Year: 1888

page_text: We, JOSEPH CARTWRIGHT of 13, Myrtle Terrace, Cross Lane, Salford, fitter and
JOSEPH WILBRAHAM CARTWRIGHT of 35, Withington Street, Pendleton, Salford, in
the County of Lancaster, pattern maker, do hereby declare the nature of this inven-
tion to be as follows:-
Our invention relates to that class of weighing machines known as self-indicating
or pendulous lever weighing machines. In these a Tee shaped or double bell-crank
lever is suspended on knife edges on the frame and the connecting rod from the
transfer lever transferring the load on the weighing table to the machine is suspended
on knife edges in one of the horizontal arms while the vertical arm is loaded with
an adjustable weight. To the horizontal arms two graduated steel yards with sliding
weights are fixed, one of which serves to indicate the tare of the tubs, corves, boxes,
or vessels containing the coal or other articles to be weighed, while the other can be
adjusted so that it balances the minimum net weight of coal or other contents
ordinarily contained therein & the pendulous weight is used only to indicate the
excess. This is ordinarily done by means of a finger moving in front of a graduated
index sector and actuated by a pin in the pendulous lever fitting into a slot in
the finger, which latter vibrates on a fulcruin fixed to the frame of the weighing
machine.
This arrangement causes the arcs through which the finger moves for equal
increases of the load to vary and the divisions on the index sector to be unequal, and
they have to be made experimentally after the machine is finished by loading the
weighing table with standard weights. One of our improvements consists in arrange-
ing the index finger so that it vibrate on a fulcrum fixed to the pendulous vertical
lever and prolonging it on the other side of the fulcrum and guiding the end in a
straight or approximately straight line. For this purpose we attach by preference a
bracket to the pendulous lever and support the index finger in it by means of centre
pointed adjustable screws fitting into countersinks on the finger. The lower end of the

page_text: finger we connect to a horizontal link vibrating on a fixed fulcrum, similar centre
punch bearings being made use of for the joints. By this arrangement equal divisions
on the index sector can be obtained for equal increases of the load within the limits
of weights for which such pendulous lever machines are constructed.
To the bottom of the pendulous lever we attach a paddle working in a cistern con-
taining water for the purpose of Stopping undue vibration of the lever and bringing
the same sooner to a state of rest.
When the taring and minimum sliding weights are at zero on their steel yards, the
finger must also be at zero on the index sector and for this purpose ordinarilya further
weight has to be adjusted upon the transfer lever. To obviate this we fix the two steel
yards to brackets adjustable on the horizontal arms of the pendulous lever or other-
wise make the steel yards adjustable on the horizontal arms, instead of fixing them
immoveably as usual. By moving the steel yards with their weights bodily along the
horizontal arms the machine can be balanced as required.
Dated this 3rd day of April 1888.
EMMOTT & Co.,
Agents for the Applicants.

page_text: Improvements in Self-indicating Weighing Machines.
We, JOSEPH CARTWRIGHT of 13, Myrtle Terrace, Cross Lane, Salford, fitter and
JOSEPII WILBRAHAM CARTWRIGHT of 35, Withington Street, Pendleton, Salford, in
the County of Lancaster pattern maker, 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:-
Our invention relates to that class of weighing machine known as self-indicating
or pendulous lever weighing machines. In these a Tee shaped or double bellcrank
lever is suspended on knife edges on the frame and the connecting rod from the
transfer lever transferring the load on the weighing table to the machine is suspended
on knife edges in one of the horizontal arms, while the vertical arm is loaded with
an adjustable weight. To the horizontal arms two graduated steelyards with sliding
weights are fixed, one of which serves to indicate the tare of the tubs corves boxes
or vessels containing the coal or other articles to be weighed, while the other can be
adjusted so that it balances the minimum net weight of coal or other contents
ordinarily contained therein and the pendulous weight is only used to indicate the
excess. This is ordinarily done by means of a finger vibrating in front of a graduated
index sector and actuated by a pin in the pendulous lever fitting into a slot in the
finger, which latter vibrates on a fulcrum fixed to the frame of the weighing machine.
This arrangement causes the arcs through which the finger moves for equal increases
of the load and the divisions on the index sector to be unequal, and they have to be
made experimentally after the machine is finished by loading the weighing table with
standard weights. The object of our invention is to obviate this inconvenience by
connecting the index finger to the pendulous lever in such a manner that the divisions
on the graduated sector become equal for equal increases of the load.
On the drawing appended hereunto figure 1 shows a front view, fig. 2 a side view
and fig. 3 a top view of a self-indicating weighing machine fitted with our improved
arrangement, figs. 4 and 5 showing details.
a is the frame or pillar of the machine, upon which the Tee shaped lever b 61 62 is-
suspended with knife edges a¹. This lever is shewn made in three parts for convenience
of manufacture, the horizontal beam b being formed with a short vertical arm ³ to
which the vertical bars 61 and 62 are attached by screws, one bar at the front and the
other at the back of the pillar a, but these bars may be welded to the horizontal beam
or attached in any other ordinary suitable way. The arms and 6 form the vertical
pendulous lever herein before referred to. To the former the adjustable weight is
attaclied; is the connecting rod suspended upon knife edges d' in the lever b, which
connects the transfer lever receiving or supporting the load on the weighing table to
the machine. c and are the two steelyards attached to the horizontal part 6 of the
pendulous lever, the upper steelyard carrying the sliding weight el which is adjusted
so as to balance the minimum net weight of material to be weighed, while the lower
steelyard carries the sliding weight fl which is adjusted to balance the tare of the
receptacles for the material to be weighed. g is the index sector and h a finger
indicating the excess of weight over the minimum net weight. These parts are
similar to those ordinarily used and form no part of our invention.

