GB411758A - Improvements in steering gear for mechanically propelled vehicles and the like - Google Patents

Abstract

411,758. Cams. MARLES STEERING CO., Ltd., Winchester House, Old Broad Street, London.-(Marles, H.; and Gemmer Manufacturing Co. ; 6400, Mt. Elliott Street, Wayne, Michigan, U.S.A.) Dec. 2, 1933, No. 33920. [Class 80 (iii).] In steering gear of the kind described in Specification 196,374, [Class 80 (iii)], in which a roller 26 carried by the rocker shaft 32 engages a thread on the helical cam or worm 10 so that one diameter of the central plane of the roller extends radially to the worm shaft when the gear is in its central position, the centre of the central plane of the roller is offset from that axial plane of the worm intersecting the rocket shaft axis at right angles, and the rocker shaft is moved axially to adjust the extent of engagement between the worm and the roller. In the construction shown the roller is mounted on roller bearings 27 on a pin 30 carried by a forked part 31 of the shaft 32, the roller axis being parallel to the axis of the cam 10 but slightly to one side of the vertical plane passing through the cam axis so that axial movement of the shaft 32 adjusts the mesh of the roller with the cam. The shaft 32 has a shoulder 37 bearing against an abutment 39 by means of a soft metal washer 38 and shims 41. An adjusting screw 42 keeps the shaft in position and adjustment is effected by adding or removing shims 41. The pin 30 may be mounted eccentrically so that the roller and cam may be adjusted independently of the shaft 32. The roller is axially positioned on the pin 30 by means of hardened steel washers 34. A pair of spaced rollers may be used instead of the grooved roller. The cam 10 rotates in bearings 12, 13 adjusted by means of a soft metal washer 20 and/or shims kept in place by the end cap 21 of the casing 18.