Improvements in Caps, Pots, or Tops for Chimneys, Ventilating Shafts, and the like.
Year: 1892

page_text: Date of Application, 27th May, 1892
Complete Specification Left, 13th Dec., 1892-Accepted, 4th Feb., 1893-
PROVISIONAL SPECIFICATION.
Improvements in Caps, Pots, or Tops for Chimneys, Ventilating
Shafts, and the like.
I, JOHN ISAAC WILLIAMS of 87 Edith Grove in the County of London,
Contractor do hereby declare the nature of this invention to be as follows:-
And it is intended to provide an artificial or superposed top or outlet for
chimneys which may be constructed of earthenware or like suitable material and in
such a manner as to tend to prevent wind currents or the like entering the
chimney proper and for this purpose I provide a loose chimney top or "pot" of any
convenient shape but preferably round or square and I form on one inner side or
face of the same two mouths or lips projecting inwardly in the form of a bracket
and having on their square or ledged faces openings which continue downwardly and
outwardly and communicate with the outside of the device. One of these outlets is
placed near to the top of the inner face of the cap or top and one near to the
bottom thereof on the same inner side or face. On the opposite inner side or face
and in a position corresponding say to half way between the two formerly described
mouths or outlets I form or place a third one of similar construction. Any wind or
current entering the top of the chimney would strike against one or other of these
projecting mouths and pass out again through the outlet which forms a kind of
louvre. I may also form near the top of the cap and over the single inwardly pro-
jecting mouth one or more openings of ordinary louvre form. In the case of a round,
octagonal or other cap I may increase the number of outwardly projecting mouths
and place them in various positions.
Dated this 27th day of May 1892
POPPLEWELL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Caps, Pots, or Tops for Chimneys, Ventilating
Shafts, and the like.
I JOHN ISAAC WILLIAMS of 87 Edith Grove Chelsea in the County of
London 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:―
The object of my invention is to provide an artificial or independently formed
cap, top or outlet for chimneys, ventilating shafts or the like which may be placed
above the main brick or other chimney or shaft for the purpose of preventing wind
currents or the like from entering the main shaft or chimney proper.
In carrying out my invention I form my cap or top of earthenware or other
suitable material (but preferably of plastic material) and somewhat after the
fashion of an ordinary cap but having on one side two openings or mouths with
lower lips projecting inwardly and upwardly and forming diaphragms so as to
deflect wind entering the mouth or top downwardly & outwardly.
On the opposite side of the cap I place one of these lipped openings about mid-
way between the first two and so alternating therewith. I may also form near the
top of the cap and opposite the uppermost lipped mouth one or more openings of
ordinary louvre form.
For the purpose of more fully explaining the nature of my said invention I have
attached to this Specification a sheet of drawings to which I shall now refer,

page_text: made
Figure 1, being a vertical section, and Figure an elevation of a square cap
according to my invention, and on these figures A. A indicate the two openings on
the side shewn by Figure 2 and A' the opposite opening as seen in section
Figure 1. B. B Figures 1 and 2 and B₁ Figure 1, shew the inwardly projecting
lips and C is a louvre opening at top. D is the summit of the main shaft or
chimney to which the cap is attached in any well known manner.
It will be seen that wind currents entering the top of the cap will strike against
one or other of the lips or diaphragms B. B or B₁ and be deflected outwardly
through openings A A or A¹. Wind entering from sides through any of the open-
ings will be diverted upwardly by the lips or diaphragms and so tend to increase
updraught,
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. In caps, pots or super-posed outlets for chimneys, ventilating and like shafts
the use of alternating and opposite openings in the sides thereof such as AA and A¹
having beneath them inwardly projecting lips or diaphragms extending upwardly
within the cap such as B B and B substantially as and for the purposes
herein before described and as illustrated by the accompanying drawings.
Dated this 22nd day of November 1892.
POPPLEWELL & Co.,
17 & 18, Southampton Buildings, London, W.C.,
Agents for the Applicant.