Improvements in Bolt Screwing Machinery.
Year: 1890

page_text: Date of Application, 7th Aug., 1890
Complete Specification Left, 6th May, 1891-Accepted, 20th June,
1891
PROVISIONAL STECIFICATION.
Improvements in Bolt Screwing Machinery.
I, EDWARD HOLLINGWORTH, of Dobcross Loom Works, Dobcross, in the
County of York, Loom Maker do hereby declare the nature of this invention to be
as follows (which invention has been communicated to me from abroad by George
Webb, of Pawtucket, Rhode Island, one of the United States of America
Engineer) :-
This invention has reference to machinery employed in forming or cutting screw
threads on bolts, the said machinery being capable of self-actingly reversing the
rotary motion of the screwing dies when a sufficient length of thread has been cut
on the bolt, which reversing motion causes the die to withdraw or force the newly
formed screw out of the said die.
The machine comprises any given number of revolving dies and traversing heads,
the latter of which carry the bolt requiring to be screwed, which bolt is first of all
inserted into a non-revolving head, on which being done, the attendant, by operating
a hand lever, causes the said head to slide or advance sufficiently far to insert the
point of the bolt into the revolving die or screw thread cutter, which seizes hold of
the point of the said bolt, and on continuing to revolve it draws or pulls such bolt
further into the die as each thread is formed, until the screw is sufficiently long,
when by mechanism hereinafter explained, the driving strap which causes the die
to revolve, is transferred to another pulley, whereby the rotary motion of the
screwed die is reversed, the action of which unscrews the bolt and expels it from
the die, which newly severed bolt is then removed to make room for another bolt,
the point of which in like manner is inserted into the revolving die by the workman
actuating the hand lever already mentioned, when the screwing and unscrewing or
withdrawal of the bolt is repeated as before, and this goes on with great rapidity,
enabling the workman to turn out a large number of bolts per hour.
The mechanism 1 employ for automatically reversing the rotary motion of the
screwing die consists of a horizontal rod placed underneath but parallel with the
axis of the bolt screwing die. This horizontal rod is supported in the boss of a
vertical rod or bracket, connected to and projecting from underneath the slide
carrying the bolt holding device. The rear end of the horizontal rod is connected
to a lever working on a fulcrum, the upper end of such lever being connected to a
double strap fork for controlling the driving belts. The lower end of the vertical
rod or bracket which supports the front end of the horizontal rod also carries
another horizontal rod, which latter is fixed to the said vertical rod by set screw,
the action of the parts being such that when the screwing die has drawn the bolt
in to its required distance and formed the thread thereon, the rear end of the
second named horizontal rod, which has been made to advance with the slide, comes
into contact with a trigger or small bell crank lever, releasing it from a catch on
the underside of the horizontal rod first mentioned, permitting a compressed spiral
spring inserted into a tube connected to the part which carries the double strap
forks to be released, so as to force the strap forks from their present position, which
reverses the rotary motion of the screwing die, causing it to unscrew and expel the
bolt therefrom, whereupon a flat spring at the back of the trigger forces it into
position to be caught hold of by the catch on the underside of the horizontal rod
first mentioned, to be ready for the next operation of commencing to screw.
When the length of screw to be cut on a bolt has to be changed to be either
shorter or longer, the second horizontal rod carried by the pillar projecting from
the bottom of the slide is adjusted so as to operate the trigger sooner or later,
according to the alteration in the length of the screw to be cut.

page_text: In order to keep the die and the bolt freely and continuously lubricated, oil is
supplied thereto from a tank suitably placed, such oil, after being used, being
caught by a sieve which strains the oil and frees it from the particles of metal dust
caused by the operation of screw cutting, but such oil is twice or thrice strained,
after which it is lifted or put back to the feed tank by a rotary pump, so that it
may be used and re-used.
· Dotad 'this 6th day of Texv 1800
TASKER & CROSSLEY,
Huddersfield, Agents.
COMPLETE SPECIFICATION.
Improvements in Bolt Screwing Machinery.
I, EDWARD HOLLINGWORTH, of Dobcross Loom Works, Dobcross, in the
County of York, Loom Maker, 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 (which invention has been
communicated to me from abroad by George Webb, of Pawtucket, Rhode Island,
one of the United States of America, Engineer):
:-
This invention consists in combining and arranging a new form of machine or
apparatus for forming or cutting screw threads on bolts, the said machinery being
capable of self-actingly reversing the rotary motion of the screwing dies when a
sufficient length of thread has been cut on the bolt, which reversing motion causes
the die to withdraw or to force the newly formed screw out of the said die.
In order that this invention may be more fully understood, I will now describe
the same with reference to the annexed sheet of drawings, wherein Fig. 1 is end
elevation of my improved bolt screwing machine, and Fig. 2 is front elevation of a
portion thereof, as the machine may be made any convenient length and with any.
suitable number of screwing devices. A represents the framework or standard of
the machine B is the fast and B the loose pulleys mounted upon a shaft carrying
a pinion wheel C employed to drive spur wheel D mounted upon shaft E, which
also carries the screwing dies F. A blank or plain bolt to have a screw thread
formed on it is shewn at G, inserted into a slot in the angle-iron holder H connected
to a non-revolving head I mounted upon the bed I which is capable of sliding-to
and from the screwing dies for the purpose of allowing the bolt to be fed to the
screwing die and to be withdrawn' therefrom when a sufficient length of screw has
been cut upon the bolt. The screwing die is made to reverse automatically when a
sufficient length of screw has been formed upon the bolt, by means of mechanism
which I will now describe. A vertical rod projects from the underside of the
sliding bed the lower part of which rod is made with a boss, and supports loosely
one end of a horizontal rod K, the opposite end of such rod being attached to one
end of the vertical lever L. connected to a double strap fork M and M employed
for the purpose of moving the driving belts onto the required driving pulleys. On
the underside of the horizontal rod K is a stop piece or catch N, which when the
dies are forming the screws, abuts against the trigger or bell crank lever O; a
compressed spring P, inserted within a tube Q, in connection with the strap forks,
draws the stop piece N against the trigger 0. An adjustable horizontal rod Ris
fastened by set screw a to the bottom of the vertical rod so that when the bolt
has entered sufficiently far into the screwing die, the sliding head will have advanced
the same distance in the direction of the dic and carried with it the projecting
vertical rod J and the horizontal rod R, causing the point of the latter to come
into contact with the lower end of the trigger O, removing it from the. holding
catch N, whereupon the enclosed spiral spring P will be set free in such a manner
as to operate the strap forks and transfer the driving strap to ampulley revolving in
the opposite direction, whereby the rotary motion of tho dic is automatically
reversed, which reversed rotary motion will unscrew the bolt selfi actingly from the

page_text: die, whereupon the workman removes the screwed bolt from the angle iron and
inserts another blank in its place. By the unscrewing of the bolt G by the die,
the sliding head I recedes to the same extent as it had advanced, carrying with it
the vertical rod J and horizontal rod R whereby the trigger 0 is set at liberty.
The workman then takes hold of handle T and pushes back the slide I¹ so as to
get the screwed bolt quite clear of the dies. In pushing the slide I' backward, the
boss on vertical rod J comes into contact with the set-hoop K on horizontal
rod K, which boss forces the rod K sufficiently backward to bring catch N past
the trigger, which is forced up or into position by the spring S at the back of said
trigger. The backward motion of rod K operates lever L, the upper end of which
compresses the spiral spring P in its tube Q when the machine is ready for the
next operation.
The modus operandi is as follows:-The workınan first of all places a blank bolt G
into the position shewn in Fig. 1, when he takes hold of hand lever T pivoted
at U and forces the handle in the direction of the arrow until the point of the bolt
has been received by the revolving die, when he may leave loose of the handle, as
the die, after getting hold, pulls or draws the bolt into itself as each screw thread
is being formed, and when the screw is sufficiently long, the point of the rod R will
reach the trigger, and remove it from the holding catch N when the compressed
spiral spring P will opérate the strap fork and transfer the strap onto another
pulley, whereby the rotary motion of the die is reversed, which as already explained,
expels the bolt; when another blank is inserted, and this goes on with great
rapidity, enabling the workman to turn out a large number of screwed bolts per
hour.
When the length of screw to be cut on a bolt has to be changed, and made either
shorter or longer, the horizontal rod R is adjusted so as to make it operate the
trigger sooner or later, according to the alteration in the length of the screw to
be cut.
In order to keep the die and bolt freely and continuously lubricated, oil is supplied
thereto from a tank V, being removed from the said tank and conveyed up through
the pipes W and X by means of a revolving pump Y, the oil, after being used,
falling upon the inclined portion of the framework %, running therefrom over the
bridge into the supply tank V, but it is caught by a sieve Z which strains the
oil and frees it from the particles of metal-dust made by the operation of screw-
cutting, after which the sieved oil is drawn up through pipe W by the pump, so
that the oil is used and re-used.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that what I
claim is :-
Firstly. In a bolt screwing machine, the use of a revolving die and an advancing
bolt holder in combination with a self-acting reversing motion, for purposes
described.
Secondly. In a bolt screwing machine having a revolving die and an advancing
bolt holder, the combination therewith of the adjustable rod R for operating a
trigger for changing the rotary motion of the screwing die.
Thirdly. In a bolt screwing machine having a revolving die, together with an
advancing bolt holder and a self acting reversing motion, the combination there-
with of a pump for supplying oil to the screwing die, all arranged as described.
Fourthly. The general combination and arrangement of parts forming my
improved bolt screwing machine substantially as shewn in the drawings and
described in the accompanying Specification.
Dated this 5th day of May 1891.
TASKER & CROSSLEY,
Huddersfield and Halifax, Agents.