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posted: 22 Apr 2012 22:47 from: Les Waters click the date to link to this post click member name to view archived images |
Hello I am under the impression that an A switch would have 5 slide chairs and a B switch would have 6 slide chairs. Does it follow that a C switch has 7 and a D switch 8? I hope this is not a dumb question? Many thanks in anticipation. Regards Les |
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posted: 22 Apr 2012 22:59 from: Martin Wynne
click the date to link to this post click member name to view archived images |
Les Waters wrote: I am under the impression that an A switch would have 5 slide chairs and a B switch would have 6 slide chairs. Does it follow that a C switch has 7 and a D switch 8? I hope this is not a dumb question? Many thanks in anticipation.Hi Les, Copied from http://templot.com/martweb/templot_forum.htm Sorry about the poor quality of the scan, it is about 15 years old. It needs doing again. rea_chairs.gif These are the special chairs used for REA semi-curved switches. The numbers are the total for the whole switch, i.e an A switch has 5 P chairs per switch blade. P chairs are the ones on which the switch blade slides and to which the stock rail is fixed by means of a bolt through the rail web instead of a key. Block chairs come next and hold the both the switch blade and stock rail at the correct spacing (these are handed and numbered 1,2,3 etc.). The bolts and distance blocks fit between the rails to keep everything secure. So for a B switch each side has (counting from the rail joint) : 2 standard chairs in front of the switch toe, 6 slide chairs, 4 block chairs, Standard chairs and bridge chairs are then used as space on the timbers permits. PJ chairs are a later design in which the outer jaw is in the form of a separate spacer block, similar to flat-bottom slide baseplates. |
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posted: 23 Apr 2012 10:51 from: Les Waters click the date to link to this post click member name to view archived images |
Martin Many thanks for this. This is a very comprehensive reply. Regards Les |
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