IMPROVEMENTS IN VALUES
Year: 1881

page_text: LETTERS PATENT to John Smith, the younger, and Samuel Albert Johnson,
both of Millwall, in the County of Essex, for an Invention of "IMPROVEMENTS
IN VALUES"
PROVISIONAL SPECIFICATION left by the said John Smith & Samuel
Albert Johnson at the Office of the Commissioners of Patents on the
23rd August 1881.
JOHN SMITH, the younger, and SAMUEL ALBERT JOHNSON, both of Millwall, in
the County of Essex. "IMPROVEMENTS IN VALVES."
This Invention bas for its object improvements in valves applicable to air and
circulating pumps, and valves of all descriptions of marine and other engines, and
for other purposes. In carrying out the Invention we adopt mainly the following
arrangements:
We employ a metal valve packed on the face and on the back with canvas,
tucks, packing, or other substances. The said metal valve has recesses cut in the
face and back, said recesses being by preference of a dovetailed shape. The packing
is pressed into the recesses, and is held there by expanding in the dovetailed
recesses.
The packing projects outside the valve face, and when in action forms a tight
joint around the grating. On the back a recess is also cut in the boss of the valve,
and packed in a similar way to the face, and thus when the valve opens it is
checked by the packing in the boss coming in contact with a metal washer placed
on the stud in the grating.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Smith & Samuel Albert Johnson in the Great Seal Patent
Office on the 23rd February 1882.
JOHN SMITH, the younger, and SAMUEL ÅLBERT Johnson, both of Millwall, in
the County of Essex. "IMPROVEMENTS IN VALVES."
This Invention has for its object improvements in valves applicable to air and
circulating pumps, and valves of all descriptions of marine and other engines, and
for other purposes.
In carrying out our Invention we adopt the following
arrangements:—
We employ a metal valve packed on the face and on the back with canvas,
tucks, packing, or other substances. The said metal valve has recesses cut in the
face and back, said recesses being substantially of dovetailed shape. The packing
is pressed into the recesses, and is held there by expanding in the said recesses.
The packing projects outside the valve face, and when in action forms a tight
joint around the grating. On the back a recess is also cut in the boss of the valve
and packed in a similar way to the face, and thus when the valve opens it is
checked by the packing in the boss coming in contact with a metal washer placed
on the stud in the grating. The packing can be put into seats of valve instead of
in valve in cases where found suitable.
Having thus far described the nature of our Invention, and in what manner
same is to be performed, we will now proceed, by reference to the accompanying
Drawings, to further describe in what manner the same is to be performed or
carried out in practice.
Fig. 1 represents plan of valve and seat.
Fig. 2, vertical section.
A is valve with recesses or grooves formed therein substantially of dovetailed
shape, as shown, into which the packing B is pressed and held there by expanding
in the said recesses, which are cut on face and back of valve A, as shown.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed or carried out in
practice, we hereby declare that we claim the said Invention of "Improvements
in Valves," as hereinbefore set forth and described, in which the particular point or
feature is the adaptation and adoption of packing inserted in recesses substantially
similar in form and construction as hereinbefore set forth and described.
In witness whereof, I, the said John Smith, the younger, have hereunto
set my hand and seal, this Twenty second day of February, in the year of
our Lord One thousand eight hundred and eighty two.
Witness,
T. MORGAN,
21, Cockspur Street,
S.W.
JOHN SMITH, JUN³. (LS)