AN IMPROVED CHIMNEY TOP AND VENTILATOR
Year: 1884

page_text: JOHN DENNY WRIGHT of 4 Lupus Street, Pimlico in the County of Middlesex.
General Merchant, do hereby declare the nature of my said invention for AN
IMPROVED CHIMNEY TOP AND VENTILATOR, to be as follows:
The Improvement consists, in constructing Chimney Tops and Ventilators, with
strong shaped continuous Stays, so that the escape of Smoke and vitiated gases,
shall be assisted by a constant Spiral up-current, without noise or motion, thereby
preventing a Down-draught.
In the construction, any shaped Base can be used, to the upper end of which
base, is fixed, a strip bent into a Spiral form, having a space between the successive
convolutions, which overlap each other, and increase in Diameter horizontally.
Upon this is placed a cylinder, forming the Top, which Top can be perforated, (or
otherwise). in Slots, as shall be thought most fitted to cause Draught, and for the
best Interests of this Invention. The whole is strengthened by a most important
Improvement-Three strong shaped continuous stays, placed inside and securely
fastened to the convolutions from top to bottom, at angles of an Equilateral
Triangle, and which continuous stays, can be modified to any shape, required.
The Chimney Top has a Lever cover, with Flange on the lower side, so formed
that when the sweep's Brush is passed through, the cover lifts up, and when the
Brush is drawn back, it catches the Flange of the cover, which is thereby closed.
The said cover is fastened to the Top by a spindle, running through a socket and
two holes in the Chimney Top.
The Ventilator is of like formation, producing a constant spiral up-current,
thereby removing foul and unhealthy gases. It has an ornamental Top, preventing
Down-blow, and which can be modified to suit any position, for which Ventilation
may be required.
The said Improved Chimney Top and Ventilator can be made in any suitable
material.

page_text: JOHN DENNY WRIGHT, of 4 Lupus Street, Pimlico, in the County of Middlesex,
General Merchant, do hereby declare the nature of my said Invention for AN
IMPROVED CHIMNEY TOP AND VENTILATOR, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement:—
The Improvement consists in constructing Chimney Tops and Ventilators, with
strong shaped continuous stays, so that the escape of smoke and vitiated gases,
shall be assisted by a constant spiral up-current, without noise or motion, thereby
preventing down-draught.
In the construction, any shaped base can be used, to the upper end of which
base, is fixed a strip, bent into a spiral form, having a space, between the successive
convolutions which overlap each other, and increase in diameter horizontally.
Upon this is placed a cylinder, forming the Top, which top is perforated in slots
or otherwise as shall be thought most fitted to cause draught, and for the best
interests of this Invention. The whole is strengthened by a most important
improvement three strong shaped continuous stays placed inside, and to which
the convolutions are securely fastened, from top to bottom, at angles of an
equilateral triangle, and which continuous stays, can be modified to any shape
required.
The Chimney Top has a Lever cover with flange on the lower side, so formed
that when the sweep's brush is passed through, the cover is raised, and when the
Brush is drawn back, it catches the flange of the cover, which is thereby closed.
The said cover, is fastened to the Top, by a spindle, running through a socket in
the cover, and two holes in the Chimney Top.
The Ventilator is of like formation, producing a constant spiral up-current,
thereby removing vitiated and irrespirable gases. It has an ornainental Top, so
fixed as to cover and shield the slots, thereby preventing down-blow, and which
can be modified to suit any position, for which Ventilators may be required.
The said Improved Chimney Top and Ventilator, can be made in any suitable
material.
I will now describe the sheet of Drawings:
Fig: I. Vertical section.
Fig. II. Plane Horizontal projection.
Fig. III Lever Cover of Chimney Top.
Fig. IV. Vertical section of Ventilator Top.
Figs. V. VI and VII. Plane View of three continuous stays, also shewn. d. d. d.
in Figs I and II,
In construction any shaped Base can be used, Fig. I. a. a. to the upper end of
which is fixed a strip, b. b. b. which is securely fastened to the three continuous
stays, Figs. V. VI and VII. which are placed at angles of an equilateral triangle
as shewn in Figs. I and II. d. d. d. thus forming a spiral, having a space between
the successive convolutions, which over lap each other, and increase in diameter
horizontally, Upon this is placed a Cylinder, C. forming the Top, which can be
perforated in slots or otherwise, Fig. III. is then fixed to the top of Fig. I. by a
Spindle, e. e, running through a socket. f. f. and two holes in top of Fig. I, g. g.
The Stays, Figs. V, VI and VII, can be modified to any shape required.
For Ventilation Fig. IV. is fixed on the top of Fig. I. in such a way as to cover,
and shield the slots, in Fig. I, thereby preventing down-draught, whilst the Spiral
up-current generates a force, whereby the vitiated and irrespirable gases, are
carried off.

page_text: Having now particularly described and ascertained, the nature of my Invention,
and in what manner the same is to be performed,
I. I declare that what I claim is an Improvement, in the construction by strong
shaped continuous stays, running from top to bottom, of a Spiral Chimney Top
and Ventilator, which accelerates the up-currents, without noise or motion, and
thus insuring a strong and durable article.
11. The Lever cover, which allows the sweep's brush, to pass up, without
injury to the Top, and on being drawn back, causes the cover to close again.
III. The ornamental Top, for Ventilator, which whilst it prevents down-draught,
or rain and snow from entering, has through being a fixture, great advantages
over all moveable covers, and greatly promotes steady and constant up-currents,
This Ventilator can be modified as desired for any purposes of Ventilation.
Dated this 6th day of February 1884.