Improvements in the Construction of Hollow or Tubular Shafting.
Year: 1890

page_text: Date of Application, 5th Feb., 1890
Complete Specification Left, 5th Nov., 1890-Accepted, 13th Dec., 1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by GEORGE HENRY OGILVY, of 115, East 114th Street,
New York, United States of America.]
Improvements in the Construction of Hollow or Tubular Shafting.
I, GEORGE CROYDON MARKS, a member of the firm of Marks and Clerk, of
31 Temple Street, Birmingham, in the County of Warwick, Consulting Engineers
and Patent Agents, do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to construct hollow or tubular shafting for steam
engines, steamship propellers and machinery generally, in a manner that shall be more
readily and economically carried into effect than by the usual and ordinary methods
of constructing solid shafting.
In carrying my invention into effect I employ either wrought iron or steel, or any
other suitable material. In constructing a hollow shaft from wrought iron I obtain
a bar of that material of the required length, breadth and thickness, which I make
into the form of a half tube, either by heating the bar and passing it through suitable
rolls or by means of presses or any other well-known mechanical arrangement for
effecting a like purpose. I then plane or machine the edges of this half tube until
they make a level surface with each other, and, at certain intervals along each edge of
the half tube, I form recesses by cutting away the metal below the level surface of the
tuhe edges, so that these edges when completed, consist of a series of elevated
and depressed surfaces.
I then form a second half tube in precisely the same manner as the first, and of
similar dimensions, the elevations formed in the half tube edges fit into the depressions
of the first half tube whilst the elevations in the first half tube fit into the depressions
of the second half of the tube.
Having obtained these two half tubes, and fitted them to each other I secure them
together temporarily by means of collars and set screws, or clips. or any other
ordinary well known method, and then turn the tube thus formed in the lathe, until it
is brought down to nearly the required size.
After having thus formed the inner portion or what may term the case of my
shaft, at certain distances or intervals I shrink iron or other metal rings or hoops over
this inner or half lapped tube; so that they may securely hold the lapped or butted
portions firmly together. I shrink any desired number of rings hoops or collars
on to the inner portion and sometimes utilize them as bearings or journals upon which
the shaft may revolve in ordinary bearing brackets.
I also weld or shrink on any projecting portion of metal in the form of a flange
ring or outer case to suit any particular requirement.
Dated this 4th day of Fahru 1200
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Hollow or Tubular Shafting.
I, GEORGE CROYDON MARKS, a member of the firm of Marks and Clerk, of
13 Temple Street, Birmingham, in the County of Warwick, Consulting Engineer and
Patent Agents, 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:-
The object of my invention is to construct hollow or tubular shafting for steam
engines, steamship propellers and machinery generally, in a manner that shall be
more readily and economically carried into effect than by the usual and ordinary
methods of constructing solid shafting.
In carrying my invention into effect I employ either wrought iron or steel or any
other suitable material. In constructing a hollow shaft from wrought iron I obtain
a bar of that material of the required length, breadth, and thickness, which I make
into the form of a half tabe, either by heating the bar and passing it through suitable
rolls, or by means of presses or any other well known mechanical arrangement, for
effecting a like purpose. I then plane or machine the edges of this half tube until
they make a level surface with each other, and, ai certain intervals along each edge of
the half tube, I form recesses by cutting away the metal below the level surface of the
tube edges, so that these edges, when completed, consist of a series of elevated and
depressed surfaces.
I then form a second half tube in precisely the same manner as the first; and of
similar dimensions, the elevations formed in the half tube edges fit into the depressions
of the first half tube, whilst the elevations in the first half tube fit into the depressions
of the second half of the tube.
Having obtained these two half tubes, and fitted them to each other secure them
together temporarily by means of collars and set screws, or clips, or any other ordinary
well known method, and then turn the tube thus formed in the lathe, until it is brought
down to nearly the required size.
After having thus formed the inner portion or what I may term the case of my
shaft, at certain distances or intervals I shrink iron or other metal rings or hoops over
this inner or half lapped tube, so that they may securely hold the tapped or butted
portions together. I shrink any desired number of rings, hoops or collars on to the
inner portion, and sometimes utilize them as bearings or journals upon which the shaft
may revolve in ordinary bearing brackets. I also weld or shrink on any projecting
portion of metal in the form of a flange ring or outer case to suit any particular
requirement.
In order that my invention and the method of carrying the same into effect may be
more readily understood, I append hereunto two sheets of explanatory drawings.
Referring to sheet 1, Figure 1 is a front elevation and Figure 2 an end elevation
of my improved tubular shafting. The two half tubes A A (Figures 1 and 2) are
held together by the iron or other metal rings or collars B B, shrunk on or otherwise
connected with the half tubes forming the shaft. The edges of each half tube are
formed of elevated and depressed surfaces as shown at CCC, Figure 1; the
depressions of the one half exactly fitting over the elevated portions of the other half
tube, so that the two parts when they are brought together and secured by the binding
rings or collars, or other suitable method, form one complete circular shaft having an
even surface around the whole of its circumference.
Figure 3 is a plan of one half tube and Figure 4 a plan of the corresponding portion
required to make up the complete shaft, and showing how the elevated surfaces of the
one half are made to coincide exactly with the depressed surfaces on the other half of
the hollow shaft.
Figure 5 is a front elevation showing one length of my improved tubular shafting D,
having a flange E shrunk or firmly secured upon it for the purpose of connecting
it to the flange E¹ of another length of shafting D¹. A journal F is also formed out

page_text: of the same piece of metal as the flange E' for the purpose of running or working
in the pedestal or bearing G.
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 :-
1. The construction of hollow circular shafting substantially as hereinbefore
described and for the purposes set forth.
II. The construction of circular shafting with bearings or journals formed upon the
same substantially in the manner and for the purposes set forth.
Dated this 4th day of November 1890.
MARKS & CLERK,
13, Temple Street, Birmingham, Agents for Applicant.