IMPROVEMENTS IN THE CONSTRUCTION OF CRANK SHAFTS
Year: 1881

page_text: LETTERS PATENT to John Dickinson, of Palmer's Hill Engine Works,
Sunderland, in the County of Durham, for an Invention of "IMPROVEMENTS
IN THE CONSTRUCTION OF CRANK SHAFTS."
PROVISIONAL SPECIFICATION left by the said John Dickinson at the Office
of the Commissioners of Patents on the 19th December 1881.
JOHN DICKINSON of Palmers Hill Engine Works Sunderland in the County of
Durham. "IMPROVEMENTS IN THE CONSTRUCTION OF CRANK SHAFTS."
This Invention has for its object improvements in the construction of crank
shafts.
For this purpose I form a crank pin together with its two crank arms in one
casting of steel and on the outer side of each crank arın where the arm is to be
attached to the end of a length of shaft a recess is formed for a disc enlargement
on the end of the length of shaft to enter and fit into. Bolts are passed through
the enlargement of the shaft and through the crank arm to bolt them firmly
together. The bolt heads are taper and are embedded in corresponding holes in
the enlargement of the shaft so that the ends of the bolt heads may be flush
with its exterior. The nuts screwed on to the opposite ends of the bolts bear
against the inner faces of the crank arms and are preferably covered over with
sheet metal guard plates.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Jolin Dickinson in the Great Seal Patent Office on the 19th June
1882.
JOHN DICKINSON of Palmers Hill Engine Works Sunderland in the County of
Durham. "IMPROVEMENTS IN THE CONSTRUCTION OF CRANK SHAFTS."
This Invention has for its object improvements in the construction of crank
shafts.
For this purpose I form a crank pin together with its two crank arms in one
casting of steel and on the outer side of each crank arm where the arm is to be
attached to the end of a length of shaft a recess is formed for a disc enlargement
or coupling on the end of the length of shaft to enter and fit into. Bolts are
passed through the enlargement of the shaft and through the crank arm to bolt
them firmly together. The bolt heads are embedded in corresponding holes in the
enlargement of the shaft so that the ends of the bolt heads may be flush with its
exterior. The nuts screwed on to the opposite ends of the bolts bear against the inner
faces of the crank arms and are preferably covered over with sheet metal guard
plates.
Figure 1-of-the-Drawings-hereunto annexed shews a longitudinal clevation of a
crank shaft constructed as above described. Figure 2 is an end elevation of the
same. The shaft shewn is formed with two cranks at right angles to one another.
Figure 3 is a longitudinal section on a larger scale of a junction of one of the crank
arms with the end of a length of shaft. Figure 4 is an end elevation of the
same.
A is the circular portion of each length of shaft. B are the disc enlargements or
couplings at each end of each length A. C are the crank arms and D the crank
pins. Each crank pin with its two arms is as above stated made in one casting of
steel and on the outer side of each arm where the arm is to be attached to the shaft
a recess is formed for one of the disc enlargements or couplings B to enter and fit
into. Each arm is also formed with a circular hole through it concentric with the
recess this allows of the recesses being turned with greater accuracy to receive the
couplings.
E are the bolts for securing the couplings B to the arms C. F are sheet metal
guards for covering over the nuts G which are screwed on to the ends of the bolts.
If desired the crank arms may be made to balance as shewn at Figures 5 and 6.
Also a hole may be cast or bored in the crank pins so that a pin of hammered steel
may be put in if thought necessary.
Having thus described the nature of my Invention and the manner of performing
the same I would have it understood that I claim
The construction of crank shafts with each crank pin cast in one piece with its
crank arins and with a recess made in the outer side of each arm for disc enlarge-
ments or couplings at the ends of the lengths of shaft to enter and fit into such
disc enlargements or couplings being also secured by bolts to the crank arms
substantially as described.
In witness whereof I the said John Dickinson have hereunto set my hand
and seal this Seventeenth day of June in the year of our Lord One thousand
eight hundred and eighty two.