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Drilling Machine, In Particular Hand-Held Core Drilling Machine

  • US 20120275874A1
  • Filed: 04/27/2012
  • Published: 11/01/2012
  • Est. Priority Date: 04/28/2011
  • Status: Active Grant
First Claim
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1. A drilling machine, comprising:

  • a tool spindle for driving a tool;

    a drive including a motor for driving said tool spindle, said drive including at least a first transmission stage and a second transmission stage;

    a center mount provided on said tool spindle for mounting a pilot drill;

    a tool mount provided on said tool spindle for mounting a drill bit, wherein said center mount and said tool mount are arranged substantially concentrically with one another; and

    a switching device interacting with said drive, said center mount and said tool mount;

    wherein said switching device is configured for operating said drive selectively at least in a center drilling configuration or in a core drilling configuration, wherein, when being in said center drilling configuration, at least said pilot drill can be driven in said first transmission stage, and wherein, when being in said core drilling configuration, at least said drill bit can be driven in said second transmission stage;

    whereby said pilot drill can be driven at a first rotational speed range, and said drill bit can be driven at a second rotational speed range different from said first rotational speed range.

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