AN IMPROVED VENTILATING ACTION
Year: 1885

page_text: I, DAN AUBERT of Vauvert Road, St Peter's Port in the Island of Guernsey,
Merchant & Engineer do hereby declare the nature of my invention for AN
IMPROVED VENTILATING ACTION and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
This invention has for its object improvements in apparatus for opening holding
and closing Skylights Casements and Ventilators, etc, which are hung upon pivots
or hinges, and is designed to alter the position of such sashes or Ventilators to any
required extent whether open or closed, and to hold them firmly in such new
position without danger of running back, not withstanding the force of gravitation
or wind pressure exerted upon them.
To effect this, the method adopted is to attach the jointed lever which opens the
sash or flap to a worm-wheel (or a segment of one) of suitable pitch, in such manner
that the axle shaft of the worm-wheel and the fulcrum of the lever shall be
identical the radius of the worm-wheel (or segment) being in fact one arm of the
lever. The lever and warm-wheel can thus be cast in one piece if preferred. The
aforesaid worm-wheel works in conjunction with and is actuated by a worm fixed
in a Shaft or rod which worm and rod may be placed vertically or horizontally or
at any preferred angle and may be caused to rotate by a pully and chain, a rope, or
by bevelled cog wheels or in any other manner preferred. It will be observed that
in this improved apparatus the worm and worm-wheel in conjunction are employed
as the direct instruments for operating the jointed levers. This is an essential part
of this invention, and possesses several important advantages over the ordinary
systems, in which the worm and wheel are sometimes employed in a subsidiary
position or in an initial stage of the mechanical action.
Amongst the advantages claimed are the following.
(1.)-The worm holds the lever automatically in the position desired and
withstands all tendency to run back on its part.
(2.) Any required amount of leverage is obtainable with the least possible
amount of strain on the shaft and the action below; and the remaining parts of the
apparatus can be made of a simple, light, and inexpensive description.
ונג...D

page_text: (3.) The number of bearings
lessened and friction is decreased so that less
force is needed to set the apparatus in motion, and there is less danger of its getting
out of order.
In the accompanying drawings.
Figure 1 represents the apparatus with the worm in a vertical position, and the
wormshaft worked from below, with a pair of bevelled Cog wheels."
Figure 2-Shows the worm applied horizontally and the power communicated
from below by a rope and pair of hollow rim pulleys.
A. is the worm B. the worm-wheel C. D. the jointed lever holding the sash in
the closed position. The shaded lines E. F. G. shew the position of the lever when
the sash is open.
Similar letters denote similar parts in each drawing.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
(1.) The employment of a jointed lever which shall be attached to a worm-
wheel so that the axle-shaft of the worm-wheel forms the fulcrum of the lever, and
one arm of the lever is composed of the radii of the wheel. (or of a segment thereof)
substantially as and for the purpose described.
(2.) The combination of a worm of suitable pitch working in conjunction with
a worm-wheel for the purpose of directly operating the jointed levers which open
the sash or ventilator flap substantially in the manner herein before described.