US20050207862A1 - Self-polishing and tapping rivet assembly - Google Patents
Self-polishing and tapping rivet assembly Download PDFInfo
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- US20050207862A1 US20050207862A1 US10/939,987 US93998704A US2005207862A1 US 20050207862 A1 US20050207862 A1 US 20050207862A1 US 93998704 A US93998704 A US 93998704A US 2005207862 A1 US2005207862 A1 US 2005207862A1
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- rivet
- auger
- rivet assembly
- polishing
- self
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 70
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- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
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Images
Classifications
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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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
- F16B19/1027—Multi-part rivets
- F16B19/1036—Blind rivets
- F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
- F16B19/1054—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like being frangible
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/02—Riveting procedures
- B21J15/04—Riveting hollow rivets mechanically
- B21J15/048—Setting self-drilling hollow rivets
-
- 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/008—Bolts without screw-thread; Pins, including deformable elements; Rivets with sealing 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/083—Self-drilling rivets
-
- 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/086—Self-piercing rivets
-
- 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
- F16B19/1027—Multi-part rivets
- F16B19/1036—Blind rivets
- F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
- F16B19/1072—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like comprising a thread and being rotated with respect to the rivet, thereby mechanically expanding and fastening the rivet
-
- 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
- F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
- F16B37/06—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting
- F16B37/062—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting
- F16B37/065—Devices for fastening nuts to surfaces, e.g. sheets, plates by means of welding or riveting by means of riveting by deforming the material of the nut
-
- 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
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
- F16B2019/1009—Hollow rivets; Multi-part rivets fastened by expanding mechanically hollow or single-part rivets fastened by a pull-through mandrel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
- Y10T408/906—Axially spaced
Definitions
- the present invention generally relates to the field of fasteners such as rivets and the like, and more particularly to a self-polishing and tapping rivet assembly.
- Typical drills have spirals designed to help the metal edges cut and spiral the shrapnel out.
- the spirals are designed to help the cut metal edges to create shrapnel which requires that high torque be placed on the mandrel of the rivet assembly.
- U.S. Pat. No. 5,915,901 describes the use of the excurvations formed during application to increase application strength.
- a polished aperture is desirable. Consequently, it would be advantageous to provide a blind setting rivet that would be both self-tapping and self-polishing instead of only self drilling (using a drill bit) or only self-tapping (using a screw tip).
- Such a self-tapping, self-polishing rivet would remove all excurvations that would leave a clean aperture.
- a self-tapping and self-polishing rivet would be less expensive and easier to manufacture than the self-drilling rivets (using a drill bit) and would require less torque during application.
- the present invention is directed to a self-tapping and self-polishing blind setting rivet assembly capable of permanently fastening one or more work pieces or the like together and/or to another object.
- the rivet assembly may further include a hollow cylindrical threaded bolt head onto which a nut may be affixed to provide a means to removably attach other work pieces, components or the like.
- FIG. 3 is a side elevational view illustrating the mandrel of the rivet assembly shown in FIG. 1 ;
- FIG. 4 is a side elevational enlarged view illustrating the self-tapping and self-polishing head of the mandrel shown in FIG. 3 ;
- FIGS. 5A and 5B are a front elevational views further illustrating exemplary self-tapping and self-polishing augers in accordance with the present invention
- FIGS. 6A, 6B and 6 C are side elevational view illustrating alternative self-tapping and self-polishing augers in accordance with exemplary embodiments of the invention.
- FIG. 9 is a partial cross-sectional side elevational view of the rivet assembly shown in FIG. 1 depicting the rivet assembly after the application of a rearward force on the mandrel shank;
- FIG. 11 is a partial cross-sectional side elevational view of an alternative embodiment of the present invention depicting the detachment of the auger and shoulder section following application;
- FIG. 12 is a partial cross-sectional, side elevational view illustrating a self-tapping and self-polishing blind setting rivet assembly in accordance with a second exemplary embodiment of the present invention
- FIG. 14 is a partial cross-sectional side elevational view illustrating a self-tapping and self-polishing blind setting bolt rivet assembly in accordance with an exemplary embodiment of the present invention, wherein the bolt rivet assembly is shown following application of rearward force on the mandrel shank causing separation of the upper shank and the screw tip;
- FIG. 15 is a partial cross-sectional side elevational view illustrating a self-tapping and self-polishing blind setting bolt rivet assembly depicting with a threaded enlarged flattened head in accordance with an exemplary embodiment of the present invention, wherein the bolt rivet assembly is shown following completion of self-tapping and self-polishing of an aperture prior to application;
- rivet assembly 100 comprises a rivet body 102 having a hollow tubular rivet sleeve 104 and an enlarged flattened head 106 surrounding a mandrel 108 having a self-tapping and self-polishing auger 110 , a shoulder section 112 , and a shank 114 .
- the rivet body 102 may be made of steel, aluminum, plastic, composite, or other desirable rivet material.
- the mandrel 108 may be made of steel, aluminum, plastic, composite, or other material, which is preferably of higher tensile strength than the rivet body material.
- Self-tapping and self-polishing auger 110 is comprised of a generally conical barrel having a self-tapping and self-polishing tip 116 , a cutting portion 118 , and optionally a polishing portion 120 .
- a weakened area of reduced diameter 122 may be formed in the mandrel shank 114 rearward from shoulder section 112 . This weakened area 122 is preferably sized to fracture upon application of a predetermined tensile force to the shank 114 allowing self-tapping and polishing auger 110 and shoulder section 112 to be detached from shank 114 following completed application of the rivet assembly 100 .
- an area of enlarged diameter 124 may be formed in mandrel 108 between shoulder section 112 and weakened area of reduced diameter 122 .
- This area of enlarged diameter 124 retains mandrel 108 within rivet body 102 until sufficient force is applied to the shank 114 during application to set the rivet body 102 and cause the area of reduced diameter 122 to fracture.
- this enlarged area 124 also retains the self-tapping and polishing auger 110 and shoulder section 112 within sleeve 104 following application of the rivet assembly 100 by creating an interference with the inner surface of the sleeve 104 as the sleeve 104 is deformed during application of the rivet.
- weakened area 122 may be positioned on mandrel 108 so that a length of shank 114 remains in rivet body 102 after separation of the rear portion of the shank 114 .
- this length is predetermined to allow shank 114 to fracture at a point that is substantially flush with the outer surface of enlarged flattened head 106 . In this manner, the remaining part of shank 114 substantially fills the hollow portion of the rivet body 102 , increasing its strength.
- the areas of reduced diameter 122 and enlarged diameter 124 may have different cross-sectional shapes depending upon factors such as, for example, the material from which the mandrel 108 is made, the types of work piece material(s) in which the rivet assembly 100 is being applied, the amount of fracture strength required for the area of reduced diameter 122 , and the holding strength of the area of enlarged diameter 124 .
- the area of reduced diameter 122 and enlarged diameter 124 are shown as having generally curved cross-sectional shapes. However, in other embodiments, these areas may have a V-shape, a rectangular shape, a faceted shape, or the like.
- self-tapping and polishing auger 110 is held substantially normal to the surface of a work piece while rotary motion is applied to shank 114 .
- This rotary motion threads the auger 110 into the work piece materials and expands them.
- the auger 110 pulls itself through the work piece materials while simultaneously smoothing the aperture it forms.
- self-tapping and self-polishing tip 116 is pointed or angled to facilitate piercing of the outer surface of the work piece.
- the rear portion of the shank 114 may be designed for use with a specialized chuck or various types of power or hand tools to provide rotary motion and axial retraction to the mandrel 108 .
- the outer diameter 130 of shoulder section 112 is slightly larger than outer diameter 132 of rivet sleeve 104 allowing the sleeve to pass through the hole or aperture formed by self-tapping and self-polishing rivet head 110 .
- self-tapping and self-polishing auger 110 of mandrel 108 is described.
- self-tapping and self-polishing auger 110 is comprised of a generally conical barrel having a self-tapping tip 116 , a cutting portion 118 , and optionally a polishing portion 120 .
- self-tapping tip 116 includes a point 134 for piercing the surface of a work piece.
