Year: 1894

page_text: Date of Application, 19th Apr., 1894
Complete Specification Left, 18th Jan., 1895-Accepted, 23rd Feb., 1895
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I, WILLIAM DANIEL ALLEN, of Endcliffe, Sheffield, in the County of York,
Steel Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to a hydrostatic or liquid weighing apparatus where
the influence or weight of the load to be weighed is brought to bear upon a
perfectly air tight closed chamber full of liquid from whence the bydrostatio
pressure thereby created is transmitted to a gauge, and the weight of the load
indicated.
In constructing my machine 1 make the closed chamber or some portion of it
elastic, by the use of india rubber, thin sheet steel, or by some similar means, so
that when the load is brought to bear upon the chamber, its elasticity admits of the
influence of the load being felt by the liquid contents of the chamber, and the
pressure thereby brought to bear upon the liquid may by suitable connection be
transmitted to a gauge, that will indicate the load.
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10th of Al 1901
7
1, WILLIAM DANIEL ALLEN, of Eudeliffe, Sheffield, in the County of York,
Steel Manufacturer, 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 has reference to a hydrostatic or liquid weighing-apparatus where
the influence or weight of the load to be weighed is brought to bear upon a
practically air-tight closed chamber full of liquid, whence the hydrostatic pressure
thereby created is transmitted to a gauge, and the weight of the load indicated.
In constructing my machine or apparatus I make the closed chamber, or some
portion of it, elastic, by the use of india-rubber, thin sheet steel, or by some similar
means, so that when the load is brought to bear upon the chamber, its elasticity
permits the influence of the load to be felt by the liquid contents of the chamber,
and the pressure thereby brought to bear upon the liquid may by suitable
connection, be transmitted to a gauge that will indicate the load.
In the accompanying drawings,
Fig. 1 is a plan, and
Fig. 2 a vertical cross-section showing a closed chamber of the kind referred to,

page_text: Fig. 3 is an elevation and
Fig. 4 a plan partly in section on the line a Fig. 3, showing to a smaller scale,
the complete hydrostatic weighing apparatus and the mode of using the same.
Fig. 5 is a detail view.
•
In the example shown the chamber 1 is formed between two discs 2 & 3, of
which 2 is of thin sheet steel and 3 is of steel plate. The discs 2 & 3 are kept
apart by a lead packing or joint ring 4 and are secured together so as to form a
fluid tight joint with the ring 4, by means of a metal ring 5 and bolts 6, a lead packing-
ring 7 being placed between the ring 5 and the disc 2. Passages 8 and 9 in the ring 5
communicate with the chamber 1 through corresponding holes in the lead ring 7
and the disc 2 and through recesses 10 in the ring 4 (Fig. 5). From the passages 8
and 9, pipes 11 and 11 respectively lead to a pressure-gauge 12 for indicating the
weight on the chamber and to a pump (not shown) by means of which air can be
expelled from, and liquid forced into, the chamber 1 and the pipe 11. When in
use, the disc 2 rests on a sufficiently firm circular base 13 (Fig. 3) indicated in
dotted lines in Fig. 2, which is co-axial with the chamber 1 and is of sufficiently
less diameter than the said chamber, as shown, to allow of the proper bending of
the disc 2 under the action of a load resting upon the disc 3.
In Fig. 4 the hydrostatic weighing apparatus is shown applied in connection with
a hydraulic lift. In this case the cylinder 14 of the lift is entirely supported by
the disc 3, the arrangement as will be seen being such that the weight of any load
placed on the table or platform 15 of the hydraulic plunger 16, will be immediately
indicated by the gauge 12, which is graduated to allow for the weight of the
cylinder 14, and the parts carried thereby. 17 and 18 are cocks in the pipes 11
and 11 respectively for closing these pipes after they and the chamber I have
been freed from air and filled with liquid.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
i. Hydrostatic weighing-apparatus comprising a fluid tight chamber adapted to
be filled with liquid and provided with an elastic portion, such as a thin steel plate,
adapted to bear the load to be weighed, and a pressure gauge, the arrangement
being such that when the chamber is carried by a suitable support and the load to
be weighed is brought to bear upon it, the elastic portion of the chamber will yield
and cause the liquid within the chamber to be subjected to pressure which will be
indicated by the gauge, substantially as herein described.
2. My improved hydrostatic weighing-apparatus substantially as herein before
described with reference to and shown in the drawings annexed.
Dated this 18th day of January 1895.
WILLIAM DANIEL ALLEN.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.