An Improved Chimney Cowl.
Year: 1896

page_text: An Improved Chimney Cowl.
JAMES MCLAREN Superintendent Engineer Dersingham Norfolk do hereby declare
the nature of this invention to be as follows:-
An improved chimney cowl, to prevent blow down in chimneys, and assist the
up-draught of same. The apparatus consists of a number of round luffers; made of
sheet iron." or other material" arranged one above the other, about three inches
apart, and set at an angle. When complete it shews six outlets for smoke, five being
formed by the luffers the other being the top outlet. Inside a baffle cone is held in
position to direct the down blow, out through the top luffer opening, while this is
being done, the other four openings are giving free outlet to the smoke. There
is a space round the cone for outlet of smoke upwards, when there is no down blow.
The cone is arranged to slide up and down "guided by three rods" so that the cowl
can be cleaned out by sweeps brush, while the chimney is being swept from below.
The cone can also be raised sufficiently high to allow the chimney to be swept from
above, when necessary.
Dated th: 91
1004
JAMES MCLAREN.
JAMES MCLAREN Engineer Sandringham and Dersingham Norfolk 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 :-
"
The apparatus consists of a number of round luffers made of sheet iron, steel, or
other material. They are arranged one above the other about three inches apart,
and set at an angle of forty five degrees. When finished complete it shows seven
outlets for smoke, six being formed by the luffers, the other being the top outlet,
(the number of outlets would be less for smaller sizes). A baffel cone is held in
position to direct the blow down "or back draught out through the top luffer
opening, while this is occuring, the other five openings are giving free outlet to the
smoke, a space of one inch is left round the cone for the outlet of smoke upwards
when there is no blow-down. The cone is arranged to slide up and down, guided
by three rods, so that the cowl can be cleaned out by sweeps brush while
sweeping chimney from below. The cone can also be raised sufficiently high to
allow the chimney to be swept from above.
The accompanying drawings shew the construction.
Where like letters appear they indicate samne or like parts.
Fig. 1 is an elevation drawing shewing exterior appearance of cowl when complote
letter A being the trunk, upon which is built a number of luffers "B" three inches
apart, between which wind may blow from whatever direction, and always be directed

page_text: side, H-building in flange.
Fig. 2 sectional elevation drawing.
Letter A. Trunk.
Letter B. Luffers.
Letter C. Cone.
Letter D. Guide rods which slide up and down.
Letter E. Terminals on rods, to keep cone from being pushed to far out.
Letter F. Guide brackets for rod sliding into.
Letter G. x 1 inch flat iron bar reaching from that point, to top for riveting
Cluffers and brackets to.
Letter H. Building in flange, also riveted to trunk.
Fig. 3. Plan-drawing.
Letter B. Luffers.
Letter C. Cone.
Letter D. Tripod "attached to cone" which forms part of guide rods.
Fig. 4. Plan of building in flange.
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
1st. The unique design of cowl.
2nd. The form and position of cone, in relation to luffers, also the method in raising
and lowering same.
3rd. The arrangement of luffers in relation to cone, and their mounting as fully
described and illustrated.
Duted this 2nd day of November 1896.
JAMES MCLAREN.