- Point 134 which may be centered on the longitudinal axis of auger 110 or offset therefrom, extends into one or initial contact edges 136 suitable for forming a hole or aperture by puncturing, separating and then scraping or carving work piece material.
- Initial contact edges 136 may be angled and may be offset to assist in separating and tapping the work piece material(s).
- self-tapping and self-polishing tip 116 facilitates initial insertion (tapping) of the rivet assembly 100 allowing the rivet assembly 100 to be more easily started in the work piece.
- Staged leading cutting edges 140 and trailing edges 142 may be formed in the cutting portion 118 of self-tapping and self-polishing auger 110 along groove 138 , rearward of self-tapping tip 116 .
- leading cutting edges 140 incrementally remove work piece material(s) by shaving or carving the materials from the wall of the aperture being formed. The removed materials may then be channeled away from the aperture by groove 138 . In this manner, the amount of torque required for inserting or tapping rivet assembly 100 through a work piece is substantially reduced compared to conventional self-boring rivet assemblies.
- leading cutting edges 140 and trailing edges 142 may be substantially parallel to the longitudinal axis 144 of self-tapping and self-polishing auger 110 .
- any or all of leading cutting edges 140 and trailing edges 142 may be angled, thereby forming an angle ( ⁇ ) with respect to longitudinal axis 144 .
- leading cutting edges 140 and trailing edges 142 are generally parallel to longitudinal axis 144 , angle ( ⁇ ) is substantially zero (0).
- leading cutting edges 140 and/or trailing edges 142 may be curved.
- a polishing leading edge 148 may be formed in the polishing portion 120 of self-tapping and self-polishing auger 110 along groove 138 rearward of cutting portion 118 and forward of shoulder portion 112 .
- a polishing trailing edge 150 may be formed in the polishing portion 120 along groove 138 opposite leading edge 148 .
- polishing leading and trailing edges 148 & 150 remove any excurvations (e.g., material bored away from work piece by auger 110 ) leaving a clean, substantially burr free aperture formed in the work piece(s) through which rivet sleeve 104 ( FIGS. 1 and 2 ) may pass.
- either or both of polishing leading edge 148 and/or polishing trailing edge 150 may be curved.
- polishing leading edge 148 and polishing trailing edge 150 may be substantially parallel to the longitudinal axis 144 of auger 110 .
- either one or both of polishing leading edge 148 and polishing trailing edge 150 may be angled, thereby forming an angle ( ⁇ ) with respect to longitudinal axis 144 .
- the amount of material removed during each turn of auger 110 may be controlled. Generally, by selecting a larger value of angle ( ⁇ a for an auger having a given length (l), a smaller amount of work piece material is removed by each leading cutting edge 140 . Likewise, by selecting a larger value of angle ( ⁇ ) for an auger 110 having a given length (l), a smaller amount work piece material is removed during each turn.
- angles ( ⁇ ) and ( ⁇ ) will depend on factors such as the application in which rivet assembly 100 is to be used and the material properties of the work pieces in which rivet assembly 100 is to be inserted, the amount of material to be removed by cutting and polishing edges 140 & 148 , and the like.
- angle ( ⁇ ) is substantially zero (0).
- polishing edges 148 & 150 are formed with an angle ( ⁇ ) equal to the taper of the cutting portion 118 of self-tapping and self-polishing auger 110 . According, the polishing edges 148 & 150 shown in FIG. 4 would remove more material from the work piece(s) during each turn of auger 110 than the polishing edges shown in FIG. 6A .
- self-tapping and self-polishing auger 110 may include multiple grooves 138 and thus multiple sets of leading cutting edges 140 and trailing edges 142 spaced about its circumference.
- leading cutting edge 140 may extend outwardly from longitudinal axis 144 ( FIG. 4 ) further than trailing edge 142 depending on the application in which rivet assembly 100 is to be used, the material properties of the work pieces in which rivet assembly 100 is to be inserted, and the like.
- polishing leading edge 148 may extend outwardly from longitudinal axis 144 ( FIG. 4 ) further than polishing trailing edge 150 .
- FIG. 5B illustrates an auger 110 wherein grooves 138 are angled with respect to the longitudinal axis 144 ( FIG. 4 ) of the auger 110
- FIG. 5A illustrates an auger 110 wherein the grooves 138 are substantially straight (not angled).
- threads 154 may extend substantially about the barrel of self-tapping and self-polishing auger 110 . Threads 154 may extend between each leading cutting edge 140 and trailing edge 142 along the length of cutting portion 118 , thus, separating each leading cutting edge 140 and trailing edge 142 from longitudinally adjacent leading cutting edges or trailing edges. Preferably, as auger 110 is inserted into a work piece, threads 154 pull the head through the work piece material, reducing the amount of force required to drive the head through the work piece. Shoulder section 112 may have a convex surface for providing less resistance to rivet sleeve 104 ( FIG. 1 ).
- polishing portion 120 may be tapered. Threads 154 may blend smoothly into polishing portion 120 or, alternately, shoulder section 112 to provide a smooth transition for polishing of the aperture formed.
- FIGS. 4, 5A , and 5 B illustrate threads 154 as having a generally helical cone shape and extending between tip 116 and polishing portion 120 .
- the size and pitch of threads 154 may be varied, or the width or spacing of threads 154 may be increased or decreased as they progress along cutting portion 118 away from tip 116 .
- threads 154 may extend only partially along the length of the barrel of auger 110 from tip 116 to polishing portion 120 (as shown in FIG. 6B ), or may be eliminated entirely (as shown in FIG. 6C ) so that single leading cutting edges 140 and trailing edges 142 are formed.
- polishing edges 148 & 150 FIG. 4
- auger 110 may optionally include protruding finishing edges 152 which, in softer metals such as aluminum and the like, will function to remove any burr created by leading cutting edges 140 as the aperture in the work piece is formed.
- FIGS. 7 through 11 illustrate the application or insertion of a self-tapping and self polishing rivet assembly 10 , described in connection with FIGS. 1 through 5 , to join two or more work pieces (two work pieces 156 & 158 are shown).
- FIG. 7 depicts the rivet assembly 100 near the beginning of application.
- the self-tapping and self polishing auger 110 is held substantially normal to the outer work piece surface 160 while rotary motion is applied to the shank 114 of mandrel 108 . For instance, as described in the discussion of FIG.
- the rear portion of the shank 114 may be placed in a specialized chuck (not shown) and various types of power or hand tools (not shown) may be used to provide rotary motion and axial retraction to the mandrel 108 (see FIGS. 9, 10 and 11 ).
- Rotary motion applied to mandrel 108 causes self-tapping tip 116 to tap a hole or aperture in adjacent work pieces 156 & 158 .
- the rotary motion further drives threads 154 of head 110 into the work pieces 156 & 158 , pulling the auger 110 though the work pieces where cutting edges 140 & 142 incrementally shave or carve material from the surface of the aperture being formed. This removed material may then be channeled away from the aperture via groove 138 .
- the amount of torque required to insert or tap auger 110 through a work piece is substantially reduced compared to that required by augers of conventional self-boring rivet assemblies. Further, the material removed by auger 110 may be more easily removed since it is channeled to the outer surface 160 of work piece 156 .
- FIG. 8 illustrates rivet assembly 100 following the creation of an aperture through the work piece materials ( 156 & 158 ) by the self-tapping and self-polishing auger 110 .
- the rotary motion applied to shank 114 further causes polishing edges 148 & 152 to shave or carve additional material, burrs caused by leading cutting edges 140 and the like from the inner surface of the aperture, smoothing the aperture prior to insertion of rivet sleeve 104 .
- the outer diameter 130 of the shoulder section 112 is slightly larger than outer diameter 132 of rivet sleeve 104 allowing the sleeve to pass through the aperture formed.
- FIG. 9 depicts rivet assembly 100 following the application of a rearward tension force on shank 114 setting the rivet assembly 100 .
- the rear portion of the shank 114 may be grasped by a riveting tool, a grasping tool, or the like, and axially retracted away from the outer surface 160 of work piece 156 .
- This axial retraction causes shoulder section 112 to deform rivet sleeve 114 .
- shoulder section 112 (and self-tapping and self-polishing head 110 ) is drawn into rivet sleeve 104 , the tapered upper face of shoulder section 112 spreads the sleeve 104 radially.
