IMPROVEMENTS IN PRESSURE GAUGES to be as follows:
Year: 1884

page_text: I JAMES BURDEN of Conybere Street Birmingham in the County of Warwick
Manufacturer do hereby declare the nature of said invention for "IMPROVEMENTS
IN PRESSURE GAUGES to be as follows:-
"
My invention has reference principally to that class of Steam pressure gauges of
the Schaffer type or rather a modification of the disc type, that is the annular
corrugated disc or diaphragm upon which the pressure of the steam acts is placed
in the back of the case of the guage carrying the dial and when so arranged a
greater superficial area is given to the pressure of the steam thereby producing
greater sensitiveness in the gauge.
The object of my present improvements is to impart greater steadiness and
prevent tremour to the parts transmitting motion or pressure from the disc or
diaphragm and also effecting greater security in the fittings of the said parts,
thereby producing an instrument or gauge more sensitive and reliable in indicating
pressure than heretofore.
Attached to the pressure diaphragmn situated in the back of the case is a headed
pin, which lies between the fork of a bell crank lever, jointed or centred near its
lower end and supported by a suitable bracket-The forked arms of the said crank
lever rests upon a bearing attached to the pressure diaphragm-The headed pin
described, limits the movement of the crank lever, and keeps the forked arms or
acting ends of the said lever to their proper bearing on the pressure diaphragm.
A connecting rod is attached and jointed to the long arm of the bell crank lover,
while its other end is connected and jointed to a cross head, and presses forward
the said cross-head.
The said cross-bead carries a long movement rod which communicates motion to
the crank axis carrying the pointing or recording instrument and thereby indicating
pressure by means of an index finger, which is supported by a suitable bracket at
the lower part of the case.
The terminal or upper part of the long movement rod works within a fixed or
swivelling guide for producing perfect steadiness and parallelism in the action of
the movement.
A coiled spring is attached to the one side of the cross-head while the other is
attached to the fixed case,

page_text: This spring assists the return movement of the various parts to their normal
positions.
The action of the gauge is as follows-
Pressure exerted on the back of the diaphragm flattens out the annular
corrugations in the plate and by the deflection raises the forked ends of the bell-
crank lever, imparting motion to the long arm, and the connecting rod to the
cross-head or carrier, and to the movement rod, which rotates, the axis carrying the
index finger by means of a cranked arm which is secured to the spindle carrying
the index finger to which the lower end of the movement rod is connected; the
forward movement of the cross-head extends the coiled spring attached thereto,
while the forward end of the movement rod passing through the fixed or swivelling
guide, supports and determines the perfect parallelism and free movement of the
parts and also imparting great steadiness, security of all parts and sensitiveness
without tremore or oscillation to the gauge.
On the relaxation of pressure behind the diaphragm the parts return to their
normal position by the headed pin bringing back the forked end of the crank lever,
assisted by the coiled spring.
Although I have only described my invention as applied to a diaphragm or dise
gauge, yet my improvements are equally applicable to pressure gauges generally.
Dated this twenty-fifth day of February one thousand eight hundred and

page_text: I, JAMES BURDEN of Conybere Street, Birmingham, in the County of Warwick,
Manufacturer, do hereby declare the nature of said invention for "IMPROVEMENTS
IN PRESSURE GAUGES," and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
My invention has reference principally to that class of steam pressure gauges of
the Schaffer type or rather a modification of the disc type; that is, the annular
corrugated disc or diaphragm upon which the pressure of the steam acts, is placed
in the back of the case of the gauge carrying the dial, and when so arranged a
greater superficial area is given to the pressure of the steam, thereby producing
greater sensitiveness in the gauge.
The object of my present improvements is to impart greater steadiness and
prevent tremour to the parts transmitting motion or pressure from the disc or
diaphragm and also effecting greater security in the fittings of the said parts
thereby producing an instrument or gauge more sensitive and reliable in indicating
pressure than heretofore.
Attached to the pressure diaphragm is a knob or rise which lies under the fork
of a bell crank lever jointed or centred near its lower end-A spring limits the
movement of the crank lever, and keeps the forked or acting end of the said lever
to their proper bearing on the pressure diaphragm.
A connecting rod is attached and jointed to the long arm of the bell-crank lever,
while its other end is connected and jointed to a cross head and presses forward the
said cross head.
The said cross head carries a long movement rod, which communicates motion to
the crank axis carrying the pointing or recording instrument and thereby indicating
pressure by means of an index finger, which is supported by a suitable bracket at'
the lower part of the case.
The terminal or upper part of the long movement rod works within a fixed or
swivelling guide for producing perfect steadiness and parallelism in the action of
the movement.
A coiled spring is attached to the one side of the cross head while the other is
attached to the fixed case.
This spring assists the return movement of the various parts to their normal
positions.
.
The action of the gauge is as follows.
Pressure exerted on the back of the diaphragm flattens out the annular
corrugations in the plate and by the deflection raises the forked ends of the bell
crank lever, imparting motion to the long arin, and the connecting rod to the cross
head or carrier, and to the movement rod which rotates the axis carrying the index
finger by means of a cranked arm which is secured to the spindle carrying the
index finger to which the lower end of the movement rod is connected-The forward
movement of the cross head extends the coiled spring attached thereto, while the
forward end of the movement rod passing through the fixed or swivelling guide,
supports and determines the perfect parallelism and free movement of the parts and
also imparting great steadiness, security of all parts and sensitiveness without,
tremour or oscillation to the gauge.
On the relaxation of pressure behind the diaphragm, the parts return to their
normal positions by the headed pin bringing back the forked end of the crank
lever, assisted by the coiled spring.

