IMPROVEMENTS IN VENTILATORS AND CHIMNEY COWLS
Year: 1883

page_text: LETTERS PATENT to John Henry Reynolds of Troy in the County of
Rensselaer and State of New York United States of America for an
Invention of " IMPROVEMENTS IN VENTILATORS AND CHIMNEY COWLS
"
a communication from Andrew Jackson Robinson, a person resident at
Boston, in the State of Massachusetts, United States of America
PROVISIONAL SPECIFICATION left by the said John Henry Reynolds at the
Office of the Commissioners of Patents on the 26th November 1883.
JOHN HENRY REYNOLDS, of Troy, in the County of Rensselaer and State of
New York, United States of America, "IMPROVEMENTS IN VENTILATORS AND
CHIMNEY COWLS [A communication from Andrew Jackson Robinson, a person
resident at Boston, in the State of Massachusetts, United States of America]
"
This invention relates to ventilators and chimney cowls and comprises the
peculiar construction of the cap or head for a ventilating shaft or chimney top as
hereinafter described.
According to the said invention the upper plate of the cap is made in the form
of a dome, having around its lower edge a flange which may be curved or flat.
When made in the curved or gutter like form the flanges should be provided with
perforations for the escape of water that may fall upon the dome. The lower plate
is formed like the upper plate but is placed in an inverted position, and secured to
the upper plate by means of brackets so as to leave an opening between the two
dome-like plates.
A pipe or collar inserted centrally in the bottom of the lower plate extends
inwardly to, or nearly to, the lower side of the opening and affords a means of
attaching the cap to a ventilating shaft or chimney top. A. belt or shield is secured
to the outwardly projecting portion of the brackets and is of greater width than
the opening. The diameter of the said belt or shield is sufficient beyond the
flanges to produce an annular opening between the said flanges and belt. The said

page_text: belt forms a shield around the opening between the dome-like plates so as to
prevent currents of external air from striking through the said openings, but the
annular opening, formed between it and the flanges, is ample for the escape of the
internal air that rises through the pipe.
Provision is made, by means of perforations, for the escape of any moisture that
might collect in the concavity of the lower plate.
When preferred, a diaphragm may be attached to the under side of the upper
plate for the purpose of preventing the internal currents of air from rising into the
dome.
With this form of cap an external current of air whether moving upward,
downward, sidewise, or angularly will always produce an upwardly moving current
of air inside of the pipe.

page_text: an Order of the Lord Chancellor filed by the said John Henry Reynolds in
the Patent Office on the 7th June 1884.
JOHN HENRY REYNOLDS, of Troy, in the County of Rensselaer, and State of
New York, United States of America, "IMPROVEMENTS IN VENTILATORS AND
CHIMNEY COWLS"-a communication from Andrew Jackson Robinson, a person
resident at Boston, in the State of Massachusetts, United States of America.
This invention relates to ventilators and chimney cowls, and comprises thé
improvements hereinafter described and illustrated in the accompanying drawing
in which.
F
Figure 1 is a vertical section of my cap for a ventilator, or chimney:
Figure 2, is a like section of a modified form of same:
Figure 3, is a plan view of Fig. 1: and
Figure 4, is a horizontal section, on the line X X, of Fig. 2.
As represented in the drawing the upper plate, A, of the cap is made substantially
in the form of a dome, and, preferably, has around its lower edge a flange, a, which
may be in the form of a gutter-as shown in Fig. 1, or it may be flat, as shown in
Fig. 2; when made in the gutter-like form shown in Fig 1, the flange a may be
perforated with holes a¹ for the purpose of permitting any water, that may fall
upon the dome, to escape therethrough.
The lower plate, B, of the cap should be formed like the upper plate A excepting
that an opening is made in its centre for the reception of a pipe or collar E; said
lower plate is placed in an inverted position, in respect to the upper plate A, and is
secured to the said upper plate, by means of brackets C. so as to leave a parallel
opening D between the two dome-like plates.
The pipe or collar E, inserted centrally in the bottom of the lower plate B,
extends inwardly to, or nearly to, the plane of the lower side of the opening D,
and affords a means for attaching the cap to a ventilating shaft, or a chimney top.
A belt, or shield, F is secured to outwardly projecting portions of the brackets C.
Said belt is of a greater width than the opening D, as shown in Figs 1 and 2, and
its diameter is sufficiently large to produce an annular opening between_said belt
and flanges a; the said belt also forms a shield around the opening D in such
manner as to prevent currents of external air from passing into said opening, bub
the annular opening, between said belt and the flanges a, is ample for the escape of
any internal air that rises through the pipe E. Provision is made, by means of
perforations b, for the escape of any moisture that might collect in the concavity of
the plate B.
When preferred a diaphragm, G, may be attached to the underside of the upper
plate A, as shown in Fig, 2, for the purpose of preventing the internal currents of
air from rising into the crown of the dome.
Experience has demonstrated that, with this form of cap, an external current of
air-whether moving upward, downward, sidewise, or angularly-will always
produce an upwardly moving current of air inside of the pipe E.
I claim as the invention
1. The combination, with the top-plate A, bottom plate B and pipe E; the said
top and bottom plates being arranged to form the opening D, as herein described,
of a belt F arranged to form a shield for the opening D substantially as and for
the purpose specified.

page_text: 2, The combination, with the top-plate A and bottom plate B, provided with
flanges a substantially as described, of the pipe E and belt F, all constructed and
arranged substantially as specified.
3. The combination, with the top-plate A and bottom plate B, arranged as
described to form the opening D and the pipe E, of the brackets C, and belt F
arranged in relation to the plates A and B, and opening D substantially as and for
the purpose specified.
In witness whereof, I, the said John Henry Reynolds, have hereunto set my
hand and seal this 20th day of March, in the year of our Lord 1884.
JOHN HENRY REYNOLDS (L.S.)