Improvements in and connected with Chimney and Ventilating Shaft Tops.
Year: 1894

page_text: Date of Application, 29th Jan., 1894
Complete Specification Left, 25th Oct., 1894-Accepted, 1st Dec., 1894
PROVISIONAL SPECIFICATION.
Improvements in and connected with Chimney and Ventilating
Shaft Tops.
WILLIAM COLIN MORISON Lympstone Devon Gentleman do hereby declare
the nature of this invention to be as follows:-
This device is to enable wind or suitable currents of air in the open which may
act on the outside of said device to create an upward draught through the chimney
or ventilating shaft with which it may be connected.
It consists of a, preferably square, short vertical pipe with an open space in the
central portion of each of its four sides the width, horizontally, of each of said
spaces being about half the width of the side of the pipe and the depth, vertically,
of each of said spaces being about three times the width of said space.
Fixed to and projecting at right angles from, and in width equal to, each side of
said square pipe there is a short tube, of preferably rectangular cross section, the
depth of which is somewhat more than once and a half its width and somewhat more
than the depth of each of said spaces respectively; the outer end of each of said
tubes being open.
Each of said open spaces is furnished with a vertical covering plate, each two of
which plates opposite each other are rigidly connected, parallel with each other, by
means of rods; to the outside of each plate is fixed a projecting horizontal piece
carrying at its outer end a pin on which works the lower end of a link the upper end
of which works, respectively, on a pin fixed to the under side of the upper
portion of each of said tubes in such manner that each two opposite links, working
in the same plane, support the pair of covering plates with which they are
connected and as the lower ends of said links oscillate they carry the said plates
to and from the corresponding spaces; thus as the wind impinges against the back
of one plate causing it to close its space, the opposite plate is moved from its
corresponding space thus allowing smoke to escape through the latter space from
the chimney; said smoke also escapes through either one or both of the other
two spaces according to the positions of the other two plates.
According to the strength of the wind which may blow against and by the
sides of said top an upward draught is created through the chimney, or
ventilating shaft, with which said top may be connected.
To the lower portion of said top is fixed a suitable pipe by means of which said
top may be connected with a chimney or shaft as may be desired.
This 17th d... of Tona 1901
W. C. MORISON.
COMPLETE SPECIFICATION.
Improvements in and connected with Chimney and Ventilating
Shaft Tops.
WILLIAM COLIN MORISON 66 Alcester Road Birmingham formerly of
Lympstone, Devon Gentleman 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 a certain form of chimney and ventilating shaft top preferably

page_text: made of galvanized sheet iron with the small working portions respectively
preferably of suitable steel, brass, and copper, or of such other material,. o
materials, as may be deemed most suitable.
The nature of this top, under ordinary circumstances, enables it not only to
prevent wind from blowing down, but also to cause the wind to create an upward
draught in, the chimney, or shaft, to which it is applied, as explained by the
following description and accompanying drawings of which Fig. 1, is a side view
with the side casing of a portion of the head of the top broken off to show
clearly interior parts; and Fig. 2, is a plan on top with portions of the covering
pieces broken off to show interior parts clearly. The letters of reference apply
to the same parts in both figs.
The shaft a is preferably made square at the base or foot and round at its
upper end where it connects with the head from which project the four short
tubes b, c, d, e, (together on top somewhat in the form of a cross) open at their
outer ends, and into which the four spaces or openings b, c, d, e, from the
upper end of the shaft respectively lead.
Through said openings the two rods (preferably made of steel galvanized or
painted),g, pass at right angles to each other, g, being below f. The rod frigidly
connects the two covering plates or shutters h, i, together in the middle of their
upper ends and parallel with each other; while the rod g, connects in like manner
the two shutters k. l. Said shutters are respectively suspended in front of said
openings, which suitably correspond in form and dimensions with said shutters, by
means of the lower ends of the wires (preferably copper) 1, 1; 2, 2; 3, 3; 4, 4;
(all of which are not shown) duly connecting with the outer ends of the arms
(preferably brass) 5, 5; 6, 6; 7, 7; 8,8; fixed respectively to and projecting from
the outer sides of the lower ends of said shutters while the upper ends of said wires
are respectively duly connected with suitable pieces fixed to the under sides of the top
portions respectively of said tubes (as shown in Fig. 1) in such manner that a
slight force suffices to operate each pair of shutters to and from said openings
respectively; so that even a light wind blowing against one of said shutters will
cause it to move to, and close, the opening it is in front of at the same time that it,
by means of its said connecting rod, moves the shutter it is connected with
correspondingly from the opening the latter is in front of, so that as one opening
becomes closed the opposite opening becomes open for the free escape of
smoke, &c.
The normal position of said shutters is, as shown, at half stroke which allows
smoke, or foul air, to escape through and from said openings respectively though,
of course, not so freely as when the shutters are respectively at their full outward
stroke.
When the wind blows directly into the open end of one of said tubes it also
travels across the open ends of the two tubes the axis of each of which is in
line with the other and which axes are then at right angles to the direction of
the wind which thus draws the air outwards through the open ends of said
two tubes and thus creates an upward draught in the chimney, or shaft, to which
said top is fixed.
The guide bars n respectively one on each side of the upper and lower ends of
said shutters prevent said shutters unduly oscillating sidewise.
The manner of suspending each pair of shutters may be, of course, considerably
modified; but I prefer the arrangement described, and shown by the accompanying
drawings.
In the upper end of the head of the top is formed a round hole which is
suitably covered by the small round cover m partly broken off to show clearly the
positions of the rods f, g.
With the view of enabling the shutters to close said openings practically
noiselessly, leather, or other suitable material, may be suitably fixed round said
openings for the shutters to strike against.
If desired, with the view of greatly preventing the entrance of snow into said

page_text: open ended tubes a number of suitable wires, or the like, may be suitably fixed to
said open ends, across, or lengthwise downwards, or in both directions.
The rods f, g, may either be suitably rivetted or bolted, as preferred, respectively
to said shutters which are preferably made of galvanized sheet iron suitably
stiffened by a portion of each of their sides lengthwise, and ends being bent
outwards at right angles as shown in Fig. 2, by a portion of h being broken off.
I do not confine myself to exactly the shape or form shown of said top or of any
part of it as said form, or forms, may, of course, be considerably modified, and very
readily so.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that what 1
claim is,
1st. The construction or general arrangement and combination of the parts of a
chimney and ventilating shaft top substantially as, and for the purpose, herein
described, and shown by the accompanying drawings.
2nd. The shutters h, i; k, l; fixed in pairs and operated substantially as, and for
the purpose, herein described, and shown by the accompanying drawings.
3rd. The tubes b, c, d, e, projecting from the head of the top in combination with
the shutters h, i; k, l; substantially as, and for the purpose, herein described, and
shown by the accompanying drawings.
4th. The employment of leather, or other suitable and well known substance,
round the openings b, c, d, e, substantially as, and for the purpose, herein
described, and shown by the accompanying drawings.
Dated this 23rd day of October 1894.
W. C. MORISON.