Hand tool

Details Hand tool Hand tool

1997-06-26

1999-07-06

Gerrity, Stephen F.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

81429, 173 15, 173170, 173217, 408202, B25B 2300

Patent

active

059186852

ABSTRACT:
A hand tool (1) having a drive motor (12), a depth stop (16) by which the drive motor (12) can be automatically switched off when it is in contact with a workpiece (4), and a switching mechanism (21) in an electric circuit (22). The electric circuit (22) includes a switch (24) for switching the drive motor (12) on and off, a first contact element (25) for reversing the polarity of the drive motor (12) and a second contact element (26) for switching off the drive motor (12) by the use of the depth stop (16). Also, a switching device (32) is connected to the drive motor (12) and is integrated into the electric circuit (22) so that the switching device (32) is arranged in a branch line (31) bypassing the second contact element (26) and by which the second contact element (26) can be bypassed in an open operating position caused by the depth stop (16) by actuation of the first contact element (25) for reversal of the direction of rotation of the drive motor (12), which makes it possible to switch the drive motor (12) from clockwise to counter-clockwise rotation or the reverse without the necessity of mechanical elements and without the necessity of any manual manipulation of adjustment elements.

REFERENCES:
patent: 2796161 (1957-06-01), Graybill
patent: 5094133 (1992-03-01), Schreiber

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