IMPROVEMENTS IN THE CONSTRUCTION OF ASBESTOS PACKED Cocks
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We JOHN DEWRANCE and GEORGE HENRY WALL both. of 158 Great Dover St.
Lambeth in the county of Surrey Engineers.do hereby declare the nature of their
said invention for IMPROVEMENTS IN THE CONSTRUCTION OF ASBESTOS PACKED
Cocks to be as follows:-
We make the plug of the Cock parallel, with a gland at each end. which
compresses a ring of packing placed around the plug; these two rings of packing
are joined by strips of packing in grooves in the shell which makes the cock tight
through. The glands are provided with stops to prevent the plug being forced out
when the glands are in position; but when the glands are removed the plug can
be taken out from either end without disturbing the packing and by, reversing or
changing the glands the handle of the plug can be made to project from either end
of the shell as may be convenient; or, one end of the shell may be closed and the
packing between the bottom and the underside of the water way may be
compressed by. frames which when in position surround the water way; these
frame pieces are guided laterally by ribs which also form the sides of the packing
grooves; on the top of these frames the upper ring of packing rests, and the
pressure of the gland is communicated through the upper ring of packing and the
frames to the packing under the water way, a projection of the gland prevents
the plug being forced out but when the gland is removed the plug can be taken
out without disturbing the packing.
11
The packing below the water way which only requires to be a section of a ring
may be compressed from the outside and retained in position by a gland held by a
central screw screwed into the bottom of the shell or by bolts and nuts in the
usual way.
CLIC
The internal part of the cock may be formed as a kind of bush independent of
the shell or body, having across the bottom a bar which fits into a corresponding
groove or recess in the bottom of the shell, in this groove or recess and in two
grooves in the outside of the bush running parallel with the axis of the plug
packing is compressed and the bush is held down in position by the upper ring of
BK LP
'
Dated this 22nd day of February 1884.
5.
1
3
GEORGE HENRY WALL: [

page_text: We JOHN DEWRANCE and GEORGE HENRY WALL both of 158 Great Dover Street,
Lambeth in the county of Surrey, Engineers, do hereby declare the nature of our
invention for IMPROVEMENTS IN THE CONSTRUCTION OF ASBESTOS PACKED COCKS,
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
We make the plug of the cock parallel, with a gland at each end. These glands
compress rings of packing placed around each end of the plug; the rings of
packing are joined by longitudinal strips of packing in grooves in the shell. The
glands are made with stops to prevent the plug being forced out while they are
in position; when the glands are removed the plug can be taken out from either
end without disturbing the packing and by reversing the glands the handle of the
plug can be made to project from either end of the shell as may be convenient.
Sometimes it is more convenient to have one end of the shell closed in this case in
place of a second ring of packing we employ segments of a ring of packing to
connect the longitudinal strips, these segments are compressed by frame pieces
which answer the same purpose as the second gland; these frame pieces when in
position surround the water way and are guided laterally by ribs, which also form
the sides of the packing grooves; on the top of these frame pieces a ring of packing
rests and the pressure of the gland is communicated through this ring of packing
and the frame pieces to the segments of packing on the other side of the water
way; a projection of the gland prevents the plug being forced out, when the gland
is removed the plug can be taken out without disturbing the packing. On the
accompanying sheet of drawings Fig. 1. is a sectional elevation, and Fig. 2. is a
sectional plan of a cock illustrating the application of our invention to a double
gland cock. a is the body and b the plug which is made parallel c and d are
glands which compress the rings of packing e, e, strips of packing e¹, e¹, join these
rings. The glands c and d have a shoulder or some suitable form of stop to prevent
the plug being blown out.
The gland c can be put in the end now occupied by the gland d so that the
handle of the plug may project the opposite way when required.
As the plug b is parallel the glands are both free to further compress their
respective rings of packing without altering the .fit of the plug in the shell; the
plug is for this reason allowed a little movement endwise.
Fig. 3. is a sectional elevation of a cock shewing the application of our invention
to a Single Gland cock. Fig 4 is a sectional plan and Fig. 5. a cross section with
the plug removed.
In this case also a is the shell b the plug and c the gland. The strips of packing
marked e¹, el on Fig's. 4 and 5 are connected by segments of a ring of packing g, in
Fig. 5. represents one of these segments each of which is compressed by a frame
piece, such as is shewn in elevation by Fig. 6; these frame pieces are guided
laterally by ribs; h, h, and are forced down on the segments of packing by the
pressure of the ring of packing upon their upper surfaces; the top ring of packing
is in turn compressed by the gland c.
Having now particularly described and ascertained the nature of our said
Invention, and in what manner the same is to be performed, we declare that what
we claim is -
Firstly-The construction of a double gland asbestos packed cock in which both
glands are free to further compress their respective rings of packing without
altering the fit of the pluơ in the shell substantially no decoribed

page_text: Secondly-The construction of a parallel asbestos packed cock having two
interchangeable glands so arranged that the plug can be placed in the shell either
way substantially as described.
Thirdly-The construction of an asbestos packed cock so arranged that the
plug can be taken out from whichever end of the shell is convenient and without
disturbing the packing.
Fourthly The construction of an asbestos packed cock in which frame pieces
are employed in place of a second gland to compress and confine segments of
packing which connect the packing in the grooves.
-
Fifthly The construction of a single gland, asbestos packed cock from which
the plug can be removed without disturbing the packing substantially as described.
Sixthly The construction of asbestos packed cocks substantially as described
and represented in the drawings annexed.
Dthis o
Kirarah: 1001.