IMPROVE- MENTS IN THE CONSTRUCTION OF WEIGHING MACHINES
Year: 1873

page_text: LETTERS PATENT to George Chapman and George Denholm, both of
Stockport, in the County of Chester, for the Invention of "IMPROVE-
MENTS IN THE CONSTRUCTION OF WEIGHING MACHINES."
Scaled the 11th July 1873, and dated the 21st May 1873.
PROVISIONAL SPECIFICATION left by the said George Chapman and
George Denholm at the Office of the Commissioners of Patents,
with their Petition, on the 21st May 1873.
We, GEORGE CHAPMAN and GEORGE DENHOLM, both of Stockport,
in the County of Chester, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF WEIGHING MACHINES,"
to be as follows:-
This Invention relates principally to the construction of weighing
machines for weighing corves or tubs ofcoal at the pit bank, but is also
applicable to machines for weighing other goods.
We make the weighing platform square, and either with or without a
turntable, and either with or without rails, as the case may be.

page_text: We make the steelyard somewhat in the form of a tuning fork, that
is to say, of two parallel bars united at the ends, one bar having mounted
on it the "tare" weight (which may be fixed), and the other the "nett
weight which is adjustable.
"
In making a dial machine for weighing by means of a spring the free
end of the steelyard is provided with a toothed quadrant, which gears
with a similar pinion or wheel fixed on the axle of an index or finger,
which by the movement of the steelyard indicates the nett weight at
once on the dial.
The steelyard is provided with a slot in which the adjustable "tare"
weight is hung.
There is a spring bearing upon the upper side of the steelyard, which
holds it steady and prevents oscillation, at the same time that the re-
sistance of the spring to the rising of the free end of the steelyard forms
the weighing power of the machine.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Chapman and George Denholm in the
Great Seal Patent Office on the 21st November 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
CHAPMAN and GEORGE DENHOLM, both of Stockport, in the County of
Chester, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-first day of May, in the year
of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said George Chapman and George Denholm,
Her special license that we, the said George Chapman and George
Denholm, our executors, administrators, and assigns, or such others as
we, the said George Chapman and George Denholm, our executors,
administrators, and assigns, should at any time agree with and no others,
from time to time and at all times thereafter during the term therein
expressed, should and lawfully might make, use, exercise, and vend,
within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN THE CON-
STRUCTION OF WEIGHING MACHINES," upon the condition (amongst others)

page_text: that we, the said George Chapman and George Denholm, our exe-
cutors or administrators, by an instrument in writing under our, or
one of our, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the
same to be filed in the Great Seal Patent Office within six calendar
months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said George Denholm, on behalf of
myself and the said George Chapman, do hereby declare the nature of
the said Invention, and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement and accompanying Drawings (that is to say) :-
This Invention relates principally to the construction of weighing
machines for weighing corves or tubs of coal at the pit bank, but is also
applicable to machines for weighing other goods.
We make the weighing platform square, and either with or without
a turntable, and either with or without rails, as the case may be.
We make the steelyard somewhat in the form of a tuning fork, that
is to say, of two parallel bars united at the ends, one bar having mounted
on it the "tare weight (which may be fixed), and the other the "nett"
weight which is adjustable.
"
In making a dial machine for weighing by means of a spring, the
free end of the steelyard is provided with a toothed quadrant, which
gears with a similar pinion or wheel fixed on the axle of an index or
finger, which by the movement of the steelyard indicates the nett weight
at once on the dial.
The steelyard is provided with a slot in which the adjustable
weight is hung.
"tare"
There is a spring bearing upon the upper side of the steelyard, which
holds it steady and prevents oscillation, at the same time that the rc-
sistance of this spring to the rising of the free end of the steelyard forms
the weighing power of the machine.
Such being the nature and object of our said Invention, we will now
proceed to describe more in detail the manner in which the same is to
be or may be performed or carried into practical effect, and in order
that the same may be clearly understood we have annexed hereunto a

page_text: Sheet of Drawings illustrative, and have marked the same with figures
and letters of reference corresponding with those in the following
explanation thereof :-
Fig. 1 in the annexed Drawing is a side elevation, and Fig. 2 a
plan view of a double steelyard machine, made according to our
Invention.
Figs. 3 and 4 are similar views of our improved dial machine.
a, a, is the standard or frame of the machine; b, b, the weighing
platform; and c, c, the steelyard.
In Figs. 1 and 2 it will be seen that this steelyard is made of two
parallel bars placed on the same level, and united at the end, somewhat
in the form of a tuning fork, one bar having mounted upon it the
"tare" weight d, d, (which as before mentioned may be fixed), and the
other bar carrying the "nett" weight e, e, which is adjustable.
In Figs. 3 and 4 the steelyard c, c, is formed with a slot f, f, in which
the adjustable "tare" weight d, d, is hung and fixed if required. In
this case the free end of the steelyard c, c, is provided with a toothed
quadrant g, g, (see Fig. 5, which is an enlarged view (half size) of the
dial end of the machine with the dial removed, and Fig. 6 which is a
plan view of this part of the machine). This quadrant g, g, gears with a
toothed pinion or wheel h, h, fixed on the axle i, i, of the index
finger k, k, which as the steelyard c, c, oscillates indicates the “nett”
weight on the dial 1, 1; m, m, is the spring, the resistance of which
to the rising of the steelyard c, c, forms the weighing power of the
machine. The free end of this spring bears on a point n, n, at the 2
upper part of a loop o, o, which hangs on knife edge centres on the
steelyard. In order still further to prevent undue oscillation of the
steelyard we sometimes attach at the back of the dial l, l, a fan p, p,
on the axis of which is a small pinion q, q, gearing with the wheel h, h,
on the axis of the index finger.
Having now described the nature and object of our said Invention,
together with the manner in which the same is to be or may bo per-
formed or carried into practical effect, we wish it to be distinctly
understood that we claim as our Invention,-
3
Firstly. With reference to Figs. 1 and 2 of the Drawings the con- 3
struction and arrangement of the steelyards c, c, as shown and
described.

page_text: And Secondly. With reference to Figs. 3, 4, 5, and 6 of the Drawings,
we claim the adaptation of the quadrant g and pinion for actuating
the index finger, and the application of the fan p, p, for preventing
oscillation of the steelyard, as well as the loop o, o, hung upon knife
centres for communicating the pressure of the spring m, m, to the
steelyard.
In witness whereof, I, the said George Denholm, on behalf of
myself and the said George Chapman, have hereunto set my
hand and seal, this Nineteenth day of November, in the year
of our Lord One thousand eight hundred and seventy-three.
Witnessed by
GEORGE DAVIES, C.E.,
Patent Agent,
Manchester.
G. DENHOLM.
(L.S.)