Improvements in Stuffing Boxes.
Year: 1893

page_text: Date of Application, 11th July, 1893
Complete Specification Left, 10th May, 1894-Accepted, 16th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Stuffing Boxes.
I, GEORGE HENRY HITCHCOCк, of 101, Fairhield Street, Danville, in the
County of Vermilion, and State of Illinois, United States of America, Locomotive
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to construct a steam-tight joint between an
adjustable stuffing box and the cylinder head by means of steam pressure.
My invention consists in the combination, with the stuffing box, of an expansion
ring and an expander ring arranged to expand the expansion ring when acted upon
by steam pressure, thus forming a steam tight joint between the adjustable stuffing
box and the ordinary stuffing box formed on or attached to the cylinder head.
The cylinder head is of the usual construction provided with a counter-bored
central aperture in which is received the ordinary gland, and in which are fitted a
pair of expansible rings placed one on top of the other, the lower ring being made
of soft metal and bevelled on its lower inner surface, thus forming a space between
it and the piston rod, and also between it and the bottom flange of the counter-
bored aperture so that the said lower ring may be pressed forward against
the upper ring and thus form a steam-tight joint between the two rings and between
the upper ring and my improved adjustable stuffing-box. The upper edge of the
lower ring is bevelled or flared outwardly to receive the upper ring whose face is
conical, and as the rings are expansible the outward pressure of steam will cause
them to fit the aperture in which they are placed steam tight.
The adjustable stuffing box consists of a flat ring resting on the upper of the
pair of expansible rings and having a spherically concave upper surface to which is
fitted the lower half of the stuffing-box, the said stuffing-box having a bevelled or
counter-sunk bottom which serves as a seat for the packing contained thereby. The
gland of the stuffing box is fitted to the box, and bevelled or countersunk, so that
it will tend to force a pair of packing cones contained in the stuffing box against
the piston rod. The upper surface of the gland is made spherically convex, and to
this spherically convex surface of the gland is fitted a flat ring, the said ring being
kept in contact with the gland by a follower, which is fitted on screw-rods rising
from the cylinder head.
Dated Tul, 11th 1002
G. H. HITCHCOCK,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
COMPLETE SPECIFICATION.
Improvements in Stuffing Boxes.
I, GEORGE HENRY HITCHCOCK, of 101, Fairhield Street, Danville, in the
County of Vermilion, and State of Illinois, United States of America, Locomotive
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 :-
The object of my invention is to construct a steam-tight joint between an
adjustable stuffing-box and the cylinder-head of a steam engine by means of steam
pressure.
My invention consists in the combination, with the stuffing-box, of an expansion

page_text: ring and an expander ring arranged to expand the expansion ring when acted upon
by steam pressure, thus forming a steam-tight joint between the adjustable stuffing-
box and the ordinary stuffing-box formed on, or attached to, the cylinder head.
Reference is to be had to the accompanying drawing, forming part of this
Specification, in which the figure is a transverse section.
The cylinder head A is of the usual construction. It has a piston rod aperture
of greater diameter than the rod and is provided with a counter-bored central
aperture B designed to receive the ordinary gland. The cylinder head is also
furnished with studs a, having nuts b, a follower C being fitted to the studs a and
provided with a central aperture for receiving the piston rod D. In the counter-
bored central aperture B are fitted the rings E, F, the ring F being made of soft
metal and bevelled on its lower inner surface, thus forming a space between it and
the piston rod and also between it and the bottom flange of the counter-bored
aperture, so that the said ring F may be pressed forward against the ring E and
form a steam-tight joint between the two rings and between the ring E and my
improved adjustable stuffing-box H. The upper surface of the ring F is bevelled
or flared outwardly to receive the conical ring E, and as the said rings E, F, are
made expansible, the outward pressure of the steam will cause them to fit the
aperture B steam-tight.
The adjustable stuffing-box H consists of a flat ring G resting on the ring E and
having a spherically concave upper surface to which is fitted the lower half c of the
stuffing-box, the said stuffing-box having a bevelled or countersunk bottom which
serves as a seat for the packing C₁ contained thereby. The gland d'of the stuffing
box H is fitted to the partc and bevelled or countersunk so that it will tend to force
the packing cones c, d, contained in the stuffing box against the piston rod D.
The upper surface of the gland d is made spherically convex and to this spherically
convex surface of the gland is fitted a flat ring I, the said ring I being kept in
contact with the gland d by the follower C.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination, with the cylinder head provided with a piston rod aperture
of greater diameter than the rod and having a counter bore B, of the two expansible
rings F, E, in the base of the counter bore and of greater internal diameter than
the piston rod and having bevelled engaging surfaces, the lower edge of the ring F
being exposed to the steam within the chamber formed by said rings, the stuffing
box secured to the cylinder head with its lower end closing the upper end of the
steam space formed in the rings E, F, and means for securing the stuffing box in
place, substantially as set forth.
2. The combination, with the cylinder head provided with a piston rod aperture
of greater diameter than the rod and having a counter-bore B, the bevelled
expansion rings E. F. in the lower end of the counter-bore and of greater internal
diameter than the piston rod, thereby forming a steam space to receive steam
through the piston rod opening, the flat ring G resting on the ring E and closing
said steam space, the annular telescopic stuffing box sections c, d, recessed on their
inner walls and forming a packing space, the flat ring I, and the follower C mounted
on the bolts or studs a, substantially as set forth.
3. The combination, with the piston rod stuffing box, of a steam engine, of
concaved rings fitted to the stuffing box and an auxiliary stuffing box having convex
ends fitted to the concave rings, substantially as specified.
Dated this 10th day of Ma, 1894.
G. H. HITCHCOCK,
By A. M. & Wm. Clark,
53, Chancery Lane, London, Chartered Patent Agents.
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