberance extends upwardly a short distance not generally exceeding the thickness of the ~lange, and the second stud shank cGmprises a centrally located annular cylindrical boss, with smooth walls, extending upwardly from the upper surface and has a diameter substantially less than the diameter of ~he flange, and a height not substantially greater than the thic~ness of the flange, which provides centering and stabilizing means during the driving of the fastener. The flat upper surface region, the smooth surfaced short cylindrical boss and the three equally spaced prot-uberances, in combination~ create means to accurately and predict-ably align a mating ~ri~lng tool wlth the head of the fastener, to insure that sufficisnt torque is applied to the relatively short abutment surface of the protuberances so that the low profile of -the head may be maintained, thus insurincl that th~
fastener member will not acc~pt unauthori~ed removal forces.
Other obj~cts an~ advantacJes of the present invention will become apparent from the follc)winq clescriptlon and the ac company ln q (1 r~, l ncls .
13rier J)cgcri~ ;on of tl-le l)r.lwir _________ __ li'igule 1 is a siclc clevaliol1al vie~v Or the doublc-ell(le(l slucl embodying the featlures Or tlle invclltioll, ]' i~lI`Ci! 2 i ~ pl.lll vic~ O r tl~ , - 2 L0 of l:~`igure l.
Figure 3 is a sidc view, in parl.;al sectioll, of the stu(:l ~nember inserted in a boss S~II racc thr ougll thc u.C;e Or a part;cularly clesignecl tool.
I~igure 4 is an elllargcd side view, in ~-artial section, of all as-sembly using the double-enclcd stud inserl;ccl in a ~vorhl)iec c all(l sllc)willa a nut rncn)ber c~a~ irlg a seconcl<lry work }~].ate o~e~r tllc flange.
liigure 5 i~s an cnd view oi the tool tal;en from its work colltact;ng~
surface end.
Ii`igul e G is all clc~v~tiollal vic-~, in ~)a1~lial scctic~l-, Or tl~c t~-ol (~1`
the inventiotl in association with a fastener of modiricd clesign.
. .", .
3~Z6~i~6~
Ii'ig-lre 7 i9 a Lol) pl~n v.ie~v of tl~e fa.c;tencl of mocliie(l clesign s llo~ Ti'io~ c (`~ .
I~eser.l_~ll of the~ t`e.r.~ ed l!`nlb_linlc?nt.s '.rur~ g first to .l~ig.rs. 1 alncl 2, the d()~lble-elldecl sL~Icl 10 of the present invelltioll will illelucle a rirst, lower stud shank 12 eo-a~;ially arranged with a seeontl, upper stucl shank 30 witll arl integralJ paneake-type flange 18 positiolled interll~ecliatc? the sh;llll;s. ~rhc? first stllcl section 12 is designecl to be assoeiatecl ~Vitll a blinci bore in a wo:rkpieee strueture, sueh as a p].ast.ie boss. With this in mind, it .i~s preferably provided with a threacl eonvolutiotl 1~ Or rather sllarp erested, spaeed threads. A thread elltting slot 16 i9 formed irl the extrelnity o Lhe ~serew to faeilitate the anellorirlg~ embedmerlt Or this Iirst shallk ~vithin the bore of tlle primarSr ~vo~ st:rueturc?. It sllo-lld be llotecl, 1lO\~rL~C?1~, Lll.lt C?~'C?II
. though a thread euttln~ slot is shown in the preIerre(l elnboclimerlt, a number o alternate eonfigurations ean be used to properl~y form or generate an internal threacl in the pr.irrlary~work st:rueture.
~ radially extencling flange 1~3 is eonigured to provide a: generally flat undersurfaee 22, aclJaeent the .first stud SC'C~tlC~ll 12j. and an upper suraee 20 adjaeent the seeoncl stud seetion 30. 'rhe upper su.rfaee 20 : ~ ineludes a pluarlity o generally radially extendingS protuberan~es ~formed on an other~vise flat uppc.?r surraee. 'rhese protubeIanees fornl an ilil~
portant ~speet of the inventloll an(3 their dual purpose will be cleseribecl in detail further herein.
