Needle-Guiding Device for a Drilling Resistance Measurement Unit, Drilling Resistance Measurement Unit, and Drilling Resistance Measurement Method for Investigating the Nature of Wood

A method for investigating the nature of wood, the method comprising:

• providing a drilling resistance measurement unit with a needle-guiding device comprising:
• a needle holder comprising a drill chuck configured to receive the specified drilling needle;
• and a support device arranged in front of the needle holder and extending in a longitudinal direction of the specified drilling needle, the support device comprising at least one scissor-type extension arm device comprising a scissor-type extension arm comprised of stays;
• clamping a drilling needle in the needle holder;
• transferring the scissor-type extension arm into an extended state;
• placing the needle-guiding device with the drilling needle clamped in the needle holder against an object of wood to be examined;
• inserting the drilling needle into the object of wood and, in doing so,
• simultaneously transferring the scissor-type extension arm into the folded state.

A method for investigating the nature of wood, the method comprising:

• providing a drilling resistance measurement unit with a needle-guiding device comprising:
• a needle holder comprising a drill chuck configured to receive the specified drilling needle;
• and a support device extending in a longitudinal direction of the specified drilling needle, the support device embodied as a drive device comprising a first interacting force transmitting element and a second interacting force transmitting element arranged parallel adjacent to each other, wherein the needle holder is attached to the drive device and configured to be moved by the drive device;
• clamping a drilling needle in the needle holder;
• guiding the drilling needle in the support device;
• positioning the needle holder in a rear position at the drive device;
• placing the needle-guiding device with the clamped drilling needle against an object of wood to be examined;
• inserting the drilling needle into the object of wood and, in doing so, simultaneously transferring the needle holder into a forward position at the drive device.