Switch with speed control

US4660019A · kind A · utility

Assignee

• Preh, Elektrofeinmechanische Werke Jakob Preh, Nachf. GmbH & Co. · DE

Inventors

• Karl-Heinz Bauer · Graben-Neudorf, DE
• Franz Rutterschmidt · Heustreu, DE
• Gerhard Spiller · Bad Königshofen im Grabfeld, DE

Key dates

• Filing date: Nov 15, 1984
• Grant date: Apr 21, 1987
• Expiry date: Nov 15, 2004

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H9/061
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

In a switch, for example, for a device such as a drill, a key switches an ectrical switching bridge at the beginning of the key displacement. A variable resistor is adjusted depending on the travel of the key, thereby controlling device speed. In order to achieve an adjustment of the key end stop, a slide displaceable in the transverse direction is mounted on the key, which slide has a stop edge projecting in the longitudinal direction. A stop border is provided on the switch cover and configured relative to the travel of the slide so that the distance between the stop edge and the stop border varies according to the displaced position of the slide, thereby enabling operator control of the device speed.