Year: 1897

page_text: I, SAMUEL SIDNEY BROMHEAD, of 171, Queen Victoria Street, in the City and
County of London, England, Patent Agent, (a communication from abroad,) do
hereby declare the nature of this invention to be as follows:-
This invention has for its object to increase the output or capacity for work done
on lathes, more especially of that class known as "turret." lathes, decreasing at the
same time the cost of production.
Briefly, the invention consists in arranging two or more lathes upon a table or
bedplates side by side and fitting them with the devices hereinafter described to
cause the said lathes to work simultaneously.
The general construction of the lathes is unaltered, but devices are added to cause
(1) the headstocks, (2) the tool holders, and (3) the slide rests, which are also
adapted to carry tools, to work together in unison.
Each of the tool holders is adapted to carry a certain number of tools projecting
radially from a central block, which is mounted upon a sliding plate, the under side
of which is provided with grooves which fit corresponding recesses in each of the bed
plates. The sliding plates are connected together by a bridge piece, at or near the
centre of which a socket is formed, through which passes a long lever fulcrummed
on the bed plate of one of the lathes. Thus when the lever is moved by the operator,
when the lathe is being used for boring, the sliding plates and toolholders are
moved by the socketted bridge piece, to which a parallel longitudinal movement is
imparted, thereby causing the tools to approach or recede from the work. Every
back motion of the lever causes the toolholders to make one-sixth of a revolution
by means of suitable pawls or catches fitted to the sliding plates and lathe bed.
The slide rests are similarly connected by a suitable bridge piece, and the tools
mounted in the slide rests are simultaneously caused to approach or recede from the
work by the movement of a lever.
Referring now to the headstocks, the chucks mounted therein are caused to open
and close under the control of a lever handle placed conveniently near the operator.
The movement of this lever handle is transmitted to a pair of link bars centrally
placed between the two headstocks, the movement of each of which operates a
corresponding transverse lever fulcrummed to the lathes. Each of these levers is
provided with an upwardly projecting stud or pin which engages a circumferential
groove formed upon a tightening bush surrounding the corresponding chuck. Thus
when the levers are rocked the pins projecting therefrom cause the bushes surround-
ing the chucks to move, which either tighten or loosen the chuck, thereby regulating
the feed of the work to the tools.
When the chuck is loosened, the work is moved forward through the headstock
automatically by a weight and cord or chain in the usual way.

page_text: It will be seen from the above description that one man is capable of working two or
more lathes by operating devices common to each lathe, thus increasing the capacity
for the manufacture of screws, nipples and the like.
I, SAMUEL SIDNEY BROMHEAD, of 171, Queen Victoria Street, in the City and
County of London, Patent Agent, (a communication from abroad,) 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 has for its object to increase the output or capacity for work done
on lathes, more especially of that class known as "turret " lathes, decreasing at the
same time the cost of production.
Briefly, the invention consists in arranging two or more lathes upon a table or bed-
plate side by side and fitting them with the devices hereinafter described to cause
the said lathes to work simultaneously.
The general construction of the lathes is unaltered but devices are added to cause
1 the headstocks, 2 the tool holders, and 3 the slide rests which are also adapted to
carry tools, to work together in unison.
Each of the tool holders is adapted to carry a certain number of tools projecting
radially from a central block, which is mounted upon a sliding plate, the under side
of which is provided with grooves which fit corresponding recesses in each of the
bed-plates. The sliding plates are connected together by a bridge piece, at or near
the centre of which a socket is formed, through which passes a long lever fulcrummed
on the bed plate of one of the lathes. Thus when the lever is moved by the operator,
when the lathe is being used for boring the sliding plates and tool holders are moved
by the socketted bridge piece, to which a parallel, longitudinal movement is imparted,
thereby causing the tools to approach or recede from the work.
Every back motion of the lever causes the tool holders to make one-sixth of a revo-
lution by means of suitable pawls or catches fitted to the sliding plates and lathe
bed.
The slide rests are similarly connected by a suitable bridge piece, and the tools
mounted in the slide rests are simultaneously caused to approach or recede from the
work by the movement of a lever.
Referring now to the head stocks, the chucks mounted therein are caused to open
and close under the control of a lever handle placed conveniently near the
operator.
The movement of this lever handle is transmitted to a pair of link bars centrally
placed between the two headstocks, the movement of each of which operates a corre-
sponding transverse lever fulcrummed to the lathes. Each of these levers is provided
with an upwardly projecting stud or pin, which engages a circumferential groove
formed upon a tightening bush surrounding the corresponding chuck. Thus, when
the levers are rocked, the pins projecting therefrom cause the bushes surrounding
the chucks to move, which either tighten or loosen the chuck, thereby regulating the
feed of the work to the tools.
When the chuck is loosened, the work is moved forward through the headstock
automatically by a weight and cord or chain in the usual way.
I will now describe the invention with reference to the accompanying drawings,
in which :-

