Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1975-05-13
1976-12-21
Purser, Ernest R.
Tool driving or impacting
Drive controlled by relative axial movement of tool
173 48, 173109, E21C 112
Patent
active
039982785
ABSTRACT:
A hammer drill has a housing, a tool shaft rotatably and axially displaceably supported in the housing, a motor, a gearing connecting the motor with the tool shaft and a striking mechanism for imparting successive impacts to the tool shaft. The striking mechanism includes an axially movable striking element. The hammer drill further has a clutch component mounted on the tool shaft and having an engaged state in which it is operatively connected to the striking element and a disengaged state in which it is disconnected from the striking element, and a drive element connecting the motor with the clutch component to rotate the latter. The drive element and the clutch component are arranged axially slidably relative to one another. The striking mechanism further has an intermediate member supported next to and in axial alignment with the clutch component. The intermediate member has coupling elements operatively connected to the clutch component in the engaged state of the clutch component in which the striking mechanism is in an operating state. The coupling elements are disconnected from the clutch component in the disengaged state of the clutch component in which the striking mechanism is in a non-operating state. The intermediate member at least partially surrounds the striking element for guiding the same in its axial motion. The tool shaft has an inner terminus which is positioned externally of the outline of the striking mechanism.
REFERENCES:
patent: 3685594 (1972-08-01), Koehler
Hoyer Rudolf
Stiltz Erwin
LICENTIA Patent-Verwaltungs-G.m.b.H.
Purser Ernest R.
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