IM- PROVEMENTS IN SELF-INDICATING WEIGHING MACHINES
Year: 1877

page_text: LETTERS PATENT to John Greenwood, of the City of Manchester, in the
County of Lancaster, Weighing Machine Maker, for the Invention of " IM-
PROVEMENTS IN SELF-INDICATING WEIGHING MACHINES."
Sealed the 10th July 1877, and dated the 11th January 1877.
COMPLETE SPECIFICATION filed by the said John Greenwood at the Office
of the Commissioners of Patents on the 11th January 1877.
JOHN GREENWOOD, of the City of Manchester, in the County of Lancaster,
Weighing Machine Maker. "IMPROVEMENTS IN SELF-INDICATING WEIGHING
MACHINES."
The objects of this Invention are to enable the weight on the weighing machine-
to be readily and accurately indicated on the dial, and to effectually check the
vibration without detriment to its accuracy.
My improvements in self-indicating weighing machinery consist in connecting a
suspending vibrating. paddle, which is immersed in a semicircular box or tank
containing water, mercury, or other fluid. The suspended paddle is in connection
with a three-armed lever, which connects the weighing machine with the dial, the
vibration of the dial being checked by the suspended paddle, and this arrange-
ment can be fixed either below or above the dial, no springs being required.
The paddle is made to perform a portion of a revolution by means of the three-.
armed lever connecting the weighing machine with the dial, and to the end of one
arm of the lever is fixed a rack which works a pinion fixed on the dial spindle,
and the paddle working in the semicircular box or tank which contains the fluid
is effectually checked from vibrating by the resistance of the fluid. To prevent
back lash a strap is placed round the shaft of the pinion and connected to a weighted
lever, which brings the teeth to bear at the same side at all times when at rest, and
to one arm of the three armed lever can be attached a counter-balance for receiving
weights to weigh heavier loads.
On the lower arm of the three armed lever is a weight for adjusting and
balancing the machine, which weight may be raised or lowered by means of screws
and nuts, and moved outwards or inwards by another screw from the side of the
machine.

page_text: The objects of this Invention are to enable the weight on the weighing machine
to be readily and accurately indicated on the dial, and to effectually check the
vibration without detriment to its accuracy.
The nature of my improvements will be readily understood by the following
description thereof, reference being had to the figures and letters on the accom-
panying Sheet of Drawings, in which Fig. 1 is a plan, part in section; Fig. 2, a front
view; and Fig. 3, a side view, part in section.
In the various Figures a represents the box or framework of the machine to
which is connected a suspended vibrating paddle b balanced by the adjusting nut
and screw c, the paddle being immersed in a semicircular box or tank d containing
water, mercury, or other fluid. The suspended paddle b is in connection with a
three-armed lever e, f, g, (the bearing or fulerum being marked h) which connects
the weighing machine with the dial, the vibration of the dial being checked by the
suspended paddle b.
The paddle is made to perform a portion of a revolution by means of the three
armed lever e, f, g, connecting the weighing machine with the dial, and to the end
of one arm of the lever is fixed a rack i, which works a pinion j fixed on the dial
spindle, and the paddle b working in the semicircular box or tank d which contains
the fluid is effectively checked from vibrating by the resistance of the fluid.
To prevent back lash in the rack and pinion a strap k is placed round the shaft
of the pinion and connected to the weighted lever which encircles the dial
spindle, which arrangement brings the teeth to bear at the same side at all times
when at rest; and to one arm f of the three-armed lever can be attached a counter-
balance for receiving weights to weigh higher numbers.
For ascertaining and denoting the tare I place a weight on the lever f of the
three-armed lever e, f, g. The weight m on the lever g of the three-armed lever e, f, g,
is for adjusting and balancing the machine, and can be raised and lowered by a
screw n and nuts o for adjusting, and moved outwards or inwards for balancing by
placing a key on the end of the screw p, and the rod q is to convey the weight
from the platform to the three-armed lever.
This Invention is of great utility in weighing rapidly and accurately where
continuous loads are passing over, as at colliery pit banks, railway depôts, and other
places where economy of time and labor are considered, as the weights are checked
or read off without stoppage of traffic.
Having now described the nature and particulars of my said Invention, and the
manner in which the same is to be performed, I desire it to be understood that I
claim in self-indicating weighing machines,-
First. The suspended vibrating paddle b immersed in a box or tank d containing
water or other fluid, as and for the purposes shewn and described.
Secondly. The three-armed lever e, f, g, as and for the purposes shewn and
described.
Thirdly. The sliding weight m for adjusting and balancing the machine, as shewn
and described.
And, Fourthly. The weighted lever and arrangements connected therewith for
dispensing with the back lash in the rack and pinion, as shewn and described.
In witness whereof, I, the said John Greenwood, have hereunto set my hand
and seal, this Twenty-eighth day of November, in the year of our Lord One
thousand eight hundred and seventy-six
TOTIN
ADEENWOOD
JOHN GREENWOOD. (L.S.)