Year: 1887

page_text: Date of Application, 6th Sept., 1887
Complete Left, 6th June, 1888
Complete Accepted, 13th July, 1888
Oylinders.
I WILLIAM CRAVEN of the Firm of Craven Bros., Limited, of Vauxhall Iron
Works, Osborne Street, Manchester, Engineers, do hereby declare the nature of my
said invention to be as follows :-
:-
The object of this invention is the construction of an improved machine tool or
lathe whereby the operations of boring out and turning of a metal cylinder can be
effected simultaneously, instead of performing such operations separately as
heretofore.
In performing my invention I employ a lathe-bed upon which a pair of head stocks
are mounted each provided with a boss forming the bearing for a face plate and both
of which face-plates are driven simultaneously by pinions upon a shaft running the
length of the bed.
mount the cylinder requiring to be bored and turned between the two face plates
by means of two or more adjustable dogs or clamping brackets provided with suitable
square recesses into which fit studs carrying at their front extremities the clamping
set screws and thus I am able to mount and revolve such cylinder.
At one end of the lathe bed is an extension upon which in slides is mounted a
bracket carrying one extremity of the boring bar and the other extremity of which is
capable of passing through the hollow bosses of the headstocks (and through the
cylinder so mounted between them as aforesaid).
To facilitate the introduction and withdrawal of the boring bar. the sliding bracket
is provided with a traversing screw caused to revolve in either direction by suitable
driving pulleys and which thus traverse the said bracket to and fro upon its bed. The
boring bar once introduced into position is secured from turning by clamping screws
fitted in each of the head-stocks. The boring head is capable of travelling along the
boring bar and for this purpose the latter is provided at opposite sides with a pair of
longitudinal recesses fitted with screws extending through the end of the boring
bar and where they are geared together by spur wheels so as to revolve exactly
simultaneously under the action of the ordinary feed motion.

page_text: And as a ready means of gearing the boring head itself to the pair of traversing
screws so arranged as aforosaid I provide a slot or recess in each side of the said
head into which are inserted nuts which also form the keys for the sliding head.
And in order to turn the outside of the cylinder simultaneously with the boring
out of its interior I employ upon the lathe bed proper a travelling carriage carrying
the usual tools.
It will thus be apparent that by so mounting and revolving the cylinder I am
enabled to bore out the same from end to end and at the same time to turn the
outside except at the extreme ends where the dogs or brackets are situated.
And in order to turn off and face the ends of the cylinder where it is impracticable
to make the cylinder of such length to allow for cutting off the rough ends I support
the cylinder at one end upon the boring head wedging the same fast thereupon by
means of a set of wedging devices-each consisting of a suitable block fitted with a
sliding jaw and which is capable of being forced outwards against the inside or
bore of the cylinder by a screw wedge drawn forward by a nut screwing upon its
front extremity.
These wedging devices being so inserted the outer dogs can be removed (leaving
the cylinder to be driven by the dogs at the opposite end) to allow for finishing the
part which has been covered by the said dogs and which being effected the same
operation is performed at the opposite end of the cylinder.
Dated this 5th day of
Laha 1007
JOHN G. WILSON,
Agent for the Applicant.

page_text: To facilitate the introduction and withdrawal of the boring-bar o-each sliding
bracket m is provided with a traversing screw p caused to revolve in either direction
by suitable driving-pulleys q and q" and which traverse the said brackets with the
boring bar to and fro upon its extension bed k.
When used for boring out of the solid this traversing of the boring-bar is con-
veniently effected by a ratchet-feeding-mechanism consisting of a ratchet wheel B
into which gears a pawl C (see Fig. 5) carried by the oscillating arm D. This arm D
is connected by the rod E to an adjustable crank pin F carried in a slotted disc G.
at one extremity of a shaft H-and which latter is geared at its other extremity by
a spur wheel I to a pinion J upon the side-shaft f. The boring-head s is capable
of travelling along the boring-bar o and for this purpose the latter is provided at
opposite sides with a pair of longitudinal recesses fitted with screws extending
through the end of the boring-bar and where they are geared together by spur-
wheels t so as to revolve exactly simultaneously.
And as a ready means of gearing the boring-heads itself to the pair of traversing
screws so arranged as aforesaid I provide a slot or recess in each side of the said
head into which are inserted half-nuts which also form the keys for the sliding
head in the ordinary manner.
The self-acting ratchet feeding mechanism for traversing the boring_beads will
be seen more clearly in Fig. 5. It consists of an eccentric groove K formed in
the face of the spur-wheel L, which receives revolving motion from the shaft f
through the intermediate spur-wheel M. This groove K communicates an oscillating
motion to one extremity of a lever N mounted upon the stationary stud P and thus
serves to impart at its other extremity a to and fro motion (through a connecting
rod Q) to a ratchet pawl R gearing with a ratchet-wheel S upon one of the boring-
bar traversing-screws,
And in order to turn the outside of the cylinder 9 simultaneously with the boring
out of its interior I employ upon the main lathe bed a one or more travelling
carriages v carrying the usual tools and traversed by the ratchet feeding mechanism T
acting upon the traversing screw U.
It will thus be apparent that by so mounting and revolving the cylinder whilst
the boring-bar remains stationary I am enabled to bore out the said cylinder from
end to end or from both ends and at the same time to turn the outside except at the
extreme ends where the dogs or brackets are situated. And in order to turn off and
face the ends of the cylinder where it is impracticable to make the cylinder of such
length to allow for cutting off the rough ends I support the cylinder at one end upon
the boring-heads, wedging the same fast thereupon by means of a set of wedging
devices illustrated separately in Figs. 7 and 8 and each consisting of a suitable
block V fitted with a sliding-jaw W and which jaw is capable of being forced out-
wards against the inside or bore of the cylinder g by a screw-wedge X drawn forward
by a nut screwing upon its front extremity. These wedging-devices being so
inserted and expanded the outer dogs h can be removed leaving the cylinder to be
driven by the dogs in the face-plate at the opposite end to allow for finishing the
part which has been covered by the said dogs and which when effected can be repeated
at the opposite end of the cylinder.
Although only described in reference to metal cylinders it will be obvious that
solid pieces of metal might be bored out and turned on the outside simultaneously
by this my lathe mechanism and by employing the front extremity or face of the
boring bar for carrying the boring-tools.
Having thus particularly described and ascertained the nature of this my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
:-
1st. The improved combination and arrangement of mechanism for simultaneously
boring out and turning metal cylinders substantially as hereinbefore described and
illustrated on the accompanying drawing.
2nd. In a lathe for turning and boring metal cylinders the employment of a pair

page_text: of face-plates fitted with adjustable clamping dogs for supporting the metal cylinder
at both extremities substantially as and for the purposes herein before described and
illustrated on the accompanying drawing.
3rd. In a lathe for turning and boring metal cylinders the employment of hollow
bead-stocks and means of carrying and actuating the boring-bar and the boring-head
or heads substantially as and for the purposes hereinbefore described and illustrated
on the accompanying drawings.
4th. The improved wedging-devices substantially as and for the purposes herein-
before described and illustrated on the accompanying drawings.