Improvements in Chimney or Ventilating Shaft Tops for the Pre- vention of Down-draft to Chimney, Soil, or other Ventilating Pipes.
Year: 1892

page_text: Date of Application, 28th June, 1892
Complete Specification Left. 21st Jan., 1893-Accepted. 11th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in Chimney or Ventilating Shaft Tops for the Pre-
vention of Down-draft to Chimney, Soil, or other Ventilating
Pipes.
MEDMER GOODWIN 61 Wells Street Camberwell London Builder & Contractor
do hereby declare the nature of this invention to be as follows:-
My present invention is as follows to construct a chimney or ventilating shaft
top of any number of cones or louvres one above the other cach cone or louvre
being made larger in diameter as they ascend. Within the walls of these cones or
louvres near the top is attached to a spindle hung from the top a. conical or other
shaped circular plate (fixed or movable) about the same diameter as the bottom or
second cone or louvre. The top cone or louvre is at its top edge made just large
enough to allow of the said plate wich is hung central to be pushed out (where
used for chimneys) by the sweeps brush falling in its place when the brush is with-
drawn.
The advantages of this invention are
1st. That when the down draft takes place the wind that enters at the top strikes
the suspended plate and is led through between the cones or louvres.
2nd. That where used for chimneys every part can be cleaned by the sweeps
brush the same as an ordinary chimney shaft.
3rd. That it causes no check to the smoke or air rising.
All the parts may be made in metal such as galvanized sheet iron zinc or any
other material or materials that may be suitable.
28th June 1892.
MEDMER GOODWIN,
61, Wells Street, Camberwell, London.
COMPLETE SPECIFICATION.
Improvements in Chimney or Ventilating Shaft Tops for the Pre-
vention of Down-draft to Chimney, Soil, or other Ventilating
Pipes.
I, MEDMER GOODWIN, of 61, Wells Street, Camberwell, in the County of
Surrey, Builder and Contractor, 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 tops for chimneys or ventilating or other shafts or pipes,
and has mainly for object the prevention of downdraught.
In carrying out my invention I form the chimney or other top of a series of
louvres or coned rings arranged one above another, each louvre or ring being larger
in diameter than the one immediately below it. In the upper part of the series of
louvres is suspended a baffle or deflecting plate which is advantageously of a conical
form, the said plate being suspended in such a manner that when employed in con-
junction with,chimney tops it will be moved out of the way when a sweep's brush
is employed to sweep the chimney and return to its normal position when the brush
is withdrawn.
In order that my invention may be clearly understood reference is had to the
accompanying drawing, in which Figure 1 is a vertical section of a chimney top
constructed according to my invention, and Figure 2 is a vertical section at right
angles to Figure 1 of the upper part of the same.
a is the base of the chimney top and b, bare the louvres or coned rings mounted

page_text: thereon and arranged one above another, they being connected together by ties c, c
in a well known manner. Each louvre or ring, as shown in the drawing, is larger
in diameter than the one immediately below it.
d is the baffle or deflecting plate which is advantageously coned as shewn and is
suspended by links e, e from eyes f,attached to an extension of the upper coned
ring. By suspending the baffle in this manner it will be caused, when a sweep's
brush is passed through the chimney top to assume approximately the position
indicated by dotted lines in Figure 2 and when the brush is withdrawn the said
baffle will swing back into its normal position.
By this construction downdraught is entirely prevented as any air that enters the
top of the chimney top is deflected through the openings between the top louvres or
rings, as shewn by arrows, the gradual increasing in diameter of the louvres or
rings also giving greater freedom for the up-draught.
Although I have described the baffle or deflecting plate in combination with a
chimney or other top having a series of louvres or coned rings each of which is
larger in diameter than that immediately below, 1 wish it understood that it can
also be employed in conjunction with the well known form of chimney or other top
having a series of louvres or coned rings of equal diameter.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
(1.) A top for chimneys or ventilating or other shafts provided with a series of
louvres or rings each of which is larger in diameter than the one immediately below
it, substantially as described.
(2.) In a top for chimneys or ventilating or other shafts provided with a series
of louvres or rings, the employment of a suspended deflecting plate substantially
as, and for the purpose, described.
(3.) The improved chimney or ventilating shaft top substantially as hereinbefore
described and illustrated in the accompanying drawing.
Dated this 21st day of January 1893.
MEDMER GOODWIN.