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A blind rivet assembly is provided. In another aspect of the present invention, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect of the present

A blind rivet assembly is provided. In another aspect of the present invention, a blind rivet has ends that are received within countersinks in one or more workpieces and a mandrel head is completely pulled through the rivet without being severed from a mandrel stem. A further aspect of the present invention includes a mandrel with one or more ribs located on an outwardly tapering shoulder.

대표청구항 ▼

The invention claimed is: 1. A rivet assembly comprising: at least one workpiece having a first outer surface and an opposite second outer surface, a countersink located in each outer surface connected by a hole; a blind rivet comprising a body and a tool-side flange, the body including a cylindric

The invention claimed is: 1. A rivet assembly comprising: at least one workpiece having a first outer surface and an opposite second outer surface, a countersink located in each outer surface connected by a hole; a blind rivet comprising a body and a tool-side flange, the body including a cylindrical outside surface from the flange to a blind end prior to rivet setting, and a surface of the flange tapering outwardly from the outside surface of the body; and a mandrel comprising an elongated stem and a head, the stem extending through the rivet prior to setting, the head being laterally larger than the stem prior to rivet setting, and an outwardly tapering shoulder located on the head adjacent the stem, the shoulder further comprising first and second different surfaces; the head being completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel, and the mandrel being discarded after setting the blind rivet; the pulling through of the head during setting causing the blind end of the rivet body to outwardly expand into the adjacent countersink; the flange of the rivet being located in the adjacent countersink after rivet setting; and at least one rib projecting from the shoulder of the mandrel. 2. The rivet assembly of claim 1, wherein the at least one rib comprises at least two ribs, the ribs being elongated in a direction substantially coinciding with a direction of elongation of the stem, and the rivet body is unsevered after the ribs pass through the blind rivet during rivet setting. 3. The rivet assembly of claim 1, wherein the rib creates a depressed groove in a bore of the rivet body adjacent at least the blind end during rivet setting. 4. The rivet assembly of claim 1, wherein at least one of the surfaces of the shoulder of the mandrel has a frusto-conical, tapered shape. 5. The rivet assembly of claim 1, wherein at least one of the surfaces of the shoulder of the mandrel has a curved, tapered shape when viewed from a side of the mandrel. 6. A rivet assembly comprising: at least one workpiece having a first outer surface and an opposite second outer surface, a countersink located in each outer surface connected by a hole; a blind rivet comprising a body and a tool-side flange, the body including a cylindrical outside surface from the flange to a blind end prior to rivet setting, and a surface of the flange tapering outwardly from the outside surface of the body; and a mandrel comprising an elongated stem and a head, the stem extending through the rivet prior to setting, the head being laterally larger than the stem prior to rivet setting, and an outwardly tapering shoulder located on the head adjacent the stem, the shoulder further comprising two differently angled and frusto-conical, tapered surfaces; the head being completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel, and the mandrel being discarded after setting the blind rivet; the pulling through of the head during setting causing the blind end of the rivet body to outwardly expand into the adjacent countersink; and the flange of the rivet being located in the adjacent countersink after rivet setting. 7. The rivet assembly of claim 6, wherein the at least one workpiece includes a pair of electrical device components. 8. The rivet assembly of claim 7, wherein at least one of the electric device components includes a computer housing. 9. The rivet assembly of claim 6, further comprising an end of the mandrel head opposite the stem includes a concave surface. 10. The rivet assembly of claim 6, further comprising an end of the mandrel head opposite the stem includes a convex surface. 11. The rivet assembly of claim 6, wherein the head of the mandrel inwardly deforms during rivet setting. 12. The rivet assembly of claim 6, wherein the rivet and mandrel have the following relationship before rivet setting: an outside diameter of the mandrel head is equal to or between 3.5 mm and 2.9 mm, and an outside diameter of the blind end of the rivet body is equal to or between 3.08 mm and 2.9 mm. 13. The rivet assembly of claim 6, wherein an axial thickness of the mandrel head, not including the shoulder, is equal to or between 1.0 mm and 0.35 mm before rivet setting, and a nominal angle of the mandrel shoulder is equal to or between 110° and 90° as measured from one side to the other of the shoulder before rivet setting. 