An Improved Cap or Cowl for Preventing Down-draught in Chimneys and Ventilating Shafts and Analogous Purposes.
Year: 1888

page_text: Date of Application, 23rd Nov., 1888
Complete Specification Left, 23rd Aug., 1889-Accepted, 28th Sept., 1889
PROVISIONAL SPECIFICATION.
An Improved Cap or Cowl for Preventing Down-draught in
Chimneys and Ventilating Shafts and Analogous Purposes.
I JOSEPH LAMING of 22 Thorn Street Reading in the County of Berks Tin Plate
Worker do hereby declare the nature of my said invention to be as follows:-
The object of my invention is to manufacture an improved Cap or Cowl for pre-
venting down-draught in chimneys, ventilating shafts, lamps and analogous articles
and structures.
My invention consists of a hollow cone, open at the base, suspended in a central
position immediately above the chimney pot or other terminal of the chimney or
Alue.
-
This cone is sustained by a strut or struts projecting from a ring fitted to the
ordinary chimney or flue, and reaching up to the inner side of the apex.
An open frame is also fitted to and sustained by the ring surrounding the cone,
to which it acts as a guard, and prevents the loss of the cone in high winds.
The base of the cone is of larger diameter than the chimney pot or other terminal
of the flue, and, when unaffected by the wind, it is concentric with the flue and
slightly above it.
When pressed by the wind, the weather side of the base of the cone is driven
against the terminal of the flue, and the escape of smoke and air takes place on the
lee side; the cone having a pendulous motion.
The cone may be suspended by simply resting upon the upper end or united ends
of the strut or struts; or it may be suspended by means of a ball and socket joint,
the ball being sustained by the internal strut or struts or by the external framing.
The terminal of the flue is provided with a rubber or other ring to render silent
the contact of the cowl and prevent vibration.
Dated 23rd November 1888.
GEO. DOWNING,
Agent for Applicant.
COMPLETE SPECIFICATION.
An Improved Cap or Cowl for Preventing Down-draught in
Chimneys and Ventilating Shafts and Analogous Purposes.
I JOSEPH,LAMING, of 22 Thorn Street Reading in the County of Berks, Tin plate
worker, do hereby declare the nature of my said 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 manufacture an improved cap or cowl for pre-
venting down-draught in chimneys, ventilating shafts, lamps, and analogous articles
and structures.
My invention consists of a hollow cone, open at the base, and suspended in a
central position immediately above the chimney pot or other terminal of the chimney
or flue.
This cone is sustained by a strut or struts attached to the inner side of a ring
or cylinder fitted to the ordinary chimney or flue, and reaching up to a suitable
bearing near the apex of the cone.
An open frame is also fitted to and sustained by the cylinder, such frame
surrounding the cowl, to which it acts as a guard and prevents its loss in high
winds.

page_text: Ja
The base of the conical cowl is of larger diameter than the chimney pot, or other
teruiinal of the flue, and, when unaffected by the wind, it remains concentric with the
flué..
I sometimes find it advantageous to affix to the lower part of the cove a short
cylinder as hereinafter described....
When pressed by the wind, the weather side of the cowl is driven against the
terminal of the flue, and the escape of smoke and air takes place on the lee side,
the cowl having a pendulous motion.
The cowl may be suspended by simply resting upon the upper end or united ends
of the strut or struts, or it may be suspended by means of a ball and socket joint,
the ball being sustained by the internal strut or struts, or by the external framing.
The terminal of the flue is provided with a, rubber or other ring to render silent
the contact of the cowl and prevent vibration or such ring may be attached to the
lower inside edge of the cowl; for the same purpose..
And in order that my said invention may be particularly described and ascertained
reference is hereby, made to the accompanying drawings, in which similar letters of
reference indicate corresponding parts.
Fig. 1 is an elevation showing one form of my invention, applied to an ordinary
flue, and Fig. 2. is a.sectional, elevation of the same.
a is an ordinary chimney pot attached to a flue. is a metal cylinder firmly fixed
to the chimney pot.c is a bent bar, pointed at the top, upon which the cowl vibrates.
d is the conical portion of the cowl... eis a ring or cylinder attached to the lower part
of the cowl. is a bearing which sustains the cowl and allows of its vibration upon
the point of the bar c. gg is an open frame or cage fixed to the cylinder b which acts
as, a guard and prevents the; cowl-being blown away in high winds. is a rubber or
other ring attached to the cylinder b. to prevent vibration and noise arising from the
contact of the.cowl with the cylinder b.
:
In Fig. 1 the cowl is shown in a position concentric with the flue, unaffected by
wind. In Eig. 2 the cowl is shown pressed on one side by the wind, partially closing
the flue on the windward side, and providing ample space for the emission of smoke on
the leeward side.
-
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: The manufacture and use of conical.cowls, with or without the addition of the
ring or cylinder e; such cowls being suspended upon a central point above the flue,
so as to vibrate thereon, substantially as hereinbefore described and illustrated by the
drawings.
2. The general construction, arrangements, and combination of the several and
respective parts together forming my.invention of an improved cap or cowl for pre-
venting down-draught.in. chimneys and ventilating shafts and analogous purposes
substantially as herein before described and illustrated by the drawings..
Dated 2.23rd August 1900
.
GEO.. DOWNING,
8, Quality Court, London, W.C., Agent for Applicant.