Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1988-11-01
1990-03-20
Parker, Roscoe V.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116571, 36447406, E01B 3117
Patent
active
049089935
ABSTRACT:
The machine which comprises serveral grinding heads per stretch of rail and which may be moved with respect to height by means of lifting devices is equipped with an installation for automatically lifting grinding wheels (M1to M8) in the critical zones of switches, namely frog and blade zones.
This installation comprises, on either side of each stretch of rail (R1, R2), a pair of sensors (C1, C2, C3, C4) at the front and a pair of sensors (C'1, C'2, C'3, C'4) at the rear, detecting the starts of critical zones, therefore the widening of the running tread in the zone of a switch and/or their auxiliary parts adjacent to the rails; a computation unit connected, on the one hand, to the sensors and, on the other hand, to each lifting device and equipped with a memory containing all the data defining the lifting distances of each grinding head in the critical zones; a unit for measuring the path traveled connected to the computation unit; the computation unit is provided in order to command the lifting and the lowering of each grinding head independently, over memorized distances, as a function of signals received by the sensors.
REFERENCES:
patent: 4115857 (1978-09-01), Panetti
patent: 4584798 (1986-04-01), Rivoire
patent: 4785589 (1988-11-01), Buhler
patent: 4829723 (1989-05-01), Ball et al.
Les Fils d'Auguste Scheuchzer S.A.
Parker Roscoe V.
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