Geometrical instruments – Distance measuring – By flexible tape
Patent
1993-04-23
1995-02-07
Will, Thomas B.
Geometrical instruments
Distance measuring
By flexible tape
33767, 33769, 2423969, 2423941, 2425642, G01B 310
Patent
active
053866436
ABSTRACT:
This invention discloses a digital display tape measure having an accuracy of about 0.01 mm. The digital display tape measure includes a metal tape having a series of uniformly sized and spaced holes positioned along a common center line of the tape. As the tape is extracted and retracted from the tape measure housing, the holes engage pins positioned on a sprocket such that the sprocket will rotate causing an optical encoder to rotate along the same axis. The optical encoder produces optical pulses to provide the desired accuracy. The tape measure further includes a braking mechanism, an indexing mechanism and a drive motor. The braking mechanism prevents the reel on which the tape is wound from rotating in its normal mode. A braking arm and motor switch are configured relative to each other such that the braking arm has to deactivate the braking mechanism prior to the motor switch activating the drive motor. The indexing arm enables the reel to be incremented when the braking mechanism is activated.
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