Apparatus for correcting the position of a track

Claim 2

In an apparatus for correcting the position of a track point in an uncorrected track section in relation to a reference extending past said track point along the track from a previously corrected to an uncorrected track section, comprising 1. a reference line having one end in the uncorrected track section and another end in a previously corrected track section, 2. a track position indicator cooperating with the reference line to produce a comparison correction signal, 3. a track position correction indicator associated with the track point in the uncorrected track section and cooperating with the reference line to produce a signal corresponding to the desired correction of the position of the latter track point, 4. track correction means at the track point in the uncorrected track section, a. the track correction means being responsive to the signal produced by the track position correction indicator and moving the track point to the desired position in response to said latter signal, and 5. a control establishing a set ratio between the signals of the track position indicator and the track position correction indicator, a. said ratio determining the desired position, the improvement of providing means for selectively changing the set ratio while the reference line remains in a constant position.

Claim 3

In the apparatus defined in claim 1 wherein the indicators are potentiometers, and the control comprises an electrical control circuit including a voltage source delivering a voltage to the potentiometers, the means comprising variable resistance meanS between the voltage source and at least one of the potentiometers to change the voltage delivered thereto.

Claim 4

In the apparatus of claim 1 arranged to correct the position of the track point in the uncorrected track section vertically to level the track, further comprising a track tamping unit at the latter point, the track position correction indicator being supported on the track at the track tamping unit and the track position indicator being supported on the track in the corrected track section.

Claim 5

In an apparatus for correcting the position of a track point in an uncorrected track section in relation to a reference extending past said track point along the track from a previously corrected to an uncorrected track section, comprising 1. two reference lines having one end in the uncorrected track section and another end in a previously corrected track section, a. one of the reference lines being longer than the other reference line, 2. two threaded spindles, 3. a reference line engaging member threadedly mounted on each of the spindles and movable thereon upon rotation of the spindles, a. each of the members engaging a respective one of the reference lines, 4. a track position indicator cooperation with the reference lines to produce a comparison correction signal, 5. a track position correction indicator associated with the track point in the uncorrected track section and cooperating with the reference line to produce a signal corresponding to the desired correction of the position of the latter track point, 6. track correction means at the track point in the uncorrected track section, a. the track correction means being responsive to the signal produced by the track position correction indicator and moving the track point to the desired position in response to said latter signal, and 7. a control establishing a set ratio between the signals of the track position indicator and the track position correction indicator, a. said ratio determining the desired position, the improvement of providing a transmission between the spindles for selectively changing the ratio of the speeds of rotation of the spindles while the reference lines remain in constant position.

Claim 6

In an apparatus for correcting the position of a track point in an uncorrected track section in relation to a reference extending past said track point along the track from a previously corrected to an uncorrected track section, comprising 1. two reference lines having one end in the uncorrected track section and another end in a previously corrected track section, a. one of the reference lines being longer than the other reference line, 2. two threaded spindles, 3. a reference line engaging member threadedly mounted on each of the spindles and movable thereon upon rotation of the spindles, a. each of the members engaging a respective one of the reference lines, 4. a track position indicator cooperation with the reference lines to produce a comparison correction signal, 5. a track position correction indicator associated with the track point in the uncorrected track section and cooperating with the reference line to produce a signal corresponding to the desired correction of the position of the latter track point, 6. track correction means at the track point in the uncorrected track section, a. the track correction means being responsive to the signal produced by the track position correction indicator and moving the track point to the desired position in response to said latter signal, and 7. a control establishing a set ratio between the signals of the track position indicator and the track position correction indicator, a. said ratio determining the desired position, the improvement of providing a transmission between the spindles for selectively changing the ratio of the speeds of rotation of the spindles while the reference lines remain in constant position.

Claim 7

The apparatus of claim 4, wherein the transmission is an infinitely variable speed transmission.