Improvements in and relating to Pressure Gauges and like Instruments.
Year: 1896

page_text: Date of Application, 10th Feb., 1896
Complete Specification Left, 8th Dec., 1896-Accepted, 9th Jan., 1897
PROVISIONAL SPECIFICATION.
Improvements in and relating to Pressure Gauges and like
Instruments.
I, FRANCIS BEEBY, of Abercorn House, 9 Castletown Road, West Kensington,
in the County of Middlesex, Barrister-at-Law, do hereby declare the nature of
this invention to be as follows:-
This invention relates to pressure gauges and like instruments. The object as
respects pressure gauges is to show simultaneously the pressure at the moment of
observation and the maximum pressure since the instrument was last set. As
respects vacuum gauges and the like the object is to give analogous simultaneous
indications.
In a pressure gauge according to my invention steam acts upon two independent
gauge mechanisms each of which may consist of a piston working against a spring.
Each piston by means of teeth, gears with a separate pinion, each pinion operates
an index finger and both fingers move over the same dial. One index finger may
he moved from right to left and the other from left to right, the dial being
graduated accordingly. A click or pawl is provided which takes into the teeth of
one of the pinions and prevents the return of one of the index fingers.
When steam acts upon the gauge, both pistons will be moved, each index finger
will travel and each will indicate the same pressure, when the pressure falls one
index finger will indicate the true pressure but the other index finger however will
continue to indicate the maximum pressure (or offer a like indication) its return
being prevented by the click or pawl.
In order that the instrument may not be tampered with by admitting the steam
to act upon the normal gauge alone, and not upon the maximum gauge, the steam
is caused to pass through a three way cock or valve so arranged that the
steam can be shut off altogether, or made to act upon the maximum gauge
alone, or upon both gauges but cannot be made to act upon the normal gauge
only.
The gauge may be surrounded by an outer steam tight casing and the space
between the two casings supplied with steam in such a manner that when steam is
acting upon the maximum gauge it will also fill the space between the casing and
any attempt to alter the index finger by drilling a hole in or tampering with the
casing will cause an escape of steain shutting off steam altogether.
The index finger of the maximum gauge is from time to time set to zero by the
inspector or person whose duty it is to do so; a reliable and effective check is thus
obtained upon the pressure to which a boiler has been subjected.
According to a modification in order to use existing gauges, the dial of the
maximum gauge is separated from that of the normal gauge: the above described
three way cock or valve prevents the normal gauge being used by itself. In this
case the maximum gauge may be placed in a manager's office, or in a captain's
cabin for their own independent supervision.
The fittings are so arranged that if a gauge becomes deranged a new gauge can
readily and easily be substituted and without any loss of time or expense.
Dated this 8th day of February 1896.
FRANCIS BEEBY.

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Pressure Gauges and like
Instruments.
I. FRANCIS BEEBY, of Abercorn House 9 Castletown Road, West Kensington
in the County of Middlesex, Barrister-at-Law, 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 and like instruments. The object as
respects pressure gauges is to show simultaneously the pressure at the moment of
observation and the maximum pressure since the instrument was last set. As.
respects vacuum gauges and the like the object is to give analogous simultaneous
indications.
In a pressure gauge according to my invention steam acts upon two independent
gauge mechanisms each of which may consist of a piston working against a spring.
Each piston by means of teeth on an intermediate segment or otherwise, gears with a
separate pinion, each pinion operates an index finger and both fingers move over
the same dial. One index finger may be moved from right to left and the other
from left to right, the dial being graduated accordingly. A click or pawl is
provided which takes into the teeth of one of the pinions and prevents the return
of one of the index fingers.
When steam acts upon the gauge, both pistons will be moved, each index finger
will travel and each will indicate the same pressure. When the pressure falls one
index finger will indicate the true pressure but the other index finger will continue
to indicate the maximum pressure (or offer a like indication). its return being
prevented by the click or pawl.
In order that the instrument may not be tampered with by admitting the steam
to act upon the normal gauge alone, and not upon the maximum gauge, the steam
is caused to pass through a three way cock or valve so arranged that the steam can
be shut off altogether, or made to act upon the maximum gauge alone, or upon both
gauges but cannot be made to act upon the normal gauge only.
The guage may be surrounded by an outer steam tight casing and the space
between the two casings supplied with steam in such a manner that when steam is
acting upon the maximum gange and normal gauge it will also fill the space
between the casing and any attempt to alter the index finger by drilling a hole in
or tampering with the casing will cause an escape of steam shutting off steam
altogether.
In order that my invention may be fully understood and readily carried into
effect I will proceed to illustrate my invention with drawings.
Figure 1 is a sectional elevation of a pressure gauge constructed according to
my invention.
Figure 2 is a section on a larger scale of the three way cock showing the same
closed.
Figure 3 is a similar view showing the same when open to the maximum gauge,
and Figure 4 shows the position when the cock is open to both gauges.
In these figures a a' are cylindrical chambers in which are fitted steam tight
pistons bb. The chambers are surrounded with an outer metal casing c.
Steam
entering through the pipe d passes, when the plug e is in the position shown in
Fig. 4, through the passages ff into the chainbers a a' and into the space left
between the chambers and the outer casing c. The steam raises both pistons b b'
against the action of the springs g g' thereby rotating the index fingers h h¹ by
means of the connecting rods and quadrants and the pinions ii. On the same

page_text: axis with the pinion i¹ is a ratchet & into the teeth of which takes a pawl / thereby
allowing the index finger h¹ to turn in one direction only.
When the valve e is in the position shown in Figure 3 steam passes into one
chamber a¹ only and into one half only of the space left between the chambers and
the outer casing c, a partition m preventing the steam from filling the remaining
space.
As will be observed stops are so placed on the valve casing that the valve can
never be moved to such a position that steam can act upon the piston 6 without at
the same time acting upon the piston b¹.
The index finger h' of the maximum gauge is from time to time set to zero by
the inspector or person whose duty it is to do so; a reliable and effective check is
thus obtained upon the pressure to which a boiler has been subjected.
According to a modification in order to use existing gauges, the dial of the
maximum gauge is separated from that of the normal gauge, the above described
three way cock or valve prevents the normal gauge being used by itself. In this
case the maximum gauge may be placed in a manager's office or in a captain's
cabin for their own independent supervision.
The fittings are, as will be seen, so arranged that if a gauge becomes deranged
a new gauge can readily and easily be substituted and without any loss of time or
expense.
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. In pressure gauges and like instruments the combination substantially as
described of two gauge mechanisms independently rotating two index fingers, one
of said mechanisms and index fingers being able to move freely to and fro, the
other said mechanism and index finger being able to move freely in one direction
only.
2. In pressure gauges and like instruments the combination of a three way
cock or valve, and of two passages or pipes one communicating with an ordinary
gauge, the other with a maximum gauge, substantially as and for the purpose
described.
3. The pressure gauge substantially as described and shown in the drawings.
FRANCIS BEEBY.