There is provided a blind rivet including an axially extending hollow tubular body having a tail end face at one end and a pre-formed radially enlarged flange at the other end, together with a mandrel having a stem which extends co-axially though the body and having enlarged head adjacent the tail e
There is provided a blind rivet including an axially extending hollow tubular body having a tail end face at one end and a pre-formed radially enlarged flange at the other end, together with a mandrel having a stem which extends co-axially though the body and having enlarged head adjacent the tail end of the body, the stem having a weakened region immediately adjacent the head. There is also provided a method of fastening at least two workpieces using such a blind rivet, including providing the blind side of the workpieces with a countersunk region to accommodate the conically deformed tail end of the body after setting, substantially flush therewith.
대표청구항▼
The invention claimed is: 1. A method of fastening together workpieces using a blind rivet, the method comprising: (a) using a blind rivet having a hollow central body segment, a tool-side flange and a blind-side end; (b) creating a hole in the workpieces with countersunk depressions in tool-side a
The invention claimed is: 1. A method of fastening together workpieces using a blind rivet, the method comprising: (a) using a blind rivet having a hollow central body segment, a tool-side flange and a blind-side end; (b) creating a hole in the workpieces with countersunk depressions in tool-side and blind-side surfaces of the workpieces; (c) inserting the rivet body segment and the blind-side end in the hole; (d) applying an axial setting force to the rivet body by use of a removable head having a conical shoulder, the head being mounted on an elongated shaft operably extending through the rivet body segment; (e) compressing the tool-side flange of the rivet into the countersunk depression in the tool-side surface of the workpieces, wherein all of the tool-side flange is substantially flush with or below the tool-side surface after setting, the tool-side flange having a greater wall thickness between its inside and outside diameters than the wall thickness of the body segment both before and after setting; (f) deforming the blind-side end of the rivet outwardly into the countersunk depression in the blind-side surface of the workpieces, wherein all of the blind-side end is substantially flush with or below the blind-side surface after setting; (g) the workpiece hole being radially larger than the central body segment of the rivet prior to setting, and radially expanding the central body segment of the rivet within the workpiece hole during setting; and (h) a bore of the rivet body segment being unobstructed after setting. 2. The method of claim 1 wherein the rivet body segment and flange have a continuous and uniformly sized bore therethrough, at least prior to rivet setting. 3. The method of claim 1 wherein the rivet flange has a substantially conical outside shape. 4. The method of claim 1 wherein the rivet flange is pre-shaped into an enlarged configuration prior to rivet setting. 5. The method of claim 1 further comprising creating a bulbously curved outside surface adjacent the blind-side end during the deforming step. 6. The method of claim 1 further comprising intentionally breaking the shaft during rivet setting. 7. The method of claim 1 further comprising inserting the shaft and rivet body segment together into the hole of the workpieces, the shaft snugly fitting within the rivet body segment during the insertion. 8. The method of claim 1 further comprising setting the blind rivet so that a tool-facing surface and an opposite blind surface of the blind rivet are substantially parallel to each other and to the corresponding tool and blind-side surfaces of the workpieces after the setting. 9. The method of claim 1 further comprising inserting the blind rivet into a computer cabinet. 10. A method of fastening together at least two workpieces using a blind rivet, the method comprising: (a) selecting a blind rivet having: (i) an integral pre-formed flange, and (ii) a body with a length between 25% and 55% greater than the combined thickness of the workpieces, and having a known outer diameter, the flange having a greater wall thickness than that of the body at least before setting; (b) pre-forming a hole in the workpieces having a diameter between 9% and 15% greater than the known outer diameter; (c) inserting the rivet body through the hole; and (d) applying an axial setting force to the rivet body by use of a mandrel head having a conical shoulder; wherein the setting force has a first axial component which is exerted in the axial direction to compress the rivet body into the hole, and a second angular component to deform the rivet body conically outwards; and wherein the workpiece hole is radially larger than the body of the rivet prior to setting, and radially expanding the body of the rivet within the workpiece hole during setting. 