Electrically driven hand-held tool

US6543549B1 · kind B1 · utility

Assignee

• Hilti Aktiengesellschaft · LI

Inventors

• Reinhard Riedl · Finning, DE
• Manfred Ludwig · Stuttgart, DE

Key dates

• Filing date: May 5, 2000
• Grant date: Apr 8, 2003
• Expiry date: May 5, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S173/02
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

An electrically driven hand-held tool including a housing (2; 12; 22; 32), an electromotor (20; 30; 40), a gear set for transmitting rotation of an output shaft of the electromotor to a drive spindle, and a fan-wheel all arranged in the housing (2; 12; 22; 32), with the fan-wheel providing, during operation of the tool, for aspiration of air through the suction openings (6; 16; 26; 36) formed in the housing for directing the aspirated air past the electromotor and the gear set for cooling same, and for expelling warm air, which was heated as a result of absorbing heat generated by the electromotor and the gear set during the operation of the tool, out of the housing (2; 12; 22; 32), and a warm air channel (7; 17; 27; 37) arranged downstream of the electromotor and the gear set and spaced from a tool handle (3; 13; 23; 33) and having a plurality of blow-out openings (8; 18; 28; 38) arranged in such a way that during use of the hand-held tool, the expelled warm air flows in a direction away from the tool operator.