and in Machinery for Casting the Bodies thereof.
Year: 1885

page_text: and in Machinery for Casting the Bodies thereof.
I, EDWIN MILLER RICHFORD of 44 Snow Hill in the City of London, Rubber
Type Manufacturer, do hereby declare the nature of my said invention for
IMPROVEMENTS IN THE MANUFACTURE OF METAL BODIED RUBBER TYPE AND IN
MACHINERY FOR CASTING THE BODIES THEREOF to be as follows:-
My invention relates to the manufacture of metal bodied rubber faced type used
for stamping and endorsing purposes and it has for its object to ensure the rubber
face adhering firmly to the metal body so as not to be liable to strip off after little
wear which is an objection to such type as heretofore made. To this end the
invention consists in forming in the end of the metal body to which the rubber
face is to be applied, one or more undercut cross grooves forming with the rubber
run into them, a dovetailed connection between the body and the rubber face
which ensures a very firm hold. I am aware that it has before been proposed to
cross groove the end of the metal body by making one or more saw cuts or by
planing parallel sided grooves in them but this form of groove is very inadequate
to afford the necessary hold depending as it does upon the mere adhesion between
the surfaces of the rubber and inetal.
My invention also relates to moulds for casting the metal bodies with one or
more cross grooves of the form above described in the end to which the rubber is
to be applied and it consists in providing the mould with a movable core pin or
pins of a sectional form corresponding to the desired form of the groove or grooves,
said pin or pins being fitted to slide through holes in one side of the mould and in
close contact with the matrix or end of the mould, said pin or pins being slid
in and out of the mould at the proper times by a suitable mechanical arrangement
so that the metal shall be cast around the pin or pins which would be withdrawn
when the metal has solidified, leaving the type body free to be ejected from the
mould with a groove or grooves of the proper form and requiring no dressing to
finish it.

page_text: and in Machinery for Casting the Bodies thereof.
I, EDWIN MILLER RICHFORD of 44 Snow Hill in the City of London Rubber
Type Manufacturer, 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 :-
==
My Invention relates to the manufacture of metal bodied rubber faced type used
for endorsing and other stamps; and it has for its object to ensure a firmer union
of the rubber face to the metal body, so that the former shall not be liable to peel
off, which is an objection to such type as heretofore made.
My Invention consists, first, of a metal bodied rubber faced type, in which the
face is united to the body by a dovetailed connection, formed, by one or more
undercut cross grooves in the end of the metal body, and by the rubber which is
forced into said groove or grooves in the process of vulcanization; whereby a very
firm union is obtained. I am aware that it has before been proposed to cross-
groove the end of the metal body, by making one or more saw cuts, or by planing
parallel sided grooves in them but this form of groove is very inadequate to afford
the necessary hold, depending as it does upon the mere adhesion between the
surfaces of the rubber and metal.
My Invention relates secondly to the type founding machine for casting the
metal type or type-bodies for the purpose of making rubber faced type as above
described; and it consists in providing the mould with one or more core pins fitted
to slide through holes in one side of the mould and to project across the cavity of
the mould in close proximity to the matrix or the end of the mould (according as a.
type or a type body is to be cast) said pin or pins being slid in and out at the
proper times by a suitable mechanical arrangement so that the metal shall be cast
around the pin or pins which will then be withdrawn leaving the casting free to be 2
ejected from the mould.
Reference is to be had to the accompanying drawings which represent on a
magnified scalo in Figure 1. a type constructed according to iny Invention and in.
Figure 2 the metal body separately.
a is the metal body and b the rubber face on which a printing character is 3
formed by vulcanization in a suitable matrix in the usual way. Across the top
end of the body a on to which the rubber face is to be applied I form preferably
two transverse grooves c of round or any other sectional form such that the sides.
of the grooves are undercut that is to say the grooves are narrower at the top than
they are below so as to form with the rubber forced therein a dovetailed connection.
These grooves extend from side to side of the type-body and are preferably produced
in the casting of 'the type or type-body by means of core pins in the mould as
hereafter described.
I have represented in Figures 3 to 6 sufficient of a type founding machine to
show the application thereto of my improvements, Figure 3 being a front elevation, 4
Figure 4 a plan, and Figure 5 an end elevation of the mould (open), the main

