thes, and other Machine Tools and Machines.
Year: 1884

page_text: Lathes, and other Machine Tools and Machines.
We HENRY BERNOULLI BARLOW and ARTHUR BERNOULLI BARLOW, of the firm
of H. B. Barlow, Junior, and Company, Manufacturers of Wire Healds and
and Expanding Mandrels, Cornbrook Works, Manchester, Lancashire, do hereby
declare the nature of said Invention for IMPROVEMENTS IN EXPANDING MANDRELS,
APPLICABLE FOR USE IN LATHES, AND OTHER MACHINE TOOLS AND MACHINES, to
be as follows:-
The object of our Invention is to construct a simple expanding mandrel that
may be worked, if desired, unsupported except by the face plate or other part of
the machine to which it is secured; or the mandrel may be run in, or between
centres.
The body of the mandrel consists of a flange and boss made of any metal and
in any convenient manner, as by forging or casting; the back of the flange may
be turned or faced and we prefer to leave a circular projection on such flange to fit
into a corresponding recess in the face plate or other part of a machine; the
projecting boss on the front of the flange is turned taper with the largest diameter
near the flange; a hole is bored through the body of the mandrel and a recess may
be formed in the back of the flange, at the inner end of this hole we cut a screw
thread and form a similar thread on the bolt which fits the hole and has a flanged
head to bear against a die on the taper boss; the shank of the bolt projects beyond
the thread in the body of the mandrel and is firmly secured to a collar which lies in
a recess in the flange; a loose collar is preferably placed on the taper boss near the
flange; three or other number of holes are drilled through the flange opposite to
this collar in each of which is a stud or pin, one end resting opposite the loose collar
and the other against the collar secured to the screwed end of the bolt; a die to
hold the article to be turned is bored to fit on the taper boss, and turned or formed
to the desired size or shape on the outer surface; this die is then divided into two
or more pieces (preferably three) and a lip is or may be left along the divisions of
the die; in some cases we cut the die through in one place only.
To the taper boss of the body of the mandrel we secure a key or keys or
projections which separate the pieces forming the die; springs secured to the keys
or other part of the mandrel hold the die on to the taper boss; or the die may be
held in any convenient manner.

page_text: When the mandrel is fixed upon a machine, work such as a wheel or pulley with
a hole of suitable size is put on the die and by turning the head of the bolt the die
is forced into and secures the wheel; to release the wheel the bolt is turned in the
opposite direction which forces by the fast collar the studs or pins against the loose.
collar on the boss and pushes back the dies toward the small end of the taper boss
thus releasing the wheel or other article.
In a modification of our Invention we form the body of the mandrel as described
and make the split die in two or more pieces with a lip on its inner front end a
groove or recess is cut in the bolt head into which the lip of the die fits; the shank
of the bolt screws into the flange as before; by turning the bolt in one direction
the die is forced up the taper boss and by reversing the motion the bolt withdraws
the die. In place of a loose bolt we prolong the taper boss, reduce its diameter
and cut a screw thread on it, the nut has a groove into which the lip of the die fits
as before described.
The front end of these mandrels may be centre drilled for convenience of using a
back centre support.
The expanding mandrels described may be modified to run between centres by
dispensing with the flange and in some cases we form projections on the large end
of the taper boss for the lathe or other "driver" to bear against.
In a modification we construct a centre mandrel to run in centres by taking a
piece of steel or other metal and turning the main or middle portion taper, the ends
being of smaller diameter, a screw thread is cut.on one end; we cut one or more
(preferably three) deep grooves from end to end of the taper portion, the die is
bored to fit this taper and it may be otherwise finished and split as described; a
stud or pin is laid in each groove; at one end each pin is secured to a collar free to
slide on the plain end of the mandrel, a nut which is screwed upon the other end is
connected in any convenient manner to heads on the pins; by screwing the nut
against the die it forces it along the taper portion of the mandrel and by reversing
the motion the studs or pins draw the loose collar against the other end of the die
and move it back.
The mandrels described may be screwed or otherwise fitted to the spindle of
lathes and other machines.
In order to adapt these mandrels for different sized holes, we change the die or
use split bushes placed on the dies.
This mandrel is particularly adapted for holding screwed nuts while being "faced"
or turned in a lathe; for this work we prefer to use a die with a screw thread cut
on it in one piece, slotted or split from end to end to allow it to be expanded.
Dated this 26th day of November 1884.

page_text: Improvements in Expanding Mandrels, Applicable for Use in
Lathes, and other Machine Tools and Machines.
We HENRY BERNOULLI BARLOW, and ARTHUR BERNOULLI BARLOW of the firm
of H. B. Barlow, Junior, and Company, Manufacturers of Wire Healds and
Expanding Mandrels, Cornbrook Works, Manchester, Lancashire, do hereby
declare the nature of said Invention for IMPROVEMENTS IN EXPANDING MANDRELS
APPLICABLE FOR USE IN LATHES, AND OTHER MACHINE TOOLS AND MACHINES,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
The object of our Invention is to construct a simple expanding mandrel that
may either be worked unsupported except by the face plate or other part of the
machine to which it is secured; or may, if desired run in or between centres.
The body of the mandrel consists of a flange and boss made of any suitable metal
and in any convenient manner, such as by forging or casting. We prefer to turn
or face the back of the flange and to leave a circular projection on such flange to
fit into a corresponding recess in the face plate or other part of a machine. The
projecting boss on the front of the flange is turned taper with the largest diameter
near the flange; a longitudinal hole is bored extending through the body of the
mandrel and the taper boss and a recess is (or may be) formed in the back of the
flange; at the inner end of this hole we cut a screw thread and form a similar
thread on a bolt which screws into the hole and has a flanged head to bear against
a die on the taper boss: the shank of the bolt projects beyond the thread in the
body of the mandrel and is firmly secured to a collar which lies in the recess in the
flange. A loose collar or its equivalent is placed on the taper boss near the flange
and three or other number of holes are drilled through the fange opposite to this
collar, in each of which holes is a stud or pin one end resting opposite the loose
collar and the other against the collar secured to the screwed end of the bolt.
The die to hold the article to be turned is bored to fit on the taper boss and
turned or formed to the desired size or shape on the outer surface; this die is then
divided into two or more pieces (preferably three) and a lip is or may be left along
the divisions of the die.
To the taper boss we secure a key or keys or projections which separate the
pieces forming the die; springs secured to the keys or other part of the mandrel
hold the die on to the taper boss; or the die may be held in any convenient
manner, for instance, the ends of the die may be bevelled and the flange of the
bolt head and the loose collar formed to project over and hold the die in its place.
When the mandrel is fixed upon a machine, work such as a wheel or pulley with
a hole of suitable size is put on the die and by turning the head of the bolt the
die is expanded and forced into the wheel until the latter is firmly secured. To
release the wheel the bolt is turned in the opposite direction and the fast collar on
it forces the studs or pins against the loose collar on the boss thus pushing back
the die toward the small end of the taper boss and releasing the wheel or other
article which can be readily and at once removed as there need be no back centre
support employed for this mandrel.

