Tape measure device

Details Tape measure device Tape measure device

1993-06-24

1995-04-18

Wirthlin, Alvin

Geometrical instruments

Distance measuring

Scale reading position sensor

33763, 33769, 33770, 33771, 33512, 335554, G01B 310, G01B 702

Patent

active

054067154

ABSTRACT:
A tape measure device includes a belt tape member made of a flexible material. A cursor is slidably supported for movement on and along the belt tape member. The cursor includes a housing and an encoder which includes a relative displacement sensor for detecting a relative displacement value between the belt tape member and the cursor. The displacement sensor includes a first electrode made of a conductive ink and printed at predetermined and spaced intervals on and along the belt tape member. The conductive ink first electrode printed on the belt tape member is protectively coated by an electrically nonconductive insulative membrane. A second electrode is provided on the cursor and opposes the first electrode and the insulation membrane. A circuit is provided for creating an electrical capacitance value between the first and second electrodes and for issuing signals in response to a change of electrical capacitance between the first and second electrodes. A display responsive to the signals is provided for indicating the detected relative displacement value between the belt tape member and the cursor thereon.

REFERENCES:
patent: 4449179 (1984-05-01), Meyer
patent: 4473949 (1984-10-01), Schechtman
patent: 4483077 (1984-11-01), Matsumoto et al.
patent: 4586260 (1986-05-01), Baxter et al.
patent: 4611402 (1986-09-01), Yamamoto et al.
patent: 4635367 (1987-01-01), Vigede
patent: 4743902 (1988-05-01), Andermo
patent: 4873770 (1981-10-01), Luttmer et al.
patent: 5027526 (1991-06-01), Crane

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