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:
Feb. 13, 1979
Filed:
Jul. 25, 1977
Virgil V Stanciu, Rocky River, OH (US);
Tempcraft Tool & Mold, Inc., Cleveland, OH (US);
Abstract
A method is presented to make an investment casting pattern of a rotatable turbine wheel or a stationary turbine nozzle wheel having one continuous and regular series of blades extending around its periphery with a uniform pitch between blades and in which all such blades are bent in one circumferential direction and adjacent blades overlap each other in a circumferential direction so that the wheel pattern cannot be made in a simple two part mold separating at right angles to a parting line. The method comprises separately forming two wheel pattern portions of the same diameter as the finished turbine wheel pattern, each having a series of continuous and regular blades around its periphery with a uniform pitch between the blades which is exactly twice the pitch of the blades in the finished wheel pattern. In such a pattern wheel portion the adjacent blades do not overlap each other. Two such pattern wheel portions are then assembled so that the blades of the two portions form the one continuous and regular series of blades which comprises the pattern of the complete turbine wheel.