page_text: In a modification of our Invention we form the body of the mandrel as described
and make the split die with a lip or flange on its inner front end; in the bolt near
the head a recess or groove is cut into which the lip of the die fits; the shank of
the bolt screws into the flange as before.
By turning the bolt in one direction the die is forced up the taper boss and. by
reversing the bolt the die is withdrawn. In place of employing a loose bolt we
may prolong the taper boss, reduce its diameter and cut a screw thread on it for a
nut; this nut has a groove cut in it into which the lip of the die fits as before
described.
The front end of these mandrels may be centre drilled to enable a back centre
support to be used when desired.
The expanding mandrels described may also be modified to run between centres
by dispensing with the flange and in some cases we form projections on the large
end of the taper boss for the "driver" to bear against.
The mandrels described may be screwed or otherwise fitted and secured to the
spindles of lathes and other machines.
In order to adapt these mandrels for different sized holes we may either change
the dies or use split bushes placed on the dies.
In all cases the die may be moved up or down the taper boss of the mandrel by
turning a single nut or bolt.
And in order that our Invention may be fully understood and readily carried
into effect we will describe the accompanying Sheet of Drawings, reference being
bad to the figures and letters marked thereon.
Figure 1 is a sectional view. Fig. 2 a back view. Fig. 3 a section on the line
A B, Fig. 1, with parts removed, of an expanding mandrel made according to our
Invention and Figs. 4, 5, 6 and 7 are detached views of parts of the same. Fig. 8
is a sectional view and Fig. 9 a section on the line C D, Fig. 8 of another form of
expanding mandrel made according to our Invention.
Similar letters refer to similar parts throughout the several views.
In Figs. 1 to 7.-
-a is the flange or main portion of the mandrel with a taper
boss ab is the bolt which screws into the flange a and boss a¹; c is the die,
shown in detailed view Fig. 3 in three separate pieces and bored to fit on the taper
boss a; d is the loose collar with a spring d¹ to bear upon the taper boss and
prevent the collar from turning unnecessarily ; e e e are keys secured in the taper
boss a¹, see Fig. 3; fff are pins fitted into holes a² in the flange a; g is a collar
which screws on to the end of the bolt b and is secured in position by a locking
plate gland screws g², the bolt b which is flattened at b¹ resting in a slot in the
plate g¹. The back of the flange a has a projection a³ turned to fit the lathe or
other machine to which the mandrel is to be secured, and there is also a recess a
to receive the collar g. The taper boss a¹ is bored and screwed, see Fig. 1, for the
bolt b, which is enlarged near the head to cover the end of the boss a¹ and bevelled
or shaped at 62 to bear against one end of the die c, which is held at the other end
by the collar d, retained in its place by the pins f. The die c is prevented from
turning on the boss a¹ by the keys e which come between the three parts of
the die.
When the mandrel is bolted to a lathe or other machine and fitted with dies of
the desired diameter, work such as a pulley or wheel is placed on it and secured in
position by turning the bolt 6 and so forcing the die cup the taper boss a¹, the
loose collar d, pins f and collar g all moving with the bolt b.
To release the wheel, pulley, or other work, the bolt is turned in the reverse
direction so as to cause the pins f to force the die c down the taper boss a¹.
To change the die c the loose collar d is turned on the boss a¹ until the recesses d²
come opposite the pins f, the collar is then free to be moved back and the die can
be readily changed and a larger or smaller die put in its place and secured by
turning the collar into the position shown in Fig. 1.
In Figs. 8 and 9.-The bolt has a flange b2 and a collar 63 between which is a
recess 6. There is an inner flange c¹ formed où the die c which flange c¹ rests in

page_text: the recess 64; the die c is divided into three pieces as shown in Fig. 9, and the
contiguous edges of these three pieces are cut away so as to leave lips c² which are
separated by the keys e, to which are secured springs f, the ends f of which bear
upon the lips c³ and hold the die in its place on the boss a¹.
By turning the bolt 6 in one direction the flange 6' comes against the die and
forces it up the boss a¹ and by reversing the motion the collar 63 bears against the
inner flange c¹ of the die and draws it down the boss.
In place of a bolt the taper boss may be solid and extended and a nut with a
recessed head fitted on the extended end to move the die to and fro.
To change the die the bolt or nut is unscrewed far enough to allow the die to be
removed.
Split bushes may be used on the dies of these mandrels to hold articles with
larger holes.
By the use of these mandrels, wheels and pulleys may be held with their rims
almost or quite in contact with the machine face plate and may be supported by
the mandrel alone without any back centre, thus effecting considerable saving in
the time required to secure the work.
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. The construction, combination, and arrangement of parts forming the improved
expanding mandrel, substantially as and for the purposes herein described and as
illustrated by Figs. 1 to 7.
2. An expanding mandrel in which the die is made without either an internal
or an external flange and is divided into two or more pieces, the said pieces being
held upon a taper boss, and arranged to be moved to and fro by turning a single
bolt, substantially in the manner shown and described with reference to Figs. 1 to 7,
or in an equivalent manner.
3. In an expanding mandrel in which the die is forced up by a bolt and
pushed back by a collar or its equivalent, any arrangement of parts which enables
the die to be changed without necessitating the removal of any other part from the
mandrel.
4. In an expanding mandrel, the combination with a die held on a taper boss
and split or divided in two or more places, of a bolt or nut, by turning which
the said split die may be moved backward or forward on the said taper boss,
substantially in the manner and for the purposes described and as shown in
Figs. 8 and 9.