14. The rivet assembly of claim 6, further comprising a setting tool operably setting the blind rivet to the workpiece from a single side of the workpiece, the setting tool comprising at least one jaw operably pulling the mandrel stem and a nosepiece operably abutting against the tool-side flange, and a piston of the tool operably causing the mandrel to be pulled through the rivet, the blind rivet being attached to the mandrel through an interference fit before the mandrel is inserted into the tool. 15. A rivet assembly comprising: a first workpiece including a substantially frusto-conical depression; at least a second workpiece including a substantially frusto-conical depression; a blind rivet comprising a tool end and an opposite blind end, the rivet including a through-bore; and a mandrel comprising a stem and a head, the stem being located in the through-bore of the rivet at least prior to rivet setting, the mandrel head including a shoulder which laterally enlarges from the stem to a blind end of the mandrel head, and at least one rib projecting from the mandrel shoulder at least prior to rivet setting; the shoulder of the mandrel including two differently angled and frusto-conical, tapered surfaces; the stem of the mandrel including a continuously cylindrical shape immediately adjacent to the shoulder of the mandrel; the mandrel head outwardly expanding the blind end of the rivet into the adjacent depression during rivet setting and the mandrel head deforming while being pulled through the rivet during rivet setting; and the rivet portion adjacent the tool end having a substantially frusto-conical outside surface located in the adjacent depression at least after rivet setting. 16. The rivet assembly of claim 15, wherein the head of the mandrel is completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel. 17. The rivet assembly of claim 15, wherein the at least one rib comprises at least two ribs, the ribs being elongated in a direction substantially coinciding with a direction of elongation of the stem, and the rivet body is unsevered after the ribs pass through the blind rivet during rivet setting. 18. The rivet assembly of claim 15, wherein the rib creates a depressed groove in the rivet during rivet setting. 19. The rivet assembly of claim 15, wherein there is a lateral gap between an outside diameter of the rivet and the narrowest hole portions connecting the depressions in the workpieces before rivet setting but not after rivet setting. 20. The rivet assembly of claim 15, further comprising an end of the mandrel head opposite the stem includes a concave surface. 21. The rivet assembly of claim 15, further comprising an end of the mandrel head opposite the stem includes a convex surface. 22. The rivet assembly of claim 15, wherein the head of the mandrel inwardly deforms during rivet setting. 23. The rivet assembly of claim 15, wherein the rivet and mandrel have the following relationship before rivet setting: an outside diameter of the mandrel head is equal to or between 3.5 mm and 2.9 mm, and an outside diameter of the blind end of the rivet is equal to or between 3.08 mm and 2.9 mm. 24. The rivet assembly of claim 15, wherein an axial thickness of the mandrel head, not including the shoulder, is equal to or between 1.0 mm and 0.35 mm before rivet setting, and a nominal angle of the mandrel shoulder is equal to or between 110° and 90° as measured from one side to the other of the shoulder before rivet setting. 25. A rivet assembly comprising: a first workpiece including a substantially frusto-conical depression; at least a second workpiece including a substantially frusto-conical depression; a blind rivet comprising a tool end and an opposite blind end, the rivet including a through-bore, the rivet further including a body having a circular-cylindrical outside surface; and a mandrel comprising a stem and a head, the stem being located in the through-bore of the rivet at least prior to rivet setting, the mandrel head including a shoulder which laterally enlarges from the stem to a blind end of the mandrel head, the shoulder of the mandrel further comprising two differently shaped surfaces in a longitudinally stepped and coaxially positioned arrangement prior to rivet setting; the mandrel head outwardly expanding the blind end of the rivet into the adjacent depression during rivet setting; wherein the head of the mandrel is completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel; the tool end and blind end of the rivet being flush or below flush of a tool-surface and a blind-surface of the workpieces; and the head of the mandrel deforming and having a reduced lateral cross-sectional area during rivet setting; and at least one rib projecting from the shoulder of the mandrel. 26. The rivet assembly of claim 25 wherein the at least one rib comprises at least two ribs, the ribs being elongated in a direction substantially coinciding with a direction of elongation of the stem, and the rivet body is unsevered after the ribs pass through the blind rivet during rivet setting. 