Improvements in Packing for Stuffing Boxes.
Year: 1892

page_text: Date of Application, 26th Mar., 1892
Complete Specification Left, 23rd Dec., 1892-Accepted, 28th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Packing for Stuffing Boxes.
I NORMAN MACBETH of the Victoria Foundry, Bolton, in the County of
Lancaster, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates principally or more particularly to packing adapted for
application within the stuffing boxes of steam engines or prime movers.
Letters Patent Number 15898 of the year 1888 have been granted to me for an
invention of Improvements in stuffing boxes" and the object of my present
invention has been to produce a packing more suitable for use in my improved
stuffing boxes than the packing materials hitherto sold for like uses. In the
production of my improved packing I make or obtain lead piping drawn thinner
than the ordinary piping of corresponding sizes and I fill lengths of such piping
with spheres of lead or of an alloy consisting principally of lead or of a suitable
alloy which can be cheaply converted into spheres. For the purpose of my invention
I find hard lead shot to be very suitable.
When the piping has been filled with shot as aforesaid I pour in melted wax or
a melted mixture of waxes or of wax and fat or fatty acid or stearine or other fat
or fatty acid which will set at ordinary temperatures.
Such matter fills the interstices and when set keeps the shot in place so
that the piping can be cut into such lengths as may be required without the
shot running out of the piping. Blacklead or any other suitable matter, powder or
substance may be added to the melted wax fat or mixture if considered to be
desirable.
In some cases I subject the piping when filled in the manner herein set forth to a
hammering or rolling process or to both processes whereby the packing is extended
and the thickness of the piping is reduced. I close the ends of the length of piping,
to prevent escape of the contents. The piping may then be rolled and treated as if
it were a solid bar. I may use piping made of an alloy of lead and tin or of lead
and other suitable metal or metals:
I am aware that the use of lead piping for packing stuffing boxes has been
proposed and also that it has been proposed to place shot in stuffing boxes both.
loose and enclosed in bags of woven material.
Dated this 25th day of March 1892.
E. K. DUTTON & Co.,
5, John Dalton Street, Manchester, Agents.
COMPLETE SPECIFICATION.
Improvements in Packing for Stuffing Boxes.
I NORMAN MACBETH of the Victoria Foundry, Bolton, in the County of
Lancaster, Engineer, 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 and accompanying drawings:-
My invention relates principally or more particularly to packing adapted for
application within the stuffing boxes of steam engines or prime movers.
Letters Patent Number 15898 of the year 1888 have been granted to me for an
invention of "Improvements in stuffing boxes" and the object of my present
invention has been to produce a packing more suitable for use in my improved
[Price 81

page_text: stuffing boxes than the packing materials hitherto sold for like uses.
In the pro-
duction of my improved packing I make or obtain lead piping drawn thinner than
the ordinary piping of corresponding sizes.
As ordinary lead piping is not thin enough for my purpose I make or procure to
be made piping of a suitable degree of thickness. By way of example I will state
that I have used piping of of an inch internal and 1 inch external diameter.
Such thin piping requires a greater pressure for its production so that presses of
extra power and strength are required.
When
I fill lengths of such piping with spheres of lead or of an alloy consisting princi-
pally of lead or of a suitable alloy which can be cheaply converted into spheres.
For the purpose of my invention I find hard lead shot to be very suitable.
the piping has been filled with shot as aforesaid I pour in melted wax or a
melted mixture of waxes or of wax and fat or fatty acid or stearine or other fat or
fatty acid which will set at ordinary temperatures. Such matter fills the interstices
and when set keeps the shot in place so that the piping can be cut into such lengths
as may be required without the shot running out of the piping. Blacklead or any
other suitable matter, powder or substance may be added to the melted wax fat or
mixture if considered to be desirable.
In some cases I subject the piping when filled in the manner herein set forth to a
hammering or rolling process or to both processes whereby the packing is extended
and the thickness of the piping is reduced. I close the ends of the length of piping
to prevent escape of the contents. The piping may then be rolled and treated as if
it were a solid bar. I may use piping made of an alloy of lead and tin or of lead
and other suitable metal or metals.
The attached drawing illustrates the application of my improved packing..
In the drawing a represent ordinary metal packing rings and brings made of my
improved packing. These rings are made by cutting suitable lengths of the
packing and bending them into a ring form. Such rings are introduced into the
stuffing box alternately with the rings a.
When the gland is tightened up the rings 6 take the forms of the annular spaces:
between the rings a and by filling such spaces make a steam tight packing.
By substituting these rings b for the ordinary metal rings a great saving in cost
of production is effected for the reason that the labour required to obtain accurate:
fitting together of the ordinary rings is saved.
I may reverse the relative positions of the rings a and b.
I am aware that the use of lead piping for packing stuffing boxes has been.
proposed and also that it has been proposed to place shot in stuffing boxes both loose
and enclosed in bags of woven material.
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 packing of the nature and manner of production and adapted to be used
for the purpose substantially as set forth.
2.) A stuffing box packing consisting of thin lead or soft alloy piping filled
with shot or small metallic spheres and with melted matter substantially as set
forth.
3.) A stuffing box packing consisting of thin lead or soft alloy piping filled
with shot or small metallic spheres and with melted matter and rolled beaten or
drawn out substantially as set forth.
Dated this 22nd day of December 1892.
E. K. DUTTON & Co.,
5, John Dalton Street, Manchester, Agents..