IMPROVEMENTS IN ASBESTOS PACKING
Year: 1881

page_text: LETTERS PATENT to Charles James Allport, of the City of London, Engineer,
and Alfred Hollings, of Manchester, in the County of Lancaster, Engineer, for
an Invention of "IMPROVEMENTS IN ASBESTOS PACKING."
PROVISIONAL SPECIFICATION left by the said Charles James Allport and
Alfred Hollings at the Office of the Commissioners of Patents on the 5th
August 1881.
CHARLES JAMES ALLPORT, of the City of London, Engineer, and ALFRED
HOLLINGS, of Manchester, in the County of Lancaster, Engineer. "IMPROVEMENTS
IN ASBESTOS PACKING."
The object of our Invention is to provide an asbestos woven coated packing
suitable for steam glands and heated joints generally, superior to the packings
heretofore in use, in respect of, amongst other advantages, (1) combined elasticity
and firmness; (2) fine bearing surface and reduced friction on the rod or article to
be packed; and (3) ease of and economy in manufacture.
For that purpose we form a core of any desired number and size of strands to
nake up a packing of the required dimensions. Around the said core, the strands
of which are parallel or only slightly twisted, we weave a covering consisting of
comparatively large diameter warp and fine woof or weft. During weaving the
weft is drawn tight. In that way the core is sufficiently compacted, and the
surface of the finished article is left with round projections of warp only for bearing
on the rod when the packing is in position, say, in a gland. The fine weft being
at the bottom of the depressions between the projections does not come into contact
with the article packed until after excessive wear has taken place.
Although we have spoken of our packing as asbestos packing it will be evident
that other fibres may be used in some parts, such as silk for the fine weft.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles James Allport and Alfred Hollings in the Great Seal
Patent Office on the 3rd February 1882.
CHARLES JAMES ALLPORT, of the City of London, Engineer, and ALFRED
HOLLINGS, of Manchester, in the County of Lancaster, Engineer. "IMPROVEMENTS
IN ASBESTOS PACKING."
The object of our Invention is to provide an asbestos woven coated packing
suitable for steam glands and heated joints generally, superior to the packings
heretofore in use, in respect of, amongst other advantages, (1) combined elasticity
and firmness; (2 fine bearing surface and reduced friction on the rod or article to
be packed; and (3) ease of and economy in manufacture.
For that purpose we form a core of any desired number and size of strands to
make up a packing of the required dimensions. Around the said core, the strands
of which are parallel or only slightly twisted, we weave a covering consisting of
comparatively large diameter warp and fine woof or weft. During weaving the
weft. is drawn tight. In that way the core is sufficiently compacted, and the
surface of the finished article is left with round projections of warp only for bearing
on the rod when the packing is in position, say, in a gland. The fine weft being
at the bottom of the depressions between the projections does not come into contact
with the article packed until after excessive wear has taken place.
Although we have spoken of our packing as asbestos packing it will be evident
that other fibres may be used in some parts, such as silk for the fine weft.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a side view, and Fig. 2 a cross section, of our improved packing. a are
central strands or a core of asbestos or other fibres laid parallel to each other, and
surrounded and held in position by the covering b. The covering b is composed of
longitudinal large diameter warp strands or threads of asbestos fibre c, and small
diameter woof or weft strands or threads d. The woof or weft strands or threads d
are tightly drawn, so as to form and lie at the bottom of depressions e; the said
strands or threads are therefore out of contact with the wearing surfaces, and will
keep the covering together until it is nearly worn out.
Fig. 3 is a longitudinal view of a modification of packing in which the core
strands a are twisted spirally.
The covering b may be woven in a suitable circular loom.
Having now described and illustrated the nature of the said Invention in such
manner that others will be enabled to carry our improvements into effect, we
claim,―
First. So called asbestos packing, constructed with core a and covering b, disposed
and combined substantially as herein set forth.
Second. A covering for asbestos or fibrous packing, composed of longitudinal or
warp strands or threads a in combination with weft or woof strands or threads b,
substantially as herein set forth.
In witness whereof, I, the said Alfred Hollings, have hereunto set my hand
and seal, this Second day of February, in the year of our Lord One
thousand eight hundred and eighty two.