Patent · US Active

Hand-held power tool with air spring percussion mechanism, linear motor, and control process

US7926584B2 · kind B2 · utility

30Cited by

5References

23Claims

0Family size

Assignee

Hilti Aktiengesellschaft · LI

Inventors

Alexander John · Berlin, DE
Bernhard Sander · Munich, DE
Albert Binder · Buchs, CH

Key dates

Filing date	Aug 26, 2008
Grant date	Apr 19, 2011
Priority date	—
Expiry date	Mar 7, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH02K7/145
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A hand-held power tool (1) includes a linear motor (2) having a rotor (3) which is movable along a percussion axis (A) in an axially limited manner between two reversal points (W) and which can be driven by the striking piston (5) of the power tool with the intermediary of an air spring (4), sensors designed for determining the actual state of the rotor (3) and connected to a computer (9) connected via power electronics (33) to at least one field coil (10) of the linear motor (2), with the rotor (3) being displaced against a contact element (11a, 11b) at least at one reversal point (W) and being pressed against the contact element electromagnetically; and a control process for the hand-held power tool.

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