page_text: Although. I have only described my invention as applied to a diaphragm or dise
gauge, yet my improvements are equally applicable to pressure gauges generally.
I will now proceed to describe with reference to the accompanying Drawing the
manner in which my invention is to be performed.
Figure 1 represents in front elevation the front of a pressure gauge, and figure
the same with the dial plate removed; the parts being arranged and constructed
according to my invention, the said figure 2 shows the movements of the gauge in
the positions which they respectively assume, when the gauge is in its normal
position Figure 3 also, represents the gauge with its dial plate and front parts
removed as in figure 2; the movements of the gauge are shown in the positions
they assume, when full pressure is exerted upon the' disc or diaphragm at the back
of the case-The movements so arranged become the recipient to the disc's
inflection, in indicating pressure-Figure 4 is a transverse vertical section of
figure 1 taken on the dotted lines.
•
The same letters of reference indicate the same parts in the several figures of
the Drawing.
a is the case of the gauge containing the movements and fittings-b is a corrugated
disc or diaphragm, the amount of inflection or bending inwards, determines the
pressure of steam exerted at its back-c is the graduated dial before which the
finger d traverses-e is a bell crank lever for, transferring the motion of the disc's
inflection to the movements, for rotating the finger axis fe² is a coiled spring, for
keeping the foot of the lever eto its proper bearing on the pressure diaphragm-
g is a connecting rod attached at its front end to the long arm of the lever e, while
its other end is jointed to a cross head or carrier h, the said cross head has fixed to
it and carries a long movement rod i, which communicates motion to the finger
axis f, by; the swivelling crank j-The terminal or upper part of the long movement
rod works within a fixed or swivelling guide for giving steadyness and
parallelism to the action of the movements is a coiled, spring for bringing back
the parts to their normal positions and acting as a buffer for preventing oscillation
on the relaxation of the diaphragm's inflection-The movements are supported by.
brackets m, no is the steam passage passing to the back of the gauge.
The action of the gauge is as follows-
On steam passing up the passage o, pressure is exerted on the back of the
diaphragm b and flattens out the annular corrugations in the plate-The inflection
of the disc carrying the bearer 6 turns the crank lever e upon its fulcrum, imparting
motion in the direction of the arrow, to the connecting rod g and cross head or
carrier h carrying forward the rod i which is attached to and moves with the said
carrier.
The forward movement of the rod turns the arm or crank ; which is fixed on
the finger axis f, and thereby imparts motion to the said axis, which moves the
indicating finger before the graduated dial, and so indicates thereon the pressure of
steam as represented in figure 3; and further, the movement of the cross head h
compresses the spring 1, and the movement of the rocking lever e extends the
spring e², while the movement forward of the rod i passing through the fixed or
swivelling guide ; supports and determines the perfect parallelism and free
movement of the, parts, and also imparting great steadiness and security with
sensitiveness free from tremour or oscillation.
On the relaxation of pressure behind the diaphragm, the parts resume their
normal position as represented in figure 1.
Although I have only described my invention as applied to a diaphragm or disc
steam gauge, yet my improvements are equally applicable to pressure gauges
generally.
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
First. The improvements in pressure gauges hercinbefore described and illustrated
in the accompanying Drawing; that is to say, constructing and arranging the parts

page_text: of pressure gauges, whereby the inflection or change of figure of a corrugated
diaphragm or other pressure recipient imparts motion to an index finger through a
fulcrumed lever e and link g to a cross head h carrying a rod i, which is guided by
a fixed or swivelling bracket k in which it slides, the parts being arranged, combined
and operating in the way and for the purpose as described and set forth.
Secondly. The link g and slide h, swivelling or fixed guide k and springs land e
for imparting steadiness and giving security to the parts of pressure gauges as
described and represented.
1
ז.
4001