IMPROVEMENTS IN COMPOUND PACKING FOR STUFFING BOXES
Year: 1882

page_text: LETTERS PATENT to Peter Blair, of Birkenhead, in the County of Chester,
Engineer, for an Invention of "IMPROVEMENTS IN COMPOUND PACKING FOR
STUFFING BOXES,"
PROVISIONAL SPECIFICATION left by the said Peter Blair at the Office
of the Commissioners of Patents on the 4th January 1882.
PETER BLAIR of Birkenhead in the County of Chester Engineer.
MENTS IN COMPOUND PACKING FOR STUFFING BOXES."
" IMPROVE-
The object is to provide an easily used, durable and inexpensive packing which
shall with the minimum of attention and friction fit close to and maintain contact
with the piston rod or moving part so as to prevent the passage of steam or fluid
between the said packing and the piston rod or moving part.
For the above purpose I combine metal and fibrous or like packing in the
following novel manner. The metal packing consists of rings or spiral pieces or
portions thereof increasing in thickness from the interior outwards say of wedge
form and of such a size as to fit close round the walls of the stuffing box. The
fibrous packing preferably circular in cross section is laid round and in contact
with the piston rod or moving part and between the rings or spirals of the metallic
packing.
When the packing is in rings or portions thereof the said rings are by preference
arranged as follows:-One or more rings of fibrous packing is or are placed in the
bottom of the stufting box then alternately a ring of metallic and fibrous packing;
the top ring is of fibrous packing and is acted on by the stuffing gland. As the
gland is forced home the wedge like metallic rings cause the fibrous packing to
press more and more against the piston rod or moving part.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Peter Blair in the Great Seal Patent Office on the 4th July
1882.
PETER BLAIR of Birkenhead in the County of Chester, Engineer. "IMPROVE-
MENTS IN COMPOUND PACKING FOR STUFFING BOXES."
The object is to provide an easily used, durable, and inexpensive packing which
shall with the minimum of attention and friction fit close to and maintain contact
with the piston rod or moving part so as to prevent the passage of steam or fluid
between the said packing and the piston rod or moving part.
For the above purpose I combine metal and fibrous or like packing in the
following novel manner. The metal packing consists of rings or spiral pieces or
portions thereof increasing in thickness from the interior outwards say of wedge
form and of such a size as to fit close round the walls of the stuffing box. The
fibrous packing preferably circular in cross section is laid round and in contact
with the piston rod or moving part and between the rings or spirals of the metallic
packing.
When the packing is in rings or portions thereof the said rings are by preference
arranged as follows: one or more rings of fibrous packing is or are placed in the
bottom of the stuffing box then alternately a ring of metallic and fibrous packing;
the top ring is of fibrous packing and is acted on by the stuffing gland. As the
gland is forced home the wedge like metallic rings cause the fibrous packing to
press more and more against the piston rod or moving part.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a longitudinal section of a common stuffing box and gland containing
my improved compound packing and is applicable to pumps engines and other
machinery. a stuffing box, b gland, c piston rod or moving part, & metal packing
rings [made for convenience of placing in position in two halves as shown in
Fig. 2. The said metal packing is wedge shaped and thinner at the interior than
at the outer circumference, e fibrous packing filling the spaces between the metal
packing rings next the piston rod or moving part c. The fibrous packing is here
shown of woven material, round in section, but other makes and shapes of fibrous
packing may be used.
The metal packing pieces may be parts of a spiral so that the fibrous packing
will be in one length instead of in rings.
Fig. 3 is a sectional view of my improved packing fitted in a stuffing box and
gland for an engine piston rod. a stuffing box b gland, c piston rod, d wedge
shaped metallic packing pieces, e fibrous woven packing triangular in section. Here
suflicient pressure to keep the packing tight is obtained by the steam acting on the
sliding piece f
Fig. is a sectional view of a pump stuffing box containing my improved packing.
a box, b gland, c trunk, d metallic wedge packing nearly circular in section, e fibrous
rope packing square in section.
Fig. 5 is a sectional view of a trunnion stuffing box containing my improved
packing, a box, b gland, c trunnion, d metallic triangular wedge packing pieces,
e asbestos or other tibrous packing.
Fig. 6 is a sectional view of a stuffing box containing my packing and suitable
for a hydraulic accumulator, a box, b glaud, c metallic packing, & fibrous packing,
here three coils of fibrous packing are interposed between the metallic packing ring
and each end of the stuffing box.

page_text: Fig. 7 is a sectional view of an air pump stuffing box containing my improved
compound packing. a box, b gland, c trunk, d metallic packing, c fibrous
packing.
Fig. 8 is a sectional view of my improved packing fitted in a screw shaft or
stern post stuffing box. a stuffing box b gland, c screw shaft, d metallic wedge
shaped packing with convex surfaces, e fibrous packing.
Fig. is a sectional view showing my improved packing applied to a steam
hammer, a stuffing box, b gland, c hammer shaft, d metallic packing, e fibrous
packing.
Having now described and illustrated my said Invention with numerous
modifications which will enable others to carry my improvements into practice, I
claim -
The compound metallic and fibrous packing combined and acting substantially
as herein specified for the purposes set forth.
In witness whereof I the said Peter Blair have hereunto set my hand and
seal this First day of July in the year of our Lord, One thousand eight
hundred and eighty two.
PETER BLAIR. (L.S.)