The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1989
Filed:
Aug. 04, 1987
Engbert T Bannink, Jr, King County, WA (US);
The Boeing Corporation, Seattle, WA (US);
Abstract
A method of forming a bushing in a graphite/epoxy structure in order to repair holes that are either too large or out-of-round. A mandrel having a diameter that is smaller than the desired hole diameter is wrapped with a strip of epoxy-impregnated graphite mat until the mandrel and mat tightly fit into the hole in the graphite/epoxy structure. The mandrel is then heated causing the mandrel to both expand and cure the epoxy resin in the mat. Expansion of the mandrel forces the mat against the edge of the hole to promote bonding between the mat and the graphite/epoxy structure. After the mat has cured, the mandrel is cooled thereby causing it to contract away from the mat so that it can be easily removed. Finally, the mat is trimmed to the thickness of the graphite/epoxy structure and a hole having the desired diameter is then machined in the mat.