page_text: Ordinarily the finger h is arranged to vibrate on a fulcrum fixed to the pillar a and
is actuated by a pin in the pendulous lever b¹, or be fitting into a slot of the finger h,
whereby the inconveniences herein before described are produced. Our improvement
consists in arranging the finger so that it vibrates on a fulcrum fixed to the pendulous
lever and prolonging the finger to the other side of the fulcrum and guiding the end
in a straight or approximately straight line. As shewn on the drawing, we fix upon
the pendulous lever be a stud with a knife edge on which the finger vibrates, the
finger being formed with an opening into which a steel plate 2 is inserted and rests
upon the knife edge it, as is shewn in detail by fig. 4.
The lever his connected at its lower end 3 to a rod k with forked end ¹ by a pin
or equivalent means. A bracket bolted to the arm m cast or attached to the pillar a
has a ring n bolted to it, the inner edge of which is knife shaped at the front and serves
as fulcrum to the rod k hooked upon it as shewn in detail by fig. 5. The other end
of the rod k connected to the finger is arranged to be vertically below the knife
edges on the pillar a supporting the pendulous lever. The steelyards c and f are carried
by carriers arranged to clip the horizontal arm b of the pendulous lever and
adjustable on the same, by means of which arrangement the steelyards can be shifted
on said arm so that when the table of the weighing machine is not loaded and
the weights and flare put at zero, the pendulous lever and finger are
in the positions shewn on the drawing with the finger at zero, and the use of additional
weights on the transfer lever to effect this adjustment is hereby obviated. On the
weight e being set to the minimum weight of material to be contained in the
receptacles to be weighed and the weight f to balance the tare, the finger will also be
at zero when a receptacle containing this weight is on the weighing table, and
additional weights in the receptacle will cause the finger to move to the right and
indicate the excess. The divisions for equal increases of the load will be equal, as the
lengths of the arms of the finger do not vary in different positions of the pendulous
lever, as is the case when the finger vibrates on a fulcrum fixed to the pillar a and is
moved by a pin on the lever b¹ or 3 working in a slot of the finger, or a pin on the
finger working in a slot in the lever b' or 63.
(
The end of the lever arm has attached to it a paddle working in a cistern o'
containing liquid for the purpose of obviating or reducing oscillations of the pendulous
lever. A sliding weight is arranged on the lever arm 6 to balance variations in the
weight of the weighing table or platform caused by changes in theweather or collection
of rain on the same.
Instead of the knife edged fulcra used for the rod k and finger h centre pointed
adjustable pins or screws placed opposite each other in one of the parts and fitting
into counter sinks on the other part may be used. It is obvious that the finger h may
be arranged to vibrate in front of the pillar a and be actuated by the arms 61 instead
of being placed at the back as shewn and actuated by the arm 63.
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,
In selfindicating weighing machines ärranging the index finger h so that it vibrates
on a fulcrum i upon the pendulous lever and prolonging the finger to the other side of
said fulcrum and guiding the end h³ in an approximately straight vertical line by
means of a link k, substantially as herein before described and illustrated.
1 11
1511
Amament 1000
EMMOTT & Co.,
Agents for the Applicants.