Improvements in Apparatus for Manufacturing Screw Threads and the like on the Exterior of Bottle Necks.
Year: 1898

page_text: Improvements in Apparatus for Manufacturing Screw Threads and
the like on the Exterior of Bottle Necks.
We, THOMAS WILLIAM SIMPSON, of The Mount, Bottle Manufacturer, and
WILLIAM HENRY BRADSHAW, of Lower Oxford Street, Mechanic, both of Castleford,
in the County of York, do hereby declare the nature of this invention to be as
follows:-
In apparatus of the tongs description hitherto employed in making external
screw threads, two rollers having corresponding recesses or helical grooves in their
surfaces, have been employed, and two rollers, one plain and the other screwed have
been attempted; but in the first case it is difficult and often impossible to form
the thread owing to the difficulty of keeping the rollers in exactly similar paths,
and in the second case the plain roller rolls the thread out as fast as the screw roller
forms it.
The
According to our invention we employ the ordinary tongs carrying a central
mandrel or plug and having two spring arms on opposite sides of same, and on
one of these spring arms a roller is carried having indentations or projections of
suitable shape according to the screw thread required to be produced.
opposite arm of the tongs carries a roller having the major portion of its surface
of a smaller diameter than that of the screw roller, but the upper or lower, or
both of the ends of the said roller, is or are flanged to an equal diameter to that of
the screw roller at its corresponding parts, thus allowing the said smooth roller
to act as a support to the metal under treatment, without injuring the thread as
it is produced by the screw roller. Instead of forming the supporting roller of a
smaller diameter to that of the screw roller, the arm carrying it may be limited
in its movement so as to prevent the surface of the said roller coming sufficiently
near to the plug to injure the screw whilst it is being formed, or the smooth roller
may be dispensed with and a stationary supporting surface or flange can be formed
on the portion of the tongs adjacent to the plug. In this latter case the weight
of the tool can be considerably reduced, as one of the spring arms would be
dispensed with.
Although we have described our invention with reference to the formation of
screw threads, we would have it understood that any other irregular surface could
be formed with equal efficiency.
Dated this 4th day of January, A.D., 1898.

page_text: Improvements in Apparatus for Manufacturing Screw Threads and
the like on the Exterior of Bottle Necks.
We, THOMAS WILLIAM SIMPSON, of The Mount, Bottle Manufacturer, and
WILLIAM HENRY BRADSHAW, of Lower Oxford Street, Mechanic, both of Castleford,
in the County of York, 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:
-
In apparatus of the tongs description hitherto employed in making external
threads on bottle necks, two rollers having corresponding recesses
or helical
grooves in their surfaces have been employed, and two rollers one plain and the
other screwed have been attempted; but in the first case it is difficult and often
impossible to form the thread owing to the difficulty of keeping the rollers in
exactly similar paths, and in the second case the plain roller rolls the thread out
as fast as the screw roller forms it.
.
In order that our invention may be clearly understood, we will proceed to
describe same with reference to the accompanying drawing, in which similar
letters refer to like parts in all the figures.
Figure 1 illustrates tongs constructed according to our invention in the open
position, and Figure 2 illustrates the same tongs in the closed position. Figure 3
illustrates a modification of same.
According to our invention, we employ a pair of tongs.consisting of the ordinary
central spindle A, mandrel or plug B, and spring arms C and D on opposite sides
of the said spindle A; and on the spring arm C a roller E is carried having indenta-
tions F corresponding with the screw thread required to be produced. The spring
arm D carries a roller G having the central portion H of its surface of smaller
diameter than that of the roller E, but the upper and lower portions of the said
roller G are flanged so as to bring it to an equal diameter with that of the screw
roller E at its corresponding parts.
In applying the tongs to a bottle neck for the purpose of forming an external
thread on same, the plug B is inserted in the neck of the bottle and the tongs are
closed by the pressure of the hand. This has the effect of causing the screw
roller E to run with its face in contact with the surface of the bottle neck where it
impresses the screw in the required manner, and the roller G runs with its flanges
in contact with the neck on the opposite side of same, thereby supporting the
metal. The central portion H however, does not touch the metal after the screw
thread has begun to be formed, so the latter is not injured by contact with the
said central portion H.
The sole object of the roller G is to provide a supporting surface for the metal
to prevent it being run out of shape, and whilst the screw thread is being formed
the flanges on the roller G work against the metal without interfering with the
screw. thread. 2. I
'4
The roller G is employed for the purpose of minimizing friction, but there is no
reason why a stationary supporting surface should not be substituted for the
roller G, providing the said stationary surface does not cause too much friction,
and Figure 3 of the accompanying drawing illustrates how this can be carried into
effect. This tool shewn at Figure 3 is practically the same as that shewn at
Figures 1 and 2, except that the roller G is dispensed with and a stationary support-
ing surface J is employed in its place. The stationary surface J is carried in this
instance on the shoulder of the plug B, but it could if desired be carried on a spring
arm, but as in Figure '3 'the supporting surface is only at the base or where the

page_text: lower end of the roller G would be employed, and so the said surface J is carried
on the central spindle for the sake of simplicity and lightness.
Although we have described our invention with reference to the formation of
screw threads, we would have it understood that any other irregular surface could
be formed with equal efficiency.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
1. In a tool for the manufacture of screw threads on the exterior of bottle necks,
composed of a pair of tongs having a central spindle, plug, and two spring arms,
the employment of a screwed roller mounted on the extremity of one arm, in com-
bination with a roller supporting surface, mounted on the other arm, of such a
shape as to support the metal above and below the thread being formed without
touching the said thread portion of the bottle, substantially as set forth.
2. In a tool for the manufacture of screw threads on the exterior of bottle necks,
composed of a central spindle, plug, and a spring arm, the latter carrying a screwed
roller of the form to be imparted to the bottle neck, the employment of a stationary
supporting surface, substantially as set forth.