Improvements in Packing Rings for Pistons and Circular Valves of Steam and other Motive Power Engines, and for Pump Buckets or Plungers and other similar purposes.
Year: 1890

page_text: Date of Application, 24th Dec., 1990
Complete Specification Left, 24th Sept., 1991-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Packing Rings for Pistons and Circular Valves of
Steam and other Motive Power Engines, and for Pump Buckets
or Plungers and other similar purposes.
I, CEMER THOMAS COLEBROOK, Engineer, of Union Square, Islington, in
the County of London, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in packing rings for the pistons and.
circular valves of steam and other motive power engines, also for pump buckets or
plungers, and other similar purposes.
The invention has for its object the making of a more perfect elastic contact
between the inner wall of the cylinder or casing (hereinafter referred to as the
cylinder) and the piston, plunger, bucket or valve as the case may be, (hereinafter
referred to as the piston,) and in which the packing rings are placed in order to
prevent any escape of the steam, air, gas, water or other fluid or liquid, between
the adjacent surfaces of the cylinder and piston while at work, without unduly
increasing the friction or reducing the wearing surface.
an
Many forms of metallic packing rings, and various other devices for giving
outward pressure to the packing rings have been devised from the plain Ramsbottom
rings to others of very complicated and expensive character, all striving to obtain
the aforesaid object but with indifferent success.
In the simpler forms hitherto in use, there is a certain want of efficiency, some
from the want of a connecting or tongue piece to connect the ends where cut, others
from the imperfect fitting and form of the tongue pieces when employed. In the
more complicated forms and methods applied the large expense involved is a
considerable barrier to their adoption.
In carrying out my invention, according to one modification, I employ two
packing rings, one of square, rectangular or other similar form in section, resting
within the oth which is of au angular form in section, the periphery of each ring
making contact with the wall of the cylinder or casing, and so that when the.slots
or cuts in the respective rings are separated from each other, each ring will
perfectly cover the slot or cut of the other. I prefer making the angular ring or
both of such rings as self expansive spring rings, turning the same accurately to
fit the cylinder after being cut and after having the necessary amount of spring.
imparted to it or them, and I thereby obtain a most effective packing at a very
moderate cost.
When the rings are not rendered self-expansive, any suitable means may be.
employed to give the necessary expanding action thereto.
According to another modification, I employ_two_square- or -rectangular-rings,
and one of a form in section, the former rings resting on the flanges of the
latter ring.
Deted this 2nd down of Danambar 1800
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Packing Rings for Pistons and Circular Valves of
Steam and other Motive Power Engines, and for Pump Buckets
or Plungers and other similar purposes.
I, CEMER THOMAS COLEBROOK, of Union Square, Islington, in the County of
London, Engineer, do hereby declare the nature of the said invention and in what
nanner the same is to be performed to be particularly described and ascertained
in and by the following statement :—
This invention relates to improvements in packing rings for the pistons and
circular valves of steam and other motive power engines, also for pump buckets or
plungers and other similar purposes.
The invention has for its object the making of a more perfect elastic contact
between the inner wall of the cylinder or casing (hereinafter referred to as the
cylinder") and the piston, plunger, bucket or valve, as the case may be, (herein-
after referred to as the "piston") in which the packing rings are placed in order
to prevent any escape of the steam, air, gas, water or other fluid or liquid between
the adjacent surfaces of the cylinder and piston while at work.
Many forms of metallic packing rings and various other devices for giving
an outward pressure to the packing rings have been devised, from the plain
"Ramsbottom" rings to others of very complicated and costly character, all
striving to obtain the aforesaid object but with indifferent success.
In the simpler forms hitherto in use, there is a certain want of efficiency, some
from the want of a tongue-piece to connect the ends where cut, others from the
imperfect fitting and form of the tongue-pieces when employed. In the more
complicated forms and methods applied the large expense involved is a considerable
barrier to their adoption and use.
On the accompanying drawings,
Fig. 1, represents a perspective view partly in section of packing rings con-
structed according to my invention.
Fig. 2, represents in elevation partly in section an ordinary "Ramsbottom
piston adapted with the improved packing rings represented in Fig. 1, and
"
Fig. 3, represents a like view to Fig. 2, illustrating the application of another
modification of the improved packing rings.
In carrying out my invention, according to the modification represented in
Figs. 1, & 2, employ two packing rings 4, 5, one (4) of square, rectangular or
other similar form in section, resting within the other (5) which is of an angular
form in section, the outer periphery of each ring making contact with the wall of
the cylinder or casing, and so that when the slots or cuts 6, 7, in the respective
rings are separated from each other, eile Fig. 1, each ring will so cover the slot
or cut of the other as to avoid the necessity of any tongue or connecting piece.
According to another modification, vide Fig. 3, I employ two square or rectangular
rings 4, and one 5, of a 1-form in section, the rings 4, being adapted to rest on
the flanges of the ring 5.
The adjacent surfaces of the rings 4, 5, in each such modification, may be made
of a more or less curvilinear formation, but not so advantageously.
I prefer making the angular ring 5, or both or all of such rings 4, 5, as self-
expansive rings, turning the same accurately to fit the cylinder after being cut and
after having the necessary or most advisable amount of resiliency imparted to it or
them, and thereby obtain a most effective packing at a very moderate cost.
When the rings are not rendered self-expansive, any suitable means may be
employed to give the necessary expanding action thereto.

page_text: Having now particularly described and ascertained the nature of the said inveu-
tion and in what manner the same is to be performed, I declare that what I
claim is
In packing used for the purposes aforesaid, the use in combination, of an angular
expansible ring with one or more expansible rings adapted to rest within the angle
or angles thereof and to co-act therewith in manner aforesaid.
Dated this 23rd day of September 1891.
DAY, DAVIES & HUNT,
321, High Holborn, London, W.C., Agents for the Applicant.