AN IMPROVED AUTOMATIC NUT SCREWING MACHINE
Year: 1871

page_text: LETTERS PATENT to John Tagell, of Smethwick, in the County of
Stafford, Engineer and Machinist, for the Invention of "AN
IMPROVED AUTOMATIC NUT SCREWING MACHINE.”
Sealed the 9th April 1872, and dated the 10th October 1871.
PROVISIONAL SPECIFICATION left by the said John Tagell at the
Office of the Commissioners of Patents, with his Petition, on the
10th October 1871.
I, JOHN TAGELL, of Smethwick, in the County of Stafford, Engineer
5 and Machinist, do hereby declare the nature of the said Invention for
"AN IMPROVED AUTOMATIC NUT SCREWING MACHINE," to be as follows :-
-
I provide a hopper into which the nuts are thrown, and by their own
weight fall towards a grooved plate, grooved to the size of the nuts to
be screwed. On one side of this grooved plate I fix a tipper to displace
the nuts should they fall cross-cornered to the grooved plate. I fix a
hollow spindle in suitable bearings on a frame fixed upon stands. On
this hollow spindle I fix an eccentric, on which works a connecting rod

page_text: "the machine stops"
displaces such nut and places another, and so on until all are done, “ or
the tap becomes dull;" and when such is the case,
until its wants are attended to.
SPECIFICATION in pursuance of the conditious of the Letters Patent,
filed by the said John Tagell in the Great Seal Patent Office, on
the 10th April 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
TAGELL, of Smethwick, in the County of Stafford, Engineer and'
Machinist, send grecting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing dato tho Tenth day of October, in the year
of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and successors,.
give and grant unto me, the said John Tagell, Her special licenco
that I, the said John Tagell, my executors, administrators, and
assigns, or such others as I, the said John Tagell, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "AN IMPROVED
AUTOMATIC NUT SCREWING MACHINE," upon the condition (amongst others)
that I, the said John Tagell, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said John Tagell, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by

page_text: of which are marked by corresponding letters and figures of reference :-
Fig. 1 is an end view of my machine. Fig. 2, side or front view of'
the same. Fig. 3, a plan.
Fig. 4, a view, shewing concentric dies c, c, holding nut in place
while screwing, with the cams E acting upon such dies.
'
Fig. 5 shews two adjustable collars T, between which is shewn
levers Iº.
Fig. 6 shews coiled or other springs F, F, to bring back the dies
c, c, and to liberate the nut when tapped, which is effected by the
reverse action of the cams E, in Fig. 4.
A, in Figs. 1 and 2 is a vertical hopper into which the nuts are
thrown promiscously, and by there own weight fall towards a grooved
plate B, Fig. 4, which is made the same size as and to allow the nut
to fall freely; this plate B has to be changed to suit the various sized
nuts to be tapped. On one side of the grooved plate B, and on the
same side of the hopper A is fixed a tipper N, in Fig. 1, to 'displace the
nuts should they fall cross-cornered to the grooved plate B. As the
end of this tipper is lifted upwards it operates on one corner of the nut.
until the sides of the nut becomes parallel with the grooved plate B..
D' shews in dotted lines a hollow spindle on which is keyed
eccentric S, on which is ring and connecting rod R³, and connected with.
levers I", working on a fixed studs in bracket K". At the other end of
levers I" is an elongated hole into which works a stud, which is adjust-
able on tipper lever N, see Fig. 1, such lever works in brackets K³, and ¦
an elongated hole in hopper A, and thus lovers the nuts at every
revolution of machine. In the hopper A, at the bottom of the grooved
plate B, are placed a pair of concentric dies c, c, as shewn in Fig. 4,
which slide at right angles to the grooved plate B, and tap spindle D,
into which the nuts fall to be tapped. The dies c, c, are moved;
forward by the cams E, E, as shown in Fig. 4, which cams press the
dies c, c, against the sides of the nut u to be tapped, which will
compensate for any variation in size of nut. The said dies c, c, are
brought back by the coiled springs or other mechanical equivalent,
shewn in F, F, Fig. 6, which allow the nuts to fall into trough G, when
tapped.
-

page_text: On the cam shaft H, at one end is fixed a lever I, on which is a
balance weight J. On the other end of this shaft H is fixed another
lever I', which is moved by the return motion of the tap spindle D, by
means of adjustable collars T, as shewn in Fig. 5.
When the tap spindle D is moving towards the nut to be tapped, the
concentric dies c, c, are closed against the sides of the nut by means of
the cams E, E, and balance weight on lever I, which by its own weight
presses the dies c, c, against the sides of the nut to be tapped. The
tap spindle D, as shewn in Fig. 2 is moved backward and forward
by means of pullies L, or other equivalent.
:
On the cross shaft H' are fixed two forked strap levers M, M, which
operate on two straps for driving the machine; one straight and the
other crossed. The two outside pullies L are run loose on the hollow
spindle D. The centre or pulley L is keyed firmly on to such spindle.
On the cross shaft H* is fixed a lever I' on the outside of the frame P,
and connected with the lever I by connecting rod R, as in Fig. 2.
On this said shaft H³ is at the other end a lever with balanco weight,
adjustable for poising the strap fork levers M to give the reverse motion
to the machine, such reverse motion being given by lever I 5 and adjustable.
collars T, Fig. 2. The tap spindle D is driven by hollow spindle D³,
as shewn in Fig. 2; such tap spindle sliding in hollow spindle and
connected at the outer end to screw V, the pitch of which will be made
to correspond with the thread on the tap used, and changed when
another size is required; the machine is driven by the before-men-
tioned cross and straight bands from pulley L, revolving in bearings
G. The above regulator screw V works into a nut W, having a shoulder
✗, pressing against Y' on bracket K; this nut has a sliding action
outward, but is kept in place from turning round by a fast key and
groove. A lever I° is pressed against this nut, being keyed on to shaft.
H', on the outer end of which is keyed lever 1', with sliding balance
weight I'. When the tap becomes too dull and the pressure is too great
for the safe working of the tap the regulator nut W is pressed against
the lever I by reason of the end of the tap refusing its work; thus the
nut W gives way and throws over the lever I' and balance I' to an
opposite angle to that shewn; the back of lever I' falling on to support
piece O, the nut naturally comes out of the boss Yo, and nothing is
broken or injured, the nut revolving with the screw V and tap spindle..
As the tap spindle D moves backwards the adjustable collar T presses.
I

page_text: against lever I', such lever being keyed on the cross shaft H*, on the
other end of which is keyed lover Iº, and is connected with lever I by
rod R'; lever I being keyed on one end of shaft H³. On the other end
of such shaft is koyed lever I". The end of this lever presses against
the tipper spindle D³, being acted upon at the proper moment forces &
out the nut when tapped and prevents more than one nut dropping at
a time. The tipper spindle is brought back by a coiled spring F',
or other equivalent.
Having fully described the nature and actions of my machine in
detail, I will now describe its performance :---
.
At the commencement of the forward action of the tap spindle, the
tipper spindle D³ is kept forward in the place where the nut should be
while tapping by means of connecting rod R³; it is thus kept to prevent
a nut droping through untapped, while the tap is geting beyond the
last tapped nut, and the reversed motion has brought the end of the 1
tap near enough to the box to prevent one from droping out untapped;
at such a moment the tipper spindle retires, allowing a nut to drop in
its place, when the concentric dies c close upon it, the tap enters,
scrows it; at such moment it is tapped the balanco weight on cross
shaft H', poising to change the straps its motion is reversed instantly
by the balance weight falling on the other side, thereby carrying strap
forks M, M, and straps with them. The other reverse motion is effected
by the same means and in the same way.
Having described minutely the nature of my Invention, and how
it is carried into practical effect, I wish it to be distinctly understood?
that I do not confine myself to the precise details I have had occasion
to describe and refer to, as many variations may be made without
deviating from the principles of my said Invention; but what I claim as
secured to me hercin is,―
First. The concentric dies c, c; coiled springs, or equivalent for a
bringing back such dies, substantially as and for the purposes herein
set forth.
Second. The cams E, E, and method of closing dies c, c, by levers
I and I, and balance weight I.
Third. The arrangements of guide screw V, nut W, levers I and I', a
and balance weight I³ to allow the nut W to slide out of the bracket
boss Yo to prevent the breaking of the taps.

page_text: Fourth. The tipper spindle D' and arrangements for forcing out the
nut when tapped and for preventing others passing untapped.
Fifth. The arrangement of tipper levers and connections for righting
the nuts in the hopper.
Sixth and last. The general arrangements and combinations of parts
before mentioned as and for the purposes herein-before described and
illustrated.
In witness whereof, I, the said John Tagell, have hereunto set
my hand and seal, this Sixth day of April, in the year of our
Lord One thousand eight hundred and seventy-two.
Witness,
JOHN LEWIS,
Engineer and Patent Agent,
Preston,
Lancashire.
JOHN TAGELL. (L.s.)