- the weakened area of reduced diameter 118 is sized to break at a predetermined tensile load greater than the tensile load required to cause deformation of hollow tubular sleeve 104 , allowing the sleeve 104 to be fully deformed prior to separation of shank 114 .
- FIG. 10 depicts rivet assembly 100 following separation of shank 114 and setting.
- self-tapping and self-polishing auger 110 and shoulder section 112 are retained in rivet sleeve due to an interference between enlarged area 124 and the inner surface of the sleeve 104 .
- This interference may be created by deformation of the rivet sleeve 104 during application.
- the tapered upper face of shoulder section 112 may further deform the rivet sleeve 104 to at least partially encircle the head 110 to provide additional retention of the head 110 after application of the rivet assembly 100 .
- FIG. 11 illustrates a rivet assembly 200 in accordance with an alternative embodiment of the present invention wherein the self-tapping and self-polishing head and shoulder section detach from the rivet body following application of the rivet assembly.
- the shoulder section 204 of mandrel 206 may have a face 208 comprising a tapered inner section 210 and a flat-plate outer section 212 .
- the tapered inner section 210 initially spreads the lower end of rivet sleeve 214 .
- the flat-plate outer section 212 then flattens the sleeve 214 against the inner surface 216 of the innermost work piece 218 allowing the self-tapping and self-polishing head 202 and shoulder section 204 to drop off following separation of shank 220 .
- Shoulder section 204 may further include etchings or serrations 222 about its perimeter for smoothing and polishing the aperture formed by auger 202 .
- Rivet assembly 300 comprises a rivet body 302 having a hollow tubular rivet sleeve 304 and an enlarged flattened head 306 surrounding a mandrel 308 having a shank 310 having a self-tapping and self-polishing auger 312 .
- the self-tapping and self-polishing auger 312 is comprised of a generally conical threaded barrel 314 having a self-tapping tip 316 , a cutting portion 318 , and optionally a polishing portion 320 .
- self-tapping tip 316 is pointed (i.e., it does not include initial contact edge 136 ( FIG. 4 )) or has an initial contact edge 136 of nominal size) for forming or tapping an aperture in work piece by puncturing and separating work piece materials allowing the rivet assembly to be more easily tapped or started in the work piece.
- Staged leading cutting edges 326 and trailing edges 328 may be formed in the cutting portion 318 of auger 312 along groove 322 , rearward of self-tapping tip 316 . Like cutting edges 140 & 142 of FIGS. 1 through 5 , leading cutting edges 326 incrementally remove work piece material(s), which may then be channeled away by groove 322 . In this manner, the amount of torque required to insert rivet assembly 300 through a work piece is substantially reduced compared to conventional self-boring rivet assemblies. Further, like cutting edges 140 of FIGS.
- leading cutting edges 326 and trailing cutting edges 328 may be substantially parallel to the longitudinal axis 330 of auger 312 or may be angled with respect to the longitudinal axis 330 depending on the application in which rivet assembly 300 is to be used, the material properties of the work pieces in which rivet assembly 300 is to be inserted, the amount of material to be removed by each cutting edge 326 , and the like.
- polishing leading edge 332 and trailing edge 334 may be formed in the polishing portion 320 of self-tapping and self-polishing auger 312 along groove 322 rearward of cutting portion 318 and forward of shoulder portion 322 .
- polishing leading and trailing edges 332 & 334 remove any excurvations (e.g., material bored away from work piece by head 110 ) leaving a clean, substantially burr free, aperture through the work piece(s) through which rivet sleeve 304 may extend. Further, like polishing edges 148 & 150 of FIGS.
- polishing edges 332 & 334 may be substantially parallel to longitudinal axis 330 or may be angled with respect to the longitudinal axis 330 depending on the application in which rivet assembly 300 is to be used, the material properties of the work pieces in which rivet assembly 300 is to be inserted, the amount of material to be removed by each polishing edge 332 & 334 , and the like.
- FIGS. 14 through 16 illustrate bolt rivet assemblies in accordance with exemplary embodiments of the present invention.
- the bolt rivet assemblies 400 , 500 & 600 comprises a hollow rivet body 402 , 502 & 602 surrounding a mandrel 404 , 504 & 604 , respectively.
- each of the rivet bodies 402 , 502 & 602 includes a hollow tubular sleeve 406 , 506 & 606 and a threaded bolt head 408 , 508 & 608 separated by an enlarged flattened head or flange 410 , 510 & 610 .
- the rivet body 402 , 502 & 602 may be made of steel, aluminum, plastic, composite, or other desirable rivet material.
- the threaded portion of bolt head 408 , 508 & 608 may have multiple sets of threads.
- a separate head may be fashioned so that these multiple threads may strip its internal threads as it is being threaded onto the rivet body. Thus, once threaded onto the threaded portion, the head cannot be removed. In this fashion, the head may be tightened onto the rivet body and permanently retained.
- FIG. 14 depicts a rivet assembly 400 comprising a rivet body 402 including an enlarged flattened head or flange 410 having a concave inner face 418 and convex outer face 420 .
- a rivet assembly 400 comprising a rivet body 402 including an enlarged flattened head or flange 410 having a concave inner face 418 and convex outer face 420 .
- axial retraction of the mandrel 404 pulls the enlarged flattened head 410 against the outer surface 422 of the outer work piece 424 , compressing and flattening its concave inner face 418 .
- the concave inner face 418 attempts to retain its original shape causing the rim 430 of the inner face 418 to apply a spring-like force to the outer surface 422 .
- the head 410 may increase application strength and prevent rotation of the rivet body 400 with or without a locking washer or serrated inner surface.
- enlarged flattened head 510 may have a six-sided or hex design similar to a standard nut, or, may alternatively be cylindrical. Additionally, enlarged flattened head 510 may have serrated inner 524 (and outer) surfaces depending upon application requirements. These serrated surfaces 524 may function to increase surface friction between the rivet head 510 and the outer surface 526 of the work piece 528 to prevent rotation of bolt rivet assembly 500 eliminating the need for a lock washer ( FIG. 14 ). The serrated surfaces 524 may further function to prevent rotation of the bolt rivet assembly 500 during loosening and/or tightening of a nut onto the bolt head 508 . Alternately, as shown in FIG.
- weakened area 626 is positioned on mandrel 604 so that a length 628 of shank 616 remains in rivet body 602 after separation of the rear portion of the shank 616 .
- length 628 is predetermined to allow shank 616 to fracture at a point that is substantially flush with the end of bolt head 608 . In this manner, the length 628 substantially fills the hollow portion of the rivet body 602 , increasing its strength.
- FIGS. 1 through 16 illustrate augers designed to be rotated clockwise during insertion.
- augers illustrated herein may alternately be designed to be rotated counterclockwise during insertion without departing from the scope and spirit of the present invention.
- bolt heads are shown having clockwise threads.
- bolt heads in accordance with the present invention may also be reverse threaded (i.e., may have counterclockwise threads).
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Abstract
A blind setting rivet assembly capable of permanently fastening one or more sheet metal work pieces or the like together is disclosed. The rivet assembly may be self polishing and self tapping and may also provide a hollow cylindrical threaded bolt head onto which a nut may be affixed to provide a means to removably attach other work pieces, components or the like. The rivet assembly comprises a rivet body having a hollow tubular sleeve and an enlarged flattened head. The rivet body surrounds a mandrel that may have a weakened area of reduced diameter to allow detachment of the mandrel shaft following application of sufficient axial force to the shank. This application of force sets the rivet by causing a tapered shoulder section of the mandrel to deform the rivet sleeve. The mandrel shank may be terminated in a screw tip. This screw tip punctures, spreads, self-taps, and self-polishes an aperture in the work pieces through which the rivet sleeve passes. The mandrel's shank may have a weakened area of reduced diameter adjacent to the screw tip that allows detachment of shaft following application of sufficient axial force to the shank. This application of force causes the tapered shoulder section of the screw tip to compress and deform the rivet sleeve setting the rivet.