'rhe preferrl?c3 e~llboclirr~ent (~f tlle Inventioll sho~vs thl`e(` I`i~ iC
members extending generally radially of the a:Yis of the fastener. 'rlle O~L
rlenlb(~I~ Z~ i1l ( o~ ;e ~ t~ O ~Irf;lc t ~(;, extending sul)sIc~ ially perl)en(licu'Lar lo tlle t'ellla;ll;llg ~urîace regi(~
of the uppel Elange surl'aec? 20. The su~races ~ l'11 also e~;tt n-I radial-ly oE t'tlt~ cis Or llltl rcl~tt~ller to ,I~ ve I~ ;ilt~ t~f~ y Or tllt.~
rotary t'orc~e applie~l lo the Fastenc~r. l\ secollclary .sutface 2d, in lhe form of a ram~, extentls upwardly at an acutt? angle to tlle upper ~Iange surEace and to\varcl llle p1ane of tht~ prilllary d~ c~ ~c~ulrrace 2(`., 'I'lle eamming surfact? 28 pe~rmits an associated driver, such as 46, to be plaeed in operative position witb a gradua] and "soft" engagement onto the flange surfaee 20, rrhe preferred embodin~etlt disclose~s tlle cam- -ming surface as directly interseeting the abutmeIlt surEace 26; ho\vever, it should be understootl that intermediate sulraces cou'ld be provided of any variety Or conEiglIratiolls aIlcl still eollle \~ itllin tlle hl oad s~ope c.r this invention.
A reference to Figs. 3 and 5 will show a tool for drivmg l!le above-described fastener and the typica'l applicatioIl for such a fastener~.
A typieal use for double-ended fasteIler6 of the t~yI~e described is Lo ~; aehieve a meaIls to clamp a second~r~i wo1k strllcture or plale-like tk?~
viee to a molded plaslie strueture. Common aF)plieations Eor doub1e-.
2 0 ended studs include fastener receiving hosses, such as 3~L, formed in an otherwise thitl plastie structure. 'Ihe bos,ses illClUClt~ a bore 38, oE
a predetermined diameter. In use, the stud member 10 is assoeiated with a driving tool 46 with the seeond stud section 30 reeeived in a bore 54 in tlle body 4~ of the tool. 'I'lle fasteIlel 111Cn~ C]' In l~ r llC' r(`l~'lill(~
in the tool prior to driving, througll the use o~ magnets or the like (not : :
shown). Torque transmittiIlg sur~aces, sueh as a ~soclceL 5~, may l)t`
.
9, _ ~!~
~26~63~
fornled in lhC~ e,~ C~ .5 Or ~h(' tool O~)l)OSilC` lllt` ~OII; Cn~<l~ g c~;tremil to transmit lorq~le fl c~nl a po~ver tool to lhe slutl dr iving alt.ac~ cnt ~fi.
It sho-lld l~e noted l;hat t.l~t` di.lllletr.~ o~ lh(` l~ocl~ ~t~, .is s~ si.lnliall~ th.lt of the flclnge 18 Rn~] ~IppCI~ SIII race 3G of the l~o~ss, 'l`l-lis di~nensic)nal 5 re1at;onship is pcImitltecl by the nove1 conri~uratlon Or thc tool hereir clescribed ancl bc~co~lles inlportanl in secl~ring r;l~C;lc~llel~: in collrillo(l regions or in an area ~vht!re the cenlc~r 1ine lo ccnlcr 1ine cli~stance be-tween adjacent like fasteners is slnall.
As best shown in T~`ig. 5. worli engagil-lg end surface 50 of the tool 46 is provicled ~vith rl pluralit~T oE grooves 51 equa1 in nu1nber to the number of ribs 2~.T. on lhe fastener. '~ e;:e grooves ~vi11 easi1y nest ~vitl the associaled ribs ciue in l)art to the cooperation ol` tlle callllllin~ ralllp surface 2~ Or each rib tvitli tlle grooves.
