IMPROVEMENTS IN THE CONSTRUCTION OF CRANK SHAFTS to be as follows:
Year: 1884

page_text: I, JOHN PERCY HALL, of Mayfield Villa, Jarrow in the County of Durham,
Engineer, do hereby declare the nature of said invention for " IMPROVEMENTS
IN THE CONSTRUCTION OF CRANK SHAFTS to be as follows:-
"
My invention relates to certain modes of constructing crank shafts, whereby the
following advantages are obtained :-
1st The forging is simplified and, especially in the case of heavy shafts, a sounder
shaft is produced.
2nd A certain amount of flexibility is given to the shaft by which it may adjust
itself to irregularity of wear in the bearings thus avoiding injurious strains and
fracture.
3rd A portion only of a shaft may be carried in duplicate: for instance in three
crank engines one spare half and one spare pin or, in two crank engines, one spare
quarter and one spare pin will suffice for any emergency.
According to my invention I make the crank pins, preferably of all the cranks,
separate from the webs which may be forged solid on straight portions of shaft or
may be, as in the case of large shafts, keyed, bolted or otherwise attached to the
straight portions.
The crank pins are formed with a collar or flange at each end fitting into corre-
sponding recesses in the webs which are about inch deeper than the collars on
pins to provide for self-adjustment in case of shaft getting out of true line in
bearings. Beyond the collars the pins are formed with coned necks the holes in
crank web being also coned and the ends of pins beyond, which are about th less
in diameter than the corresponding hole in the crank web are screwed to receive
nuts the necks of which fit freely into recesses in outer faces of crank webs and
the bottoms of these necks are preferably rounded to a radius which admits of slight
movement in their recesses should the shaft get out of true line. The crank pins
are prevented from turning round, by means of keys, or steady pins through the
webs. In another form I propose to make the pins, with a large collar or flange
on each end the outer faces of which, are slightly convex, and the crank webs are
recessed, to receive these collars, the convex faces of which are free to move to a
small extent, upon the flat surfaces, of the recesses, to allow for adjustment in case
of the shaft getting out of true line. Two or more bolts with tapered or plain
heads let into recesses in collars secure each collar into the web by nuts with
recessed necks rounded to a radius at bottoms and these bolts also prevent the pin
turning round,

page_text: CODY LEIE BPECIFICATION.
I JOHN PERCY HALL, of Mayfield Villa, Jarrow in the County of Durham
Engineer, do hereby declare the nature of said invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF CRANK SHAFTS" and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
My invention relates to certain modes of constructing crank shafts, whereby the
following advantages are obtained :-
:-
1st The forging is simplified and, especially in the case of heavy shafts, a sounder
shaft is produced.
2nd A certain amount of flexibility is given to the shaft by which it may adjust
itself to irregularity of wear in the bearings thus avoiding injurious strains and
fracture..
3rd A portion only of a shaft may be carried in duplicate; for instance in three
crank engines one spare half and one spare pin or, in two crank engines, one spare
quarter and one spare pin will suffice for any emergency.
According to my invention I make the crank pins, preferably of all the cranks,
separate from the webs which may be forged solid on straight portions of shaft or
may be, as in the case of large shafts, keyed, bolted or otherwise attached to the
straight portions.
The crank pins are formed with a collar or flange at each end fitting into corre-
sponding recesses in the webs which are about inch deeper than the collars on
pins to provide for self-adjustment in case of shaft getting out of true line in
bearings. Beyond the collars the pins are formed with coned necks the holes in
crank web being also coned and the ends of pins beyond, which are about th less
in diameter than the corresponding hole in the crank web, are screwed to receive
nuts the necks of which fit freely into recesses in outer faces of crank webs and
the bottoms of these necks are preferably rounded to a radius which admits of slight
movement in their recesses should the shaft get out of true line. The crank pins
are prevented from turning round, by means of keys, or steady pins through the
webs.
8
In another form I propose to make the pins, with a large collar or flange on
each end the outer faces of which, may be slightly convex, and the crank webs, are
recessed, to receive these collars, the convex faces of which are free to move 'to
small extent upon the flat surfaces, of the recesses to allow for adjustmont in case
of the shaft getting out of true line. Two or more bolts with tapered or plain
heads let into recesses in collars secure each collar into the web by nuts with
receased necks rounded to a radius at bottoms and these bolts also prevent the pin
turning round.

page_text: Hole in web to be about larger in diameter than pin at d, and recess for nut
also about larger in diameter than recessed part of nut-The surface between
end of nut and web to be slightly spherical-This requires only one shaft and one
pin to be carried as spare.
Figures 3 and 4 shew the invention applied to a 3 throw shaft of the solid
principle; the detail of pin being the same as that of Figure 1 except that collar b
is reduced in diameter to keep down the size of end of web-and to retain sufficient
surface I increase the thickness of collar.
In Figure 1. there is no necessity for keeping down the size of web as it will not
require to be larger than that of the cranks with shrunk in pins.
Figures 9 and 10. shew the invention applied to both pins of a two throw shaft
on the built up principle with couplings in centre.
The detail of pin is same as for Figures 1 and 2 This requires only + shaft and
one pin to be carried as spare.
Figures 11 and 12 shew the invention applied to both pins of a two throw with
couplings in centre but web solid with shaft.
The details of pin are same as Figures 3 and 4.
Figures 5 and 6 shew the second part of my invention applied to a crank shaft
of similar construction to Figures 1 and 2.
In this a is the crank pin, b collar or flange on end recessed into web c and
secured by bolts d. The bolt heads being recessed into collar, and the nuts into
web.
The section Figure 5A is taken at right angles to the plane of the crank for
convenience in shewing bolts.
Figures 7 and 8 shew the second part of my invention applied to a 3 throw
shaft of similar construction to Figures 3 and 4.
In this case the details of pin are same as Figures 5 and 6.
The second part of my invention is also applicable to shafts similar to Figures 9
and 10 and Figures 11 and 12.
My invention may be applied in modified forms by making one end only of the
pin coned and the other end with a collar or flange or by making one end only of
the pin either coned or with a collar or flange and the other end fitted into the crank
web in any of the ordinary modes the interchangeability of the portions of the
shaft being still secured or in cases where interchangeability is not available or not
required the pin may be solid on one web of crank and titted in the other web
according to either method of my invention.
.
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
The construction of crank shafts by the application to all or any of the cranks
of a crank pin constructed fitted and secured substantially as described, and
illustrated by Figures 1, 2, 3, 4, 9, 10, 11 and 12 of drawings or of a crank pin
constructed fitted and secured substantially as described, and illustrated by
Figures 5, 6, 7 and 8 of drawings or of a crank pin constructed of a combination
of the two forms of pin for the purposes set forth or any of them.
St. 1005
Dated
20th
Jay
T..
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Applicant's Agent.