Power-driven screwdriver with removable depth stop

US6176162A · kind A · utility

Assignee

• C. & E. FEIN GMBH · DE

Inventors

• Manfred Ludwig · Stuttgart, DE
• Wolfgang Schreiber · Stuttgart, DE

Key dates

• Filing date: Sep 2, 1999
• Grant date: Jan 23, 2001
• Expiry date: Sep 2, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B25B23/141
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A screwdriver is disclosed, comprising a removable depth stop which selectably either, when equipped with the depth stop, allows noiseless shutoff or, with the depth stop removed, allows torque-dependent shutoff, without any chattering occurring when the machine continues to run. To this end, an adjustable torque-dependent release clutch is combined with an entrainment clutch of known type, which is additionally preceded by a disconnect clutch, a locking means being provided in order to hold a throwout ring, which forms one of the two elements of the disconnect clutch, in a predetermined position under load. In this way, noiseless operation is ensured after release, both when working with the depth stop and in the case of torque-dependent shutoff, with the depth stop removed.