Year: 1895

page_text: Date of Application, 19th Feb., 1895
Complete Specification Left, 30th Oct., 1895-Accepted, 7th Dec., 1895
1, JEREMIAH EUGENE MATHEWSON of 21 Northumberland Road, Sheffield, in
the County of York, Engineer do hereby declare the nature of this invention to be
as follows:-
The importance of lightness and compactness combined with that of closing
quickly and opening easily in the valves of high speed air and other pumps are
well known.
Coiled springs are generally used to force the valves against their seats, and in
consequence of the unequal bearing upon the valves they are usually provided with
guide spindles so as to cause them to seat squarely. The hammering of these
valves often cause the spindles to break off and damage the machine.
My invention consists of a new form of spring which is light, inexpensive to
make, occupies little space and gives an equal bearing on the valve, which therefore
requires no guide spindle. It consists of three or more arms, made of a springy
material, starting from a central disc and curving round to the right or left to any
suitable distance.
In carrying out my invention I prefer to make the springs of circular pieces of
thin hard sheet brass or steel, of the same, or less than the diameter of the valve
upon which it is to be used, having holes in the centres for the studs or bolts.
Commencing about a quarter of an inch from the hole in the centre, I cut away or
separate the metal by sawing or punching or otherwise in such a manner as to form
three or more spirally shaped and gradually tapering flat arms. 1 then bend the
arms so that when the spring is placed upon a flat surface, the ends ouly of the
arms will touch, while the central portion will be three eights of an inch or there-
abouts above the said surface. The valve consists of a Hat circular disc of any
suitable material such as sheet brass, iron or steel, leather, &c., with a round hole
through the centre for the stud or bolt. The valve is then placed upon its seat,
with the spring bearing against the opposite side, and a stud or bolt having a thin
brond head passed through to keep them in place, one eighth of an inch or
thereabouts being allowed for the valve to lift.
D: 10th
100-
J. E. MATHEWSON.
I JEREMIAH EUGENE MATHEWSON of Bellefield Works, Sheffield, 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 :-
The object of this invention is to provide a simple, compact, and efficacious
pressure spring for disc valves of air and other pumps, the pressure of which spring
will be so distributed as to preserve the horizontality or verticality (as the case
nay be) of the valve to which it is applied, when the valve is forced from its seat.

page_text: The common practice has heretofore been to use coiled springs to hold the
valves against their seats, but in consequence of their unequal bearing upon the
valves, they are usually provided with guide spindles, so as to cause them to seat
squarely, the advantage of compactness of arrangement being disregarded. More-
over, the hammering of valves fitted with coiled springs often causes the spindles
to break off, and damage the machine. But, by my invention, these disadvantages
are avoided, while at the same time the rapid action of the valves is secured.
In the accompanying drawing,
Fig. 1 shows in plan view, and in full size, a spring constructed according to my
invention, and bearing on a seated disc valve; and
Fig. 2 is an edge view of the same.
In these figures, A is the seat with its openings a for the passage of the fluid
impelled by the force pump. These openings are covered by the thin dise valve B,
which is held to its seat by the overlying spring C. This spring is made from a disc
of rolled brass or steel slightly less in diameter than the valve itself, and punched
with a central hole, to allow of the passage through it of a central bolt D, which
is fixed to the valve seat A, and properly a ljusted thereto by nuts d. This central
bolt forms the guide stem on which the valve B works, and it serves also to retain
the spring C in place. The spring is formed by punching out, from the rolled
metal, curved arms, which taper from their ruot towards their extremities, which
extremities are bent down to press upon the back of the underlying valve.
In the drawing, three curved arins only are shown, and this number will in
general suffice, but four or more may be used, as the diameter of the disc valve to
which the spring is to be applied increases, and for smaller valves, two bearing
points to the spring may suffice.
It will be understood that the elasticity of the spring will depend upon the
thickness and length of the arms. The strength of the spring should be so
adjusted as to allow of its valve rising (under pressure) some eighth of an inch or
more from its seat, and, by the set of the arms, their resistance to the rise of the
valve may be readily determined.
By distributing the pressure of the spring through its arms upon the back of the
valve, all tendency of the valve to tip will be avoided, and thus the necessity for
using guiding spindles will be removed.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The construction of pressure spring for valves as above described, whereby an
even elastic pressure may be distributed over the back of the valve, as and for the
purpose above set forth."
Doted this 24th 2on of Docation 100
NEWTON & SON,
Agents for the Applicant.