Bore gauge head assembly

Details Bore gauge head assembly Bore gauge head assembly

1982-03-11

1983-12-13

Little, Willis

Geometrical instruments

Area integrators

Electrical

33147K, G01B 512

Patent

active

044198302

ABSTRACT:
A head assembly is provided for use in a bore gauge and is adapted to actuate either a mechanical readout, such as a dial indicator, or an electrical readout, such as a linear varible differential transformer connected to a digital display. A U-shaped centralizing arm pivoted to the body of the head assembly is provided with a pair of floating centralizing ball contacts. A first measuring ball contact is mounted at the outer end of a threaded extensible stem bearing a graduated scale and adapted to be adjusted as to radial extension. A second sensing ball contact is mounted for adjustment on a resiliently mounted finger which drivingly engages a transfer rod. The transfer rod is operatively connected to the readout device whether a dial indictor or LVDT. A ball and groove driving arrangement is provided between the transfer rod and the pivotal finger.

REFERENCES:
patent: 1452780 (1923-04-01), Beard
patent: 2451419 (1948-10-01), Vinyard
patent: 2930134 (1960-03-01), Bishop et al.
patent: 3442020 (1969-05-01), Worthen
patent: 4170831 (1979-10-01), Olasz

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