Year: 1897

page_text: I, RICHARD ROBINSON LAWSON, of Belle Isle Street, Workington, in the County of
Cumberland, Brass Founder, do hereby declare the nature of this invention to be
as follows:
This invention relates to such cocks as are provided with asbestos or
other suitable packing in grooves running lengthwise along the inner side of the
barrel shell or casting in which the plug of the cock is fitted.
Hitherto it has been usual to cast dovetailed or undercut grooves or other similar
recesses in which to force the packing around the plug and it is found difficult to
compress the packing evenly in the several grooves or recesses.
In order to obviate this defect I form cylindrical recesses in the aforesaid barrel
shell or casting in such a manner as to be connected by an open slot or by port
holes with the plug of the cock or gauge.
The packing will flow much more easily in these cylindrical recesses than in the
ordinary angular grooves above described as the cylindrical recesses can be finished
quite smooth inside. These cylindrical recesses can therefore be much more easily
and evenly packed than straight or tapered angular recesses.
As a
The ordinary method of holding and tightening these packings in their recesses
is by means of a ring or gland screwed or otherwise tightened down thereon, the
same ring or gland therefore serves for all the packings and necessitates most
careful regular and perfectly uniform packing in all the grooves or recesses.
further improvement I propose to provide a separate screwed plunger or ram or
equivalent adjustable device pressing down or inwards upon the packing in each of
the cylindrical recesses above described.
By this means the packing in each recess can be compressed separately, and in
cases where the plungers or rams work through the gland they will take some of
the strain off the plug which will evidently work more easily.
By removing any one of these plungers or rams the corresponding recess can be
repacked without interfering with the gland.
I sometimes form a groove in the shell or casing around the end of the plug
under the port and I connect this groove with the recesses aforesaid and thus the
end or bottom of the plug can be repacked also without removing the gland or
plug.
By my improvements I can repack a cock under pressure.
In some cases I may bore or form the cylindrical recesses open at both ends
right through the casing or shell and provide screwed plungers or rams or the like
at each end, and by taking out both plungers or rams from any recess the old
packing can be driven out entirely and fresh packing substituted without uncoupling
the cock or gauge or taking off the gland thereof.
When the recesses are connected by ports with the plug, cocks with taper or
parallel plugs can be packed as above described.

page_text: The plunger or ram can be screwed in the gland or in the recess through a false
bush, if more room is required to get at the packing.
The plungers or rams could if necessary be provided with lock covers to prevent
unauthorized persons from tampering with them.
A further great advantage in a cock made according to this invention is that
although so perfectly packed it can have a full area of opening through the
plug.
Dated this 20th
רד. -.נ
1
1000
Improvements in Cocks.
I, RICHARD ROBINSON LAWSON, of Belle Isle Street, Workington, in the County of
Cumberland, Brass Founder, 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 :—
or
This invention relates to such cocks ag are provided with asbestos
other suitable packing in grooves running lengthwise along the inner side of the
barrel shell or casting in which the plug of the cock is fitted, and the same will be
readily understood on reference to the accompanying drawings.
'
Fig. 1 is half a plan view and half a horizontal section through a cock made
according to my invention.
Fig. 2 is a longitudinal section thereof.
Figs. 2, 3 and 4 illustrate in longitudinal section and Fig. 5 in plan modifications
hereafter more particularly referred to.
a is the barrel or shell of the cock, and 6 is the plug. c is the gland.
Hitherto it has been usual to cast dovetailed or undercut grooves or other
similar recesses in which to force the packing around the plug and it is found
difficult to compress the packing evenly in the several grooves or recesses.
In order to obviate this defect I form cylindrical recesses a¹ (see section Fig. 1)
in the aforesaid barrel shell or casting a in such a manner as to be connected by
an open slot as shewn, or by port holes, with the plug 6 of the cock or gauge.
The packing will flow much more easily in these cylindrical recesses a¹ than in
the ordinary angular grooves above described, as the cylindrical recesses can be
finished quite smooth inside. These cylindrical recesses can therefore be much
more easily and evenly packed than straight or tapered angular recesses.
The ordinary method of holding and tightening these packings in their recesses
is by means of a ring or gland screwed or otherwise tightened down thereon, the
same ring or gland therefore serves for all the packings and necessitates most
careful regular and perfectly uniform packing in all the grooves or recesses.
further improvement I propose to provide a separate screwed plunger or ram c¹ or
equivalent adjustable device pressing down or inwards upon the packing in each of
the cylindrical recesses a¹ above described.
As a
By this means the packing in each recess can be compressed separately, and in
cases where the plungers or rams c² work through the gland c as shewn, they will
take some of the strain off the plug b which will evidently work more easily. The
rams c¹ may however pass through the bottom of the shell or casting a as seen at
Fig. 2.

page_text: In any case by removing any one of these plungers or rams c¹ the corresponding
recess a¹ can be repacked without interfering with the gland c.
I sometimes form a groove a² (see Fig. 4) in the shell or casing a around the
end of the plug under the port and I connect this groove a² with the recesses a¹
aforesaid, and thus the end or bottom of the plug can be repacked also without
removing the gland or plug.
By my improvements I can repack a cock under pressure.
In some cases I may bore or form the cylindrical recesses a' open at both ends
right through the casing or shell a as shewn at Fig. 3, and I provide screwed
plungers or rams c¹ or the like at each end, and by taking out both of the plungers
or rams from any recess the old packing can be driven out entirely and fresh
packing substituted without uncoupling the cock or taking off the gland thereof.
When the recesses are connected by ports with the plug, cocks with taper or
parallel plugs can be packed as above described.
Each plunger or ram c¹ can be screwed in the gland c or through a false or
removable bush c* (see Fig. 5) fitted in the gland c, if more room is required to
get at the packing.
The plungers or rams could if necessary be provided with lock covers to prevent
unauthorized persons from tampering with them..
•
A further great advantage in a cock made according to this invention is that
although so perfectly packed it can have a full area of opening through the plug.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. An improved asbestos packed or similar cock having longitudinal cylindrical
recesses for packing communicating by slots or ports with the plug substantially
as herein before described.
2. The combination with the cylindrical packing recesses of a cock, of adjustable
plungers rams or the like for pressing down or tightening the packing of each
recess separately substantially as herein before described.
3. The combination with the plug of a cock, of cylindrical or similar recesses
for the packing thereof, such recesses being open at both ends and provided with
removable and adjustable plungers rams or screws so that the old packing can be
entirely removed from any recess if desired and fresh packing substituted sub-
stantially as hereinbefore described.
4. The casting or shell of a cock formed substantially as described with reference
to Fig. 4 of the annexed drawings.