IMPROVEMENTS IN OR RELATING TO THE VALVE MOTIONS OF ENGINES WORKED BY STEAM OR OTHER ELASTIC FLUIDS
Year: 1884

page_text: дашяпы то
Worked by Steam or other Elastic Fluids.
I WILLIAM NATHAN DACK, of 10 Byron Street, Patricroft, in the County of
Lancaster, Consulting Engineer do hereby declare the nature of said Invention
for IMPROVEMENTS IN OR RELATING TO THE VALVE MOTIONS OF ENGINES WORKED
BY STEAM OR OTHER ELASTIC FLUIDS to be as follows:-
My invention relates to improvements in steam or other motive power engines
and is particularly applicable to the Invention for which Letters Patent N° 3176
A.D. 1870 were granted to George Holcroft and to me the said William Nathan
Dack; the object of my Invention being to dispense with stuffing boxes for
reciprocating valve rods, thereby reducing the number of steam joints and
economising steam.
In applying my Invention to the valve motion shown in Fig. 4 of the above
named Letters Patent N° 3176 A.D. 1870 I enlarge the valve chest so that it
encloses the movable slide and the double lever which is hinged to it and so that
it also encloses the greater or any portion of the rod which connects the said
double lever or levers to the governor.
By enclosing the valve motion in the steam chest in the manner described I am
enabled to reduce the number of steam joints, to avoid friction on the valve rods,
to reduce the work of the governor and to simplify the construction of the engine.
It is obvious that the governor might be connected to the stud or shaft of the
said double lever or wrist pin outside the enlarged steam chest but in this case a
stuffing box would be required. I employ, by. preference, a circular stuffing box in
order to avoid unnecessary friction on the governor.
H. B. BARLOW,
Agent for Applicant,
4, Mansfield Chambers,
17, St. Ann's Square, Manchester.

page_text: Improvements in or relating to the Valve Motions of Engines
Worked by Steam or other Elastic Fluids.
I WILLIAM NATHAN DACK, of 10 Byron Street, Patricroft, in the County of
Lancaster, Consulting Engineer do hereby declare the nature of said invention for
"IMPROVEMENTS IN OR RELATING TO THE VALVE MOTIONS OF ENGINES WORKED
BY STEAM, OR OTHER ELASTIC FLUIDS," and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
My invention relates to improvements in steam or other motive power engines
and is particularly applicable to the Invention for which Letters Patent N° 3176
A.D. 1870 were granted to George Holcroft and to me the said William Nathan
Dack, the object of my Invention being to dispense with stuffing boxes for 1
reciprocating valve rods, thereby reducing the number of steam joints and
economising steam.
In applying my Invention to the valve motion shown in Fig. 4 of the above
named Letters Patent N° 3176 A.D. 1870 I enlarge the valve chest so that it
encloses the movable slide and the double lever which is hinged to it and so that
it also encloses the greater or any portion of the rod which connects the said double
lever or levers to the governor.
By enclosing the valve motion in the steam chest in the manner described I am
enabled to reduce the number of steam joints, to avoid friction on the valve rods,
to reduce the work of the governor and to simplify the construction of the engine.
It is obvious that the governor might be connected to the stud or shaft of the
said double lever or wrist pin outside the enlarged steam chest, but in this case a
stuffing box would be required. I employ by preference a circular stuffing box in
order to avoid unnecessary friction on the governor.
And in order that my Invention may be more fully understood and readily
carried into effect I have annexed hereto a Sheet of Drawings in which
Figure 1 is an elevation and Fig. 2 a plan partly in section of so much of an
engine as is necessary to illustrate my Invention and Fig. 3 is a transverse section
of the valve chest and cylinder.
a is the cylinder; b b the slide valves connected by the rod c to the slide d
which is connected by the rod d¹ to the main eccentric, (not shown); ee are the
expansion valves fitted in a frame f connected by a rod f¹ to a slide f' working on
the slide d and actuated from the crank shaft by a rod f³; g is a stud on which
the double lever h is mounted and free to turn in the frame f; the double lever
is connected to the expansion valves ee by rods h³, and by a rod h³ to a short lever i,
connected to the shaft which passes through circular stuffing boxes j, and is
connected by levers k to the governor 1; m is the enlarged valve chest; m² the
extension of the same which encloses part of the connections to the governor,

page_text: 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
In valve motions of the type described and illustrated by Fig. 4 of the said
Patent Nº 3176 A.D. 1870, enclosing the valve motion and part of the governor
connections within the valve chest and the arrangements for effecting the same,
substantially in the manner and for the purposes herein described and as illustrated
by the Drawings annexed,
.