the Crank Pins of Crank Shafts.
Year: 1887

page_text: Date of Application, 1st July, 1887 . .
Complete. Left, 3rd Apr., 1888
Complete Accepted, 18th May, 1888
the Crank Pins of Crank Shafts.
I, JOSEPH BARROW of the firm of Thomas Shanks and Company of the Union
Iron Works, Johnstone, in the County of Renfrew, North Britain, Engineer do
hereby declare the nature of the said invention for IMPROVEMENTS IN TURNING
LATHES SPECIALLY ADAPTED FOR TURNING THE CRANK PINS OF CRANK SHAFTS to be
as follows:-
This Invention, which relates to improvements in turning lathes specially adapted
for turning the crank pins of crank shafts is also applicable generally for turned work
having projections upon it which projections in clearing the slide rests, necessitate the
tool or tools clamped to them to be considerably overhung, thus reducing their
efficiency.
The Invention consists in attaching to the side of the slide rest a narrow projecting
bracket the foot of which rests upon the slide of the saddle while the top part is planed
to a suitable section upon which is fitted a narrow tool holder sliding thereon and
carrying the tool. This tool holder is attached to the top rest and thereby made to
traverse by the ordinary self acting of the feed motion of the rest. The narrow pro-
jecting bracket being adjustable may be set to any desired distance inwards or
outwards corresponding to the particular piece of work to be turned while the
narrow tool holder for the cutting tool is utilized to surface down the sides of a crank
and turn the crank pin or to act upon other analogous projections or to work in
narrow spaces between the flanges of a crank axle and the side of the web or other
projections which have to clear the slide rests. This Invention by giving the
necessary support to the tool enables it to resist the strains of the cut in such a
manner that the accuracy and amount of work done is thereby increased..
T
1007
J. H. JOHNSON, DAY & JOHNSON,
115, St. Vincent Street, Glasgow,
Petitioner's Agents..

page_text: Improvements in Turning Lathes, Specially Adapted for Turning
the Crank Pins of Crank Shafts.
I, JOSEPH BARROW of the firm of Thomas Shanks and Company of the Union
Iron Works, Johnstone, in the County of Renfrew, North Britain, Engineer 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:-
My Invention, which relates to improvements in turning lathes specially adapted
for turning the crank pins of crank shafts is also applicable generally for turned work
having projections upon it which projections in clearing the slide rests necessitate the
tool or tools clamped to them to be considerably overhung, thus reducing their
efficiency.
My Invention consists in attaching to the side of the slide rest a narrow projecting
bracket, the foot of which rests upon the slide of the saddle while the top part is
planed to a suitable section upon which is fitted a narrow tool holder sliding thereon
and carrying the tool. This tool holder is attached to the top rest and thereby made
to traverse by the ordinary self acting of the feed motion of the rest.
The narrow
projecting bracket being adjustable may be set to any desired distance inwards or
outwards corresponding to the particular piece of work to be turned while the narrow
tool holder for the cutting tool is utilized to surface down the sides of a crank and
turn the crank pin or to act upon other analogous projections or to work in narrow
spaces between the flanges of a crank axle and the side of the web or other projections
which have to clear the slide rests. My Invention by giving the necessary support to
the tool enables it to resist the strains of the cut in such a manner that the accuracy.
and amount of work done is thereby increased.
In order that my said Invention may be properly understood and readily carried
into effect, I have hereunto appended five explanatory sheets of drawings illustrating
my Invention as applied to a crank turning lathe, such parts of the said lathe being
omitted as are not necessary to the understanding of my Invention, in the several
Figures of the annexed drawings corresponding parts are marked with the same
letters of reference.
Figure 1, is a front elevation of the principal parts of a crank lathe shewing my
present improvements applied thereto.
Figure 2, is a plan of the same.
Figure 3, is an elevation of the driving face plate of the lathe on the line a, a,
Figures 1 and 2, and therefore shewing the crank pin in section.
Figure 4, is a side elevation of one of the slide rests of the lathe on an enlarged
scale shewing my improvements attached thereto, Figure 5, being an end elevation of
the same slide rest also shewing my improvements attached, whilst Figure 6, is an
end elevation of the adjacent slide rest of the same lathe placed in its proper relation
to the slide rest shewn at Figure 5, and here given for the purpose of indicating the
manner whereby my improved tool holding apparatus may be transferred from one
slide rest to the other.
In Figures 1, 2 and 3, of the annexed drawings the face plate A, of the lathe is
driven from the spur wheel B, either fixed to or formed in one piece with it and
driven from a pinion acting on the spur wheel B, in the manner usual in such lathes.
The crank pin C, is held between the centres D, and E, of the fast and sliding head