page_text: shaft, and parts in connection therewith for operating the devices of my Invention.
Figure 6 is a front elevation of the mould closed. The matrix is omitted in all the
Figures.
d is the lower or fixed half of the mould or die, and the top or movable half;
both being of the usual construction, except that two core pins f (of round or
other suitable section) are fitted to slide through holes in the part of the lower
half d which constitutes one side of the mould cavity, said coro pins being attached
to a holder, or cross-head g, sliding in a guide h, on the framing, and receiving
reciprocating motion at proper times, in one direction from a cam i on the main
shaft k, and in the other direction from a spring 1; both cam and spring acting.on
a lever m pivoted to the framing and connected to the holder g. The core pins f
are as close as possible to the end of the mould against which the matrix is to be
applied, and, by the action of the spring, they are caused, at the moment when
the metal is about to be injected into the mould, to project across the cavity
of the mould, until their ends touch the part of the top half e which constitutes
the opposite side of the mould cavity, as shown in Figure 6. After the injection
of the metal in the usual way the pins are retracted by the cam, to the position
shown in Figures 3 and 4, so as to leave the casting free to be ejected from the
mould which then opens all in the usual way in such machines.
When the mould is used for casting type-bodies resembling "quads" with under
cut cross-grooves in the top the matrix closing the end of the mould would be a
plain flat plate, and if the core pins be incluse contact there with grooves of the
desired form may be produced by casting only without further dressing, but if
the core pins be not in absolute contact with the plate or matrix the metal would
run entirely around the core' pins which would in that case leave complete holes in
the type-body: These holes would then require to be opened out to form grooves
either by drawing a sharp pointed instrument across the end of the type body along
the line of the intended groove, or by planing off, or otherwise removing the metal
over the whole surface of the end of the type body until the holes are reached and
opened out to form grooves of the desired undercut form.
If a matrix bearing a printing character in intaglio be used for the mould and
the core-pins be in close contact therewith grooves will be forined in the shoulders
of the body and will pass in the form of holes beneath the printing character
formed on the type and the casting may either be used in that form or the printing
character may be removed to open out the grooves entirely across the type-body
as before.
Although I have shown and described the core pins as projecting from what is
technically known as the "body" of the mould (that is to say the changeable block
which determines what is known as the "body" of the type) I would observe that
the pins might enter the mould cavity from any part of the mould but the
arrangement I have shown is the most convenient.
It will be obvious that in lieu of retracting the core pins in order to disengage the
casting therefrom the relative motion between the core-pins and the surface from
which they project may be produced by fixing the core pins and making the body
of the mould movable, or by providing the body of the mould with an inner or
false side plate through which the core-pins would pass and which would be
movable along the core pins by means of a guided push rod passing through or
along the body of the mould and carrying the false side the push rod being
actuated by a cain and spring as before, as will be readily understood. Or, the
push rod might act directly on the casting to push it off the core pins.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is;-
1. A metal body for a rubber faced type, having one or more transverse grooves
of under cut or dove-tailed section across its top end as herein shown and described
for the purpose specified,

page_text: 2. A metal bodied rubber faced type wherein the body and face are united by a
dove-tailed connection formed by one or more under-cut cross grooves in the metal
body and by the rubber forced therein substantially as described and shown in the
drawings.
3. In a type founding machine the combination with the mould of one or more
core pins projecting across the cavity of the mould the pin or pins and the surface
from which they project (or a portion of such surface) being relatively movable in
the direction of the length of the pins for the purpose of removing the casting from
the pin or pins as specified.
4. The combination with the mould of a type-founding machine of one or more
core pins fitted to slide through one half of the mould or die and across the cavity
of the mould in close proximity to the matrix or end of the mould substantially as
herein described and shown in the drawings such pins being brought into position
before the metal is injected and retracted before the casting is ejected by suitable
mechanical devices operated from a moving part of the machine.
5. In a type founding machine the combination with the mould of one or more
core pins fitted to slide through one half of the mould and attached to a holder
or cross head ga lever m a spring and a cam i on the main-shaft combined for
operation substantially as herein described and shown in the drawings for the
purpose specified.