IMPROVEMENTS IN STEAM ENGINES
Year: 1876

page_text: LETTERS PATENT to William Inglis, of Bolton, in the County of Lancaster,
Engineer, for the Invention of "IMPROVEMENTS IN STEAM ENGINES."
Canted the 21st November 1876 and dated the 30th May 1876.
PROVISIONAL SPECIFICATION left by the said William Inglis at the Office
of the Commissioners of Patents on the 30th May 1876.
WILLIAM INGLIS, of Bolton, in the County of Lancaster, Engineer.
MENTS IN STEAM ENGINES."
" IMPROVE-
This Invention relates to steam engines of the kind in which each cylinder has
four separate valves, and in carrying it out each cylinder is by preference con-
structed in the manner described in the Specification of Letters Patent granted
to the present applicant and dated 20 May, 1868 (No. 1659), excepting as
herein-after explained, the present improvements having principally for their object
to diminish the clearance or ineffective space in connection with the exhaust valves
by arrangements which admit of access being had to the interior of the cylinder or
other parts for examination or other purposes in the most convenient manner and
with the least disturbance of joints or connections or valve gear. In one modifi-
cation of the improved arrangements the exhaust valve box for each end of tho
cylinder is a casting separate from the external shell or jacket and from the internal
shell or lining, and also from the cover or end piece. The valve is of a segmental
cylindrical form, sliding with an angular movement about its axis on the internal
surface of a cylindrical cavity in the side of which is the exhaust port. The valvo
is placed athwart the cylinder, and when it is in its closed position there is at the
middle of its length little or no space between it and the interior of the cylinder.
In opening its port the valve moves partly into the cylinder space, but this is not
inconvenient as the piston is then not at that end of the cylinder. In another
modification the exhaust port face is formed on the box or separate casting con-
taining the exhaust passage so as to be a continuation of the internal surface
of the cylinder, and the valve is a segmental plate sliding on such internal cylindri-
cal port face in a longitudinal direction, being moved by one or more rods passing
out through stuffing boxes in the cylinder cover or end or in any other convenient
way. For opening its port the valve moves towards the middle of the cylinder,
the piston being then out of the way. The cylinder cover or end is formed with a
Price Gd.]

page_text: recess into which the valve moves when closing its port, and this recess as well
as the back of the valve are by preference bevilled so as to open a passage to the
exhaust port as soon and in proportion as the port becomes uncovered. The recess
for the valve might be formed in the piston instead of the cylinder end or cover, or
it might be partly in each.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Inglis in the Great Seal Patent Office on the 27th November
1876.
WILLIAM INGLIS, of Bolton, in the County of Lancaster, Engineer. "INPROVE-
MENTS IN STEAM ENGINES."
My said Invention relates to steam engines of the kind in which each cylinder
has four separate valves, and in carrying it out each cylinder is by preference
constructed in the manner described in the Specification of Letters Patent granted
to me and dated 20 May, 1868 (No. 1659), excepting in so far as herein-after
explained, my present improvements having principally for their object to diminish
the clearance or ineffective space in connection with the exhaust valves by arrange-
ments which admit of access being had to the interior of the cylinder or other
parts for examination or other purposes in the most convenient manner and with
the least disturbance of joints or connections or valve gear.
And in order that my said Invention and the manner of performing the saine
may be properly understood I hereunto append a Sheet of explanatory Drawings
to be herein-after referred to, and representing two modifications of my improved
arrangements. In these Drawings the same reference numerals are used to mark
the same or like parts wherever they are repeated.
Figure 1 on the Sheet of Drawings is a vertical section of part of a steam
cylinder showing one of the exhaust ports 4. The exhaust valve box 5 for each
end of the cylinder is a casting separate from the external shell or jacket 6, and
from the internal shell or lining 7, and also from the cover or end piece 8. The
exhaust valve 9 is of a segmental cylindrical form sliding with an angular move-
ment about its axis on the internal surface of a cylindrical cavity in the side of
which is the exhaust port 4. The valve 9 is placed athwart the cylinder, and
when it is placed in its closed position (in which it is shown in Figure 1) there is
at the middle of its length little or no space between it and the interior of the
cylinder. In opening its port 4 the valve 9 noves partly into the cylinder space,
but this is not inconvenient as the piston 10 is then not at that end of the cylinder.
Figures 2 and 3 are longitudinal and transverse vertical sections of the second
modification. In this case the face of the exhaust port 4 is formed partly on the
box or separate casting 5 containing the exhaust passage, and so as to be a con-
tinuation of the internal surface of the cylinder, and the valve is a segmental
plate 9 sliding on such internal cylindrical port face in a longitudinal direction,
being moved by one or more rods 11 passing out through stuffing boxes in the
cylinder cover or end 8, or in any other convenient way. For opening its port 4
cach valve 9 moves towards the middle of the cylinder, the piston 10 being then
out of the way. Each cylinder cover or end 8 is formed with a recess into which
the valve 9 moves when closing its port, and this recess and the back of the valve 9
are by preference bevilled so as to open a passage to the exhaust port 4 as soon
and in proportion as the port becomes uncovered. The piston 10 is shown partly
recessed to allow sufficient spaces for the exhaust valves 9, but the necessary
recesses might each be formed wholly in the covor or end 8, or in the piston 10.
My improvements are applicable to steam engine cylinders placed vertically
or in any other position.
Having thus particularly described my said Invention, and the manner of per-
forming the same. I have to state that I do not restrict myself to the precise

page_text: details herein described or delineated, but that what I believe to be novel and
original, and claim as the Invention secured to me by the herein-before in part
recited Letters Patent, is-
1. The formation of the port faces of the exhaust valves on castings separate
from the cylinder shell and lining and from the ends or covers, as hercin-before
described, combined with the positions and modes of action of the valves shown in
and herein-before described with reference to the accompanying Drawings.
2. The application of internal segmental longitudinally sliding exhaust valves
arranged and working as herein-before described.
In witness whereof, I, the said William Inglis, have hereunto set my hand
and seal, this Twenty-fifth day of November, in the year of our Lord One
thousand eight hundred and seventy-six.
WILLIAM INGLIS. (L.S.)