Improvements in the Method of Preparing Moulds for Casting Warded Keys, and in Appliances employed therein, and in the Means of Preparing such Improved Appliances.
Year: 1891

page_text: COMPLETE SPECIFICATION.
Improvements in the Method of Preparing Moulds for Casting
Warded Keys, and in Appliances employed therein, and in the
Means of Preparing such Improved Appliances.
I, THOMAS PEDLEY, of 72 Walsall Street, Willenhall in the County of Stafford,
Malleable Iron Founder, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention has for its chief object to simplify, facilitate, and considerably
expedite, the operation of preparing inoulds for casting warded keys, by employing
an improved appliance as hereinafter described.
According to this invention, the two half patterns for each warded key to be
moulded at the same operation, are fixed or formed on opposite sides of a metal
plate in position exactly coincident with one another. The pattern for the runner
is, preferably, divided also so that half is at each side of the plate.
The plate carrying the half patterns is placed between the moulding boxes, and
after the boxes have been rammed up the plate and patterns are removed, and the
boxes then brought together to make up the complete mould.
In order that the invention may be clearly understood, I will proceed to describe
the plate carrying the half patterns with reference to the accompanying drawings,
of which
Figure 1 is a plan of such plate and
Figure 2 an edge view thereof.
The plate is shewn broken in length and only a few of the key patterns shewn,
for convenience of illustration.
a are the half patterns on one side of the plate A, and a' the corresponding
half patterns on the other side thereof; is the half runner pattern on one side
of such plate, and the corresponding half runner pattern on the other side of
the plate. The respective halves of the patterns on the opposite sides of the plate
are, of course, exactly opposite to one another.
The half patterns may be cast together with the plate, but they are more con-
veniently prepared by being first formed in halves, by casting or otherwise, then
faced up on their flat sides, temporarily soldered together, and also riveted to one
another, then turned up and finished clean with the wards properly cut in. The
halves are then separated and riveted to the plate cach by rivets d.
If the plate carrying the half patterns is to be used for hand moulding, it is
placed between the moulding boxes and one of the boxes rammed up, after which
the boxes and plate are turned over and the other box rammed up. One of the
boxes is then lifted off the plate, and the plate and patterns are removed, and
the box which has been lifted therefrom is placed upon the other box and the mould
is then ready for casting.
The plate carrying the half patterns is, however, specially suitable for use with
Leeder's moulding machine described in Patent Specification No. 11,368 of 1888;
and, for such purpose, it is provided with an extension e (shewn by broken lines only)
through which it is bolted to the sleeve which turns on the pillar D' described in
such Specification, and also with a horn c¹ (shewn also by broken lines only) which
passes partially around and is stopped by the pillar on the opposite side of the
machine when the plate is moved in for moulding up.
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 The improved mailed of pranaring moulds for casting warded keys that is to

page_text: say by ramming up the mould on each side of a plate carrying the half patterns on
opposite sides, respectively, and inserted between the moulding boxes, and
afterwards removing such plate and patterns from between the boxes, and then
closing up the boxes to bring the two halves of the mould together, substantially as
described and shewn.
2. The plate A carrying on opposite sides, respectively, the halves a a' of warded
key patterns, substantially as described and shewn, for the purpose set forth.
3. Forming an appliance for use in preparing moulds for casting warded keys,
by fixing together in pairs half patterns of the intended keys and turning and
cleaning them up and cutting the wards therein, then separating them and fixing
them on opposite sides of a plate, substantially as described for the purpose
set forth.
Dated this 7th day of Anril 1891