Improvements in Apparatus for Turning and Screw Cutting Rods and Shafts.
Year: 1888

page_text: Date of Application, 15th Feb.. 1888
Complete Specification Lelt, 10th Nov., .1888
Complete Specification Accepted, 14th Dec., 1888
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Turning and Screw Cutting Rods
and Shafts.
I, THOMAS HUNT of Gorton Foundry Manchester in the County of Lancaster,
Engineer do hereby declare the nature of this Invention to be as follows:-
The object of my Invention is to provide apparatus whereby any length of rod
or shaft can be turned or screw cut or both without the length being limited by
the size of machine used. With this object I cause the rod or shaft to move
lengthwise and the tool or tools to remain stationary lengthwise during operation.
I make the tool or tools operate on the rod or shaft by causing them or either
of them to have a rotary or revolving motion. The details for mounting the rod
or shaft and feeding it lengthwise and for rotating it or the tool or tools or both
may be greatly varied without departing from the nature of my Invention and
the machine may be provided with tools and operating devices by which the rod
or shaft is acted upon as it moves in one direction only or the said tools and
devices can be arranged to operate upon the rod or shaft both whilst it moves in
one direction and then again whilst it moves back in the reverse direction I will
to more clearly demonstrate the nature of my Invention describe an arrangement
on the latter plan in which the rod or shaft moves lengthwise only and the tool
revolves or the tools revolve but I do not intend thereby to limit myself to the
means which I shall describe of carrying my Invention into effect.
The machine made according to my Invention as aforesaid consists of a head-
stock like that of a lathe but with its spindle hollow for the rod or shaft operated
upon to slide through lengthwise but not to rotate therein. On the face plate of
this hollow spindle there are tools carried in tool slides (there being preferably
four tools and slides) one or more of which tools is or are cutting when the rol
or shaft is moving longitudinally in one direction and the other or others of the
said tools are cutting when the rod or shaft is moving longitudinally in the other
direction. To give the required feed to the tools when operating I connect by
suitable gearing the aforesaid hollow spindle with a screw or with a worm and
Price 8d 1

page_text: worm wheel or several worms and worm wheels situated beneath the headstock or
in other convenient position which gearing can consist of change wheels for the
purpose
of enabling the speed of the screw or worm and worm wheels to be
varied and thus give the required longitudinal movement to the rod or shaft
operated on. To give the said rod or shaft the required longitudinal movement
and prevent it from rotating when being operated upon I secure it to an adjustable
saddle or adjustable saddles which are caused to slide on the bed of the machine
by the aforesaid screw. Or the said rod or shaft may be securely held by being
gripped between wheels which are made to revolve by the worm and worm wheel
or worms and worm wheels and so give longitudinal movement to the said rod
or shaft whilst preventing it from rotating. To steady the rod or shaft whilst
under operation there is a fixed or adjustable bush in the hollow spindle to fit
the rod or shaft and guide it as it passes through the hollow spindle.
'
If the rod or shaft is to be rotated it can be effected by means of gearing
similar to the gearing of a lathe provision being made for the longitudinal
movement of the rod or shaft.
D
11
11
1
1
1000
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C..
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Turning and Screw Cutting Rods
and Shafts.
I THOMAS HUNT of Gorton Foundry Manchester in the County of, Lancaster
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:
The object of my Invention is to provide apparatus whereby any length of rod or
shaft can be turned or screw cut or both without the length of rod or shaft to be
operated upon being limited by the length of the machine.
With this object I cause the rod or shaft to be operated upon to move lengthwise
and the tool or tools which operate thereon to remain stationary lengthwise during
operation. I make the tool or tools operate on the rod or shaft by causing it or them
to have a revolving motion around the rod or shaft upon which they operate. The
details for mounting the rod or shaft and for feeding it lengthwise and for causing
the tool or tools to revolve may be greatly varied without departing from the nature
of my Invention and the machine may be provided with a tool or tools and operating
devices by which the rod or shaft is acted upon as it moves in one direction only or
the said tool or tools and devices can be arranged to operate upon the rod or shaft
both whilst it moves in one direction and then again whilst it moves back in the
reverse direction.
And in order that my said Invention may be fully understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
Figures on the annexed sheets of drawings the same letters of reference indicating
corresponding parts in all the Figures.
I will describe an arrangement in which several tools are arranged to act upon the
rod or shaft, as it moves lengthwise in both directions but it is to be understood as
before stated that one or any convenient number of tools may be used and that it.or
they, may operate upon the rod or shaft as it moves in one direction only if so
desired.
Figure 1 is a longitudinal section (drawn to a smaller scale than the other Figures)
Figure 2 is an end view partly in section and Figure 3 is a transverse section taken
on the line cd of Figure 1) of a machine constructed according to my Invention.
Figure 4 is a longitudinal section of the tool carrier and holders and Figure 5 is a
transverse section through the tool holders. Figure 6 is an end view and Figure 7
is a longitudinal view of one of the slides for gripping the rod or shaft to be
operated upon and Figures 8 and 9 are views at right angles to each other of a
carrier for supporting the projecting end of the rod or shaft when it is of a length to
require such support one or any desired number of these carriers being employed
according to the length of rod or shaft.
a is the bed of the lathe with feet a¹ upon which it is partially supported. a² is the
driving headstock having a hollow spindle a³ for the passage there through of the rod

