A NEW OR IMPROVED SCREW STOCK
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by William Henry Beck at the Office of
the Commissioners of Patents on the 6th October 1879. A communication
from abroad by Charles Alexandre Furon, of Paris, in the Republic of France,
Blacksmith.
WILLIAM HENRY BECK, of 139, Cannon Street, in the City of London,
Consulting Engineer and Patent Agent. "A NEW OR IMPROVED SCREW STOCK."
[A communication from abroad by Charles Alexandre Furon, of Paris, in the
Republic of France, Blacksmith.]
This new or improved screw stock differs essentially from thoso heretofore
known, and allows of the performance of special work which cannot be done
practically by the ordinary arrangements of screw stock; for example, the
formation of screw threads on bolts which are placed near one another and on the
same level, as in the spring bridles (brides de ressorts) of carriages in plummer
blocks, etcetera, which is very inconvenient with the ordinary screw stock.
In this screw stock the plane of the working levers or handles is placed at a
greater or less distance above that of the cage in which the screwing dies are fitted,
according to the nature of the work intended to be done. The working levers or
handles and the aforesaid cage may be in one piece and made of malleable cast iron,
steel, or other suitable metal; they form a kind of T, which has the base above a
cylindrical crown slotted to form a rectangular mortice, the axis of which lies
in the vertical plane passing through the axis of the working levers or handles.
Into this mortice the screwing dies are fitted as truly as possible.
Between the aforesaid mortice and the working levers or handles I form a
vertical slot, which, leaving a shoulder at the top of the cage, receives two pieces of
malleable cast iron, wrought iron, or steel, the chief purpose of which is to press
upon the external faces of the screwing dies in order to feed them forward.
For this purpose the said pieces are pivoted upon axes, and are acted upon by
the descent of a feed screw working in a tapped hole formed in the vertical axial
line of the screw stock, and furnished at its head with a lever or other means for
tightening it up.
The aforesaid pieces constitute a kind of jaws operated by the said feed screw,
which separates them at their upper ends by means of its conical extremity, and
presses their lower ends against the screwing dies, holding them firmly, and
tightening them up as may be required by a simultaneous action.

page_text: The jaws are of such dimensions and shapes as may be necessary to receive the
separating thrust of the feed screw, and to transform the same into a closing in upon
the screwing dies. They may be easily removed from the slot into which they are
fitted for the insertion or removal of the screwing dies. Other arrangements may
be employed for this purpose, such as, for example, a screwed plate which may be
substituted for the cylindrical base of the cage.
An opening should be formed perpendicularly to the mortice and above it for
the purpose of introducing a lubricant, and for the inspection of the screw thread
in course of formation.
From the above description the industrial importance of the Invention will be
readily understood, for the above described screw stock will screw perfectly and
quickly without inconvenience or difficulty any bolt which may be situated near
another and on the same level.
The separation of the screwing dies may be effected by pushing them outwards
with the finger, or with any suitable instrument, or by means of the jaws them-
selves, which for that purpose may be jointed or hinged to the said dies.
Finally, if the length to be screwed should be considerable, the feed screw may
be made hollow through its longitudinal axis for the passage of the bolt, or the
screw stock may be arranged in such manner that the two jaws may be
simultaneously separated (ecarté), or one of them only, the other remaining fixed
or being suppressed, and leaving instead of the tapped hole for the feed screw
a smooth hole into which passes the bolt to be screwed.