Improvements in Platform Weighing Machines.
Year: 1898

page_text: Date of Application, 20th Dec., 1898-Accepted, 11th Feb., 1899
COMPLETE SPECIFICATION.
Improvements in Platform Weighing Machines.
We, JOHAN AUGUST STÄCKIG, Engineer, and OTTO CARLSON, Merchant, both of
42, Luntmakaregatan, Stockholm, in the Kingdom of Sweden, 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 improvements in platform weighing machines and is
chiefly designed to provide a simple and at the same time very stable suspension
for, such weighing apparatus as also an easy method of suspending and releasing
the platform, the parts forming the said mechanism being at the same time well
protected.
A form of the invention is shewn in the accompanying drawing in which
Figures 1 and 2 are vertical sections at right angles to one another of the
apparatus; and,
Figure 3 is a plan of the arrangement of levers, the platform being supposed
removed.
The platform is provided on its underside with four downwardly extending
arms 2 by means of which it rests upon the knife-edges 10 and 11. These arms 2
are arranged in pairs of different lengths whereby the knife-edges 10 and 11 are
disposed in different planes. The knife-edges 10 are arranged near the base of a
triangular lever 12 which is carried at its base and apex by the arrangement of
levers (not shewn in the drawing) leading to the weighing apparatus proper.
In the frame there are pivoted two rotatable shafts 6 which can be turned in
both directions within limits through the medium of arms 5 secured to them and
connected together by a link 4 and of a lever 3 which is connected to the link 4
and is pivoted upon a pin fixed to the frame.
The shafts 6 are provided with eccentrics or arms 7 each of which is provided
with two carriers 8. These carriers 8 are movable in a vertical plane in suitable
guides and the arms 7 are so arranged that when the lever 3 is turned into one of
its extreme positions, they bring the carriers 8 into their uppermost position and
when the lever 3 is turned into the other extreme position the carriers are moved
to their lowermost position. Each carrier 8 is provided with hooks 9 by means
of which one carrier carries the base of the above mentioned triangular lever 12.
The hook of the other carrier supports the base of a square shaped lever 14 which
carries near its lower edge the above mentioned knife-edges 11. The opposite
side of this lever 14 is provided with pins 15 by means of which it rests in the
rings 16 carried by the pins 17 projecting from the triangular lever 12.
The operation of the above described apparatus is as follows:-In the position
of the lever 3 and of the arms 5 illustrated in Figure 3 the arms 7 have brought
the two carriers 8 into their uppermost position. The carriers support, by means
of the hooks 9, the bases of the triangular lever 12 and of the square lever 14 the
latter being supported in addition by the pins 15 and 17 of the triangular lever 12,
the apex of which is carried by the connection extending to the weighing apparatus
proper. In this uppermost position of the triangular lever 12 and of the lever 14
the knife-edges 10 and 11 which are fitted thereto carry the arms 2 which extend

page_text: downwards from the weighing platform, so that the said platform is raised and
is ready for use.
If, however, the lever 3 with the arms 5 be turned to the right from the position
indicated in Figure 2, the carriers 8, and thereby the hooks 9 and the base of the
triangular lever and of the lever 14, are moved into their lowermost positions.
The knife-edges 10 and 11 and the platform 1 with the arms 2 are also lowered,
their drop being regulated by the platform striking against a stop fixed to the
frame just before the knife-edges 10 and 11 have reached their lowermost
position. As soon as the platform 1 has reached its stop the knife-edges 10 and 11
are released from the arms 2 carried by it and are thereby protected against damage
should the platform be carelessly loaded.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
A suspension arrangement for platform weighing machines wherein the platform
is loosely carried by a frame consisting of two single-armed levers 12 and 14 one
of which (12) is triangular in shape and is carried by the connection extending
back to the weighing apparatus proper and itself carries the other lever, the said
parts 12 and 14 being carried by carriers 8 movable in a vertical plane and adapted
to be lowered to such an extent that the weighing platform comes to lie upon a
rigid support and the frame is released therefrom, substantially as described and
illustrated.
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicants.