IMPROVE- MENAS TE THE CONSTRUCTION OF SLIDE VALVES FOR STEAM ENGINES
Year: 1872

page_text: LETTERS PATENT to George Ambrose Haworth, of Silkstone Main
Colliery, in the Parish of Cawthorne, in the West Riding of the
County of York, Mining Engineer, for the Invention of "IMPROVE-
MENAS TE THE CONSTRUCTION OF SLIDE VALVES FOR STEAM ENGINES."
Sealed the 30th May 1873, and dated the 4th December 1872.
5
PROVISIONAL SPECIFICATION left by the said George Ambrose
Haworth at the Office of the Commissioners of Patents, with his
Petition, on the 4th December 1872.
I, GEORGE AMBROSE HAWORTH, of Silkstone Main Colliery, in the
Parish of Cawthorne, in the West Riding of the County of York,
Mining Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF SLIDE VALVES FOR STEAM ENGINES,"
to be as follows:-
This Invention relates to improvements in the construction of slide
valves for steam or other motive power engines, with the object of
reducing the amount of friction between the valve face on the cylinder
of such engine and the slide valve face, which is caused to travel over
the said valve face by means of the eccentric rod or other method of
moving such slide valve.
For the purpose of carrying out my improvements I take the steam
2
1
In the area A

page_text: top of the same opposite to the valve face to be planed and faced so as
to be exactly parallel to the said valve face, as is well understood. I
take a slide, valve planed and faced as to the under or valve side in the
usual manner, and arranged as desired as regards size of exhaust lap and
other particulars, and it may be connected with the "valve spindle" by :
any well-known means. The upper part, or that above or opposite to
the face, is carried up square, or nearly so, with the valve, and forms a
sort of box. This is planed inside so. as to receive the cover or equi-
librium valve, into which it is accurately fitted, or the box portion of the
valve may be round and bored or turned inside, so that the upper part
of the valve being turned to fit it may be steam-tight at the joint, and
made so by means of springs or other mechanical contrivances.
The upper portion of the valve above described has a planed and faced
surface to work against the planed and faced surface of the steam chest
cover, and may be of any desired size, but I prefer to make it of about 1
the size of the outside of the slide valve face, and it is connected with
the bottom or slide valve portion of the valve by means of two or more
adjusting screws (which may have springs under them if desired) for the
purpose of keeping the upper surface of the valve against the steam
chest cover.
The upper part of the valve may be kept steam-tight as regards the
adjustable portion between it and the lower part by recesses prepared in
such lower part and filled or partly filled with india-rubber, which is
pressed down by the adjusting screws before mentioned, or by the con-
struction of the valve taking advantage of the motive power used. These s
adjusting screws may be set by proper spanners, which may be inserted
through plug holes left for the purpose in the steam chest cover or in
any other convenient manner, as is well understood.
The upper part of the valve I make with an opening, which connects
it internally with the exhaust port on the under side, while the rubbing a
or valve surface of the upper or steam chest cover side consists merely
of a sufficient width of metal round the edge of the valve to ensure its
being kept steam tight.
The exhaust steam may if desired be taken away through the steam
chest cover instead of through a port or opening on the cylinder valve
face as is usual, the steam being admitted at any convenient part of the
side or end of the steam chest.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Ambrose Haworth in the Great Seal
Patent Office on the 4th June 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
AMBROSE HAWORTH, of Silkstone Main Collieries, in the Parish of
Cawthorne, in the West Riding of the County of York, Mining
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of December, in the year
of our Lord One thousand eight hundred and seventy-two, in the thirty-
sixth year of Her reign, did, for Herself, Her bheirs and successors, give
and grant unto me, the said George Ambrose Haworth, Her special
license that I, the said George Ambrose Haworth, my executors, adminis-
trators, and assigns, or such others as I, the said George Ambrose
Haworth, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term thercin expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN THE CONSTRUCTION OF SLIDE VALVES FOR STEAM ENGINES,”
upon the condition (amongst others) that I, the said George Ambrose
Haworth, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same
to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said George Ambrose Haworth, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say :—
This Invention relates to improvements in the construction of slide
valves for steam or other motive power engines, with the object of
reducing the amount of friction between the valve face in the cylinder
of such engine and the slide valve face, which is caused to travel over
the said valve face by means of the eccentric rod or other method of
moving such slide valve.

page_text: And in order that my Invention may be clearly understood and
readily carried into practice I will proceed to describe the Drawing
hereunto annexed, which shows several views of slide valves arranged
and constructed in accordance with my improvements, similar letters of
11
T
And in order that my invention may be clearly
CALACA
readily carried into practice I will proceed to describe the Drawing
hereunto annexed, which shows several views of slide valves arranged
and constructed in accordance with my improvements, similar letters of
reference indicating corresponding parts in all the Figures.
a is the steam chest of steam or other motive power engine, the
cover or top a¹ of the same opposite to the slide valve face a³ being
planed and faced so as to exactly parallel to the said valve face a², as is
well understood.
The slide valve b is planed and faced as to the under or valve side in
the usual manner, and may be arranged as desired as regards size of
exhaust lap and other particulars, and it may be connected with the
The upper
valve spindle 6' as shown or by any well-known means.
part 6, or that above or opposite to the face of the valve, is carried up
square, or nearly so, with the valve, and forms a sort of box. This box:
or case 6º is planed on its inside surface so as to receive the cover or
equilibrium valve c, which fits accurately into the box or case 6³ as shown;
or the box portion 62 of the valve 6 may be round and bored or turned
inside (as shown in Figures 1, 2, and 3 of the Drawings), so that the
upper part c¹ of the valve being turned to fit it is steam-tight at the
joint, being made so by means of a spring or springs c², packing, or by
other mechanical contrivance.
The upper portion c¹ of the slide valve above described has a planed
and faced surface to work against the planed and faced surface of the
steam chest cover a¹, and may be of any desired size, but I prefer to
make it of about the size of the outside of the slide valve face, and it is
connected with the bottom or slide valve portion of the valve by means
of two or more adjusting screws c³ (which are arranged with springs c²
under them or otherwise if desired) for the purpose of pressing the upper
surface of the valve against the steam chest cover a².
The upper part of the slide valve may be kept steam-tight as regards
the adjustable portion between it and the lower part by recesses o*
(Figure 4) prepared in such lower part and filled or partly filled with
india-rubber, which is pressed down by the adjusting crews c³ before
mentioned, or by the construction of the valve taking advantage of the
motive power used. The adjusting screws o³ may be set by proper

page_text: spanners, which may be inserted through screw plug holes a left for
the purpose in the steam chest cover a¹, or in any other convenient
manner, as is well understood.
The upper part of the slide valve 6 is formed with an opening which
connects it internally with the exhaust port in the under side, while the
rubbing or valve surface of the upper or steam chest cover side consists
merely of a sufficient width of metal round the edge of the valve to.
ensure its being kept steam-tight.
The exhaust steam may if desired be taken away through the steam
chest cover a¹ instead of through a port or opening in the cylinder valve
face as is usual, the steam being admitted at any convenient part of the
side or end of the steam chest.
Having thus described the nature of my Invention, and the manner of
carrying the same into practice, I would remark that I do not intend to
limit myself to the exact details previously described, but what I claim
is, the improved arrangement and construction of the slide valves of steam
and other motive power engines, substantially in the manner herein-
before described and shown in the Drawings hereunto annexed.
In witness whereof, I, the said George Ambrose Haworth, have
hereunto set my hand and seal, this Third day of May, in the
year of our Lord One thousand eight hundred and seventy-
three.
AHANAT
GEORGE AMBROSE HAWORTH.
(L.S.)