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:
Mar. 29, 2022
Filed:
May. 26, 2017
Ntn Corporation, Osaka, JP;
NTN CORPORATION, Osaka, JP;
Abstract
Provided is a heat treatment apparatus (), including: a conveying device (), which is configured to convey a rod-shaped workpiece (W) at a predetermined velocity along an axial direction of the workpiece (W); and a heating device () including a heating coil () configured to inductively heat the workpiece (W) being conveyed to a quenching temperature, wherein the heating coil () includes a first heating section (A) and a second heating section (B), which are coupled to each other in series along the axial direction of the workpiece (W), and is electrically connected to a single high-frequency power supply (), and wherein a coil pitch (D) of the second heating section (B) arranged relatively on a front side in a conveying direction for the workpiece (W) is larger than a coil pitch (D) of the first heating section (A) arranged relatively on a rear side in the conveying direction.