IN SCALES FOR WEIGHING."
Year: 1881

page_text: PROVISIONAL SPECIFICATION left by the said Dr. Oscar Gerike at the
Office of the Commissioners of Patents on the 9th May 1881.
DOCTOR OSCAR GERIKE, of Berlin, in the German Empire.
IN SCALES FOR WEIGHING."
"IMPROVEMENTS
Scales made according to this Invention are applicable for domestic and business
purposes; by their general arrangement and construction they offer the facilities of
the table spring scales, but being constructed with levers with constant weight they
have not the defects of the spring scales.
The scoop is carried by a frame which works vertically between friction rollers;
these latter work in "centres" between brackets on the inside of the case so as to
minimize the friction. A descending tongue from the top member of the frame
rests with its rounded bottom part on a block fastened in the loop of a flexible
metal band (or chain or the like) passing off over a curved or circular upper part
of a crook shaped lever on each side, and united thereto by pins and eyes.
The levers are under their aforesaid upper curved part supported with knife
odges or points in bearings, and carry on their descending inward bent ends each a
constant weight.
The frame carrying the scoop has a rack gearing with a pinion fitted with a
hand, which on a dial outside the case indicates the weight weighed.
In order not to give the scales too large dimensions the lower arms of the levers
should not be too long, but on the other hand as it is desirable to weigh up to at
least 20 lbs. this would involve a combination of short lever arms with heavy.
weights, and for small weights weighed, say, of 2 to 5 lbs., cause a very small
movement of the hand on the dial. In order then to cause the weight levers and
the hand to move through a tolerably large angle even when weighing such small
weights, there is arranged another pair of levers with small weights.
In order now to apply one or other pair of weight levers, as required, under the
scoop carrying frame, the bearings for the weight lovers are arranged on slides
.

page_text: which can glide along on rails and be shifted by eccentrics or cams acting in
straps. The eccentric spindle has its bearings in the case, and is worked by a
crank handle.
The bearings for the frame carrying the scoop do not stand at the same level as
the frame rests in one or the other, according as the light or heavy weight levers
are used. To enable the bearings to be pushed easily underneath the tongue of
the frame the tongue is rounded off, or it may be done by a roller or ball.
The weight of the frame and the scoop may be counterbalanced, and thus the
two bearings made of the same height; to limit the upward motion of the bearings
the slide has stops with notches for the upper edges of the bearings to rest in.
The scoop has pegs passing down through the top of the case, and when the
scoop is loaded they pass through holes in the slide and the rails, and thus prevent
the fevers from shifting in position when the scoop is loaded.
The divisions on the dial are indicated in different colours for the different lever
pairs, and the hands are similarly distinguished. More than two pairs of levers
may of course be used, and they may be shifted by pushing pieces without using
eccentrics.
The crank handle (or the pushing pieces) may have pawl appliances to keep the
lever pairs in the required position.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Dr. Oscar Gerike in the Great Seal Patent Office on the
9th November 1881.
DOCTOR OSCAR GERIKE, of Berlin, in the' German Empire. "IMPROVEMENTS
IN SCALES FOR WEIGHING."
Scales mades according to this Invention are applicable for domestic and
business purposes; by their general arrangement and construction they offer the
facilities of the table spring scales, but being constructed with lovers with constant
weight they have not the defects of the spring scales.
And in order that this Invention may be more fully understood, I will now
describe the saine with reference to the accompanying Drawings, of which Sheet 1,
Figure 1, is a plan of such an apparatus with the two parted cover removed;
Figure 2, a longitudinal section through x, x¹; Figure 4, a vertical cross section on
line y, y; Figures 5, a cross section on line 2, 21; and Figure 6, a front
elevation.
The Figures 7 to 12 of Sheet 2 show such scales with certain parts modified,
Figure 7 is a plan of such an apparatus with levers removed on the right side;
Figure 8, a longitudinal section on the line x, x¹; Figure 9 represents a vertical
cross section on the line y, y¹; Fig. 10 is a vertical cross section on the line
the frame carrying the scoop removed; Fig. 11 is an isometrical projection of
the framework carrying the scoop; Fig. 12 is a front elevation. I will now first
describe the apparatus shewn on Sheet 1.
2,
The scoop b is carried by a flat frame a which works vertically between friction
rollers c; these latter work in centres between brackets c¹ on the inside of the case,
so as to minimise the friction. A descending tongue part a' from the top member
of the frame a rests with its rounded bottom part on a block e fastened in the.
loop of a flexible metal band f (or chains or the like) passing off over a curved
or circular upper part of a crook shaped lever G; G', on each side, and united
thereto by pins and eyes, or by screws.
The levers G, G', are under their aforesaid upper curved part supported with
knife edges or points h in bearings i, and carry on their descending bent ends each
a constant weight P, P¹.
In the example shown in the Drawing it is supposed that the two acting levers,
that is to say, the radius of the circular part of the lever and the distance from the
fulcrum of the levers to the centre of gravity of the weights are proportioned as 1.5;
so that by using two weights P, P¹, of each 2 pounds weight such an apparatus
may weigh up to 20 pounds.
The frame a carrying the scoop has a rack k gearing with a pinion / fitted with
a hand, which on a dial outside the case indicates the weight weighed. In the
Drawing it is supposed that the radius of the pinion is equal to one fourth of the
radius of the circular parts of the levers G, G', and consequently the pinion with
the index hand thereon makes a complete turn when the levers move 90°.
In order not to give the scales too large dimensions the lever arms of the
levers G, G', should not be too long, but on the other hand, as it is desirable to
weigh up to at least 20 lbs., this would involve a combination of short lever arms
with heavy weights, and for small weights weighed, say, of 2 to 5 lbs., cause a
very small movement of the hand on the dial. In order then to cause the weighed
levers and the hand to move through a tolerably large angle, even when weighing
such small weights, there is arranged another pair of levers g, g¹, with small
weights p, p', that is, in this example, say, 1 pound each, so that by the above
named proportions of levers up to 3 pounds may be weighed thereon.

