Improvements in Pressure Gauges.
Year: 1890

page_text: Date of Application, 29th Apr., 1890-Accepted, 31st May, 1890
Improvements in Pressure Gauges.
I, JOHN JACKSON, of Suffolk House, Lawrence Pountney Hill, in the City of
London, Engineer, 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 :-
My invention relates to pressure-gauges and is designed to provide a simple,
light and efficient device for adjusting the parts in such a manner as to vary the
action of the gauge according to the range of pressure for which the said gauge is
to be adapted.
My improved device comprises a rod or arm on which is fitted a sliding block
connected with the free end of the curved tube or other part of the gauge which is
actuated by the variations of pressure so that, by moving the said sliding block in one
or the other direction along the said arm, the required adjustment of the gauge can
be effected.
In the accompanying drawing I have shown, in front elevation, one form of
pressure-gauge fitted with my improved adjusting device, the outer case, dial and
index needle or pointer of the gange being removed.
A is a tubular stem or support to which the various parts of the gauge are attached,
and which is constructed in any suitable manner. B is the tube or tubular chamber.
C is the spindle of the index needle, which is provided as usual with a pinion D
geared with a toothed segment E fixed on the spindle F.
My improved adjusting device, in this case, consists of a round rod, arm or tail-
piece G either formed upon the toothed segment E or secured to or fixed in the
spindle F of the said toothed seginent. Upon this rod or arm G is fitted a sliding
piece Hadapted to be moved along the said rod G in one or the other direction and
provided with a set-screw J whereby it may be secured in any position upon the
said rod or arm. The said sliding piece H is connected with the free extremity of
the tube or tubular chamber B by means of a link K and pins K', K' upon or about
which the said link can turn slightly to suit the varying relative positions of the
said sliding piece H and the extremity of the tube or tubular chamber B.
To vary the range of pressure for which the gauge is adapted, it is only necessary
to release the set-screw J and move the sliding piece H in one or the other direction
upon the rod G.
i
The said rod or tail-piece G can, moreover, be bent in one or the other direction,
should the indication of the index-needle or pointer be out of correspondence with the
actual pressure of the fluid.
By using a round rod or tail piece I obtain the further advantage that I am enabled
to adjust the block H very readily in such a manner as to bring it into the same
plane as the tube B, in case the said tube should be bent to either side.
It is obvious that other suitable means may be employed for varying the
position of the sliding piece H on the rod or arm G and for securing it in position
thereon.
The rod or arm can if desired be fixed at right angles to the toothed segment for a
diaphragm gauge, or it can be otherwise suitably arranged, according to the kind or
class of gauge in which it is employed. For instance it may be secured to the spindle
of the index-needle or pointer in an excentric gauge.
By my said invention I avoid unnecessary weight of the parts which would tend
to interfere with or impair the efficient working of the gauge, and I also simplify the
construction of the gauge.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I wish it understood that I
claim:-
First. An adjusting device for a pressure-gauge, comprising a rod or arm having
a sliding block fitted thereon and suitably connected with the tube or other part
actuated by the variations of pressure, for the purposes above specified.
1
Second. A pressure-gauge provided with my improved adjusting device constructed
substantially as described with reference to the accompanying drawing, for the
purposes specified.
Dated this o0th d of A 1000
=
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.