IMPROVEMENTS IN MACHINERY FOR MANUFACTURING SAWS."
Year: 1878

page_text: LETTERS PATENT to William Emery Nickerson, of the State of Massachusetts,
of the United States of America, for the Invention of "IMPROVEMENTS IN
MACHINERY FOR MANUFACTURING SAWS."
aled the 8th March 1878, and dated the 22nd January 1878
COMPLETE SPECIFICATION filed by the said William Emery Nickerson at
the Office of the Commissioners of Patents on the 22nd January 1878.
"
WILLIAM EMERY NICKERSON, of the State of Massachusetts, of the United States
of America. "IMPROVEMENTS IN MACHINERY FOR MANUFACTURING SAWS."
Figures 1, 2, 3, and 4 relate to mechanism for making or aiding in making what
is termed a circular saw," Figure 1 being a top view, and Figure 2 a side elevation
of the serrated male die and saw plate supporter, to be herein-after described;
Figure 3 is a lower end view, and Figure 4 a side elevation of the tubular female
die to operate with the said male die.
The machine is to cut from a plate during a downward movement of the female
die on the male die, or during an upward movement of the latter within the former,
a circular saw with all its teeth, the plate being interposed between and firmly held
by the two serrated or ribbed portions of the male die.
In the aforesaid Drawings A and B are the said two serrated or ribbed portions
of the male die, each having a transverse section corresponding in shape with that
of a saw to be made, in which case each may be said to be a cylinder having
projecting from its circumference a series of triangular prismatic ribs a, a, a, arranged
at equal distances apart. The lower portion B is supported on or fixed to a base C, and
there is a prismatic aperture b going axially through each of the said die portions.
A correspondingly prismatic bolt D goes down through the said apertures, and has
its head resting on the top of the upper die portion A. The bolt extends below the
base, and has a slot c to receive a key or wedge d, which on being driven into the
slot and against the base serves to cause the bolt to be drawn downward.
Preparatory to a plate being reduced to the form of a saw, such plate having an
eye made through it at its central part, is to be placed between the two die portions
A, B, after which their connecting bolt should be run through them, and the eye of
ID 13 1

page_text: the plate and the key should be driven into the bolt, so as to cause the plate to be
held firmly to and between the two die portions A, B, the plate being supposed to
have a diameter equal to, if not greater than that of each of such portions.
The female die, shown at E, consists of a strong steel tube fluted or grooved on
its inner periphery to correspond with and receive the ribs of the male die, such
being as shown at e, e, e, in Figures 3 and 4.
The lower end of the female die may be square to the axis, or it may be bevelled
or helically curved, as shown in Figure 4, the latter being the preferable con-
struction.
After a saw plate may have been fixed, as described, in the male die, or between
its two portions A, B, such male die is to be forced upward into the female die, or
the latter is to receive the male die, and to be forced downward upon it, so as to
shear or cut away from the plate all of it projecting beyond the male die.
The part
left between the portions A, B, will be the saw to be produced, the teeth of which
may be afterwards set and finished as circumstances may require.
From the above it will be seen that with my machine circular saws can be
rapidly made, as all the teeth of one are produced simultaneously or successively
during one axial movement of either die relatively to the other and the plate, as
described.
In case the female die has its lower end square with its axis, all the teeth will be
simultaneously made; but when such lower end is bevelled-helically, the-teeth will
be successively cut, all being formed during one movement of the die.
Figures 5 and 6 relate to mechanism for manufacturing or aiding in manufacturing
"straight" or "band saws;" Figure 5 being a top view, and Figure 6 being a front
elevation of a machine for such purpose.
In the said Figures last mentioned A and B are the two serrated or ribbed
portions of the male die for holding the plate or band to be converted into a saw,
the serrations a being curved to radii, whose centre corresponds with that of the
fulcrum of a lever E, arranged as shown, and having projecting from its inner side
corresponding serrations or ribs b to pass between those of the die plates A, B.
The plate A has or should have suitable mechanism for forcing it down upon a saw
plate, so as to clamp it firmly between the plates A, B. In Figure 6 of the Drawings
these devices are represented as slotted bars N, N, cams O, O, for depressing them,
and cams P, P, for raising them.
On a saw plate being arranged and held firmly between the plates A, B, and the
lever E being moved downward sufficiently, the teeth will be successively formed by
the parts separated from the plate by such lever and its serrations or ribs.
I claim the machine, substantially as described, for making circular saws, it con-
sisting of the tubular and channelled female die E and the ribbed male die composed
of the portions A and B and their clamping bolt or devices, all being constructed
and to operate essentially as set forth.
I also claim the machine, substantially as described, for making straight or band
saws, it consisting of the ribbed lever and plates and mechanism for supporting
such lever and plates, and operating the upper one, substantially as specified.
In witness whereof, I, the said William Emery Nickerson, have hereunto set
my hand and seal, this Third day of January, 1878,