page_text: or shaft operated upon. a is a face plate secured to the said hollow spindle a³ on
which face plate at are fitted the adjustable slides a carrying the operating tools a².
In the hollow spindle a³ is inserted a bush a of an internal diameter fitting the rod or
shaft operated upon, the object of which bush is to steady the said rod or shaft when
being operated upon by the tools a' therefore there are required various bushes with
holes to fit the diameter of the rod or shaft under operation.
c is the quadrant or swing frame to which are attached the change wheels for
conveying the required various motions or feed, by means of the gear as shown, to
the screw e and consequently to the rod or shaft being operated upon. 61 63 are frames
in which are the gripping slides Z Z by means of which the rod or shaft being
operated upon is carried longitudinally and prevented from rotating. These gripping
slides are for convenience of fitting made in halves (as shewn at line 2 in Figure 1)
bolted together by the bolts 2ª and are adjustable. by the geared right and left hand
screws to any required diameter of rod or shaft. These gripping slides are fitted
with set screws 4 and dies 4ª Figure 2. The object of the former is to grip a rough
or irregular shaft as in the first operation of turning. The object of the latter is to
grip a truly turned shaft while it is being turned or screwed. When the rod or shaft
to be held is uneven the screws 4 are screwed through the dies or bearing pieces 4ª
to come against the said rod or shaft but when the rod or shaft has been turned true
the screws 4 are drawn back within the dies 4ª which are then caused by the
screws 63 and 64 and pieces Z Z to bear on the rod or shaft and hold it in true
central line with the guide bush a. 65 is a rack and 66 is a pinion gearing therewith
and secured to a shaft provided with a cross handle 7 by means of which the gripping
slide frames 16 may be traversed along the bed by hand. cc is the screw for
traversing the said. gripping slide frames 6 along the bed of the lathe which screw
being applied at both ends of the lathe headstock permits of a continuous grip of
the rod or shaft by gripping it by means of the slide just before arrives
near the tools a³ and vice versa the connection and disconnection of the gripping
slides with the screw being made by the disengaging half nuts c² ² which are
engaged and disengaged by the handle y connected to a lever on a spindle²
carrying eccentrics 3 engaging in links connected to the swing arms carrying
the half nuts c³.
The adjustable tool slides a' are adjusted by the screws in the direction parallel
to the axis of the rod or shaft to be operated upon and by the screws V V they are
adjusted in a direction at right angles to the said rod or shaft.
Figures 8 and 9 show the travelling or stationary carriers which may be adjusted
in height (to suit the diameters of rods or shafts to be operated upon) by means of
the nut d and the screw d¹. When used as travelling supports they may run on rails
fixed to the gauge of the wheels d and by means of the nut d the stud d³ is
locked and thus the roller is prevented from rotating and when used as
stationary support the nut d' is slackened so that the stud ³ allows the roller d¹ to
rotate.
a
When the machine is to be put to work the tools a are adjusted to the proper
position for operation and the rod or shaft to be operated upon is fixed in the slide b²
by bringing the parts Z Z together by means of the screws 63 64 and adjusting the
screws to pinch the said rod or shaft. The handle y is then moved so that the half
nuts engage with the screw and the rod or shaft is carried longitudinally between
the tools which revolve around it and act upon it to turn or screw cut it or other-
wise operate upon it. The rod or shaft as it moves longitudinally passes through
the hollow spindle a³ and enters the gripping parts of the sliding frame b¹ which is
caused to pinch it by operating the screws thereof as explained with regard to the
slide 62 (if the rod or shaft be true the dies 4ª are made to bear on the said rod or
shaft instead of the screws 4). The handle y of the said slide 6' is then operated so
that the half nuts e in connection therewith engage with the screw_c. The slide 62
is then released both from the rod or shaft and from the screw and is by means of
the pinion be and rack 6 moved back to its original position. When the slide 6¹ has
nearly reached the limit of its travel the slide 6 is again caused to grip the rod or

page_text: shaft and its half nuts are engaged with the screw c'and the slide is released from
engagement with the rod or shaft and with the screw e and by means of the
pinions and rack 6 it is moved back to its original position and so on until the
whole length of rod or shaft is operated upon when it may be moved back in
the reverse direction and be similarly operated upon as it so moves back. I have
shown two of the tools arranged to operate whilst the rod or shaft travels in one
direction and the other two to operate whilst the rod or shaft moves in the opposite
direction.
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. An apparatus for turning or screw cutting lengths of rods and shafts wherein
the rod or shaft operated upon has a longitudinal movement imparted to it and the
operating tool or tools revolves or revolve around the said rod or shaft substantially
as herein before described.
2. In apparatus for turning or screw cutting rods and shafts a headstock having
a hollow spindle and a tool carrier so arranged that as the rod or shaft is traversed
longitudinally through the said hollow spindle the said rod or shaft is operated upon
by the said tool or tools carried by the said earrier.
3. In apparatus for turning or screw cutting rods and shafts a headstock having
a hollow spindle and a tool holder provided with devices for enabling the tools to be
adjusted in a direction parallel with the length of the rod or shaft and in a direction
at right angles thereto substantially as hereinbefore described.
4. In apparatus for turning or screw cutting rods and shafts a headstock having
a hollow spindle and a tool carrier in combination with a gripping slide or gripping
slides provided with adjustments to accommodate inequalities of the rod or shaft or
to truly hold centrally a turned rod or shaft substantially as hereinbefore described.
5. The arrangement and combination of parts constituting an apparatus for
turning or screw cutting rods or shafts substantially as hereinbefore described and
illustrated by the accompanying drawings whether the supports Figures 8 and 9 be
used therewith or not.
Dated this 10th day of November 1888