IMPROVEMENTS IN MACHINES FOR MAKING SCREWS
Year: 1875

page_text: LETTERS PATENT to Christopher Miner Spencer, of Hartford, in the
County of Hartford, and State of Connecticut, United States of
America, Manufacturer, for the Invention of "IMPROVEMENTS IN
MACHINES FOR MAKING SCREWS."
Sealed the 21st August 1875, and dated the 10th March 1875.
COMPLETE SPECIFICATION filed by the said Christopher Miner Spencer
at the Office of the Commissioners of Patents, with his Petition and
Declaration, on the 10th March 1875, pursuant to the 9th Section
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHRISTOPHER
MINER SPENCER, of Hartford, in the County of Hartford and State
of Connecticut, United States of America, Manufacturer, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN MACHINES FOR MAKING SCREWS," and have petitioned Her Majesty to
grant unto me, my executors, administrators, and assigns, Her Royal

page_text: Letters Patent for the same, and have made solemn Declaration 'that
I am the true and first Inventor thereof.
7
NOW KNOW YE, that I, the said Christopher Miner Spencer, do
hereby declare that the following Complete Specification, under my
hand and seal; fully describes and ascertains the nature of tho said
Invention, and in what manner the same is to be performed, in and by
the following statement, reference being had to the accompanying
Drawings, where Figure 1 is a top view of a machine embodying my said
improvements; Figure 2 is a side elevation of the same, which I will
term a front view; Figure 3 is a view of the same in vertical cross section
on the plane a, a, looking in the direction denoted by the arrow a¹; Figure
4 is a cross section view on tlie same plane but looking in the opposite
direction.
The machine as a whole is intended for making what are commonly
called "machine screws," that is screws for fastening metallic parts
together.
The Invention is an attachment to or part of such machine for forming
and fashioning the periphery, of the heads of the screws to almost any
desired shape, as round, square, hexagon, octagon, etc. The letter à
denotes the base; b, b, ways for the block c, carrying horizontally
rotating tool stock d; e, e, the standards of the headstock, in which is
hung the hollow shaft frotated by a belt running on the pulley g. The
stock is fed-through-the shaft-f, and caused to. rotate with it: by.
_ appliances which form no_part of the present Invention. The rotary_
tool stock & has sockets for different tools, -as mills for cutting down
the body of the stock to the desired size, and dies for cutting the screw
thread, which can be brought to bear successively upon the stock by the
rotation and longitudinal motion of this tool stock. One of these
sockets bears upon the end of the stub or rod j, the ways block /, in
which the tool stock has longitudinal movement. This tool stock
bears the tool m secured in place by screw n. From this tool stock
extends the tappet o, kept in contact with the periphery of the rotating.
former p on the shaft f, by the spring ". If the former is circular it
will cause the tool m to cut a round head on the screw, if the former is
square the tool m cuts a square head. The former, shown in the
Drawings, is of about the right shape for causing the tool to cut an
hexagon head, and the shape of the former can be varied to cut heads of
almost any shape.
.

page_text: has transverse motion on the base a in ways u, this tool is used to sever
the finished screw from the stock at the
proper time.
I claim as my Invention,―
1. The combination of the rotating stock feeding shaft f, the rotating
former p, and the vibratory tool stock 1, all substantially as shown and
described.
2. The combination of the stock holding shaft f, the rotating former p,
the ways block, the tool stock 1, and the tool m, all substantially as
shown and described.
.
3. The combination of the rotating former p, the vibratory tool
stock, and the cutting-off tool 8, all substantially as shown and
described.
4. The combination of the rotating tool stock d, ways block %, and
vibratory tool stock 2, all substantially as shown and described.
.
In witness whereof, I, the said Christopher Miner Spencer, have
hereunto set my hand and seal, this Twenty-second day of
February, in the year of our Lord One thousand eight hundred
and seventy-five..
CHRISTOPHER MINER SPENCER. (L.s.)
Vitness,
'WILLIAM EDGAR SIMONDS;