An Improved Gauge for Indicating Pressure or Weight.
Year: 1890

page_text: Date of Application, 1st Dec., 1890
Complete Specification Left, 25th Aug., 1891-Accepted, 10th Oct., 1891
PROVISIONAL SPECIFICATION.
An Improved Gauge for Indicating Pressure or Weight.
We, WILLIAM ADAMS, Jeweller and JAMES WOODFIELD, Junior, Mechanic,
both of West Bromwich in the County of Stafford, do hereby declare the nature of
this invention to be as follows, for "AN IMPROVED GAUGE FOR INDICATING
"
PRESSURE OR WEIGHT -
Our invention relates to the method of simplifying the mechanism actuating the
index finger of pressure gauges, in a more simple and compact manner than hitherto
made, and thus less likely to get out of order. On the inside of a circular box or
case containing the dial plate, as usually made for pressure gauges, which may be
made open or closed, we secure a small metal plate, which carries a small central
pinion actuating the index finger, the end of the shaft carrying pinion working in a
small bracket fastened to the aforesaid metal plate, on this plate a small pillar
forming a centre is secured, on which a small slotted piece or slide and bar works,
the scope or range of movement being adjusted by means of a screw passing
through the said slot or slide, and bar; at the other end of the said bar or con-
necting rod, a small jaw is formed to receive the end of a toothed rack, (which may
be either straight, curved, or any segment of a circle), which actuates the before
mentioned pinion, giving motion to the index finger in the usual manner.
At one end of the small slotted piece or slide before mentioned which is connected
to the bar, a small eye is formed for carrying a short rod or link, which is attached
to a disc or sheet of thin sensitive metal, (steel by preference) which said disc or
sheet of metal, (in combination with the parts herein described forms the basis of
our invention) is contained within or secured to the top of a small hollow chamber
or cylinder fastened to the rim inside of an ordinary circular box or case, to this
small hollow chamber is fixed a screwed nozzle, which is connected to a pipe in the
usual way, conducting the steam, water, gas or air, to the underside of the said
metal disc or sheet. The pressure acting on the metal disc or sheet would cause it
to bulge upwards, thus putting in action the short rod or link, the slotted piece or
slide, and bar, and the rack and pinion actuating the index finger, thus faithfully
indicating any varying pressure through the before mentioned pipe, and would also
impart a greater uniformity of motion, and less quivering of the index finger than
is generally the case. It is thus evident, that if a greater or lesser pressure whether
of steam, water, gas or air, be exerted against the metal disc or sheet, the gauge
will very accurately indicate the pressure applied. The tenacity and thickness of
the metal disc or sheet will vary with the pressure the gauge is required to indicate.
This arrangement of improved gauge, can be so made as to indicate weights of any
material by means of a rod connected to the metal disc or sheet, which would
impart the necessary pressure, causing the metal disc or sheet to rise or deflect,
according to the manner the weight should be applied, thus actuating the usual
mechanism before mentioned to move the index finger, which would then indicate
the weight.
D
of Nowamber 1800
ALFRED PERRY, Assoc. M. Inst. C.E.,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
An Improved Gauge for Indicating Pressure or Weight.
We WILLIAM ADAMS, Jeweller, and JAMES WOODFIELD, Junior, Mechanic,
both of West Bromwich, in the County of Stafford, 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:-
Our invention relates to the method of simplifying the mechanism actuating the
index finger of pressure gauges, in a more simple and compact manner than
hitherto made, and thus less likely to get out of order. On the inside of a circular
box or case containing the dial plate, as usually made for pressure gauges, which
may be made open or closed, we secure a small metal plate which carries a small
central pinion actuating the index finger, the end of the shaft carrying pinion
working in a small bracket fastened to the aforesaid metal plate, on this plate a
small pillar forming a centre is secured, on which a small slotted piece or slide and
bar works, the scope or range of movement being adjusted by means of a screw
passing through the said slot or slide and bar, at the other end of the said bar or
connecting rod, a small jaw is formed to receive the end of a toothed rack,
which may be either straight, curved, or any segment of a circle, which actuates
the before mentioned pinion, giving motion to the index finger in the usual
manner. At one end of the small slotted piece or slide before mentioned which is
connected to the bar, a small eye is formed for carrying a short rod or link, which
is attached to a disc or sheet of thin sensitive metal, (steel by preference) which
said diso or sheet in combination with the parts herein described forms the basis of
our invention, is contained within or secured to the top of a small hollow chamber
or cylinder, fastened to the rim inside of an ordinary circular box or case, to this
small hollow chamber is fixed a screwed nozzle, which is connected to a pipe in the
usual way, conducting the steam, water, gas or air, to the underside of the said
metal disc or sheet. The pressure acting on the metal disc or sheet would cause it
bulge upwards, thus putting in action the short rod or link, the slotted piece or slide
and bar, and the rack and pinion actuating the index finger, thus faithfully indicating
any varying pressure through the before mentioned pipe, and would also impart a
greater uniformity of motion and less quivering of the index finger than is generally
the case.
