Year: 1886

page_text: Date of Application, 26th Mar., 1886.
Complete Left, 28th Dec., 1886.
Complete Accepted, 26th Mar., 1887.
I WILLIAM BRAGG of Guildford Street, York Road Lambeth in the county of
Surrey Engineer, do hereby declare the nature of this invention to be as follows:-
--
This invention relates to certain improvements in safety valves and has for object to
alter the pressure on the valve and this is offected by a system of varying fulcrumns
for the pressing or weight lever so as that the valve shall not be liable to be over
prossed.
The body of the valve is made in a casting in convenient manner and with lugs or
bearings to receive the joints or fulcrums of the pressing lever and of the link or links
in connection with such lever.
The pressing lever is jointed at proper distance from the head of the valve said
jointing being made in such manner, by slotting the hole or holes thereof, as to allow
of the fulcrum being varied.
At the rear of this jointing of the pressing lever the said lever has an arm or
extension-piece which extension piece is jointed at its end by a link or links to a fixed
bearing or part and the jointing of this tail end of the lever and its link may be
slotted to correspond to the slotting before described for the first fulcrum of the lever.
In working The valve is actuated by the steam, lever, and fulcrum, and its spring
or weight in the following manner :-
-
The pressure of steam raises the valve and lever, depresses the tail of the lever by
means of the radial action of the link or links, and by that action alters the weight on
the valve in exact proportion to the variations of the fulcrums and as the steam is
released in greater proportion so the valve will return to its seating with the original
pressure in such manner as not to render the boiler or boilers liable to be overpressed.
Dated this 26th March 1886.
WALTER A. BARLOW,
6, St. Paul's Churchyard, London, E.C.,
Agent for William Bragg.

page_text: I WILLIAM BRAGG of Guildford Street, York Road, Lambeth in the county of
Surrey 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 :-
This invention relates to certain improvements in safety valves and has for object to
alter the pressure on the valve, and this is effected by a system of varying fulcrums
for the pressing or weight lever so as that the valve shall not be liable to be over
pressed.
The invention is illustrated in the accompanying drawing, to which reference will be
made in the following description.
The body of the valve is made in a casting in convenient manner and with lugs or
bearings a, b, c to receive the slotted standard a¹ and fulcrum 6' of the pressing lever d,
and the link or links e in connection with such lever.
The pressing lever d is jointed at proper distance from the head of the valve, said
jointing being made in such manner by slotting the hole g. thereof so as to allow of the
fulcrum being varied or altered from g to e, thus when the pressure of steam raises
the valve h and lever d the fulcrum will be altered from g to e thereby decreasing the
load and when the valve and lever are at their highest position the fulcrum will be
again altered from e to g by means of the top of the slot bearing upon the pin passed
through said slot thus increasing the load, and the valve will then return to its seating
at its original pressure.
At the rear of this jointing or fulcrum of the pressing lever, the said lever has an
arm or extension d' which extension piece d' is jointed at its end by a link or links e
which are in their turn jointed to the bearing piece c, and the jointing of this tail end of
the lever and its link may be slotted to correspond to the slotting g. before described
for the first fulcrum of the lever.
In working: The valve is actuated by the steam, lever, and fulcrum, and its spring
or weight in the following manner.
The pressure of steam raises the valve and lever d. d' depresses the tail of the
lever by means of the radial action of the links e and by that action alters the weight
on the valve in exact proportion to the variations of the fulcrums and as the steam is
released in greater proportion so the valve will return to its seating with the original
pressure in such manner as not to render the boiler or boilers liable to be overpressed.
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 a safety valve the pressing lever d with slotted hole g and extension piece d'
jointed to the bearing piece e by the links e as and for the purpose herein described
and as shown in the drawing.
Dated this 28th December 1886
G. GWILT COTSWORTH & Co.,
60, Moorgate Street, E.C.,
Applicant's Agents.