Patent · US Expired

Safety clutch for electrical hand-held tool

US6644450B2 · kind B2 · utility

10Cited by

9References

14Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Ferdinand Kristen · Germering, DE
Hans-Werner Bongers-Ambrosius · Munich, DE
Peter Hellmann · Obermeitingen, DE

Key dates

Filing date	Nov 30, 2001
Grant date	Nov 11, 2003
Priority date	—
Expiry date	Nov 30, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16D2123/00
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A safety clutch for an electric hand-held tool and including a rotor (8), an anchor disc (9) frictionally engageable with the rotor (8) for transmitting a torque there-between, a stationary axial stop (13) for limiting the air gap (s) between the rotor and the anchor disc and engageable by the anchor disc under an axial reserved pre-stress applied to the anchor disc (g); and a stationary electromagnetic coil (11) provided on a side of the rotor (8) remote from the anchor disc (9) and coaxial with the rotor (8) for generating a rotationally symmetrical magnetic flux (&phgr;) for attracting of the anchor disc (g) to magnetic poles (12a, 12b) associated with the rotor (8).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.