An Improved Chimney Top and Ventilator.
Year: 1898

page_text: Date of Application, 1st Jan., 1898
Complete Specification Left, 2nd Aug., 1898-Accepted, 31st Dec., 1898
PROVISIONAL SPECIFICATION.
An Improved Chimney Top and Ventilator.
JOHN DENNY WRIGHT, of 20, Manville Road, Upper Tooting, in the County of
Surrey, General Merchant, do hereby declare the nature of this invention to be as
follows:
-
The improvement consists in constructing chimney tops and ventilators. with
suction apertures or ducts both in the base & body, the top is of a semi cone shape
slotted, whereby a strong suction current is obtained so that the escape of smoke
and vitiated gases is promoted without noise or motion whilst .down draught is
neutralised, rain and snow also are almost entirely excluded.
In the construction terra cotta, petrifitte, iron, or any kind of metal is applicable,
and any shape base can be used, upon which base is fastened a band or strip, built
up in a helix form the convolutions enlarging in diameter at the top, upon this is
affixed a slotted cylinder 12 in. or 14 in. in diameter which is bent cone form to a
diameter of 6 in. or 7 in. thus forming a semi cone crown, which induces a strong
suction current preventing down draught, it also acts as a guard against wind,
rain, and snow, from any quarter, and yet can be swept as readily as the chimney,
the whole being strengthened by rivets to three strong stays especially made and
adapted for the construction of the tops and ventilators.
The ventilator is of like construction producing a constant suction current, there-
by removing irrespirable gases, it has an ornamental top which prevents down
draughts, and can be varied in design to suit any building for which ventilators
are required.
An Improved Chimney Top and Ventilator.
JOHN DENNY WRIGHT, of 20, Manville Road, Upper Tooting, in the County of
Surrey, Merchant, 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:-
2461 C
The improvement consists in constructing chimney tops and ventilators, so that
the escape of smoke and the products arising from the combustion of fuel is greatly
facilitated, whilst a downward draught through the chimney is to a great extent
prevented.
In the construction terra-cotta petrifitt, iron, or any kind of metal, is applicable
and any shaped base can be used having two suction apertures or ducts, opposite
to each other to which base is attached three strong stays, around these is fixed a
band or strip also having four or more suction apertures or ducts bent into a helix

page_text: form, having a space between the convolutions, which slightly overlap each other,
and as the convolutions rise they increase in diameter, upon this is placed a cylinder
or crown of 12 inches to 14 inches in diameter, which is perforated in slots the ends
being fastened at the top cone shape to a circle 6 inches to 7 inches in diameter,
thus forming a semi-cone crown which acts as a guard against the wind from any
quarter of the compass, thereby largely preventing rain, snow, or sudden gusts of
wind descending the chimney, and thus impeding the free egress of the smoke,
also the suction currents passing through the slots of the semi-cone crown top will
give an additional draught sufficient to neutralise a sudden down blast.
The ventilator is of a similar form the suction currents caused by the semi-cone
crown being very strong so as to remove the vitiated and irrespirable gases, it has
an ornamental finish which entirely prevents down draughts and can be modified
to suit any position or buildings.
I will now describe the sheet of drawings.
Fig. 1, vertical section of chimney top.
Fig. 2, plan projection of chimney top.
Fig. 3, plan projection of semi-cone crown.
Fig. 4, vertical section of ventilator.
Figs. 5 & 6, stays for fixing ventilator top.
Figs. 7, 8 & 9, stays used in both chimney top & ventilator.
In construction any shaped base can be used Fig. 1, a, a, to the upper end is
fixed a strip b, b, b, fastened to three stays c, c, c, Figs. 1 and 2, which are placed
at angles of an equilateral triangle, thus forming a spiral having a space between
the convolutions which convolutions increase in diameter, upon this is placed a
cylinder d, d, 12 inches to 14 inches in diameter which is slotted, a ring of the same
diameter is fastened in the middle, the ends are then bent to meet in a smaller circle
of 6 inches to 7 inches in diameter, thus forming a semi-cone crown or the middle
ring can be omitted thus forming a more graceful finish for the cylinder or top
as shown in Fig. 1-e, e.
For ventilators the ornamental top as shown in Fig. 4, is fixed over the semi-cone
crown in-such a way as to cover and shield all the slots and suction currents, thereby
preventing down draughts, whilst the spiral up currents generates a force whereby
the vitiated and irrespirable gases are carried off.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed:-
1st. I declare that what I claim as an improvement and which greatly accelerates
the up currents are the suction apertures or ducts particularly placed in the base
and also in the band or strip forming the body of the chimney top & ventilator.
2nd. The semi-cone crown which forms a guard in every direction, at same time
causing strong suction currents whereby the rain, snow, and wind, are almost
entirely, prevented from descending the chimney and yet not preventing the free
egress of the smoke, the sweeps brush can also be passed quite through, and cleanse
the top, and in the ventilator the suction currents formed by the semi-cone crown
causes the vitiated and irrespirable gases to be split up and carried off with great
velocity.
3rd. The formation of the three strong stays or supports without which the band
or strip containing the suction apertures or ducts and the slotted semi-cone crown
top, cannot be securely built up so as to withstand the pressure of storms.
4th. The formation of two shaped stays which are required to be used in making
the ventilator top, and securing it to the body.
.