IMPROVEMENTS IN THE CONSTRUCTION OF WEIGHING APPARATUS
Year: 1884

page_text: I THOMAS MOY of 8 Quality Court Chancery Lane in the County of Middlesex,
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
THE CONSTRUCTION OF WEIGHING APPARATUS to be as follows:-
The object of my invention is to construct a simple form of apparatus for
weighing articles and things, in an efficient manner; such apparatus having no
wearing surfaces; requiring no moveable weights, and being without liability to get
out of order, or become inefficient or incorrect.
I form such apparatus with one central pulley or portion of a pulley, to which is
fixed two pullies or portions of pullies; the three portions being usually formed in
one casting.
The pullies are of different diameters, that is to say, two largo and one small, or
two small and one large.
The centres of two of the pullies are coincident and in line with each other, but
are eccentric to the single pulley.
Chains, cords or bands partially surround each of the pullies: one chain passing
downwards and sustaining the weight of the goods, and two passing upwards to a
suitable support, whereby the same is suspended; or two may be carried
downwards to the goods, and one upwards to the main support.
On the face of one of the pullies a suitable hand or index is fitted upon a centre,
and a scale for indicating the weight of the goods is also fitted or engraved
thereon.
The result of the aforesaid arrangement is that the various loads are sustained
by a lever with a shifting fulcrum, which fulcrum shifts towards the point of
suspension of the apparatus, beyond which line it cannot pass.
My said apparatus can be made of any size, and to weigh any quantity or weight
of goods.

page_text: I, THOMAS MOY, of 8 Quality Court, Chancery Lane, in the County of Middlesex,
Engineer, do hereby declare the nature of my said Invention for "IMPROVEMENTS
IN THE CONSTRUCTION OF WEIGHING APPARATUS" and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:-
The object of my invention is to construct simple forms of apparatus for
weighing articles and things, by substituting rolling contact for knife edges and
pivots, and also substituting shifting fulcra and variable leverages for moveable
weights.
And in order that my said invention, together with the developments which
have been made therein since filing my provisional specification, may be clearly
understood, reference is hereby made to the accompanying drawings, in which
similar letters of reference indicate corresponding parts in the several figures.
Fig. 1 is a large grooved pulley or disc, with two smaller grooved pullies fixed
thereto; a is the large pulley, and b one of the smaller pullies. Let c be the centre
of gravity of the mass, d one of the cords or chains of suspension, and e a cord or
chain to which the goods to be weighed are attached: as the weight on c is
increased the tendency of the mass to assume the position shewn in Fig. 2 will, in
like manner, be increased, until equilibrium is established between the weights and
the leverage.
In Figs 1 and 2 one large pulley and two small pullies are adopted, a section of
which, on the line 1, 2, is shewn in Fig. 12 whereby it will be readily understood.
The discs or pullies may be solid, hollow, built up, or otherwise formed, and a
pocket is usually made at or near c in order to arrange the centre of gravity with
precision, for facility of manufacture.
In Fig. 3 two large pullies are shewn with one small central pulley, a section of
which is shewn in Fig. 13. Finding that the range of circular motion is not large,
I have shewn in Fig. 4 an arrangement comprising portions of grooved pullies, in
which figure a is a plate of metal which sustains two three or four grooved sectors
as a' and b. A section of this figure is shown in Fig. 14.
The last mentioned arrangement may be modified and arranged as shewn in
Fig. 5, and, in section, in Fig. 15. In this arrangement two plates a a sustain
between them two sectors al ', to which the respective cords are attached.
In Fig. 6 the sector is reduced to allow the strut f to pass up between the
walls, to which strut the cord d is attached.
Fig. 7 shews another modification, in which, if preferred, but one sector a, one
disc, b, a single cord & and cord e may be used, by omitting the sector and pulley
on the opposite side.
Fig. 8 is another modification, which is also shewn in section in Fig. 16.
Fig. 9 is also a modification, shewing pullies a¹ and b¹' of unequal sizes between
plates a.
Fig. 10 shews one method of mounting the apparatus as a letter balance, the
arrangement being specially applicable to Figs. 1, 2, 3, 4, 5, 7, 8, 9, 12, 13, 14, 15
and 16.
Fig. 11 shews one method of mounting the apparatus shewn in Fig 6.
The hand or index g is free to revolve on a pivot, and is made to indicate the
exact weight of the goods.
The plates are shewn as circular discs in the drawings, but this shape may be
departed froin, and other fanciful or ornamental forms may be adopted, and the
plates may be loaded to increase the range of the apparatus.

page_text: The cords of suspension may be of any suitable material, as silk, cord, catgut,
wire or other rope, chain, flexible steel rack and pinion or bands, the ends being
fastened to the respective discs, pullies, or sectors, by means of knots, staples,
screws, studs or otherwise.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the saine is to be performed, I would have it
understood that I do not limit myself to any relative proportion or diameters of
the pullies, rolling surfaces, or sectors, and I declare that what I claim is:-
1 The method of and means and appliances for substituting rolling and contact
surfaces for the ordinary knife edges and pivots, substantially as and for the
purposes herein before described and shewn on the drawings.
2 The method of and means and appliances for indicating the weight of
materials, substantially as herein before described and shewn on the drawings.
3 The manufacture and use of weighing apparatus constructed and operating
substantially as herein before described and shown on the drawings.
Date 1001