Year: 1888

page_text: Date of Application, 11th Dec.. 1888
Specification Accepted, 22nd Jan., 1889
I, THOMAS ARUNDEL ALDRIDGE of Wombdon in the County of Somerset, Accountant,
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 is designed to supply a Chimney Top, or Ventilator top, which
will give an upward draught in any state of the wind, by a fixed arrangement
of a combined double cone, or partly conical and partly funnel shaped enclosure,
with moveable flaps; placed around a vertical pipe.
It will be best understood by reference to the accompanying drawings in which
the arrows show the direction of the air currents.
Fig. 1 shows a sectional elevation of my improved chimney Top with its outer
enclosure of the double cone B. C.
Fig. 2 shews a plan in section of the same at the line YZ the upper cone B
being removed.
Fig. 3 shews one of the swing doors or flaps used in the openings of the lower cone
or funnel. The detached door is shewn both in elevation and section. The opening
where this door hangs is shown in Fig. 1 by dotted lines.
It will be seen that the ascending smoke or spent air passes directly upwards
through the slightly tapered inner flue pipe A, and ascends into the upper part
of the cone B. Here it encounters the external currents which have entered
above the cone or by the moveable flaps F, in the lower cone C, and is carried
upwards and outwards above the cone B.
The flaps F can only open inwards and consequently any downward current is
impossible since it would at once close the flaps F and find no exit. It must
therefore return and find its exit between the top of the cone B, and cap G.
Below the cone B is the lower cone or funnel C, which is connected to the
flue pipe A, by the diagonal vertical partitions E. The lower cone or funnel C
which terminates at the line Y Z, has also a sloping flange D projecting inwards
at an angle of about 60% and resting on the top of the partitions E.

page_text: This flange terminates at about half the length of the partitions,' and thus
leaves an open annular space between the flange D, and the flue pipo A for the
passage of the air currents which enter by the doors F. These doors swing
lightly on pivot joints at each end in such manner that their usual position is
closed, but they easily open before any external wind pressure.
My improved Chimney-top will I anticipate prove very useful in small sizes for
the tops of flue pipes of Gas Stoves and ventilating pipes of various kinds, but it
is also suited for chimneys of all sorts and of different sizes.
.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed,
declaro. that
what I claim is.
(1) A fixed Chimney or Ventilator Top consisting of a flue pipe surrounded by
and attached to an enclosure placed vertically consisting of two cones joined at
their largest end, or a cone and funnel similarly connected the lower conc. having
an internal flange partitions, and flaps, as herein described and set forth.
Dated this 11th day December 1888.
S. S. BROMHEAD,
97, Newgate Street, E.C.,
Patent Agent.