:
While the config~lration of tbe grooves 51 may take several forms, lS all of the~n preferab1y wi11 include a genera11~ perpendicll1arly arrange(l primary abutment surface 52 adapted for opercll:ivo association willl the perpenclicularly arl~ange(l primary driving SUI facc 2G c~ tl~ lel-.
'rhe height of the primary abutnlent surface 52 sllollld prc~rerably be at least as much as the height of mating surrace 2G so that the end surface ~: 20 50 engages top surface 20 c~r tlle f]ange. 'I'he eng.lgemenl ol` tlle r e~main-;~ der of the surfacc 50 with the top ~lange surface 20 provideR an a1ign-ment and stabiliæation to the fastenor as it is being driven. ],I'urtller attention is directcd k- Illc ali~nt ant3 6ta~ iæ;ilion pl`o~idCCl b~ thc telegcopic a.ssociation Or lllC upl)Cr Stlld Sllatlk 3() witll the boIc 5~ vllic~l is dimensioncd so lhat botll thc lenglh Or thc stud allcl Illt' dian~elr are recei~i~ed therein without abut-ment.
.
11;Z601~L
~ l( rcrf~ (`c` to 1~ j~r, ~-1 will .s~lO~v c~ '( ol~ r)or~ nl l'~ ,1ion c~f thc,~ ribs 2~ on tlle fastcllc~l. ()nce t11e sl:u(,l 10 i.~: prc)perl~ sea~e(1 On the u})per surface 36 o.t' t11e boss 3~1, the secotldclry plale 40 is po.~,itiol1ed, preferably throug1l t.he use of a cle.lrcltlce hole, over the stud section 30. '.rhe pl;:lte ~t0 is tlletl C`klll~l)eCl ngainSI: 11Ie ~I~!tl(`l:` ~nt fa( e "~) 0 flange .in a mallnex s1~ n in .IfiC~ . '.l`his clamping~ is acllievecl throug the use of a nut me~.ml)e:r 44. 'rhe nut mernl)er ~ vill lyp.ieally h.lve tl~e same hand of rotation fo:r it~s internal threclds as tllat of the thread con-fxguration'~ 4 on the first stud shank wllieh is driven into thce boss 34.
It should be noted that while tlle pre:ferred embod.irnent sllowsa rnaehine threacl 32 on the seconc1 ~stu(1 sectiotl 3n, thnt it'is c~ollcei~lble 111.lt t11e .' stud seetion 30 may be void o.~ 1:hreads ancl that llle nut 1llc,~ml)er 4~ nlay :: be of a thread forInirlg tyye. In any event, the problems solved by the invention are the same, that being the seeurenlent o-f the stud 10 from .
15 retrograde Inovement as the nut 44 is subjectec3 to a. torque to break the elamping, engagen)ent between the nut a1~ nember ~0. It .s}lot]l(3 be, noted that UpOIl tigl1t c1alllping of the nut ~ l: ag;li1lsi the p'1.1t.(' 1U,, I.l~c sharp ape~{ of tlle rib 24 embeds in the unders-ur.raee o'f the plclte in regions 42, Due to the'perpendicular arrangernent of ~the ~sur~aee 26, 20 torque forces applied to the stud c1urirlg efforts to remove the nilt, axe resisted due to the locking, embecl1xlent ol the IIb~ 2~ ~rlth t.he plate 40.
. ~ .
While the tool Or the in~enl.;otl has been de~seril)(?(1 in collt1ect.ioll .
with a doul~le-ended stu(3, reference~to ~igs. 6 a.n(l 7 will point out the ' advantages of such a tool with a fastener of modi.f.ied design. Sever~l 25 important features Or the c]ouble-eildec] stucl eould be ineorpc.)rated in a fastener having a notl-renloveable tanl~erproor llead. .li`or e~ampie, - ' r~ ~ ~ 11 ~
. . . . .
:
112~6~L
fastener 10a is configurc(l to havc a low profilc hc acl inclucling a pancal;c-type fLat flange 13a ancl all ax;ally e~;lellcling thrcaded shanl~ ~a. rl'lle upper surface of the flange will be collEigured with rclclially extcndill~
ribs 24a comprisillg a perpendiculclr dl'`iVill$ surrac~ 2(ia allcl t`altlp ~;ur-5 ' face 28a perlllittitlg dl`.iVillg ill Ollly OtlC,' direction. ~ CylillCIriC-ll St-ll) shanlc 30a is axially c~isposed on the fLancsc \vith side walls 32cL extending a height not substarltially e~;ceecling the height of clriving surface 26a.
~s in the double-ended stud enlboclinlent, the flat surface region 20a is a substantial portion of the total upper surface area of flange 18a.
The dri~ing tool 4Gcl can be asso(~iated ~ith tlle talllpei pl~ooE
fastener 10a in a manner identica'L to lllat desccribe(l above re'lal;ive to double-ended fastener 10. 'I'he tool 46a is described witll like refer~
ence nunLerals identifying like eleme~nts to 46 with the,acldit;on of the , suffix "a". It should be particularly noted that bore 54a is of such a diameter as to receive stub shank 30a and supporl the side walls 32a therein to center anc~ stahili~.e'the fasteller 10a clurillg dL iVill~ 'lle .
~ ~ stub shanls 30a will be a height great enough to accomplisll this coopera-.
tion with the tool 46a but not so great as to permit the fastener to be ~
removed through the grasping of the shallk with a tool. ~rrhe cooperative , ~
interrelation betwec~lL flat surfaces 50a of the too'l and thr-` fl'at upper :: : :
surfaces 20a of the fastener and the inner periyhery of bore' 54a of the tool and short side wc-Llls 32a Or thc,~ boss Or tllc~fastel-ler c~cllef~ anc3 critically stabilizes and centers the tool Oll the fastener and prevents the tool from cocking out of the a~i~s Or lhe faslcller.
~ 1 2 , .. .
~Z6~
] Thus, l!~cre ;s sl~o~vn a1lcl de.scl~ibe(l 1 d0~ etltJe(l Sl,lld ~vhicll includes novcl clri~1in~,~ sllrfaces wllich alst> runctiotl as 1 nleans to locl;
the fastener from re]lloval as tlle nut n~cmbcr is k~oscn((l thcterrc)m.
driving of a f~lC teller inlo a worlc sUI rat~
While parlic~lllr elllbotlilllerlts oL tht~ pre~ent invetll;on have bt-~en sho~vn and describe(l/ it ~,vill be obvious to tho.se skil1ed ;n the art that changes and mod;ficat;ons maybe made w;thout departing from Lhis in-vention in its broader aspects and~ thelefore, the lilll in the appencled claims is to cover all such challges and nlodifications as iall within the true spirit and broacl scope of the invenlit n.
:
~; ~
i . :
.
:
'~ ' .
.
a predetermined diameter. In use, the stud member 10 is assoeiated with a driving tool 46 with the seeond stud section 30 reeeived in a bore 54 in tlle body 4~ of the tool. 'I'lle fasteIlel 111Cn~ C]' In l~ r llC' r(`l~'lill(~
in the tool prior to driving, througll the use o~ magnets or the like (not : :
shown). Torque transmittiIlg sur~aces, sueh as a ~soclceL 5~, may l)t`
.
9, _ ~!~
~26~63~
fornled in lhC~ e,~ C~ .5 Or ~h(' tool O~)l)OSilC` lllt` ~OII; Cn~<l~ g c~;tremil to transmit lorq~le fl c~nl a po~ver tool to lhe slutl dr iving alt.ac~ cnt ~fi.