11. The method of claim 10 wherein the hole forming step comprises creating the blind side of the hole with a countersunk region, so that the conical deformation of the rivet body is deformed into the countersunk region of the hole. 12. The method of claim 10 further comprising using the rivet body and integral pre-formed flange with a continuous and uniform diameter bore therethrough, at least prior to rivet setting. 13. The method of claim 10 wherein the pre-formed flange has a substantially conical outside shape and a cross-sectional wall thickness greater than a cross-sectional wall thickness of the rivet body, both before and after rivet-setting. 14. The method of claim 10 further comprising setting the blind rivet such that all of the rivet is located between planes defined by outer surfaces of the at least two workpieces. 15. The method of claim 10 further comprising intentionally breaking a mandrel shaft during rivet-setting to remove the mandrel head from the rivet body. 16. A method of fastening workpieces using a blind rivet, the method comprising: (a) inserting the blind rivet into a hole in the workpieces; (b) locating a pre-expanded tool-side flange of the rivet, with a substantially cylindrical outside surface, into a countersunk opening in a tool-side surface of the workpieces; (c) setting the blind rivet to the workpieces by compressing a blind-end of the rivet into a countersunk opening in a blind-side surface of the workpieces; (d) allowing a bore in the rivet to be unobstructed and to have a substantially uniform inside dimension within at least the tool-side flange and a central body segment immediately adjacent to the flange, after the setting; and (e) the workpiece hole being radially larger than the central body segment of the rivet prior to setting, and radially expanding the central body segment of the rivet within the workpiece hole during setting. 17. The method of claim 16 further comprising creating a substantially bulbously curved outside surface adjacent the blind-side end during the setting. 18. The method of claim 16 further comprising inserting a mandrel and rivet body segment together into the hole of the workpieces, the mandrel snugly fitting within the rivet body segment during the insertion. 19. The method of claim 16 further comprising setting the blind rivet so that a tool-facing surface and an opposite blind surface of the blind rivet are substantially parallel to each other and to the corresponding tool and blind-side surfaces of the workpieces. 20. The method of claim 16 further comprising inserting the blind rivet into a computer cabinet. 21. The method of claim 16 further comprising compressing and expanding the blind-end of the rivet by pulling on a mandrel, the mandrel including an enlarged head adjacent to the blind-end, an elongated stem and a tapered shoulder located between the head and the stem. 22. The method of claim 16 further comprising intentionally breaking a mandrel attached to the blind rivet during the setting. 23. A method of fastening comprising: (a) inserting a blind rivet into a hole in at least one computer workpiece, inserting a mandrel and the attached rivet body segment together into the hole of the at least one computer workpiece, the mandrel snugly fitting within the rivet body segment during the insertion; (b) locating a pre-expanded tool-side flange, with a substantially cylindrical outside surface, entirely into a depression in a tool-side surface of the at least one computer workpiece; (c) compressing a blind-end of the rivet into a depression in a blind-side surface of the at least one computer workpiece; and (d) allowing a bore of the rivet to be unobstructed and to have a substantially uniform inside dimension within at least the tool-side flange and a central body segment immediately adjacent to the flange, after the setting. 24. The method of claim 23 further comprising creating a substantially curved and bulbous outside surface adjacent the blind-side end during the compressing. 25. The method of claim 23 further comprising setting the tool-side flange and blind-end of the rivet substantially flush with respective outside surfaces of the at least one computer workpiece. 26. The method of claim 23 further comprising setting the blind rivet so that a tool-facing surface and an opposite blind surface of the blind rivet are substantially parallel to each other and to the corresponding tool and blind-side surfaces of the at least one computer workpiece. 27. The method of claim 23 further comprising intentionally breaking a mandrel attached to the blind rivet during the setting. 28. The method of claim 23 further comprising outwardly expanding the blind-end of the blind rivet with a tapered shoulder on a mandrel, and inserting a substantially pointed blind-end of the mandrel into the hole in the at least one computer workpiece prior to inserting the blind rivet into the hole. 29. The method of claim 23 further comprising countersinking a substantially conical shape in outside surfaces of the at least one computer workpiece for the depressions.
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