page_text: stocks of the lathe, and the outer portions H, and H', of the crank are held to the
face plate A, and to the sliding head stock by means of the cramping arrangements F,
and the auxiliary crank G, respectively attached to the part H, and H', or for the
purposes of this Invention the ordinary plan of attaching block pieces to the crank
ends with the centres definitely fixed thereon may be used, the central portions being
tightened up between the centres D, and E, by means of the screw jacks I, and J,
respectively as is well understood in order to keep the crank pin from springing
and for maintaining it sufficiently stiff in order to be turned. For the purpose of
still further rendering the crank shaft rigid between the centres E, and D, whilst
being turned the circular wheel guide K, is cramped on to the crank shaft by means
of the cramping screws and jaws shewn at Figures 1, 2 and 3, and which are supported
by the bearing against its periphery of the concave guides L, carried upon the pair of
slide rests M, as shewn and after the manner set forth in the former Specification of
the said Joseph Barrow No. 2959 A.D. 1885.
In the annexed drawings the slide rest marked N, is that which is shewn used for
carrying the apparatus for giving a firm support to the tool a, engaged in turning
the crank (This apparatus consists of the narrow projecting bracket O, figure 1,
and shewn in detail more especially at Figures 4 and 5. This bracket O, is bolted by
the bolts P, to the side of the slide rest and it is formed with the lower foot O', which
gives steadiness to the entire arrangement by resting on the bed Q, at the side of the
upper slide R, of the slide rest, the tool holding slide S, is bolted by the bolt S¹, as
shewn at Figures 4 and 5. The under portion of the forward part of this slide S, is
so shaped as more especially shewn at Figures 1 and 5 to be worked by the action
of the slide rest backwards and forwards upon the upper part of the bracket O.
It will thus be seen that as the upper slide of the rest is drawn to and from the
work to be turned in the ordinary manner by the feeding screw so the auxiliary
rest S, with the tool a, is fed to and from the work and by being firmly supported
on the bracket O, the tool a, although projected out to a considerable extent from
the body of the slide rest is firmly and steadily carried. This rest S, may be worked
to and fro upon the bracket O, by a separate and independent screw but the above
described mode of working it preferred. On referring to Figures 5 and 6, it
will be seen that, when it is required to remove the supporting bracket O, the upper
slide S, and the tool a, from one slide rest to the other all that is necessary is to
remove the bolts P, and S', then to shift the bracket O, with its attachments up
against the slide rest Figure 6, when, by placing the bolts P, and S1, in opposite
directions in their respective holes, the bracket O, and attachment S, they enter
corresponding holes in the slide rest Figure 6, so that when the said bolts are
tightened the said bracket O, and its attachments are firmly secured to the other
slide rest.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In lathes for turning crank shafts or other work having projections upon it, the
attachment to the slide rest or slide rests of a narrow bracket O, firmly supported
upon the slide rest and having a foot resting upon the bed of the lathe and pro-
vided at its upper part with a narrow tool holding slide actuated by the slide rest
or by an independent screw substantially as hereinbefore described and shewn upon
the annexed sheets of drawings.
ST. JOHN V. DAY,
115, St. Vincent Street, Glasgow,
Applicant's Agent.