IMPROVEMENTS IN APPARATUS EMPLOYED IN THE CHUCKING AND CENTERING OF PIPES AND CYLINDRICAL OR PARTLY CYLINDRICAL BODIES
Year: 1879

page_text: LETTERS PATENT to Tom Milburn and Charles William Haydon, of the Firm
of William Milburn and Sons, of Staley-Bridge, in the County of Lancaster,
Iron-founders, for the Invention of "IMPROVEMENTS IN APPARATUS EMPLOYED
IN THE CHUCKING AND CENTERING OF PIPES AND CYLINDRICAL OR PARTLY
CYLINDRICAL BODIES."
Sealed the 23rd January 1880, and dated the 2nd August 1879.
PROVISIONAL SPECIFICATION left by the said Tom Milburn and Charles
William Haydon at the Office of the Commissioners of Patents on the 2nd
August 1879.
TOM MILBURN and CHARLES WILLIAM HAYDON, of the Firm of William Milburn
IM-
and Sons, of Staley-Bridge, in the County of Lancaster, Iron-founders.
PROVEMENTS IN APPARATUS EMPLOYED IN THE CHUCKING AND CENTERING OF
PIPES AND CYLINDRICAL OR PARTLY CYLINDRICAL BODIES."
Our Invention relates principally to the chucking of cast iron pipes, but is also
applicable in cases wherein other hollow metal bodies have to be mounted in lathes.
Our Invention is particularly applicable for use in the turning or facing of the
flanches of pipes. To the face plate or spindle of the fast headstock we fix a
carrier centering chuck, and on the centre of the following headstock we mount
another chuck which also performs centering functions. Each chuck is provided
with three blocks or dies specially prepared for gripping the article, and which are
arranged to slide radially in suitably prepared slots or recesses. The inner ends of
the said blocks or dies are acted upon by a cam which is formed with curved
inclines. The part which carries the said blocks or dies is arranged to revolve upon
or within the part on which the said cam is fixed or formed. When the first named
part is revolved in one direction the blocks or dies are simultaneously forced out-
wards, and when revolved in the other direction the said blocks or dies are drawn
inwards by means of curved grooves which act upon projections on the said blocks
or dies.
When a body, say for example a pipe, is mounted upon the two chucks, and the
blocks or dies are thrust out until they bear against the interior of the pipe, it is
only necessary to turn the chuck on the following headstock in order to tighten the

page_text: hold of the chucks to any required extent, the chucks at the same time centering
the pipe. We so form the said chucks as that the strain of the cut: tends to
tighten the hold of the chucks. The method of mounting the chuck on the following
headstock may be varied. In the arrangement we have adopted we form a centre
for the following beadstock having a cylindrical part upon which the said chuck is
mounted, and a conical shoulder which takes the thrust. In some cases, especially
in the larger sizes of chucks, we employ tightening bolts which take into tee-headed
grooves as means for tightening together the two principal parts of the chuck in
order to prevent the unintentional loosening of the grip of the chucks upon the
pipe or other body, which is especially useful in the case of articles heavier on the
one side than on the other.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Tom Milburn and Charles William Haydon in the Great Seal Patent
Office on the 2nd February 1880.
TOM MILBURN and CHARLES William Haydon, of the Firm of William Milburn
and Sons, of Staley-Bridge, in the County of Lancaster, Ironfounders.
IM-
は
PROVEMENTS IN APPARATUS EMPLOYED IN THE CHUCKING AND CENTERING OF
PIPES AND CYLINDRICAL OR PARTLY CYLINDRICAL BODIES."
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whats and columns,
Our Invention relates principally to the chucking of cast iron,pipes
but is also applicable in cases wherein other hollow metal bodies have to be mounted
in lathes. Our Invention is particularly applicable for use in the turning or facing
of the flanches of pipes. To the face plate or spindle of the fast headstock we fix
a carrier centering chuck, and on the centre of the following headstock. we mount
another centering chuck. Each chuck is provided with three or more blocks; dogs,
'or dies for gripping the article, which blocks are arranged to slide radially in suitably
prepared slots or recesses. The inner ends of the said blocks are acted upon by a
cam which is formed with curved inclines. The part which carries the said blocks
is arranged to revolve upon or within the part on which the said cam is fixed or
formed. When the first named part is revolved in one direction the blocks are
simultaneously forced outwards, and when revolved in the other direction the said
blocks are drawn inwards.by means of curved grooves which act upon projections
on the said blocks. When a body, say for example a pipe; is mounted upon the
two chucks, and the blocks are thrust out until they bear against the interior of
the pipe, it is only necessary.to turn the chuck on the following headstock in order
to tighten the hold of the chucks to any required extent, the chucks at the same
time centering the pipe. We so form the said chucks as that the strain of the cut
tends to tighten the hold of the carrier chuck.
And in order that our Invention may be fully understood we have attached
hereunto a Sheet of Drawings made to a scale of about three fourths the full size
of the example selected, and marked with letters of reference, to which Drawings

