IMPROVEMENTS IN SCREW STOCKS
Year: 1876

page_text: LETTERS PATENT to John George Hammond, of Birmingham, in the County of
Warwick, Manufacturer, and Thomas Trenery. Lecher, of Birmingham, afore-
said, Manufacturer, for the Invention of "IMPROVEMENTS IN SCREW STOCKS."
PROVISIONAL SPECIFICATION left by the said John George Hammond and
Thomas Trenery Lecher at the Office of the Commissioners of Patents on the
6th July 1876.
JOHN GEORGE HAMMOND, of Birmingham, in the County of Warwick, Manufac-
turer, and THOMAS TRENERY LECHER, of Birmingham, aforesaid, Manufacturer.
"IMPROVEMENTS IN SCREW STOCKS."
Our said Invention consists of the improvements in screw stocks herein-after
described, by which improvements the screw stock is made light and portable. It
has few parts and no loose ones, and it can be adjusted for cutting screws of different
sizes very easily and very quickly.
The
We arrange the parts of the screw stock as follows:-The box for the reception
of the screw dies is rectangular, and of a length about double its width. The dies
we employ are of the kind called square dies, each side of each die having a different
screw thread, so that with one pair of dies four sizes of screws can be cut.
dies when dropped into the box are secured therein by a plate secured to the box
by screws passing through slots in the plate. One of the handles of the screw stock
is made in one piece with the box, the other handle is connected with the box by
ineans of its screwed end taking into a concave screw in the end of the box. Within
the box and between its end and the moveable die is a plate of steel. When the
separable handle is turned so as to drive home its screwed end in the end of the
box, the said screwed end of the moveable handle bears against and advances the
plate of steel described. The said plate of steel bearing against the moveable die
presses it with the required force to effect the cutting of a screw
on the rod or
cylinder situated between it and the fixed die.
When it is required to arrange the dies for cutting a screw of a different size
from that for the cutting of which tho dies are arranged, it is only necessary to
slacken the screws by which the covering plate of the box is held down. By now
sliding the plate the wide ends of the slots through which the screws pass are
[Price 6d.]

page_text: brought under the heads of the screws, and the plate can be removed. The dies
are removed and turned into the required position in the box and the covering plate
replaced and fixed.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John George Hammond and Thomas Trenery Lecher in the Great
Seal Patent Office on the 2nd January 1877.
JOHN GEORGE HAMMOND, of Birmingham, in the County of Warwick, Manufac-
turer, and THOMAS TRENERY LECHER, of Birmingham, aforesaid, Manufacturer.
"IMPROVEMENTS IN SCREW STOCKS."
Our said Invention consists of the improvements in screw stocks herein-after
described, by which improvements the screw stock is made light and portable. It
has few parts and no loose ones, and it can be adjusted for cutting screws of
different sizes very easily and very quickly.
We arrange the parts of the screw stock as follows:-The box for the reception
of the screw dies is rectangular and of a length about double its width. The dies
we employ are of the kind called square dies, each side of each die having a different
screw thread, so that with one pair of dies four sizes of screws can be cut. The
dies when dropped into the box are secured therein by a plate secured to the box
by screws passing through slots in the plate. One of the handles of the screw stock
is made in one piece with the box, the other handle is connected with the box by
means of its screwed end taking into a concave screw in the end of the box.
Within the box and between its end and the moveable die is a plate of steel. When
the separable handle is turned so as to drive home its screwed end in the end of the
box the said screwed end of the moveable handle bears against and advances the
plate of steel described. The said plate of steel bearing against the moveable die
presses it with the required force to effect the cutting of a screw on the rod or
cylinder situated between it and the fixed die.
When it is required to arrange the dies for cutting a screw of a different size
from that for the cutting of which the dies are arranged, it is only necessary to
slacken the screws by which the covering plate of the box is held down. By now
sliding the plate the wide ends of the slots through which the screws pass are
brought under the heads of the screws, and the plate can be removed.
The dies are
removed and turned into the required position in the box and the covering plate
replaced and fixed.
•
By unscrewing the moveable handle the screw stock is made very portable.
By modifying the screwing dies, or using a plain pair of dies with V notches or
plain surfaces, the screw stock may be used for holding screw taps.
Figure 1 of the accompanying Drawing represents in plan with the covering
plate removed, and Figure 2 the same with the covering plate attached, a screw
stock made according to our Invention; Figure 3 is a side elevation of Figure 2;
and Figure 4 is a longitudinal section of the same; Figure 5 is a cross section of
the same taken through the box and dies; Figure 6 represents the pair of dies
which we use in combination with the stock for cutting a screw, and also for holding
a screw tap for tapping nuts and other articles; and Figure 7 represents a pair of
plain dies for holding a screw tap in the screw stock.
The same letters of reference indicate the same parts in the several Figures of the
Drawing.
a is the box of the screw stock having the long rectangular figure represented,
the inner sides of the said box a being square or flat, as best seen in the cross section
Figure 5. The bottom of the box a is formed by the plate b, the said plate being
brazed or rivetted to the under side of the frame of the box b; c, d, are the square
dies we use, each side of each die having a different screw thread upon it, so that

