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
  • 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

Definitions

• This invention relates to a rivet, and in the preferred embodiment provides a rivet which can readily be set without the use of a profiled setting die.
• Rivets comprising a head, a shank, and a poke extending into the shank from the end thereof remote from the head are known. In the prior art, such rivets have been so called “roll set” or "rose set”. In roll setting, the material of the
• a rivet having a head, a shank, and a poke, the poke extending into the shank from the end thereof remote from the head whereby the end region of the 5 shank remote from the head is annular, wherein the annular region of the shank includes a plurality of longitudinally extending zones of weakness along which the material of the shank will split when the annular region is forced radially outwardly.
• the zones of weakness can conveniently be provided by making the outer surface of the shank circular in transverse cross-section, and by making
• the poke polygonal is a minimum, and a zone of weakness is formed.
• the cross-section of the poke is a regular hexagon. In this case, the material of the shank will split into six legs during setting, thereby providing for a six leg rose setting of the rivet.
• the free end of the shank i.e. the end remote from the head, extends obliquely 5 to the axis of the shank from an edge at the outer periphery of the shank radially inwardly and axially towards the head.
• an angled lead-in to the poke is provided, and as the rivet is forced into the item to be riveted, the end of the shank acts as a cam surface, causing a radially outward ' force to be applied to the annular part of the shank.
• This radially outward force is sufficient to split the material of the shank along the zones of weakness. In this way, a rose set can be obtained using a flat bottom anvil, i.e.
• a passage extends from the poke through the shank and head of the rivet.
• the passage and poke together form a through hole in the rivet.
• the hole provides an aperture for the escape of displaced component material. This again assists in reducing the material displacement of the rear side of the joint and further reduces the setting load required to form a low profile joint.
• the displaced material which fills the through passage of the set rivet resists inward movement of the material of the shank thereby improving the strength and particularly the shear strength, of the rivet.
• the head of the rivet is solid, and material displaced during setting is not visible from the head side of the riveted material.
• Figure 1 shows a side view of a preferred embodi- ment of self-piercing rivet
• Figure 2 is a bottom plan view of the rivet of Figure 1;
• FIG 3 is an axial cross-section of a second embodiment.
• the rivet 1 shown in Figures 1 and 2 comprises a head 2 and a shank 3 •
• a poke 4 extends from the end 5 of the rivet remote from the head 2 into the shank to approx ⁇ imately half the depth of the shank.
• the outer periphery of the shank 3 is circular in transverse cross-section, whilst the poke 4 is hexagonal in transverse cross-section. Accordingly, at each apex of the poke the material of the shank is relatively thin, thereby defining a zone of weakness 6. It will be appreciated that the use of a hexagonal poke provides six zones of weakness 6 symmetrically disposed about the shank 3 •
• the free end of the shank 5 extends obliquely to the longitudinal axis of the shank from an edge 7 defined at the periphery of the shank radially inwardly and axially towards the head. Accordingly, an angled lead-in surface 8 is formed extending from the edge 7 to the poke 4• It will be appreciated that if the rivet 1 is used as a sel -piercing rivet, as the rivet is forced into material to be riveted, the surface 8 acts as a cam surface causing a radially outward force to be applied to the end region of the shank.
• the radial force generated by the earning action will be sufficient to split the shank along the zones of weakness 6, thereby rose setting the rivet without the use of a profiled setting die.
• a passage 9 extends from the poke through the shank and head of the rivet, the passage 9 and poke 4 together defining a through-hole in the rivet.
• the through hole provides a space for material displaced by the rivet. This not only reduces the setting force required and reduces the amount of material displacement on the tail side of the set joint, but also assists in strengthening the rivet since the displaced material will fill the through hole, thereby resisting both tensile and shear deformation of the set rivet.
• the rivet 10 shown in Figure 3 is similar to that of Figures 1 and 2 in that it includes a shank 3 which has a circular external profile, a hexagonal poke 4, and an angled lead-in surface 8.
• the head 11 of the rivet is solid whereby material displaced during setting is not visible from the head-side of the riveted material.
• the poke is tapered slightly in order to ease manufacture and to reduce setting loads.
• a tapered poke may, if desired, be used in the embodiment of Figures 1 and 2.
• the rivets illustrated in the drawings may be used as self-piercing rivets which can be rose set using only the setting load applied to the head of the rivet and a ' flat anvil to support the material being riveted.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Insertion Pins And Rivets (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10561019

Family Applications (1)

Country Status (6)

Families Citing this family (7)

Family Cites Families (4)

• 1984
  • 1984-05-16 GB GB848412432A patent/GB8412432D0/en active Pending
• 1985
  • 1985-05-16 GB GB08600808A patent/GB2172951B/en not_active Expired
  • 1985-05-16 EP EP85902099A patent/EP0181881A1/en not_active Withdrawn
  • 1985-05-16 AU AU43539/85A patent/AU4353985A/en not_active Abandoned
  • 1985-05-16 WO PCT/GB1985/000207 patent/WO1985005414A1/en unknown
  • 1985-05-16 ES ES1985286769U patent/ES286769Y/es not_active Expired
  • 1985-05-17 ZA ZA853753A patent/ZA853753B/xx unknown

Non-Patent Citations (1)

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