Hand held power tool with safety coupling
First Claim
Patent Images
1. 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.
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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.
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Citations
15 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11)
- a drive shaft;
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9. A hand held power tool as defined in claim 70, wherein said holding member applies an arresting moment to said switching member.
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12. 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. - View Dependent Claims (13, 14, 15)
- a drive shaft;
Specification