Geometrical instruments – Gauge – Screw thread
Patent
1986-02-03
1988-12-13
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Screw thread
331795R, 33600, G01B 500
Patent
active
047900741
ABSTRACT:
An apparatus tests rack teeth of a rack member for a rack and pinion vehicle steering gear. The apparatus comprises a support for mounting the rack member for longitudinal displacement and a helically toothed test pinion member having an axis. A carriage mounts the test pinion member for rotation about its axis and in driving engagement with the rack member. A resilient biasing spring urges the test pinion member into engagement with the rack member and provides a predetermined lateral spacing between the longitudinal axis of the rack member and the axis of the test pinion member. A screw adjusts the biasing force of the resilient biasing spring at the predetermined lateral spacing. A drive effects displacement of one of the rack and test pinion members to impart displacement to the other of the rack and test pinion members. A first sensing device senses the displacement of one of the rack and test pinion members which results from successive and predetermined unit displacement of the other of the rack and test pinion members. A second sensing device senses a variation from the predetermined lateral spacing between the axes of the rack and test pinion members which is caused by the unit displacements.
REFERENCES:
patent: 2350788 (1944-06-01), Martin
patent: 2369477 (1945-02-01), Martin
patent: 2669028 (1954-02-01), La Femina
patent: 2819532 (1958-01-01), Praeg
patent: 3694923 (1972-10-01), Heiberger
"New Principle Employed in Gear Checking Machine, " Machine Design, Jun. 1948, pp. 128-130.
Rogers Peter R.
Warr Roland A.
Cuchlinski Jr. William A.
Scanlon Patrick R.
TRW Cam Gears Ltd.
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