IMPROVEMENTS IN THE CONSTRUCTION OF TWIST LACE MACHINES
Year: 1872

page_text: LETTERS PATENT to John Heaselden, of Shelton's Gardens, Old
Radford, nr. Nottingham, Draughtsman, for the Invention of
"IMPROVEMENTS IN THE CONSTRUCTION OF TWIST LACE MACHINES."
Sealed the 28th January 1873, and dated the 11th September 1872.
PROVISIONAL SPECIFICATION left by the said John Heaselden at the
Office of the Commissioners of Patents, with his Petition, on the
11th September 1872.
I, JOHN HEASELDEN, of Shelton's Gardens, Old Radford, near
Nottingham, Draughtsman, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF TWIST LACE MACHINES,"
to be as follows:-
This Invention has for its object improvements in the construction of
twist lace machines.
In order to communicate to the catch bars the motions necessary for
actuating the carriages I connect the foot of the catch bar by a joint, on

page_text: which it is free to turn, to a link which at its other end is jointed to the
arm of the rocking shaft. With this link two other links are combined
so as to form with it a triangle, the free angle of which is connected by
a link with the frame of the machine.
The arrangement is shewn in the annexed Drawing. a is the frame;
b, the combs; c, the carriages; d, the catch bar; d, the joint con-
necting the foot of the catch bar with the link e, which at its other end
is jointed to the arm of the rocking shaft. f, g, and h, are links forming
a triangle with the link e, and i is a link by which the free angle of this
triangle is connected with the frame. Thus it will be seen that I
separate the catch bar movement from the "joint pins" at the ends of
the machine, and substitute independent centres of motion; in this way
space is economised and the working width of the machine is caused to
bear a higher proportion to its extreme width than in machines of the
ordinary construction, greater solidity is also given to the catch bar.
movement.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Heaselden in the Great Seal Patent Office on
the 11th March 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HEASELDEN, of Shelton's Gardens, Old Radford, nr. Nottingham,
Draughtsman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eleventh day of September, in the year of our
Lord One thousand eight hundred and seventy-two, in the thirty-sixth
year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said John Heaselden, Her special license that
I, the said John Heaselden, my executors, administrators, and assigns,
or such others as I, the said John Heaselden, my executors, adminis-
trators, 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 "IMPROVEMENTS IN THE CONSTRUCTION OF

page_text: TWIST LACE MACHINES," upon the condition (amongst others) that I, the
said John Heaselden, 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 same 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 John Heaselden, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say:
-
This Invention has for its object improvements in the construction of
twist lace machines.
In order to communicate to the catch bars the motions necessary for
actuating the carriages I connect the foot of the catch bar by a joint on
which it is free to turn to a link which at its other end is jointed to the
arm of the rocking shaft. With this link two other links are combined
so as to form with it a triangle, the free angle of which is connected by
a link with the frame of the machine.
a is the frame;
The arrangement is shewn in the annexed Drawing.
b, the combs; o, the carriages; d, the catch bar; d', the joint connecting
the foot of the catch bar with the link e, which at its other end is
jointed to the arm of the rocking shaft. f, g, and h, are links forming a
triangle with the link e, and i is a link by which the free angle of this
triangle is connected with the frame. Thus it will be seen that I
separate the catch bar movement from the "joint pins" at the ends of
the machine, and substitute independent centres of motion;
in this way
space is economised and the working width of the machine is caused to
bear a higher proportion to its extreme width than in machines of the
ordinary construction. Greater solidity is also given to the catch bar
movement.
Figure 2 represents the ordinary form of the "brick" or bearing of
the "joint pin," at the end of the machine the flaps marked 1 and 2 are
to carry the comb bars; and the outer flaps 3 and 4 are to carry the
catch bars; these latter I now dispense with.

page_text: What I claim as my improvements in the construction of twist lace
machines, is the arrangement of the catch bars and parts connected
therewith, substantially as described.
In witness whereof, I, the said John Heaselden, have hereunto set
my hand and seal, this Seventh day of March, in the year of our 5
Lord, One thousand eight hundred and seventy-three.
J. HEASELDEN. (L.S.)