Improvements in and connected with Chimney and Ventilating Cowls.
Year: 1895

page_text: Date of Application, 30th May, 1895
Complete Specification Left, 29th Feb., 1896-Accepted, 4th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in and connected with Chimney and Ventilating
Cowls.
I, WILLIAM BIRCH, of Highfield, Sheffield, Yorkshire, Caretaker, do hereby
declare the nature of this invention to be as follows:-
This invention relates to revolving cowls and refers to arrangements by which a
current of air can pass into the cowl and over the mouth of the uptake shaft and so
improve the draught. In carrying out this invention the cowl is made to revolve
either in the usual way or on ball bearings or equivalent devices. At the back of
the cowl that faces the wind an opening is made to collect and concentrate the
wind. Connected to the back of the opening is or are a pipe or pipes for the wind
to pass through, which direct a stream or streams of air out of the mouth of the
cowl. Instead of the aforesaid pipes, the inlet opening for the wind may be set
at an angle to deflect the wind upwards: In this arrangement the outlet of the
cowl is made to deflect the draught at an upward angle, and in the previous
arrangement the exit of the cowl may be horizontal. The ball bearings are
preferred to be made as two rings of bars held within a suitable groove or channel
attached to the outside of bottom of cowl, a projecting flange on the top of uptake
comes between the balls and so secures cowl from blowing off and gives a double
ball bearing. Revolving the cowl on ball or other bearings outside the cowl,
enables the chimney to be swept more readily than when the cowl is suspended
upon an inside spindle.
Doted this 30th day of May 1895.
FREDERIC PRINCE,
Agent for Applicant.
Improvements in and connected with Chimney and Ventilating
Cowls.
I, WILLIAM BIRCH, of Highfield, Sheffield, Yorkshire, Caretaker, 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 revolving cowls and refers (a.) to special arrangements
for introducing a current of air into a cowl from the windward side and over the
mouth of the uptake shaft to improve the draught, (b.) to the application of ball
bearings for supporting the cowl. The invention admits of various ways to carry
the same into practical effect. To enable the invention to be properly understood,
I will describe the same with aid of the accompanying drawings, which illustrate
the plans thought the most suitable.
Figure 1. being a sectional elevation of one form of cowl with this invention
applied.
Figure 2. back outside elevation.
T
tinaloida olaration of a modified arrangement.

page_text: Figure 4. back sectional elevation.
Figures 5 & 6. sectional elevations shewing application of ball bearings for the
cowl.
Referring to Fig. 1: the cowl A, is suspended in the usual way to freely revolve
by the wind acting upon the feather B. The back of the cowl has an opening C,
for the wind to enter, which is deflected upwards by the angle back D, as shewn
by arrows E, the arrows F, shewing the line of draught of uptake. In Fig. 3. the
mouth part H, of the cowl is made at right angles to the supporting part J, and is
fitted with an opening K, at back, to which is attached one or more pipes L,
preferably made tapered to concentrate the air passing through to give an increased
velocity to the exit, which greatly assists the draught up the uptake. The pipes L,
are attached to a recessed plate M, let in the back of the cowl. A front shield N,
assists in increasing the pressure of air. Referring to Figures 5 and 6. In this
arrangement the cowl instead of being supported in the usual way is carried on
outside ball bearings O. The balls in Fig. 5, rest on the ledge P, attached to
uptake G, and the cowl on the balls by the circular part Q, attached to cowl, this
art Q, is turned round to come under ledge P, to secure the cowl from being
blown off. In Fig. 6, two ball bearings are used to further reduce friction from
side wind and to better secure cowl. The advantage given by a construction
according to Figures 5 and 6 is to facilitate sweeping.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare what I
claim is
1. A revolving cowl having an opening on back or windward side, to enable the
wind to pass into cowl to assist the draught of the uptake, as described and
illustrated by the accompanying drawings, at Figures 1, 2, 3, and 4.
2. In a revolving cowl, supporting the same or ball bearings substantially as
herein before described and illustrated by the accompanying drawings at Figures 5
and 6.
Dated this 29th day of February 1896.
FREDERIC PRINCE,
37 Cursitor Street, London, Agent for Applicant.