Electric switch with a drive shaft and a blocking mechanism for blocking actuation of the drive shaft

US6838626B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Erhard Deylitz · Berlin, DE
• Stefan Losch · Berlin, DE

Key dates

• Filing date: Mar 26, 2002
• Grant date: Jan 4, 2005
• Expiry date: Mar 26, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02B11/127
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An electric switch includes a drive shaft that can be actuated by means of a hand crank and a blocking mechanism for blocking actuation of the drive shaft. The hand crank has a shaft that can be displaced along the drive shaft and that is protected against removal by the drive shaft and a crank arm that is axially fixed on the shaft and is wound by the shaft. In order to configure that blocking mechanism in such a way that a blocking force substantially smaller in comparison with the torque of the drive shaft is needed in order to block actuation of the drive shaft, a recess is provided on the front side of the switch, into which the crank arm can be lowered in an anti-rotational manner by displacing the shaft, wherein the blocking mechanism that has been activated for blocking fixes the shaft axially once the crank arm has been lowered into the recess.