Improvements in Weighing Machines.
Year: 1890

page_text: Date of Application, 1st Oct., 1890
Complete Specification Left, 1st July, 1891-Accepted, 12th Sept., 1891
PROVISIONAL SPECIFICATION.
| Communicated from abroad by HEINRICH WELB, of 35, Bergerstrasse, Frank-
fort-on-the-Main, in the German Empire, Manufacturer.]
Improvements in Weighing Machines.
1, ERNEST DE PASS, of 78 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of this invention to be
as follows:-
This invention consists in using with weighing machines having double beams,
running weights in the form of sliding blocks which are arranged in two series
which must be proportioned to the weighting capacity of the two beams. This is
for the purpose of obviating too large a weight in the second series so that by
means of this invention it will be possible to use the system of sliding weights with
weighing machines having double beams and used for heavy loads.
The proportion of the sliding weights of each series must, of course, remain as
one to ten.
In carrying out the invention four sliding weights are arranged in pairs in two
grooves or guides, the latter being fixed to or formed in the parallel weighing
beams. The whole is arranged in such a manner that the top surfaces of the
different sliding weights are in the same plane when the machine is at rest, for the
purpose of insuring a simultaneous impression or printing of the figures representing
the result of the weighing.
The distances of the balancing or poising points of the two beams are so chosen
that the leverage of one beam is ten times greater than that of the other. The
whole weight of one series will therefore be only ten times greater than that of the
other series, while formerly it was necessary for it to be 100 times greater.
It must of course be understood that the proportion of the sliding weights, and
the leverage of the beams may be arranged otherwise to suit circumstances.
The number of sliding weights depends upon the weighing capacity of the
machine.
1
1000
COMPLETE SPECIFICATION.
Improvements in Weighing Machines.
I, ERNEST DE PASS, of 78 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, 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, reference being had to the
accompanying drawings and to the letters and figures marked thereon, that is
to say :-
This invention consists in using with weighing machines having double beams,
sliding weights in the form of bars, or rods which are furnished with figures or
numerals arranged in such a manner that in the act of weighing, certain of these
figures will be brought into line beneath a registering device so as to permit of an
impression representing the result of the weighing to be registered upon a card or
the like.
The sliding weights may be of any suitable number, and are arranged in two
series which are so proportioned as to suit the weighing capacity of the machine.
By the use of this invention I obviate too large a weight in the second series,

page_text: and thus permit of the use of sliding weights with weighing machines having
double beams and adapted for heavy loads.
In the accompanying drawings Fig. 1 is a front elevation and Fig. 2 a plan of
the upper portion of a weighing machine constructed according to this invention
and provided with six sliding weights arranged in two series. Figs. 3 and 3B are
cross sections taken respectively on the lines X X and Y Y of Fig. 1; and Fig. 3A
is an end view of Fig. 1 as seen from the right.
A and B are the two beams, A being the counterweight beam, and B the
second beam. These are arranged side by side as shown at Fig. 2, and are coupled
together by means of the knife edges, i, and frame ), (see Fig. 3). The leverage
of these beams is, in the machine under consideration, (which has a weighing
capacity of 30 tons) as 1 to 25, but this leverage will of course be varied to suit
machines of different weighing capacities.
The load placed on the platform acts, by means of the suspension rod L, upon
the knife edge g of the beam B, and its pull is transmitted to the beam A through
the coupling at j. Both beams carry the bar-like sliding weights which are
capable of adjustment in grooves formed in guide blocks A, B, which are firmly
secured to the beams, and lie as close as possible to each other.
During a weighing operation the load acting upon the beam B, causes it to swing
about the knife edge in one direction and its end B2 to be depressed, while the
beam A, which is acted upon by the beam B, through the coupling at j, is caused to
swing about the knife-edge e in the same direction, so that its end A² is likewise
depressed. One or more of the sliding weights a, b, c, c, y, z, are then drawn out
by their handles a¹, b, c¹, a³, y, z, to such an extent as to bring the two beams
into a state of equilibrium, thereby causing the figures on the sliding weights to
occupy the same plane, and those figures representing the result of the weighing
are brought into line at 1, 1, immediately below a registering device carried by the
cover or casing of the machine. This registering device is not shown in the
drawings as it is of ordinary and well known construction and consists of a plate or
platten which is operated by a lever and thereby caused to press a card, or the like,
upon the figures on the sliding weights so as to obtain an impression thereof. In
order to firmly retain the beams in their position of equilibrium while this impression
is being taken, a quarter turn is given to the handle n', thereby causing the
projections n³, carried by the axis n, upon which the handle n' is mounted, to engage
with recesses n³ formed in the guide-block carriers n* (see Fig. 3B).
On reference to Fig. 2 it will be seen that the sliding weights are furnished with
two sets of figures, one set in which the figures are reversed and from which the
impressions are taken, and the other set in which the figures are not reversed and
from which the result of the weighing can be readily perceived by the attendant.
The weighing capacities of the sliding weights are, in the machine above described,
arranged as follows:-

page_text: second beam, the sliding weights of each series being in the same plane and
furnished with projecting figures or numerals from which an impression may be
obtained by a registering device, the whole being arranged in such a manner that
one series of such sliding weights corresponds to the load on the main beam, while
the other corresponds to the leverage of the second beam relatively to the first for
the purpose of reducing the weight of the second series as needed, substantially as
described.