Improvement in the Manufacturing of Lamp-posts or Columns
Year: 1890

page_text: Date of Application, 20th Aug., 1890.
Complete Specification Left, 20th May, 1891-Accepted, 20th Aug., 1891
PROVISIONAL SPECIFICATION.
* Improvement in the Manufacturing of Lamp-posts or Columns..
We WILLIAM PITT late of No. 8 Church Road Church Terrace Tottenham
London, N., and now of 9 & 10 Gun Street, in the City of London Brassfinisher
& Ironworker, and HENRY JOHN CARTER and JAMES AYNSLEY of the same
address, General Wood Turners, do hereby declare the nature of this invention to
be as follows:-
Improvement in the manufacturing of lamp-posts or columns by a method of
placing 4 or more lengths of wrought iron in stocks or sand moulds and casting
them together, thereby forming bases and centres of cast iron.
Dated this 19th day of August 1890
-WILLIAM PITT.
COMPLETE SPECIFICATION.
Improvement in the Manufacturing of Lamp-posts or Columns.
We, WILLIAM PITT, late of No. 8 Church Road, Church Terrace, Tottenham,
London, N., and now of 9 and 10 Gun Street in the City of London, Brassfinisher
and Ironworker, and HENRY JOHN CARTER and JAMES AYNSLEY, of the same
address, General Wood Turners, 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 :-
Our improvement in the manufacturing of lamp posts and like columns consists
in building them up from angle iron and other forms of merchants iron arranged
several lengths together symetrically around a centre and united at intervals by
collars of cast iron run upon the bars whilst they are held in suitable moulds.
In the drawing annexed Figure 1 is an elevation of a lamp post made in
accordance with our invention. Figure 2 is a transverse section on the line 2, 2
and Figure 3 is a transverse section on the line 3, 3. Figure 4 shows a modi-
fication. It will be seen that in the lower part of the post or column there are
eight parallel lengths of angle iron symmetrically arranged. There are four large
angle irons a a a a placed together so as to form a square figure as seen in plan
and there are four small angle irons bbbb which cover the joints of the larger
angle irons. To cast on the base c a mould is formed around the ends of the
bars a and b; it may be a sand mould or by preference stocks or metal mould
boxes are employed. In either case the cavities within the bars are filled by
inserting cores of moist loam and these cores are formed with passages through
them to give free vent to the steam which is generated when the molten cast iron
comes into contact with the moist loam. These arrangements are of importance
for in no other way have we been able to confine the molten iron within the mould
and prevent its escape at the interstices or joints between the bars.
In order that the cast iron may unite with the wrought iron bars it is found
advantageous to paint the parts of the bars where union is desired with a thin
paste consisting of borax and finely divided metallic tin.
The upper part of the lamp post shown by Figure 1 is composed of six small
angle irons d d arranged symetrically around a wrought iron tube e. They are
held together by a cast iron collar frun upon them in the manner already
described.
g is another cast iron collar which forms the junction between the lower and
upper parts of the lamp post or column. In casting this junction piece the ends

page_text: of the bars a and b and of the bars d d and tube e are brought together, cores of
moist loam having been previously inserted in the manner already described; the
mould is then formed or closed around them and cast iron is run in.
"
At the top of the lamp post or-column another collar is cast at: h; it is similar
to the collar except that the bars did terminate within it. The tube e extends
up through the collar and carries the upper part of the structure... The several
collars may be cast separately and in succession or simultaneously. We do not in
all cases employ angle iron bars; at Figure 4 a transverse section is shown of part
of a lamp post or column in which four rectangular wrought iron bars are ranged
symetrically around a central wrought iron tube. These parts are combined by
means of collars of cast iron run upon them whilst they are held in moulds 'as
already described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The manufacturing of lamp posts or columns by arranging several lengths of
wrought iron bars approximately parallel and symetrically around a centre and
fastening them together by casting collars upon them at intervals substantially in
the manner herein described.
,1, זית
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WILLIAM PITT:
HENRY J. CARTER.
JAMES
AYNSLEY.