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HWE61.1 mounted on drive tie-bars
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Drive tie-bars in the track
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Attachment of the drive tie-bar to the foot of the rail

Drive Tie-Bar in new Design

Drive tie-bar mounting is ideal for deployment of the 61.1 point machine in flat-bottom rail track. Four brackets are attached to the foot of the rail and hold the two tie-bars which run between the left and the right rail respectively.  By Bernd Meyer-Jarchow

Compared to the versions “with earth case” and “with special housing for sleeper attachment”, this method of mounting the point machine has many advantages:

  • The flow of the setting and locking force is short and direct. Only the bracket and tie-bar lie within the flow of force, but not the sleepers. 
  • In the case of temperature-induced linear expansion of the rails and tongues, the point machine simply moves in accordance as it is attached to the foot of the rail.
  • A standard housing can be used for the point machine, individual adaptation of the housing e.g. to sleeper clearances and heights is not necessary.
  • Point design is easier as the mechanical interface between point and point machine rarely requires individual consultation. Attachment to the sleeper is not required. Tie-bar mounting requires much less space than an earthcase.
  • Where critical components (rods, lever box, cable entry) require special protection, vandalism protection can simply be added.

In the past months, HANNING & KAHL has completely revised and improved the drive tie-bar system following internal workshops where our service technicians and design engi-neers defined new requirements and collected ideas for implementation. The outcome is a solution with many benefits:

  • The brackets now consist of one part (not two) which is attached to the foot of the rail with locking-box screws. The locking-box screws are proven in use for external locks on side-mounted railway point machines. The screw connections on the brackets are also freely accessible from the outside. This greatly simplifies assembly of the brackets and orientation of the point machine in the point.
  • There is now only one type of bracket for all rail profiles. Adaptation to the rail profile is realised with a compensating piece which compensates differences in the thickness of the rail feet.
  • The new tie-bars take up less space than their predecessors, enabling greater tolerances for the sleeper position in the point.
  • There is no longer a difference between insulated and non-insulated version: there is now only the insulated version. This makes project planning and parts storage easier. There are only differences in the gauge (length of the tie-bars). Two versions are sufficient (normal gauge and metre gauge) to cater for a wide range of application conditions.

The new design of drive tie-bars replaces the former version and shall be deployed for all current projects. Perhaps also soon in yours?