Improvements in the Construction and Mounting of Safety Valve Levers.
Year: 1895

page_text: Date of Application, 1st Feb., 1895
Complete Specification Left, 1st Nov., 1895-Accepted, 7th Dec., 1875
PROVISIONAL SPECIFICATION.
Improvements in the Construction and Mounting of Safety Valve
Levers.
I, GEORGE MAULE MARCHANT of Chapel Hill Brass and Iron Works, Chapel
Hill, Huddersfield, in the County of York, Brass Founder, do hereby declare the
nature of this invention to be as follows:-
This invention relates to the levers of safety valves used on steam boilers and
other vessels, and has for its object, the construction and mounting of the levers
in such a manner, that the danger of the lever becoming inoperative by rust or
accumulation of dirt between the levers and the forked joints of valve spindle
and bracket support, is obviated by dispensing with the said forked joints as
ordinarily constructed, and to make the action of the valves more sensitive by
forming and mounting the levers so that the friction on the working parts is reduced
to a minimum.
I accomplish my object in the following manner. The valve spindle or cap on
the top of same is formed taper, terminating at the top with a sharp edge over
the centre of the valve spindle. This sharp edge fits into a V-shaped recess formed
on the underside of the safety valve lever, I form a similar recess on the top side
of the lever at the fulcrum end. This fulcrum end of the lever is inserted in a
slot hole wider than the lever, and engages with the sharp edge of a V-shaped support
as fulcrum, so that by this arrangement, no pins are required for connecting the
lever to the valve spindle or for the fulcrum, thereby reducing the friction to a
minimum, and in a corresponding degree increasing the sensitiveness of the valve.
Dated this 29th day of January 1895.
JOHN WAUGH,
Agent.
Improvements in the Construction and Mounting of Safety Valve
Levers.
I, GEORGE MAULE MARCHANT, of Chapel Hill Brass and Iron Works, Chapel
Hill, Huddersfield, in the County of York, Brass Founder, 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 the levers of safety valves used on steam boilers and
other vessels, and has for its object the construction and mounting of the levers
in such a manner that, the danger of the lever becoming inoperative by rust or
accumulation of dirt between the lever and forked joints of the valve spindle and
bracket support is entirely obviated, by dispensing with the said forked joints as
ordinarily constructed; and to make the action of the valve more sensitive by
forming and mounting, the levers so that the friction on the working parts is reduced
to a minimum. .
In the accompanying drawings Fig. 1 represents an elevation of a safety valve
partly in section and fitted with a lever and supports arranged according to my
invention.

page_text: Fig. 2 is an elevation of the top portion of a valve spindle.
Fig. 3 is an elevation of a portion of a lever constructed according to my invention,
the dotted lines showing the lever raised, and
Fig. 4 a similar elevation of a lever constructed in the manner as hitherto, the
dotted lines showing the lever raised.
The safety valve may be constructed in the ordinary manner, the spindle A. is
by preference provided with a cap B. terminating at the top with a sharp edge C.
over the centre of the valve spindle A. or in place of the said cap, the end of
the spindle A. may terminate with a similar sharp edge to that shown at C. over
the centre of the said spindle.
This sharp edge fits into a V shaped recess D. formed on the underside of the
safety valve lever E. and at the fulcrum end of the lever, I form a similar recess on
the top at F; the top of the recess D. is slightly below the bottom of the recess
at F. so that when the lever E. is raised as shown by the dotted lines in Fig. 3 the
recess D. does not leave the centre of the valve spindle in the manner as shown
by Fig. 4, but remains over the centre, therefore does not press against and bind
the spindle A. against the side of the opening through the valve cover J. as is the
case when the lever is constructed as hitherto.
The fulcrum end of the lever is inserted in a slot hole wider than the lever and.
formed in the support G. the top side of the said hole being constructed with a
sharp edge at H. as fulcrum for engaging wish the before mentioned recess F.
formed in the end of lever E.
By forming a recess on each side of the lever as shown, or bringing the sharp
edge C. at top of safety valve spindle A. and the sharp edge at H. into
near the same line as shown by the recesses D. and F. in Fig. 3, the friction
of the spindle A. through the cover J. is reduced, also by so mounting the
lever, no pins are required for connecting the lever .E. to the valve spindle A. and
to the fulcrum support G. thus by this arrangement, the valve is rendered more
sensitive by reducing the friction between the lever E. and spindle A. and the
support G.
It will be obvious. to persons having a knowledge of safety valves, that my object
may be accomplished by forming the V recesses in the end of valve spindle A.
and fulcrum support G. and the sharp edges on the lever E. in suitable positions
for engaging with the respective recesses, in place of arranging them as shown and
described; the sharp edges on the lever in this case terminating near to each other,
that is to say, each terminate a short distance from a line K. passed through the
lever longitudinally.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is,
1. In a safety valve the combining with the valve of a lever E. provided with
a V recess on the top and one on the bottom edge of the same in such positions as
to engage with the respective sharp edges on the valve spindle A. or cap B. on
same, and with H. on the fulerum support G. all arranged substantially in the
manner as shown and described.
2. In a safety valve the combining with the valve of a lever E. provided with
sharp edges for engaging with V recesses formed in the end of valve spindle A. or
cap B. on same and in fulcrum support G. all arranged substantially in the
manner as hereinbefore set forth.
Dated this 30th day of October 1895.
JOHN WAUGH,
Agent.