Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1994-10-25
1996-02-27
Smith, Scott A.
Tool driving or impacting
Drive controlled by relative axial movement of tool
173 48, E21C 332, B23B 4516
Patent
active
054941156
ABSTRACT:
This invention relates to and electric hammer drill and in particular to one including a housing, a motor disposed in the housing, a trigger mounted in the housing and connected between the motor and a power source, a gearing coupled to an axle of the motor, a shift rod having a vertical flat surface and a cylindrical surface so that the vertical flat surface will be spaced from an end of a spindle when the shift rod is at an predetermined position and the cylindrical surface will be in contact with the end of the spindle when the shift rod is rotated through an angle of 180 degrees, a chuck fixedly connected to the other end of the spindle, an inner serrated collar rigidly mounted in the housing, an outer serrated collar connected with the spindle and disposed against the inner serrated collar with teeth being opposite each other, and a spring for keeping the two serrated collars apart at normal condition.
REFERENCES:
patent: 3693728 (1972-09-01), Stroezel
patent: 3777825 (1973-12-01), Gullich
patent: 3799275 (1974-03-01), Plattenhardt et al.
patent: 4418766 (1983-12-01), Grossman
patent: 5343961 (1994-09-01), Ichikawa
patent: 5375665 (1994-12-01), Fanchang et al.
Lei Alfred
Smith Scott A.
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