Year: 1886

page_text: We FLORIAN TENTSCHERT and FRIEDRICH WILHELM MINCK both of Vienna in
the Empire of Austria do hereby declare the nature of this invention to be as
follows:-
This Invention relates to a new balance or weighing machine in which a weight
provided with a pointer is traversed along the beam by means of a screw to
indicate divisions of weight. At one end of this screw is fixed a disc or drum
provided with a scale indicating subdivisions of weight. End play of the screw is
prevented by dividing its bearings and providing them with inclines which serve as
slides for taking up by the weight of the parts any wear which occurs.
The
threads of the screw and those in connection with the sliding weight with which
the screw engages, may be wedge shaped so that a half screw nut may be used
engaging the lower or upper half of the screw according to the inclination of the
incline of the thread or the nuts may be mounted in inclined guides in the weight
so that the weight adjusts the nuts nearer to each other and by these means wear
in the screws is compensated for.
J. HENRY JOHNSON,
Agent for the said Florian Tentschert and
F. W. Minck,

page_text: improvements in Balances or weigning machines.
We FLORIAN TENTSCHERT of 1 Plosselgasse Vienna Civil Engineer and
FRIEDRICH WILHELM MINCK of 4 Pestalozzigasse Vienna Merchant both in the
Empire of Austria 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 a new balance or weighing machine in which a sliding
weight is traversed along the weighing beam by means of a screw-At one end of
this screw is fixed a disc or drum provided with a scale shewing the subdivisions
of the weights End play of the screw is avoided by the arrangements hereinafter
described.
In order that the Invention may be fully understood the same is described more
particularly with reference to the accompanying drawings in which the same letters
indicate corresponding parts.
Figure 1 represents partly in vertical section taken through the axis and partly
in elevation a balance or weighing machine constructed according to this Invention.
Figure 2 is a plan of the same partly in section the scale pan being removed.
Figures 3 and 4 represent modifications in the screw threads and in the nuts
appertaining thereto.
Figure 5 is a cross section through the sliding weight, the screw, and index of
the arrangement in Figure 1.
Figure 6 represents a front view of the beam looking in the direction of the
arrow I, the drum at the end of the screw being removed.
Figure 7 shows in a front view the scale pan holder with its knife-edges.
Figure 8 represents in a side view details of the arrangement of the knife-edges
of the scale holder and of the framing beam of the, balance.
Figure 9 shows the adaptation of the Invention for decimal and centesimal
balances.
The balance constructed according to this invention consists essentially of a
frame shaped beam W having a scale fixed on the connecting bow W¹. Within
this beam is lodged the screws which by turning displaces the sliding weight G in
order to balance the weight of the article or matter placed in the scale pan A.
The bearings of the screws are vertically divided and provided outside on both
sides with inclined planes k, which serve as slides for the purpose of equalizing the
wear and tear on the collars v of the screw 8 and on the face of the bearings so
that a gradual sinking of the weight G and of the screw 8 and of the bearings is
produced by the weight of these parts as wear takes place and thus any end play
of the screws is avoided. The thread or threads of the screw 8 is or are tapered
either from the circumference towards the spindle (as shewn in the sectioned part
in Figure 1) or vice versa (as shown in Figure 3) or they are flat or square threads
as shewn in Figure 4.
In the first case the nuts m m are semi-circular ones and support the sliding
weight G by means of the bolts 6 and are situated at the lower half of the screw
spindle. In the second case (represented by Figure 3) they are situated at the

