Improved Centering.
Year: 1894

page_text: Date of Application, 30th Oct., 1894
Complete Specification Left, 7th Aug.. 1895-Accepted, 14th Sept., 1895
PROVISIONAL SPECIFICATION.
Improved Centering.
I, JAMES JOHN NOBBS, of Lime Bank Street, Ashton Old Road, Manchester,
in the County of Lancaster, Miner, do hereby declare the nature of this invention
to be as follows:-
My invention relates to improved centering used in constructing arches and has
for its object to provide means whereby the centering can be moved from place
to place, especially in tunnels and sewers, more readily than centering of ordinary
construction.
According to my invention the centering is made in parts hinged together so as to
allow of the centering being folded to occupy a relatively small space when required
to be moved, suitable fastenings being employed to keep the centering in its open or
working position.
Dated the 30th day of October 1894
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improved Centering.
1, JAMES JOHN NOBBS, of Park Crescent Mews, Park Crescent, Clapham, in
the County of Surrey, formerly of Lime Bank Street, Ashton Old Road, Man-
chester, in the County of Lancaster, Miner, 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 :-
My invention relates to improved centering used in constructing arches and has
for its object to provide means whereby the centering can be moved from place
to place, especially in tunnels and sewers, more readily than centering of ordinary
construction.
According to my invention the centering is made in parts hinged together so as to
allow of the centering being folded to occupy a relatively small space when required
to be moved, suitable fastenings being employed to keep the centering in its open or
working position.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
:―
Figure 1 is a view in perspective of iny improved centering in its open or working
position:
Figure 2 is an end elevation of the centering shewing the same folded:
Figure 3 is a cross section of the centering on the line 3-3 of Figure 1.
a, a are the strips of wooden lagging of which the centering is built up and b, b
the ribs preferably of iron to which the lagging a, a is secured by means of
bolts, which, as shewn in Figures 2 and 3, are countersunk in the lagging a, a
so that the latter present a smooth surface to the brickwork forming the tunnel
or sewer.

page_text: The ribs b, bare each made in two parts and their upper ends are connected together
by means of hinges d.
The centering is maintained in its open or working position by any suitable
means for example by ribs or struts.
Although in the drawing I have represented my improved centering as adapted
for the construction of a cylindrical sewer or tunnel or for a sewer or tunnel with
a semicircular arch it will be obvious that my invention is equally applicable to
centering for tunnels of other shapes for instance egg shape.
It is also obvious that my improved centering can be made in several parts hinged
together instead of in two parts only as shewn in the drawing.
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. A centering formed in parts hinged together, substantially as, and for the
purpose, described.
2. The manufacture and use of the improved centering hereinbefore described and
illustrated in the accompanying drawing.
Dated the 7th day of August 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.