IMPROVEMENTS IN "GEAR MOLDING MACHINES
Year: 1884

page_text: I PETER LISTON SIMPSON of Minneapolis, in the County of Hennepin and State
of Minnesota, one of the United States of America, Mechanic, do hereby declare
the nature of my invention for IMPROVEMENTS IN "GEAR MOLDING MACHINES,"
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 improvements in gear molding machines.
The objects of my invention, are to secure the accurate spacing of the teeth;
the vertical withdrawal of the tooth or teeth patterns; the horizontal movement
of the tooth block; to provide for the horizontal movement of the spur tooth
pattern without breaking away the edges of the mold and to provide for adjusting
the bevel tooth block or pattern to any angle that may be required.
My invention consists of an index cylinder fixed on a center spindle in conjunc-
tion with spindle arm and index arm with the mechanism attached to the same,
for the vertical or horizontal manipulation of the tooth block.
My invention consists further in providing the index cylinder with a series of
circles of perforations, each circle of which corresponds to the number of teeth or
cogs required on the gear or any multiple or division thereof.
Further important features of my invention will be more fully hereinafter
described and claimed.
Fig. 1, is a side elevation of the machine.
Fig. 2, is a vertical section taken longitudinally through the arm D.
Fig. 3, is a horizontal section on line x, x, showing the split hub.
Fig. 4, is an enlarged cross section of arm D, showing groove etc.
Fig. 5, is a plan view of the split collar, and
Fig. 6, is a detail view of the pattern for bevel wheels.
A, is a base or socket embedded in the foundry floor, in which is placed the
standard B. The standard B, may be provided with a spline fitting into a groove
in the socket A, by which means the standard is prevented from turning in the
socket.
To the top of the standard is secured the index cylinder or ring C, said cylinder
or ring being provided with a series of holes or perforations arranged in circles,
Each circle of which corresponds to the number of teeth or cogs required on the
.

page_text: "
gear or any multiple or division thereof. D, is an arm to which the mechanism for
inoving the tooth blocks aro attached, said arm being secured to one side of tho
split hub E, said hub having lugs east thereon to receive bolts for holding the parts
together and around the standard B, The hub E and arm D, is supported by a
split collar F, said collar being adjustable to any height on the standard B, and
secured by means of the bolt and screw nut b.
G, is an index arm, one end of which is secured to the arm D, while the upper
end of said arm is adapted to be secured to the index cylinder or ring O, by means
of a pin o, which is passed into a perforation or hole in the index cylinder, so that
after a tooth of the wheel has been molded in the sand, the pin c, is withdrawn and
the arm B, moved around ono space, where it is secured by the means above
mentioned, and another tooth formed, by which means the accurate and uniformn
spacing of the teeth is effected.
H, is a balance weight adjustably secured on an extension I, of the arm D, to
counteract the loverage of the arm D, on the shaft B, by reason of the weight of
said arm and the tooth forming devices.
The arm D, is provided with a longitudinal slot d, in which the slide K, is
moved back and forth, the sides of the slot d, being provided with bevelled rebates
to receive the bevelled edges of the slides as shown in Fig. 2.
On slide K, are cast two hubs L and M, the hub L being bored out to receive
the screw threaded bolt or rod-N, and the hub M being bored out to receive the
guide rod O.
The slide K, is moved back and forth in its ways in the arm D, by means of a
screw rod P, and hand crank Q, said screw rod being secured to the slide and in
suitable bearings to the armn D. To the lower ends of the rods N and O, nre
The
secured the plate or block R, to which the tooth blocks, is pivoted at a.
tooth forming block S, is designed for forming the teeth of bevelled gear wheels
and is adjustable on the block R, by means of a bolt and set scrow passing through
the segmental slot f, thus allowing the tooth block S, to be set at any angle to form
the teeth of any desired pitch. T, is a miter wheel provided with a scrow threaded
perforation through which the screw threaded rod N, passes.
The miter wheel T, meshes with a similar wheel U, the shaft of which is
mounted in the bracket V, secured to the hub L. The wheel U, is operated by
the handle W, the rotation of which tends to raise or lower the plate R, together
with the tooth plate, while the rod O, prevents the plate R, and the tooth block S,
from twisting or otherwise moving out of position.
A', is a bifurcated arm tlie upper end of which is adapted to slide in the groove S.
The prongs of the arm A, project downward on each side of the pattern tooth B¹,
so that when the tooth block is moved inwards after the tooth or teeth patterns are
rammed up with sand by holding the handle Y, while hand wheel Q, is operated,
the pattern tooth or teeth sliding out from between the prongs of the arm A, the
latter prevent the sand from fulling away by reason of the inward movement of
the pattern tooth or teeth towards the central shaft B.
The spur tooth B₁, is secured to the tooth block R, and is designed to form the
cogs of ordinary spur gear. It will be noticed that by the use of my machine,
the casting table is dispensed with, and that by having a number of the sockets
set in the foundry floor, the shaft, index cylinder, and the other devices can be
moved from one socket to the other and thus facilitato the work of casting, it being
understood that the molding sand is simply placed on the floor of the foundry and
the desired cavities formed therein by the devices already described.
It will also be noticed that by placing the arin which carrios the slide on which
the pattern teeth are mounted, on the central standard between the index cylinder
and the casting-bed, that I am enabled to form the patterns or mold for wheels of
large and small diameters varying in diameter froin a point near the central or
supporting standard to the outer end of the arm which carries the tooth holding
slide:

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1, In a gear molding machine, a stationary bed or socket, supporting a central
standard, to the upper portion of which, and above the molding bed is secured an
index or ring cylinder, a horizontal arm adapted to turn around said central
standard beneath the index cylinder and carrying adjustable devices for supporting
a tooth block, and a vertical bar connecting the horizontal bar with the index
cylinder as set forth.
2, In a gear molding machine, an index cylinder or ring mounted on a central
support or standard above the casting bed, a swinging arm carrying the tooth.
forming devices secured to the central support between the index.cylinder and the
casting bed, and a projecting arm connecting the swinging arm with the index
cylinder as set forth.
3, In a gear molding machine, an index cylinder or ring mounted on a central
support or standard above the casting bed, a swinging arm carrying the tooth
forming devices secured to the central support or standard, between the index
cylinder and the casting bed, an upwardly projecting arm connecting the swinging
arm with the index cylinder, in combination with the slide K, tooth plate R, and
adjusting devices, substantially as described.
4 In a gear molding machine, a plate carrying the tooth block, provided with an
adjusting screw bolt, and a guide rod, both of which pass through an adjustable
slide, a bevel gear wheel adapted to work on the adjusting screw, and mesh with a
similar wheel mounted in bearings on the adjustable slides; whereby the tooth
block is rendered vertically adjustable, as set forth.
5, In a gear molding machine the combination of the arm D, screw shaft P, and
slide K, carrying the tooth forming devices with the bifurcated arm, A', adjustably
connected to arin D, and adapted to straddle the tooth block as set forth.
Dated the fith dow of Con han 1001