It is thus evident, that if a greater or lesser pressure, whether of steam,
water, gas or air, be exerted against the metal disc or sheet, the gauge will very
accurately indicate the pressure applied. The tenacity and thickness of the metal
disc or sheet will vary with the pressure the gauge is required to indicate.
This arrangement of improved gauge can be so made, so as to indicate weights
of any material, by means of a rod connected to the metal disc or sheet, which
would impart the necessary pressure that would cause the metal disc or sheet to
rise or deflect according to the manner the weight should be applied, thus actuating
the mechanism before mentioned to move the index finger, which would then indicate
the weight. And in order that our said invention may be fully understood, we
shall now proceed more particularly to describe the same, and for that purpose
shall refer to the several figures on the annexed sheets of drawings, the same letters
of reference indicating corresponding parts in all the figures. Figure 1. is a back
view of our improved gauge with the cover at the back removed for the purpose of
shewing the general arrangement of the working parts, this cover is seen in Figure 2,
marked a, which is a part vertical section of Figure 1. On the inside as shewn a
small metal plate marked b, which carries a small central pinion c, which_actuates
and sets in motion the index finger or pointer d, shewn in dotted lines at Figure 1.
The said small pinion c works in, and is carried by a small bracket e, which is
secured to the metal plate ō, before referred to, on this same plate is secured a small
pillar or stud marked f, shewn in Figure 2, to which is secured the part g, one end
of which is provided with a slot, the other portion forming a toothed rack, as shewn,

page_text: which actuates the before mentioned pinion c. In connection with the slotted
portion of the bracket g, a small connecting rod or bar h is secured, the other end
being secured to a stud marked i, provided with a jaw and pin on which the end of
the rod or bar / freely works; the said stud i is fastened to a disc or sheet of thin
sheet metal marked j, which may be slightly corrugated as shewn in Figure 2, for
favoring expansion. This sheet or disc j, is bedded and secured to the top of the
hollow chamber or cylinder marked k, which is fastened to the inside rim of the case
as shewn, the lower portion of the part k, is screwed as shewn for receiving the
connecting pipe in the ordinary method, for conducting the steam, water, gas or air
to the underside of the thin metal disc or sheet j. Thus it is evident that the
pressure acting on the corrugated or otherwise metal disc or sheet j, would cause it
to rise or bulge upwards, thus putting into action the rod or bar h, the bracket g,
the top portion of which actuates the pinion c, and the index finger d, thus faith-
fully indicating all the varying pressure conveyed to the hollow chamber k, as before
described. The scope or range of movement imparted to the toothed rack 9, is
adjusted by means of a screw passing through the end of the short connecting rod
or bar h, and the slot formed at the end of the bracket g as shewn. Figure 3
is merely a front view of Figures 1 and 2. Figure 4 is an enlarged view of the
small casting containing the hollow chamber k, the thin metal disc or sheet j, the
stud i, the short connecting rod or bar h, and the bracket or toothed segment 9, with
the slot shewn for the adjustment of the rod or bar h. It is evident that the details
can be somewhat varied without departing from the spirit of our invention.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim as our invention is:-
The great simplicity of the mechanism and the few parts employed in our gauge.
Also the placing of the whole of the working parts on the inside of the case, thus
giving protection to them from the atmosphere. The general arrangement and
combination of the parts as shewn, substantially, as, and for the purpose herein-
before described, and as illustrated in the accompanying drawings, for giving motion
to the index finger of gauges for indicating pressure or weight.
Dated this 24th day of August 1891.
ALFRED PERRY, Assoc. M. Inst. C.E.,
Agent for the Applicants.