Description
- The present application is a continuation application claiming priority under 35 U.S.C. § 120 to the United States Non-Provisional patent application Ser. No. 10/050,084, filed on Jan. 14, 2002, which claimed priority under 35 U.S.C. § 119(e) of U.S. Provisional Application No. 60/261,650, filed Jan. 12, 2001. Said U.S. Non-Provisional patent application Ser. No. 10/050,084 and the U.S. Provisional Application No. 60/261,650 are herein incorporated by reference in their entireties.
- The following related commonly owned patents are incorporated herein by reference in their entirety:
Inventor Patent No. Issue Date Filing Date Aasgaard 5,741,099 Apr. 21, 1998 Jul. 12, 1996 Aasgaard 5,762,456 Jun. 9, 1998 Jul. 12, 1996 Aasgaard 5,915,901 Jun. 29, 1999 Oct. 27, 1997 - The present invention generally relates to the field of fasteners such as rivets and the like, and more particularly to a self-polishing and tapping rivet assembly.
- Blind setting rivets are typically used to fasten sheet metal work pieces or the like together when access is available to only one side of the work pieces. However, application of blind setting rivets may at times be cumbersome. For example, in many applications, special jigs must be used to maintain exact alignment of the work pieces from the time the hole is drilled until the rivet can be applied.
- Because of these and other limitations, self-drilling blind setting rivets were developed. These rivets employ specialized drill heads which may be difficult to manufacture and are thus prohibitively expensive for many applications. Further, such rivets may leave a burr on the outer layer of the work piece materials. This burr may prevent proper seating of the rivet and may cause fractures in work pieces as it is applied, resulting in a weak joint. Known to the art are self-drilling rivets having deburring ears to remove burrs during the drilling operation. However, the drill bit of such rivets removes work piece material to create a hole for the rivet shank. This removed material may fall within an enclosed area creating a possible nuisance or hazard.
- Typical drills have spirals designed to help the metal edges cut and spiral the shrapnel out. In a typical self-drilling rivet the spirals are designed to help the cut metal edges to create shrapnel which requires that high torque be placed on the mandrel of the rivet assembly.
- U.S. Pat. No. 5,915,901 describes the use of the excurvations formed during application to increase application strength. However, in some applications, a polished aperture is desirable. Consequently, it would be advantageous to provide a blind setting rivet that would be both self-tapping and self-polishing instead of only self drilling (using a drill bit) or only self-tapping (using a screw tip). Such a self-tapping, self-polishing rivet would remove all excurvations that would leave a clean aperture. Additionally, a self-tapping and self-polishing rivet would be less expensive and easier to manufacture than the self-drilling rivets (using a drill bit) and would require less torque during application.
- Accordingly, the present invention is directed to a self-tapping and self-polishing blind setting rivet assembly capable of permanently fastening one or more work pieces or the like together and/or to another object. In one embodiment, the rivet assembly may further include a hollow cylindrical threaded bolt head onto which a nut may be affixed to provide a means to removably attach other work pieces, components or the like.
- In exemplary embodiments of the invention, the self-tapping and self-polishing blind setting rivet assembly comprises a rivet body having a hollow tubular sleeve and an enlarged flattened head. The rivet body surrounds a mandrel having a weakened area of reduced diameter to allow detachment of the mandrel shaft following application of sufficient axial force to the shank. This application of force sets the rivet by causing a tapered shoulder section of the mandrel to deform the rivet sleeve. The mandrel shank is terminated in a self-tapping and self-polishing auger that punctures, spreads, self-taps and self-polishes an aperture in the work piece(s) through which the rivet sleeve passes. The self-tapping and self-polishing auger includes a generally longitudinally formed groove providing one or more cutting edges that incrementally shave or carve small amounts of work piece material allowing torque to be dispersed over several small cutting edges simultaneously.
- It is to be understood that both the forgoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention and together with the general description, serve to explain the principles of the invention.
- The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures in which:
-
FIG. 1 is a side elevational view illustrating a self-tapping and self-polishing blind setting rivet assembly in accordance with an exemplary embodiment of the present invention; -
FIG. 2 is a partial cross-sectional side elevational view illustrating the self-tapping and self-polishing blind setting bolt rivet assembly shown inFIG. 1 ; -
FIG. 3 is a side elevational view illustrating the mandrel of the rivet assembly shown inFIG. 1 ; -
FIG. 4 is a side elevational enlarged view illustrating the self-tapping and self-polishing head of the mandrel shown inFIG. 3 ; -
FIGS. 5A and 5B are a front elevational views further illustrating exemplary self-tapping and self-polishing augers in accordance with the present invention; -
FIGS. 6A, 6B and 6C are side elevational view illustrating alternative self-tapping and self-polishing augers in accordance with exemplary embodiments of the invention; -
FIG. 7 is a partial cross-sectional side elevational view of the rivet assembly shown inFIG. 1 depicting the rivet assembly at the beginning of application; -
FIG. 8 is a partial cross-sectional side elevational view of the rivet assembly shown inFIG. 1 depicting the rivet assembly following the separation and folding of an aperture through the work piece materials by the screw tip; -
FIG. 9 is a partial cross-sectional side elevational view of the rivet assembly shown inFIG. 1 depicting the rivet assembly after the application of a rearward force on the mandrel shank; -
FIG. 10 is a partial cross-sectional side elevational view of the rivet assembly shown inFIG. 1 illustrating separation of the upper shank from the screw tip and shoulder section; -
FIG. 11 is a partial cross-sectional side elevational view of an alternative embodiment of the present invention depicting the detachment of the auger and shoulder section following application; -
FIG. 12 is a partial cross-sectional, side elevational view illustrating a self-tapping and self-polishing blind setting rivet assembly in accordance with a second exemplary embodiment of the present invention; -
FIG. 13 is a side elevational view illustrating the mandrel of the rivet assembly shown inFIG. 12 ; -
FIG. 14 is a partial cross-sectional side elevational view illustrating a self-tapping and self-polishing blind setting bolt rivet assembly in accordance with an exemplary embodiment of the present invention, wherein the bolt rivet assembly is shown following application of rearward force on the mandrel shank causing separation of the upper shank and the screw tip; -
FIG. 15 is a partial cross-sectional side elevational view illustrating a self-tapping and self-polishing blind setting bolt rivet assembly depicting with a threaded enlarged flattened head in accordance with an exemplary embodiment of the present invention, wherein the bolt rivet assembly is shown following completion of self-tapping and self-polishing of an aperture prior to application; and -
FIG. 16 is a partial cross-sectional side elevational view illustrating a self-tapping and self-polishing blind setting bolt rivet assembly in accordance with an exemplary embodiment of the present invention, wherein the bolt rivet assembly is shown following application. - Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
- Referring generally now to
FIGS. 1 through 11 , a self-tapping and self-polishing, blindsetting rivet assembly 100 in accordance with an exemplary embodiment of the present invention is described. As shown,rivet assembly 100 comprises arivet body 102 having a hollowtubular rivet sleeve 104 and an enlargedflattened head 106 surrounding amandrel 108 having a self-tapping and self-polishing auger 110, ashoulder section 112, and ashank 114. In exemplary embodiments, therivet body 102 may be made of steel, aluminum, plastic, composite, or other desirable rivet material. Themandrel 108 may be made of steel, aluminum, plastic, composite, or other material, which is preferably of higher tensile strength than the rivet body material. - Self-tapping and self-polishing
