Improvements in Weighing Machines.
Year: 1896

page_text: Date of Application, 4th Jan., 1896-Accepted, 15th Aug., 1896
COMPLETE SPECIFICATION.
Improvements in Weighing Machines.
We, KARL SCHUTTE and WILHELM POPPE, Manufacturers, of Hanover,
Germany, 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:-
In all the existing descriptions of pendulum weighing machines the edges which
carry the balauce lever or beam and the scales are fastened to the lever or to the
arm of the same. As a result of this construction, the edges have to be put in
exactly the right position in relation to themselves and to the weighing scales, an
operation which hitherto has always been extremely difficult, the edges not being
made out of a single piece. In fact, this adjustment has seldom been perfectly
exact, although the accuracy of the weighing machine rests solely on the accurate
position of the edges, as even the least deviation from the right position of these
edges causes the weighing to be more or less inaccurate.
The object of the present invention is to produce a pendulum weighing machine,
whereby the smallest weight, even that of a gramme, may be ascertained. For
this purpose, an auxiliary scale is employed. Both scales, the weighing scale and
the auxiliary scale, work with equal accuracy, because both are actuated by the
same mechanism, and because the indicating mechanism of the main scale is the
same as that of the auxiliary scale.
The characteristic feature of this new pendulum weighing machine is the main
axle which is suitably bent and provided with knife edges. Instead of the usual
four edges, this new weighing machine has only one single piece out of which are
cut, by means of a cutting machine, edges which agree mathematically.
By using the new main axle, the disadvantages hereinbefore mentioned are
obviated.
In the accompanying drawings,
Figs. 1 and 2 show a pendulum weighing machine actuated by means of a
weight.
Fig. 3 shows the main axle with its edges.
Figs. 4 and 5 show a weighing machine actuated by a spring.
Fig. 5 shows the axle of the machine Figs. 4 and 5.
Fig. 6 shows a front view of this weighing machine with the index.
In Figs. 1, 2 and 3 the main axle A with its edges a' a² is shown, the edges a¹
resting in the frame G of the machine and the other edges a carrying the table b
with the scale B. Fastened to the main axle is the forked balance lever C. In
Figs. 1 aud 2 this is represented with a weight x. This weight, however, may be
replaced by springs C as shown at Figs. 4 and 5. These springs C are fastened
to the lever beneath the piece D by means of a pin C3. They are also connected
to the bar T of the frame.
By using a spring for actuating this weighing machine, the same becomes
extremely sensitive, indicating a weight as small as a gramme.
At the point where the branches of the lever C meet, is an arm D (Figs. 2
and 5) carrying a rack d, Figs. 1 and 4. That part D of the arm D, which is
fastened to the lever C, is shaped or bent (see Figs. 1 and 3) so as to catch the lever E
carrying the auxiliary scale L. The aforesaid rack d gears with the toothed
wheel d fastened to the axle d' whereon the pointer of the index is likewise
fastened, thus producing a motion of the pointer corresponding with the weight to
be weighed.

page_text: The scale and the pointer are protected by a pane of glass
frame (Fig. 2) whose rearwardly projecting catches
recesses in the ring and bent over as shown at Fig. 1.
The counter weight is fitted directly to the lever C.
preventing the lever C turning over.
secured in a metallic
are passed through
The guide bar F is for
The table with the main scale B is guided in the usual manner by means of
the guide rod I fastened to the table, the connecting part t and the hinge H.
It should also be mentioned that the balance lever C is provided with a hocke',
and the guide rod F with a projection with which the look el engages. When
the parts are in the position shown in Fig. 1 the parts C, F, are fixed and
the whole mechanism of the weighing machine is locked. The mechanism can be
released by pressing the huck e upwards and free of the projection
After the hook, is freed from the projection f and after a weight has been
placed in the scale L suspended from the lever E, the weight with its scale goes
down and the wheel d' is set in motion by the arm D connected with the rack d.
This motion is transferred to the pointer by means of the axle d thereby showing
very accurately on the graduated scale the amount of the weight placed in the
scale L. In case a heavy object is to be weighed and no great exactness is
required, the weight is simply laid on the scale B when the same goes down and
transfers the movement, likewise by way of the lever mechanism, to the before
mentioned pointer, the lever C moving in the direction of the arrow. The lever F
is free to turn round H and is rigidly connected to the table carrying the
scale B.
The table is seated on the edges a, a, and because a, a, and a', a are not
placed in the same horizontal plane, the whole axle A is turned, which turning
movement is transferred to the pointer through the lever C, rack d and wheel d¹.
The scale is forced back into its normal position by means of the lever acted upon
by the weight (see Fig. 1) or the springs C (see Fig. 4). But for this purpose
the weight and the springs must be exactly adjusted. The scale whereon the
pointer moves has two different divisions, the one indicating small weights for the
auxiliary scale, the other for heavy weights weighed in the big scale B.
By means of the screws, at the bottom of the front part of the frame, the
index pointer can be placed at 0 even when the scales are in an inclined
position.
This arrangement dispenses with the use of movable weights and greatly
simplifies the construction of the apparatus.
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 consider novel and desire to claim is :-
1. A pendulum weighing machine actuated by a weight or by a spring and
characterised by a single axle suitably bent, provided with knife edges a¹, u², a², u²,
and carrying the table 6 with scales B and the lever C, the maiu axle A with
a rack-bolder D serving as a bearing for the piece E, the latter supporting an
auxiliary scale substantially as hereinbefore described with reference to the
drawings annexed.
2. In a pendulum weighing machine actuated by a weight or by a spring as
described in Claim 1, a coupling mechanism for the balance lever C and guiding
rod F characterised by a book e fastened to the balance lever C or the guiding
rod F, this hook being arranged to engage with a projection or ring, the
weighing machine being thus arrested in its action, substantially as herein before
described with reference to the drawings annexed.
Dated this 3rd day of January 1896.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.