An Improved Chimney Top.
Year: 1898

page_text: TRUVIDIONAL DIUITIATION.
An Improved Chimney Top.
I, EDWARD JOHN ROBERT COXHEAD, Sheet Metal Worker, of 165, Clarendon Road,
Notting Hill, W., in the County of Middlesex, do hereby declare the nature of this
invention to be as follows:-
The idea or invention consists of 2 cylinders made of zinc, iron, or any sheet metal,
one cylinder about 8 inches deep and made 2 inches larger diameter than the other,
and placed over the smaller cylinder with a lap of 4 inches. Between the
cylinders is placed a iron ring, made oval, the size of which is the inside
of the large cylinder for the length and outside, the small cylinder for the width,
the iron ring being fitted with 4 pivots one at each end and passed through the large
cylinder 1 inch from the bottom edge, and one pivot each side and passed
through the smaller cylinder 3 inches from the top edge. The large cylinder
will always be tilted somewhat over the small one and so prevent the wind from
blowing the smoke down the chimney. The large cylinder will rotate on the pivots
in the iron ring, the back or highest part always against the wind, forming a cowl
without a spindle.
1000
I, EDWARD JOHN ROBERT COXHEAD, Sheet Metal Worker, of 165, Clarendon Road,
Notting Hill, W., in the County of Middlesex, 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 chimney-top, having for its purposes the
preventing of down blow of wind and smoke into the chimney, and having no
obstruction to the cleaning of the chimney. It consists of 2 cylinders made of
zine, iron, or any sheet metal, one cylinder being 2 inches larger in diameter than the
other and placed over the smaller one, and connected by an oval ring being placed
between them, and to oscillate on pivots in brass bearings, the large cylinder to
rotate as the wind directs, with the lower edge on a rim or astragal fixed on the
small cylinder, so that the large cylinder will ride thereon free of the side of
the small cylinder. As the sizes of chimnies vary, the measurements herein given
are for one size only (namely) for a 12 inch chimney-top, each size smaller being
proportionally made as described hereunder. (Thus) for each one inch less in diameter
of small cylinder (Fig. 1) the bearings and the rim or astragal are placed an inch

page_text: nearer the top edge of the cylinder (Fig. 1) and for each one inch less in diameter of
the large cylinder (Fig. 2) it is made an inch less in the depth.
Fig. 1) Represents a cylinder 12 inches in diameter, by 16 inches or any depth
required for connecting to any existing chimney, the top edge being wired for
strength. At opposite sides and on the outside at 3 inches below the top edge to
centre (a a Fig. 1) I insert and solder brass bearings for pivots, the bearing shown
full size at (Fig. 4) and at 6 inches below the top edge of cylinder is fixed a rim or
astragal, projecting an inch, (d Fig. 1).
Fig. 2) Represents a cylinder 14 inches in diameter by 8 inches deep, curved and
beaded top and bottom, the top curve being largest for the better effect of the wind
on the cylinder, at opposite sides and on the inner side and 1 and inch from the
lower edge to centre (a a Fig. 2) I insert and solder brass bearings for pivots.
Fig. 3) Is the plan showing the oval ring connecting the cylinders, the ring being
made of iron band 1 and of inch wide by of an inch in thickness, the join being
welded or riveted, and galvanized, and made oval in shape, in length equal to the
diameter of the large cylinder, and in width equal to the diameter of the small
cylinder, at each end of the ring and pointing outwards, (bb Fig. 3) and each side of
the ring and pointing inwards, (c c Fig. 3) is riveted a iron pivot an inch in
length by of an inch in thickness. I now place the ring over the small cylinder
with the inward turned pivots into the bearings, at (a a Fig. 1) I then place the
large cylinder over the ring with the outward turned pivots into the bearings, at
(a a Fig. 2) shown also at (b b and c c Fig. 3). I then slightly burr the ends of the
pivots to prevent them drawing out of the bearings, over which I solder to the
cylinders a hollow metal stud to protect the pivots from wet.
Fig. 4) Represents the bearings (shown full size) made of cast brass to prevent
corrosion with the iron pivots, and a hole drilled for pivots.
Fig. 5) Represents the whole being connected and complete, the dotted line
indicating the top of the inner cylinder. It will readily be seen that by the action of
the wind on the cylinder, and the oscillation of the ring combined, that the large
cylinder will be always tilted and will rotate on its lower edge, on and around the
rim or astragal, (d Figures 1 and 5) with the highest part against the wind, thus
shielding the opposite side, and preventing the down blow of wind and smoke into
the chimney, and there being no spindle bar or other obstruction, the top can be
thoroughly cleaned in sweeping the chimney.
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. An improved chimney-top.
2. The construction and use of an oval ring to oscillate on pivots, for the rotary
action of any chimney-top, cowl, or ventilator.
The whole being connected and operating substantially as and for the purposes
herein described and shown by the accompanied drawings.
Dread this 19th dor of Tul.. 1000