Improvements in Chimney Tops.
Year: 1889

page_text: Date of Application, 19th Aug., 1889
Complete Soecification Left, 23rd Apr., 1890-Accepted, 21st June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Chimney Tops.
I, WILLIAM BRAMWELL, of 136, Elisabeth Street, Cheetham, Manchester,
Gentleman do hereby declare the nature of this invention to be as follows:-
This Invention consists of an improved form of chimney top of the pivotted cowl
type. The object of the improvement being to obtain a clear open flue right
through from the main flue to the atmosphere so as to allow of the sweeps brush
thoroughly doing its work of cleansing the passage of soot, even to the mouth of the
exit orifice, without meeting with the usual obstructions of cross-bar bearing and
pivot, and at the same time to secure an efficient and sensitive automatically revolving
cowl.
In carrying out my Invention, which is a matter of construction only and
independant of what materials it may be constructed, I make the top of the chimney
shaft, which I shall call the cowl base, in a cylindrical form of any convenient height.
The top edge of this cylindrical base I form slightly bell mouthed or with a flange ;
to this mouth or flange I fix any number of suitable uprights or standards of simple
construction upon which is carried a plate, disc, or bell-cap securely fixed thereto;
such cap doing the twofold duty of serving as a stop for the sweeps brush and as a
support for the pivot of the cowl. Preferably it would be bell shaped so as to
allow of the sweeps brush getting well past the exit opening in order that the
cleaning may be thoroughly done. On this cap I place the bearing or pivot for the
cowl, the position of which should be the centre of two imaginary spheres upon
which the upper and lower revolving joints of the cowl should be made as hereafter
immediately described. The cowl body is necessarily cylindrical, at any rate about
the two joints, and it has a side opening for the exit. Its top end forms a loose fit to
the fixed cap by a joint spherically related to the pivot point, as above stated. Its
bottom end also forms a loose fitting joint spherically related to the pivot point, as
in the case of the top joint, the latter joint being formed about the bell-mouth or
flange of the base cylinder. The object of this peculiar spherical adjustment of
pivot and joint is to allow of a considerable amount of sway or oscillation without
the joints touching and causing friction and obstruction to revolution; also that such
oscillatory motion will tend to rub off any accumulation of soot, dirt, or corrosion.
With the same object of preventing friction by the accumulation of soot &c. I prefer
the top of the cowl cylinder to be open with merely a cross-bar to carry the pivot.
The pivot may be made cup form so as to hold a lubricant, or it may be made with
an inverted cup fixed to the cowl crossbar and resting on a cone point fixed to the
cap; or the cap itself may be pointed for the purpose and the crossbar of the cowl
may be hollowed for the purpose. In the latter cases a lubricant may not be
required. The wearing parts of the pivot may be made of glass, metal, or any other
suitable material as may be found convenient.
Dated this 17th day of August 1889.
HERBERT GUTHRIE,
Agent for the Applicant.
Agent for the Applicant.
I WILLIAM
COMPLETE SPECIFICATION.
Improvements in Chimney Tops.
BRAMWELL, of 136 Elizabeth Street, Cheetham, Manchester,
5 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, that is to say :-
This Invention consists of an improved form of chimney top of the pivotted cowl
Di Q77

