GB708910A - - Google Patents

Abstract

708,910. Gauging toothed gears. BROWN & SONS (HUDDERSFIELD), Ltd., D. Jan. 7, 1952 [Oct. 7, 1950], No. 24533/50. Class 106 (2) A device for testing the form of involute helical gear wheels, Figs. 1 and 2, comprises two spaced parallel bars a, b adapted to rest on the tips of the gear teeth c and to lie parallel to the axis of the wheel, two members d, e extending at right angles to the plane of the bars a, band having plane surfaces adapted to rest against one side face of the gear, and a frame f, g, h connecting the bars a, b together the members of the frame being at right angles to the bars a, b, The frame forms two sides i, i' of a right-angled triangle the hypotenuse of which is represented by a line i<SP>2</SP> joining the two bars a, b. A carriage j on the frame capable of being moved in a direction parallel to a plane defined by those parts f, g of the frame constituting one side i of the triangle and along a straight line k making with the side face of the gear an angle corresponding to the base lead angle of the gear, a stylus r on the carriage j adapted to contact a tooth flank, and an indicator s operated by the stylus r. The arrangement of the parts being such that movements of the stylus occasioned by errors in tooth form take place in a plane n tangential to the base cylinder p of the gear and perpendicular to the base helix.