27. The rivet assembly of claim 25, wherein at least one of the surfaces of the shoulder of the mandrel has a frusto-conical, tapered shape. 28. The rivet assembly of claim 25, wherein at least one of the surfaces of the shoulder of the mandrel has a curved, tapered shape when viewed from a side of the mandrel. 29. A rivet assembly comprising: a first workpiece including a substantially frusto-conical depression; at least a second workpiece including a substantially frusto-conical depression; a blind rivet comprising a tool end and an opposite blind end, the rivet including a through-bore, the rivet further including a body having a circular-cylindrical outside surface; and a mandrel comprising a stem and a head, the stem being located in the through-bore of the rivet at least prior to rivet setting, the mandrel head including a shoulder which laterally enlarges from the stem to a blind end of the mandrel head, the shoulder of the mandrel further comprising two differently angled frusto-conical, tapered surfaces in a longitudinally stepped and coaxially positioned arrangement prior to rivet setting; the mandrel head outwardly expanding the blind end of the rivet into the adjacent depression during rivet setting; wherein the head of the mandrel is completely pulled through the rivet during rivet setting without severing the head from the stem of the mandrel; the tool end and blind end of the rivet being flush or below flush of a tool-surface and a blind-surface of the workpieces; and the head of the mandrel deforming and having a reduced lateral cross-sectional area during rivet setting. 30. The rivet assembly of claim 29, further comprising an end of the mandrel head opposite the stem includes a concave surface. 31. The rivet assembly of claim 29, further comprising an end of the mandrel head opposite the stem includes a convex surface. 32. The rivet assembly of claim 29, wherein the rivet and mandrel have the following relationship before rivet setting: an outside diameter of the mandrel head is equal to or between 3.5 mm and 2.9 mm, and an outside diameter of the blind end of the rivet is equal to or between 3.08 mm and 2.9 mm. 33. The rivet assembly of claim 29, wherein an axial thickness of the mandrel head, not including the shoulder, is equal to or between 1.0 mm and 0.35 mm before rivet setting, and a nominal angle of the mandrel shoulder is equal to or between 110° and 90° as measured from one side to the other of the shoulder before rivet setting. 34. The rivet assembly of claim 29, wherein there is a lateral gap between an outside diameter of the rivet and the narrowest hole portions connecting the depressions in the workpieces before rivet setting but not after rivet setting. 35. A rivet assembly comprising: (a) a blind rivet comprising a tool end, an opposite blind end, and a rivet body between the ends, the tool end having a greater wall thickness as compared to a wall thickness of the adjacent rivet body, the rivet including a through-bore extending through the entire rivet, the rivet body having a circular-cylindrical outside surface in a pre-set condition; and (b) a mandrel comprising a stem and a head, the stem being located in the through-bore of the rivet in an interference fit manner prior to rivet setting, the mandrel head including a shoulder which laterally enlarges from the stem to the mandrel head; the shoulder of the mandrel further comprising a first circumferentially continuous surface located adjacent the stem and at least a second and distinct surface located between the first surface and the head, the surfaces of the shoulder being coaxially aligned, differently angled, frusto-conical, and tapered prior to rivet setting; and the head of the mandrel being configured for completely pulling through the rivet during rivet setting without severing the head from the stem of the mandrel, the head of the mandrel being configured for deforming during the pulling through. 36. The rivet assembly of claim 35, wherein the rivet is unsevered during rivet setting. 37. The rivet assembly of claim 35, further comprising workpieces fastened together by the rivet, the workpieces including a countersink in a blind side thereof and a countersink in a tool side thereof, the ends of the rivet being located in the respective countersinks in a substantially flush or below flush condition after rivet setting. 38. The rivet assembly of claim 35, further comprising an end of the mandrel head opposite the stem includes a concave surface. 39. The rivet assembly of claim 35, wherein the rivet and mandrel have the following relationship before rivet setting: an outside diameter of the mandrel head is equal to or between 3.5 mm and 2.9 mm, and an outside diameter of the blind end of the rivet body is equal to or between 3.08 mm and 2.9 mm. 40. The rivet assembly of claim 35, wherein an axial thickness of the mandrel head, not including the shoulder, is equal to or between 1.0 mm and 0.35 mm before rivet setting, and a nominal angle of the mandrel shoulder is equal to or between 110° and 90° as measured from one side to the other of the shoulder before rivet setting.