IMPROVEMENTS IN CONCRETE OR OTHER SLABS OR TILES, AND IN THE CONSTRUCTION OF WALLS AND OTHER STRUCTURES COMPOSED IN PART OF THE SAID SLABS OR TILES
Year: 1878

page_text: LETTERS PATENT to Thomas Hindle, of Liverpool, in the County of Lancashire,
for the Invention of "IMPROVEMENTS IN CONCRETE OR OTHER SLABS OR TILES,
AND IN THE CONSTRUCTION OF WALLS AND OTHER STRUCTURES COMPOSED IN
PART OF THE SAID SLABS OR TILES."
Sealed the 16th July 1878, and dated the 18th January 1878.
PROVISIONAL SPECIFICATION left by the said Thomas Hindle at the
Office of the Commissioners of Patents on the 18th January 1878.
THOMAS HINDLE, of Liverpool, in the County of Lancashire. "IMPROVEMENTS IN
CONCRETE OR OTHER SLABS OR TILES, AND IN THE CONSTRUCTION OF WALLS AND
OTHER STRUCTURES COMPOSED IN PART OF THE SAID SLABS OR TILES."
This Invention consists in forming the tiles or slabs with a groove (preferably a
V groove, of rectangular section all round the slab on the edges. These tiles or
slabs are built in two parallel walls, the slabs edge to edge on end. Cement is used
as mortar to hold them together, the cement filling the rectangular prisms formed
by the two grooves meeting. When the two linings are built up & sufficiently
set, the space between is filled in with concrete or other filling. The operation can
take place course by course, or several courses of slabs can be built up, and then
filled in. I prefer however to keep the filling in pretty well up to the last course
of slabs, as this plan entails less chance of damage to the cement work.
These tiles are also useful to face the walls of ordinary buildings after they are
erected. The V grooves are made in the moulds in concrete slabs by means of two
bars, one much longer than the other, fastened at right angles. Two of these are
placed round the mould, and the length can be regulated at pleasure by sliding the
ends of the short bars along the sides of the long ones.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Hindle in the Great Seal Patent Office on the 17th July
1878.
"
THOMAS HINDLE, of Liverpool, in the County of Lancaster. IMPROVEMENTS IN
CONCRETE OR OTHER SLABS OR TILES, AND IN THE CONSTRUCTION OF WALLS AND
OTHER STRUCTURES, COMPOSED IN PART Of the said SlaBS OR TILES."
This Invention consists in forming the tiles or slabs with a groove (preferably a
V groove, of rectangular section all round the slab on the edges. These tiles or
slabs are built in two parallel walls, the slabs edge to edge on end. Cement is
used as mortar to hold them together, the cement filling the rectangular prismis
formed by the two grooves meeting. When the two linings are built up and
sufficiently set, the space between is filled in with concrete or other filling. This
operation can take place course by course, or several courses of slabs can be built up
and then filled in. I prefer however to keep the filling in pretty well up to the
last course of slabs, as this plan entails less chance of damage to the cement work.
These tiles are also useful to face the walls of ordinary buildings after they are
erected. The V grooves are made in the moulds in concrete slabs by means of four
bars, the two forming the groove at the end of the block much shorter than the
other two, and fastened at right angles. Two pairs of these are placed round the
mould, and the length can be regulated at pleasure by sliding the ends of the short
bars along the sides of the long ones.
Figs. one to five represent various forms of building in my principle; Fig. 6,
the bars used in forming the grooves in ordinary slabs or blocks.
Fig. 1 shows a very strong wall with occasional solid blocks as bonds; Figs. 2
and 3, variations.
Fig. 4, curved block for gasometer tank; Fig. 5, blocks instead of slabs, with my
groove.
It will be seen at once that my Invention is applicable for all ordinary styles of
building for retaining walls and the like; also by casting the blocks in the curved
form as in Fig. 4, the Invention is applicable for the building of sewers, arches,
and other curved structures. Indentations can be made to take the place of grooves,
but are more expensive, not as good, and as far as applicable a mere mechanical
equivalent of a groove.
Having now described my Invention, and the best modes known to me of carry-
ing it into effect, I wish it to be understood that I do not claim the principle of
building walls and other structures of slabs or slabs and blocks with a concrete,
filling, but that what I believe to be new, and desire to protect under the herein-
before in part recited Letters Patent is,-
1st. The slab or block with a groove (or series of indentations) on its edges, sub-
stantially as and for the purposes described.
2nd. The construction of concrete structures composed of slabs or blocks with or
without concrete or other filling, but arranged with grooves (or indentations) round
their edges to contain cement or other strong binding material.
In witness whereof, I, the said Thomas Hindle, have hereunto set my hand
and seal, this Sixteenth day of July, in the year of our Lord One thousand
eight hundred and seventy-eight
THOMAS HINDLE. (L.B.)
Witness,
JOHN HAYES,
Apprentice to W. P. Thompson,
Patent Agent and Consulting Engineer,
6, Lord Street,
Livamaal