Geometrical instruments – Area integrators – Electrical
Patent
1983-11-22
1985-11-05
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 318
Patent
active
045505071
ABSTRACT:
A thread construction of a length measuring instrument wherein a spindle is provided by forming out of a ceramic material an externally threaded portion on the outer peripheral surface thereof. A plurality of externally threaded pieces are cut from an externally threaded member made of a material identical with and having a pitch equal to the externally threaded portion of the spindle and fixedly secured to the inner peripheral surface of a sleeve opposed to the externally threaded portion to thereby make the spindle be of a screw feed type, and the manufacturing method therefor.
REFERENCES:
patent: 1157615 (1915-10-01), Carlson
patent: 1267075 (1918-05-01), Hubbell
patent: 2932898 (1960-04-01), Enders
American Machinist/Metal Working Mfg., "Ceramic Gases & Fixtures" by LeGrand, 1/21/63.
Haroian Harry N.
Mitutoyo Mfg. Co. Ltd.
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