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Drilling guide and measuring instrumentation

  • US 5,895,389 A
  • Filed: 05/29/1997
  • Issued: 04/20/1999
  • Est. Priority Date: 05/29/1997
  • Status: Expired due to Fees
First Claim
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1. A measuring device for measuring penetration depth of a drilling tool being held in a chuck, the device comprising:

  • a workpiece-abutment member having a workpiece-abutment end adapted for abutting a workpiece and having a first aperture configured for receiving a protruding portion of the tool that protrudes from the chuck, the protruding portion having a preselected protruding length;

    a chuck-abutment member being collapsibly associated with said workpiece-abutment member and having a chuck-abutting end adapted for abutting the chuck and having a second aperture adapted to axially receive the protruding portion of the tool, said abutment members having a variable combined length that is adjustable up to substantially the protruding length; and

    a frictional member associated with one of said abutment members and biased against another of said abutment members for increasing friction therebetween sufficiently for maintaining the abutment members in a selected collapsed position during withdrawal of the protruding portion of the tool from the abutment members;

    wherein the penetration depth is determinable by a change in the combined length as the tool is drilled into the workpiece axially through the device and as the chuck collapses said abutment members to the collapsed position.

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