Improvements in Ventilating Bricks or Blocks.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Ventilating Bricks or Blocks.
HARRY WILLIAM ROBERTS, Kingston House, Newmarket, Architect, do hereby
declare the nature of this invention to be as follows:-
This invention consists of an air-brick made of terra cotta glazed brick or the
like 9" long by 6" high by 4" wide. On the bottom edge of the front face there
is an opening 6" long by "wide, this opening gradually widens and becomes an
opening 7 by 41" on the back face of airbrick, being over 30 times the area
of inlet. A lining or boxing of wood metal or the like extends from the back
face of airbrick to the inside surface of wall. A piece of wood metal or the like
fits in between airbrick and boxing having an opening about 1 inch less both in
iength and width than the opening on back face, of airbrick forming a lip
which stops the slight draught that would form on the inclined sides of airbrick
and entirely prevents a perceptable draught.
The thin piece of wood can easily be removed so that the airbrick inlet can be
readily cleaned out by sponge or otherwise.
The air enters the room through the boxing 72 times the area of inlet on outer
face of wall.
This principle of inlet can be used in other sizes and materials.
Improvements in Ventilating Bricks or Blocks.
HARRY WILLIAM ROBERTS, Kingston House, Newmarket, Cambridgeshire,
Architect, 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 consists of an air-brick made of metal, stone, brick, terra-cotta
or the like glazed or unglazed built into the wall on the outer face, having
an inlet so constructed that the air passes through an opening first slightly con-
verging then through a diverging opening or tube; on the inner side of the open-
ing is a box formed of zinc copper aluminium or the like having an opening in the
centre of the back, and a plate somewhat larger than the opening fixed on legs
allowing the air to pass through the box into the chamber to be ventilated.
The form of the airbrick greatly diminishes the force of the incoming air and
the back part of the box forming a lip all round again retards the action of
inrush of air.

page_text: I will now more particularly describe the invention with reference to the accom-
panying sheet of drawings.
Figure 1 shews section of the air brickwhich in this case, for facility of
manufacture, is made in two parts A and. B.. built in the brick wall in this case 9"
thick; the contraction of inlet is marked: F, and the metal box shewing on the
inside of opening marked C having an opening at the back marked G, and a plate
marked H, standing at a distance from opening, and fixed to back with 4 sup-
ports or legs marked K, the remaining part of back of box forming a lip,
marked L, all round the opening; which lip breaks up the current of air formed
on the sloping sides. This metal box can be withdrawn, to allow the cleaning
out the brick inlet with a sponge or the like; D, D shews the courses of bricks
above and below the air-brick; E shews the plaster. Figures 2 and 3 shew the
outside and inside view of air-brick. Figure 4 shews the inside view of the
metal box
Having now particularly described and ascertained the the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is:-
1. The general arrangement and combination of parts, comprised in the venti-
lating air-brick, substantionally as hereinbefore described and shewn.
2. A ventilating air-brick constructed from the form of the human mouth in
violent respiration, with small inlet, expanding chamber, contracted again by
the lips.
3. A ventilating inlet of this and varied forms and proportions, that admits
the air first through a converging tube or opening, then through a diverging tube
or opening, and then through a box having a small inlet and larger outlet; the
box being so formed and placed as to form a lip to break up the currents of air
that form on the inside faces of the diverging opening of the air-brick.
Dated this 20th day of July 1900.
HARRY W. ROBERTS,