page_text: In order now to apply one or other pair of weight levers as required under the
scoop carrying frame a the bearings for the weight levers are arranged on
slides m, which can glide along on rails n and be shifted by eccentrics or cams r
acting in the straps o. The eccentric spindle q has its bearing in the case and is
worked by a crank handle s.
The bearings e for the frame a carrying the scoop do not stand at the same
level, as the frame a rests in one or the other according as the light or the heavy
weight levers are used. To enable the bearings to be pushed easily underneath the
tongue a¹ of the frame the tongue is rounded off, as shewn, or it may be done by
a roller or ball.
b
The weight of the frame a and the scoop 6 may be counterbalanced, and thus
the two bearings made of the same height; to limit the upward motion of the
bearings the slide m has stops t with notches for the upper edges of the bearings to
rest in.
'
The scoop has pegs u, u, passing down through the top of the case, and when the
scoop is loaded they pass through holes u, u, in the slide m and the rails n,
and thus prevent the levers from shifting in position when the scoop is loaded.
In order to avoid strong objectionable oscillations of the lever couple in
transport, pegs are put through suitable holes in the sides of the box and in the
weights.
The divisions on the dial are indicated in different colours for the different lever
pairs and the bands are similarly distinguished.
On Sheet 2 the Figures represent these scales with different modifications.
In order to get symmetrical divisions on the dial the upper part of the
levers g, g', and G, G', on which the metal bands. are fastened is not circular,
but formed after a certain curve, the radii of which are proportioned to the
sines of the angles of deviation of the levers, as the constant weight of the
latter is proportioned to the weights to be weighed by the angles of deviation.
The levers with the constant weight p, p, and P, P', move each with two
points in steps of the slide m. The latter glides on the rails and is worked
by the handles in order to apply one or other pair of weight levers under the scoop
carrying frame a.
On the slide m the stops t are fastened, which embrace the rails n' in order to
prevent the lateral dislocation of the slide. The pieces of the stops t give
direction to the projecting ends e¹ of the bearings e in their upward motion and
the horizontal edges t2 limit this motion.. The edges t may be furnished with
india rubber in order to reduce objectionable shakes.
The scoop carrying frame a is not formed as a flat frame, as first described, but
it is a complete frame-work, as Fig. 11 represents it. In order to be carried
easily and safely the eight edges of the frame work are furnished with small
rollers c, which are exactly adjusted to the four corners of the frame d of the scales
(Fig. 7, 9).
The rack and the pinion are arranged at the middle of the scoop carrying.
frame-work, in consequence of which the tongue a¹ fastened on the rail a² of the
frame work is pierced, and the axle of the pinion 7 passes through the tongue.
The rack k is joined on the rail a² and is kept from the pinion at a. suitable
distance by the spiral spring 2.
By this almost elastic mode of fixing a soft gearing of the rack k with the
pinion is ensured.
The tin case d² encloses the whole mechanism and is fitted with the dial.
More than two pairs of levers may be shifted by pushing pieces without using
eccentrics.
The crank handle or the pushing pieces may have part appliances to keep the
lever pairs in the required position.
I claim,
First. In scales for weighing one or more pairs of levers G, G', and g, g',
provided with.constant weights and arranged substantially as described.

page_text: Second. In scales for weighing the flexible metal bands f, or equivalent
appliances, such as chains, which are fastened to the levers claimed in the first
claim, unite the said levers in pairs, and in the middle carry brasses or bearings e
for the reception of the scoop carriers, substantially as described.
Third. In scales for weighing, the slides m on which the brasses or bearings i
for the knife edges h of the levers claimed in the first claim are fastened, the said
slides being capable of sliding by means of excentrics or other pushing appliances
for the purpose of pushing the pairs of levers under the scoop carrying frame a,
substantially as described.
Fourth. In scales for weighing, the frame a sliding between roll guides serving
as a scoop carrier and which may be balanced by counterweights, substantially as
described.
Fifth. In lever scales for weighing, fitting the scoop carrier with a tooth rack
which gears into a pinion having a hand moving on a circular index, substantially
as described.
In witness whereof, I, the said Doctor Oscar Gerike, have hereunto set
my hand and seal, this Third day of November, in the year of our Lord
One thousand eight hundred and eighty one.
DR. OSCAR GERIKE. (L.S.)