Year: 1888

page_text: I CHARLES BROTHERS of 15 Goodge Street London Builder and Decorator do hereby
declare the nature of this invention to be as follows:-
--
The object of this invention is to economise the cost of manufacture of hit-and-miss
ventilators and to increase their efficiency and utility. This I effect by fitting either
the top or bottom plate of the ventilator with two or more pins working in suitable
slots by means of which pins either the top or bottom plate can be moved to and fro
at will as desired.
Another improvement consists in fitting either the top or bottom plate or the frame
of the ventilator with a wire gauze screen or other suitable equivalent so as to prevent
dirt and other impurities passing through the apertures in the ventilator when
open.
Dated this 22nd day of March 1888.
ELT & Co.,
33, Southampton Buildings, Holborn, London,
Agents for the Applicant.

page_text: I CHARLES BROTHERS of 15 Goodge Street London Builder and Decorator 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 to increase the efficiency and utility of hit and miss.
ventilators by preventing the passage of dust, dirt, smuts, and other impurities
through the ventilator when open and also by simplifying the construction of ordinary
hit and miss ventilators to economise the cost of their manufacture.
My invention consists in fitting a panel of wire gauze or perforated zinc, or any
other suitable equivalent between the front and back plates of a hit and miss ventilator.
This panel forms a porous screen through which the air is filtered when the ventilator
is open thus intercepting the particles of dirt, dust, smut and other impurities held in
suspension therein and preventing their passing into the room or other locality where
the ventilator is fitted thereby materially contributing to the sanitary condition of the
surrounding atmosphere. Moreover in the process of filtration through such porous
screen the air is broken up and subdivided into numerous small currents thus reducing
the draught to a minimum and securing.perfect or nearly perfect ventilation without
experiencing discomfort injury or annoyance.
In order to keep the porous panel in position I fit the back plate of the ventilator
with one two or more pins or studs or their equivalents which work to and fro in slots
formed in the face plate of the ventilator. When the ventilator is fitted together the
shanks of such pins or studs or their equivalents pass through suitable holes or
apertures formed in the porous panel and project through the slots in the face plate.
Suitable knobs are then screwed or otherwise fastened on such projecting ends thus
securing the face and back plates of the ventilator together and holding the porous
panel in position between them. These pins or studs or their equivalents form a
convenient means for manipulating the ventilator as by operating them to and fro
the ventilator is opened or closed as required. If desired or found more convenient
the pins or studs may be fixed on the face plate and the slots wherein they work be
formed in the back plate of the ventilator.
This improved method of fitting hit and miss ventilators together by means of screw
pins or studs or screws and nuts and slots will be found to effect a considerable
economy in the manufacture of such ventilators as it dispenses with all necessity for
the grooved and rebated frame and boxing at the back as now used.
I wish however to particularly point out that the perforated panel or screen plate
hereinbefore described equally applicable to all kinds of hit and miss ventilators as
at present constructed whether made of metal, glass, wood, or any other material and
whether revolving or sliding to and fro on runners or operating in any other well
known manner and that this feature of my invention may be readily adapted to all
existing hit and miss ventilators.

page_text: In the accompanying drawings similar letters of reference indicate corresponding
parts Fig. 1 shews a view in plan of the face plate of a hit and miss ventilator made
according to my invention without a frame and having slots a formed therein as
liereinbefore described Fig. 2 shews a similar view of the back plate of a hit and miss
ventilator made according to my invention with apertures therein to receive the
screw pins or studs c that fasten the front and back plates of the ventilator together
Fig. 3 shews a detail view of one of such screw pins or studs c Fig. 4 shews a plan
view of the perforated panel d which is fitted between such plates to intercept dust
dirt and other impurities and prevent them from entering the apartment. Fig. 5
shews a view in front elevation of the ventilator when fitted together complete. Fig. 6
is an end elevation thereof shewing the way in which the screw studs or pins fasten
the front and back plates of the ventilator together. The base of the pin or stud or
its equivalent may be countersunk in the plate so as not to present any projection if
desired. The remaining figures shew the adaptation of my perforated screen plate to
existing ventilators Figs. 7 7 shew views in plan and section of an ordinary hit
and miss ventilator having such screen plate fitted thereto Figs. 8 8ª and 9.9" shew
similar views of glass hit and miss ventilators fitted therewith.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1° Fitting a hit and miss ventilator of any description and construction with a
perforated panel or screen made of wire gauze, perforated zine or of any other suitable
material or substance substantially in the manner and for the purposes hereinbefore
described and shewn.
20 Fitting the front and back plates of a hit and miss ventilator together by means
of pins or studs or screws and nuts or any other equivalent device working to and fro
in suitable slots formed in one of the plates of the ventilator all substantially in the
manner and for the purposes hereinbefore described and shewn.
1000