It sho-lld l~e noted l;hat t.l~t` di.lllletr.~ o~ lh(` l~ocl~ ~t~, .is s~ si.lnliall~ th.lt of the flclnge 18 Rn~] ~IppCI~ SIII race 3G of the l~o~ss, 'l`l-lis di~nensic)nal 5 re1at;onship is pcImitltecl by the nove1 conri~uratlon Or thc tool hereir clescribed ancl bc~co~lles inlportanl in secl~ring r;l~C;lc~llel~: in collrillo(l regions or in an area ~vht!re the cenlc~r 1ine lo ccnlcr 1ine cli~stance be-tween adjacent like fasteners is slnall.
As best shown in T~`ig. 5. worli engagil-lg end surface 50 of the tool 46 is provicled ~vith rl pluralit~T oE grooves 51 equa1 in nu1nber to the number of ribs 2~.T. on lhe fastener. '~ e;:e grooves ~vi11 easi1y nest ~vitl the associaled ribs ciue in l)art to the cooperation ol` tlle callllllin~ ralllp surface 2~ Or each rib tvitli tlle grooves.
:
While the config~lration of tbe grooves 51 may take several forms, lS all of the~n preferab1y wi11 include a genera11~ perpendicll1arly arrange(l primary abutment surface 52 adapted for opercll:ivo association willl the perpenclicularly arl~ange(l primary driving SUI facc 2G c~ tl~ lel-.
'rhe height of the primary abutnlent surface 52 sllollld prc~rerably be at least as much as the height of mating surrace 2G so that the end surface ~: 20 50 engages top surface 20 c~r tlle f]ange. 'I'he eng.lgemenl ol` tlle r e~main-;~ der of the surfacc 50 with the top ~lange surface 20 provideR an a1ign-ment and stabiliæation to the fastenor as it is being driven. ],I'urtller attention is directcd k- Illc ali~nt ant3 6ta~ iæ;ilion pl`o~idCCl b~ thc telegcopic a.ssociation Or lllC upl)Cr Stlld Sllatlk 3() witll the boIc 5~ vllic~l is dimensioncd so lhat botll thc lenglh Or thc stud allcl Illt' dian~elr are recei~i~ed therein without abut-ment.
.
11;Z601~L
~ l( rcrf~ (`c` to 1~ j~r, ~-1 will .s~lO~v c~ '( ol~ r)or~ nl l'~ ,1ion c~f thc,~ ribs 2~ on tlle fastcllc~l. ()nce t11e sl:u(,l 10 i.~: prc)perl~ sea~e(1 On the u})per surface 36 o.t' t11e boss 3~1, the secotldclry plale 40 is po.~,itiol1ed, preferably throug1l t.he use of a cle.lrcltlce hole, over the stud section 30. '.rhe pl;:lte ~t0 is tlletl C`klll~l)eCl ngainSI: 11Ie ~I~!tl(`l:` ~nt fa( e "~) 0 flange .in a mallnex s1~ n in .IfiC~ . '.l`his clamping~ is acllievecl throug the use of a nut me~.ml)e:r 44. 'rhe nut mernl)er ~ vill lyp.ieally h.lve tl~e same hand of rotation fo:r it~s internal threclds as tllat of the thread con-fxguration'~ 4 on the first stud shank wllieh is driven into thce boss 34.
It should be noted that while tlle pre:ferred embod.irnent sllowsa rnaehine threacl 32 on the seconc1 ~stu(1 sectiotl 3n, thnt it'is c~ollcei~lble 111.lt t11e .' stud seetion 30 may be void o.~ 1:hreads ancl that llle nut 1llc,~ml)er 4~ nlay :: be of a thread forInirlg tyye. In any event, the problems solved by the invention are the same, that being the seeurenlent o-f the stud 10 from .
