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US 5,702,212 AGranted
Drilling device for producing drilled holes with an undercut
OwnerHerbert Erath, Armin Blaeseinventors
Life of this patent
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Abstract
In a drilling device for producing drilled holes with an undercut, in particular in facing panels of stone, ceramics, concrete or similar materials a drive motor of a drilling shaft is mounted so as to swivel, is displaced outward by a sloping surface, and is driven by a lead screw gear unit to perform a precession movement.
Claims7
A drilling device for producing drilled holes with an undercut, comprising feed means for providing a feed movement of the device;
- drive means for driving a drilling tool;
- an outward displacement means for outwardly displacing the drilling tool, said outward displacement means for laterally outwardly displacing the drilling tool and including a swivel unit and a lead screw gear unit having a coarse thread pitch and including a lead screw and a lead screw nut which form two screw elements, said swivel unit having a flexing-resistant connection to a chuck for the drilling tool and being mounted so as to swivel about a pivot point, one of said screw elements of said lead screw gear unit being displaceable in direction of a longitudinal center line and upon a forward feed displacement said swivel unit being swiveled from its central position by said outward displacement means, so that said one of said screw elements is caused to rotate by the displacement of the other of said screw elements and is joined to said swivel unit so that they rotate together, and the displacement after the full outward displacement has been reached amounts to at least one thread pitch.
Dependencies are inferred from the claim text.