AN IMPROVEMENT IN THE MANUFACTURE OF CHAIN CABLES
Year: 1858

page_text: LETTERS PATENT to Jean Claude Durand, of Pimlico, in the County of
Middlesex, Engineer, for the Invention of "AN IMPROVEMENT IN THE
MANUFACTURE OF CHAIN CABLES."
Sealed the 25th September 1858, and dated the 29th March 1858.
PROVISIONAL SPECIFICATION left by the said Jean Claude Durand at
the Office of the Commissioners of Patents, with his Petition, on the
29th March 1858.
I, JEAN CLAUDE DURAND, of Pimlico, in the County of Middlesex, Engineer,
do hereby declare the nature of the said Invention for "AN IMPROVEMENT IN
THE MANUFACTURE OF CHAIN CABLES," to be as follows:-
This Invention consists in filling up the centre of each link with a block,
solid, or with a space formed or left in the centre thereof. The two ends of
the block are formed with a hollow curve, to correspond to the curve of the
next adjacent links. This filling up of the links adds great strength to the
cable, and prevents any sudden jerks breaking it from a strain being put upon
the cable after its having been loose or comparatively so.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Jean Claude Durand in the Great Seal Patent Office on the
29th September 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JEAN
CLAUDE DURAND, of Pimlico, in the County of Middlesex, Engineer, send
greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-ninth day of March, in the year of our
Lord One thousand eight hundred and fifty-eight, in the twenty-first year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Jean Claude Durand, Her special licence that I, the said Jean
Claude Durand, my executors, administrators, and assigns, or such others as
I, the said Jean Claude Durand, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time and at all
times thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for "AN
IMPROVEMENT IN THE MANUFACTURE OF CHAIN CABLES," upon the condition
(amongst others) that I, the said. Jean Claude Durand, my executors or
administrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the samo was to be performed,
and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Jean Claude Durand, do hereby declare
the nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:-
This Invention consists in filling up the centre of each link with a block
solid, or with a space formed or left in the centre thereof. The two ends of
the block are formed with a hollow curve, to correspond to the curve of the
next adjacent links. This filling up of the links adds great strength to the
cable, and prevents any sudden jerks breaking it from a strain being put upon
the cable after its having been loose or comparatively so.
Having thus described the nature of my Invention, I will proceed more fully
to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
On looking at the Drawing it will be seen that each link is composed of
two principal parts; first, of the ring or link A; second, of the central filling
and strengthening piece B. The ring or link is more or less of an ellipsoidal
form, and is of a circular section. The two curved ends of the ring
or link
are. semicircular, and the diameter of these. semicircles is about and part
greater than the diameter of the section of the link, that is to say, if the

page_text: diameter of the links are, for example, 40, the diameter of the semicircles
should be about 41. The distance between the two sides of the central
portion of the link should be still greater than the diameter of the semicircles
by about the saine amount as the semicircles are greater than the section of
the link, that is to say, that the distance between the interior of the two
sides of the central portion of the link should be about 42mm, so that the
two sides of the links, when supported and kept at their right distance apart
by the brace can never press on the other links which pass between them,
even when the maximum strain is placed on the cable. The filling and
strengthening piece B, in addition to supporting the sides of the link as
beretofore, is formed so as to keep the ends on axes of the links in their
proper position, and prevent them moving away one from the other. For
this purpose the ends of its two sides are formed with a semicircular recess,
as shown, which together with the semicircular ends of the links form circles,
in which the ends or axes of the next link work. In the top and bottom of
the filling and strengthening piece there is a groove in which the sides of the
link lie, and this piece may, when of wrought iron, either be welded to the
sides of the link, or may be left loose, or the filling piece may be of cast iron.
The corners of the filling and strengthening piece may either be made square,
or may be rounded off, as shown by the different dotted lines, the grooves in
the top and bottom of the piece being also more or less deep, as also shewn
by the dotted lines. And in order that the cable may not be too heavy, a
hole f, which may be of greater or less dimensions, is formed in the centre of
each filling and strengthening piece, as shewn in the Drawings.
In witness whereof, I, the said Jean Claude Durand, have hereunto set
my hand and seal, this Twenty-eighth day of September, in the year
of our Lord One thousand eight hundred and fifty-eight.
Witness,
P. HESSE.
J. C. DURAND. (L.S.)