Rotary hammer
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United States of America Patent
Stats
-
Jan 23, 1990
Grant Date -
N/A
app pub date -
Feb 28, 1989
filing date -
Mar 4, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rotary hammer has a pneumatic hammer mechanism which can be driven by means of a driver-part mounted rotatably on an intermediate shaft, with which driver-part a first coupling element of a coupling is non-rotatably connected, while the second coupling element of the coupling is non-rotatably mounted on the intermediate shaft and through axial displacement can be brought into positive coupling engagement with the first coupling element. A synchronizing arrangement is provided, which on approach of the coupling elements to one another, accelerates the first coupling element at least approximately to the rotational speed of the second coupling element and only then permits the positive engagement of the coupling elements.
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