Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1983-03-03
1985-12-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
29406, 29407, 33552, 340686, 340678, 408 16, 409210, G08B 2100
Patent
active
045583129
ABSTRACT:
An apparatus for use in determining the location of a surface of a solid object such as that being machined by a machine tool includes a stylus having an electrically conductive end that is supported by two support members, which are disposed in pressure contact with each other by means of a spring or other bias, one of the two support members being formed to have a spherical contact surface that is a portion of an imaginary sphere concentric with the contact electrode, the other of the two support members being formed so that upon contacting the spherical surface the area of contact is substantially line contact. Either alternatively or in addition to the detection of a electrically conductive surface with the contact electrode, the support members may be provided with electrically conductive surfaces so that upon the contact of the electrode contact with a workpiece the electrically conductive surfaces are moved out of electrical contact, thereby providing an additional indication of the position of the surface to be determined.
REFERENCES:
patent: 3766653 (1973-10-01), McKay, Sr.
patent: 4138823 (1979-02-01), McMurtry
patent: 4153998 (1979-05-01), McMurtry
patent: 4155171 (1979-05-01), McMurtry
patent: 4270275 (1981-06-01), McMurtry
patent: 4360973 (1982-11-01), McMurtry
patent: 4414750 (1983-11-01), De Fazio
patent: 4425061 (1984-01-01), Kindl et al.
Narimatsu Akihisa
Suzuki Nobuyuki
Yonemoto Hiroshi
Eslinger Lewis H.
Sinderbrand Alvin
Sony Magnescale Incorporated
Swann III Glen R.
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