page_text: 1
Fig. 1 shows an elevation of a compound lathe, i.e. two lathes mounted on one bed
plate, constructed according to this invention.
Fig. 2 shows a plan view of Fig. 1; and Fig. 3 a transverse sectional elevation on
the line A-B of Fig. 2.
The two lathes as shown in Figs. 2 and 3 and which are of similar construction are
mounted on a bed-plate T provided with legs or supports G. The lathes are provided
with bed plates W, W¹, on which are fitted the head stocks L, L¹, the slide rests f, f¹
and the grooved channels to receive the sliding plates S, S¹, to permit the longi-
tudinal adjustment of the tool holders t, t¹. The tools not shown, which project
radially from the tool holder and may be of any preferred number, are fixed in the
holes and secured by screwed bolts N.
To cause the tool holders to be adjusted simultaneously they are mounted on
plates S, S¹ which slide in grooves formed in the bed-plates W, W¹, and connected
transversely by a bridge piece q. This bridge piece is caused to slide longitudinally,
thus moving the sliding plates S, S¹ and tool holders by the movement of a lever H.
The lever is fulcrummed at d and at about the middle of its length passes through or
is connected to a socket X firmly attached to the bridge piece q. Thus when the
lever H is rocked, a movement, parallel with the beds of the lathes is imparted to
the tool holders.
To limit the forward movement of the tool holders, they are provided radially with
projecting pins n or the like, the outer end of each of which in turn abuts against
the stops d, d¹.
The slide rests f, and f¹ are also provided with holders e, e¹ to receive parting, mill-
ing and other tools and the like.
To cause the slide rests f, f¹ to work together, they are connected by bridge
pieces b, b and adjusted to and from the work by any suitable arrangement operated
by the lever handle g.
The spindles in the headstocks L, L' are made hollow to allow of the passage of
the material to be worked, and are provided with clamping arrangements which may
be opened or closed by a longitudinal movement of the bushes K, K¹ Fig. 2 in order
to tighten or slacken the chucks Q, Q.
To advance the material D, D simultaneously in both spindles, the bushes K, K¹
are provided with circumferential grooves into which project studs or pins P, P¹.
These pins project from levers r, 1 fulcrummed at x, x. These levers are moved
simultaneously by links m, m¹ by the movement of lever handle h shaft u crank i
and knuckle joint p. The material D, D¹, is fed forward by a cord and weight J
which moves the slides E, E¹ into which the material is fixed towards the head-
stocks.
It will be seen from the above description that one man is capable of working two
or more lathes by operating devices common to each lathe, thus increasing the
capacity for the manufacture of screws, nipples and the like.
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 compound lathe consisting of two or more lathes coupled together in such a
way that the parts thereof are operated simultaneously, as herein described and set
forth.
2. In a compound lathe, the tool holders t, t¹, sliding plates S, S¹, bridge piece q,
socket X and lever H, for operating said tool holders simultaneously, as herein des-
cribed and set forth.
3. In a compound lathe, the lever g, bridge piece or pieces b, b in combination
with slide rests f, f and tool holders e, e¹ mounted thereon, substantially as and for
the purposes herein described and set forth.
4. In a compound lathe, the bushes K, K¹, pins P, P¹, levers r, 71, links m, m¹
knuckle joint p, crank i, shaft u and lever handle h, or their mechanical equivalents,
substantially as, and for the purposes herein described and set forth.

page_text: 5. In a compound lathe, the combination of the matter claimed in the three pre-
ceding Claims Nos. 2, 3 and 4, with slides E, E¹ cords and weights J, J and bed
plate T, substantially as described and for the purposes herein described and set
forth.