IMPROVE- BAD SADEW CHA OF CHARTING
Year: 1875

page_text: LETTERS PATENT to Samuel Heys Bailey, of Salford, in the County
of Lancaster, Assistant Manager, Ordsall Screw Bolt Works,
Oldfield Road, Salford, aforesaid, for the Invention of "IMPROVE-
BAD SADEW CHA OF CHARTING "
PROVISIONAL SPECIFICATION left by the said Samuel Heys Bailey at
the Office of the Commissioners of Patents, with his Petition, on
the 25th September 1875.
I, SAMUEL HEYS BAILEY, of Salford, in the County of Lancaster,
Assistant Manager, Ordsall Screw Bolt Works, Oldfield Road, Salford,
aforesaid, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR SCREW CUTTING OR CHASING," to be as
follows:-
=
This Invention has for its object improvements in apparatus for screw
cutting or chasing.
I make the dies for use in screw-cutting or chasing machines of
considerable length, and form them with grooves designed to fit upon

page_text: fixed studs in the die box, the dies being held in their places by sot
scrows. Each die as it becomes shorter by wear can be moved inward
from groove to groove. I set up the dies by means of an eccentric stop
plato in the manner at present practised.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Samuel Heys Bailey in the Great Seal Patent
Office on the 22nd March 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
HEYS BAILEY, of Salford, in the County of Lancaster, Assistant
Manager, Ordsall Screw Bolt Works, Oldfield Road, Salford, aforesaid,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of September, in the
year of our Lord One thousand eight hundred and seventy-five, in the
thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Samuel Heys Bailey, Her
special licenco that I, the said Samuel Heys Bailey, my executors,
administrators, and assigns, or such others as I, the said Samuel Heys
Bailey, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-
after 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 Inven-
tion for "IMPROVEMENTS IN APPARATUS FOR SCREW CUTTING OR CHASING,"
upon the condition (amongst others) that I, the said Samuel Heys:
Bailey, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the samo to be
filed in the Great Seal Patent Office within six calendar monthis next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Samuel Heys Bailey, 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

page_text: in and by the following statement thereof, and the Sheet of Drawings
therein referred to (that is to say) :-
•
This Invention has for its object improvements in apparatus for screw
cutting or chasing.
I make the dies for use in screw cutting or chasing machines of
considerable length, and form them with grooves or holes designed to
fit upon fixed studs in the die box, the dies being held in their places by
set screws. Each die as it becomes shorter by wear can be moved
inward from groove or hole to groove or hole, I set up the dies by
means of an eccentric slot plate in the manner shewn in Fig. 4.
Fig. 1 of the Drawings shews in front elevation a screwing or chasing
head embodying my improvements; Fig. 2 is an end elevation, and
Fig. 3 is a plan of the same.
Fig. 4 is a front elevation of the eccentric slot plate.
Figs. 5, 6, and 7 are respectively a front elevation, an end elevation,
and a longitudinal section of one of the die boxes, and Fig. 8 is a longi-
tudinal elevation of one of the dies.
In the chasing head are placed the three die boxes a, each having in
it a longitudinal slot or groove b provided with studs or projections, so
that the die c it contains may be adjusted by means of its grooves or
holes and fixed by means of set screws d.
The radial motion is given to the die boxes as required for adjusting
the positions of the dies in working by means of the plate e, whose
eccentric slots e¹ receive the projections f of the die boxes; g is the plate
whereby the limit of traverse in the slots is determined, according to the
size of bolt required to be chased; h, h, are clip plates placed over the
die boxes for the purpose of preventing their expanding when the set
screws.d are tightened.
It will be seen that the following advantages result from my Inven-
tion: I am enabled to use dies of much greater length than has
heretofore been usual, and consequently by recutting the dies from time
to time as required the same dies may be used for a much longer time
than dies of the constructions hitherto generally employed; the dies and
boxes are very simple, easy to manage and not liable to get out of order;
they are comparatively inexpensive, and any one of the dies can be
taken out to be ground without disturbing the others. Moreover,
when chasing the cutting edges are always exposed to tho workman.

page_text: Having described the nature of my said Invention and explained the
mode of carrying the same into practical effect, I hereby declare that
what I consider to be novel and original, and therefore claim as the
Invention secured to me by the herein-before in part recited Lotters
Patent is, the improved arrangement of apparatus for screw cutting or
chasing herein-before described and shewn in the Drawings, wherein
long dies formed with grooves or holes are used in conjunction with die
boxes capable of radial movement relatively to the axis of rotation of
the body to be operated upon and arranged to be set up by means of a
plate e, the said dies and die boxes being so constructed that each die
can be shifted and refixed in its box to compensate for wear and
recutting as above explained.
In witness whercof, I, the said Samuel Heys Bailey, have hereunto
set my hand and seal, this Twenty-first day of March, in the
year of our Lord One thousand eight hundred and seventy- :
six.