IMPROVEMENTS IN BEARINGS FOR. MACHINERY for Bearings for Machinery.
Year: 1885

page_text: CHARLES JACKSON Engineer 134 Robin Hood Chase Nottingham do hereby
declare the nature of my invention for IMPROVEMENTS IN BEARINGS FOR. MACHINERY
to be as follows:-
The object of this invention is the application of Hardened Asbestos as a
substitute for the materials used at the present time for Bearings for Machinery.
Dated this Seventh day of Antahan 100%
I CHARLES JACKSON Engineer of 134 Robin Hood Chase Nottingham 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:-
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a
The object of this invention is the application of hardened asbestos as
substitute for the materials used at the present time for bearings for machinery.
In order that my said invention may be fully understood and readily carried
into effect I will proceed to describe the method which I prefer.

page_text: I take asbestos fibre spun into a yarn or thread and I saturate it with shellac
dissolved in spirit. I then dry it say for about a week in a drying shed through
which a current of air passes. I then weave the threads or yarns into a fabric
either alone or with fine threads of silk cotton or other fibre forming the warp.
I saturate the fabric again with the shellac solution and return it to the drying shed
until it appears thoroughly dry and hard. This operation may be repeated if it be
-desired that the finished article shall be very hard and dense. I prepare a metal
mould to the form of the bearing lining or piece which-I-desire-to-make; this form
will usually be the same as that of the brass bearing lining in which at present
axes and shafts are commonly arranged to revolve so that my asbestos bearing
lining may take the place of the ordinary brass.
I now cut pieces from the prepared fabric and by means of shellac solution I put
them together side by side with considerable pressure. In this way I gradually
build up the bearing lining approximately to the form required but somewhat
larger than the finished article is required to be. In this building up care should
be taken that the asbestos fibre is arranged as nearly as may be radially to the
shaft so that the frictional contact of the shaft is with the ends of the fibres.
When the bearing lining has been thus built up and is apparently dry it is
submitted to heavy pressure in the mould. A pressure of several tons to the inch
should be used. The moulded article is afterwards placed in an oven heated about
to 250 degrees Fahrenheit and here it remains for 8 or ten hours. On coming out
of the oven the bearing lining is again put into the mould which now is heated to
between 300 and 400 degrees and the article is now exposed in the heated mould
to the heaviest pressure available-a powerful press is requisite for this operation.
After pressing the bearing lining is returned to the oven which is now heated to
about 350 degrees and it is kept at this temperature for 8 or 10 hours. The
bearing lining is then ready for use.
In place of weaving the asbestos fibre into a fabric I can although less advan-
tageously operate in like manner with loose fibre.
If it be desired metal in the form of strips or otherwise may be embedded in
the asbestos forming the bearing lining.
The process above described admits of variation without departing from the
spirit of my invention; I have described the process as I prefer to conduct it and
I would state that this process for hardening asbestos is the subject of another
patent granted to me bearing the number 11976 and of even date with the patent
of which the present is the specification.
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
My improvements in bearings for machinery which consist in forming them or
such parts of them as come into contact with the shaft or axis of hardened
asbestos.