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US 4,047,412 AGranted
Method of making a pipe fitting and product
AssigneeElkhart Products Corporation
InventorMarvin E. Holmgren
Life of this patent
Estimating the term…
Abstract
A method of making a pipe fitting havin three or more legs arranged in any desired shape by deforming a malleable metal tube substantially filled with a constant volume filler material in a single step without the need for secondary bending while maintaining the filler material at constant volume to provide a fitting wherein the variation in wall thickness is less than about 10%.
Claims5
A method for producing a pipe fitting having at least three legs comprising the steps of:
- providing a tube of malleable metal having one end closed and a diameter to wall thickness ratio in the range of 5-30,
- substantially filling said tube with a constant volume filler material,
- confining said tube in die means having relief zones on each side of said tube and intermediate the ends adapted to develop legs having a length to diameter ratio of more than 3, and
- deforming said tube in a single step by exerting pressure at both ends thereof to extrude the same from both ends simultaneously while continuously maintaining said filler material at constant volume to provide at least three legs thereby wherein the variation in wall thickness throughout said fitting is less than about 10%.
1 more element
Dependencies are inferred from the claim text.