Improvements relating to devices for centreing a solid of revolution on a given reference axis, notably for machining centres of railway rolling-stock axles

摘要

1,034,835. Machining centres. S.A. H. ERNAULT-SOMUA. April 18, 1963 [May 9, 1962], No. 18278/63. Heading B3C. In a method of centring railway vehicle axles, Figs. 1, (2 not shown) and 3, means comprising two V-supports 3 which co-operate with the axle journals and are slidable vertically in guides 7 are adjustable vertically by screws 8 within the supports 3 which are carried on footstep bearings 12. The axis of the screws is coincident with the plane bisecting the angle of the V-support. The screw 8 is counter-bored at 16 and threaded at the upper portion 17 to carry an externally threaded sleeve 9 which is keyed to the V- support 3 to prevent its rotation but permits sliding movement. Mounted for vertical sliding movement within the sleeve 9 is a rod 10 constituting a feeler member having a contact head 15 urged upwards by a spring 14 for engagement with the journal being centred, and provided at its lower end with a bent finger 19 to engage a micro-switch 11. The relationship between the angle V of the support and the vertical movement of the sleeve 9 with the feeler head 15 relative to the vertical movement of the screw 8 is established trigonometrically and for a V-angle of 60 degrees, the thread pitch of the sleeve 9 being half the thread pitch of the screw 8. The method of centring the axle is as follows; the V-support is raised to its uppermost position with the sleeve 9 fully retracted therein, the axle journal is positioned on the support and the screw 8 is rotated to lower the support at the same time the feeler head 15 with the sleeve 9 is raised in relation to the support. When the feeler head 15 contacts the journal surface the finger 19 actuates the micro-switch 11 and the vertical movement of the support is stopped at the position required.