auger 110 is comprised of a generally conical barrel having a self-tapping and self-polishingtip 116, a cuttingportion 118, and optionally a polishingportion 120. A weakened area ofreduced diameter 122 may be formed in themandrel shank 114 rearward fromshoulder section 112. This weakenedarea 122 is preferably sized to fracture upon application of a predetermined tensile force to theshank 114 allowing self-tapping and polishingauger 110 andshoulder section 112 to be detached fromshank 114 following completed application of therivet assembly 100. Likewise, an area ofenlarged diameter 124 may be formed inmandrel 108 betweenshoulder section 112 and weakened area ofreduced diameter 122. This area ofenlarged diameter 124 retainsmandrel 108 withinrivet body 102 until sufficient force is applied to theshank 114 during application to set therivet body 102 and cause the area ofreduced diameter 122 to fracture. In one embodiment, thisenlarged area 124 also retains the self-tapping and polishingauger 110 andshoulder section 112 withinsleeve 104 following application of therivet assembly 100 by creating an interference with the inner surface of thesleeve 104 as thesleeve 104 is deformed during application of the rivet. Moreover, in embodiments of the invention,mandrel 108 may include a grommet or like seal for providing a liquid and gas impermeable seal between theshank 114 and therivet body 102. As shown inFIGS. 2 and 3 , lengths orspaces 126 & 128 ofmandrel 108 may be provided betweenshoulder section 112 andenlarged portion 124 and betweenenlarged portion 124 and weakenedarea 122. However, in some applications thesespaces 126 & 128 may be eliminated. - In embodiments of the invention, weakened
area 122 may be positioned onmandrel 108 so that a length ofshank 114 remains inrivet body 102 after separation of the rear portion of theshank 114. Preferably, this length is predetermined to allowshank 114 to fracture at a point that is substantially flush with the outer surface of enlarged flattenedhead 106. In this manner, the remaining part ofshank 114 substantially fills the hollow portion of therivet body 102, increasing its strength. - It will be appreciated that the areas of reduced
diameter 122 andenlarged diameter 124 may have different cross-sectional shapes depending upon factors such as, for example, the material from which themandrel 108 is made, the types of work piece material(s) in which therivet assembly 100 is being applied, the amount of fracture strength required for the area ofreduced diameter 122, and the holding strength of the area ofenlarged diameter 124. For instance, inFIGS. 2 and 3 , the area ofreduced diameter 122 andenlarged diameter 124 are shown as having generally curved cross-sectional shapes. However, in other embodiments, these areas may have a V-shape, a rectangular shape, a faceted shape, or the like. - During application of
rivet assembly 100, self-tapping and polishingauger 110 is held substantially normal to the surface of a work piece while rotary motion is applied toshank 114. This rotary motion threads theauger 110 into the work piece materials and expands them. In this manner, theauger 110 pulls itself through the work piece materials while simultaneously smoothing the aperture it forms. Preferably, self-tapping and self-polishingtip 116 is pointed or angled to facilitate piercing of the outer surface of the work piece. - In exemplary embodiments, the rear portion of the
shank 114 may be designed for use with a specialized chuck or various types of power or hand tools to provide rotary motion and axial retraction to themandrel 108. Preferably, theouter diameter 130 ofshoulder section 112 is slightly larger thanouter diameter 132 ofrivet sleeve 104 allowing the sleeve to pass through the hole or aperture formed by self-tapping and self-polishingrivet head 110. - Referring now to
FIG. 4 , the self-tapping and self-polishingauger 110 ofmandrel 108 is described. As described in the discussion ofFIGS. 1 through 3 , self-tapping and self-polishingauger 110 is comprised of a generally conical barrel having a self-tappingtip 116, a cuttingportion 118, and optionally a polishingportion 120. In the embodiment illustrated, self-tappingtip 116 includes apoint 134 for piercing the surface of a work piece.Point 134, which may be centered on the longitudinal axis ofauger 110 or offset therefrom, extends into one or initial contact edges 136 suitable for forming a hole or aperture by puncturing, separating and then scraping or carving work piece material. Initial contact edges 136 may be angled and may be offset to assist in separating and tapping the work piece material(s). In this manner, self-tapping and self-polishingtip 116 facilitates initial insertion (tapping) of therivet assembly 100 allowing therivet assembly 100 to be more easily started in the work piece. - As shown in
FIG. 4 , agroove 138 is formed generally longitudinally in the cuttingportion 118 ofauger 110. Groove 138 may extend to various depths inauger 110 and may have a variety of shapes depending on factors such as, for example, the material of the work piece for which the rivet assembly 100 (FIG. 1 ) is to be used (e.g., steel, aluminum, plastic, etc). For example, as shown inFIGS. 4 and 5 , groove 138 may have a generally half-conical shape extending from self-tapping and polishingtip 116 toshoulder section 112 so that the depth ofgroove 138 increases uniformly through cuttingportion 118. However, it will be appreciated thatgroove 138 is not limited to this shape, but may have other shapes depending the materials of the work pieces in which the rivet assembly 100 (FIG. 1 ) is being inserted, and the like. For example, in one embodiment, groove 138 may extend only partially fromshoulder portion 112 ofauger 110 to tip 116 while in anotherembodiment groove 138 may have a constant depth betweentip 116 andshoulder portion 112 or may vary in depth or width in a non-uniform manner. - Staged leading
cutting edges 140 and trailingedges 142 may be formed in the cuttingportion 118 of self-tapping and self-polishingauger 110 alonggroove 138, rearward of self-tappingtip 116. Preferably, leading cuttingedges 140 incrementally remove work piece material(s) by shaving or carving the materials from the wall of the aperture being formed. The removed materials may then be channeled away from the aperture bygroove 138. In this manner, the amount of torque required for inserting or tappingrivet assembly 100 through a work piece is substantially reduced compared to conventional self-boring rivet assemblies. - In the exemplary embodiment shown, leading cutting
edges 140 and trailingedges 142 may be substantially parallel to thelongitudinal axis 144 of self-tapping and self-polishingauger 110. Alternately, as shownFIG. 6A , any or all of leadingcutting edges 140 and trailingedges 142 may be angled, thereby forming an angle (α) with respect tolongitudinal axis 144. As shown inFIG. 4 , leading cuttingedges 140 and trailingedges 142 are generally parallel tolongitudinal axis 144, angle (α) is substantially zero (0). Further, either or both of leadingcutting edges 140 and/or trailingedges 142 may be curved. - A polishing
leading edge 148 may be formed in the polishingportion 120 of self-tapping and self-polishingauger 110 alonggroove 138 rearward of cuttingportion 118 and forward ofshoulder portion 112. Similarly, apolishing trailing edge 150 may be formed in the polishingportion 120 alonggroove 138 oppositeleading edge 148. Preferably, polishing leading and trailingedges 148 & 150 remove any excurvations (e.g., material bored away from work piece by auger 110) leaving a clean, substantially burr free aperture formed in the work piece(s) through which rivet sleeve 104 (FIGS. 1 and 2 ) may pass. Further, either or both of polishingleading edge 148 and/or polishing trailingedge 150 may be curved. - In the exemplary embodiment shown, polishing leading
edge 148 and polishing trailingedge 150 may be substantially parallel to thelongitudinal axis 144 ofauger 110. Alternately, as shown inFIG. 6A , either one or both of polishingleading edge 148 and polishing trailingedge 150 may be angled, thereby forming an angle (β) with respect tolongitudinal axis 144. - By angling
cutting edges 140, trailingedges 142, polishing leadingedge 148 and/or polishing trailingedge 150, the amount of material removed during each turn ofauger 110 may be controlled. Generally, by selecting a larger value of angle (αa for an auger having a given length (l), a smaller amount of work piece material is removed by each leadingcutting edge 140. Likewise, by selecting a larger value of angle (β) for anauger 110 having a given length (l), a smaller amount work piece material is removed during each turn. Thus, it will be appreciated that the selection of angles (α) and (β) will depend on factors such as the application in which rivetassembly 100 is to be used and the material properties of the work pieces in which rivetassembly 100 is to be inserted, the amount of material to be removed by cutting and polishingedges 140 & 148, and the like. For example, in the embodiment shown inFIG. 4 , wherein polishingedges 148 and polishing trailingedge 150 are generally parallel tolongitudinal axis 144, angle (β) is substantially zero (0). Conversely, in the embodiment shown inFIG. 6A , polishingedges 148 & 150 are formed with an angle (β) equal to the taper of the cuttingportion 118 of self-tapping and self-polishingauger 110. According, the polishing edges 148 & 150 shown inFIG. 4 would remove more material from the work piece(s) during each turn ofauger 110 than the polishing edges shown inFIG. 6A . - Referring now to
