An Improvement in Weighing Machines.
Year: 1890

page_text: Date of Application, 7th June, 1850-Accepted, 15th July, 1890
COMPLETE
SPECIFICATION.
An Improvement in Weighing Machines.
I WILLIAM JOHN POUPARD, Junior, of 11 Raul Road, Peckham in the County of
Surrey, Weighing Machine Maker 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 an improved weighing machine specially designed for
use in retailing or delivering coals in sacks and it has for its object to enable the
"tare"
or allowance to be made for the weight of the sack, to be readily ascer-
tained without the use of loose weights and of complying with the legal requirement
that the sack itself should be weighed separately from the contents.
To this end the invention consists in the combination, with a platform weighing
machine suitably arranged for the purpose, of a spring balance arranged in convenient
position for indicating the value of the load placed upon the platform, and having a dial
specially divided to enable the sack and coals to be weighed separately.
Reference is to be had to the accompanying drawings, forming part of this specifica-
tion, wherein figure 1 is a vertical section on line 1-1 figure 2; and figure 2 a
horizontal section on line 2-2 figure 1 of the improved machine. Figure 3 is an end
clevation of the machine looking towards the dial of the spring balance. The same
letters of reference indicate like parts in all the figures.
A is the platform supported by legs a upon the pairs of knife edges b b, c c,
of the steelyard levers B and C fulcrumed at b and c and connected together at
22, the general construction and operation being much as usual it being only
necessary to so arrange that the load placed on the platform shall transmit a down-
ward pull at the free end of the extension B' of the main lever B to which is connected
the spring-actuating slider or plunger of an ordinary spring-balance D suspended from
an arched frame E and whose dial is graduated up to, say, fourteen pounds (or the
maximum weight of an empty sack) at certain points of its circumference only, so as
to facilitate reading and avoid liability to deception or error. The points from which
the dial is so graduated are zero and also those corresponding to the amounts of the
several weights in which it is desired to sell or deliver the coal, namely-half hundred-
weight, one hundredweight, and two hundred weights. The balance shewn is adapted
only to weigh quantities of half and one hundredweight and it is therefore graduated
as above mentioned at those places indicated by the letters fg and h respectively.
The mode of using the machine is as follows; the index standing at zero, as shewn,
the empty sack is placed on the platform and the extent to which the index moves
over the graduations at is noted. The sack is then filled on the platform for the
purpose of being weighed with the contents, it being only necessary to continue filling
the sack until the index moves as far along the graduations g or h (according as half
hundredweight or one hundredweight is to be weighed) as it was moved from zero by
the weight of the sack alone in the first instance. Thus the "taro" of the sack is
readily allowed for without liability to mistakes inseparable from the handling of loose
weights, and in a manner which may be easily understood by the purchaser under
whose supervision the operation is to be performed.
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;
The combination, with a platform weighing machine, of a spring balance adapted to
he actuated by and to denote the load on the platform of the machine and having a

page_text: dial specially graduated from certain points corresponding respectively to zero and to
the amounts of the several weights by which it is desired to sell the goods so
as to enable the " tare " of the sack to be ascertained and allowed for, as
specified.
1000
W. J. POUPARD, JR.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.