page_text: we will now refer. In the said Drawings Fig. 4 represents a side view of the chuck
which we bolt or attach to the face-plate of the lathe; and Fig. 5 is a corresponding
view of the chuck which we mount upon the following headstock; Fig. 3 is a
sectional view of Fig. 4; and Figs. 1 and 2 are face views of the two principal parts
of either of the two chucks. In Figs. 3 and 4, a is a cam-piece which is formed
with a flanch whereby it can be bolted to the face-plate of the lathe. In the
example this cam-piece is formed with a neck of lesser diameter than the part which
enters the pipe or body to be turned, in order that the cutting. tool-may- be
introduced between the face-plate and the said pipe or body, but the form of this
said cam-piece may be varied according to the work for which the chuck is
particularly adapted, and if preferred it may be formed to screw or fix upon the
lathe spindle without the employment of a face-plate. Fig. 1 is a front or face view of
the said cam-piece. In a central position is a projecting cam a on the periphery of
which are formed three curved inclines b, b, b. In the margin of the cam-piece are
cut or formed three curved grooves c, c, c, which are generated from the same centres
as the inclines b, as near as may be. Upon the said cam piece is mounted a part d
which we will call the dog-piece for the sake of distinction. An inner face of this
dog-piece is seen at Fig. 2, wherein the inclines b and c are also indicated by dotted
lines. In this dog piece is turned or formed an annular groove e which is undercut
on one side as seen in Fig. 3. The heads of three hook bolts f. f, f, enter this
undercut groove, and the shanks of the said bolts pass through holes in the cam-
piece and are secured by means of nuts at the back of the cam-piece, as indicated
by dotted lines in Fig. 3; these bolts may be dispensed with in some cases. A stud g
passes through the centre of the dog-piece and is screwed into the centre of the
cam-piece; this stud serves as a centre upon which the dog-piece can be revolved to
some extent. The dog-piece is secured in any position into which it may have
been revolved by tightening the bolts f. The groove e is, formed in an annular
projection which encloses the cam a when the two parts are put together as seen in
Fig. 3. In this projection, and crossing the said groove, are cut or formed three
slots or recesses in which are fitted to slide three blocks, dogs, or dies, h, h, h. The
inner end of each block is suitably formed to bear upon one of the inclines b, and
the outer end is cross cut, or nicked, or otherwise suitably formed or roughened to
take hold of the interior bore of the pipe or body to be chucked. From one edge
of each block a pin or stud i projects and passes into the groove c, as seen in Fig. 3.
When the dog piece is rotated in the direction indicated by the arrow in Fig. 2 the
three blocks are thrust out by the action of the incline b, and when rotated in the
contrary direction the said blocks are drawn inwards by the action of the grooves c
on the pins i. In some cases, especially in the larger sizes of chucks, we form a
heel upon each block or dog as indicated in Fig. 6. The foregoing description
applies also to the chuck represented by Fig. 5, with the exception that instead of
being adapted to be bolted to the face-plate, or to be screwed upon the lathe spindle,
the cam-piece is formed to revolve upon a suitably shaped centre which takes the
place of the ordinary centre in the end of the cylinder of the following headstock.
The form of the centre k is indicated by the dotted lines. The cam-piece a' is bored
and fitted to revolve upon a cylindrical portion of the centre, and the thrust is
received by a conical shoulder turned upon the centre; the form of this centre may
be varied as considered to be desirable. A square or hexagon is formed upon the
cam piece a¹, as indicated, in order that it may be rotated by means of a suitable
key, or other suitable arrangements are made. The manner in which we usually
operate with the apparatus may be described as follows:-The body to be chucked,
say for example a flanched pipe, is brought into position so that the two chucks
enter the opposite ends of the pipe, and the dog piece on the lathe chuck is turned
until the blocks bear against the interior of the pipe. The cam piece on the
following headstock is now rotated, whereby the blocks are thrust out until they
bear forcibly against the interior of the pipe, which will then be turned and will
also turn the dog-piece at the other end, whereby the corresponding blocks are
thrust out. The pipe will now be centred, and the bolts f may be tightened up to

page_text: keep the dog-pieces in position. The turning or facing of the flanches may then be
proceeded with; the chuck on the fast headstock acting as a carrier to. revolve the
pipe, and the chuck on the following headstock revolving on the centre k. The
forms of the blocks or dogs and of the cam and dog pieces may be varied, so long
as the general action of the apparatus is retained.
Having now fully set forth and indicated the nature of the said Invention, and
the manner in which we carry the same into practical effect, we would have it to
be understood in conclusion that we claim,-
First. The apparatus constructed and arranged substantially as and for the
purpose set forth and indicated hereinbefore, and in and by the accompanying
Drawings.
And, Secondly. The centering chucks attached to the lathe spindle and mounted
on a following centre in which chucks; blocks, dogs, or dies are thrust out by means
of curved surfaces, substantially as and for the purpose or purposes set forth and
indicated.
In witness whereof, I, the said Charles William Haydon, for myself and on
behalf of the said Tom Milburn, have hereunto set my hand and seal, this
Thirty-first day of January, in the year of our Lord One thousand eight
hundred and eighty.
Signed, sealed, and delivered
this Thirty-first day of
January, A.D. 1880, in
presence of
EDWARD K. 'DUTTON.
CHARLES WILLIAM HAYDON. (L.S.)
(Agent for the Patentees),
St. Ann's Churchyard,
Manchester.