FIGS. 5A and 5B , self-tapping and self-polishingauger 110 may includemultiple grooves 138 and thus multiple sets of leadingcutting edges 140 and trailingedges 142 spaced about its circumference. Moreover, leadingcutting edge 140 may extend outwardly from longitudinal axis 144 (FIG. 4 ) further than trailingedge 142 depending on the application in which rivetassembly 100 is to be used, the material properties of the work pieces in which rivetassembly 100 is to be inserted, and the like. Similarly, polishing leadingedge 148 may extend outwardly from longitudinal axis 144 (FIG. 4 ) further than polishing trailingedge 150.FIG. 5B illustrates anauger 110 whereingrooves 138 are angled with respect to the longitudinal axis 144 (FIG. 4 ) of theauger 110, whileFIG. 5A illustrates anauger 110 wherein thegrooves 138 are substantially straight (not angled). - Turning again to
FIG. 4 ,threads 154 may extend substantially about the barrel of self-tapping and self-polishingauger 110.Threads 154 may extend between each leadingcutting edge 140 and trailingedge 142 along the length of cuttingportion 118, thus, separating each leadingcutting edge 140 and trailingedge 142 from longitudinally adjacent leading cutting edges or trailing edges. Preferably, asauger 110 is inserted into a work piece,threads 154 pull the head through the work piece material, reducing the amount of force required to drive the head through the work piece.Shoulder section 112 may have a convex surface for providing less resistance to rivet sleeve 104 (FIG. 1 ). - In exemplary embodiment of the invention, polishing
portion 120 may be tapered.Threads 154 may blend smoothly into polishingportion 120 or, alternately,shoulder section 112 to provide a smooth transition for polishing of the aperture formed.FIGS. 4, 5A , and 5B illustratethreads 154 as having a generally helical cone shape and extending betweentip 116 and polishingportion 120. However, it will be appreciated that those of skill may employ other thread designs in the art without departing from the scope and spirit of the present invention. For example, the size and pitch ofthreads 154 may be varied, or the width or spacing ofthreads 154 may be increased or decreased as they progress along cuttingportion 118 away fromtip 116. - In embodiments of the invention shown in
FIGS. 6B and 6C ,threads 154 may extend only partially along the length of the barrel ofauger 110 fromtip 116 to polishing portion 120 (as shown inFIG. 6B ), or may be eliminated entirely (as shown inFIG. 6C ) so that single leadingcutting edges 140 and trailingedges 142 are formed. InFIG. 6C , polishingedges 148 & 150 (FIG. 4 ) are also eliminated so that leading cuttingedges 140 and trailingedges 142 extend the length ofauger 110 fromtip 116 toshoulder portion 112. As shown inFIG. 6C ,auger 110 may optionally include protruding finishingedges 152 which, in softer metals such as aluminum and the like, will function to remove any burr created by leading cuttingedges 140 as the aperture in the work piece is formed. -
FIGS. 7 through 11 illustrate the application or insertion of a self-tapping and self polishing rivet assembly 10, described in connection withFIGS. 1 through 5 , to join two or more work pieces (twowork pieces 156 & 158 are shown).FIG. 7 depicts therivet assembly 100 near the beginning of application. Preferably, the self-tapping andself polishing auger 110 is held substantially normal to the outerwork piece surface 160 while rotary motion is applied to theshank 114 ofmandrel 108. For instance, as described in the discussion ofFIG. 1 , the rear portion of theshank 114 may be placed in a specialized chuck (not shown) and various types of power or hand tools (not shown) may be used to provide rotary motion and axial retraction to the mandrel 108 (seeFIGS. 9, 10 and 11). - Rotary motion applied to mandrel 108 causes self-tapping
tip 116 to tap a hole or aperture inadjacent work pieces 156 & 158. As the self-tappingtip 116 punctures, spreads and cuts the work piece materials, removed material on theinner surface 160 of theinnermost work piece 152 is separated and scraped or carved away from the work piece. The rotary motion further drivesthreads 154 ofhead 110 into thework pieces 156 & 158, pulling theauger 110 though the work pieces where cuttingedges 140 & 142 incrementally shave or carve material from the surface of the aperture being formed. This removed material may then be channeled away from the aperture viagroove 138. In this manner, the amount of torque required to insert ortap auger 110 through a work piece is substantially reduced compared to that required by augers of conventional self-boring rivet assemblies. Further, the material removed byauger 110 may be more easily removed since it is channeled to theouter surface 160 ofwork piece 156. -
FIG. 8 illustratesrivet assembly 100 following the creation of an aperture through the work piece materials (156 & 158) by the self-tapping and self-polishingauger 110. As polishingportion 120 ofauger 110 passes though the aperture formed inwork pieces 156 & 158, the rotary motion applied toshank 114 furthercauses polishing edges 148 & 152 to shave or carve additional material, burrs caused by leading cuttingedges 140 and the like from the inner surface of the aperture, smoothing the aperture prior to insertion ofrivet sleeve 104. Preferably, theouter diameter 130 of theshoulder section 112 is slightly larger thanouter diameter 132 ofrivet sleeve 104 allowing the sleeve to pass through the aperture formed. Once the aperture is formed inwork pieces 156 & 158,rivet sleeve 104 may be inserted into the aperture until enlarged flattenedhead 106 abuts theouter surface 160 of theouter work piece 156. -
FIG. 9 depictsrivet assembly 100 following the application of a rearward tension force onshank 114 setting therivet assembly 100. To set therivet assembly 100, the rear portion of theshank 114 may be grasped by a riveting tool, a grasping tool, or the like, and axially retracted away from theouter surface 160 ofwork piece 156. This axial retraction causesshoulder section 112 to deformrivet sleeve 114. As shoulder section 112 (and self-tapping and self-polishing head 110) is drawn intorivet sleeve 104, the tapered upper face ofshoulder section 112 spreads thesleeve 104 radially. This action causes therivet sleeve 104 to be spread until it will no longer pass through the aperture created in thework pieces 156 & 158. Further, the deformed portion ofrivet sleeve 104 is pulled against theinner surface 162 of theinnermost work piece 154 tightening the rivet to thework pieces 152 & 154. Preferably, the weakened area ofreduced diameter 118 is sized to break at a predetermined tensile load greater than the tensile load required to cause deformation of hollowtubular sleeve 104, allowing thesleeve 104 to be fully deformed prior to separation ofshank 114. -
FIG. 10 depictsrivet assembly 100 following separation ofshank 114 and setting. In the embodiment shown, self-tapping and self-polishingauger 110 andshoulder section 112 are retained in rivet sleeve due to an interference betweenenlarged area 124 and the inner surface of thesleeve 104. This interference may be created by deformation of therivet sleeve 104 during application. In embodiments of the invention, the tapered upper face ofshoulder section 112 may further deform therivet sleeve 104 to at least partially encircle thehead 110 to provide additional retention of thehead 110 after application of therivet assembly 100. -
FIG. 11 illustrates arivet assembly 200 in accordance with an alternative embodiment of the present invention wherein the self-tapping and self-polishing head and shoulder section detach from the rivet body following application of the rivet assembly. In such embodiments, wherein self-tapping and self-polishingauger 202 is allowed to drop off, theshoulder section 204 ofmandrel 206 may have aface 208 comprising a taperedinner section 210 and a flat-plateouter section 212. Preferably, the taperedinner section 210 initially spreads the lower end ofrivet sleeve 214. The flat-plateouter section 212 then flattens thesleeve 214 against theinner surface 216 of theinnermost work piece 218 allowing the self-tapping and self-polishinghead 202 andshoulder section 204 to drop off following separation ofshank 220.Shoulder section 204 may further include etchings orserrations 222 about its perimeter for smoothing and polishing the aperture formed byauger 202. - Referring now to
FIGS. 12 and 13 , arivet assembly 300 employing a self-tapping and self-polishing head in accordance with a second exemplary embodiment of the present invention is described.Rivet assembly 300 comprises arivet body 302 having a hollowtubular rivet sleeve 304 and an enlarged flattenedhead 306 surrounding amandrel 308 having ashank 310 having a self-tapping and self-polishingauger 312. The self-tapping and self-polishingauger 312 is comprised of a generally conical threadedbarrel 314 having a self-tappingtip 316, a cuttingportion 318, and optionally a polishingportion 320. In the embodiment illustrated, self-tappingtip 316 is pointed (i.e., it does not include initial contact edge 136 (FIG. 4 )) or has aninitial contact edge 136 of nominal size) for forming or tapping an aperture in work piece by puncturing and separating work piece materials allowing the rivet assembly to be more easily tapped or started in the work piece. - A
