New or Improved Disengaging Motion for Screw-cutting Lathes.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
A New or Improved Disengaging Motion for Screw-cutting Lathes.
I, RICHARD CUNLIFFE, of the Firm of Cunliffe and Croom, Limited, of
Broughton Iron Works, Manchester, Machine Tool Makers, do hereby declare
the nature of my said invention to be as follows:
My said invention has for its object to enable the cutting tool of a screw-
cutting lathe to be automatically arrested after traversing a predetermined dis-
tance, and so be suitable for operating upon objects requiring uniformity of
treatment and relieve the machinist of the responsibility of stopping the tool
at the right moment.
In accordance with my said invention, and as applied more particularly to
lathes with the traversing screw inside the lathe bed, I employ a bar, plate or
rod with one, two or more inclines, or wedge-like projections on each edge or
side, and such bar, plate or rod I place above, or near the segmental nut which
engages the carriage with the screw. One end of the bar, plate or rod I connect
to a link or lever under the control of a suitable hand-wheel and shaft, and by
the movements of said wheel, shaft and link I canse the said bar, plate or rod
to slide to, or fro, and the inclines or wedges on its respective edges to operate
upon two or more studs, or projections on the said segmental nut, or its supporting
box, and thus cause the nut to engage or disengage the screw.
"
To render the action automatic as aforesaid, I provide an adjustable "stop" or
block between the cheeks of the lathe bed, and by the aid of a bolt and nut such
block can be set at various points along the lathe bed. Upon one part of the block
I provide an inclined or curved nose," which is designed to lie in the path of the
end of the said bar, plate, or rod, and, as the carriage is traversed by the nut,
serve to impinge against the plate and, by its resistance, cause the plate to slide
and thus draw the segmental nut out of gear with the screw automatically.
Dated this 15th day of July 1898.
A New or Improved Disengaging Motion for Screw-cutting Lathes.
I. RICHARD CUNLIFFE, of the Firm of Cunliffe and Croom, Limited, of
Broughton Iron Works, Manchester, Machine Tool Makers, do hereby declare
Price Sl

page_text: 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:-
-
My said invention has for its object to provide means whereby the movement
of the cutting tool of a screw-cutting lathe may be automatically arrested after
traversing a predetermined distance and by such means render the lathe highly
suitable for operating upon objects requiring uniformity of treatment and relieve
the attendant or machinist of the responsibility of stopping the tool at the right
moment.
In accordance with my said invention, and as applied more particularly to
lathes with the traversing screw inside the lathe bed, I employ a bar, plate or ro.l
with one, two or more inclines, or wedge-like projections on each edge or side.
Such inclines, bar, plate or rod I place above, or near the segmental nut which
engages the carriage with the screw. One end of the bar, plate or rod I connect
to a link or lever under the control of a suitable hand-wheel and shaft, and
by the movements of the said wheel shaft and link I cause the said bar plate
or rod to slide to-or-fro and the inclines or wedges on its respective edges to
operate upon two or more studs or projections on the said segmental nut or its
supporting box, and thus cause the nut to engage or disengage the screw.
"
To render the action automatic as aforesaid I provide an adjustable "stop"
or block between the cheeks of the lathe bed which block by the aid of a bolt
and nut can be set at various points along the lathe bed, and upon one part of
which I provide an inclined or curved 66
nose which is designed to lie in the
path of the end of the said bar, plate or rod, and as the carriage is traversed by
the nut serve to impinge against the plate and by its resistance cause the plate
to slide and thus draw the segmental nut out of gear with the screw automatically.
In order that my said invention shall be readily understood I have hereunto
annexed a sheet of drawings on which Fig. 1 illustrates a front elevation, and
Fig. 2 a plan of so much of a lathe bed and carriage as is necessary to shew my
invention clearly.
Figs. 3 and 4 shew end views looking towards the right and left hand respec-
tively of Figs. 1 and 2.
(A) is the traversing screw of the lathe and (B) the segmental nub for engaging
therewith and carried by the carriage (C). (D) is the aforesaid rod, bar or plate
with inclines (E) on its respective sides as shewn more clearly in Fig. 2. (F) are
the studs or projections (or abutments) carried by the nub (B) against which the
inclines (E) on bar (D) are designed to operate and thereby move the nut into
and out of engagement with the lathe screw (A).
(G) is the stop or block with inclined nose and affixed to the lathe bed at a
suitable point in relation to the desired traverse of the tool, and against which
the end of plate (1) presses when automatically disengaging the nut (B).
To reengage the nut or dis-engage it by hand I connect the plate. (D) to a
link (H) coupled in turn to a bracket (I) on the part which supports the nut (B),
and to a finger or crank (J) on the spindle of a suitable hand-wheel or winch
by the manipulation of which the plate (D) may be moved to-and-fro independently
of the block (G).
Although shewn and described as applied to lathes with the screw within the
bed, the invention may be applied to lathes with the screw outside the bed.
Having thus 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:
1: In means for stopping the movements of the tool or carriage in screw
cutting lathes, a bar, plate or rod with inclines on its respective edges and a half nut
with studs or projections against which the said inclines serve to operate in
engaging and disengaging the nut with the traversing screw of the lathe, and
an adjustable "stop" or block on the lathe, or link and hand wheel, for operating

page_text: the said rod, substantially as herein set forth and illustrated on the accompanying
drawings.
2: The bar, rod or plate with inclines on its respective edges, as and for the
purposes set forth.
Dated this 15th day of April 1899.
RICHARD CUNLIFFE,
By John G. Wilson & Co., Agents.