IMPROVEMENTS IN OR APPLICABLE TO THE CONSTRUCTION OF WEIGHING MACHINES 33
Year: 1883

page_text: LETTERS PATENT to Evan Thomas, of Aberdare, in the County of Glamorgan,
Safety Lamp Manufacturer for an Invention of "IMPROVEMENTS IN OR
APPLICABLE TO THE CONSTRUCTION OF WEIGHING MACHINES
33
PROVISIONAL SPECIFICATION left by the said Evan Thomas at the Office
of the Commissioners of Patents on the 17th July 1883.
EVAN THOMAS, of Aberdare; in the County of Glamorgan, Safety Lamp
Manufacturer, "IMPROVEMENTS IN OR APPLICABLE TO THE CONSTRUCTION OF
WEIGHING MACHINES
"
This Invention relates to certain improvements in or applicable to the construction
of weighing machines, and has especial reference to weighing machinery used for
colliery or other analogous purposes; for 'weighing screened small coal, or liquid,
or other matter; and the principal objects of the improvements are to ensure the
accurate weighing of the screened small coal or other matter under all usual
circumstances, to prevent any tampering with the machine in the absence of
the weigher, and a considerable saving and avoidance of damage to the indicating
dials.
The improved weighing machine, is; according to the modification which will
be now described as especially applicable, for colliery uses, constructed with two
side levers of equal length secured' to a cross shaft which rests on-bearings
preferably of cast steel. The back end of each lever is formed with a slot, and in
these slots is placed á movable balance bar which can be adjusted so as to balance
the weight of the small coal box or other receptacle, when free of coal or otherwise
empty, so as to secure a proper and even balance. When a perfect balance is
thus obtained by the shifting of the balance bar, the latter is secured by
padlocks or other fastening means so as to prevent any tampering with the
adjustment.
t
3
The coal box or other receptacle depends from the front ends of the levers and
is arranged so as to work parallel with them in order to ensure accurate weighing
even when the material is placed entirely at one end of the box. The indicator
dial is protected and saved from unnecessary strain and jerking when the small
coal or material rushes suddenly into the box, by means of a catch supported by
one of the cross beams, and one end of which grasps the balance bar while the
other end is connected by means of a rod to a hand lever which is 'actuated by
the weigher. This arrangement is such, that when the catch is pressed on the
balance bar, the machine is rendered inoperative, and will only affect the dial at
the option of the weigher.
0

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Evan Thomas in the Patent Office on the 17th January 1884.
OF
EVAN THOMAS of Aberdare, in the County of Glamorgan Safety Lamp
Manufacturer "IMPROVEMENTS IN OR APPLICABLE TO THE CONSTRUCTION
WEIGHING MACHINES"
This Invention relates to certain improvements in or applicable to the construction
of weighing machines and has especial reference to weighing machinery used for
colliery or other analogous purposes, for weighing screened small coal, or liquid,
or other matter; and the principal objects of the improvements are to ensure
the accurate weighing of the screened small, coal or other matter, under all
usual circumstances, to prevent any tampering with 'the machine in the absence
of the weigher, and to effect a considerable saving and avoidance of 'damage to the
indicating dials.
The improved weighing machine is illustrated on the accompanying drawings
in Figs 1 to 3 which respectively represent a front view, a plan view, and a
transverse section.
The improved machine is constructed with two or more side levers 1, made of
equal length and secured or made fast to a cross or main bearing shaft 2, which
rests in bearings 3, preferably formed of cast steel and carried by a suitable
framing 4. The rear end of each lever 1, is guided by a staple 5, and is formed
with a longitudinal slot 6, and in the slots 6; of the opposite levers 1, there is
placed a movable balance bar 7, which may be provided with removable weights 8,
and can be adjusted therein, so as to balance the weight of the box or other
receptacle 9, when free of small coal or otherwise empty, so as to secure a proper
and even balance. When a perfect balance is thus obtained by the shifting and
adjustment of the balance bar 7, the latter is secured in position by padlocks
or other suitable fastening means 10, so as to 'prevent any tampering with the
adjustment of the bar.
The box or other receptacle 9, into which the small coal or other' material to be
weighed is fed, depends from the front ends of the levers 1, and is arranged so as
to work parallel with them in order to ensure accurate weighing even when the
material is placed entirely at one end of the box, and it is. provided with
means 11, for emptying the small coal or other material into a wagon or other
container.
".
The indicator dial 12, is suspended from a cross beam 13, with a pivottal
connection at 14; so that it can accommodate different positions of the receptacle 9,
and the working details of the dial are looked at 15, or are otherwise connected
with a cross bar 16, connecting the suspending rods 17, of the receptacle 9. The
dial mechanism is protected and saved from unnecessary strain and jerking when
the small coal or material rushes suddenly into the box 9, by means of a catch or
retaining lever 18, supported by a cross beam 19, and one end of which lever
grasps the balance bar 7, the other end of the lever 18, is connected by means of
a rod 20, to a hand lever 21, under the control of the weigher. Thus, when the
catch 18, is brought over the balance bar 7, the machine is rendered inoperative,
and the dial is only affected at the option of the weigher.
Having thus particularly described and ascertained the nature and objects of
my said Invention and in what manner the same is to be or may be performed or
carried into practical effect, I would observe in conclusion that what I 'consider
to be novel and original and therefore claim as constituting the Invention secured
to me by the hereinbefore in part recited Letters Patent.is :-
In a weighing machine.
+
4
The herein before described improved arrangement and combination of parts, or
.

page_text: of their respective equivalents, such parts consisting of side levers made fast to a
cross bar rocking about its axis, a receptacle for the material to be weighed
depending from the levers, a balance bar adjustable about the said levers and
which can be locked or otherwise secured in its proper balancing position, an
indicator-dial and balance mechanism independently suspended and in connection
with the weighing receptacle of the machine, and a retaining lever under
independent control for grasping the said balance bar and thereby rendering the
machine inoperative and protecting the dial-mechanism from unnecessary strain
when supplying the material to be weighed to the said receptacle, substantially as
described and as illustrated on the accompanying drawings.
In Witness whereof, I, the said Evan Thomas, have hereunto set my hand and
Seal this 10th day of January, in the year of our Lord, One thousand eight hundred
and eighty four.
EVAN THOMAS (L.S.)