US 4,817,264 AGranted

Fastener and assembly process

AssigneeShur-Lok Corporation

InventorAlbert L. Worthing

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Abstract

The method of affixing a fastener to a panel, said fastener comprising a body portion and a flange portion, said body portion comprising a thermoplastic material and being of a length greater than the thickness of said panel, comprising the steps of: inserting said fastener into and through said panel opening, whereby an end of said body portion of said fastener extends beyond the plane of the surface of the opposed side surface of said panel; and applying ultrasonic energy to said end of said fastener body portion for reshaping said end into a flange, said ultrasonic energy causing said end to flare over and contact said adjacent panel surface thereby sealing the panel against moisture entering the core space via the fastener installation hole. In a fastener of the type for mounting to a sandwich type panel and adapted to receive a bolt to attach external objects to said; said fastener having a body portion extending within said panel and having a flange portion external of said panel, the improvement comprising: said fastener body portion comprises a thermoplastic material and wherein said flange portion comprises a metal material and wherein the fastener contains a predetermined volume, V1, and is of a given weight, W1, and wherein the factor D1, defined as the weight, W1, divided by the volume, V1, is equal to or less than the density characteristic of the metal titanium.

In combination with a sandwich panel of the type containing first and second parallel spaced face surfaces, and a core structure intermediate said top and bottom surfaces forming a sandwich construction of a predetermined thickness, and said panel further containing at least one hole there through for receiving a fastener, the fastener comprising:

a generally cylindrical body portion, said body portion having a height greater than the thickness of said panel and containing an axial passage for permitting extension of a bolt shank there into,
said body portion further comprising a thermoplastic material, said thermoplastic material having the characteristic of softening responsive to the application of ultrasonic energy thereto,
said body portion further including, and integrally formed flange portion extending about the upper end peripheral of said axial passage for bonding attachment to a first face of said panel in the region extending about the inert hole in said panel,
flange means, said flange means being of a different material than said body portion and containing a washer shaped base of a predetermined diameter having a central opening and containing an upwardly extending tubular portion, said upwardly extending tubular portion being coaxial of said passage in said body portion and coaxial of and located within said axial passage and attached to said walls defining said body portion axial passage, said tubular portion of said flange means being of a predetermined length, which length is less than the thickness of said panel and less than the length of said body portion,
said flange means consisting of a metal material having a density greater than the density of the metal aluminum, said body portion and said flange means together defining a predetermined volume and predetermined weight and density factor defined as said predetermined weight divided by said predetermined volume, and wherein said density factor is lesser than or equal to the density factor of the metal titanium.

2 more elements

Facts

Application

07/083,066Filed 10 Aug 1987

Granted

4 Apr 1989

Term ends

Not estimatedThe source records don’t support an estimate.

Classification23 codes

B29C 65/08
By heating, with or without pressure: using ultrasonic vibrations
B29C 65/568
Using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second…
B29C 65/607
The rivets being integral with one of the parts to be joined, i.e. staking: the integral rivets being hollow
B29C 66/112
Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint…: single…

Abstract

Claims11