groove 322 is formed generally longitudinally in the cuttingportion 318 ofbarrel 314. Groove 322 may extend to various depths inbarrel 314 and may have different shapes depending on the material of the work piece for which therivet assembly 300 is designed. For example, as shown, groove 322 may have a generally V-shaped cross-section extending from self-tappingtip 316 toshoulder section 320 wherein the depth ofgroove 322 increases longitudinally alongbarrel 314 fromtip 316 toshoulder section 324. - Staged leading
cutting edges 326 and trailingedges 328 may be formed in the cuttingportion 318 ofauger 312 alonggroove 322, rearward of self-tappingtip 316. Like cuttingedges 140 & 142 ofFIGS. 1 through 5 , leading cuttingedges 326 incrementally remove work piece material(s), which may then be channeled away bygroove 322. In this manner, the amount of torque required to insertrivet assembly 300 through a work piece is substantially reduced compared to conventional self-boring rivet assemblies. Further, like cuttingedges 140 ofFIGS. 1 through 5 B, leading cuttingedges 326 and trailingcutting edges 328 may be substantially parallel to thelongitudinal axis 330 ofauger 312 or may be angled with respect to thelongitudinal axis 330 depending on the application in which rivetassembly 300 is to be used, the material properties of the work pieces in which rivetassembly 300 is to be inserted, the amount of material to be removed by each cuttingedge 326, and the like. - Similarly, polishing leading
edge 332 and trailingedge 334 may be formed in the polishingportion 320 of self-tapping and self-polishingauger 312 alonggroove 322 rearward of cuttingportion 318 and forward ofshoulder portion 322. Like polishingedges 148 & 150 ofFIGS. 1 through 5 B, polishing leading and trailingedges 332 & 334 remove any excurvations (e.g., material bored away from work piece by head 110) leaving a clean, substantially burr free, aperture through the work piece(s) through which rivetsleeve 304 may extend. Further, like polishingedges 148 & 150 ofFIGS. 1 through 5 , polishingedges 332 & 334 may be substantially parallel tolongitudinal axis 330 or may be angled with respect to thelongitudinal axis 330 depending on the application in which rivetassembly 300 is to be used, the material properties of the work pieces in which rivetassembly 300 is to be inserted, the amount of material to be removed by each polishingedge 332 & 334, and the like. -
FIGS. 14 through 16 illustrate bolt rivet assemblies in accordance with exemplary embodiments of the present invention. Thebolt rivet assemblies hollow rivet body mandrel 404, 504 & 604, respectively. As shown, each of therivet bodies tubular sleeve bolt head flange rivet body mandrel 404, 504 & 604 may comprise a self-tapping and self-polishinghead head 110 shown inFIGS. 4 and 5 or, alternately,head 312 shown inFIGS. 12 and 13 ), ashoulder section 414 & 514 and ashank mandrel 404, 504 & 604 may be made of steel, aluminum, plastic composite, or other material that is preferably of higher tensile strength than the rivet body material. - In certain applications, it may be desirable for the threaded portion of
bolt head bolt rivet assemblies -
FIG. 14 depicts arivet assembly 400 comprising arivet body 402 including an enlarged flattened head orflange 410 having a concaveinner face 418 and convexouter face 420. Preferably, as therivet assembly 400 is applied, axial retraction of themandrel 404 pulls the enlarged flattenedhead 410 against theouter surface 422 of theouter work piece 424, compressing and flattening its concaveinner face 418. When the weakenedarea 426 onmandrel 404 fractures and theshank 416 is released, the concaveinner face 418 attempts to retain its original shape causing therim 430 of theinner face 418 to apply a spring-like force to theouter surface 422. This force holds the work pieces (424 & 432) snugly between thehead 410 and deformed portion of the rivet body'ssleeve 406. As a result, thehead 410 may increase application strength and prevent rotation of therivet body 400 with or without a locking washer or serrated inner surface. - The head or flange of the
rivet body removable heads 510 & 610). InFIG. 15 , arivet body 500 is depicted formed from asingle tube 518 having a threadedportion 520 abutting thesleeve portion 506 and formingbolt head 508. Enlarged flattenedhead 510 includes a threadedaperture 522 so that it may be threaded onto threadedportion 520, and is thus removable. In exemplary embodiments, enlarged flattenedhead 510 may have a six-sided or hex design similar to a standard nut, or, may alternatively be cylindrical. Additionally, enlarged flattenedhead 510 may have serrated inner 524 (and outer) surfaces depending upon application requirements. Theseserrated surfaces 524 may function to increase surface friction between therivet head 510 and theouter surface 526 of thework piece 528 to prevent rotation ofbolt rivet assembly 500 eliminating the need for a lock washer (FIG. 14 ). Theserrated surfaces 524 may further function to prevent rotation of thebolt rivet assembly 500 during loosening and/or tightening of a nut onto thebolt head 508. Alternately, as shown inFIG. 16 , alock washer 616 may be utilized in place of serrated surfaces for preventing rotation of therivet assembly 600 and removal of thehead 608.Lock washer 616 may encirclerivet sleeve 606 and be trapped between the enlarged flattened head and theupper surface 618 of awork piece 620. - In the embodiment shown in
FIG. 16 , weakenedarea 626 is positioned onmandrel 604 so that alength 628 ofshank 616 remains inrivet body 602 after separation of the rear portion of theshank 616. Preferably,length 628 is predetermined to allowshank 616 to fracture at a point that is substantially flush with the end ofbolt head 608. In this manner, thelength 628 substantially fills the hollow portion of therivet body 602, increasing its strength. -
FIGS. 1 through 16 illustrate augers designed to be rotated clockwise during insertion. However, it will be appreciated by those of skill in the art that the augers illustrated herein may alternately be designed to be rotated counterclockwise during insertion without departing from the scope and spirit of the present invention. Similarly, in FIGS. 14 though 16, bolt heads are shown having clockwise threads. However, bolt heads in accordance with the present invention may also be reverse threaded (i.e., may have counterclockwise threads). - It is believed that the self-polishing and tapping rivet assembly of the present invention and many of its attendant advantages will be understood by the forgoing description. It is also believed that it will be apparent that various changes may be made in the form, construction and arrangement of the components thereof without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely an explanatory embodiment thereof. It is the intention of the following claims to encompass and include such changes.
Claims (40)
1. A rivet assembly, comprising:
a rivet body having a hollow tubular sleeve and an enlarged flattened head suitable for abutting the surface of a work piece; and
a mandrel disposed in said rivet body, the mandrel including an auger having a groove generally longitudinally disposed therein for forming at least one cutting edge,
wherein the at least one cutting edge is suitable for incrementally shaving material from the work piece as said mandrel is rotated for creating an aperture capable of receiving the hollow tubular sleeve.
2. The rivet assembly as claimed in claim 1 , wherein the at least one cutting edge comprises a leading cutting edge and a trailing cutting edge formed on opposite sides of the groove.
3. The rivet assembly as claimed in claim 2 , wherein the leading cutting edge extends outwardly from a longitudinal axis of the auger further than the trailing cutting edge.
4. The rivet assembly as claimed in claim 1 , wherein the at least one cutting edge is parallel to a longitudinal axis of the auger.
5. The rivet assembly as claimed in claim 1 , wherein the at least one cutting edge forms an angle with respect a longitudinal axis of the auger.
6. The rivet assembly as claimed in claim 1 , wherein the at least one cutting edge is curved.
7. The rivet assembly as claimed in claim 1 , wherein the groove further forms at least one polishing edge suitable for polishing the aperture created by said at least one cutting edge.
8. The rivet assembly as claimed in claim 7 , wherein the at least one polishing edge comprises a leading polishing edge and a trailing polishing edge formed on opposite sides of the groove.
9. The rivet assembly as claimed in claim 8 , wherein the leading polishing edge extends outwardly from a longitudinal axis of the auger further than the trailing polishing edge.
10. The rivet assembly as claimed in claim 7 , wherein the at least one polishing edge is parallel to a longitudinal axis of the auger.
