Re: Kadee minimum body box widths

Denny Anspach <danspach@...>

Didn't one of the really old Kadee couplers use
this technique -- a #4 perhaps? I'm pretty sure
one of them used a coil centering spring.<
Yes, and they are still available, and reportedly are still chosen by
a small set of modelers that very much like the "slack action" that
the #4's internal longitudinal springs allow. They are considerably
different in design and concept from the #78, and in this regard they
really have very little real relationship

The #4 has a long slot in the shank just wide enough to fit over a
square post within its own cast metal dedicated coupler box. With the
coupler shank over the post, the remaining portion of the slot is
filled with a tiny (that is- *tiny*) spring that holds the shank
against the post while at the same time pulling the shank back to
center when the coupler swivels. What is different is that the coupler
does not swivel against the post but swivels against cast-in columns
in the sides of the coupler box- as explained well by Dennis.

I still have a great number of cars equipped with #4s, and they
operate as well as could be expected, but test one's patience in
either repair or replacement. The couplers fit no other coupler
boxes, except a number of cast metal boxes common to a number of early
manufacturers in the '50s and '60s (MDC?). In contradistinction, none
of the usual standard couplers will fit the #4's box.


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