Year: 1896

page_text: I. NOEL CHANDLER, of Cannock Chase Engine Works, Hednesford, in the
County of Stafford, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to improvements in single acting engines such for
example as the kind described in the Specifications of former Letters Patent
granted to me, viz. No. 5792 of 1888 and No. 9600 of 1894, and it has for objects
to facilitate the packing and adjustment of the stuffing boxes of the piston and valve
rods of such engines, and also to isolate the air buffer or cushioning cylinder or
chamber from the low pressure cylinder.
For this purpose there is provided between the low pressure cylinder and the
crank chamber or casing on which such cylinder has heretofore been bolted, an
intermediate closed box or chamber that forms a distance piece between the parts
mentioned and is provided with suitably arranged openings that are normally
closed by easily removable doors or lids. The top of the box or chamber, which
also forms the bottom or cover of the low pressure cylinder, is provided with
stuffing boxes through which the piston rod and valve rod work and which are
designed to prevent leakage of steam or water from the bottom of the low pressure
cylinder and valve case into the box or chamber and thence to the crank case.
The bottom of the box or chamber is also provided with a stuffing box for the
piston rod, this stuffing box being designed to prevent oil and water from being
splashed or carried up from the crank chamber into the intermediate box or
chamber. The arrangement is such that all the stuffing boxes are accessible from
within the distance piece or box or chamber so that upon removing one or other
of the doors or lids thereof, any of the stuffing boxes can be easily and safely
repacked or adjusted even whilst the engine is at work.
The stuffing box at the bottom of the intermediate box or chamber also serves
to prevent leakage of air from the air buffer or cushioning chamber which I
sometimes provide between the engine crosshead and the top of the crosshead
guide cylinder. The arrangement described is specially suitable for single-acting
engines exhausting to a condenser as it prevents air being forced into the low
pressure cylinder on the compression of air in the cushioning chamber, and also
prevents air and oil being drawn into the said cylinder when a partial vacuum is
set up therein, points of considerable practical importance.
In one arrangement of my engine the bottom of the low pressure cvlinder and
the side wall of the intermediate box or chamber are formed in one piece of metal,
the bottom of such chamber being formed by a separate metal plate in one piece
with the cross head guide and air cushioning chamber, and the valve rod guide.
In another arrangement the distance piece and the cylinder are made in one

page_text: piece or casting, and the cross head guide cylinder or air cushion cylinder is
secured to it by a flange and bolts.
Dated this 12th day of October 1896.
I, NOEL CHANDLER, of Cannock Chase Engine Works, Hednesford, in the
County of Stafford, 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 has reference to improvements in single acting engines, such for
example as the kind described in the Specifications of former Letters Patent
granted to me, viz. No. 5792 of 1SSS and No. 9606 of 1894, and it has for objects
to facilitate the packing and adjustment of the stuffing boxes of the piston and valve
rods of such engines, and also to isolate the air buffer or cushioning cvlinder or
chamber, from the low pressure cylinder, as I shall now proceed to describe with
the aid of the annexed drawing, which represents in vertical section, so much
of a single acting engine of the kind referred to as is necessary to enable the present
invention to be clearly understood.
For the purpose referred to, there is provided according to my invention, be-
tween the low pressure cylinder 1, and the crank chamber or casing 2, on which
such cylinder has heretofore been bolted, an intermediate case, box, or chamber 3
that forms a distance piece between the parts mentioned and is provided with
suitably arranged openings such as those marked 4, and 5 that are preferably
closed by easily removable doors or lids 6. The top of the box or chamber 3,
which also forms the bottom or cover of the low pressure cylinder 1, is provided
with stuffing boxes 7 and 8, through which the piston rod 9, and the valve rod 10,
respectively work, and which are designed to prevent leakage of steam or water
from the bottom of the low pressure cylinder 1, and valve case 1, into the box or
chamber 3, and thence to the crank chamber 2. The bottom of the box or
chamber 3 is also provided with a stuffing box 12 for the piston rod 9, this stuffing
box being designed to prevent oil and water from being splashed or carried up
from the crank chamber 2, into the intermediate box or chamber 3. The doors
lids Gare held in place by any suitable means as will be well understood. The
arrangement is such that all the stuffing boxes 7, 8, and 12, are accessible from
within the distance piece box or chamber 3, so that upon removing one or other
of the doors or lids thereof, any of the stuffing boxes can be easily, and safely re-
packed or adjusted even whilst the engine is at work. The stuffing box 12 also
serves to prevent leakage of air from the top of the air buffer or cushioning
chamber 13 which I sometimes provide (as in the example illustrated) between
the engine cross head 14, and the top of the cross head guide cylinder 15. The
arrangement described is specially suitable for single acting engines exhausting to
a condenser; as it prevents air being forced into the low pressure cylinder 1 on
the compression of air in the cushioning chamber, and also prevents air and oil
being drawn into the said cylinder when a partial vacuum is set up therein; points
of considerable practical importance.

page_text: To make good any loss of air that may take place from the cushioning cylinder 13
the upper end of the cross head 14 is formed with a hole 14, which, when the
cross head arrives at the bottom of its stroke, comes opposite a hole 15" in the
guide cylinder 15 and so places the interior of the cushioning cylinder in com-
munication for a short time with the interior of the crank chamber, as in known
constructions of engines.
In the arrangement illustrated, the bottom of the low pressure cylinder 1, and
the side wall of the intermediate box or chamber 3, are formed of one piece of
metal, the bottom of the said chamber being formed by a separate metal plate 16,
in one piece with the cross head guide and air cushioning cylinder 15. The valve
rod guide 17 might be in one piece with the metal plate 16. Usually however
it will be more convenient to make it separate from the said plate, as in the
example shown, and to connect it to the said plate and the cross head cylinder or
guide 15 by flanges as indicated at 18 and bolts. The distance piece or chamber 3
and the cylinder 1 may be made in one piece or casting, and the cross head guide
cylinder or air cushioning cylinder 15 be secured thereto by a flange and bolts.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. Providing between the low pressure cylinder of a single acting engine and
the crank chamber or casing below such cylinder, an intermediate box or chamber
that forms a distance piece between these parts and is provided at the top with
stuffing boxes for the piston and valve rods and at the bottom with a stuffing
for the piston rod and has suitably arranged openings through which ready access
can be obtained to the said stuffing boxes, substantially as herein described.
2. In an engine of the kind referred to, the improved means described and shown
for enabling ready access to be gained to the stuffing boxes of the piston and valve
rods, for preventing leakage of air from the air buffer or cushioning chamber into
the low pressure cylinder, and for preventing air and oil being drawn into the said
cvlinder from the crank chamber.
Dated this 7th day of Tule 1007
T..1.. 100%
Dated this 7th day of July
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.