Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A railway tie indexing device for locating a trade maintenance workhead, mounted on a vehicle chassis for movement along the track, above a work station; comprising a ballastengaging shoe mounted for movement with said workhead; means for operatively resiliently biasing said shoe downwardly into the ballast; a profiled lower edge on said shoe adapted to ride up and over a tie encountered in its path of movement along the track, against the action of said biasing means; a loaded indexing finger mounted on said shoe for movement relative thereto and projecting beneath said lower edge; and switch means actuated by the movement of the finger relative to the shoe, to terminate workhead forward movement.
Claim 2
Dependent Claim
114 words
A railway tie indexing device for locating a trade maintenance workhead, mounted on a vehicle chassis for movement along the track, above a work station; comprising a ballastengaging shoe mounted for movement with said workhead; means for operatively resiliently biasing said shoe downwardly into the ballast; a profiled lower edge on said shoe adapted to ride up and over a tie encountered in its path of movement along the track, against the action of said biasing means; a loaded indexing finger mounted on said shoe for movement relative thereto and projecting beneath said lower edge; and switch means actuated by the movement of the finger relative to the shoe, to terminate workhead forward movement.
Claim 3
Dependent Claim
22 words
A device as claimed in claim 1 in which the loaded indexing finger is spring loaded for movement through railway trAck ballast.
Claim 4
Dependent Claim
46 words
A device as claimed in claim 1 in which the shoe is mounted on a cylinder of a piston and cylinder device, the piston of which is fixed relative to said chassis, the shoe being vertically reciprocable on said cylinder in guides fixed to said chassis.
Claim 5
Dependent Claim
38 words
A device as claimed in claim 3 in which the resilient biasing of the shoe into engagement with the ballast is achieved by a source of hydraulic pressure, including an accumulator, acting on said piston and cylinder device.
Claim 6
Dependent Claim
117 words
A railway tie indexing device for locating a track maintenance workhead, mounted on a vehicle chassis for movement along the track, above a work station; comprising a ballast engaging shoe mounted for movement with said workhead; means for operatively resiliently biasing said shoe downwardly into the ballast; a profiled lower edge on said shoe adapted to ride up and over a tie encountered in its path of movement along the track, against the action of said biasing means; a loaded indexing finger pivotally mounted on said shoe for pivotal movement thereon and relative thereto, said finger projecting beneath said lower edge; and switch means actuated by the pivotal movement of the finger to terminate workhead forward movement.
Claim 7
Dependent Claim
117 words
A railway tie indexing device for locating a track maintenance workhead, mounted on a vehicle chassis for movement along the track, above a work station; comprising a ballast engaging shoe mounted for movement with said workhead; means for operatively resiliently biasing said shoe downwardly into the ballast; a profiled lower edge on said shoe adapted to ride up and over a tie encountered in its path of movement along the track, against the action of said biasing means; a loaded indexing finger pivotally mounted on said shoe for pivotal movement thereon and relative thereto, said finger projecting beneath said lower edge; and switch means actuated by the pivotal movement of the finger to terminate workhead forward movement.
Claim 8
Dependent Claim
27 words
A device as claimed in claim 2 in which the pivotal movement of the finger moves a cam which trips the switch means fixed to the shoe.