Year: 1887

page_text: Date of Application, 24th Dec., 1887
Complete Specification Left, 20th Sept., 1888
Complete Specification Accepted, 26th Oct., 1888
I, WILLOUGHBY STATHAM SMITH the Younger, of 18 Wharf Road, City Road, in
the County of Middlesex, Telegraphic Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to covering wire with gutta percha and other similar plastic
compounds.
The outer case of the apparatus consists of a drum within which there is a ring
with teeth on its inside, the ring fitting the drum closely but being capable of turning
in it about their common axis. Inside the ring there is a toothed pinion mounted on
an eccentric axis and gearing at one point with the teeth of the ring so that by
turning the axis of the pinion the ring also is driven. The pinion is of such a sizo
that at the opposite point there is a space between the ends of the teeth of the ring
and pinion. In this space a curved plate is fixed and the ends of the teeth of the
pinion revolve in contact with one side of the plate whilst the ends of the teeth of the
ring revolve in contact with its other side. One end of the drum is fitted with a
hopper provided with feed rolls to introduce the gutta percha or other material into
the space between the ring and the pinion. The material thus introduced enters the
teeth both of the ring and pinion and is carried by them past the plate, but when the
plastic material comes to the point at which the teeth begin to gear with one another
it is forced out from between them. As more material is constantly brought in past
the plate, the space beyond the plate becomes filled and the material is put under
pressure. An orifice is provided through which it can escape to the usual dies for
covering the wire.
The external casing and central wheel and pinion are both chambered so as to
permit of strain being used for the purpose of heating and keeping the plastic
material up to any desired temperature.
Dated this 24th day of December 1887
CARPMAEL & Co.,
Agents for the Applicant.

page_text: Improvements in Apparatus for Covering or Insulating Wire,
I, WILLOUGHBY STATHAM SMITH the Younger, of 18 Wharf Road, City Road, in
the County of Middlesex, Telegraphic Engineer, 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 relates to covering wire with gutta percha and other similar plastic
compounds.
The outer case of the apparatus consists of a drum within which there is a ring
with teeth on its inside, the ring fitting the drum closely but being capable of turning
in it about their common axis. Inside the ring there is a toothed pinion mounted on
an eccentric axis and gearing at one point with the teeth of the ring so that by
turning the axis of the pinion the ring also is driven. The pinion is of such a size
that at the opposite point there is a space between the ends of the teeth of the ring
and pinion. In this space a curved plate is fixed and the ends of the teeth of the.
pinion revolve in contact with one side of the plate whilst the ends of the teeth of the
ring revolve in contact with its other side. One end of the drum is fitted with a
hopper provided with feed rolls to introduce the gutta percha or other material into
the space between the ring and the pinion. The material thus introduced enters the
teeth both of the ring and pinion and is carried by them past the plate, but when the
plastic material comes to the point at which the teeth begin to gear with one another
it is forced out from between them. As more material is constantly brought in past
the plate, the space beyond the plate becomes filled and the material is put under
pressure. An orifice is provided through which it can escape to the usual dies for
covering the wire.
The external casing and central ring and pinion are both chambered so as to permit
of steam being used for the purpose of heating the plastic material up to any desired
temperature.
In order that my said invention may be more fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed.
Figure 2 a side elevation, and
Figure 3 a plan of a machine constructed according to my invention.
a is a feed hopper containing gutta percha or other plastic material, which is fed forward
by two rolls. These two rolls are geared together by gear wheels c. The axis of the.
roll carries a worm wheel d which gears with a worm d' whose axis is driven by
the belt pulley e. At the bottom of the hopper there is a pipe f which leads to an
opening in the-top cover of the drum h. Within this drum there is a toothed
ring and an eccentric toothed pinion gearing with it. The lower end of the axis /¹
of this pinion carries a worm wheel which is in gear with the worm 13 driven by the
belt pulleys. Between the ring k and pinion there is, opposite to the point where

page_text: they gear with each other, a partition m fixed to the top and bottom covers of the
drum . In the bottom cover of the drum h there is an opening n on the opposite
side of the partition m to the opening 9. This opening n loads into a pipe o by which
the plastic material is conveyed to the box p which is traversed horizontally by the
wire which is to be covered, the wire when covered leaving the box through the
die q.
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. Forcing apparatus for covering or insulating wire consisting of a casing in
which there are two revolving toothed surfaces the covering material being conveyed
in one direction in their teeth and prevented from returning by reason of the teeth
gearing together at one point.
2. Apparatus for covering or insulating wire consisting of a drum into which the
material is fed by rollers or other feeding mechanism and within which are a toothed
ring and a pinion gearing together one of them being driven from without and also
a partition, past which the material is carried by the tooth of the ring and pinion and
is forced out towards a die through which the wire is led substantially as described.
3. The apparatus substantially as described and shown in the drawings.
Dated this 17th day of September 1888