page_text: with one pair of dies four sizes of screws may be cut. The dies c, d, when dropped
into the box a fit closely against the square or flat sides of the box a, the said dies
being supported on the bottom b of the said box. The dies c, d, are secured in the
box b by the covering plate e (see Figure 2), and the latter is fastened in its place on
the box by the stems of the screw pins f, f, taking into the narrow parts of the slots g, g,
in the plate e, and driving home the said screw pins. By slackening the screw pins
and sliding the said covering plate e so that the wide ends of the slots g, g, come under
the heads of the screw pins f, f, the said plate e may be lifted from the stock and
the dies removed and turned in the box a so as to arrange a different pair of faces
for cutting another sized screw; h, i, are the handles of the screw stock, the handle
h being made in one piece with the box a, and the other handle is connected with
the opposite end of the box a by its screwed end taking into a concave screw 2³
in the end of the box a. The said screwed handle i serves to advance and hold the
moveable died of the pair of dies c, d, to its place in the box a. The inner or
screwed end of the handle i bears against the cross sliding steel plate k and the
latter against the moveable die d, as represented in Figure 1. By turning the
handle i, so as to drive home its screwed end in the box a, the said screwed end
advances the plate k, and the latter the die d, and holds it firmly against the rod or
cylinder upon which a screw is to be cut, as is well understood. When the moveable
handle is unscrewed from the box a the screw stock is made very portable.
When the screw stock is to be used for holding a screw tap we use in the box a
a pair of square plain dies having on opposite faces V notches, as represented in
Figure 7, or one of the faces of each of the pair of screwing dies may be provided
with a V notch, as represented in Figure 6. When the V notches of the plain pair
of dies, Figure 7, or the screwing dies, Figure 6, are arranged in the box a so as to
be presented to each other, a square or rectangular space is left between them, in
which space the screw tap is firmly held when the moveable die is driven home by
turning the handle i. Or the plain or flat sides of the dies, Figure 7, may be used
for holding taps with flat heads.
Having now described the nature of our Invention, and the manner in which the
same is to be performed, we wish it to be understood that we do not limit ourselves
to the precise details herein described and illustrated, as the same may be varied
without departing from the nature of our Invention; but we claim as our Invention
the improvements in screw stocks herein-before described and illustrated in the
accompanying Drawing, that is to say, the combination of the square or flat sided
continuous box a in which square screwing dies are used with the direct acting
screwed handle i for acting upon the moveable die through a cross plate of steel
sliding in the said box, substantially as described and illustrated, also the com-
bination with the said screw stock of the covering plate e and of the dies having V
or notched or plain or flat sides for holding a screw tap in the stock.
In witness whereof, we, the said John George Hammond and Thomas Trenery
Lecher, have hereunto set our hands and seals, this Twenty-eighth day of
December, in the year of our Lord One thousand eight hundred and seventy-
six
Witness,
RICHARD SKERRETT,
Clerk to George Shaw,
Birmingham.
(L.S.)
JOHN GEORGE HAMMOND.
THOMAS TRENERY LECHER. (L.S.)