Importance

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Abstract

A hand-held power tool comprises a drive unit including a first housing, a combustion motor located in and fixed to said first housing and having an output shaft; and a work unit including a rotatable tool, an input shaft, a transmission between the input shaft and the tool for driving the latter and a second housing. A quick-connection arrangement is provided for releasably connecting the first to the second housing and a coupling arrangement coaxial with the connection arrangement serves to couple the output shaft with the input shaft. The quick-connecting arrangement comprises a centralizing ring coaxial with the output shaft and fixed to a stationary part of the combustion motor, a coupling ring turnably mounted on the centralizing ring, an annular coupling member fixed to the second housing, the coupling ring and the coupling member having cooperating cams having inclined faces, a spring connected to the coupling ring for turning the latter in a direction in which these inclined faces are tightly engaged to couple the coupling ring with the coupling member and therewith the first housing to the second housing, and a lever projecting radially from the coupling ring and being movable from an arresting position holding the coupling ring in a stationary position to a releasing position permitting turning of the coupling ring under the action of the spring.

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First Claim