Improvements in Metallio Packing.
Year: 1892

page_text: Date of Application, 30th June, 1892
Complete Specification Left, 19th Oct., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Metallio Packing.
HAROLD BREWER "Ashbourne" Harrogate Yorkshire Marine Engineer, do
hereby declare the nature of this invention to be as follows:-
The nature of my invention consists of a metallic bush fitted round the working
rods, in segments, with the necessary tongue pieces & a recess cut on the inner side
of the said segments, to act as a vacuum chamber connected by a drain pipe to the
condenser.
Dated this 20th 1-1000
E. EATON,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Metallio Packing.
1, HAROLD BREWER Ashbourne Harrogate Yorkshire Marine 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:-
This invention relates to metallic packing for use in stuffing boxes, of piston
rods etc. and consists of a bush which may be made of any suitable metal such as
brass or white metal & constructed to fit round the working rods in segments. On
the inner surface of the said bush or segments, between the segments and the
piston rods, I provide a recess or recesses which I term vacuum chambers, or
cases of non-condensing engines, air chambers. These chambers in condensing
engines I connect with the condenser, by means of a pipe, so as to answer a double
purpose viz. by forming a vacuum between the packing & the rods which assists the
external pressure in the stuffing boxes, thus pressing the packing against the rods
& also for carrying away any leakage to the condenser. When a series of glands
are fitted in this manner, I prefer attaching the drain pipe to a gauge glass fitted
to the condenser, to ascertain if any leakage is taking place.
In non-condensing engines & where desired 1 allow the drain pipe to remain
open to the atmosphere the external pressure in the stuffing boxes, acting on the
reduced internal bearing surface against the rods, being sufficient to keep the
packing tight.
To prevent leakage through the divisions of the segments, I fit over capping
tongue pieces or rings cut in segments, top and bottom, & seal the vertical divisions
by a thin metallic sheathing (or in cases of low temperature I substitute tongue
pieces & canvas wrapping for the outer sheathing) the whole bush is then fitted
loosely into the stuffing box so as to allow the pressure of condensed steam from
the cylinders & valves, or water in cases of pumps to press against the outer side
of the packing.
I also fit recessed washers at the top and bottom of the bush to encircle the
segments extending the flange of the bottom washer beyond the outside diameter
of the stuffing box so as to form a steam tight joint against it. In existing engines
I find it convenient to reverse the gland for this purpose. In the top of the
stuffing box before entering the packing I introduce a circular spring or where
space permits a number of spiral springs in recesses cut in the top segment or
washer to secure them so as to allow the packing to adjust itself to the working
roda.

page_text: Referring to the annexed drawings,
Figure 1 is a sectional elevation of a gland fitted with my improved packing.
Figure 2, sectional plan through line, y.
Figure 3, sectional elevation of a modified arrangement.
Figure 4, plan of packing rings showing tongue pieces, similar letters of
reference denote similar parts.
Referring to Figures 1 and 2,
a is the gland cr stuffing box, the rings in sections surrounding the piston rod c.
d is a groove or recess formed in the rings 6 which communicates with the drain pipe e.
This drain pipe eis, in the case of a condensing engine in connection with the
condenser, and in non condensing engines open to the atmosphere. By this means
the rings are kept close to the piston rod c as a partial vacuum is formed in the
groove or recess d. Recessed flanges or tongue pieces are provided for retaining
the rings in position in the gland. If desired I may employ a spiral spring or a
number of small springs placed between the flanges & the neck bush in order to
allow the packing rings to adjust themselves to the movement of the piston rod.
In a modified arrangement I connect the drain pipe to the groove in the packing
through the side of the gland as shown in Figure 3, the tongues h are pinned or
otherwise conveniently secured at their ends to the segments as shown at i.
g, g, holes for the passage of bolts for bolting my arrangement in position.
Having now particularly described and ascertained the nature of my inven-
tion & in what manner the same is to be performed I declare that what I
claim is,
1. In a metallic packing recess or recesses provided in the metallic rings or
segments between the packing & the working rods with a drain pipe connected to
the condenser or open to the atmosphere as may be desired whereby the external
pressure admitted from the cylinders, valves, or pumps, to the outer side of the
said segments overcomes the pressure on the reduced internal bearing surface owing
to the recesses aforesaid either assisted by a vacnun or not.
2. In a metallic packing the recessed segments within the stuffing box or gland
arranged around the piston or pump rods with a drain pipe connecting the said
recesses with the condenser or atmosphere so as to form an air or vacuum chamber
between the packing & the working rods with means for sealing the vertical
divisions substantially as herein shown and described.
Dated this 19th day of October 1892.
E. EATON, C.E., M.S.A.,
Patent Agent.