Hilti Aktiengesellschaft

Ralf Greitmann

Markus Hartmann

Oliver Ohlendorf

Ralf Meixner

Franz Moessnang

Manfred Ludwig

Christian Sattler

Roland Meuer

Georg Holzmeier

Dragomir Ljubojevic

Guenther Veik

Helmut Specht

Josef Starkmann

Michael Heger

Thorsten Assel

Christoph Wetter

Thomas Reichenberger

Franz Mößnang

A power tool having an air cooling system. A special air guidance system is proposed, the components of the power tool, such as a motor, transmission or electronics of the power tool, can be supplied in a particularly efficient manner with a cooling air flow around them and in this way can be cooled. In this case, the cooling system should, in particular, be independent of any components of the housing of the power tool since the air guidance is advantageously brought about by internal guidance processes, wherein these internal guidance processes preferably take place independently of components of the housing of the power tool. In particular, the housing-independent air cooling of the components of the power tool is achieved by the provision of a fan on a rotor of the motor of the power tool, which is designed, by means of a reduced pressure, to produce a cooling air flow and guide it in a suitable manner through the power tool. In a second aspect, the invention relates to a method for cooling components of a power tool.

Power tool having an air cooling system andmethod for cooling components of a power tool

A power tool having a first rechargeable battery and a second rechargeable battery as energy sources, wherein the power tool includes a main body and a motor. In particular, the power tool is characterized in that the main body has a first receiving space for receiving the first rechargeable battery, and a second receiving space for receiving the second rechargeable battery, wherein the receiving spaces are arranged in such a way within a housing of the main body that the rechargeable batteries are accessible and replaceable from a rear side of the main body, wherein the receiving spaces for the rechargeable batteries form a lower boundary of the main body of the power tool. The receiving spaces for the rechargeable batteries or the rechargeable batteries themselves are arranged in a lower, rear region of the main body, where they are particularly well protected against falling, moisture or the like.

Power tool having a first and a second rechargeable battery

A handheld, hand-guided cutting-off machine (), which includes a rotating cutting-off wheel, a supporting housing part (), an output shaft, which is rotatably supported around an output axis (), a drive motor, a transmission mechanism (), which connects the drive motor to the output shaft, a flange and a safety guard (), which covers the cutting-off wheel over a covering area. The cutting-off wheel is rotatably fixedly mounted on the output shaft with the aid of the flange and surrounded by the safety guard (), which is pivotable around a pivot axis. The safety guard (), the supporting housing part () and the transmission mechanism () have maximum distances from the output axis () over an outcut angle (&#x3b8;), which are less than or equal to half the flange diameter of the flange.

Handheld, hand-guided cutting-off machine

A handheld power tool has a switchable gear component actuatable by a selector switch. The gear component moves from a first operating position into a second operating position. The selector switch has a first switching position associated with the first operating position and a second switching position associated with the second operating position, and movable so that intermediate positions are assumed. A traveling coupling between the selector switch and the gear component has a spring exerting force onto the gear component in the first direction. A locking bolt is coupled to the selector switch in a positively driven manner. In the intermediate positions, the locking bolt is moved into a blocking bolt position blocking movement of the gear component out of the first operating position into the second operating position. When the selector switch is in the second switching position, the locking bolt is in a releasing bolt position.

Handheld power tool

A device for switching operating modes for an at least partially rotational and percussive hand tool machine having an overload clutch, which is arranged between a hollow driving guide cylinder () containing an axially striking impact piston () and a rotating, driving crown gear () on the guide cylinder () and which can be switched into different operating modes using an externally manually switchable, axially displaceable switching member, wherein at least one operating mode is rotationally driven, wherein the axially displaceable switching member engages rotationally form-lockingly into a freely rotational coupling ring () of the overload clutch mounted relative to the guide cylinder ().

Device for switching operating mode for hand tool

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Kaufering, Germany

Ralf Greitmann