Improvements in and relating to Lathe-carriers.
Year: 1895

page_text: Comalada Crani
Date of Application, 5th Nov., 1895
Aux 1908 Accented
5th Sent
1806
Date of Application, 5th Nov., 1895
Complete Specification Loft, 1st Aug.,
4908
Accepted, 5th Sont
1806
PROVISIONAL SPECIFICATION.
Improvements in and relating to Lathe-carriers.
I, WILLIAM PLATTS, of the Firm of George Turton, Platts & Co., Railway
Buffer and Spring Works, Sheffield, in the County of York, do hereby declare the .
nature of this invention to be as follows:-
It has been found in practice that the carriers at present used for driving work
in turning-lathes do not answer the required purpose in a satisfactory manner.
There is frequent slipping when a heavy cut is applied to the work, and this
necessitates a considerable waste of time in replacing and tightening up the carrier,
as well as damaging the work in many cases.
My present invention is designed to obviate this slipping and the consequent
necessity for continual stoppages for tightening up; and by my invention I am
enabled to take a much heavier cut, than is practicable with the old forms of
carrier, and also to do the work in less time, as no time is lost in stoppages for
tightening.
An important feature of my said invention consists in the use of grips or dies of
hard or hardened metal, mounted in the carrier and having serrated or other
suitably formed surfaces for securely holding the work, which grips or dies are
arranged to be pressed forcibly towards each other so as to tightly clamp or grip
When the
the work, by means of one or more set-screws, bolts, wedges or cotters.
work is tightly clamped between the said grips or dies, it is held thereby so
effectually as to prevent it from moving relatively to the carrier even when a heavy
cut is being taken or in the event of a heavy or sudden stress being temporarily
thrown on the carrier.
My said invention, moreover, comprises other improvements hereinafter
mentioned.
In carrying my said invention into practice, according to one method, I provide
a double lathe-carrier having a central opening to receive the grips or dies, and
also, if desired, suitable ways or guides in or upon which the same will slide.
I also provide one or more set-screws in the carrier for pressing the grips or dies
together. The carrier-frame may be made of cast steel, malleable iron or any
other suitable metal. The grips or dies are preferably made of steel and are
hardened after being serrated and fitted to the carrier. The shape of these grips
or dies may be such that the aperture formed between them is either square,
convex, vee, hexagon, octagon, or other suitable shape to suit the material to be
turned; or they may be screw-threaded to suit any size or pitch of screw.
These grips can be made with flanges at one or both sides, or to work in vee or
other shaped guides in the carrier. They can also be made with a socket to receive
the end of the set-screw and these sockets will fit into recesses in the carrier.
One advantage of this form of double carrier or driver is that, no matter where the
driving plate is fixed on the lathe face-plate, no alteration is needed, as it will be
right in any position. When the grips or dies are tightened upon the work, the
teeth of the same have such a powerful hold, that there is no possibility of the work
slipping as in the existing forms of carriers. The grips or dies will, therefore,.
securely hold any shape of work, straight, taper or otherwise. They can also be
arranged to be adjusted by means of wedge-blocks and screws or bolts, or by means
of a cotter or cotters, or by other suitable means.

