Improvements in and connected with Pressure Gauges.
Year: 1890

page_text: Date of Application, 6th Dec., 1890-Accepted, 10th Jan., 1891
COMPLETE SPECIFICATION.
[Communicated from abroad by the firm of SCHAFFER AND BUDENBERG, of Buchau,
Magdel.urg, in the German Empire, Engineers.]
Improvements in and connected with Pressure Gauges.
I, WILLIAM EDWIN HEYS of 70 Market Street Manchester in the County of
Lancaster, Patent Agent, 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 pressure gauges constructed to be used on traction
engines and in other positions where they will be liable to be subject to considerable
vibrations.
In a gauge constructed according to these improvements, a diaphragm having
concentric corrugations as in the well known "Schaeffer Gauge" is employed but the
diaphragm instead of being horizontal is arranged vertically and so that steam
has access to the back of the diaphragm. In front of the diaphragm there is an
L-shaped lever pivoted at its angle and bearing by one of its members on the centre
of the diaphragm. The other member of the lever passes through a slot in a sliding
bar which is connected at one end to a crank pin secured upon the index finger
spindle. Consequently, the motion of the diaphragm is communicated through the
L-shaped lever, the sliding bar, and the crank pin to the index finger. Above the
sliding bar there is a fixed bar having therein a longitudinal slot in which the outer
member of the L-shaped lever works and which prevents lateral motion in that
lever.
I will more particularly describe the said invention with reference to the
accompanying drawings in which
and
Figure 1 is a front elevation of the gauge with the dial and front plate removed,
Figure 2 a vertical transverse section.
Similar parts are denoted by similar letters of reference in each of the figures.
A is the steam inlet communicating with the chamber at the back of the
diaphragm B. C is a ring between which and the body of the gange the diaphragm
is secured by means of the set screws D. E is the L-shaped lever the inner member
of which is preferably supplied with a light adjusting screw F the point of which
(and not the lever itself) rests upon the contact piece which is fixed upon the centre
of the diaphragm. G is the sliding bar through which the motion of the lever E is
communicated to the index-finger pivot H. This sliding bar has near its upper end a
longitudinal slot 1 engaging the fixed pin or screw J which permits the longitudinal
motion of the bar G and prevents its lateral and outward motions. In the bar G
there is also formed a slot K through which the outer member of the lever E passes.
This outer member is preferably round and, since the lower end of the bar G moves.
through the arc of a circle as will be hereinafter made clear, the slot is formed of
a greater length across the bar than the diameter of the part of the lever passing
through it, whilst the width of the slot in the direction of the length of the bar is
such that the end of the lever E just moves freely therein in all positions. The
other end of the bar G is curved to clear the index finger spindle and is connected
with a crank pin L fixed upon a small plate or disc secured upon the spindle. Mis
a fixed bar above or outside the bar G and it has formed in it a longitudinal slot N
in which the outer end of the lever E freely fits and moves. This slot prevents side
motion of the lever E. O is a light spiral spring connected at one end to the fixed
book P and at the other end to a book fixed or formed upon the bar G. This
spring is not essential but its use facilitates the return of the finger to zero after
[DC

page_text: the pressure is withdrawn. R (Figure 2) is the dial and S is the index finger. In
Figure 1 the dial, front plate, and the bar M are removed in order that the inner
parts or details of the gauge may be more clearly seen.
When the pressure is exerted upon the back of the diaphragm an outward motion
is imparted to the inner limb of the lever E and a resultant upward motion to the
outer limb in the slot K; the sliding bar is consequently moved and translates the
motion of the diaphragm to the spindle of the index finger.
It is desired to be understood that no claim is herein made for the arrangement
of the diaphragm or for an angular or bell crank lever as one of the details of the
mechanism which translates the motion of the diaphragm to the index finger.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is―
1. A pressure gauge constructed and arranged substantially as and for the purpose
bereinbefore described and as illustrated by the accompanying drawings.
2. In a pressure gauge having a vertically arranged diaphragm, the combination
and arrangement of an angle lever provided with an adjusting screw, a sliding bar
operated by the angle lever, and a crank pin mounted upon a plate fixed to the
index finger and connected to the sliding bar; substantially as and for the purpose
hereinbefore described and as illustrated by the accompanying drawings.
Dated this 5th day of December A.D. 1890.
WILLIAM E. HEYS.