Hand held power tool with safety coupling
AssigneeRobert Bosch GmbH
InventorHans Bloechle
Life of this patent
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Abstract
A hand held power tool, particularly a hammer drill has a housing, a drive shaft, a rotatable tool holder, a safety coupling provided between the drive shaft and the tool holder, and a switching member supported with a bearing axis extending substantially parallel to the drive shaft and freely movable about the bearing axis in a plane extending substantially perpendicularly to the drive shaft. The switching member during a rearward rotation of the housing about an axis of the tool holder engages in the safety coupling and releasing the safety coupling.
Claims15
A hand held power tool, particularly a hammer drill, comprising a housing;
- a drive shaft;
- a rotatable tool holder;
- a safety coupling provided between said drive shaft and said tool holder;
- and a switching member supported with a bearing axis extending substantially parallel to said driven shaft and freely movable about said bearing axis in a plane extending substantially perpendicularly to said drive shaft, said switching member being formed so that in response to a jerky rotation of said housing about an axis of said tool holder said switching member engages said safety coupling and releases said safety coupling from said drive shaft.
A hand held power tool as defined in claim 70, wherein said holding member applies an arresting moment to said switching member.
A hand held power tool, particularly a hammer drill, comprising a housing;
- a drive shaft;
- a rotatable tool holder;
- a safety coupling provided between said drive shaft and said tool holder;
- a switching member supported with a bearing axis extending substantially parallel to said drive shaft and freely movable about said bearing axis in a plane extending substantially perpendicularly to said drive shaft, said switching member being formed so that in response to a jerky rotation of said housing about an axis of said tool holder said switching member engages said safety coupling and releases said safety coupling from said drive shaft;
- a spindle through which said tool holder is driven in rotation, said safety coupling has a coupling half;
- and a ring which is rotatable relative to said spindle and connected with said coupling half, said switching member acting on said ring, said ring being connected with said spindle through a thread.
Dependencies are inferred from the claim text.