page_text: These improved carriers are so arranged that the work is perfectly balanced
in the lathe, which is not the case with the old styles of carrier.
The said grips or dies can be applied to the single form of carrier in a similar
manner.
The
In adapting my improved carrier for large work, such as crank-axles and large
shafting, I arrange the grips or dies between two bars or plates which are drawn
together by side pillars or bolts and nuts or in any other suitable manner.
said pillars or bolts can be screwed into one of the said bars or plates or tightly
fitted thereto by means of a feather key to prevent turning of the pillars, or they
are screwed at both ends, or rivetted or secured by any other suitable means.
The said bars or plates are either made integrally with the grips or dies or they
are made separately therefrom; in the latter case the said grips or dies are
. preferably made with grooved sides adapted to slide on the side-pillars or bolts
above mentioned, set-screws being also provided turning in screw-threaded holes in
the said bars or plates to adjust the said grips or dies.
The said bars or driving plates are sometimes combined with adjustable spiral or
other springs fitting in recesses, to take the weight of the driving plates or grips, and
keep them apart while the carrier is being put on or taken off the work, so that
they will not come together and injure the hands of the workmen.
According to another modification of my said invention, I fit hardened steel grips
or dies in existing forms of carriers. Two or any other suitable number of these
dies are dovetailed into the carrier, and the work is pressed down on to them with
a set-screw, thus obviating any liability to slipping.
Dated the 5th day of November 1895.
D. YOUNG & Co.,
11 & 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.
I, WILLIAM PLATTS, of the Firm of George Turton, Platts & Co., Railway
Buffer and Spring Works, Sheffield, in the County of York, 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:-
It has been found in practice that the carriers at present used for driving work
in turning-lathes do not answer the required purpose in a satisfactory manner.
With such carriers, which are usually secured to the work by set-screws bearing
directly against the same, there is frequent slipping when a heavy cut is applied to
the work, and this necessitates a considerable waste of time in replacing and
tightening up the carrier, as well as damaging the work in many cases.
My present invention is designed to obviate this slipping and the consequent
necessity for continual stoppages for tightening up; by my invention therefore I am
enabled to take a much heavier cut than is practicable with the old forms of carrier,
and also to do the work in less time.
An important feature of my said invention consists in the use of dies or grips of
hard or hardened metal, mounted in the carrier and having serrated or other
suitably formed surfaces for securely holding the work, which dies or grips are
arranged to be pressed forcibly against the work, by means of one or more set-
screws, bolts, wedges or cotters, or by other suitable means, so as to tightly clamp
or grip the same. When the work is thus tightly clamped between or by the said
dies or grips, it is so effectually held thereby as to prevent it from moving
relatively to the carrier even when a heavy cut is being taken or in the event of a
heavy or sudden stress being temporarily thrown on the carrier.

page_text: My sand
described.
invention, moreover, comprises other
improvements hereinafter
In the accompanying drawings I have shown how my said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a side elevation of a double lathe-carrier constructed according to my
said invention.
Figure 2 is a side elevation showing another form or modification of my double
lathe-carrier.
Figures 3 to 7 are different views illustrating details of construction.
Figures 8, 9, 10 and 11 are side elevations illustrating other forms or modifica-
tions of my lathe-carrier.
Figure 12 is a plan, partly in section on the line x, x, Figure 11.
Figures 13 and 14 are vertical central sections, and
Figure 15 is a side elevation, illustrating still further modifications of my
invention.
Like letters indicate corresponding parts throughout the drawings.
C
In the double lathe-carrier shown in Figure 1, the frame or body a of the carrier'
is made with driving arms or plates b, b, and with a central opening c in which are
fitted grips or dies d adapted to clamp the work between them. e, e are set-screws
fitting in tapped holes in the frame or body a and bearing against the dies or
grips d respectively, for the purpose of pressing the said dies or grips towards each
other and thus tightly clamping the work between them. The carrier-frame a may
be made of cast steel, malleable iron or other suitable metal. The grips or dies d, d
are preferably made of cast steel and are hardened after being serrated and fitted i
to the carrier. The shape of these grips or dies may be such that the aperture
formed between them is either square, convex, vee, hexagonal, octagonal, taper, or
of other suitable shape for clamping the material to be turned; or they may be
screw-threaded to suit any size or pitch of screw.
In the form or modification of my invention shown in Figure 2, the dies or grips d
are made with lateral grooves d', Figures 3 and 4, so that they may slide on
V-shaped guides o¹ formed on the frame a at opposite sides of the opening c.
Figure 5 shows a portion of a grip or die d having studs or ribs d formed on the
sides thereof and adapted to slide in corresponding grooves formed in the carrier-
frame at opposite sides of the aperture thereof.
I sometimes make each of the grips or dies d, as shown in Figure 6, with a
socket adapted to receive the end of the set-screw e, the body of the carrier
being provided with suitable recesses into which the said sockets will fit when the
grips or dies d are opened out or moved away from each other to the ends of the
opening c.
Figure 7 shows other modifications in the form of the grips or dies for use in
my improved lathe-carrier.
In Figure 8 I have shown another method of tightening the grips or dies d upon
the work. In this arrangement I form one of the said grips d with an inclined'
surface and I provide a correspondingly inclined wedge-piece g, the inclined
surface of which bears against the inclined surface of the said grip d, and which is
arranged to be moved to and fro in the frame a by a screw-threaded bolt h working.
in a tapped hole g' in the wedge-piece 9 and turning in suitable bearings j in the
frame a and having a lock-nut or check-uut h¹ at its outer end. By turning the
bolt in one or the other direction, the wedge-piece g can be moved in the corre-
sponding direction so as to force towards each other or release the dies or grips d.
One or more packing pieces k are also provided to permit of adjusting the balance
of the carrier and of increasing or decreasing the space between the grips for
holding the work. Instead of forming the incline on one of the grips, I sometimes
form it on the frame a as shown in Figure 9, in which case the bearings ; must have
elongated holes to permit the movement of the adjacent grip d to and from the
work as the wedge-piece 9 slides along the incline.
One advantage of the forms of double carrier or driver above described, is that,'

page_text: no matter where the driving pin or plate is fixed on the lathe face-plate, no
alteration is needed, as it will be right in any position. Moreover these improved
carriers are so arranged that the work is perfectly balanced in the lathe, which is
not the case with the old styles of carriers. When the grips or dies are tightened
upon the work, the teeth of the same have such a powerful hold, that there is no
possibility of the work slipping as in the existing forms of carriers. The grips or
dies will, therefore, securely hold any shape of work, straight, taper or otherwise.
It will be found that, in many cases, when using the carriers shown in Figures 1
and 2, that it will only be necessary to adjust one of the set-screws e to fix the
carrier upon any desired piece of work. The dies or grips can also be arranged to
be adjusted by means of a cotter or cotters, or by other suitable means.
Figures 10 to 15 show my improvements applied to different forms of single
carriers. In the form shown in Figure 10, the dies or grips d move in line with the
driving arm 6 and the set-screw e is arranged opposite the said arm.
In Figures 11 and 12 I have shown a further modification of my improved
carrier, which I prefer to employ for large work, such as crank-axles and large
shafting. In this case, the grips or dies d are held between two bars or plates 1,
arranged to be drawn towards each other when necessary by side pillars or bolts m
and nuts m², the bar being provided with a driving arm or plate b. The pillars or
bolts m are fitted into the bar and are kept from turning therein by means of a
feather or key m², and extend through holes formed in the bar . Or the bolts m
can be screwed at both ends, or be rivetted or secured by any other suitable
means.
The grips or dies d are made with grooves d' so that they can slide on the side-
pillars or bolts m, set-screws a being also provided, turning in tapped holes fin
the bars, for the purpose of causing the said grips or dies to tightly clamp
the work.
In the carrier shown in Figure 13, the grips or dies d, instead of being arranged
between separate bars, are so made that the pillars or bolts m can be passed directly
through them and will serve for tightening them upon the work. The lower grip
is in this case provided with a driving arm b.
Figure 14 shows a somewhat similar form of carrier in which the dies or grips d
are shaped so as to reduce the weight thereof to a minimum. In this case the
grips d are provided with lugs n having holes n' for the passage of the bolts m
which are provided with feathers or keys m³ to prevent their turning in the lower
grip. The lugs n are formed with recesses n' in which rest spiral springs p to keep
the grips d apart while the carrier is being put on or taken off the work, so that
they will not come together and injure the hands of the workmen.
According to another modification of my said invention shown in Figure 15,
serrated hardened steel grips or dies d are dovetailed into a carrier-frame a of the
ordinary form, the work being pressed against them by means of a set-screw e, thus
obviating any liability to slipping.
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 :-
First. A lathe-carrier comprising dies or grips of hard or hardened metal and
means for forcibly pressing the same against the work, for the purposes above
specified.
Second. A lathe-carrier comprising grips or dies movable towards and away
from each other in the carrier-frame and means for separately adjusting the said
grips or dies, substantially as, and for the purposes, above specified.
Third. A lathe-carrier comprising a frame consisting of plates or bars connected
and adjustable relatively to each other by means of bolts and nuts or the like, and
hard metal grips or dies attached to or held in the said frame and adapted to
engage with the work, substantially as, and for the purposes, above specified.
Fourth. The modification of the lathe-carrier claimed in the preceding claiming

page_text: clause, in which the grips or dies are made separately from the plates or bars of
the frame, and set-screws are provided for pressing the said grips or dies against
the work, substantially as described.
Fifth. The modification of my invention in which the grips or dies are normally
kept apart by means of spiral or other springs, substantially as, and for the
purposes, above specified.
Sixth. The improved lathe-carrier constructed substantially as described and
shown in either of the Figures 1, 2, 8, 9, 10, 11 and 12, 13, 14 or 15 of the drawings
and operating as, and for the purposes, specified.
Dated this 21at day of I.1 1006
D. YOUNG & Co.,
11 & 12 Southampton Buildings, London, W.C.,
Agents for the Applicant.