IMPROVEMENTS IN CRANK SHAFTS AND CRANK AXLES
Year: 1884

page_text: I, HENRY FOSTER, of 55, Northcote Street Newcastle-upon-Tyne, in the County
of the same City, Engineer, do hereby declare the nature of my Invention for
"IMPROVEMENTS IN CRANK SHAFTS AND CRANK AXLES" to be as follows:-
In the construction of a crank shaft or crank axle I form a crank pin, together
with its two crank arms, in one forging of steel or iron, and through each crank
arm where the arm is to be attached to the end of a length of shaft, I bore a hole
for the end of a length of shaft to enter and fit into.
I then heat the two crank arms to a suitable temperature, and contract them on
to the ends of the lengths of shaft, and further secure them by means of keys.
The end of each length of shaft at its junction with the crank arm, is made
somewhat larger in diameter than the other part of the shaft of which it forms
a part, so as to enable the keys which secure the crank arms to the ends of the
lengths of shaft, to be driven in from the outside of the crank arms.
The second part of my Invention is to provide a means by which ordinary
crank shafts, or crank axles, made from one block or piece of metal, can be
repaired and made in every way fit for further use, when such crank shafts or
crank axles have been fractured at the crank pin or crank arms.
For this purpose I cut away the fractured crank arms and crank-pin, and replace
them by another crank pin together with the two crank arms, in one forging of
steel or iron; holes having been bored in the crank arms for the ends of the
lengths of shaft to enter and fit into; the crank arms are then heated to a suitable
temperature and contracted on to the ends of the lengths of shaft not fractured,
and further secured to the same by means of keys as herein previously described.
The object of this Invention is to provide crank shafts, and crank axles, so
constructed that the said crank shafts, or crank axles, may be more quickly
manufactured, and at the same time be cheaper and more durable than those
heretofore in use, and also to provide a means by which crank shafts, or crank
axles, which have been fractured at the crank pin or crank arms, can be repaired
and made in every way suited for further use.
Dated this Seventh day of January 1884

page_text: I, HENRY FOSTER, of 55 Northcote Street, Newcastle-upon-Tyne in the County
of the same City Engineer, do .hereby declare the nature of my Invention for
"IMPROVEMENTS IN CRANK SHAFTS AND CRANK AXLES," and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
In the construction of a crank shaft or crank axle, I form a crank pin together
with its two crank arms in one piece of steel or iron, and through each crank arm,
where the arm is to be attached to the end of a length of shaft, I bore a hole for
the end of a length of shaft to enter and fit into.
I then heat the two crank arms, to a suitable temperature, and contract them on
to the ends of the lengths of shaft, and further secure them by means of keys.
The end of each length of shaft at its junction with the crank-arm, is made
somewhat larger in diameter than the other part of the shaft of which it forms a
part, so as to enable the keys which secure the crank arms to the ends of the
lengths of shaft, to be driven in from the outside of the crank arms.
The second part of my Invention is to provide a means, by which ordinary
crank shafts, or crank axles, made from one block or piece of metal can be repaired
and made in every way fit for further use, when such crank shafts or crank axles
have been fractured at the crank pin, or crank arms.
For this purpose I cut away the fractured crank arms and crank pin, and replace
them by another crank pin together with the two crank arms in one piece of steel
or iron; holes having been bored in the crank arms for the ends of the lengths of
shaft to enter and fit into; the crank arms are then heated to a suitable
temperature and contracted on to the ends of the lengths of shaft not fractured,
and further secured by means of keys, as herein previously described.
The object of this Invention is to provide crank shafts, and crank axles, so
constructed that the said crank shafts, or crank axles, may be more quickly
manufactured, and at the same time be cheaper, and more durable than those
heretofore in use, and also to provide a means by which crank shafts or crank
axles which have been fractured at the crank pin or crank arms can be repaired,
and made in every way suited for further use.
Having now explained the nature of my Invention for " Improvements in
Crank Shafts and Crank Axles I will now proceed to particularly describe in
what manner the same is to be carried into effect, by the aid of the following
Drawings.
Fig. 1 shows a double throw crank shaft, with the crank pins A. A. together
with the crank arms B. B, B. B, in one piece, contracted on to the ends of the
lengths of shaft C. C. C, and firmly secured to the same by means of keys; the
ends of the lengths of shaft C. C. C, at their junction with the crank arms, being
made somewhat larger in diameter than the other part of shaft of which they
form a part, to allow the keys to be driven in from the outside, in the direction of
the arrows.
Fig. 2 shows 'a crank fractured at d, d; the arms and pin shown in dotted
lines, having been cut away, are replaced by another crank pin A, together with
its two crank arms B. B, in one piece.
The crank arms having been heated to a suitable temperature, are contracted on
to the ends of the lengths of shaft C. C, and further secured by means of keys.
Fig. 3 shows a crank similar to Fig. 2, after having been repaired and made fit
for further usa.

page_text: Fig. 4 illustrates a crank in which the ends of the lengths of shaft C. C, at
their junction with the crank arms B. B, are formed with collars, to prevent the
ends of the lengths of shaft C. C, being forced through the crank arms B. B.
Fig. 5 illustrates a crank in which one arm only is secured to the end of a
length of shaft; the other arm being made in one piece with the length of shaft
adjacent to it.
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:
1 Securing the arms of a crank, together with their crank pin made in one
piece to the ends of the lengths of shaft forming the main body of a crank shaft,
or crank axle, by means of keys of any desired number or forin, as illustrated in
the accompanying Drawings.
2nd Repairing crank shafts, or crank axles, which have been over-strained or
broken at the crank arms or crank pin; by cutting off portions of the crank arms,
and substituting other crank pins together with their respective crank arms in one
picce; and securing them by means of keys, to the ends of the lengths of shaft
forming the main body of the crank shaft, or crank axle, as herein before set forth.
Dated this 9th day of August 1884.