Improvements in Packing for Stuffing-boxes.
Year: 1890

page_text: Date of Application, 30th Sept., 1890-Accepted, 8th Nov., 1890
COMPLETE SPECIFICATION.
Improvements in Packing for Stuffing-boxes.
We, ROBERT MARSHALL, of No. 121 Fenchurch Street, in the City of London,
Engineer, and EDWARD FITZGERALD, also of No. 121 Fenchurch Street, in the City of
London, 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 stuffing boxes, constructed and
applied as we shall describe referring to the accompanying drawings.
Fig. 1 is a plan, and Fig. 2 a side view of two layers of packing according to this
invention, each layer consisting of two segments one of which is shewn in perspective
by Figure 3. The segment A is made nearly semicircular at its outer circumference,
with sloped ends a, and it has at its middle a projecting wedge shaped part b with
sides of slope corresponding to the slope of the ends a.
The one pair of segments A is placed upon the other pair A¹, the projections b of
each of the segments A occupying the spaces between the ends of the segments A¹
and the projections 6' of the segments A' occupying the spaces between the
segments A.
The angles formed by the projections b are preferably right angles, as shewn in
Fig. 1, so that these projections form the corners of a square. The segments A A¹,
being pressed inwards by springs or otherwise, adapt themselves close to the piston
rod or plunger to which the packing is applied. Fig. 4 is a vertical section of a
stuffing box furnished with two layers A A¹ of segments such as are above described,
the segments A of the one layer being coned to fit the internally coned end of a
casing C which encloses the segments A A¹ but has certain freedom within the
stuffing box D, to allow for irregularities of the piston rod. The segments A¹ are
set up by a gland E and springs F. As shown in Fig. 5 there are two sets each of
two layers A A' of segments which are coned to fit internally coned linings G of the
stuffing box.
The pressure of the gland H is transmitted to the linings G through an elastic
packing K.
Instead of making the packing in several layers, the segments of each layer having
wedge shaped projections 6 as shewn in Fig. 3, corresponding wedge shaped pieces
may be made separate from the segments and arranged as shewn in the vertical
section Fig. 6 and sectional plan on X X Fig. 7. In this case there are three
segments with three interposed wedge pieces M, inclined to the axis.
Fig. 4, the packing segments are enclosed within a casing C and are set up by a
gland E and springs F.
As in
In the stuffing boxes shewn by Figs. 4 and 6, in which the casing C has certain
freedom, the springs F bear against the flat face of the bush P so as to allow for a
little transverse movement of the packing due to irregularities of the piston rod, the
casing C rocking a little on the coned bearings Q, which are approximately spherical,
or which may be made spherical surfaces.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. Metallic packing for stuffing boxes consisting of circular layers each of two
segments the segments of each layer being separated by wedge shaped projections
from the next layer, substantially as described with reference to Figs. 1, 2 and 3.
2. The modified packing consisting of one layer of three or more segments with
separate oblique wedge pieces interposed, substantially as described with reference to
Figs. 6 and 7.

page_text: 3. In combination with metallic packings of the kinds above referred to, the
casing C free in the stuffing box, the gland E and springs F bearing against the flat
face of the bush, P, and the conical or spherical bearings Q substantially as and for
the purpose set forth with reference to Figs. 4 and 6.
4. The combination of coned segment layers A A' and coned linings G with
gland H and elastic packing K, substantially as described with reference to Fig. 5..
Dated this 30th day of September 1890.
ABEL & IMRAY,
Agents for the Applicants.