page_text: upper half. In the third case (represented by Figure 4) the nuts m are provided
with inclined guide blocks c (see the detail in Figure 4) which slide in corre-
spondingly inclined grooves in the sliding weight Ġ so that the pressure due to
the weight G tends to press the nuts m towards each other and press them closely
against the threads of the screw s as the weight sinks down in proportion to, and
to compensate for the wear and tear of the nuts and threads.
It is obvious that in none of the three before stated cases any end play of the
screw 8 can take place and therefore a regular working of the balance is secured.
The weight G is connected with the pointer or index finger Z by means of the
screw pins d (see details in Figure 5) and carries the latter with it when it is
traversed.
The lateral surfaces of the bow W₁ converge downwards and avoid any lifting
of the sliding weight G from the screws in consequence of the connection with the
index finger Z.
To one end of the screw & (Figures 1 and 2) is fixed a drum t' with a hand
wheel or a crank K and the drum t¹ has on its surface a scale showing the
subdivisions of weight, whilst at the scale on the bow W₁ only, the multiples and
larger divisions of weight are indicated by the index finger Z. The pitch of the
screw as well as the division of the scales and must be calculated and marked
according to the size and purpose of the balance or weighing machine. Say for
example that the machine is to be used for weighing up to 10 kilogrammes. The
pitch of the screw is such that at each revolution of the screw the sliding weight G
is displaced 2 centimetres to the right, that is to say the index finger Z advances
from zero to the division 1. This displacement for 2 centimetres to the right of
the sliding weight G corresponds to a charge of 1 kilogramme in the scale pan A.
In the position represented by Figures 1 and 2 the balance is in the state of
equilibrium, the weight of the sliding weight G together with that of the index
finger Z represents 3 kilogrammes.
In the example shewn distance of the centre of gravity of the sliding weight G
and index finger
from the axis of oscillation of the beam W is 4 centimetres
whilst the distance of the centre of gravity of the scale pan holder t from the same
axis of oscillation is 6 centimetres.
Therefore when charging the scale pan A with one kilogramme on the arm of
the lever having a length of 6 centimetres the arm of the lever at the left of the
axis of oscillation will be balanced by sliding the weight G and index finger Z for
2 centimetres towards the right. We obtain such displacement of 2 centimetres
by turning the drum t' and the screw & a whole revolution which as before
mentioned corresponds to a displacement of the index finger Z from zero to the
division 1 of the scale l.
The tongues n n are fixed to the beam W and the counter tongues o o are
placed on the support of the balance, the play of which may be easily observed by
both the purchaser and the seller to indicate a proper balancing.
The holder t of the scale pan is at its lower part connected with the support of
the balance by means of a guide p which secures the vertical position and move-
ment of the pan holder.
u is a weight for compensation maintained in its position by and adjustable
upon a screw.
The balance rests upon 3 points consisting of the feet p¹ and the set screw o
which in combination with the pendulum f see Figure 8 serve to adjust the
balance to a truly horizontal position. By the bolts r (see Figure 7) any removal
of the oscillating parts from each other and from the support of the balance is
avoided.
.
The supporting jaws h of the knife edges of t and w are provided with lateral
knife edges on both ends against which stand the vertical surfaces of the tappets i
attached to the beam W and to the scale pan holder t. By these means any
lateral displacement of the beam W and the holder t in the direction of the knife
edges is obviated. The construction represented by Figure 9 shows the adaptation

page_text: of the Invention for decimal and centesimal balances and is in principle identical
with the herein before described balance so that its construction can fully be under-
stood by an inspection of the drawing with reference to the preceding description
the corresponding parts being marked with the same letters of reference.
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
1st In balances or weighing machines a screw operating a weight and arranged
and operating substantially as hereinbefore described.
2nd In balances or weighing machines a screw operating a weight and indicator
in combination with a disc or drum or its equivalent for indicating subdivisions of
weight constructed and operating substantially as hereinbefore described.
3rd In balances or weighing machines operated by a screw, the means for
preventing end play of the said screw substantially as hereinbefore described
and illustrated.
4th A balance or weighing apparatus wherein the balancing of the article or
matter to be weighed is obtained by the displacement of the sliding weight and
index finger connected therewith, operated by a screw carried by the beam and
provided with a graduated disc or drum and wherein end play of the screw is
obviated substantially as hereinbefore described.
5th In apparatus of the kind described the arrangement of the scale at the
surface on the disc or drum t¹ for indicating subdivisions of the weight sub-
stantially as hereinbefore described and illustrated,