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Патент USA US2114164

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April 12, 1938. '
,A. BUHRER '
2,114,164
HEAD FOR CHIMNEYS AND AIR SHAFTS
Filed Oct. so, 1956
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Fig. 2.
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Patented Apr. 12, 1938
2,114,154
STATES
PATENT OFFICE
2,114,164
HEAD FOR OHIMNEYS AND AIR-SHAFTS
Adolf Biihrer, Zurich, Switzerland
Application October 30, 1936, Serial No. 108,445
In Switzerland November 1, 1935
3 Claims.
My invention relates to improvements in smoke
deflector or sucker heads straddling and cover
ing?the openings of chimneys and air-shafts;
and the objects of my improvement are, first,
to provide for a sucking action of the wind on
the chimney opening; and second, to keep said
action unimpaired in falling winds or down
winds.
I attain these objects by the device illustrated
in) in the accompanying drawing, in which
ward sense, or-?which is even more unfavorable
for the purposes of heating or ventilation?when
it is dropping more or less in a vertical sense
onto the chimney, the atmospheric air ?owing
parallel to the axis of the chimney through the
Fig. 2, a top plan view of the device; and
Fig. 3, a second example of design in vertical
section.
A circumferential bulge b, comprising two
parts of conical surfaces 0 and d, is rigidly fas
in the conically enlarged diffusor space p. The
latter is formed by the conical surfaces 0 and n
of, respectively, the bulge-ring c-d and of the
hollow cylinder 70. The wind therefore may blow
tened to the top of the chimney a.
in any direction without ever causing a ?ow back
Straps e,
attached to the top part of said bulge at suit
able intervals, carry at their outer ends the
peened bottom of a sheet-iron cylinder f in
rigid connection.
and bottom and
chimney-top, and
?5 the height of the
"
and maintained in both the lower and upper
annular channels h and 0 which, from within
the chimney, is constantly fed. An accelerated
speed of evacuation is thus attained for the
smoke rising out of the chimney or, similarly, ?
for the spent air drawn out of an air-shaft,
When, however, the wind is blowing in an up
and the chimney top;
Fig. 1 is a vertical section of the entire device
"
(Cl. 98?84)
Said cylinder is open on top
is held co-axially with the
its bottom edge g is lying at
top rim of the said surface at.
The diameter of said cylinder is such that an
annular channel h is set free between it and
said bulge-ring c?d. Straps i are fastened,
annular channels h and 0 produces a vacuum
into the chimney which would jeopardize the
chimney draft or the correct functioning of the
ventilation through the airshaft.
My present invention yet ful?lls another pur
pose. It is well known that the chimney draft
particularly in the summer and in a bright sun
is very much decreased, since the necessary dif- 25
ference and drop of temperature then is lack
ing on account of the relatively high outside
temperature. In order then to eliminate or, at
at suitable intervals, to the top rim of said cyl
least, materially to reduce the damaging in?u
inder at one end and at their other end to the
top of a second sheet-iron cylinder 7c. The lat
ter possesses a conical top and bottom cover
ence of said phenomenon, the air-?lled hollow 30
cylinder it serves as heat-insulating unit so that
the air underneath the latter is heated but to a
small extent. Due to a similar insulating effect
and is suspended co-axially with the ?rst cyl
inder, and its diameter is materially greater
;;~, than that of the chimney-top. The apex of
the conical bottom of the said cylinder 70 is set
at some distance above the chimney-top. Rain
running down the vertical side m of the cylinder
of the bulge-ring b enclosing the top of the
chimney, said insulating effect is extended to
some distance below the top of the chimney so
that the operation of the heating plant does not
meet any di?iculties, so much less since, more
of the outer cylinder f, the total height of which
equals that of the latter.
The action of the present head of chimney is
the following: With the wind blowing horizon
over, at most times the simultaneous sucking
action of a wind current is existing.
What I claim and desire to secure by Letters
Patent is:
1. In a head for chimney and air shaft open
ings the combination of: a sleeve having a cy
lindrical body portion and conical upper and 45
lower side faces surrounding the said chimney
adjacent the upper end thereof; an outer cyl
inder connected at the lower end thereof to
said sleeve; a central member suspended within
said outer cylinder and connected at the upper 50
end thereof adjacent to the upper end of said
outer cylinder; said central member having a
cylindrical body portion and a conical bottom
face and the axes of said central member and
tally, a zone of increased pressure is built up
said outer cylinder being coaxial with that of 55
is will drop oil? the circumferential lip-bulge l
31) formed by joining the bottom n and the side
m onto the top part c of the said annular bulge
c-d and thence onto the roof. Between the
said cylinders f and k a second annular channel
0 is set free through which the smoke or the
i3 ?ue-gases may escape into the atmosphere.
In order to increase the sucking action of
horizontal air currents on the chimney draft,
two identical hollow annular frusta of cones
qi and (12, the bottom circles of which coincide,
50 may be mounted on the outside circumference
2
2,114,164
said chimney shaft and the diameters of said
sleeve and said central member being less than
that of said outer cylinder, so that an annular
channel is formed between said sleeve and said
outer cylinder and between the latter and said
central member, at least over a part of the cir
cumference, and the upper conical face and the
cylindrical body portion of said sleeve and the
body portion and bottom face of said central
10 member lying wholly within said outer cylinder.
2. In a head for chimney and air shaft open
ings the combination of: a sleeve having a cy
lindrical body portion and conical upper and
lower side faces surrounding the said chimney
15 adjacent the upper end thereof; an outer cyl
inder connected at the lower end thereof to said
sleeve; a central member suspended within said
outer cylinder and connected at the upper end
thereof adjacent the upper end of said outer
20 cylinder; said central member having a cylin
drical body portion and- a conical bottom face
and the axes of said central member and said
outer cylinder being coaxial with that of said
chimney shaft and the diameters of said sleeve
25 and said central member being less than that
of said outer cylinder, so that an annular chan
nel is formed between said sleeve and said outer
cylinder and between the latter and said central
member, at least over a part of the circumfer
30 ence, the upper conical face and the cylindrical
body portion of said sleeve and the body portion
and bottom face of said central member lying
wholly within said outer cylinder; and the said
upper conical face of said sleeve and said bot?
tom face of said central member having a com
mon apex on the vertical main axis of said head.
3. In a head for chimney and air shaft open
ings the combination of: a sleeve having a cy
lindrical body portion and conical upper and
lower side faces surrounding the said chimney
adjacent the upper end thereof; an outer cyl
inder connected at the lower end thereof to 10
said sleeve; two annular conical frusta having
coinciding base circumferences on the outer sur
face of said outer cylinder and being of a height
equal to that of said cylinder; a central member
suspended within said outer cylinder and con
nected at the upper end thereof adjacent to the
upper end of said outer cylinder; said central
member having a cylindrical body portion and a
conical bottom face and the axes of said central
member and said outer cylinder being coaxial 20
with that of said chimney shaft and the diam
eters of said sleeve and said central member
being less than that of said outer cylinder, so
that an annular channel is formed between said
sleeve and said outer cylinder and between the 25
latter and said central member, at least over a
part of the circumference, and the upper coni
cal face and the cylindrical body portion of
said sleeve and the body portion and bottom
face of said central member lying wholly within 30
said outer cylinder.
ADOLF BI'JHRER.
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