Year: 1887

page_text: Date of Application, 26th Aug., 1887
Complete Left, 28th May, 1888
Complete Accepted, 6th July, 1888
I WILLIAM PARNALL of 108 Victoria Street in the City and County of Bristol
Scale Maker do hereby declare the nature of this invention to be as follows:-
:-
My invention consists in connecting the lower rod or rods, levers or hooks of
weighing machines with the swinging parts of beam scales, the connection passing
through four holes or aperatures (more or less) provided in a china earthenware, or the
like kiln dried, plate, box or stand. The said connection may be used in combination
with the said plate, box or stand and vibrating beams not having swinging parts.

page_text: Improvements in Beam Scales and Weighing Machines and Stands
or Plates Connected therewith.
I, WILLIAM PARNALL of 108 Victoria Street, in the City and County of Bristol,
Scale Maker, do hereby declare the nature of this invention and in what manner the
name is to be performed, to be particularly described and ascertained in and by the
following statement :-
This invention relates to improvements in beam scales and weighing machines
generally in which the scale pans or other equivalent are suspended from a beam by
rods or the like in such manner as to leave the pans free to oscillate and the invention
consists principally in establishing a connection between the lower extremities of the
pan supports and the base of the pedestal or pillar which carries the beam whereby
the pans may be prevented from swinging and be limited to a vertical movement
only. The beam-supporting pillar may be mounted on a box or case and another
feature of the invention consists in constructing such box or case of glass-china,
earthenware or similar non-absorbent material the underside of the box being open
and the whole secured to a wooden base.
In the accompanying drawings Fig. 1 represents a general view in perspective of
a beam scale constructed and mounted according to my invention, Fig. 2 represents
a similar perspective view of the appliances for steadying the scale pans. Figs. 3
and 4 are details of separate parts of the steadying appliances.
I
Fig. 5 is a perspective view of the scale supports and steadying appliances which
propose to use in conjunction with a balance scale having a vibrating beam without
swinging pan supports. Fig. 6 is a perspective view of the box or casing for contain-
ing the steadying appliances. Fig. 7 a vertical section thereof and Fig. 8 a plan of
the underside.
Referring to figures 1, 2, 3 and 4, A represents the ordinary balance beam
supported as usual by the pillar B which, to provide accommodation for the steadying
mechanism is mounted on a box or case C. The arms D which support the scale
pans are prolonged downwards, the prolongations D' terminating in stirrups D² which
are divided vertically by bars D3 shown more clearly in Fig. 5. Midway between
the prolongations Di and therefore directly below the base of the pillar B are four
downwardly projecting bars E; these bars are arranged so as to present four faces in
a straight line opposed to each other two and two alternately. F is the steadying bar
having ten knife edges feach of which bears against some part of either the stirrups D²
or the bars E. Thus the outer end edges bear against the insides of the stirrups.
whilst the middle end edges bear against the outsides of the dividing bars D³. Each
stirrup is thus grasped on both sides and the points of contact lying in a straight line
the friction is reduced to an almost inappreciable amount. The middle edges which
are in contact with the bars E are also in a straight line and the width of the bearing
surfaces effectually prevents any lateral oscillation of the scale pans. The steadying

page_text: bar F shown in Fig. 5 resembles the one shown in Fig. 4 as regards the formation
of the ends but instead of having four middle knife edges fit has only two as the
scale pans being supported by four pillars G are less liable to lateral oscillation than
those of the beam scale shown in Fig. 1.
The box or case H shown in Figs. 6, 7 and 8 is as before stated composed of
china, earthenware or other similar non-absorbent material. The bottom is practically
open as there is only a ledge h on each side as shown in Figs. 7 and 8. The box
rests on a wooden base J and is secured thereto by bars K. The ends of these bars
rest on the ledges and the whole of the parts are bound together by means of
screws k. By constructing the box of the above mentioned material and in the form
shown it can be readily moulded in one piece.
Having now particularly described and ascertained the nature of my said invention.
and in what manner the same is to be performed, I declare that what I claim is
1. In a weighing machine the combination with the beam hung above the load
and having swinging pan supports of a steadying bar carried by the pan supports and
kept in position longitudinally by a central bearing substantially as and for the
purpose described.
2. In a weighing machine the combination with the scale supports of a steadying
bar such as F having knife edges such as bearing on each side of the said supports
substantially as and for the purpose described and illustrated in the accompanying
drawings.
3. A steadying bar for weighing machines having the central bearing so arranged
as to prevent swivelling of the bar substantially as described and illustrated in Fig. 4
of the accompanying drawings.
4. A moulded box or case for supporting a weighing machine or balance composed
of china, carthenware or the like kiln baked material substantially as described.
5. In a weighing machine the combination of a box such as described with a
wooden base the two being connected by cross bars K and screws k substantially as
described.
Datel this 5th day of Ma.. 1000
WILLIAM PARNALL.