IMPROVEMENTS IN SUSPENDED LEVER WEIGHING MACHINES
Year: 1882

page_text: LETTERS PATENT to Thomas Williams, the younger, of Myddelton Square,
in the County of Middlesex, Engineer, for an Invention of "IMPROVEMENTS
IN SUSPENDED LEVER WEIGHING MACHINES."
PROVISIONAL SPECIFICATION left by the said Thomas Williams the
younger at the Office of the Commissioners of Patents on the 7th February
1882.
THOMAS WILLIAMS the younger of Myddelton Squaro in the County of Middlesex
Engineer. "IMPROVEMENTS IN SUSPENDED LEVER WEIGHING MACHINES."
This Invention relates to suspended weighing machines on the steelyard
principle operating without loose weights and consists of the following combination
or arrangement of parts, whereby their construction is simplified and they are
rendered more compact whilst at the same time greater accuracy and delicacy of
action are obtained, that is to say:- steelyard which may be provided with the
ordinary arrangement of centres but with a view to lightness and to facilitating its
manufacture I prefer to make of round tubing which can be readily marked (if
desired) in a lathe. Combined with this steelyard there is a transfer lever con-
nected by a shackle with the steelyard and provided with knife edge centres which
work on loose self adjusting swivelling bearings working in hollow cups in the
bottom of a rectangular frame or box which completely encloses the whole of the
working parts of the machine and which is left open on one side sufficiently to
allow of the adjustment of the sliding weights the said cups being capable of being
set up or adjusted vertically by screw-nuts or otherwise to compensate for wear
and to allow of more easy adjustment of the machine.
The object of the self adjusting or swivelling bearings is to ensure that they shall
always adjust themselves to the centres of the transfer lever when the machine is
at work. The transfer lever is disposed with its fulcrum underneath the steelyard
and at a point about midway between the fulcrum of the steelyard and the free
end thereof whereby tilting of the machine is avoided greater compactness is
ensured and the load can be suspended from near the centre of the machine.
Din C

page_text: The knife edge centres on which the transfer lever works are inverted centres
fixed vertically in the lever so as to allow of the swivel bearings in which they
work being much deeper in their seating which will consequently retain more oil
whilst at the same time an obvious increase in the strength of such vertically
disposed centres which bear the entire strain of the transfer lever is obtained. The
centres from which the load is suspended from the transfer lever by a U or double
shackle are disposed horizontally on each side or face of the transfer lover.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Williams the younger in the Great Seal Patent Office
on the 5th August 1882.
THOMAS-WILLIAMS the younger of Myddelton Square in the County of Middlesex
IMPROVEMENTS IN SUSPENDED LEVER WEIGHING MACHINES.”
Engineer.
EE
My Invention relates to suspended lever weighing machines intended to operate
without loose weights on the steelyard principle whereby this class of machine is
rendered more compact whilst at the same timo greater accuracy and delicacy of
nction are obtained and the risk of errors in weighing with loose weights is
avoided.
According to my Invention I employ a steelyard along which the heavy weight
is moved or adjusted such steelyard being composed of round tubing as this
tubular form of steelyard is not only lighter but is also susceptible of being more
readily and accurately marked or notched in a lathe. I combine with the steelyard
a transfer lever connected thereto by a shackle and provided at its weighing end
with inverted knife edge centres which rest upon loose swivelling bearings working
in hollow cups inside a suspended rectangular box or frame (cast by preference in
one piece) which completely encloses the whole of the working parts of the
machine and which is left open on one or both sides sufficiently to allow of easy
access to the sliding weights. The before mentioned swivelling bearings are self
adjustable in a circular direction and are by preference capable of being set up or
adjusted vertically in their cups by adjusting screws nuts or otherwise.
The object of the loose self adjusting or swivelling bearings is to ensure that
they shall always adjust themselves to the centres of the transfer lever when the
machine is at work. The transfer lever is disposed with its fulcrum below the
steelyard and at a point about midway between the fulcrum of the steelyard and
the free end thereof whereby tilting of the machine is avoided greater compactness
is ensured and the load can be suspended on the vertical centre line of the
machine.
The knife edge centres on which the transfer lever works are inverted centres
fixed vertically in the lever so as to allow of their entering a short distance inside
the cups in which the swivel bearings work such bearings being much deeper in

