Fastener arrangement for fastening a detachable panel
The invention relates to a fastener for attaching detachable panels to a support structure, in particular for use in aerospace applications. The fastener comprises a first tapered portion and a second tapered portion, each of the tapered portions having a thinner end and a thicker end, the first and second tapered portions being located axially adjacent each other such that the thicker end of the first tapered portion is located axially adjacent the thicker end of the second tapered portion, and wherein the angle of taper of the first portion is greater than the angle of taper of the second portion. An assembly is also described, comprising a fastener, a support structure and a detachable panel.
1 . A fastener comprising a first tapered portion and a second tapered portion, each of the tapered portions having a thinner end and a thicker end, the first and second tapered portions being located axially adjacent each other such that the thicker end of the first tapered portion is located axially adjacent the thicker end of the second tapered portion, and wherein the angle of taper of the first portion is greater than the angle of taper of the second portion.
2 . A fastener as claimed in claim 1 wherein the first tapered portion is of a non-jamming type, having an angle of taper greater than 5 degrees.
3 . A fastener as claimed in claim 1 wherein the second tapered portion is of a jamming type, having an angle of taper less than 5 degrees.
4 . A fastener as claimed in claim 1 wherein the fastener comprises two screw threaded portions, one screw threaded portion being located axially adjacent the thinner end of the first tapered portion, and the other screw threaded portion being located axially adjacent the thinner end of the second tapered portion.
5 . A fastener as claimed in claim 1 wherein the first tapered portion has an angle of taper in the range 15-40 degrees.
6 . An assembly comprising a fastener, a panel and a supporting structure to which the panel is detachably fastened by the fastener, the panel and supporting structure being formed with tapered holes which receive the fastener, the fastener comprising a first tapered portion for location in the panel, and a second tapered portion for location in the supporting structure, each of the tapered portions having a thinner end and a thicker end, the first and second tapered portions of the fastener being located axially adjacent each other such that the thicker end of the first tapered portion is located axially adjacent the thicker end of the second tapered portion, and wherein the angle of taper of the first portion and its corresponding hole in the panel is greater than the angle of taper of the second portion and its corresponding hole in the supporting structure.
7 . An assembly as claimed in claim 6 wherein the first tapered portion is of a nonjamming type, having an angle of taper greater than 5 degrees.
8 . An assembly as claimed in claim 6 wherein the second tapered portion is of a jamming type, having an angle of taper less than 5 degrees.
9 . An assembly as claimed in claim 6 wherein the fastener comprises two screw threaded portions, one screw threaded portion being located axially adjacent the thinner end of the first tapered portion, and the other screw threaded portion being located axially adjacent the thinner end of the second tapered portion.
10 . An assembly as claimed in claim 6 wherein the first tapered portion has an angle of taper in the range 15-40 degrees.