in the Method of and Apparatus for Manufacturing the same.
Year: 1888

page_text: in the Method of and Apparatus for Manufacturing the same.
I, WILLIAM NYE WEEDEN, residing at New Bedford, in the County of Bristol and
State of Massachusetts, one of the United States of America, Gentleman, 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:-
Referring to the Drawings:
Figure 1, is a perspective view of the preliminary drawing die, punch and blank
used in the formation of my pinion.
Figure 2, is a central section of said die and a side elevation of said punch when in
action upon said blank.
Figure 3, is a perspective view of the blank as left by the preliminary dies together
with the drawing die and punch used for finishing the shaping of the same.
Figure 4, is a central section of said tools when in action upon said blank.
Figure 5, is a perspective view of the drawn pinion and of the punch and die used
for opening the closed end of said pinion.
Figure 6, is a side elevation of the punch and a central section of said die in position
for action upon the pinion.
Figure 7, is a perspective view of the completed pinion, and
Figure 8, is a like view of the same when attached to an arbor.
Letters of like name and kind refer to like parts in each of the figures.
The design of my invention is to produce pinions which shall have a maximum of
strength and durability combined with a minimum of weight and shall be capable of
construction at a relatively small expense, to which end said invention-
Consists, principally in the method employed; substantially as and for the purpose
hereinafter specified.
It consists further, in the mechanism used for the construction of a pinion sub-
stantially as and for the purpose hereinafter shown.
It consists, finally, in the pinion produced and its combination with an arbor sub-
stantially as and for the purpose hereinafter set forth.

page_text: In the carrying of my invention into practice, the pinion may be constructed in
various ways, but it will sufficiently illustrate.such invention to show the way pre-
ferably employed, in which I take a disc of sheet metal A, that in diameter and
thickness bears a certain pre-determined relation to the diameter, length, and number
of leaves of the finished pinion, and, by means of a male die, B, and a female die, C,
give to said blank the cup shape shown in Figures 2 and 3.
Said
I next employ a female die, D, which is provided with a central opening, d, that
has a grooved periphery, and through such opening force the blank, A, by means
of a male die, E, which corresponds to, but is somewhat smaller than said opening,
the result being the elongation of said blank and the formation upon its sides of
corrugations, a, that correspond in number to the number of teeth desired.
blank is then operated upon by other similar dies until its exterior has the exact
dimensions required after which it is placed within a properly shaped recess, f, of
a die, F, and by means of a punch, G, there is cut in the bottom or closed end
of said blank, a round opening, a', which has substantially the same diameter as the
space between the inner points of the corrugations, a, and is concentric with the
periphery of said blank.
The pinion is now ready for attachment to an arbor, H, which operation is effected
by placing said pinion within a holding die that is similar to the punching die, F,
forcing the arbor into its interior, and then securing said parts in relative positions by
staking, soldering, or any desired means.
The pinion described may be made from gold, silver, platinum, aluminum, brass,
steel or any metal or composition desired, as the quantity of metal required is so
small as to render its cost of but slight consequence, and when made from steel it
may be hardened as in case of ordinary solid pinions.
In addition to the advantages named a pinion of the form shown has but a fraction
of the weight of any other kind of pinion, and is especially useful wherever lightness
is an object, as in time mechanism where the action of the train consists of a
continued succession of movements and pauses, and the inertia of parts in starting
and their momentum in stopping, constitute an important element in the operation
of such train.
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 method employed in the forming of pinions, which consists in forcing a disc
of sheet, metal through dies and giving to the same a cup-shaped form with corrugated
sides; substantially as and for the purpose specified.
a
2. The method employed in the forming of pinions which consists in giving
cup-shape to a disc of sheet metal and then passing such blank through drawing
dies until its sides are corrugated and it corresponds externally in size and shape
to the exterior of a toothed pinion, substantially as and for the purpose specified.
3. The method employed in the forming of pinions which consists: first, in cutting
a round blank from a sheet of metal; next in giving to such blank a cup-shape;
next, in corrugating the sides of said blank; and lastly, in forming within the
closed end an opening for the reception of an arbor; substantially as and for the
purpose set forth.
4. As a means for forming pinions from sheet metal a female drawing die which
is provided with a central opening that corresponds in shape to the toothed periphery
of a pinion, in combination with a male die which corresponds to and is adapted to
enter said opening, substantially as and for the purpose specified.
5. As a means for forming pinions from sheet metal a male drawing die and a
female drawing die which by their joint action are adapted to give to a cupped
sheet metal blank the external form of a toothed pinion, in combination with
drawing dies that are adapted to give a cupped form to a sheet metal disc, sub-
stantially as and for the purpose shown.
6. As a means for forming pinions from blanks, the combination of drawing dies

page_text: which are adapted to give a cup form to a sheet metal disc; drawing dies that
are adapted to give to the cup shaped blank the external form of a toothed pinion,
and punching dies which are adapted to form within the closed end of said blank
an opening for the reception of an arbor, substantially as and for the purpose set
forth.
7. As a new article of manufacture, a spur pinion which is composed of a shell of
corrugated metal that interiorly corresponds in shape to its exterior, substantially as
and for the purpose specified.
8. The combination of a shell pinion with an arbor which passes axially through and
is secured within the same, substantially as and for the purpose shown.
9. The combination of a shell pinion with an arbor which passes axially through the
same and fills the space between the points of the internal teeth, substantially as and
for the purpose set forth.
10. The described pinion constructed from sheet metal and having one end open
and its other end partly closed and provided with a central opening which is con-
centric with the periphery of said pinion, substantially as and for the purpose shown
and described.