page_text: their seatings or cups and consequently the latter will retain more oil. The centre
or centres from which the load is suspended from the transfer lever by a suitable
shackle are disposed horizontally on each side or face of the transfer lever when
two such centres are used. A suitable index plate is employed in connection with
the before mentioned tubular steelyard on which are marked the heavier weights.
The lighter weights are marked on a separate beam or index plate connected with
the before mentioned tubular steelyard and carrying its own sliding weight.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the explanatory Sheet of Drawings hereunto annexed the
same letters of reference indicating corresponding parts in all the Figures.
Figure 1 of my Drawings represents a side elevation of my improved suspended
lever weighing machine showing the enclosing suspended rectangular box or frame
in vertical section. Figure 2 is a transverse vertical section of the said machine
taken along the line 1-2 in Figure 1. Figure 3 is an end elevation corresponding
to Figure 2 of the tubular weighing steelyard and index plates and their sliding
weights. Figures 4 and 5 represent respectively a detail vertical section and plan
of one of the swivelling boarings in its cup.
A is a cast iron box or frame enclosing the weighing apparatus and provided at
the top with one or more lugs a for suspending the same. From a cross spindle
screwed into the upper part of this box or frame there is suspended in the interior
thereof a double shackle B in which the usual knife edge outer centres bb of the
steelyard are supported such centres projecting from the opposite sides of the
counterbalancing head C. The inner end of the tubular weighing steelyard D is
screwed or otherwise securely fastened into this head. c is an inner knife edge
centre situate behind the outer centres bb and from this inner centre c there is
suspended a hook E which engages under the inverted inner knife edge centre d
at the free end of the transfer lever F. At the opposite or weighing end of this
lever F there are provided two sets of knife edge contres ee and ff. The
centres e e are inverted centres and are fixed perpendicularly into the upper or
horizontal part of the transfer lever F on each side thereof such lever being made
for convenience of fixing the centres of a T section at its weighing end as shown
clearly in Figure 2. These inverted centres e e rest upon loose swivel bearings g g
contained in circular cups formed in lugs or projections h h cast inside the frame A
at or near the bottom thereof. These bearings g g are free to turn or swivel inside
their cups and are also capable of being set up or adjusted vertically by the
adjusting screws i i. The knife edge centres e e being inverted and projecting
perpendicularly downwards from the underside of the overhanging edges of the
lever F are enabled to descend more or less inside the said cups thereby permitting of
the tops of the bearings g being sunk below the edge of their cups and consequently
the said cups will contain a greater quantity of oil. The knife edge centres ff are
disposed horizontally in the lever F and project out from each side of the vertical
part of the T end of such lever (see Figure 2). These centres should by preference
be in the same horizontal plane with the inverted inner centre d at the free end of
the lever. By having the inverted centres e secured vertically to the horizontal
part of the T shaped lever and the centres f secured horizontally to the vertical
portion of such lever I am enabled to fix the two sets of centres e and ƒ close
together or as nearly as may be required in the same vertical plane in the said
transfer lever and thereby obtain facility for weighing heavy loads with a com-
paratively short steelyard. The load to be weighed is suspended by a hook
(shown broken away in Figures 1 and 2) from the double shackle k which is hung
from the horizontally disposed outer knife edge centres ff. The heavy weight
which is moved along the steelyard D is provided with a knife edge m which engages
into the annular notches or divisions in the said steelyard and is further provided
with an index or pointer n which indicates on the index plate o the weights of the
heavier denomination whilst the weights of smaller denomination are indicated by
moving the small sliding weight p along the suitably graduated index plate q.

page_text: These two index plates o and q are rigidly secured at one end by screws or
otherwise to the head C whilst their opposite ends are fixed by screws to the metal
plate (Figure 3) which serves to maintain them parallel to the steelyard D.
Free access is afforded to the heavy and light weights as well as to the usual
adjusting or regulating screw & carrying a small travelling counterweight & con-
tained in the head C through a suitable opening left in one or both sides of the
box or frame A. A slotted guide or bridle piece is secured inside the box or
frame A at one end thereof as shown in section at Figure 1 for the purpose of
guiding and controlling more or less the vertical movement of the outer or free end
of the steelyard D which projects therein and is thereby also prevented from
receiving any anduo lateral moveinent.
Having now described and particularly ascertained the nature of my said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the hereinbefore iu part
recited Letters Patent is :-
First. In a suspended lever weighing machine the combination with any suitable
steelyard of a transfer lever arranged as specified and provided at its weighing end
with inverted knife edge centres fixed vertically therein and resting upon sunk
swivel bearings in oil cups inside a suspended box or frame enclosing the working
parts and with horizontally disposed knife edge centres supporting the shacklo
which carries the load to be weighed substantially as hereinbefore described.
Secondly. The application and use to and in suspended lever weighing machines
of a steelyard composed of round tubing substantially as and for the purpose
specified.
Thirdly. The combination and arrangement of parts constituting a suspended
lever weighing machine substantially as hereinbefore described and illustrated by
my Drawings.
In witness whereof I the said Thomas Williams-the-younger-have-hereunto_
set my hand and seal this Second day of August in the year of our Lord
One thousand eight hundred and eighty two.