15 retrograde Inovement as the nut 44 is subjectec3 to a. torque to break the elamping, engagen)ent between the nut a1~ nember ~0. It .s}lot]l(3 be, noted that UpOIl tigl1t c1alllping of the nut ~ l: ag;li1lsi the p'1.1t.(' 1U,, I.l~c sharp ape~{ of tlle rib 24 embeds in the unders-ur.raee o'f the plclte in regions 42, Due to the'perpendicular arrangernent of ~the ~sur~aee 26, 20 torque forces applied to the stud c1urirlg efforts to remove the nilt, axe resisted due to the locking, embecl1xlent ol the IIb~ 2~ ~rlth t.he plate 40.
. ~ .
While the tool Or the in~enl.;otl has been de~seril)(?(1 in collt1ect.ioll .
with a doul~le-ended stu(3, reference~to ~igs. 6 a.n(l 7 will point out the ' advantages of such a tool with a fastener of modi.f.ied design. Sever~l 25 important features Or the c]ouble-eildec] stucl eould be ineorpc.)rated in a fastener having a notl-renloveable tanl~erproor llead. .li`or e~ampie, - ' r~ ~ ~ 11 ~
. . . . .
:
112~6~L
fastener 10a is configurc(l to havc a low profilc hc acl inclucling a pancal;c-type fLat flange 13a ancl all ax;ally e~;lellcling thrcaded shanl~ ~a. rl'lle upper surface of the flange will be collEigured with rclclially extcndill~
ribs 24a comprisillg a perpendiculclr dl'`iVill$ surrac~ 2(ia allcl t`altlp ~;ur-5 ' face 28a perlllittitlg dl`.iVillg ill Ollly OtlC,' direction. ~ CylillCIriC-ll St-ll) shanlc 30a is axially c~isposed on the fLancsc \vith side walls 32cL extending a height not substarltially e~;ceecling the height of clriving surface 26a.
~s in the double-ended stud enlboclinlent, the flat surface region 20a is a substantial portion of the total upper surface area of flange 18a.
The dri~ing tool 4Gcl can be asso(~iated ~ith tlle talllpei pl~ooE
fastener 10a in a manner identica'L to lllat desccribe(l above re'lal;ive to double-ended fastener 10. 'I'he tool 46a is described witll like refer~
ence nunLerals identifying like eleme~nts to 46 with the,acldit;on of the , suffix "a". It should be particularly noted that bore 54a is of such a diameter as to receive stub shank 30a and supporl the side walls 32a therein to center anc~ stahili~.e'the fasteller 10a clurillg dL iVill~ 'lle .
~ ~ stub shanls 30a will be a height great enough to accomplisll this coopera-.
tion with the tool 46a but not so great as to permit the fastener to be ~
removed through the grasping of the shallk with a tool. ~rrhe cooperative , ~
interrelation betwec~lL flat surfaces 50a of the too'l and thr-` fl'at upper :: : :
surfaces 20a of the fastener and the inner periyhery of bore' 54a of the tool and short side wc-Llls 32a Or thc,~ boss Or tllc~fastel-ler c~cllef~ anc3 critically stabilizes and centers the tool Oll the fastener and prevents the tool from cocking out of the a~i~s Or lhe faslcller.
~ 1 2 , .. .
~Z6~
] Thus, l!~cre ;s sl~o~vn a1lcl de.scl~ibe(l 1 d0~ etltJe(l Sl,lld ~vhicll includes novcl clri~1in~,~ sllrfaces wllich alst> runctiotl as 1 nleans to locl;
the fastener from re]lloval as tlle nut n~cmbcr is k~oscn((l thcterrc)m.
driving of a f~lC teller inlo a worlc sUI rat~
While parlic~lllr elllbotlilllerlts oL tht~ pre~ent invetll;on have bt-~en sho~vn and describe(l/ it ~,vill be obvious to tho.se skil1ed ;n the art that changes and mod;ficat;ons maybe made w;thout departing from Lhis in-vention in its broader aspects and~ thelefore, the lilll in the appencled claims is to cover all such challges and nlodifications as iall within the true spirit and broacl scope of the invenlit n.
:
~; ~
i . :
.
:
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.
