Improvements in Cowls for Chimneys and Ventilating Shafts.
Year: 1885

page_text: Improvements in Cowls for Chimneys and Ventilating Shafts. .
I WILLIAM GORDON of 125 High Street in the city and county of Edinburgh
Tinplate Worker do hereby declare the nature of my Invention for IMPROVEMENTS
IN COWLS FOR CHIMNEYS AND VENTILATING SHAFTS to be as follows:-
·
The object of my invention is to provide simple and effective means for
preventing the accidental removal by the wind of the rotating hoods or cowls
usually fitted on ventilators for chimneys or ventilating shafts, also to overcome
the cominon fault of chimney sweeps neglecting to fix revolving portion of ordinary
cowls, the above cowl being self fixing.
To that end I provide the rotating cowl with a central stem or spindle which
I fit into a central tube secured by a framing on the stationary part of the chimney
can or shaft, the upper end of the tube forming by preference an oil can or
receptacle for lubricant. On the upper end of the central stem I fit a disc and
on the stationary frame I secure a spring catch which fits over the disc when in
place and prevents the accidental withdrawl of the stem or of the cowl of which
the stem forms a part.

page_text: I, WILLIAM GORDON of 125 High Street, in the city and county of Edinburgh,
Tinplate Worker, do hereby declare the nature of my said invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:—
The object of my invention is to provide simple and effective means for
preventing the accidental removal by the wind of the rotating part of hoods or
cowls usually fitted on ventilators for chimneys, or ventilating shafts; also to
remove the common fault of chimney sweepers neglecting to fix the revolving
portion of ordinary cowls; the above cowl being self acting.
And in order that the nature and novelty of my invention, and the manner in
which it is carried into effect or practice may be properly understood, I have
hereunto appended an explanatory Sheet of Drawings, in which Figure 1 represents
a sectional elevation, and Figure 2 a plan, half of it being in irregular section to
show the improved fittings of a ventilating cowl A, fitted with my improvements
for preventing the revolving part A being removed or blown away by the wind,
from the stationary part C.
Referring to these Drawings my said invention or improvements consist in
providing the rotating part A of the cowl with a central stem or spindle A which
I fit into a central tube c' secured by a horizontal central bar and framing c¹, cll,
on the stationary part C of the cowl or chimney shaft, the lower end of the spindle
resting on a glass or other bearing piece c*.
The vertical angled rods or stays cl are riveted or secured to the stationary
central bar c¹ and their upper ends are bent in to form a horizontal bearing plate,
through which the central tube c passes to support a cylindrical hollow case B, to
by preference form with the upper end or part of the tube an oil can or receptacle
for glycerine, oil, or other liquid to lubricate the spindle A¹ through the apertures b.
On the upper part or end of the central stem or spindle A¹, I form or secure a
disc A² and on the stationary angled frame c¹ I rivet or secure at a¹ the lower end
of a spring catch a. This spring catch projects up through a guiding slot or hollow
bracket a² formed on lubricating case B, and has its upper end bent to project
outwards, preferably made, in cross section, in the form of a triangle with rounded
corners to fit or project over the dise A* when in place and prevent the accidental
withdrawal or removal by the pressure of the wind of the stem A' or of the cowl A
of which the stem forms a part. One of the wind vanes of the revolving cowl A
has a piece in the centre A³ hinged or jointed with a pin in one of the joints, for
opening up or removal to get access to the catch a for removing the revolving
part A of the cowl when the chimney or cowl requires cleaning or sweeping.
Instead of the spring catch a shown any other equivalent catch or stopper,
such as a horizontal swivelling or sliding bar or plate may be fitted or attached to
the stationary parts of the cowl, to project over the disc A' and prevent the
rotating spindle and cowl being removed or carried away by the pressure of the
wind.

page_text: Or by an equivalent arrangement the disc or ring might be formed on the hollow
tube or other stationary part of the cowl and have the spring or sliding catch on
an arm or disc on the rotating spindle of the cowl projecting under the disc or
ring and so retain the cowl essentially in an equivalent manner to having the
catch on the stationary part of the cowl.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
First. The improvements in cowls for chimneys and ventilating shafts for
retaining and preventing the rotating hoods being removed or carried away by
wind pressure substantially as herein described in reference to and shown in the
accompanying Drawings.
Second. In cowls for chimneys and ventilating shafts, the fittings to the stationary
and revolving parts of a spring catch and disc or their equivalents, for retaining
and preventing the rotating spindle and hood being removed by wind pressure,
substantially as herein described.