IMPROVEMENTS IN THE MANUFACTURE OF SELF-LUBRICATING STEAM PACKING
Year: 1876

page_text: LETTERS PATENT to James Bury, of the City of Manchester, in the County of
Lancaster, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF
SELF-LUBRICATING STEAM PACKING."
Sealed the 29th June 1877, and dated the 30th December 1876.
PROVISIONAL SPECIFICATION left by the said James Bury at the Office of
the Commissioners of Patents on the 30th December 1876.
JAMES BURY, of the City of Manchester, in the County of Lancaster. “IMPROVE-
MENTS IN THE MANUFACTURE OF SELF-LUBRICATING STEAM PACKING."
This Invention relates to the manufacture of a self-lubricating steam packing for
the joints of steam engines, stuffing boxes, and similar purposes, and consists in the
employment of mineral substances, such as soapstone, steatite, or graphite, in com-
bination with fibrous materials, so arranged that there shall be alternate layers of
the dry lubricating material and the fibrous substance, the whole being enclosed in
an outer covering of any suitable material.
This plan of making self-lubricating packing has several very important
advantages over the modes now in use, where the strands are saturated with tho
dry lubricant and then twisted together, or where the lubricant is put entirely in
the centre of the fibrous material forming the core.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Bury in the Great Seal Patent Office on the 30th Juno
1877.
JAMES BURY, of the City of Manchester, in the County of Lancaster.
MENTS IN THE MANUFACTURE OF SELF-LUBRICATING STEAM PACKING."
"IMPROVE-
This Invention relates to the manufacture of self-lubricating steam packing for
the joints of steam engines, stuffing boxes, and similar purposes, and consists in the
employment of dry mineral substance, such as soapstone, steatite, or graphite, in
Price 2d 1

page_text: combination with fibrous materials, arranged as herein-after described, so that there
shall be alternate layers of the dry lubricating material and the fibrous sub-
stance.
In carrying out my Invention I first of all pass a strand or core of fibrous
material through a hopper containing the mineral substance into an ordinary
braiding machine, the yarn or threads from the bobbins catching the core close to
the mouth of the hopper, and binding the mineral substance between it and them-
selves. The desired length of packing being braided it is again passed through the
hopper containing the mineral substance and then through the braiding machine,
thus reciving a second layer of mineral substance and fibrous material, and this
process is continued until the desired thickness of packing is obtained, when an outer
covering of fibrous material is put on by the braiding machine, and it is then ready
for use.
This plan of making self-lubricating packing has several very important
advantages over the modes now in use, amongst which I may name greater
durability and firmness, and easiness of reduction in size, as the packing made
by my plan may be cut down to any size required, and still be as firm as at
first.
Having now described the nature and particulars of my said Invention I desire
it to be understood that I claim, the improvements in the manufacture of self-
lubricating steam packing, substantially as herein-before described.
In witness whereof, I, the said James Bury, have hereunto set my hand
and seal, this 29th day of May, in the year of our Lord One thousand
eight hundred and seventy-seven.