IMPROVEMENTS IN SLIDE AND SCREW CUTTING LATHES
Year: 1883

page_text: LETTERS PATENT to Miles Wadsworth of the firm of Jerry Wadsworth and
Son of Ripponden near Halifax in the County of York Machinests for an
Invention of IMPROVEMENTS IN SLIDE AND SCREW CUTTING LATHES
PROVISIONAL SPECIFICATION left by the said Miles Wadsworth at the
Office of the Commissioners of Patents on the 12th April 1883.
MILES WADSWORTH of the firm of Jerry Wadsworth and Son of Ripponden
"IMPROVEMENTS IN SLIDE AND
near Halifax in the County of York Machinists.
SCREW CUTTING LATHES
"
This invention relates to lathes for purposes aforesaid and consists
Firstly. Of an improved construction of the fast head
Secondly. To an improved apparatus for lubricating the tail ends of the spindles.
Thirdly. To an improved construction and arrangement of swing plate and
change wheels for screw cutting.
Fourthly. To a reversible tool box applicable to various shaped tools
Fifthly. To an improved self acting mechanism for stopping and drawing back
the cutting tool.
A fast head for a lathe constructed according to my invention comprises double
or duplicate spindles parallel with each other and so connected and operated by
gear wheels as to rotate in the same direction and at uniform speed the pinion
of the cone is provided with a large flange at its outer end which is received
within a recess formed by the interior of the rim of the large driving wheel
and is secured thereto by means of a pin or holding spring, this arrangement
of gear admits of the use of large relative diameter cone in a head stock of given
size.
The apparatus for lubricating the tail pins or smaller ends of spindles consists
of a box and cover containing oil secured to the adjustable tail pin centre so as to
self-actingly lubricate the smaller ends of the spindles.
The swing plate I mount on the stud of the carrier wheel on which is also
mounted the reversing plate, the change wheels are mounted on two loose studs
adjustable in slot or slots in the said swing plate, and the said studs are of sufficient

page_text: lengths to admit of two or more change wheels on each of them which wheels
gear with the corresponding wheels according to the pitch the screw is to cut by
which arrangement a great saving in the number and size of the change wheels as
heretofore employed is effected. The said swing plate is provided with a holding
bolt and nut working in a radial slot by which the plate and gear can be firmly
secured in position.
The tool box is provided with tool recesses at upper and under surfaces and
such recesses are of various forms to suit the tools of different shapes, the tool box
is reversible so as to bring one or other tool into operation as desirable.
The slide rest of the cutting tool is operated by screw as ordinary in its
advancing motion and is withdrawn from the thread or work by means of lever
mounted on the screw spindle of the transverse slide there being a catch lever and
an adjustable stop carried by a movable bracket, on the latter is a stud carrying
counterbalanced lever on which lever is a stud engaging with a catch lever the
latter being knocked off by means of the carriage when the latter advances the
counterbalance lever then falls, its outer end in falling acts upon the handle of
the ordinary nut box and releases the nut from the screw the movement of the
outer end of the counterbalanced lever carries upwards a hook attached thereto,
the bend of which engages with a runner, as the carriage retreats the runner
moves towards the point of the hook depressing the same, the book being attached
as explained, to the counterbalanced lever draws the latter to its original position
so that the stud and hook engage with each other and are in position to act when
the carriage next advances.

page_text: 12th October 1883.
MILES WADSWORTH of the firm of Jerry Wadsworth and Son of Ripponden
near Halifax in the County of York Machinists "IMPROVEMENTS IN SLIDE AND
SCREW CUTTING LATHES
"
This invention relates to lathes for purposes aforesaid and consists
Firstly. Of an improved construction of the fast head
Secondly. To an improved apparatus for lubricating the tail ends of the spindles
Thirdly. To an improved construction and arrangement of swing plate and
change wheels for screw cutting.
Fourthly. To a reversible tool box applicable to various shaped tools
A fast head for a lathe constructed according to my invention comprises double
or duplicate spindles parallel with each other and so connected and operated by
gear wheels as to rotate in the same direction and at uniform speed, the pinion of
the cone is provided with a large flange at its outer end which is received within
a recess formed by the interior of the rim of the large driving wheel and is secured
thereto by means of a pin holding lever and spring, this arrangement of gear
admits of the use of large relative diameter cone in a head stock of given size.
The apparatus for lubricating the tail pins or smaller ends of spindles (consists
of a box and cover containing oil) secured to the adjustable tail pin centre so as
to self actingly lubricate the smaller ends of the spindles.
The swing plate I mount on the stud of the carrier wheel on which is also
mounted the reversing plate the change wheels are mounted on two or more loose
studs adjustable in slot or slots in the said swing plate and the said studs are of
sufficient lengths to admit of two or more change wheels on each of them which
wheels gear with the corresponding wheels according to the pitch of the screw to
be cut by which arrangement a great saving in the number and size of the change
wheels as heretofore employed is effected the said swing plate is provided with a
holding bolt and nut working in a radial slot by which the plate and gear can be
firmly secured in position.
The tool box is provided with tool recesses at upper and under surfaces and
such recesses are of various forms to suit the tools of different shapes the tool box
is reversible so as to bring one or other tool into operation as desirable.
Such being the nature and object of this my invention in order that the same
may be fully understood I have hereunto annexed 3 sheets of drawings illustrative
thereof in which
DESCRIPTION OF THE DRAWINGS

