Serrated Stones or Bricks for Floors, Sills, and Ceilings, or other purposes in Buildings.
Year: 1890

page_text: Date of Application, 6th Dec., 1890-Accepted. 10th Jan., 1891
COMPLETE SPECIFICATION.
Serrated Stones or Bricks for Floors, Sills, and Ceilings, or other
purposes in Buildings.
I, RUDOLPH BÖHME, of Jerusalemer Strasse 64, Berlin S.W. in the Empire of
Germany, 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 relates to bricks, stones &c. formed in a peculiar manner with
serrations, or teeth on two of their sides so that by placing the stones, or bricks con-
secutively a floor, sill, or ceiling, or other part of a building may be formed, which
carries its own weight, without it being necessary to turn an arch.
The invention is shown in the accompanying drawings in which
Figure 1 shows a side elevation of my improved stone or brick.
Figure 2, is a front elevation.
Figure 3, is a perspective view and
Figures 4 & 5 show a floor or ceiling formed with my stones or bricks in section A. B,
and in plan.
These stones or bricks a are made of clay, stone or other suitable material, and have
the form of two truncated wedges placed one above the other so that the sides b. d.
form teeth to afford a horizontal supporting surface from 6 to c.
The two combined wedges forming the brick or stone are of equal length and slope
at the same angle, so that two stones or bricks placed together in a reverse position
fit exactly into each other with their teeth (see Figure 4), as seen from the side (see
Figure 1) these stones or bricks are of rectangular shape.
In using these stones or bricks they are applied so that their teeth enter into each
other, thus preventing any sliding movement of the various stocks or bricks.
My improved stones or bricks are intended mainly for constructions to supplant
arches, but their application is not limited like arches, as nnlike the latter, they do
not exert any sideward pressure on the supporting construction, but their pressure
upon their supporting construction is vertical.
The construction of a floor sill or ceiling with these improved stones or bricks is
shown in Figures 4 & 5.
For the construction of floors sills or ceilings only one kind of these improved
stones is necessary, the layers or rows being alternately laid with the broadside and
narrower side upwards respectively.
The construction is commenced at one main wall and one row or layer after another
is carried from one supporting wall to the other.
When the supporting walls are not higher than the room and a roof or ceiling is to
be laid construction may be commenced upon one of the supporting walls and the
rows or layers may be carried from one main wall to the other; in this case scaffolding
is required.
For cementing the separate stones or bricks, lime, cement or mortar is used.
However mortar is not absolutely necessary, as sufficient adhesion is acquired by the
stoues gripping into one another.
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 :-
Bricks or stones formed by two or more uniform truncated wedges above one
another, their sides sloping at equal angles and which in other dimensions form
rectangular bodies, in such combination with one another the stones or bricks when

page_text: alternately placed in a reverse position form floors sills or ceilings carrying their own
weights and which exert only vertical pressure upon the supporting walls or con-
structions, substantially as described and illustrated.
.
Dated this 6th day of December 1890
FELL & WILDING,
Per R. A. H.,
Agents for the Applicant.