Improvements in and the Manufacture of Ventilators.
Year: 1891

page_text: Date of Application, 17th Feb., 1891-Accepted, 4th Apr., 1891
COMPLETE SPECIFICATION.
Improvements in and the Manufacture of Ventilators.
I, CHARLES GANNAWAY, of 18, Merryland Street, Govan, in the County of
Lanark, North Britain, Ship Inspector, do hereby declare the nature of this inven-
tion, and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement: -
My invention relates to improvements in and the manufacture of ventilators, and
consists in making the heads of them of polygonal or other equivalent shape,
whereby no working or stretching is required, as is necessary in the case of the
round-headed ventilators presently in use, thus saving a considerable amount of
labour, expense and time. The several sides are cut to the required shape, and
after being bent or turned by the hand or other means to form the necessary mouth
and throat they are soldered, riveted, or welded together, when the head of the
ventilator is complete. It is then connected with the stalk or stem in the usual
manner.
My invention also consists in making the ventilators so that they can be used for
down or up-draught. In this case I provide an inner tube, with one or more inden-
tations, and at or near the top of the stalk or stem of the ventilator I make a
corresponding number of apertures. When a down-draught is required, the aperture
or apertures is or are closed up by the inner tube covering it or them, but when an
up-draught is required, the ventilator is revolved until the indentation or indentations
in the inner tube is or are opposite the aperture in the stalk of the ventilator, when
a space is left whereby the air passes in, thus inducing an up-draught.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings, in the several
figures of which corresponding parts are marked with the same letters of
reference.
Figure 1 is a section showing in hard lines the ventilator used for an up-draught,
and in dotted lines for a down-draught.
Figure 2 is a back view.
Figures 3, and 4 are similar views to Figures 1 and 2, but constructed for a down-
draught only.
Figures 5 and 6 are also similar views of a different form of ventilator.
A is the head of the ventilator which is made up of several pieces cut to the
required shape and bent or turned over to form the requisite mouth and throat, and
then soldered, riveted, or welded together; and B is the stalk or stem to which the
head is secured. C is the inner tube; and D is the indentation made therein; while E.
is the aperture in the stem of the ventilator. When the ventilator is to be used for
a down-draught the aperture is closed, but when it is to be used for an up-draught
the head of the ventilator is revolved until the indentation D is opposite the
aperture E, when a space is left whereby the air is allowed to pass in, (Figures 1
and 2) thus inducing an up-draught.
In order to cover up the mouth of the indentation when the ventilator is used as.
a down-draught I form a lip F in the throat of the ventilator.
By my improvements it will be easily seen that considerable labour, time, and
expense is saved, and no working or stretching is required.
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 :-
1. In the manufacture of ventilators, constructing them of polygonal or other

page_text: equivalent shape, substantially in the manner and for the purposes hereinbefore
described and shown on the accompanying sheet of drawings.
2. In the manufacture of ventilators, constructing them of polygonal or other
equivalent shape, whereby they can be used for a down or up-draught, substantially
in the manner hereinbefore described, and shown on the accompanying sheet of
drawings.
Dated this 16th day of February 1891.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.