Claims (12)
1. A fastener member including a first stud shank and a second stud shank co-axially arranged with an integral radially extending thin flange, intermediate thereof, the first stud shank including a helical thread formed thereon incorporating means to form a mating internal thread in a preformed bore in an associated work surface, the flange defining a lower surface adjacent the first shank and an upper surface, adjacent the second stud shank, upstanding protuberance means formed on said upper surface of the flange, the protuberance means comprising radially extending ribs each having a primary rotary driving surface extending upwardly perpendicularly from the upper surface of the flange, a secondary surface extending angularly upwardly from the flange upper surface toward the primary driving surface, said secondary surface providing means by which a mating tool can be cammed gently downward to bring the end of the tool into engagement with the flange and to bring a drive surface of the tool into engagement with each primary driving surface of the fastener member.
2. The fastener member of Claim 1, wherein said first shank and said second shank are co-axially arranged with the flange.
3. The fastener member of Claim 2, in combination with a nut member associated with the second stud shank, the thread configuration of the nut member being of the same hand as the thread on the first stud shank, wherein the protuberance means embedded in the under-surface of the secondary workpiece resists rotation of the fastener member about its axis when torque is applied to the nut member in the direction of removal.
4. The fastener member of Claim 2, wherein the second stud shank includes a helical thread formed thereon of the same hand as the thread formed on the first stud shank.
5. The fastener member of Claim 2, wherein the second stud shank is a centrally located annular cylindrical boss extending upwardly from the upper surface and having a diameter substantially less than the diameter of the flange and a height not substantially greater than the thickness of the flange providing centering and stabilizing means during the driving of the fastener.
6. The fastener member of Claim 1, wherein the secondary surface is a ramp extending upwardly at an acute angle to the upper flange surface.
7. A fastener member with a low profile, tamperproof head having a first and a second stud shank extending axially therefrom, said first stud shank having threads with a predetermined thread pitch and incorporating means to form a mating internal thread in a preformed bore, said head comprising a radially extending, annular thin flange having a thickness not appreciably greater than said predetermined thread pitch thereby forming a flat, lower bearing surface and an upper, driving surface, the upper surface including flat surface regions parallel to said; lower surface and forming a substantial portion of; said upper surface, three equally spaced generally radially extending protuberances formed on said upper surface extending upwardly therefrom, each protuberance including an abutment surface extending perpendicularly upwardly from the upper surface intersecting with a camming surface providing means to only accept and transmit a rotary force in one direction of rotation, each protuberance extending upwardly a short distance not generally exceeding the thickness of the flange, said second stud shank comprising a centrally located annular cylindrical boss, with smooth walls, extending upwardly from the upper surface having diameter substantially less than the diameter of the flange and a height not substantially greater than the thickness of the flange providing centering and stabilizing means during the driving of the fastener, the flat upper surface region, smooth surfaced short cylindrical boss and three equally spaced protuberances in combination creating means to accurately and predictably align a mating driving tool with the head of the fastener to insure that sufficient torque be applied to the relatively short abutment surface of the protuberances so that the low profile of the head may be maintained insuring that the fastener member will not accept unauthorized removal forces.
8. The fastener member of Claim 7 wherein the cylindrical boss has a diameter substantially equal to the diameter of the threaded shank.
9. The fastener member of Claim 7, wherein the pro-tuberances extend from the boss to the outer periphery of the flange with the abutment surface on each protuberance being of uniform height along its radial extent.
10. The fastener member of Claim 7, wherein the abutment surfaces lie on longitudinal planes intersecting the longitudinal axis of the fastener.
11. The fastener member of Claim 7, wherein a plurality of the protuberances are configured so that the camming surface leads the abutment surface in the direction of rotation of the fastener which causes it to be fed into an associated workpiece.