11. The rivet assembly as claimed in claim 7 , wherein the at least one polishing edge forms an angle with respect a longitudinal axis of the auger.
12. The rivet assembly as claimed in claim 7 , wherein the at least one polishing edge is curved.
13. The rivet assembly as claimed in claim 1 , wherein the auger comprises a tip suitable for self-tapping the aperture.
14. The rivet assembly as claimed in claim 13 , wherein the tip includes a point suitable for piercing the work piece, the point extending into a cutting tooth for removing work piece material.
15. The rivet assembly as claimed in claim 1 , wherein the auger further comprises a thread for pulling the auger through the work piece.
16. The rivet assembly as claimed in claim 15 , wherein the auger includes a tapered polishing portion having at least one polishing edge, and wherein the thread blends into the polishing portion.
17. The rivet assembly as claimed in claim 1 , further comprising a threaded bolt head extending from the enlarged flattened head opposite the hollow tubular sleeve.
18. The rivet assembly as claimed in claim 1 , wherein the mandrel further comprises a shoulder section adjacent to the auger, the shoulder section having an outer diameter greater than the inner diameter of the hollow tubular sleeve, the shoulder section being suitable for radially compressing and spreading the hollow tubular sleeve as said mandrel is retracted, and a shank having an area of reduced diameter spaced rearward from the shoulder section and sized for allowing the auger and shoulder section to be detached upon application of predetermined tensile force to the shank.
19. The rivet assembly as claimed in claim 18 , further comprising a threaded bolt head extending from the enlarged flattened head opposite the hollow tubular sleeve, wherein the area of reduced diameter is positioned substantially flush with an end of the bolt head after the auger and shoulder section are detached so that a length of the shank remains in the rivet body.
20. A rivet assembly, comprising:
a rivet body having a hollow tubular sleeve and an enlarged flattened head suitable for abutting the surface of a work piece; and
a mandrel disposed in said rivet body, the mandrel including an auger having a groove generally longitudinally disposed therein for forming at least one cutting and at least one polishing edge;
wherein the at least one cutting edge is suitable for incrementally shaving material from the work piece and as said mandrel is rotated for creating an aperture capable of receiving the hollow tubular sleeve, and
wherein the at least one polishing edge is suitable for polishing the aperture created by said at least one cutting edge.
21. The rivet assembly as claimed in claim 20 , wherein the at least one cutting edge comprises a leading cutting edge and a trailing cutting edge formed on opposite sides of the groove.
22. The rivet assembly as claimed in claim 20 , wherein the leading cutting edge extends outwardly from a longitudinal axis of the auger further than the trailing cutting edge.
23. The rivet assembly as claimed in claim 20 , wherein the at least one cutting edge is parallel to a longitudinal axis of the auger.
24. The rivet assembly as claimed in claim 20 , wherein the at least one cutting edge forms an angle with respect to a longitudinal axis of the auger.
25. The rivet assembly as claimed in claim 20 , wherein the at least one cutting edge is curved.
26. The rivet assembly as claimed in claim 20 , wherein the at least one polishing edge comprises a leading polishing edge and a trailing polishing edge formed on opposite sides of the groove.
27. The rivet assembly as claimed in claim 26 , wherein the leading polishing edge extends outwardly from a longitudinal axis of the auger further than the trailing polishing edge.
28. The rivet assembly as claimed in claim 20 , wherein the at least one polishing edge is parallel to a longitudinal axis of the auger.
29. The rivet assembly as claimed in claim 20 , wherein the at least one polishing edge forms an angle with respect a longitudinal axis of the auger.
30. The rivet assembly as claimed in claim 29 , wherein the at least one polishing edge is curved.
31. The rivet assembly as claimed in claim 20 , wherein the auger comprises a tip suitable for self-tapping the aperture.
32. The rivet assembly as claimed in claim 31 , wherein the tip includes a point suitable for piercing the work piece, the point extending into a cutting tooth for removing work piece material.
33. The rivet assembly as claimed in claim 20 , wherein the auger further comprises a thread for pulling the auger through the work piece.
34. The rivet assembly as claimed in claim 20 , further comprising a threaded bolt head extending from the enlarged flattened head opposite the hollow tubular sleeve.
35. The rivet assembly as claimed in claim 20 , wherein the mandrel further comprises a shoulder section adjacent to the auger, the shoulder section having an outer diameter greater than the inner diameter of the hollow tubular sleeve, the shoulder section being suitable for radially compressing and spreading the hollow tubular sleeve as said mandrel is retracted, and a shank having an area of reduced diameter spaced rearward from the shoulder section and sized for allowing the auger and shoulder section to be detached upon application of predetermined tensile force to the shank.
36. A rivet assembly, comprising:
a rivet body having a hollow tubular sleeve and an enlarged flattened head suitable for abutting the surface of a work piece; and
a mandrel disposed in said rivet body, the mandrel including an auger having a groove generally longitudinally disposed therein for forming means for cutting material from the work piece,
wherein the cutting means is suitable for incrementally shaving material from the work piece as said mandrel is rotated for creating an aperture capable of receiving the hollow tubular sleeve.
37. The rivet assembly as claimed in claim 36 , wherein the groove further forms means for polishing the aperture created by the cutting means.
38. The rivet assembly as claimed in claim 36 , wherein the auger further comprises means for self-tapping the aperture.
39. The rivet assembly as claimed in claim 36 , wherein the auger further comprises means for pulling the auger through the work piece.
40. The rivet assembly as claimed in claim 36 , further comprising a threaded bolt head extending from the enlarged flattened head opposite the hollow tubular sleeve.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/939,987 US20050207862A1 (en) | 2001-01-12 | 2004-09-13 | Self-polishing and tapping rivet assembly |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US26165001P | 2001-01-12 | 2001-01-12 | |
US10/050,084 US6796759B2 (en) | 2001-01-12 | 2002-01-14 | Self-polishing and tapping rivet assembly |
US10/939,987 US20050207862A1 (en) | 2001-01-12 | 2004-09-13 | Self-polishing and tapping rivet assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/050,084 Continuation US6796759B2 (en) | 2001-01-12 | 2002-01-14 | Self-polishing and tapping rivet assembly |
Publications (1)
Publication Number | Publication Date |
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US20050207862A1 true US20050207862A1 (en) | 2005-09-22 |
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ID=26727872
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US10/050,084 Expired - Fee Related US6796759B2 (en) | 2001-01-12 | 2002-01-14 | Self-polishing and tapping rivet assembly |
US10/939,987 Abandoned US20050207862A1 (en) | 2001-01-12 | 2004-09-13 | Self-polishing and tapping rivet assembly |
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US10/050,084 Expired - Fee Related US6796759B2 (en) | 2001-01-12 | 2002-01-14 | Self-polishing and tapping rivet assembly |
Country Status (8)
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US (2) | US6796759B2 (en) |
EP (1) | EP1409179B1 (en) |
AT (1) | ATE367227T1 (en) |
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DE (1) | DE60221252T2 (en) |
DK (1) | DK1409179T3 (en) |
ES (1) | ES2290272T3 (en) |
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Cited By (1)
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US20040171455A1 (en) * | 2001-07-11 | 2004-09-02 | Tillmann Korner | Web unit |
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Also Published As
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WO2002055231A3 (en) | 2003-06-05 |
US20020127080A1 (en) | 2002-09-12 |
US6796759B2 (en) | 2004-09-28 |
ATE367227T1 (en) | 2007-08-15 |
EP1409179B1 (en) | 2007-07-18 |
WO2002055231A2 (en) | 2002-07-18 |
EP1409179A4 (en) | 2005-04-13 |
DK1409179T3 (en) | 2007-11-12 |
WO2002055231A8 (en) | 2004-01-08 |
ES2290272T3 (en) | 2008-02-16 |
DE60221252D1 (en) | 2007-08-30 |
EP1409179A2 (en) | 2004-04-21 |
AU2002239914A1 (en) | 2002-07-24 |
DE60221252T2 (en) | 2008-04-17 |
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AS | Assignment |
Owner name: ASAR GROUP, INC., NEBRASKA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AASGAARD, PEPPER;REEL/FRAME:018198/0349 Effective date: 20060214 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |