IMPROVEMENTS IN SCREW STOCKS FOR FORMING THREADS
Year: 1884

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I JOHN EDWARD WALSH of Waterhouse Chambers Crossley Street Halifax in
the County of York Patent Agent and Consulting Engineer do hereby declare the
nature of my Invention for IMPROVEMENTS IN SCREW STOCKS FOR FORMING
THREADS," a communication to me from abroad by Carl Christian Flamme of. Hof,
Bavaria, to be as follows:-
:-
The object of my improved stock is to cut screws at one cut, and make them
with little exertion, and to be able to lift off the screw stock from the screw when
cut without turning it back.
I construct my improved screw stock as follows it is made with five dies, and
provided with a cover screwed fast on, and a moveable cover.
I employ a spindle upon which is a worm which operates a toothed ring, giving
it a circular motion, the ring has oblique recesses in its inside against which the
ends of the dies rest and which when motion is imparted to the ring by means of
the worm, moves forward the whole of the dies uniformly, each die has an angular
slot a moveable disc covers the whole, on the moveable disc are pins which fit into
the slots or recesses in the dies, there is a lever or pin in the disc which when
moved turns the disc, and the pins come in contact with the angles of the slots in
the dies, and the dies are moved back, and so the screw stock can be lifted from
the screw without turning back the dies by means of the worm.
In addition to the great advantage this screw stock offers, in being able to turn
out with one cutting down, a perfectly complete thread, the sets of dies are so
adjusted, that by moving a pin from one hole to another hole nearer the centre of
the dies, a different size of screw can be made.
*

page_text: COMPLETE SPECIFICATION...
...
I JOHN EDWARD WALSH of Waterhouse Chambers Crossley Street Halifax in
the County of York, Patent Agent and Consulting Engineer do hereby declare the
nature of my said invention for "IMPROVEMENTS IN SCREW STOCKS FOR FORMING
THREADS," a communication to me from abroad by Carl Christian Flamme of Hof
in Bavaria, Engineer and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:
I
The purpose of the thread-screw-stock is to cut down screws at one time, to
make them ready with little exertion and to be able to lift off the screw-stock from
the screw when cut without being obliged to turn it back. The accompanying
drawings represents such a thread screw-stock cutting with five dies a... and
provided with a cover d screwed on fast and a movable cover e in or below the
cover d. By means of the spindle set into the worm a centrical motion of the
ring c is effected which owing to the slanting surfaces ... attached to c causes
the forward motion of the dies a... Owing to the grooves b... made in a and to
the catching of the notches r... set in the movable cover e, it is rendered possible
to shove back the dies, as by a quarter turn of the lever n contained in the three-
corner-shaped hole a centrical motion is effected, the purpose of which is to lift the
screw-stock from the screw when it is cut so that it is not necessary to turn it
back in the thread.
In addition to the great advantage, (which) this screw stock offers in being
able to turn out with one cutting down a perfectly complete thread the sets of dies
are so adjusted that on putting the pin x into the common bored holek in d, t and c
a normal size of screw is attained.
Having now particularly described and ascertained the nature of my_said
invention, and in what manner the same-is-to-be-performed, I declare that what
_I-claim-is-
In a thread-screw-stock the moveable cover e, and the notches rrrrr (by which
on turning the lever n the dies a... are pushed so far back that the screw-stock can
be raised from the cut screw) in combination with the pins, which regulate the
normal position of the dies.
Dated this sixteenth day of March 100K