US 2012/0235520 A1Published application

Hand tool

AssigneeHilti Aktiengesellschaft

InventorHelmut BURGER

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Abstract

A hand tool is disclosed. A polarity reversing switch has first contact devices which are immovable with respect to a machine housing and second contact devices on a brush holder. An operating element is adjustable between two positions for changing a direction of travel of an electric motor. At least one of the first contact devices has a first metal strip and a first spring. A section of the first metal strip has a first contact face for contacting one of the second contact devices. The first spring is prestressed in the direction toward the second contact device. At least one of the second contact devices has a second metal strip and a second spring. A section of the second metal strip has a second contact face for contacting one of the first contact devices. The second spring is prestressed in the direction of the first contact device.

Claims10

Dependent claims

A hand tool, comprising:

a machine housing;
an electric motor including a brush holder that is pivotable about a motor axis and a polarity reversing switch that includes first contact devices which are immovable with respect to the machine housing and second contact devices which are disposed on the brush holder;
and
an operating element coupled to the brush holder;
wherein at least one of the first contact devices has a first metal strip and a first spring, wherein a first section of the first metal strip has a first contact face that is contactable with at least one of the second contact devices, and
wherein the first spring is prestressed against the first section of the first metal strip in a direction toward the second contact devices;
and/or wherein at least one of the second contact devices has a second metal strip and a second spring, wherein a first section of the second metal strip has a second contact face that is contactable with at least one of the first contact devices, and wherein the second spring is prestressed against the first section of the second metal strip in a direction toward the first contact devices.

4 more elements

Dependencies are inferred from the claim text.