Improvements in Exit Ventilators for Rooms and other Places where Down Draughts" are to be Avoided, and Noiselessness is a Desideratum.
Year: 1887

page_text: Date of Application, 24th Oct., 1887
Complete Specification Left. 24th July, 1888
Complete Specification Accepted, 24th Aug.,
1888
6
Improvements in Exit Ventilators for Rooms and other Places
where Down Draughts" are to be Avoided, and Noiselessness
is a Desideratum.
1, JOHN WALTER GIBBS of South John Street, Liverpool, in the County of
Lancaster, Warming and Ventilating Engineer, do hereby declare the nature of this
invention to be as follows:-
:-
This invention has for its object the improvement of that class of ventilators known
as mica-flap, or room wall exit ventilators, or in other words an exit ventilator from
rooms into chimneys or other exit flues.
The object of my invention is to form these ventilators so that they shall not have
the rattling noise so noticeable in the ordinary mica-flap and other ventilators when
variations of draught occur.
it
I carry out my invention by forming one or both the surfaces, which are liable to
come in contact, of a soft non-inflammable material, which shall, as
cushion
the blow and so obviate the noise.
were,
The substances which I prefer are for the flap itself, asbestos mill-board or card, and
for the back papier-mache or other soft non-inflammable material. I find that the
asbestos card or mill-board will work well simply fastened like an ordinary mica flap
or by means of a link from a staple fixed to the asbestos to another staple fixed in the
perforated frame. The staple in the asbestos is preferably attached by means of
washers and rivetted so that the washers shall hold to the asbestos rather than the
staple. By this means there is little or no chance of the staple pulling out.
can, however, have a washer only on the further side so as to receive the pull.
It
I have also tried the plan of covering the metal back of an ordinary mica ventilator
with asbestos. This answers to a very considerable extent but is more costly and not

page_text: nearly so good as using an asbestos flap on a papier-mache or even a cast iron
backing. The back and the framework can be made precisely the same as that of
ordinary mica-flap ventilators. It is therefore needless to describe it further.
Dated this 22nd October 1887
J. WALTER GIBBS.
Wm. P. Thompson & Co.,
Of 6, Lord Street, Liverpool,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Exit Ventilators for Rooms and other Places
where Down Draughts are to be Avoided, and Noiselessness
is a Desideratum.
I, JOHN WALTER GIBBS, of South John Street, Liverpool, in the County of
Lancaster, Warming and Ventilating Engineer, 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 has for its object, the improvement of that class of ventilators known
as mica-flap, or room wall exit ventilators, or in other words, an exit ventilator from
rooms into chimneys or other exit flues, or openings.
The object of my invention is to form these ventilators so that they shall not have
the rattling noise so noticeable in the ordinary mica-flap and other ventilators when
variations of draught occur.
I carry out my invention by forming one or both the surfaces, which are liable to
come into contact, of a soft non-inflammable material, which shall, as it were, cushion
the blow and so obviate the noise.
In the accompanying drawing,
Figures 1 and 2 are respectively a back view and a transverse section of my improved
ventilator.
In these figures, A is the framework, which is placed across the ventilating entrance
to the flue in such a manner that the valves or flaps B can open inwards.
The substances which I prefer to employ are, for the flap itself, asbestos mill-board
or card, and for the back or framework, papier-maché or other soft, non-inflammable
material or composition. I find that the asbestos card or mill-board will work well
when simply fastened like an ordinary mica-flap, or when secured by means of a link
or links, each passing from a staple fixed to the asbestos, to another staple (2 fixed

page_text: in the framework A. The staples C may be attached to the asbestos by means
of washers, and they may be riveted so that the washers shall hold to the
asbestos rather than the staple. By this means there is little or no chance of the
staple pulling out. Or one member of the staple may be elongated as shown in
the drawings, and a rivet C3 passed through it and the flap, a washer being provided
on the other side of the flap to receive the pull. It is preferable also to "dish the
flaps as shown, in order to give them greater rigidity.
I have also tried the plan of covering the metal back or framework of an ordinary
mica ventilator with asbestos. This answers to a very considerable extent, but is more
costly and not nearly so good as using an asbestos flap on a papier-maché or composi-
tion, or even a cast iron back. The back or framework can be made precisely, the
same as that of ordinary mica-flap ventilators. It is therefore needless to describe it
further.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An exit ventilator for rooms or the like, consisting of a suitable framework A of
papier-maché or similar composition, and of one or more flaps or valves such as B,
suspended on said framework as described, and composed of asbestos card or mill-
board, or of a similar soft non-inflammable material, substantially as and for the
purposes described.
2. The practically noiseless exit ventilator as a whole, constructed substantially as
shown and described.