page_text: received within a recess 10 formed by the interior of the rim 11 of the large
driving wheel 12 and is secured thereto by means of a pin 13 holding lever and
spring 14, this arrangement of gear admits of the use of large relative diameter
cone in a head stock of given size.
The apparatus for lubricating the tail pins 15 or smaller ends of spindles
(consists of a box 16 and cover containing oil) secured to the adjustable tail pin
centre 17 so as to self actingly lubricate the smaller ends of the spindles 18.
The swing plate 19 I mount on the stud 20 of the carrier wheel 21 on which is
also mounted the reversing plate 22 the change wheels are mounted on one or
more loose studs 23 adjustable in slot or slots 24 in the said swing plate and the
said studs 23 are of sufficient lengths to admit of two or more change wheels on
each of them which wheels gear with the corresponding wheels according to the
pitch of the screw to be cut by which arrangement a great saving in the number
and size of the change wheels as heretofore employed is effected the said swing
plate 19 is provided with a holding bolt 25. and nut working in a radial slot 26 by
which the plate and gear can be firmly secured in position.
The tool box 27 is provided with tool recesses 28. 29. at upper and under
surfaces and such recesses are of various forms to suit the tools of different shapes
the tool box is reversible so as to bring one or other tool into operation as desirable.
The tool is held in position by means of plate 30 and bolts 31. 32.
The following Scales No 1 and N° 2 shew my arrangement of wheels for a Lathe
having a leading screw of 2 threads per inch. It will be seen by reference to the
Scales I make use of the same wheels to cut up to 5 threads per inch as on an
ordinary Lathe Scale N° 1 and up to 6 threads per inch Scale N° 2
I dispense with all the Large wheels heretofore used above 40 teeth except one
wheel having 100 teeth and one wheel having 50
For example in cutting a screw having 23 threads per inch on the old system
the following wheels are employed
ALLA
L
To enable the workman to cut according to my system any N° of Threads per
inch above 5 to 10 Scale N° 1 he will have the driven wheel, or the wheel on
the Screw with 50 Teeth-as shewn by Scale it being a convenient N° to work
with.
It will be seen that to cut 6 threads per inch I employ the following
Wheels
20
24
20
50
For 7 threads that being one thread more I substitute
the wheel 24 Teeth with the wheel 28. That is for one thread I increase 4 teeth
up to 10 threads per inch inclusive above 10 threads and up to 20 threads I increase
the driven wheel or the wheel on the Screw to 100 Teeth as shewn by Scale Nº 1
Drivers Driven
20
20
22
100
For 12 threads there being one more
For 11 threads per inch thus
thread I substitute the wheel 24 in place of the wheel 22-That is for every
additional thread I increase 2 teeth up to 20 threads per inch. Above 20 threads
per inch I increase one tooth for every additional thread
Scale N° 2 commencing from 6 threads per inch to 15 threads per inch I increase
the driven wheel 2 teeth per thread. Above 15 to 24 I increase one tooth per
thread or I can have the wheel with the same N° of teeth as the number of threads
required.
For a larger No of threads the example shewn on Scale N° 2 with 48 threads
per inch may be used

page_text: Having thus fully described the nature and particulars of this my said invention
and in what manner the same is to be or may be performed or carried into
practical effect I would have it understood that what I claim is :-
Firstly. The combination of cone 7 with driving wheel 12 lever 14 pin 13 and
gear wheels arranged at one end of the head substantially as described and shewn.
Secondly. The application and use of a locking pin in combination with the
wheel 12 for locking the cone as herein described and shewn.
Thirdly. The application and use in combination with the spindle and tail pin
of lathes of the lubricating box 16 constructed as and for purpose described.
Fourthly. The combination of the slotted swing plate 19 locking pin 25 for
purpose and as herein described and illustrated.
In Witness whereof I the said Miles Wadsworth have hereunto set my hand
and seal this tenth day of October in the Year of our Lord one thousand eight
hundred and eighty three.
Witness
WALTER BRIERLEY
Patent Agent
Halifax Huddersfield & Blackburn
MILES WADSWORTH (L.S.)