Improved Stocks and Dies for Screw-cutting.
Year: 1894

page_text: Date of Application, 6th Sept., 1894
Complete Specification Left, 4th June, 1895-Accepted, 10th Aug., 1895
PROVISIONAL SPECIFICATION.
Improved Stocks and Dies for Screw-cutting.
We, WILLIAM WARD, of High Street, Portishead, Somerset, Marine Engineer,
and THOMAS HENRY COLES, of Brixton Villa, Carnarvon Road, Redland,
Bristol, Managing Ironmonger, do hereby declare the nature of this invention to
be as follows:-
This invention relates to that class of stocks and dies for screw-cutting in
which three dies are employed and are arranged at different points in a circle
about the centre of the body of the stocks.
Under this invention cach die is capable of motion towards and from the centre
of the body of the stocks in channels provided in the body of the stocks. The
dies are advanced simultaneously inwards at will by means of a clamping collar
tapered on the inner face and furnished on the outer with screw-threats taking
into corresponding screw-threads in the body of the stocks. The dies are tapered
at the back, and the arrangement is such that the dies advance as the clamping
collar, which bears upon them behind, is screwed down. A movable guard plate
is placed over the dies and is held by means of pins fitting into locking slots
provided in the plate. Other means for locking or securing the guard plate over
the dies may be adopted. When the guard plate is removed, and the clamping
collar slackened, the dies are free to be moved back and to be taken out of the
stocks.
The same set of dies may, within limits, he used for cutting screw-threads on
bolts, rods or pipes not of equal diameter.
1001
NICHOLAS WATTS,
Bristol, Chartered Patent Agent.
Improved Stocks and Dies for Screw-cutting.
We, WILLIAM WARD, of High Street, Portishead, Somerset, Marine Engineer,
and THOMAS HENRY COLES, of Brixton Villa, Carnarvon Road, Redland,
Bristol, Managing Ironmonger, 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 :-
This invention relates to that class of stocks and dies for screw-cutting in which
three dies are employed and are arranged at different points in a circle about the
centre of the body of the stocks.
Under this invention each die is capable of motion towards and from the centre
of the body of the stocks in channels provided in the body of the stocks. The
dies are advanced to an equal extent simultaneously inwards, at will, by means of
a collar tapered on the inner face and furnished on the outer with screw-threads
taking into corresponding screw-threads in the body of the stocks. The dies are
tapered at the back, and the arrangement is such that the dies advance as the
collar, which bears upon them behind, is screwed down.

page_text: A movable guard plate is placed over the dies. This guard plate is slotted so
as to be readily passed over pins screwed or otherwise secured to the body of the
stocks. The slots are so shaped that the plate is capable of being turned to bring
the narrow part of each slot below the heads of the pins. The plate, which is
easily taken out and put in, prevents the dies from rising in the body of the
stocks.
In the accompanying sheet of drawings,
Fig. 1 represents, partly in plan and partly in section, stocks constructed in
accordance with this invention.
Fig. 2 is a cross-sectional view on the line a, e, Fig. 1.
According to this invention each of the three dies a is capable of motion towards
and from the centre of the body in channels provided in the body.
'
The dies a are inclined at the back, that is to say, they are longer at the base
than at the top.
Bearing against the backs of the dies a is a collar e adapted to screw into the
body and having its inner face inclined.
If the collare be screwed upwards, the dies can be moved outwards. The act
of screwing down the collar e causes each die a to advance simultaneously to an
equal extent towards the centre of the body . On the dies lies a renovable
guard plated, not shewn at Fig. 1, but seen at Fig. 2, and, as detached, in Fig. 3.
The plate is slotted, as seen more particularly at Fig. 3 which represents the
plate in plan. In the plate d are slots which are wider at one part than at the
other. The wider parts enable the plate to be passed over the beads of the pins e
screwed or otherwise secured in the body of the stocks. The plate d as it lies on
the dies can be turned round so as to bring the smaller parts of the slots d' under
the heads of the pins e. The dies are thus prevented from rising in the body b
of the stocks. Other means may be substituted for the plated for preventing
the dies from rising or falling out. The dies are readily removed and different or
similar dies substituted, the plate being first taken out, for which purpose, it
is moved round until the wider parts of the slots are under the heads of the
pins e.
The same set of dies may, within reasonable limits, be used for cutting screw
threads on bolts, rods or pipes of different diameter.
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 :-
Screw-cutting stocks and dies having three dies such as a with inclined backs,
and a collar such as c with inner face inclined to correspond with the angle of
inclination of the back of the dies, or approximately so, the arrangement being
such that by screwing down the said collar in the body of the stocks all the dies
are simultaneously advanced towards one another to an equal and desired extent
in channels provided in the body of the stocks, substantially as herein before
described with reference to the accompanying sheet of drawings.
Dated this 29th day of May 1895.
NICHOLAS WATTS,
Bristol, Chartered Patent Agent.