Improvements in Moveable Centerings for Masonry or other Arches Built Between Iron Girders
Year: 1889

page_text: Date of Application, 3rd July, 1889
Complete Specification Left, 3rd Apr., 1890-Accepted, 31st May, 1890
PROVISIONAL SPECIFICATION.
Improvements in Moveable Centerings for Masonry or other Arches
Built Between Iron Girders.
A communication to me from abroad by KARL KRAFFT, of Heilbronn, in the Empire
of Germany, Foreman.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, do hereby declare the nature of this invention to be as follows:-
This invention relates to the masonry arches or vaulting ordinarily built upon and
between the flanges of iron girders for the purpose of forming fireproof floors and
ceilings, and it has for its object an improved moveable centering properly curved,
upon which the masonry arches are built to the required curvature, the centering
being then removed.
Supposing that the invention is to be used where a longitudinal arch, supporting a
flooring above, is to be built upon the lower flanges of two parallel iron flanged
girders of the length of the required floor, slotted metal cramps are used the upper
ends of which are bent over and supported upon the lower flanges of two of the
parallel girders which are to carry the floor.
i
The lower ends of the cramps are preferably directed somewhat inward so that they
point toward the centre of the curve of the arch, and through the slots which are
made through them is passed freely a curved iron bar, which can be held firmly in its
position by means of keys or wedges driven in between its lower edge and the lower
edge of the slots, these keys or wedges being preferably attached to the cramps by
chains to avoid the possibility of their being lost.
A sufficient number of the sets of cramps and curved iron bars are fixed as described
upon the flanges of the girders at suitable distance apart, and upon the upper edges
of the curved bars are laid longitudinal wooden boards or beams of sufficient length,
upon the upper surface of which the masonry arches are built in the usual way,
preferably with the intervention of curved sheets of iron.
The whole forms a very strong and effective centering upon which to build the
arches or vaulting, and it can be readily removed when required by driving out the
keys or wedges, or removing the curved iron bars and cramps, the latter being refixed
to the flanges of the girders in fresh positions as required.
The improved centering described is very simple, cheap, and easily fixed and used,
and by its use the building of masonry, concrete, or other arches or vaulting, upon the
flanges of iron girders, as described, is greatly facilitated.
Agents for
The Appcane
COMPLETE SPECIFICATION.
Improvements in Moveable Centerings for Masonry or other Arches
Built Between Iron Girders.
A communication to me from abroad by KARL KRAFFT, of Heilbronn, in the Empire
of Germany, Foreman.
I, EDMUND EDWARDS, of the firm of Edwards and Co., Patent Agents and
Engineers, of 35, Southampton Buildings, Chancery Lane, in the County of
Middlesex, 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 and accompanying drawing (that is to say):
--
This invention relates to the masonry arches or vaulting ordinarily built upon and

page_text: between the flanges of iron girders for the purpose of forming fireproof floors and
ceilings, and it has for its object an improved moveable centering properly curved,
upon which the masonry arches are built to the required curvature, the centering
being then removed.
In the accompanying drawing which is in illustration of the invention, Figure 1 is
a cross section through an arch with the improved frame or centering applied thereto,
Figure 2 is a longitudinal section through the same, Figure 3 is a view from below,
and figures 4 and 5 are front and side views respectively of the cramp iron with its
key or wedge attached thereto.
Supposing that the invention is to be used where a longitudinal arch, supporting a
flooring above, is to be built upon the lower flanges of two parallel iron flanged
girders A of the length of the required floor, slotted metal cramps B are used the
upper ends of which at C are bent over and supported upon the lower flanges of two
of the parallel girders A which are to carry the floor. The lower ends of the cramps
are preferably directed somewhat inward so that they point toward the centre of the
curve of the arch, and through the slots D which are made through them is passed
freely a curved iron bar E, which can be held firmly in its position by means of keys
or wedges F drawn in between its lower edge and the lower edge of the slots D, these
keys or wedges F being preferably attached to the cramps by chains as shewn to
avoid the possibility of their being lost.
A sufficient number of the sets of cramps B and curved iron bars E are fixed as
described upon the flanges of the girders A at suitable distances apart and upon the
upper edges of the curved bars E are laid longitudinal wooden boards or beams G of
sufficient length, upon the upper surface of which the concrete or masonry arches
are built in the usual way, preferably with the intervention of suitably curved:
sheets of iron H.
The whole forms a very strong and effective centering upon which to build the
arches or vaulting, and it can be readily removed when required by driving out the
keys or wedges F and removing the curved iron bars E and cramps B the latter being
refixed to the flanges of the girder in fresh positions when required.
The improved centering described is very simple, cheap, and easily fixed and used,
and by its use the building of masonry, concrete, or other arches or vaulting, upon
the flanges of iron girders, as described, is greatly facilitated.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
A centering frame for arches built upon iron girders, consisting of the cramps or
supports B, with bent over ends C and slots D through which the curved bar E is
passed and fixed by means of the wedges F, for the purpose of carrying by means of
the intermediate planks G and the plate H, the arch which is to be built, substantially
as described and shewn in the drawing.
Hated
1000
Dated his
April 1000.
EDWARDS & Co.,
35, Southampton Buildings, Chancery Lane, London,
Agents for the Applicant.