Improvements in Lever-balances.
Year: 1891

page_text: Date of Application, 28th Nov., 1891-Accepted, 30th Jan., 1892
COMPLETE SPECIFICATION.
Improvements in Lever-balances.
We FERDINAND KOCH and CARL KOCH both of 85 Engelborsteler Damm
Hanover in the Kingdom of Prussia German Empire Manufacturers 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:
The object of our invention is to provide a balance having equal sensibility for
heavy and light weights that is to say the said improved balance is fitted with an
arrangement whereby heavy weights are made to cause comparatively small
deflections of the pointer or pointers and light weights to cause comparatively
great deflections of the same. To attain which we combined two balances one
having a scale for heavy weights and the other a scale for light weights. Both
balances acting by means of suitable levers (as hereinafter more clearly described)
upon the axis carrying the pointer or pointers the latter being provided with two
indicating scales one for heavy weights and another for light ones.
In order that our invention may be more clearly understood we will proceed to
describe a balance made according to our improvements reference being had to the
accompanying sheet of drawings, in which
Fig. 1 is a back elevation of a balance.
Fig. 2 shows the manner in which we prefer to arrange the pointer and the
indicating scales, and
Fig. 3 is a modification of our said improvements.
Like letters of reference denote corresponding parts in each view.
The scale B for (heavy weights) rests by means of suitable parts upon the
knife-edges of two double levers A, A' which said levers are carried by similar
edges a on two brackets cast with or otherwise fixed to the frame of the
balance.
The distance between the lower ends of levers A, A' is kept constant by means
of connecting rod Z.
.
To the lever A. there is rigidly attached an arm or rod upon which is
secured a piece the end of said piece being bent as shown and provided with
a notch into which fits the slot or eye of vertical rod the opposite end of said
rod his bolted or otherwise fastened to a strip of metal f.
The latter is by means of a screw secured to the disc s which rotates on the
axis b. Another disc s' is also fitted on the axis band to which is fixed an arm 1,
carrying at its end the counterpoise g'.
At a suitable point
on the arm is provided a projection or lug m through which
passes a screw 3 serving to displace the centre of gravity of arm and counter-
poise and thereby to adjust the index hand or hands so that they point to zero.
To the axis b is also firmly connected a toothed sector u which meshes with the
small toothed wheel z fixed on the axis of the pointer having two ends and /*
for the purpose hereinafter specified.
The scale B' (for light weights) rests upon two arms y which are fastened to a
cross-bar 9 connecting with one another the rods e whose upper ends are pro-
vided with holes into which enters the knife-edge fixed to a lever c, which is
secured to the axis b, so as to act upon the toothed sector u, the toothed wheel.
and thereby upon the pointer =. The rod e near its lower en is provided with
a notch, another rod i fits into said notch and rests with its opposite end against
a notch made in the rod to receive same which is fixed to the frame of the
balance.
The lever c being longer than the radius of the discs, the balance on which the

page_text: scale Brests is more sensible than that upon which the scale B acts; that is to
say if an object be placed successively on the scales B and B it will cause a
greater leflection of the pointer in the former case than in the latter the scale B¹
is therefore especially employed to weigh light objects.
It will be obvious that as the pointer moves in a different manner according as
the objects are placed on the scale B or the scale B₁ it is necessary to have two
indicating scales for the pointer the one to indicate the weight of light objects
placed on the scale B' the other to indicate that of heavier objects placed on the
scale B.
z
As shown in Fig. 2 the pointer is made double-ended for this purpose, the
shorter end pointing to the scale used for light weights, and the longer one to
that employed for heavy weights.
We prefer to employ one double-ended pointer as shown on drawing at Fig. 2;
but another pointer may be fixed to the axis and fitted with corresponding index
scales which addition in some cases may be found convenient, as one pointer would
have a more rapid motion than the other, and thus more exact indications could be
obtained.
For household use the arrangement illustrated on the drawings affords sufficient
accuracy.
The modification shown at Fig. 3 relates to the manner in which the movement
of the scale B is transmitted to the pointer or pointers.
The scale B is in this arrangement fixed to the top of a vertical rod y' which is
linked at to a bent lever z fulcrumed at 6. This lever is bent a second time
at and is connected at its end to the rod and metal strip to the lower end of
the rod y is linked a rod having its fulcrum on the frame of the balance at /^.
The remaining parts are the same as in the arrangement herein before described.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The combination of two balances of different sensibility, acting by means of
suitable parts on a pointer or pointers having two indicating scales, for the purpose
and substantially in the manner as hereinbefore described and shown on the
drawing.
2. In a lever-balance, the combination with the scale B the levers A and A',
the connecting-rod Z, the parts w and e, the rod the metal-strip fixed to the
discs on the axis b, carrying or not carrying a pointer for which there are two
indicating scales, and with the toothed sector u, the toothed wheel carrying the
double-ended pointer for which there are two indicating scales and the arm
having at its end the counterpoise g¹ provided with projection or lug m and with
screw passing through the same, of the scale B', the arms y the lever c secured
to the axis the cross-bar and the rods e, i and substantially as and for the
purpose described.
3. In a lever balance: The combination, with the scale B the rods y' and is, the
bent lever, the rod, the metal-strip ffixed to the disc s on the axis b, carrying
or not carrying a pointer for which there are two indicating scales, and with the
toothed sector u the toothed wheel a carrying the double-ended pointer for which
there are two indicating scales, and the arm having at its end the counterpoise g¹
and provided with lug m and screw g³ passing through the same of the scale B¹ the
arms y the lever c secured to the axis b the cross-bar q and the rods e i and i¹
substantially as and for the purpose described.
Dated this 18th day of November 1901
l
H. F. BOUGHTON, M.I. Mech. E.,
London, Sheffield, and Barnsley, Agent for the Applicants.
H. F. BOUGHTON, M.I. Mech. E.,
London, Sheffield, and Barnsley, Agent for the Applicants.