Improvements in Flap Ventilators.
Year: 1891

page_text: Date of Application, 1st July, 1891
Complete Specification Left, 17th Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
Improvements in Flap Ventilators.
I SAMUEL SINCLAIR ROBSON, of Claremont Terrace, Sunderland in the County
of Durham, Wire Rope Manufacturer, do hereby declare the nature of this inven-
tion to be as follows:-
An improvement in material used for flaps to ventilators, of dwelling and other
rooms.
The object of my invention is to produce an improvement in ventilators for
ventilating hospitals, asylums, schools, dwelling and other rooms, to which this
invention may be applicable.
The ventilators, to which my invention applies are those that ventilate buildings,
and dwellings, by means of Hues, in the chimney breasts, chimney shafts, and
ventilating shafts and flues.
The true object of my invention, is to produce a noiseless flap so as to be dis-
tinctly different from those now in use. And for that purpose I abolish in my
ventilators, all mica thin metal or other flaps, covering or guarding, air inlets from
the rooms into the flues.
And I substitute in lieu thereof asbestos sheet paper which is uninflammable, and
noiseless in its action. And fix it to the ventilators, in much the same way as the
mica, and other flaps are now fixed, and used.
And if necessary I may use any suitable stiffening material to prevent the flap
from buckling. And I may use it of special makes, and to any thickness, and in
any number of flaps.
The drawing attached hereto and numbered 1, which is the only drawing I desire
to shew in this application for provisional protection, is a diagram, shewing one of
the class of ventilators to which my invention applies, and the parts A. A are the
flaps referred to, that I will make of the asbestos paper.
And it will be readily seen, that where perfect noiselessness, so very desirable, in
hospitals, studies, and rooms, is required, that my invention meets the desideratum,
as by the use of the asbestos paper, the distressing tinkling and slatting noise of
the present style of ventilator, will be abolished and a silent service substituted
which will be of especial use.
Dated this 30th day of June One thousand eight hundred and ninety-one.
COMPLETE SPECIFICATION.
Improvements in Flap Ventilators.
1, SAMUEL SINCLAIR ROBSON of 13 Claremont Terrace Sunderland, in the
County of Durham, Wire Rope Manufacturer, 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 :-
My invention is to produce a noiseless flap so as to be distinctly different from
those now in use, and for that purpose I abolish in my ventilators, all mica, thin
metal, or other noisy flaps covering or guarding air inlets from the rooms into
the flues.
And I substitute in lieu thereof asbestos paper, which is uninflammable and
noiseless in its action, and I fix it to the ventilators in much the same way as the
mica and other flaps are now fixed and used. And if necessary I may use

page_text: any suitable stiffening material to prevent the thin asbestos paper flap from
buckling.
I may use one or more flaps.
The drawing attached shews a section and a back view of one of the class of
ventilators to which my invention applies, and the flap marked A. A. is the asbestos
paper noiseless flap referred to in the foregoing Specification.
And it will be readily seen that where perfect noiselessness so very desirable in
hospitals, studies, & rooms is required, that my invention meets the desideratum, as
by the use of the asbestos paper, the distressing tinkling and slatting noise of the
present style of ventilator will be abolished, and a silent service substituted which
will be of especial use.
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―
The use of asbestos paper for flaps, such paper being uninflammable and noiseless
in its action, and that its application is substantially as before described.
Dated this 16th day of March 1892.
SAML. S. ROBSON.