Operating procedure and cooling system mechanism for the motor of an electric powered tool

US6911793B2 · kind B2 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Frank Fritsch · Kaufering, DE
• Hermann Schuster · Geltendorf, DE

Key dates

• Filing date: Dec 16, 2003
• Grant date: Jun 28, 2005
• Expiry date: Dec 16, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S388/937
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

An operating procedure for the motor (1) of an electric powered tool. The operating idle speed of the motor (1) is set to a value using regulator electronics (4), and the operating speed is the same as a chosen operating speed (n1). The motor (1) runs on a pre-determined and higher idle speed (n2) for cooling purposes after a specific idle time (ΔT). while the motor (1) runs on the pre-determined operating idle speed (n1). The engine speed is immediately set to the operating speed (n1) once again, when the motor requires a moment of strain at a certain period of time (T3) to maintain simple and comfortable operating procedures.