IMPROVEMENTS IN WEIGHING SCALES
Year: 1884

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Win. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN WEIGHING SCALES a communication to me from abroad by Henry Clay Keeler,
of Ogden, Utah Territory, United States of America, to be as follows:-
"
This Invention relates to improved weighing scales constructed as hereinafter
described.
The beam is pivoted to a supporting bracket, in the lower portion of a suitable
enclosing case for the scale mechanism and for a base to the scoop which is mounted
on the top of a vertical bar extending down through the top of the case to the
scale beam, whereon it is pivoted and from which it extends below the beam a
short distance, to support a pin, for the connection of a hook by which to connect
the lever of a platform scale. From the pivot the beam has an extension of n
suitable length the end of which is connected by a rod with the end of a horizontal
arm, of a pendulum weight, which is suspended from a pivot suitably for weighing
the smaller quantities for which the scoop is used by swinging around said pivot.
Between the fulcrum and the end of the beam to which the said pendulum weight
is connected said beam is connected by a rod with the arm of a shaft that carries
a couple of pointers which range along a couple of dials that face in opposite
directions in order that the weight may be read off from either side. of the scale
through glass panels in the sides of the case. A multiplying weight is suspended
from the beam for use when heavier weights are to be weighed in the scoop, or on
a platform and a balancing ball is fixed on the end of the scale beam for shifting
along it as may be required for adjusting from time to time as the temperature
changes, said ball being fixed to screw along the beam. This ball and the weight
are to balance the beam when said weight stands in the zero notch.
The pendulum weight hangs directly downward when the index is at zero of the
scale. The downward movement of the arm of the beam is limited by the rod
connecting it to the arm of the pendulum weight and by this movement the weight

page_text: is swung through an arc of about 60° and a pointer if attached to the axis thereof
would indicate the same angle of motion. I find that such registry is not accurate
but indicates sometimes more and sometimes less than the actual weight according
to the relative positions of the arms and I therefore provide an independently
journaled index arm as described. This arm is so connected to the beam that it
moves through a different angle from the pendulum weight and the relation of its
crank to the line of its connecting rod is at all times different from the relation of
the crank or arm of the pendulum weight to the connecting rod.
I may if preferred substitute pendulums with removable weights for the weights
above described in case a very wide range of variations is required between the
scoop weights and the platform weights and when a platform is connected with the
scalo I may use a double beam and double weights.
For a platform scale only, the scoop supporting bar, will not be used, nor
extended above the weigh beam and when both the scoop and platform are used
together with a double beam as commonly used with a scoop and platform scale
there must be another dial in connection with this pointer device, for the platform.
In this arrangement one of the beams and dials will be graduated for the scoop and
the other beam and dial for the platform.

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN WEIGHING SCALES" (a communication to me from abroad by Henry Clay Keeler
of Ogden, Utah Territory, United States of America) and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement :—
This invention consists in the construction and combination of parts forming
weighing scales, hereinafter fully described and claimed.
Reference is to be had to the accompanying drawings forming part of this
Specification in which similar letters of reference indicato corresponding parts in
all the figures.
Figure 1 is a sectional elevation of the enclosing case for the scale mechanism
and supporting base for the scoop showing the mechanism in side elevation.
Figure 2 is a transverse section of the said scale on the line x x of Figure 1.
Figure 3 is a detail in perspective view showing a double beam, to be used when
both the scoop and platform are employed in one scale. Figure 4 is a sectional
elevation of the scale as arranged with a platform without the scoop.
The beam a is pivoted to a support-bracket at b, in the lower portion of a suitable
enclosing case c for the scale mechanism and for a base to the scoop & which is
mounted on the top of a vertical bar e extending down through the top f of the
case to the scale beam a whereon it is pivoted at g, and from which it extends
below the beam a short distance, to support a pin at h, for the connection of a hook
by which to connect the lever of a platform scale. From the pivot g the beam a,
has an extension of a suitable length the end of which is connected by a rod i with
the end of a horizontal arm j'of a pendulum weight k which is suspended from the
pivot l, suitably for weighing the smaller quantities for which the scoop is used by
swinging around said pivot as indicated by the dotted lines m.
Between fulcrum b, and the end of the beam to which the said pendulum
weight is connected, said beam is connected by rod n, with the arm o of a
shaft p, that carries a couple of pointers q which range along a couple of dials 8 that
face in opposite directions, in order that the weight may be read off from either
side of the scale through glass panels t in the sides of the case. A multiplying
weight is suspended from the beam a suitably for use when heavier weights are
to be weighed in the scoop, or on a platform to be connected with the bar e, and a
balancing ball is suitably fixed on the end of the scale beam for shifting along it
as may be required for adjusting from time to time as the temperature changes,
said ball being fixed to screw along the beam. This ball and the weight u are to
balance the beam when said weight u, stands in the zero notch.
The weight hangs directly downward when the index q is at o of the scale.
The downward movement of arm a of the beam is limited by rod i when it almost
coincides with a radius through 1,j. By this movement the weight & is swung
through an are of about 60°, and a pointer if attached to the axis thereof would
indicate the same angle of motion. I find that such registry is not accurate but
indicates sometimes more and sometimes less than the actual weight, according to
the relative positions of arms a and j. I therefore provide an independently
journaled index arm q, as described. This arm is so connected to the beam a that
it moves through a different angle from the weight and the relation of its crank o

page_text: to the line of its connecting rod is at all times different from the relation of crank
or arm to connecting rod i. I may if preferred substitute pendulums with
removable weights for the balancing ball and the weights u, in case a very wide
range of variations is required between the scoop weights and the platform weights,
and when a platform is connected with the scale, I may use a double beam a, and
double weights u.
In practice I will have the usual knife edge pivots in all cases except the
pivots of the pointer shaft p; which must have close fitting bearings and caps for
accuracy.
For a platform scale only, the scoop supporting bar e will not be used, nor
extended above the weigh beam and when both the scoop and platform are used
together with a double beam, as commonly used with scoop and platform scale
(see figure 3) there must be another dial s¹ in connection with this pointer device
for the platform. In this arrangement one of the beams and dials will be graduated
for the scoop and the other beam and dial for the platform.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is :-
1. The weigh beam a, journaled in the main frame, the weight k journaled in the
frame at 1, and provided with arm j and the rod i, connecting arms a and j in
combination with the index or pointer q, independently journaled in the frame and
provided with the crank arm o and the rod n; connecting arm o with arin a, as and
for the purpose specified.
2. The combination in a weighing scale of the weigh beam a, having the
multiplying weight u, balance weight v, and-pendulum weight k, and the sup-
porting bar e, having the scoop d, and the platform lever connecting extension h
substantially as described.
3rd In a weighing scale having the pointer q connected with the weigh beam
for recording the weights on a dial, the said dial having separate dial scales for
the scoop, and platform, in combination with a double weigh beam substantially as
described.
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