Patent ID: 9656530
Date: 2017-05-23
CPC Classifications: B60G,E01C

Claim:
1. A road construction machine, comprising: a machine frame; a working drum supported from the machine frame for working a ground surface or traffic surface; a plurality of ground engaging supports for supporting the construction machine on the ground surface or traffic surface; a plurality of lifting columns, each one of the lifting columns being connected between the machine frame and one of the ground engaging supports, each one of the lifting columns including two telescoping hollow column members and at least one piston cylinder unit located within the telescoping hollow column members for adjusting a height of the lifting column so that each one of the lifting columns is adjustable in height relative to the machine frame, each lifting column having a lifting position corresponding to a position of one of the two telescoping hollow column members relative to the other of the two telescoping hollow column members; and a plurality of lifting position sensors, each lifting position sensor being coupled with elements of one of the lifting columns, which elements are capable of being displaced relative to one another in accordance with the lifting position of the lifting column in such a manner that a signal including information on a current lifting position of the lifting column is produced by the lifting position sensor, wherein each of the lifting position sensors is connected to the at least one piston cylinder unit located within its associated lifting column.