Improvements in Weighing Machines.
Year: 1890

page_text: Date of Application, 3r1 May, 1890
Complete Specification Left, 16th Jan.. 1891-Accepted, 21st Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in Weighing Machines.
We, THOMAS JAMES POUPARD, of 134, Tooley Street, Southwark, Surrey,
Weighing Machine Maker, and THOMAS LEWIS, of Kettering, Northamptonshire,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to what are known as "bob-up" weighing machines, and
the invention consists in a novel arrangement of the parts, whereby great accuracy
in weighing is obtained.
In bob-up machines as at present constructed, it is found that unless the material
being weigher is placed in the centre of the platform, a false weight is given,
consequently the authorities refuse to stamp bob-up machines as correct weighing
machines.
In carrying out our invention, we make use of the double lever principle, and
instead of supporting the platform by legs direct on the knife edges near the
fulera of the levers, we provide the platform with sockets which fit onto legs
forming part of a suspension bar carried by links or hooks from the knife edges.
The suspension har does not extend beyond the total width of the lever.
bent at right angles at the ends, and then upwards to form the legs, which enter
the sockets, the said legs being curved so that the points which enter the sockets
will be exactly over the knife edges or centres.
It is
Instead of fomning the legs in one piece with the bar, we may make them forked
to straddle the knife edges and links, and connect the forks to the suspension bar
by bolts and nuts or other suitable fastenings.
By these means we obtain a weighing base equal to the size of the platform, on
any portion of which the accurate weight may be obtained.
Dated this 3rd day of May 1890.
NEWTON & SON,
Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Weighing Machines.
We, THOMAS JAMES POUPARD, of 134, Tooley Street, Southwark, Surrey,
Weighing Machine Maker, and THOMAS LEWIS, of Kettering, Northamptonshire,
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 :-
This invention relates to what are known as bob-up weighing machines, and the
invention consists in a novel arrangement of the parts, whereby a large weighing
base is provided for, without increasing the size of the machine, and accurate
weighing may be obtained at any point on the platform.
In bob-up machines as at present constructed, it is found that unless the material
being weighed is placed in the centre of the platform, a false weight is given.
In carrying out our invention, we make the platform and case square, and we
provide at or near the corners of the case, seats for the knife edges of the
base ends of two triangular weighing levers. These levers are arranged so that
the apexes cross one another, and are connected to a weight bar by links in a
manner well understood. Instead of supporting the platform by legs direct on
the knife edges near the fulcra of the levers, we provide on the underside of
the platform, sockets which fit onto legs forming part of suspension bars carried

page_text: by links or hooks from knife edges on the levers. In this way, we obtain the
flexibility of platform necessary in this kind of inachine.
The suspension bars are, at the ends, bent round the links, and then upwards
to form the legs, which pass through slots in the levers and enter the sockets,
the said legs being curved so that the points which enter the sockets will be
exactly over the knife edges or centres.
Instead of forming the legs in one piece with the bar, we may make them
forked to straddle the knife edges and links, and connect the forks to the
suspension bar by bolts and nuts or other suitable fastenings.
By these means we obtain a weighing base equal to the size of the platform,
on any portion of which the accurate weight may be obtained.
In the accompanying drawing,
Fig. 1 is a plan view, partly in section, of a bob-up weighing machine constructed
according to our invention, with the platform removed.
Fig. 2 is a side elevation, partly in section; and
Fig. 3 is a detached view of one end of a suspension bar arranged according
to our invention.
A is the case enclosing the weighing mechanism, consisting of a pair of
triangular shaped levers X X', and having their fulera on seats X³, formed at
or near the corners of the case A.
('(' are
B is the platform, provided on its underside with sockets B.
suspension bars carried by links D from knife edges on the levers X X of the
weighing mechanism. The ends of these bars are bent at right angles, and
again at right angles, parallel with the bar, in order to get round the links D. The
bars are next bent upwards and curved outwards to form legs ("¹ to enter the
sockets B' of the platform, which will be exactly over the knife edges that support
the links D. The legs are passed up through slots in the ends of the levers X'X'
These suspension bars do not extend beyond the extreme width of the weighing
levers, so that no space is required between the ends of the levers and the case.
By this arrangement of apparatus, we obtain a weighing lase of nearly the
same extent as the platform, and this without increasing the external dimensions of
an ordinary bob-up machine.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the sanic is to be performed, we declare that what we
claim is :-
1. In weighing machines having square platforms, supporting the platform at or
near its corners on legs formed in one with or attached to suspension bars carried
by links from the weighing levers, and projecting through slots in the ends of said
lovers, all as herein shown and described, and for the purpose set forth.
2. Providing the platforms of weighing machines with sockets to fit onto legs
formed in one with or attached to suspension bars carried by links from the
weighing levers, as herein shewn and described.
3. A weighing machine constructed and arranged as herein shown and described,
for the purpose set forth.
Dated this 16th day of January 1891.
NEWTON & SON,
Agents for the Applicants.