Improvements in or connected with Screw Cutting Dies.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with Screw Cutting Dies.
1, WILLIAM BEARD LAKE, of New Street Works, Braintree, in the County
of Essex, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in or connected with screw cutting dies.
Dies for screw cutting are usually carried in a stock or holder and adjusted by
means of a screw or other suitable device carried by the stock or holder, but such
devices are more or less expensive and the object of the present invention is to
obtain the same result by simpler and less expensive means.
In carrying the invention into effect, a circular or cylindrical die plate is
employed provided with three or there might be more radial slits or openings
extending, with the exception of one, from near the periphery of the plate to the
centre thereof, where they terminate in a central opening at which point the parts
of the die plate are cut to constitute a die.
One of the radial slits or openings is carried completely through the periphery
of the die plate and the natural spring in the die plate or a set imparted thereto
tends to normally separate the parts and enlarge the die, whilst, in order to
regulate the same, an adjusting screw is employed the head of which is received in
a notch formed in the periphery of the die plate and which screw passes through
the split and engages a screw thread at the opposite side thereof by which means
the split die plate may be more or less compressed and the diameter of the die
thereby regulated.
The back of the die plate is formed with an axial depression or recess which, by
reducing the thickness of the acting part of the tool, facilitates the formation of
the cutting edges of the die.
Instead of the regulating screw for compressing the two parts of the plate
together, the die plate may be formed conical or bevelled and a nut or screw cap
formed with a corresponding conical recess may be employed in connection
therewith to compress the device.
In lieu of the means herein before described for compressing the die and thus
regulating the diameter thereof, the split parts of the die plate may be forced
together by giving a set to the die plate or by means of a powerful spring and a
regulating screw may be employed to separate them to the required extent and
thus obtain the necessary adjustment.
Dated this 6th day of November 1895.
VAUGHAN & SON,
Agents for the Applicant.

page_text: TH
Сонцеси WITH DOTOW Outung DIOS.
1, WILLIAM BEARD LAKE, of New Street Works, Braintree, in the County
of Essex, Engineer, 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 said invention relates to improvements in or connected with screw cutting
dies.
Dies for screw cutting are usually carried in a stock or holder and adjusted by
means of a screw or other suitable device carried by the stock or holder, but such
devices are more or less expensive and the object of the present invention is to
obtain the same result by simpler and less expensive means.
In carrying the invention into effect, a circular or cylindrical die plate is
employed provided with three or there might be more radial slits or openings
extending with the exception of one, from near the periphery of the plate to the
centre thereof, where they terminate in a central opening at which point the parts
of the die plate are cut to constitute a die.
One of the radial slits or openings is carried completely through the periphery
of the die plate and the natural spring in the die plate or a set imparted thereto
tends to normally separate the parts and enlarge the die whilst in order to regulate
the same an adjusting screw is employed the head of which is received in a notch
formed in the periphery of the die plate and which screw passes through the split
and engages a screw thread at the opposite side thereof by which means the split
die plate may be more or less compressed and the diameter of the die thereby
regulated.
The back of the die plate is formed with an axial depression or recess which, by
reducing the thickness of the acting part of the tool, facilitates the formation of
the cutting edges of the die.
Instead of the regulating screw for compressing the two parts of the plate
together the die plate may be formed conical or bevelled and a nut or screw cap
formed with a corresponding conical recess may be employed in connection
therewith to compress the device.
In lieu of the means herein before described for compressing the die and thus
regulating the diameter thereof, the split parts of the die plate may be forced
together by giving a set to the die plate or by means of a powerful spring and a
regulating screw may be employed to separate them to the required extent and
thus obtain the necessary adjustment.
And, in order that the said invention may be more clearly understood and readily
carried to effect, I will proceed aided by the accompanying drawings more fully to
describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1. is a plan of a screw cutting die constructed according to the present
invention.
Figure 2. is a side view thereof.
Figure 3. is a transverse section thereof taken on the line 1-1 of Figure 1.
Figure 4. is a similar view to Figure 1. representing a modification in the
regulating means.
Figure 5. is a side view thereof.
'
Figure 6. is a transverse section taken on the line 2-2 of Figure 4, and,
Figures 7. and 8. are plans representing further slight modifications.
In the several figures like parts are indicated by similar letters of reference

page_text: Referring to Figures 1. to 3., a. represents the die plate which is circular in form
and a' represents three, or there might be more, radial slits or openings, formed by
drilling a series of connected holes through the die plate a. and these 'slits or
openings a with the exception of one of them a¹* extend from near the periphery
of the plate a. to the centre thereof where they terminate in a central opening a
at which point the three converging parts a' of the die plate are cut to constitute
a die.
That one a of the radial slits or openings is carried completely through the
periphery of the die plate a. and the natural spring in the die plate or a set
imparted thereto tends to normally separate the parts and enlarge the die a³ whilst
in order to regulate the same an adjusting screw b. is employed the head of which
is received in a notch a formed in the periphery of the die plate and this screw b.
passes through a plain hole in the plate a. adjacent to the catch a' and thence
passes transversely through or across the split a¹* and engages a screw thread a*
at the opposite side thereof.
By these means, that is to say, by turning the screw b. the die plate a. may be
more or less compressed and the diameter of the die a³ thereby regulated.
The back of the die plate a. is formed with an axial depression or recess a®.
which, by reducing the thickness of the acting part of the tool, facilitates the
formation of the cutting edges a³ of the die.
In the example given at Figures 4. to 6., instead of the regulating screw
for compressing the two parts of the plate a. together at the slit a¹ the die plate
is formed at a conical or bevelled and a nut or screw cap b., formed with a corre-
sponding conical recess or internal bevel and provided with a female screw
thread engaging a corresponding male thread as on the plate a., is employed in
connection therewith to compress the device.
In the example given at Figure 7., in lieu of employing extraneous means for
compressing the plate a. and thus regulating the diameter of the die a³, the parts
of the die plate a. adjacent to the slit a¹* may have a set given thereto so as to
normally force them together whilst a regulating screw b. screwing through a
threaded part as of the plate a. and at its end impinging upon the other part of
the die plate adjacent to the slit a* is employed to separate the parts to the
required extent and thus obtain the necessary adjustment.
In the example given at Figure 8., the device is substantially the same as that
lastly hereinbefore described except that in this case the two parts of the die
plate a. are forced together by means of a powerful spring c, secured to the plate a.
by a screw c'.
It will be obvious that the details of construction of the device may otherwise be
more or less varied without departing from the spirit of the invention.
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 screw cutting die, comprising a die plate formed with several slits therein
radiating from a central opening around which the die is formed one of such slits
extending through the periphery of the die plate and means for regulating the
diameter of the central opening and consequently of the die by drawing together
or forcing apart the two parts of the die plate, substantially as herein shown and
described.
2. A screw cutting die, comprising a die plate formed with several slits therein
radiating from a central opening around which the die is formed one of such slits
extending through the periphery of the die plate, the die plate having an inward
or outward set or inclination given thereto and a screw for regulating the diameter
of the central opening and consequently of the die by drawing together or forcing
apart the two parts of the die plate, substantially as herein shown and described.
3. A screw cutting die of the character herein before described formed with an

page_text: axial depression or recess, reducing the thickness of the acting part of the tool and
thus facilitating the formation of the cutting edges of the die, substantially as
herein shown and described.
Dated this 5th day of August 1896.
VAUGHAN & SON,
Agents for the Applicant.