Improved System of Moulding Screws.
Year: 1895

page_text: Date of Application, 17th Apr., 1895
Complete Specification Left, 17th Jan., 1896-Accepted, 7th Mar., 1896
PROVISIONAL SPECIFICATION.
Improved System of Moulding Screws.
I
We JOHN VICARS, THOMAS VICARS, and JOHN VICARS the younger, all of
56 Seel Street Liverpool in the County of Lancaster, Engineers, do hereby declare
the nature of this invention to be as follows:-
The invention relates more especially to the production of so called Archimedean
or conveyor screws or worms. The main objects are to provide an improved
system of moulding whereby the said screws or worms are produced in a simpler
manner than heretofore with greater rapidity and regularity, and without the use
of mould boxes.
Our improved system consists essentially in supporting a true pattern of at least
equal length to the desired screw or worm on metal blocks or rests at suitable
distances apart within a trench; in placing parting, end or division plates around
the pattern at distances apart equal to the length of the desired screws or worms;
in ramming sand around the said pattern within the trench; and in screwing the
said pattern out of the moulds so formed.
The parting plates are made in two or more pieces where necessary.
A square
or other device is formed on the end of the pattern to enable it to be screwed out
of the mould by means of a lever handle or other suitable agent. A stake or
vee piece driven in the ground outside the mould is used to prevent lateral motion
of the pattern whilst being unscrewed.. Gitts are provided as required.
Dated the 16th day of April 1895.
J. JOHNSON,
Agent.
We JOHN VIOARS, THOMAS VICARS, and JOHN VICARS the younger all of
56 Seel Street, Liverpool in the County of Lancaster, Engineers, 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:
The invention relates more especially to the production of so-called Archimedean
or conveyor screws or worms. The main objects are to provide an improved
system of moulding whereby the said screws or worms are produced in a simpler
manner than heretofore with greater rapidity and regularity and without the use of
mould boxes.
•
Our improved system consists essentially in supporting a true pattern of at least
equal length to the desired screw or worm on metal blocks or rests at suitable
distances apart within a trench; in placing parting, end or division plates around
the pattern at distances apart equal to the length of the desired screws or worms;
in ramming sand around the said pattern within the trench; and in screwing the
Baid pattern out of the moulds so formed.
The parting plates are made in two or more pieces where necessary.
A Bquare
or other device is formed on the end of the pattern to enable it to be crewed out

page_text: of the mould by means of a lever handle or other suitable agent. A stake or
vee piece driven in the ground outside the mould is used to prevent lateral motion
of the pattern whilst being unscrewed. Gits are provided as required.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a longitudinal vertical section showing the commencement of the
moulding operation, and Fig. 2 is a transverse section, and Fig. 3 a longitudinal
vertical section showing the completing of the moulding operation.
a is a trench in the floor in which the moulding is conducted. bare metal blocks
or rests for the pattern. c is the pattern in length at least equal to the screw or
worm to be produced. The said pattern is made of metal truly finished and the
core of the screw or worm is extended at each end in the form of cylindrical
spindles. The said spindles are made with squares to enable the pattern
to be turned by means of spanners or keys. d is an end parting plate with a
cylindrical hole through which passes the. spindle c'. is a parting or division
plate made with a nut opening to fit the thread of the worm or screw. The said
plate d' is run on to the pattern so that it is the required distance from the end of
the pattern. The parting plates may be made in halves if desired.
If the pattern
is long enough for two or more screws or worms, one or more division parting-
plates similar to d may be placed on the pattern the desired distances apart. The
parting-plates and pattern are placed in the trench and pressed down until the
pattern c rests on the blocks b, and the parting-plates are embedded in the sides
and bottom of the trench. Stakes e are driven in outside the end parting-plates to
retain them in position whilst the mould is being rammed. The parts for moulding
now being in position the sand is rammed in around the pattern until the trench
between the parting plates is filled as shown in Fig. 3. A weighted cover f is then
placed on the sand, and the sleaking, ramming, formation of gits, airways, and the
fike, is conducted in the usual way. When the moulding is completed, the pattern
is screwed out of the mould by means of the squares on the spindles, and as the
pattern is unscrewed its free end rests on the blocks b outside the mould, whilst
lateral motion is prevented by means of stakes or vee pieces ġ driven into the trench
at suitable distances apart.
When the pattern is withdrawn, the ends of the mould are stopped and metal is
poured in.
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 is :
First. Moulding screws or worms substantially as and by the means herein set
forth.
Second. The process of moulding screws or worms by means of a true pattern at
least equal to the length of the desired screw or worm supported on rests within a
trench substantially as set forth.
Third. The combination of the trench a, with the rests b, pattern c, parting-
plates d, and stakes e and g substantially as and for the purpose set forth.
Dated the 16th day of January 1896.
J. JOHNSON,
Agent.