Precision length measuring instrument

Details Precision length measuring instrument Precision length measuring instrument

1979-11-19

1981-07-07

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

33125C, G01B 702

Patent

active

042766966

ABSTRACT:
An improved height measuring instrument includes a hollow profile support member measuring a scale mounted to the support member, and a relatively flexible guide member which is adjustably mounted to the support member by means of a plurality of threaded fasteners which can be used to push or pull the guide member to correct measurement errors. A measurement carriage is guided along the guide member. This carriage bears an intermediate member onto which is mounted both a sensor and a reading unit arranged to scan the scale. A spring parallelogram including a pair of opposed, parallel plate springs connects the intermediate member to the carriage to provide a substantially constant measuring force. An apparatus is disclosed for altering the spring constant of the parallelogram to compensate for the proper weight of the intermediate member, the reading unit, and the sensor. This apparatus includes two knife edges mounted on the intermediate member and a cylinder, spring mounted on the carriage and biased into contact with the knife edges.

REFERENCES:
patent: 2627119 (1953-02-01), Grahan
patent: 3939569 (1976-02-01), Squires
Journal of the Optical Society of America, "Development of the Ruling Art", vol. 39, #6, 6/49, pp. 413, 422.

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