Measuring instrument

Details Measuring instrument Measuring instrument

1978-05-31

1979-11-20

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 318, G01B 500

Patent

active

041745752

ABSTRACT:
A measuring instrument with two feeds for its spindle. A first sleeve is keyed to a second sleeve so the sleeves can move axially relative to each other but cannot rotate relative to each other. A spindle is threaded into the second sleeve and moves axially when its thimble is rotated to provide the first feed. A second thimble has a first thread engaging a thread of the first sleeve and a second thread engaging a thread of the second sleeve. Rotation of the second thimble moves the second sleeve and spindle axially to provide the second feed. The first and second threads can be selected to provide a fine feed or a coarse feed of the second sleeve and spindle.

REFERENCES:
patent: 672622 (1901-04-01), Isherwood
patent: 2467499 (1949-04-01), Sachtleber

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