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 The
need for controlling high level ventilation in buildings is
universally appreciated, and wherever out of reach windows
are incorporated there is a requirement for simple, economic
and unobtrusive type of gear.
This is no longer a problem with the application of the wide
range available. The advantages offered enable a number of
high level windows to be opened and closed from a single operator,
located in some cases a hundered feet away. The problem of
difficult building contours is also overcome by the ability
of the transmitting conduit to be had bent on site with the
aid of a simple tool.
The system is based upon a unique form of cable having an
over-wound helix wire to form a flexible rack.
This
cable, enclosed in a rigid conduit, engages a suitably hobbed
wheel in the operator and head unit, where in a push pull
action, imparted by rotation of the handle, drives the mechanism
to open and close windows. The line drawigs shown below explain
in some detail both priciple and typical application.
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