Deformation detection tool and method for detecting deformation

Patent metadata

Field	Value
Publication number	US-9816806-B2
Application number	US-201414765444-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 4, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A tool for detecting deformation of a nominally straight element includes a first body element having first straight edge, means for biasing the first straight edge against the straight element, and a light source arranged to illuminate any space present between the straight element and the first straight edge of the first body element.

First claim

The invention claimed is:

1. A method of detecting deformation of a nominally straight element, the method comprising:
biasing a first body element having a first straight edge with the first straight edge against the nominally straight element;
illuminating the first straight edge from a first side of the first body element by a light source located on the first side of the body element; and
viewing the first straight edge from a second side of the first body element to detect the passage of any light from the light source between the nominally straight element and the first straight edge of the first body element;
wherein the nominally straight element comprises the interior surface of a hollow joint pin and the step of biasing the first straight edge against the nominally straight element comprises locating the first body element within the hollow pin.

2. The method of claim 1 , wherein:
the first body element is slidably connected to a second body element;
a spring is operatively associated with the first body element and the second body element to bias the first straight edge away from the second body element; and
the step of biasing the first straight edge against the nominally straight element comprises locating the first body element within the hollow pin and allowing the spring to bias the first straight edge away from the second body element.

3. The method of claim 2 , wherein the second body element comprises a second straight edge parallel to the first straight edge of the first body element, and the method further comprises viewing the second straight edge to detect the passage of any light from the light source between the nominally straight element and the second straight edge.

4. An aircraft landing gear assembly and tool kit comprising:
an aircraft landing gear assembly including at least two elongate members pivotally connected about a hollow joint pin; and
a tool located within the joint pin, the tool comprising:
a first body element having a first straight edge;
a second body element connected to the first body element and arranged to move relative to the first body element;
means for biasing the first straight edge away from the second body element and against a nominally straight element within the pin joint; and
a light source arranged on a first side of the first body element to illuminate any space present between the nominally straight element and the first straight edge of the first body elemen

Assignees

• Safran Landing Systems Uk Ltd

Inventors

• Green Chris
• Green Kay

Classifications

• G01B11/303

  using photoelectric detection means · CPC title

• G01B11/16 Primary

  for measuring the deformation in a solid, e.g. optical strain gauge · CPC title

• B64D2045/008

  Devices for detecting or indicating hard landing · CPC title

• G01B11/306

  for measuring evenness · CPC title

• G01B11/27

  for testing the alignment of axes {(means for centering or aligning a light guide within a ferrule G02B6/3834)} · CPC title