An Improved Ventilator.
Year: 1894

page_text: Date of Application, 1st June, 1894.
Complete Specification Left, 21st Feb., 1895-Accepted, 1st June, 1895
PROVISIONAL SPECIFICATION.
An Improved Ventilator.
EDWARD NICHOLLS 84 Neate Street Camberwell, S.E. Zine Worker I do hereby
declare the nature of this invention to be as follows:-
An opened backed " ventilator" made in five sections, with hood three shells and
rim, overlapping each other, with one inch space between each, at back which
diminishes round to the sides, these are jointed together round the throat. (The
construction of the above is similar to an ordinary lobster backed cowl.) Working
on a spindle with feather on top of hood to keep the back to the wind so that the
wind is always blowing through which causes a up draught by forming a body of
wind round the smoke or foul air which disperses it.
Dated this 31st day of May 1894.
EDWARD NICHOLLS 84 Neate Street Camberwell, S.E. Zinc Worker I do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to an improved construction of ventilator cowl whereby the
draught of the chimney or air shaft to which it may be applied is greatly improved
and the occurrence of down currents prevented.
The invention is illustrated in the accompanying drawings, forming part of this
Specification, wherein Figure 1 is a vertical section and Figure 2 an external
perspective view of the cowl.
The same letters of reference refer to the same parts in both figures.
The shell of the cowl is constructed of a number of zones or segments, say five
for example, namely the hood A, the intermediate segments B, C, D, and the rim E,
so shaped and combined as to form a cowl similar in form to the lobster-back cowl
except that instead of being closed at the back the cross-joints between the over-
lapping segments are left open about to a width, say, of three-fourths of an inch at
the back diminishing to nothing at the sides, through which openings a large body
of wind deflected by striking against the upwardly inclined back surfaces of the
intermediate sections is admitted to the interior of the cowl and passing over the
smoke or foul air promotes the suction-in the chimney or shaft.
The hood A and intermediate zones or segments B, C, D, are formed of strips
of sheet metal cut of a shape adapted to the position they are to occupy, the zones
or segments B, C, D, being in the form of conical frustums. These are assembled
together and united to form the shell, as shewn, by the smaller end of the one
entering the larger end of another, the overlapped segments being rivetted or
soldered together for about one-third the way round to form the throat of the cowl,
as shewn, the other two-thirds being left open to form the gaping joints at the back
FD
017

page_text: of the cowl, above referred to, the hood segments and rim being further connected
together towards the back by one or more internal metal straps f.
The shell thus constructed is poised in the ordinary way to revolve on a vertical
spindle 9 carried by a cross-bar fixed to the chimney top, the segment B being for
this purpose provided with a steel bearing block that rests on the spindle point
and enclosed in a tube i extending down the spindle so as to take a lateral bearing
against the spindle, the tube being connected at its lower end by cross-arms to the
rim E.
The hood is provided with the usual vane or feather to keep the back, of the cowl
towards the wind.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
A ventilating cowl constructed of overlapping segments, of substantially the form
shewn, united at the underside or throat and presenting at the back of the cowl
upwardly deflecting surfaces and open joints between the segments for the admission
of wind, substantially as specified.
Dated this way of Apr 109.
A. M. & WM. CLARK,
53, Chancery Lane, London, Chartered Patent Agents.