page_text: type. The object of the improvement being to obtain a clear open flue right through
from the main flue to the atmosphere so as to allow of the sweep's brush thoroughly
doing its work of cleansing the passage of soot even to the mouth of the exit orifice
without meeting with the usual obstructions of cross-bar bearing and pivot shaft and
at the same time to secure an efficient and sensitive automatically revolving cowl.
In carrying out my Invention, which is a matter of construction only and
independent of what materials it may be composed, I make the top of the chimney
shaft, which I shall call the cowl base, in a cylindrical form of any convenient height,
shape and size and capable of covering either one or more flues. The top edge of
this cylindrical base I form slightly bell mouthed or with a flange, and to this
mouth or flange I fix any number of suitable uprights or standards of simple
construction upon which is carried a plate, disc or bell cap securely fixed thereto,
such cap doing the twofold duty of serving as a stop for the sweep's brush and as a
support for the pivot of the cowl. Preferably it would be bell shaped so as to allow
of the sweep's brush getting well past the exit opening in order that the cleaning may
be thoroughly done. On this cap I place the bearing or pivot for the cowl, the
position of which should be the centre of two imaginary spheres upon which the
upper and lower revolving joints of the cowl should be made as hereafter immediately
described. The cowl is necessarily cylindrical about the two joints, and it has a side
opening for the exit. Its top end forms a loose fit to the fixed cap and a joint
spherically related to the pivot. Its bottom end also forins a loose fitting joint
spherically related to the pivot as in the case of the top joint, the latter joint being
formed about the bell mouth or flange of the base.
Preferably the upper part of the cowl would be of light construction whilst the
lower part would be heavy or even weighted. The object of this peculiar spherical
adjustment of pivot and joint is to allow of a considerable amount of sway or
oscillation without the joints touching and causing noise, friction, and obstruction to
revolution, also that such oscillatory motion will tend to rub off any accumulation
of soot, dirt or corrosion. The object of making the lower part of the cowl heavy is
that its weight as a hanging pendulum will tend to counteract the force of the wind
in upsetting the poise of the cowl and causing noise and friction. And as a still
further precaution against noise or rattle and undue friction during a strong wind I
may add rollers either to the cowl itself or to the base, such rollers being made of
noncorrodible material and covered with some elastic substance as a cushion. With
the same object of preventing friction by the accumulation of soot &c. I prefer the
top of the cowl cylinder to be open with merely a cross bar to carry the pivot. The
pivot may be made cup form so as to hold a lubricant or it may be made with an
inverted cup fixed to the cowl cross bar and resting on a cone point fixed to the cap,
or the cap itself may be pointed for the purpose and the cross bar of the cowl may be
hollowed for the same purpose. In the latter cases a lubricant may not be required,
the wearing parts of the pivot may be made of glass, metal, or any other suitable
material as may be found convenient.
Referring to the drawings.
B. is the cowl base with the flange joints spherically related with the cowl flange
to the pivot either with an actual spherical surface as shown at f. or with a plain
square flange as shewn at f, 1. with or without the spherical surface f, 2.
C. is the pivotted cowl swung on the pivot p. which in its turn is supported by the
cap k. which again is supported by the uprights u. the said upright being made
either as shewn or by extensions of the base cylinder, indeed base, supports, and
cap, may be made in one piece. The top joint may be formed variously as has been
described for the bottom joint.
R. is one of the quieting and antifriction rollers which may be fixed in any
number either on B or on C as may be found most convenient.
W. is the weighted cowl flange made of sufficient substance to counteract the force
of any ordinary side wind.

page_text: Having now described the nature of my Invention and the manner in which it is
to be carried into effect what I claim is
1st. A pivotted-cowl-chimney-top with a clear flue way without cross bar or any
other obstruction so as to allow of efficient cleaning substantially as hereinbefore
described.
2nd. A pivotted-cowl-chimney-top with spherical revolving joints so arranged
that large clearances may be allowed for the vibration or oscillation of the cowl by
the wind in order that the said joint may not rub against the base or flue sub-
stantially as hereinbefore described.
3rd. A pivotted-cowl-chimney-top as above described and in conjunction therewith
a weighted cowl substantially as hereinbefore described.
4th. A pivotted-cowl-chimney-top substantially as above but with friction rollers
secured to the bottom joint either to the flue part of the cowl part substantially as
hereinbefore described.
5th. The general combination of the parts above referred to and substantially as
herein before described.
D
1
HERBERT GUTHRIE,
Albert Road, Levenshulme, Manchester, Agent for the Applicant.