Measuring apparatus for determining a circumferential length of

Details Measuring apparatus for determining a circumferential length of Measuring apparatus for determining a circumferential length of

1988-10-05

1990-05-01

Shoap, Allan N.

Geometrical instruments

Gauge

Circular size

335551, 335612, G01B 310

Patent

active

049206591

ABSTRACT:
A measuring apparatus for determining a circumferential length of a body comprises an elongate, non-extensible tape measure having a first and a second terminal. A measuring scale is applied to the tape measure. A first and a second sliding part are provided for axially guiding the tape measure. Both sliding parts are provided with an actuating unit allowing to either axially lock the tape measure or to make it axially displaceable in the sliding part. Further, both sliding parts are provided with index marks to allow reading a measuring value with respect to the measuring scale. An elastic band is arranged between the two sliding parts. The tape measure is fixedly attached with one of its terminals to one of the sliding parts. The tape measure then extends around the circumference of a body to be measured, then through the other sliding part and, then, again through the first sliding part. The loop thus formed may be extended by stretching the elastic band. By consecutively locking and unlocking the tape in stretched and non-stretched conditions of the elastic band, a measurement of the circumferential length may be made with a predetermined axial tension in the tape measure to avoid reading errors generated by varying tape tension when measurements are made on elastic bodies.

REFERENCES:
patent: 1857523 (1932-05-01), Wittel
patent: 2428980 (1947-10-01), McCann
patent: 4433486 (1984-02-01), Muehlenbein
patent: 4441258 (1984-04-01), McDaniel et al.
patent: 4459754 (1984-07-01), Yasuda et al.
patent: 4473949 (1984-10-01), Schechtman

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