Improved Apparatus for the Prevention of Downdraught, and for Obtaining Increased Updraught in Chimneys and Ventilating Shafts, and for the Extraction of and Preventing the Return of Foul Air in Ventilating Shafts in Public Buildings, Railway Carriages, Ships Cabins, and other Structures.
Year: 1895

page_text: Date of Application, 25th July, 1895-Accepted, 16th Nov., 1895
COMPLEIE DIEV
Improved Apparatus for the Prevention of Downdraught, and for
Obtaining Increased Updraught in Chimneys and Ventilating
Shafts, and for the Extraction of and Preventing the Return of
Foul Air in Ventilating Shafts in Public Buildings, Railway
Carriages, Ships Cabins, and other Structures.
I, RICHARD VARLEY HORSFALL of Slaithwaite, in the County of Yorkshire,
Gentleman, 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 :-
This invention relates to certain additions in the invention that I have described
in the Specification that accompanied my application for a Patent numbered 4651
of 1895, and the application of my said invention with additions, either to chimneys
or to ventilating shafts for the prevention of down draught and for obtaining
increased updraught, and for the extraction of and preventing the return of foul
air in ventilating shafts in public buildings, railway carriages, ships cabins, and
other structures.
I attain the objects named by the means hereinafter described, reference being
made to the accompanying sheet of drawings, in which my invention is illustrated.
Figs. 1, 3, 4, 5 and 6 are side views of ventilators constructed according to this
invention:
Fig. 2 is a sectional plan of Figs. 1, 3, or 4 on line A A.
Figs. 7, 8, and 9 are side views of chimney tops and
Figs. 10 and 11 are side views representing appliances for use either as chimney
tops or for the purposes of ventilation.
In the several views shown on the drawing similar letters refer to similar parts.
In applying my invention for the extraction of foul air from buildings or other
structures such as herein before named, I construct ventilators as shown in Figs. 1
to 6 on the drawing by means of an internal flue as a for connecting with an air
shaft leading from the inside of any place or structure, and a cover d of larger
dimensions placed over said internal Hue so as to leave a space between the flue a
and the cover d. I divide said space by means of partitions c so as to form air
I form air entrances as e of greater or less
passages bas represented in Fig. 2.
area at or near the base of the cover d either as represented in Figs. 1, 3, and 4, or
as Figs. 5, 6, 10, and 11. 1 form the upper portion of the cover d with a baffle d'.
The aforesaid cover d may be surmounted by a moveable or a fixed cowlj either of
the forms as shown on the drawing or of other preferred form. The base g or g¹
of the ventilator may be fixed on a block as that is fitted to a roof or other place
in the ordinary manner. The heated or impure air will pass up the flue a and cold
air will be drawn in through the apertures e, both currents of air meeting at the
upper end of the flue a where the space is contracted by the baffle d' thereby
causing an increased upward draught and the mixed air and gases to pass out at the
top either through the aforesaid cowl or otherwise.
Figs. 7 to 9 represent a form of apparatus such as herein before described
constructed for application to a chimney for the prevention of downdraught.
In Fig. 7 the air inlets which are described in the Specification No. 4651 of 1895
are shown constructed in the form represented for ventilators in Figs. 5 and 6 as
herein before described, the cover d being supported by extensions of the partitions c

page_text: which terminate in a flange or base y': said base may be secured to the brickwork
of a chimney by mortar or cement to about the extent shown by the line B B
leaving the space between said line and the base g of the cover d as air inlet
through which the air will be drawn in the manner described in the aforesaid
Specification. Fig. 7 shows the chimney top surmounted by a cowl j. Figs. 8
and 9 represent said chimney tops constructed without caps or cowls.
Figs. 10 and 11 represent either a ventilator or a chimney top with the cover d
constructed with air inlets e formed in said cover and a base g¹ in combination
therewith.
In order to increase the upward draught in either the ventilators or chimney tops
as herein before described, I form the outer case d of a taper construction, and
thereby obtain a taper form of air passages as représented in Figs. 9 and 11.
I do not confine myself to the precise configuration or shape of either the
ventilators or the chimney tops, as shown on the drawings, as the same may be
constructed in a variety of patterns and designs without departing from the nature
of my invention, but
Having now particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1st. In ventilators for buildings, railway carriages, ships cabins, and other
structures, or for use as a chimney top, the combination of an internal flue as a
parallel or taper air chambers or passages b and an outer cover as d with a baffle d¹
and air inlets e in or at the base thereof, in the manner and for the purpose
substantially as herein before described.
2nd. The application of a chimney top constructed with an internal flue as a in
combination with either parallel or taper air chambers or passages b, an outer case
as d with or without a baffle d', and with air inlets e as Figs. 7 to 9 on the drawing
for the purpose and in the manner substantially as herein before described.
3rd. In ventilators for buildings, railway carriages, ships' cabins, and other
structures, or for use as a chimney top, the combination of an internal flue as a,
parallel or taper air chambers or passages b an outer cover as d with or without a
baffle d', air inlets e, and a base as g₁ Figs. 10 and 11 on the drawing, for the
purpose and in the manner substantially as herein before described.
Dated this 24th day of July 1895.
THOMAS PRESCOTT,
53 Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicant.