Year: 1899

page_text: We, SOCIETE ANONYME DES ATELIERS DE CONSTRUCTION, FORGES ET FONDERIE
D'HAUTMONT, of Hautmont (Nord), in the Republic of France, Engineers, do
hereby declare the nature of this invention to be as follows:-
This invention relates to lathes and has for its object to provide a lathe in which
two faces of the work may be turned simultaneously so that only half the usual
time is required for the work, apart from that gained in not having to reverse
the work upon the face plate as is necessary in lathes hitherto in use.
According to our invention we substitute for the ordinary face plate a rotary
crown or ring within the hollow or centre aperture of which the work for
turning placed, secured and centred by suitable means. This ring is adapted
to run on a series of rollers which have by preference conical edges and are
arranged around its periphery and mounted on pins arranged to revolve in radially
adjustable bearings. The said work-carrying ring is rotated by toothed gearing
or any
other suitable means from a driving shaft situated in the lower part or at
one side of the machine, and the lathe bed on either side of the ring is adapted for
so that if necessary
the reception of two or more slide rests or tool carriers
several tools may be applied to each face of the work.
In further description of one construction of lathe made in accordance with
our invention the work-carrying ring is provided with teeth around its periphery
and is driven from a pinion arranged at its base and fast upon the driving shaft
which is rotated in any ordinary manner by a stepped pulley and the usual change
gears. The said ring is mounted so as to rotate between adjustable rollers.
arranged around its periphery and carried by two annular plates, the central
aperture of which corresponds with that of the ring which they embrace. Thes>
plates or bearings are mounted upon or form part of the bed of the lathe and the
rollers referred to are recessed to allow free movement of the central toothed
periphery of the ring, the bearing surfaces being arranged at either side thereof
and coned or not as required. The annular plates are coupled together and
suitably spaced apart by distance pieces, which are arranged alternately with
the rollers described and the plates may be provided with a ring of bronze or
like antifriction metal, where the side faces of the rotary ring bear thereon. On

page_text: its inner side the work carrying ring is provided with radially adjustable rods
screwing into the ring and adapted for centering and fixing the work therein.
It is advisable to provide the inner protruding edges of the ring with an angle
iron or plate for preventing chips or the like from the work obtaining access
to the bearing surfaces or gearing of the ring.
The type of slide rest employed is that ordinarily in use and consists of a
support adapted to be slidden on the bed plates which are or may be cast in one
with the annular bearing plates referred to and upon the said sliding support is
mounted a slide to which is connected an intermediate block carrying a second
support, and slides provided with a tool gripping plate or plates. The cutting
tool is fed to the work by a rack or screw in the well known manner.
Apart from the advantages before described, with a lathe constructed in
accordance with our invention, when required the work may be fixed stationary
in the centre of the rotating ring whilst the tools are fixed to the ring by suitably
arranged tool holders and revolve round the work. This arrangement will be
especially useful for certain work which it would be impossible or at least very
difficult to turn in the ordinary manner.
Dated this Twenty-fourth day of April 1899.
J. C. CHAPMAN & Co.,
Agents.
COMPLETE SPECIFICATION.
An Improved Lathe.
We, SOCIETE ANONYME DES ATELIERS DE CONSTRUCTION, FORGES ET FONDERIE
D'HAUTMONT, of Hautmont (Nord), in the Republic of France, Engineers, 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: -
This invention relates to lathes and has for its object to provide a lathe in which
two faces of the work may be turned simultaneously so that only half the usual
time is required for the work, apart from that gained in not having to, reverse
the work upon the face plate as is necessary in lathes hitherto in use.
According to our invention we substitute for the ordinary face plate a rotary.
crown or ring within the hollow or centre aperture of which the work for
turning is placed, secured and centred by suitable means. This ring is adapted
to run on a series of rollers having by preference conical edges and arranged
around its periphery and mounted on pins arranged to revolve in radially adjust-
able bearings. The said work carrying ring is rotated by toothed gearing or any
other suitable means from a driving shaft situated in the lower part or at one side
of the machine, and the lathe bed on either side of the ring is adapted for the
reception of two or more slide rests or tool carriers so that if necessary several
tools may be applied to each face of the work.
In further description we will refer to the accompanying drawings in which
Fig. 1 is a front elevation, Fig. 2 a plan and Fig. 3 a side elevation partly in
section of one construction of lathe made in accordance with our invention. In
these figures we have shown only one slide rest so as to simplify the drawing, but
two or three slide rests would usually be arranged at each side of the ring.
A is the work carrying ring which is provided with teeth A¹ around its periphery
and is driven from a pinion B arranged at its base and fast upon the driving
shaft C which is rotated in any ordinary manner by a stepped pulley D and the
usual change gears, the latter being represented in the drawing by wheels E E

page_text: T'he
respectively in gear with toothed wheels F F¹ removably mounted on an adjust-
able shaft G. The said ring A is mounted so as to rotate between adjustable
rollers Harranged around its periphery and carried by two annular plates J J¹
the central apertures of which correspond with that of the ring which they
embrace. These plates J J¹ are provided with adjustable bearings II for the
rollers and are mounted upon or form part of the bed of the lathe.
rollers H H are recessed to allow free movement of the central toothed periphery
of the ring A and the bearing surfaces h h are arranged at either side thereof
and coned as shown or otherwise as required. The annular plates J J¹ are coupled
together and suitably spaced apart by distance pieces K, which are arranged
alternately with the rollers H H, and the plates J J¹ may be provided with a
ring L of bronze or like antifriction metal where the side faces of the rotary
ring A bear thereon. On its inner side the work carrying ring is provided with
radially adjustable rods M screwing into the ring and adapted for centering
and fixing the work therein, the latter being represented in the drawing by
a carriage wheel X.
It is advisable to provide the inner protruding edges of the ring with an angle
iron or plate (not shown) for preventing chips or the like from the work obtaining
access to the bearing surfaces or gearing of the ring.
The type of slide rest employed is that ordinarily in use and consists of a
support O adapted to be slidden on the bed plates N N¹ which are, or may be
cast in one with the annular bearing plates J J referred to and upon the said
sliding support O is mounted a slide P to which is connected an intermediate
block R carrying a second support S and slides T provided with a tool gripping
plate or plates. The cutting tool is fed to the work by a rack or screw in the
well known manner.
It will be seen that in a lathe constructed as above described the work may
be operated upon from both sides of the ring A and further, when required the
work may be fixed stationary in the centre of the rotating ring A whilst the
tools are fixed to the ring by suitably arranged tool holders and revolve round.
the work. The latter arrangement will be especially useful for certain work
which it would be impossible or at least very difficult to turn in the ordinary
manner.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that
what we claim is: :-
1. In a lathe the use of a work carrying ring suitably driven and having a
rotary motion between rollers which surround it, said ring receiving or holding
the work within its central aperture so that the faces of the work on opposite
sides of the ring can be operated upon simultaneously, the work either rotating
with the ring when the tools are carried by the stationary bed or remaining
stationary when the tools are carried by the ring, substantially as set forth.
2 In a lathe the use of a work carrying ring, suitably mounted and driven
from its periphery and adapted to receive or hold the work in its central aperture,
substantially as and for the purposes set forth.
3. The combination of parts comprising the improved lathe constructed,
arranged and adapted for use and operating substantially as and for the purposes
herein described and as illustrated in the drawings.
Than the tuntioonta
J. C. CHAPMAN & Co.,
Chartered Patent Agents, 70, Chancery Lane, London, W.C.