Manually Controlled Gearing for operating opening vents
The most economical solution, when conditions dictate, is
to control our opening lights with a manual gear. Please
note that Manual gearing can only be used where the operator
can physically open the vents with their hands, via a
detachable mechanical pole or an endless cord.
The most popular types of manual gears are Screwjacks. These
devices can be supplied to open to either a maximum of 150mm
or 300mm in either a brass or chrome finish. They are supplied
with either a neat handle (if the gear can be reached by hand) or
an eyelet at the base for operation by means of a hooked
detachable crank handle. Once a connection has been established
with the crank handle and gear the user is then able to
wind the handle at the bottom end to open and close the opening
The gears are threaded throughout the whole shaft and as they
are turned the corresponding integral threaded bracket attached
to the outer frame of the opening light drives the vent open in the
same manner as the mechanism of a typical nut and bolt.
The detachable crank handles can be supplied in brass or
chrome with quality mahogany handles for high end commercial
contracts or domestic projects and are also available in a less
ornate aluminium version with black and grey plastic handles.
Endless Cord Gears
Where it is not possible to use screwjack gears due to the
opening lights being installed over 3.5 metres from floor level or
if there is a restricted opening below the glazing an endless cord
gear may be considered. These gears incorporate a 5 metre
deep endless cord (10 metres in total) and are operated by
pulling on either end of the cord to allow opening and closing.
These devices can be supplied to open to a maximum of 300mm
Other Gearing types
In vertical applications it is usual to install a folding opener.
These devices can be be supplied in single or double types.
Our access opening lights are fitted with either pneumatic gas
struts or manual hold open stays.