Improvements in the Construction of Machines having Adjustable Patterns for Making Castings of Different Diameters and Various Faces.
Year: 1893

page_text: Date of Application, 27th Dec., 1893--Accepted, 27th Jan., 1894
COMPLETE SPECIFICATION.
Improvements in the Construction of Machines having Adjustable
Patterns for Making Castings of Different Diameters and Various
Faces.
I, ROBERT CAIRNS, of No. 901, Second Street, in the City of Watertown, in
the County of Jefferson and State of Wisconsin, United States of America, Molder,
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 has for its object to provide a machine embodying an adjustable
pattern for shell-like castings, such for example as belt-pulleys, whereby from one
pattern of fixed diameter molds may be made for castings of various faces, and a
further object of said invention is to have a series of adjustable patterns in the same
machine, each pattern being of a different diameter, and to these ends my said
invention consists in certain peculiarities of construction and combination of parts
as hereinafter set forth, and illustrated in the accompanying drawings, whereby the
said objects are attained.
differential pattern
Figure 1 represents a vertical transverse section of a
machine constructed according to my invention, and the drag portion of a flask
in place thereon.
Figure 2, a plan view of the machine, and drag, the latter being partly broken
away.
Figure 3, a horizontal section taken on line 3-3 of Figure 1, a portion of the
adjustable pattern being broken away and certain other parts of said machine
omitted.
Figure 4, a plan view partly in horizontal section on line 4-4 of Figure 1.
Figure 5, a perspective view of one of a series of columns embodied in the
aforesaid machine, and
Figure 6, a detail section taken on line 6-6 of Figure 1.
Referring by letter to the drawings A represents the base of my machine, and
this base has a central step for a screw-spindle B keyed at its lower portion in a
worm-wheel C that is preferably enclosed by a suitable casting D and in mesh
with a worm E on a shaft F, the latter having its bearings in the casting and a
horizontal portion of a bracket G fast on said base. Keyed on the outer end of
the shaft is a bevel-pinion H in mesh with a bevel-gear I fast on a vertical
stem J that has its bearing in a parallel portion of the bracket G, and this stem
may be actuated by a hand-wheel K or other suitable means to drive the gear in
connection therewith.
Bolted to the base A, at certain intervals adjacent to its outer edge, are the
flanged lower ends of pillars L, and the flanged upper ends of these pillars are
bolted to the underside of a table M having a central opening for the reception of the
thickened upper ends of a series of concentric skeleton columns N, O, that also
have lower end-flanges bolted to said base. All the upper ends of the columns N, O,
are flush with the table M, and the innermost column N, shown in detail by
Figure 5, has its upper end extended some distance toward the centre of the
machine in the form of a flange c provided with a seat for the shouldered edged of
a plate P that loosely engages the screw-spindle B to form a bearing for the
same, and by means of countersunk screws e engaging tapped openings in said

page_text: flange the plate is detachably secured in position flush with said table. The upper
ends of all the columns are so spaced as to leave a series of openings or guideways
that are normally closed by removable fillers Q having supporting lugs engaging
adjacent seats in said ends of the columns and the adjacent table. At this point
in the description it is proper to state that the concentric columns N, O, are
provided with suitable apertures through which the worm-shaft F is passed and it
may also be stated that while I prefer said columns, certain changes compatible
with the obtaining of spaces normally occupied by the fillers may be made
without departure from the spirit of my invention. Engaging the screw-spindle B
is a nut R, and held on the nut by any suitable means, such for instance as counter-
sunk screws engaging tapped openings therein, are mortise joined rings S having
arms S that extend outward through the interstices of the columns N, O, and are
stiffened by braces connecting their free ends with said nut, as clearly illustrated
in Figure 1, these free ends of the arms being shown as movable between parallel
guide-bars T adjustably secured to the base and table of the machine for the
purpose of compensating for wear. The rings and arms constitute a spider-like
support, and loose on said arms are grooved slides U designed to embrace the
lower edge of a pattern V when the latter is in position for use, these slides and
the pattern being locked together by means of pins i engaging registering perfora-
tions in both.
In assembling the machine or in case of repairs, the support for the patterns is
accessible through the innermost skeleton column N, the centre plate P at the top
of the same being unseated.
The machine herein shown is designed for a series of patterns, each of which has
a diameter greater or less than any of the others in the series, and the number and
diametrical dimensions of these patterns correspond with the fillers above
specified. In practice a pattern of the desired diameter is substituted for a filler of
like diameter, and after being made fast to the travelling support the pattern
may be raised or lowered at will to project beyond the upper end of the machine a
distance equal to one-half the width of the face of the casting to be produced, this
adjustment being effected by means of the worm-gear hereinbefore set forth.
The present machine is organized as one upon which to set up molds for
belt-pulleys of various diameters and faces, and for each rim pattern there is
corresponding pattern W for the spider portion of a complete pulley, this latter
pattern being provided with a depending centering lug that engages a corre-
sponding seat in the upper portion of said machine. For the hubs of the pulleys, I
may employ various sizes of patterns, and any one of the latter will be centered on
the spider-pattern as is usual in the art. The patterns having been properly
positioned, they are surrounded by a drag X placed bottom up on the table M, the
usual perforated lugs of the drag being engaged by collared dowels Y having
detachable connection with said table. The drag section of the mold having been
made in the usual manner it is removed and a cope positioned on the table, the usual
dowel on this cope being inserted in the perforations or seats m made vacant by the
removal of the aforesaid dowels Y, whereby said cope is held in place during the
operation of completing the mold.
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. The combination of a suitable table for the temporary support of a drag or cope,
a series of concentric guideways within the confines of the table, removable fillers
for the guideways, patterns interchangeable with the guideway fillers, and suitable
means for vertically adjusting a pattern in its guideway, substantially as set forth.
2. The combination of a base, a suitable table supported above the base, a series
of concentric guide-ways within the confines of the table, removable fillers for the
guideways, a rotative screw-spindle interposed between said base and table, a support
having a nut-connection with the spindle, slides normally loose on the support,

page_text: patterns interchangeable with the guideway-fillers, and suitable means for locking a
pattern to said slides, substantially as set forth.
3. The combination of a base, a series of pillars fast on the base, a table
supported on the pillars, a series of concentric skeleton columns secured to the base,
and having their upper ends spaced within the confines of the table in such a
manner as to leave guide-ways, removable fillers for the guide-ways, a closure for
the upper end of the inner column, patterns interchangeable with the guide-way
fillers, and suitable meaus for vertically adjusting a pattern in its guideway,.
substantially as set forth.
4. The combination of a base, a series of pillars fast thereon, a table fast to the
pillars, a series of concentric skeleton columns secured to the base and having their
upper ends spaced within the confines of the table in such a manner as to leave a
series of guideways, removable fillers for the guideways, a centre-plate seated in the
innermost column, a screw-spindle loose in said base and centre-plate, a suitable
gearing for the rotation of the spindle, a nut on said spindle, a spider-like support
fast on the nut, guides for the arms of the support, slides normally loose on said
arms, patterns interchangeable with the guideway fillers, and suitable means for
locking a pattern to said slides, substantially as set forth.
Dated this 27th day of December 1893.
ALLISON BROS.,
Agents for the Applicant..