12. The fastener member of Claim 11, wherein at least one of the protuberances is configured so that the camming surface leads the abutment surface in the direction of rotation of the fastener which causes it to be retracted from an associated workpiece.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80505677A | 1977-06-09 | 1977-06-09 | |
| US805,057 | 1977-06-09 | ||
| US05/805,057 US4125051A (en) | 1977-06-09 | 1977-06-09 | Tamperproof fastener |
| US805,056 | 1977-06-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1126061A true CA1126061A (en) | 1982-06-22 |
Family
ID=27122749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA303,265A Expired CA1126061A (en) | 1977-06-09 | 1978-05-12 | Fastener and drive system |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1126061A (en) |
| DE (1) | DE2825483A1 (en) |
| FR (1) | FR2393971B1 (en) |
| GB (1) | GB2000241B (en) |
| IT (1) | IT1095156B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416063A (en) * | 1977-06-09 | 1979-02-06 | Illinois Tool Works | Insertable bolt and driving attach ment therefore |
| US4439077A (en) * | 1982-02-11 | 1984-03-27 | Godsted Kent B | Concrete screw anchor |
| DE3312782C2 (en) * | 1983-04-09 | 1986-07-17 | Ford-Werke AG, 5000 Köln | Screw for fastening and sealing on through-tapped holes |
| US4915534A (en) * | 1987-05-06 | 1990-04-10 | Progressive Fastening, Inc. | Screw joint connection between metal members |
| DE19854050A1 (en) * | 1998-11-24 | 2000-05-25 | Hella Behr Fahrzeugsysteme | Flange connection between front ends of longitudinal support of motor vehicle and deformable bumper elements uses threaded bolts with thread sections at both ends for screwing and unscrewing from either end |
| DE102004002559A1 (en) * | 2004-01-17 | 2005-08-11 | Bayerische Motoren Werke Ag | Method for permanently joining of threaded bolt with bore at relatively soft component, comprising particular relations between dimensions |
| DE102010045163B4 (en) * | 2010-09-11 | 2023-07-20 | Volkswagen Ag | Connection means with a first connection side for a detachable connection and a second connection side for attachment to a component |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR466526A (en) * | 1912-12-26 | 1914-05-15 | Gustave Yseboodt | Improvements to lag screws, nut bolts, etc. |
| GB614921A (en) * | 1945-01-05 | 1948-12-30 | Charles Aloysius Simmons Sr | Improvements in fastening devices |
| US2813450A (en) * | 1954-05-03 | 1957-11-19 | Dzus William | Rotatable fastener having circular toothed tool receiving groove |
| BE539985A (en) * | 1954-08-09 | |||
| US3241589A (en) * | 1964-09-14 | 1966-03-22 | Max L Enders | Positive self-locking fastening means |
| GB1114099A (en) * | 1967-01-16 | 1968-05-15 | Marvin Walton | One-way screw for operation with high speed power tools |
| GB1146315A (en) * | 1966-05-13 | 1969-03-26 | Broads Mfg Company Ltd | Improvements relating to access cover assemblies |
| US3354757A (en) * | 1966-06-13 | 1967-11-28 | Elastic Stop Nut Corp | Spline wrenching configurations |
| GB1463496A (en) * | 1973-04-25 | 1977-02-02 | Chart D | Screw-threaded fasteners |
-
1978
- 1978-05-12 CA CA303,265A patent/CA1126061A/en not_active Expired
- 1978-06-07 DE DE19782825483 patent/DE2825483A1/en not_active Ceased
- 1978-06-08 GB GB7826532A patent/GB2000241B/en not_active Expired
- 1978-06-08 FR FR7817149A patent/FR2393971B1/en not_active Expired
- 1978-06-09 IT IT24410/78A patent/IT1095156B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1095156B (en) | 1985-08-10 |
| IT7824410A0 (en) | 1978-06-09 |
| GB2000241B (en) | 1982-01-27 |
| DE2825483A1 (en) | 1978-12-21 |
| FR2393971A1 (en) | 1979-01-05 |
| GB2000241A (en) | 1979-01-04 |
| FR2393971B1 (en) | 1985-12-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |