Improvements in the Manufacture of Bobbins.
Year: 1889

page_text: Date of Application, 20th Apr., 1889
Complete Specification Left, 24th May, 1889-Accepted, 15th Feb., 1890
a
PROVISIONAL SPECIFICATION.
[Communicated from abroad by Messrs. ADT BROTHERS, of Enshein, Germany.]
Improvements in the Manufacture of Bobbins.
I, FREDERICK JOHN BROUGHAM, of 46, Lincoln's Inn Fields, in the County of
Middlesex, Managing Clerk, do hereby declare the nature of this invention to be as
follows:-
Bobbins made of compressed paper offer in comparison with wooden bobbins
great advantages but it is more difficult to repair them than the wooden ones.
Although these bobbins do not need repairing very often it has been found neces-
sary to construct the bobbins in such a manner that it is possible to replace, easily and
rapidly, a head of the bobbin when broken.
A construction similar to that of the ordinary wooden bobbin cannot be employed
as paper and wood cannot be connected together by means of simple glue so as to
offer the required strength. It is therefore necessary to fix the paper by other means
to the wooden part.
In the specification of prior Letters Patent No. 1681 of A.D. 1881 there are
described means for fixing the paper to the wooden parts of the bobbin. According
to the present invention the connection is effected in the several ways hereinafter
described.
As shown in Fig. 1 of the accompanying drawings the stein or shaft of the bobbin
is composed of the paper tube a and the wooden barrel 6. As in the former specifi-
cation herein before referred to the tube a is made from paper or thin paste-board, which
is suitably cut to the required length and rolled; the barrel b is made from wood by
means of suitable machinery.
The barrels coated with an adhesive substance are first forced into the tube by
means of a mechanical device in such a manner that they occupy the place corre-
sponding to the required length of the bobbin. These pieces provisionally arranged
in the manner described are then placed into a mould mounted on a machine.
Suitable rubbers advance while rotating from both sides towards the projecting ends
of the tube and turn them over upon the shoulders e so that the barrels b are firmly
connected with the tube a. The hereinafter described constructions have for their
object to secure in a solid manner, the heads to the shaft or stem composed of tube
and barrel.
Construction I. This construction is illustrated in Fig. 2 and the bobbin consists of
the heads 6 and the shaft a above described. To fix these parts firmly together the
interior of the heads and the exterior of the shaft are threaded.
Construction II. This construction is shown in Fig. 3. The bobbin comprises the
shaft a heads b and the fixing nuts c. The ends of the shaft and the bore of the heads
are smooth and the latter is furnished with recesses for receiving the ends of the
shaft and the nuts c. These nuts made of metal are screw threaded interiorly and
are provided on their outer sides, which are of oval form, with apertures for receiving
the screw-driver.
After these parts have been placed one into the other in the above described order,
the nuts are put on and turned until the several parts bear intimately against each
other, whereby a firm connection will be obtained.
Construction III Fig. 4. This construction is similar to construction II from which
it differs only by the nut being so formed as to cover the end of the barrel. Nuts of
this form serve to protect the wooden barrels against injury when they are placed on
the spindles.
Construction IV Fig. 5. The bobbin in this case consists of the shaft a heads b and

page_text: nuts c. The exterior surfaces of the ends of the shaft are smooth and the hole there-
through is somewhat enlarged at the ends for receiving the nuts.
The nuts made of metal are of an angular cross section and are screw threaded on
their outer surface; the arms of the nuts which are so long that they extend over the
heads, are furnished with openings to receive the screw-driver. The heads are smooth
on their inside and provided on their lower sides with recesses for the enlarged part
of the ends of the shaft and also if necessary on the upper sides for receiving the nuts.
After these parts have been connected together and the nuts are screwed in place the
bobbin is finished.
Construction Va Fig. 6. This construction of the bobbin is similar to the last
described construction. The bobbin made according to Fig. 6 consists of the shaft a
heads and fixing nuts c. The extremities of the shaft are smooth. The bore of
the heads is somewhat larger than the diameter of the ends of the shaft for receiving
the nuts. The metallic nuts which have an angular cross section are screw threaded
inside and outside, and are perforated at their outer sides for receiving a screw-key.
After the heads have been placed on the extremities of the shaft the fixing nuts are
screwed in. By the screw threads which will thus be formed on the extremities of
the shafts as well as in the bore of the heads, these parts will be firmly connected with
each other.
Construction Vb Fig. 7. This construction is similar to the construction Vª but the
portion of the angular nuts extending over the heads is dispensed with. The nuts
in this case are simple rings or tubes which are threaded inside and outside and
provided at top with two recesses for fixing the same.
Construction VI Fig. 8. A metallic ring or tube d extending to the shoulder c is
put upon each barrel and the adjacent ends of the tubes a are turned over this con-
nection as shown. The heads are placed upon the shaft and the outer ends of the
metal rings or tubes d are bent by means of suitable apparatus over the heads whereby
these parts are firmly held together.
Constructions VII and VIII Figs. 9 and 10. The bobbins according to these con-
structions consist of the shaft a heads and fixing boxes or tubes c. The heads are
coated on their inside with an adhesive matter, and driven upon the shaft; the boxes
or tubes having a collar extending over the heads are glued into the apertures in the
barrels. To save material the boxes or tubes are very short. By these means easily
coherent material can be joined together.
Construction IX Fig. 11. In this construction the bobbin consists of the usual
shaft and the barrels the bore of each of which is enlarged at its end. After the
heads 6 have been fastened, a ring e of paper wood or metal is applied to each end of the
bobbin and the boxes or tubes d, the shape of which corresponds to that of the rings,
are fastened by means of glue.
Construction IX Fig. 12. In this construction in lieu of the rings c used in the
last arrangement a paper disc c may be employed having a thickness such that
it will extend under pressure so that a recess in the end of the barrel d will be
filled up.
Construction X Fig. 13. In this construction the shaft is somewhat altered as the
ends of the tube a are turned over upon the shoulder d' only at the outer ends of
the barrels. The tube passes through the heads and is conically shaped in order to
prevent the heads from slipping endwise. The fastening is effected by means of
rings c of paper wood or metal, and over-lapping fixing boxes or inbes das in
Figs. 11 & 12.
Construction X Figs. 14ª & 14°. In this construction the boxes are made of one
single piece and are of the same cross section as in the constructions 9 & 10ª (Figs. 11
and 13) for receiving the fastening discs, which are made of metal or paste-board and
have originally the shape shown in Fig. 14. After the heads have been fastened,
these pieces are placed on the extremities of the shafte so that the sharp edge a is
forced slightly into the heads and the edge y catches into the recess 2 of the box.
When a pressure is exerted by means of suitable tools on the annular surface of the

page_text: rings, the edge is forced to a certain depth into the heads, while by flattening the
bow, the edge y catches into the recess of the ends of the box, a secure fastening
being thereby attained.
Construction XI Fig. 15. By this construction the edges of the tube can be turned
upon the shoulder c although the ends of the box are of conical form with the larger
ends outward. The conical shape has for its object to prevent the head 6 from being
removed after the intermediate space between the box and the head has been filled up.
These hobbins are manufactured by placing the heads centrally upon the ends of the
boxes and by filling at the same time the intermediate space between the heads and
boxes with paper, putty or metal so that these two parts are firmly connected together.
The shoulder c is deeply notched so that a strong cone will be produced, whereby
the strength or resistance of the heads to lateral pressure will be considerably
increased.
When the head of such a bobbin is damaged and is to be replaced it is only
necessary to remove by means of a pointed chisel the filling mass and to take off
the injured head and for replacing it by a new one in the above described manner.
With the constructions hereinafter described repairs are not so easily made but a
firm connection between the tube wall and the box is attained.
Construction provided with an elastic ring Fig. 16. In this construction the con-
nection of the heads a with the tube b is effected by the boxes c in which are inserted
elastic rings & made of steel wire. These rings hold the said parts together, as they
bear against the wall of the tube after the boxes have been forced therein. At the
slightest strain to which the boxes are subjected the edges of the rings, which are of a
triangular cross section penetrate into the wall of the tube and thus prevent the boxes
from being removed.
Construction in which screw threaded boxes are used Fig. 17. The heads a and
the tube bare fastened together by boxes c that are screw-threaded externally. The
boxes are screwed into the tube of paper, the inside of which is also provided with
screw-threads, and hold the heads and the tube firmly together owing to the
cone shaped ends of the boxes entering correspondingly formed recesses in the
heads a.
Construction shewn in Fig. 18. In this construction the tube of paper passes
entirely through the bore of the heads a and is forced by suitable means so as to
At the
fit tightly against the bevelled walls of the recesses formed in the heads a.
same time the screw threads for receiving the boxes are produced in the paper tube.
The boxes thus screwed in give the connection the necessary strength.
Construction shewn in Fig. 19. The bobbin made according to this construction
consists of heads a tube 6 boxes c and fastening pins d and it is manufactured in the
following way.
The heads a are placed on the tube b and the ends of the latter
forced by suitable means so as to fit tightly against the inner walls of the conically
shaped bore of the heads. The pins d are then introduced into the apertures and
fastened therein by rivetting the extremities of the same. The boxes c are in part of
cylindrical shape and in part of conical form corresponding to the conical
aperture of the tube. The portion of the box extending into the tube, is
furnished with a recess arranged at the same distance from the end of the box as the
holding pins are distant from the end of the tube. To introduce the boxes two faces
are provided allowing the boxes to penetrate up to the pins. The boxes are then
turned through a quarter of a revolution to the right or to the left, so that the pins &
will be completely enclosed by the recesses y. In carrying out the construction
shewn in Fig. 20 one of the boxes together with the traverses or holding rods d d¹ is
introduced into the end of the tube and the traverse are then held fast by means of
suitable tongs passed through the opening o of the other box so that this box can be
introduced so far that the traverses extend up to the groove y. By turning the two
boxes through 90° the traverses will be completely surrounded by the grooves and
the tongs holding the traverses may be withdrawn. The two traverses will then
firmly hold the several parts of the bobbin together.
To protect the boxes constructed according to the former specification hereinbefore

page_text: referred to and those hereinbefore described armatures or cap pieces may be used
as follows; Armatures or cap pieces according to Figs. 21 are placed inside
the box and armatures according to Fig. 22 extend over the boxes. These pieces
are produced by stamping out suitable blanks such as shewn in Figs. 21 and 22"
coining them in dies (see Figs. 21° and 22°) and forcing them into or turning them
upon the boxes by suitable machinery. The construction of the tubes described in
the said former specification and intended for use in wool and cotton spinning, is
modified whereby the mode of manufacturing the same is simplified and the durability
of the same increased.
The different parts such as collars and boxes have hitherto been quite finished before
being united with the tube and they have then been connected therewith.
The
recesses were cut out likewise after these pieces were made. According to this
improved method boxes and collars or rings are connected with the tube simul-
taneously by a single pressure and the recesses produced so that the tube leaves the
mould in a quite finished state. The mould for producing the tube (Fig. 24) consists
of the side portions a a the core b with the filling sheets c the pieces d provided with
shoulders for producing the grooves and the lower piece e. For manufacturing the tube
the straight tubular piece is placed upon the core b provided with the filling sheets
and the tubular pieces necessary for producing the collars and boxes are then applied.
These parts are still soft from the preceding stage of manufacture so that their shape
may be modified as desired. In order to give each other mutual hold the said parts
are coated with adhesive substance. The different parts connected with each other
by these means are placed in the above described mould the pieces d and e are applied
and the whole submitted to a heavy hydraulic pressure. The projecting tubular
pieces are then jumped so as to form the tube represented in Fig. 24 of the accom-
panying drawings.
1.1. Adil
1 1000
F. J. BROUGHAM.
COMPLETE
SPECIFICATION.
Improvements in the Manufacture of Bobbins.
I, FREDERICK JOHN BROUGHAM, of 46 Lincoln's Inn Fields, in the County of
Middlesex, Managing Clerk, 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 :-
Bobbins made of compressed paper offer great advantages as compared with wooden
bobbins but it is more difficult to repair them than the wooden ones.
Although compressed paper bobbins do not often need repairing yet it has been
found necessary to construct them in such a manner that it is possible to replace a
head when broken easily and rapidly.
A construction similar to that of the ordinary wooden bobbin cannot be employed,
as paper and wood cannot be connected together by means of ordinary glue so as to
afford the required strength. It is therefore necessary to fix the paper by other means
to the wooden part.
In the specification of prior Letters Patent No. 1681 A.D. 1881 there are described
means for fixing the paper to the wooden parts of the bobbin. According to the
present invention the connection is effected in the several ways hereinafter described.
As shown in Fig. 1 of the drawings filed with my Provisional Specification, the
stem or shaft of the bobbin is composed of the paper tube a and the wooden bush b.
As in the former specification bereinbefore referred to the tube a is made from paper
or thin paste-board, which is suitably cut to the required length and rolled; the bush b
is made from wood by means of suitable machinery.
The bushes coated with an adhesive substance are first forced into the tube by means
of a mechanical device in such a manner that they occupy the place corresponding to
the required length of the bobbin. These pieces provisionally assembled in the manner
described are then placed into a mould mounted on a machine.

page_text: Suitable rotating rubbers advance from both sides towards the projecting ends of the
tube and turn them over upon the shoulders c so that the bushes 6 are firmly connected
with the tube a. The hereinafter described arrangements have for their object to
enable the heads to be secured in a solid manner, to the shaft or stem composed of
tube and bushes. Several methods or constructions for the attachment of the head of
a bobbin to the shaft or stem are shewn in the drawings and will be described in
numerical order.
The first method is illustrated in Fig. 2. The bobbin consists of the heads bb and
the shaft a a as above described; the interior of the heads and the exterior of the shaft
being threaded.
The second method is shewn in Fig. 2. The bobbin comprises the shaft a, heads b,
and fixing nuts c. The ends of the shaft and the bore of the heads are smooth and the
latter is furnished with recesses for receiving the ends of the shaft and the nuts c.
These nuts, made of metal, are screw-threaded interiorly and are provided on their
outer sides which are of oval form, with apertures for receiving the screw-driver.
After these parts have been placed one into the other in the above described order,
the nuts are put on and turned until the several parts bear intimately against each
other whereby a firm connection will be obtained.
The third arrangement (Fig. 4) is similar to that shewn in Fig. 3 from which it
differs only by the nut being so formed as to cover the end of the barrel. Nuts of
this form serve to protect the wooden barrels against injury when they are placed on
the spindles.
nuts c.
In the arrangement shewn in Fig. 5 the bobbin comprises the shaft a heads b and
The exterior surfaces of the ends of the shaft are smooth and the hole there-
through is somewhat enlarged at the ends for receiving the nuts. The nuts are made
of metal and are screw-threaded on their outer surface; the arms or flanges of the
nuts which are so long that they extend over the heads are furnished with openings to
receive the screw-driver. The heads are smooth on their inside and provided on their
lower sides with recesses for the enlarged part of the ends of the shaft and also if
necessary on the upper sides for receiving the nuts. After the several parts have been
connected together and the nuts are screwed in place the bobbin is finished.
The arrangement shewn in Fig. 6 is similar to that last described. The bobbin
consists of the shaft a the heads bb and fixing nuts c c.
The extremities of the shaft
are smooth. The bore of the heads is somewhat larger than the diameter of the ends
of the shaft in order to receive the nuts. The metallic nuts are screw threaded inside
and outside, and are perforated at their outer sides for receiving a screw-key. After
the heads have been placed on the extremities of the shafts, the fixing nuts are screwed
in. By the screw threads, which will thus be formed on the extremities of the shafts as
well as in the bore of the heads, these parts will be firmly connected with each
other.
The arrangement shewn in Fig. 7 is similar to that shewn in Fig. 6 except that
the portion of the nuts extending over the heads,
dispensed with. The nuts in this
case are simple rings or tubes which are threaded inside and outside and provided at
top with two recesses for receiving a screw key.
In the arrangement shewn in Fig. 8. a metallic ring or tube d extending to the
shoulder c is put upon each barrel and the adjacent ends of the tube a are turned over
this connection as shewn. The heads are placed upon the shaft and the outer ends of
the metal rings or tubes d are bent by means of suitable apparatus over the heads,
whereby these parts are firmly held together.
In the arrangements shewn in Figs. 9 & 10 the bobbins comprise the shaft a heads b
and fixing boxes or tubes c. The heads are coated on their inside with an adhesive
matter, and driven upon the shaft; the boxes or tubes having a collar extending over
the heads, are glued into the apertures in the barrels. To save material the boxes or
tubes care very short. By these means easily adherent materials can be joined
together.
In the arrangement shewn in Fig. 11 the bobbin consists of the usual shaft and the
bushes the bore of each of which is enlarged at its end. After the heads b have been

page_text: fastened, a ring of paper, wood or metal is applied to each end of the bobbin, and
the boxes or tubes
the shape of which corresponds to that of the rings, are fastened
by means of glue.
