IMPROVEMENTS IN CRANK AXLES FOR STEAM ENGINES
Year: 1884

page_text: I DAVID JOY of 8 Victoria Chambers Westminster Engineer do hereby declare
the nature of said Invention for "IMPROVEMENTS IN CRANK AXLES FOR STEAM
ENGINES" to be as follows :-
My Invention has for its object to provide improved arrangements for.coupling
the crank axles of Steam Engines together whereby the driving strain is taken by
a projection or projections formed on the cranks fitting into and interlocking with
corresponding recesses in the cheese-heads of the main-shafts and in such form
that cach crank or crank axle remains a duplicate the one of the other and each is
removable separately and independently of the other or others and so also that the
bolts used to couple the parts together are relieved from all or most of the driving
strain To effect this I dispense with the usual mode of coupling the cranks by
cheesc-heads between the bearings and I widen one or both of each pair of crank
cheeks so as to receive the cheese-head of the main shaft which I directly connect
to each crank cheek so widened I make a projection or projections on the crank
cheek which interlocks into a corresponding recess or recesses in the cheese head of
the main shaft this projection or these projections taking the driving strain—Or
I face the crank check and cheese-head together with a step or steps (undercut or
not) which takes or take the driving strain.
The connection of the part may be made by a central bolt passed through the
axle and the opposed cheese-head and cheek or in the ordinary manner by bolts
and nuta

page_text: I DAVID JOY of 8 Victoria Chambers Westminster, Engineer do hereby declare
the nature of my invention for "IMPROVEMENTS IN CRANK AXLES FOR STEAM
ENGINES" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
My Invention has for its object to provide improved arrangements for coupling
the crank axles of Steam Engines together whereby the driving strain is taken by
a projection or projections formed on the cranks fitting into and interlocking with
corresponding recesses in the Cheese-heads of the main shafts and in such form
that each crank or crank axle remains a duplicate the one of the other and each is
removable separately and independently of the other or others and so also that the
bolts used to couple the parts together are relieved from all or most of the driving
strain.
My Invention will be clearly understood by the following description with
reference to the accompanying drawing where figures 1 and represent in side and
end views respectively a crank-shaft made up of cranks coupled together on my
plan. In this case each crank cheek A receives a cheese-head B of the shaft, and
the two are coupled together by bolts in the usual manner; but as shown in
Figure 3, which is a section on the line Z Z Figure 1 looking in the direction of
the arrow, the boss C of the crank into which the crank pin is shrunk, is recessed
into the cheese head B. This cheese head and its recess B' are shown separately
in Figure 4.
Or as shewn in Figure 5 the one crank cheek A¹ may be of the ordinary form,
and only the second one A be coupled to a cheese-head B.
Or as shewn in Figures 6 and 7-where the crank shaft is forged or cast in one
piece the coupling is effected in a similar way by the boss C on the outer side of
the crank cheek fitting the recess in the cheese-head, or again as shewn in
Figure 8, 9 and 10 the crank may be either built or forged or cast and the check A
to be coupled be recessed to receive the cheese-head B each contiguous part being
notched or stepped down at D to meet the other and bolted together in the
ordinary way or by one large bolt through the centre.
Figure 8 is a side view of the crank Figure 9 a face view of the crank cheek
and Figure 10 is a side view of the cheese head.
Or as shewn in figures 11, 12 and 13 (the parts A A being built or forged or cast
into the main shaft in the ordinary way) the coupling is made by cheese-
heads E¹ E¹ on the crank pins E E fitting into recesses Â¹ on the crank checks (seo
the face view of the part A in Figure 13).
In each of these arrangements it will be noted that the parts to be coupled have
corresponding projections and recesses for supporting the driving strain and
relieving the coupling bolts.
And in each the arrangement is such that the complete crank shaft can be made
up of a number of pieces which are duplicates of each other and inter-changeable,

page_text: Having now 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
In cranks of steam Engines where a cheese-head is coupled direct to the cheek
of the crank, a projection or projections on the one, interlocking or engaging with
a recess or recesses on the other, to receive and sustain the shock and strain of
driving, and relieve the coupling bolts.