Hammer drill
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United States of America Patent
Stats
-
Feb 4, 1986
Grant Date -
N/A
app pub date -
Dec 12, 1983
filing date -
Feb 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a drill hammer a motor driven striking mechanism is provided with two air cushions of changeable volumes, through which impact energy is transmitted from the motor to a reciprocating striker which in turn transmits the energy to a tool of the drill hammer. When the striker moves in the direction towards the tool both air cushions act on the striker whereas when the striker moves away from the tool only one of two air cushions acts on the striker.
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