Year: 1888

page_text: J, WILLIAM ANDREW YOUNG, of Leith, in the County of Midlothian, North Britain,
Engineer, do hereby declare the nature of this invention to be as follows:-
This Invention relates to improvements in the construction of Cranked shafts,
and has for its object to facilitate the making of large cranked shafts, by forming
and mounting them in three pieces, cach same piece being interchangeable so that
in the ordinary course one spare same piece is equivalent to a spare shaft, while
at the same time my improved construction is such as to leave the designer of
the engine the same freedom as he had with solid cranks.
In carrying out my invention I form the crank pin and shaft of separate forgings
or castings which are each fitted into webs or cheeks common to and connecting
both. The cheeks are flat forgings or. castings recessed to receive collars with
which the crank pin, and the shaft, are eached forged or cast, the said collars
being machined to fit true within the recesses of the cheeks, and secured thereto
by bolts and nuts.
Each part of the shaft is thus removable and can be replaced with the ordinary
appliances of an engine room.
My Improvements are especially applicable in the construction of a three throw
crank shaft such as is used for a triple expansion engine but my improvements are
also applicable to double or single cranks, or cranks of any number.
Dated this 23rd day of October 1888.
JOHNSONS,
115, St. Vincent Street, Glasgow,
Petitioner's Agents.

page_text: Improvements in the Construction of Cranked Shafts.
1. WILLIAM ANDREW YOUNG, of Leith, in the County of Midlothian, 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 :-
This Invention relates to improvements in the construction of cranked shafts, and
has for its object to facilitate the making of large cranked shafts, by forming and
mounting the crank in three pieces, each same piece being interchangeable, so that in
the ordinary course one spare same piece is equivalent to a spare shaft, while at the
same time my improved construction is such as to leave the Designer of the Engine
the same freedom as he had with solid cranks.
In carrying out my Invention, I form the crank pin and shaft of separate forgings
or castings which are each fitted into webs or cheeks common to and connecting both.
The cheeks are flat forgings or castings recessed to receive collars with which the
crank pin, and the shaft, are each forged or cast, the said collars being machined to fit
true within the recesses of the cheeks, and secured thereto by bolts and nuts.
Each part of the shaft is thus removable, and can be replaced with the ordinary
appliances of an engine room.
-
And in order that my Invention may be properly understood and readily carried
into effect, I will now proceed to describe the Drawings hereunto annexed. Figure 1.
is a front elevation of a three-throw crank shaft constructed in accordance with my
said invention. Figure 2.-is an end elevation of the same.
The crank pin A, and shaft B, are separate forgings which are each fitted into the
webs or checks C. The said checks for the purpose of receiving the pin and shaft are
and shaft B, are each
recessed to receive the collars a, b, with which the crank pin
;
forged the said collars being machined to fit true within the recesses of the cheeks,
as shown in the Drawings.
In order to brace the crank shaft together, 1 employ bolts and nuts 1), for bolting
together the collars of both the crank pin and shaft, with the webs or checks C; the
arrangement of the said bolting is shown upon one only of the cranks of Figure 1, but
it is to be understood that I employ the same bolting with the other two cranks.
In cases where a series of six or other similar number of bolts D, and bolt holes d,
as shown in figure 2, cannot be conveniently employed, as for example when the crank
is of small throw, I may keep the collars a, intact, and employ a simple bolt and nut
diametrically through the crank pin, such an arrangement I have shown at E, as
applied to one of the cranks in the Drawing, and if desired I may provide a check for
the collar a, within the recess of the check C, in the form of a flat at the side of the
recess or by an ordinary key; under this modification the securing of the shaft collar b
to the same cheek (, may be effected by the ring of bolts and nuts herein befor
described, but in cases where any of the sections of shaft are sufficiently short I may
employ the single bolt arrangement for the sections of shaft as well as for th
rank nin

page_text: Although I have shown in my Drawing, my Invention as applicable to a three-throw
crank it is to be understood that my invention is equally applicable to a shaft having a
single crank or any number of cranks.
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 :-
First In crank shafts for triple compound and other Engines, the arrangement
and construction of detachable crank pins and shaft pieces substantially as hereinbefore
described and shown in accompanying Drawings.
-
Second. The particular arrangement of collars a, and b, of crank pin and shaft
piece respectively, fitting into recesses of a web or check (, substantially as hercin-
before described, and shown in the accompanying Drawings.
Third. In combination with the arrangement as described in the preceeding claim,
the employment of bolts and nuts D, or any modification of the same, such as the bolt
and nut E, substantially as, and for the purposes herein before described, and shown
in the accompanying Drawings.
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