An Improved Cap or Cowl for Preventing Downdraught in Chimneys.
Year: 1893

page_text: Date of Application, 23rd Feb., 1893
Complete Specification Left, 7th July, 1893-Accepted, 12th Aug., 1893
PROVISIONAL SPECIFICATION.
An Improved Cap or Cowl for Preventing Downdraught in
Chimneys.
We, SAMUEL CHANDLER and JOSIAH CHANDLER, both of Central Works,
Kennington Oval, in the County of London, Gas Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to an improved cap or cowl for curing smoky chimneys
by preventing downdraught.
According to the said invention the shaft of the cap or cowl has at a suitable
distance above it a conical top, of the same or slightly larger diameter than the
shaft. This cap is fixed to rods sliding in guides and adapted to be lifted to such
an extent that when the ordinary chimney sweeping brush strikes against it it will
allow the brush to pass above the top of the shaft to thoroughly sweep the same,
suitable stops, such as nuts, on the lower ends of the rods being provided to prevent
the said top from being pushed off. Around the opening between the shaft and
the sliding top and above and below the same is a shield or guard.
Dated the 23rd day of February 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improved Cap or Cowl for Preventing Downdraught in
Chimneys.
We, SAMUEL CHANDLER and JOSIAH CHANDLER, both of Central Works,
Kennington Oval, in the County of London, Gas Engineers, 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 an improved cap or cowl for curing smoky chimneys by
preventing downdraught.
According to the said invention the shaft of the cap or cowl has at a suitable
distance above it a conical top, of the same or slightly larger diameter than the
shaft. This top is fixed to rods sliding in guides and adapted to be lifted to such
an extent that when the ordinary chimney sweeping brush strikes against it, it will
allow the brush to pass above the top of the shaft to thoroughly sweep the same,
suitable stops, such as nuts on the lower ends of the rods being provided to prevent
the said top from being pushed off. Around the opening between the shaft and
the sliding top and extending below the same is a shield or guard.
To enable our invention to be fully understood we will describe how it can be
carried into practice by reference to the accompanying drawing in which :-
:-
Figure 1 is a vertical section of a cap or cowl constructed according to our
invention for preventing downdraught in chimneys.
Figure 2 is a horizontal section on the line 2-2, Figure 1.
Similar reference letters in both figures indicate similar parts.
a is the shaft of the cap or cowl and 6 is the conical top which is of larger
diameter than the said shaft and supported at a distance above it so as to form an
opening for the escape of the smoke. The top is advantageously composed of
annular louvres c, c and a cone d connected together by suitable connecting pieces e, e
between which additional openings are formed for the escape of the smoke.
fff are the rods fixed to the top 6 and provided with the stops 9, 9, 9

page_text: and h, h, h are the guides in which the said rods slide. i is the shield or guard
surrounding the opening between the top and the shaft a and extending below the
said opening and connected to the said shaft by the connecting pieces j, j, the said
shield or guard carrying the guides h, h, h; or the said guides may be connected to
the shaft a. The shield or guard i is advantageously formed with an inturned
flange k corresponding with the louvres c, c of the top b, the said top being supported
by collars 1, 1, 1 on the rods f, f, f resting upon the said flange k.
By this construction downdraught will be effectually prevented in a chimney to
which our cap or cowl may be applied as any downdraught which may occur in the
said cap or cowl will pass away through the open lower end of the guard i, and
when the chimney is swept, the top 6 will yield and allow the brush to pass clear of
the top of the shaft a so as to thoroughly sweep the same.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A. chimney cap or cowl consisting of a tubular shaft, a top movable relatively
with the said shaft and an outer shield or guard, substantially as and for the
purposes set forth.
2. The improved chimney cap or cowl hereinbefore described, and illustrated in
the accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.