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US 8,024,867 B2Granted
Tape measure calibrator
AssigneeDouglas J. Christiansen
InventorDouglas J. Christiansen
Life of this patent
Estimating the term…
Abstract
A tape measure calibrator includes a base with a first reference surface and a second reference surface. A pull calibration mark is made on the base which indicates a first distance from the first reference surface. A push calibration mark is also made on the base which indicates a second distance from the second reference surface, in which the first distance and the second distance are substantially equal.
Claims13
An apparatus for calibrating a tape measure comprising:
- a base,
- a slot formed in the base, the slot having a first reference surface and a second reference surface and being configured to receive a hook of a tape measure;
- the hook being pulled against the first reference surface during a pull measurement and the hook being pressed against the second reference surface during a push measurement;
- a pull calibration mark, the pull calibration mark indicating a first distance from the first reference surface, a corresponding mark on the tape measure being compared to the pull reference mark to determine a pull measurement error;
- and
- a push calibration mark, the push calibration mark indicating a second distance from the second reference surface, the corresponding mark on the tape measure being compared to the push calibration mark to determine a push measurement error;
- in which the first distance and the second distance are substantially equal.
4 more elements
A method for calibrating a tape measure comprising:
- placing a hook in a slot, the hook being slidably attached to a flexible tape of the tape measure, the slot comprising a first reference surface and a second reference surface;
- pulling the flexible tape to bring the hook into contact with the first reference surface, thereby sliding the end hook to full extension with respect to the flexible tape;
- comparing a linear graduation on the flexible tape to a pull calibration mark to obtain a pull measurement error;
- pushing the flexible tape to bring the hook into contact with the push reference surface, thereby sliding the end hook to full retraction with respect to the flexible tape;
- and
- comparing a linear graduation on the flexible tape to a push calibration mark to obtain a push measurement error.
3 more elements
Dependencies are inferred from the claim text.