Multi-grip blind rivet

a multi-grip, blind rivet technology, applied in the direction of screws, dowels, fastening means, etc., can solve the problems of uneven performance, cracking of the groove base, and the above-described multi-grip blind rivets, and achieve excellent performan

Inactive Publication Date: 2007-07-05
NEWFREY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The design ensures excellent performance across a wide range of workpiece materials and thicknesses, preventing mandrel head protrusion and workpiece splitting, while maintaining stability and resistance to setting loads, thereby ensuring secure assembly and reduced risk of rivet body failure.

Problems solved by technology

The setting performance of the above-described multi-grip blind rivet, commonly configured either with grooves or swaged indentations along the rivet body, does not perform well where the materials of the workpieces are soft and / or friable, especially where the holes are oversize and there are extremes of grip thickness.
For example, if the groove is too deep, cracking of the base of the groove will occur upon setting of the rivet.
If the groove is too shallow, there will not be sufficient resistance to prevent the mandrel head from pulling into, or even through, the rivet body.
This condition, together with normal manufacturing variations in mandrel crimp breakload, could lead to either premature rivet body failure or the pulling of the mandrel head into the rivet body.
With this type of rivet, body rupturing is avoided, but only small variations in indentation depth and mandrel crimp break load could result in an incomplete setting or the mandrel head being pulled through the rivet body.
However, this structure can cause fracture of the rivet body, due partly to the thinness of the material of the body and partly to the degree of material work hardening.
In extreme cases, the result is that the portion of the mandrel shaft extending from the mandrel head can protrude beyond the flange, thereby creating a potentially hazardous condition.
Such a condition could cause excessive radial expansion of the rivet body resulting in splitting of the workpiece material as the radial expansion takes place within the hole of the workpiece.

Method used

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Examples

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Embodiment Construction

[0046] Referring to FIGS. 1, 2 and 3, a prior art multi-grip blind rivet 30 includes a mandrel 32 formed with a stem 34 and a pulling head 36, and a rivet body 38 having an axial passage 40. An outer surface 42 of the rivet body 38 is formed, in a transaxial plane, with a plurality of indentations 44, each of which is concave, as viewed from the exterior of the rivet body, and generally hemispherical in shape. A plurality of ribs 46 are formed in the outer surface 42 of the rivet body 38, formed as a result of the indentations 44, with each rib separating adjacent indentations. An inward-most portion 48 of each indentation 44 is work hardened as represented by cross hatching in FIG. 1. A multi-grip blind rivet of this type is illustrated and described in U.S. Pat. No. 6,254,324.

[0047] Referring to FIGS. 4, 5 and 6, another prior art multi-grip blind rivet 50 includes a mandrel 52 formed with a stem 54 and a pulling head 56, and a rivet body 58 having an axial passage 60. An outer s...

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Abstract

A multi-grip blind rivet 74 includes a rivet body 82, adapted to receive a portion of a mandrel 76. A plurality of indentations 88 are formed in an outer surface 86 of the rivet body 82 in each of three axially spaced transaxial planes. Each indentation 88 is formed with a work hardened base surface 90 having a convex portion, which is formed with axially spaced first and second transaxial edges 106 and 108 having nonlinear portions. Adjacent indentations 88 are separated by ribs 89. A flared intermediate surface 122 extends between the base surface 90 and the outer surface 86. The rivet 74 is assembled within aligned holes 128 and 130 of workpieces 124 and 126, respectively, where, upon setting of the rivet, the indentations 88 collapse and the outer surface 86 bulges against walls of the holes to retain the workpieces together.

Description

[0001] This application is a continuation-in-part of applicant's co-pending application U.S. application Ser. No. 10 / 153,761, filed May 22, 2002, and titled MULTI-GRIP BLIND RIVET, which is pending. The disclosure of applicant's above-noted co-pending application is incorporated herein by reference thereto.BACKGROUND OF THE INVENTION [0002] This invention relates to a multi-grip blind rivet, and particularly relates to a multi-grip blind rivet having one or more radial indentations formed in one or more transaxial planes of a rivet body of the rivet. [0003] Typically, multi-grip blind rivets include a mandrel, or stem, formed with a head at one axial end thereof, and a rivet body, formed as a sleeve or shank having a passage therethrough and a flange at one axial end thereof. A mandrel-body assembly is formed by inserting a non-head end of the mandrel into the passage at a non-flange end of the rivet body and through the passage. With this assembly, the head of the mandrel is eventu...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F16B13/06F16B19/08F16B19/10
CPCF16B19/1054
InventorPIACENTI, FRANKROBERTSON, JERRY W.
OwnerNEWFREY