Improvements in Packings for Piston Rods and the like.
Year: 1893

page_text: Date of Application, 5th May, 1893
Complete Specification Left, 29th Nov.; 1893-Accepted, 30th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Packings for Piston Rods and the like.
We, JOHN HENRY HARGREAVES, JOHN GEORGE HUDSON, and HARRY.
ALFRED RICHARDSON, of The Soho Iron Works, Bolton, in the County of
Lancaster, Engineers, do hereby declare the nature of this invention to be as
follows, that is to say :-
This invention has for its object to improve and simplify the construction and
arrangements of the parts of packings for piston rods and the like, the improved
packings being such as to allow of slight transverse or angular movements of
the rods.
In carrying out the invention the actual stuffing or packing box for a piston or
other rod, is made a separate piece and is placed partly within an outer box or;
neck formed or fixed on the end or cover of the cylinder or casing. The packing
inside the inner box may be of any suitable known kind, either compressible, or.
metallic, or a combination of metallic and compressible material; and such packing
may occupy a space at and near the outer end of the inner box this box being
extended inwards beyond the packing to give length of bearing on the rod; or the
packing may occupy any length of the inner box that may be thought desirable.
In
The inner packing box is secured to the outer box or neck by a ring bolted to
the latter, this fixed ring being made with an inwardly overhanging flange or rim
between which and the end of the outer box or neck there is an annular recess.
the recess there is a ring formed with a flat side to fit steam-tight against a flat,
surface on the inner side of the flange of the fixed ring, and with a spherical side to.
fit steam tight on a spherical surface formed on a flange on the inner box. Outside,
of the fixed ring a helical spring encircles the inner box this spring bearing on the.
fixed ring or on an interposed annular plate. The spring is compressed by a ring,
screwed on the inner box, and it draws the inner box outwards in a manner to make
its spherically shaped flange bear tightly on the ring between that flange and the
flange of the fixed ring. An important feature of the arrangement is the application
of the pressure by means of a spring which is external and externally adjustable..
The inner packing box may be provided with an ordinary gland or other appliance
for compressing the packing within it.
Within the inner packing box we may in some cases adopt an improved
modification of combined metallic, and compressible material, the metallic part in
contact with the rod consisting of a helix or spiral coil instead of a number of.
separate rings or segments, and the compressible materiál being applied between
the outer parts of the convolutions of the metal helix.
Dated this Fourth day of May 1893.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Packings for Piston Rods and the like.
い
11
We, JOHN HENRY HARGREAVES, JOHN GEORGE HUDSON, and HARRY
ALFRED RICHARDSON, of The Soho Iron Works, Bolton, in the County of
Lancaster, Engineers, do hereby declare the nature of this invention and in what
[Price 8d.]

page_text: manner the same is to be performed, to be particularly described and ascertained'
in and by the following statement, that is to say:
ķ
This invention has for its object to improve and simplify the construction and
arrangements of the parts of packings for piston rods and the like, the improved
packings being such as to allow of slight transverse or angular movements of the
rods.
"
In carrying out the invention the actual-stuffing or packing box for a piston or
other rod is made a separate piece and is placed partly within an outer box or neck
formed or fixed on the end or cover of the cylinder or casing, the packing inside
the inner box being of any suitable known kind. The inner packing box is secured
to the outer box or neck by a ring bolted to the latter and outside of this fixed ring
a helical spring is according to one modification arranged to encircle the inner box.
The spring is compressed by a ring screwed on the inner box and it draws the inner
box outwards in a manner to make a spherically shaped flange on it bear tightly
on a ring between that flange and an inwardly overhanging flange on the fixed ring.
The inner packing box may be provided with 'an ordinary gland or other appliance
for compressing the packing within it.
And in order that the said invention and the manner of performing the same may
be properly understood we hereunto append a sheet of explanatory drawings, to be
hereinafter referred to, and showing packings for piston rods and the like as made
according to the invention.
.
Figure, 1, of the drawings is an elevation (half of it being in section) of the
improved packing arrangement,
thep
Figure, 2, being an elevation of a part with a slightly modified detail.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
The actual stuffing or packing box, A, for a piston or other rod, B, is made a
separate piece, and is placed partly within an outer box or neck, C, formed on or
fixed on the end or cover of the cylinder or casing. The packing, D, inside the
inner box, A, may be of any suitable known kind, either compressible, or metallic,
or a combination of metallic and compressible material; and such packing may
occupy a space at and near the outer end of the inner box, A, this box being
extended inwards beyond the packing to give length of bearing on the rod, B,
or the packing may occupy any length of the inner box that may be thought
desirable.
The inner packing box; A, is secured to the outer box, or neck, C, by a ring, E,
bolted to the latter, this fixed ring being made with an inwardly overhanging flange
or rim, G, between which and the end of the outer box or neck there is an internal
annular recess, H. In the recess; H, there is a ring, J, formed with a flat side to
fit steamtight against a flat surface on the inner side of the flange, G, of the fixed
ring, E, and with a spherical side to fit steamtight on a spherical surface, K,
formed on a flange, L, on the inner box, A. Outside of the fixed-ring, E, a helical
spring, M, encircles the inner box, A, (as shown in Figure, 1) this spring bearing
on an interposed annular plate, N, or it might be directly on the fixed ring. The
spring, M, is compressed by a ring, P, screwed on the inner box, A, and it draws
the inner box, A, outwards in a manner to make its spherically shaped flange, L
bear tightly on the ring, J, between that flange and the flange, G, of the fixed
ring, E. An important feature of the arrangement is the application of the
pressure by means of a spring which is external and externally adjustable. The
inner packing box, A, is provided with an ordinary gland, Q, the studs, R, by means
of which the gland is tightened being screwed into a ring, S, screwed on the
packing box, A.
t
Instead of the large helical spring, M, which encircles the inner box, A,
in Figure, 1, there is employed in the modification shown in Figure, 2, a number of
small helical springs, T, spaced equally round the ring, P, and held in recesses, V,
formed in the ring
3.
"..

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The combination of parts constituting the improved packings for piston rods and
the like, substantially as herein before described, an essential feature of the said
combination being the arrangement of a spring or set of springs which is external
and externally adjustable and which draws outwards an inner stuffing box angularly
and transversely movable in an outer box.
Dated this Twenty-eighth day of November 1893.
EDMUND HUNT,
Applicants' Agent.