Handheld power tool having a restart protection device
AssigneeRobert Bosch GmbH
InventorsAttila Nagy, Attila Petrovics
Life of this patent
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Abstract
A mains-operated handheld machine tool includes a tool housing, an electric drive motor arranged in the housing and configured to drive an associated tool insert, and a slide switch arranged, at least in a longitudinally displaceable fashion, on the tool housing and coupled to a sliding element configured to switch the drive motor on and off. The mains-operated handheld machine also includes a protection device with an electromechanical relay. The protection device is configured to prevent, by way of the electromechanical relay, uncontrolled restarting of the drive motor after an interruption to a corresponding power supply to the drive motor as a result of latching of the relay being canceled.
Claims15
A mains-operated handheld machine tool, comprising:
- a tool housing;
- an electric drive motor arranged in the tool housing and configured to drive an associated tool insert;
- a slide switch coupled to a sliding element configured to switch the drive motor on and off, the slide switch being arranged, at least in longitudinally displaceable fashion, on the tool housing;
- and
- a protection device including an electromechanical relay, the protection device being configured to prevent, by way of the electromechanical relay, uncontrolled restarting of the drive motor after an interruption to a corresponding power supply to the drive motor as a result of latching of the relay being canceled,
- wherein the protection device has an electrical switch comprising a make contact and a break contact,
- wherein the make contact and the break contact are actuable by a lever that is accommodated tiltably on the plunger, and
- wherein the lever is guided circumferentially in a slotted-link slideway with an approximately quadrilateral outline, and the slotted-link slideway has at least one diagonally running slideway section.
A mains-operated handheld machine tool, comprising:
- a tool housing;
- an electric drive motor arranged in the tool housing and configured to drive an associated tool insert;
- a slide switch coupled to a sliding element configured to switch the drive motor on and off, the slide switch being arranged, at least in longitudinally displaceable fashion, on the tool housing;
- and
- a protection device including an electromechanical relay, the protection device being configured to prevent, by way of the electromechanical relay, uncontrolled restarting of the drive motor after an interruption to a corresponding power supply to the drive motor as a result of latching of the relay being canceled,
- wherein the sliding element is pretensioned by a compression spring supported on the tool housing, and
- wherein a contact slide is displaceable within the relay parallel to the sliding element with play by the sliding element so as to energize a coil of the relay by forced mechanical closing of a make contact of the relay.
A mains-operated handheld machine tool, comprising:
- a tool housing;
- an electric drive motor arranged in the tool housing and configured to drive an associated tool insert;
- a slide switch coupled to a sliding element configured to switch the drive motor on and off, the slide switch being arranged, at least in longitudinally displaceable fashion, on the tool housing;
- and
- a protection device including an electromechanical relay, the protection device being configured to prevent, by way of the electromechanical relay, uncontrolled restarting of the drive motor after an interruption to a corresponding power supply to the drive motor as a result of latching of the relay being canceled,
- wherein the sliding element is pretensioned by a compression spring supported on the tool housing, and
- wherein the relay has a coil and a plate-shaped armature which is magnetically attractable by the coil, and a make contact of the relay is actuable by the armature.
Dependencies are inferred from the claim text.