In the arrangement shewn in Fig. 12 in lieu of the ring e used in the last arrange-
ment a paper disc c may be employed having a thickness such that it will extend under
pressure so that a recess in the end of the bush d will be filled up.
In the arrangement shown in Fig. 13 the shaft is somewhat altered as the ends of
the tube a are turned over upon the shoulder d' only at the outer end of the bush. The
tube passes through the heads and is conically shaped in order to prevent the heads
from slipping endwise. The fastening is effected by means of rings c of paper, wood
or metal, and over-lapping fixing bushes d as in Figs. Ii and 12.
In Figs. 14 and 14 the bushes are made of one single piece and are of the same
cross-section as in Figs. 11 and 13 for receiving the fastening discs which are made
of metal or pasteboard and have originally the shape shewn in Fig. 14. After the
heads have been fastened these pieces are placed on the extremities of the shafts, so
that the sharp edge is forced slightly into the heads and the edge y catches into the
recess of the bush. When a pressure is exerted by means of suitable tools on
the annular surface of the rings the edge a is forced to a certain depth into the
heads, while by flattening the bow, the edge y catches into the recess of the ends
of the bush, a secure fastening being thereby attained.
In the arrangement shewn in Fig. 15 the edges of the tube can be turned
upon the shoulder c although the ends of the bush are of conical form with the
enlarged ends outward. The conical shape has for its object to prevent the head b
from being removed after the intermediate space between the bush and the head
has been filled up. These bobbins are manufactured by placing the heads centrally
upon the ends of the bushes and by filling at the same time the intermediate space
between the heads and bushes with paper, putty or metal so that these two parts are
firmly connected together. The shoulder c is deeply notched so that a strong cone
will be produced, whereby the strength or resistance of the heads to lateral pressure
will be considerably increased.
When the head of such a bobbin is damaged and is to be replaced, it is only
necessary to remove by means of a pointed chisel, the filling material and to take
off the injured head to replace it by a new one in the above described manner.
In the arrangements hereinafter described repairs are not so easily made but a
firm connection between the tube and the bush is attained.
In the arrangement shewn in Fig. 16 the connection of the heads a with the tube b
is effected by the bushes c in which are inserted elastic rings d made of steel wire.
These rings hold the said parts together as they bear against the wall of the tube after
the bushes have been forced therein. At the slightest strain to which the bushes are
subjected the edges of the rings, which are of a triangular cross-section, penetrate into
the wall of the tube and thus prevent the bushes from being removed.
C
In the arrangement shewn in Fig. 17 the heads a and the tube baro fastened
together by bushes which are screw threaded externally. The bushes are screwed
into the tube of paper, the inside of which is also provided with screw threads, and
hold the heads and the tube firmly together owing to the cone-shaped ends of the
bushes entering correspondingly formed recesses in the heads a.
In the arrangement shewn in Fig. 18 the tube of paper passes entirely through the
bore of the heads a and is forced by suitable means so as to fit tightly against the
bevelled walls of the recesses formed in the heads a. At the same time the screw
threads for receiving the bushes are produced in the paper tube. The bushes thus
screwed in give the connection the necessary strength.
In the arrangement shewn in Fig. 19 the bobbin consists of heads a, tube b,
bushes c, and fastening pins d and it is manufactured in the following way :-
The heads a are placed on the tube 6 and the ends of the latter forced by suitable
means so as to fit tightly against the inner walls of the conically shaped bore of
the heads. The pins d are then introduced into the apertures and fastened therein
by rivetting their extremities. The bushes c are in part of cylindrical shape and

page_text: in part of conical form corresponding to the conical aperture of the tube. The
portion of the bush extending into the tube, is furnished with a recess arranged
at the same distance from the end of the bush as the holding pins are distant
from the ends of the tube. To introduce the bushes two faces are provided
allowing the bushes to penetrate up to the pins. The bushes are then turned
through a quarter of a revolution to the right or to the left so that the pins d
will be completely enclosed by the recesses x. In carrying out the arrangement
shewn in Fig. 20 one of the bushes together with the traverses or holding rods d d
is introduced into the end of the tube and the traverses are then held fast by
means of suitable tongs passed through the opening o of the other bush so that
this bush can be introduced so far that the traverses extend up to the groove y.
By turning the two bushes through 90° the traverses will be completely sur-
rounded by the grooves and the tongs holding the traverses may be withdrawn.
The two traverses will then firmly hold the several parts of the bobbin together.
To protect the bushes constructed according to the former specification herein-
before referred to and those hereinbefore described, armatures or cap pieces may
be used as follows:-
Armatures or cap pieces according to Fig. 21 are placed inside the bushes and
armatures according to Fig. 22 extend over the bushes. These pieces are produced
by stamping out suitable blanks such as shewn in Figs. 21 and 22 bending them
in dies (see Figs. 21° & 22°) and forcing them into or turning them upon the
bushes by suitable machinery.
The construction of the tubes described in the said former specification and
intended for use in wool and cotton spinning, is modified whereby the mode of
manufacturing the same is simplified and the durability of the same increased.
The different parts such as collars and bushes have hitherto been quite finished
before being united with the tube and they have then been connected therewith. The
recesses were cut out likewise after these pieces were made. According to this
improved method bushes and collars or rings are connected with the tube simul-
taneously by a single pressure and the recesses produced so that the tube leaves
the mould in a quite finished state. The mould for producing the tube (Fig. 24)
consists of the side portions a a the core with the filling sheets c the pieces d
provided with shoulders for producing the grooves and the lower piece e.
of the side portions a of the mould illustrated in Fig. 23 is provided with guide
pins, which enter corresponding holes in the other. The two portions when thus
placed are pressed firmly together by means of a screw clamp.
One
For manufacturing the tube the straight tubular piece is placed upon the
core 6 provided with the filling sheets and the tubular pieces necessary for pro-
ducing the collars and bushes are then supplied.
These parts are still soft from the preceding stage of manufacture, so that their
shape may be modified as desired. In order to give each other mutual hold the said
parts are coated with an adhesive substance. The different parts connected with each
other by these means are placed into the above described mould, the pieces d and e
are applied and the whole submitted to a heavy hydraulic pressure. The projecting
tubular pieces are then jumped so as to form the tube represented in Fig. 24 of the
accompanying drawings.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim in bobbins, is :-
1. The connection of the tube a with the bush 6 by turning the edges of
the tube upon the shoulder c substantially as set forth and shewn in Fig. 1 of the
accompanying drawings.
2. The construction of the bush a and its connection with the heads b by means of
screw-threads substantially as described with reference to Fig. 2.
3. The connection of the heads b with the shaft or stem a by means of the

page_text: "
screw-discs or screw rings c substantially as described with reference to and shewn in
Figs. 3, 4, 5, 6 & 7.
4. The connection of the heads with the shaft or stem by means of rings c made
of sheet metal substantially as shewn in Fig. 7.
5. The connection of the head with the shaft a by means of the bush c as illustrated
in Figs. 9 & 10.
6. The connection of the heads with the shaft a by means of the bushes & and
plates cas illustrated in Figs. 11, 12, 13, 14ª, & 14°.
7. The connection of the head 6 provided with a conical aperture with the
shaft a by means of the conically turned top of the bush d and of the inserted
ring e or by filling the intermediate space with other material as illustrated in
Fig. 15.
8. The application of the ring d for preventing the bush c from being withdrawn
as illustrated in Fig. 16.
с
9. The connection of the bush c with the tube 6 by means of screw threads applied
to the bush as illustrated in Figs. 17 & 18.
10. The mutual connection of the two bushes by means of a bayonet joint, the
fastening pins d d and the traverses d & d' as illustrated in Figs. 19 & 20.
11. The connection of the armature pieces c with the bushes a as illustrated in
Figs. 21 & 22.
12. The improved manufacture of bobbin consisting of the tube f the plug g'and the
collar pieces which parts are made of paper previously rolled by means of special
machines and cut to the required length and then joined together and compressed in
the manner illustrated in Fig. 23 whereby the plugs and collars are brought into the
required shape and firmly connected with the tube and the recesses i are produced so
that the tubes leave the mould in a finished condition as represented in Fig. 24 of the
accompanying drawings.
13. The construction of the moulds serving to manufacture the above said bobbins
which moulds consist of the side pieces a a the core b with the filling plates c of sheet
metal the inserted piece d provided with projections for producing the recesses and
the lower inserted piece e substantially as set forth and shewn in Fig. 23 of the
accompanying drawings.
Dated thio 24th day of Mov 1080