Improvements in or connected with Lever Weighing Machines.
Year: 1896

page_text: Improvements in or connected with Lever Weighing Machines.
I, HENRY POOLEY, Junior, of Albion Foundry, Manchester Street, Liverpool, in
the County of Lancaster, Engineer, do hereby declare the nature of this Invention
to be as follows:-
This Invention has reference to lever weighing machines; and has for its object
to provide improvements in or in connection with such machine, as hereinafter
specified.
According to one part of this invention, I provide in connection with the levers
of the weighing machines, especially those of large size, a loose seat for holding
or carrying the knife edges, by which the necessity of handling and machining
the said levers for fitting and applying the knife edges, is obviated, and the easy
adjustment and fitting of same in position is effected."
In the application and practice of the invention, the seats are first made in
solid form, and are placed in the mould or form when the levers are cast; and they
may be of tapered and dovetail shape. These blank seats, when the casting is
taken from the mould, can be knocked out end-wise, and are, after being marked
off for the centring of the knife edges in them, at the right distances apart, and
positions, taken away and tooled and cut out in the form, say, of a tapering channel or
groove, to receive the base of the knife edge which rests upon them, the knife
edges being held down in position by a suitable tail passing through the seat and
the lever. The seat may be constructed and adapted for fixed knife edges, or
knife edges having a rocking or similar adjustment, for adjusting their distances
apart. The invention also provides for a ready bodily adjustment of knife edges,
as by filing or cutting away the seat at one side, the knife edge may be adjusted
more or less to that side; and furthermore, the different knife edges of a machine.
are interchangeable.
In the case of a machine having knife edges and levers arranged and constructed
as described, requiring repairs or adjustments with respect of knife edges, it is
only necessary to remove said knife edges or seats, and not to take out the whole
levers.
A further improvement in lever weighing machines, for weighing horse vehicles,
consists in the construction of the platform. According to this improvement, the
platform is made on its upper surface with flanges at its sides and ends, and longi-
tudinal flanges within the sides, forming shallow pits or open boxes; and these
pits or boxes are filled with granite or other suitable setts, wood blocks, concrete,
or the like, having spaces running transversely to their length, by which the
horse in passing over the platform, in drawing the cart onto it, can obtain a firm
foothold. In the centre, or at a suitable point of the platform, a manhole and
cover of suitable size is, in some cases, provided. This platform (may be provided
with suitable girders or beams underneath, by which it is borne on the knife
edges of the machine.
In weighing machines of the kind herein referred to, I construct the transferring

page_text: lever of wrought metal bars (such as of H-iron), and separate cast blocks or brackets
containing the knife edges, and fitting upon and attached to the lever or bar.
By this construction, the blocks and knife edges may be easily adjusted; and when
the machine requires repairing they can be easily removed and readjusted, without
requiring the whole lever or arm to be taken away or out.
Dated this 18th day of December 1896
CHEESBROUGH & ROYSTON
Applicant's Patent Agents, 15 Water Street, Liverpool.
eigning
I, HENRY POOLEY, Junior, of Albion Foundry, Manchester Street, Liverpool, in
the County of Lancaster, Engineer, do hereby declare the nature of this Invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This Invention has reference to lever weighing machines or weigh bridges, and
has for its object and effect to provide improvements in or in connection with
such machine, as hereinafter specified.
The improvements according to this Invention are illustrated in the accompany-
ing drawings. In these drawings, in which the group of views under Figures 1
and 1 shew the mode of mounting and constructing knife edges; Figures 2, 3,
and 4 shew the construction of transferring lever; and Figures 5, 6, and 7, are
respectively plan, part longitudinal section, and cross section, shewing the plat-
form and the whole weighing machine according to the invention.
Referring in the first instance to Figures 1 and 1 which comprise a side sec-
tional elevation and end view, and an enlarged scale detail, a represents the knife
edges proper; are seats in which they are supported; and c represents the end
of a weigh lever. The mode of construction is as follows:-In casting the lever,
blank seats b which are of the full width of the lever and of suitable metal-say
steel are first made in solid form, and are placed in the mould or form in which
the levers care to be cast; and these blanks are preferably of dovetail or like
shape, as shewn. After the casting is taken out of the mould, the seats b are,
after being marked off for the centring of the knife edges, at the correct distances,
knocked out sideways of the groove in which they rest in the lever; and are then
taken and planed or machined to the desired shape to receive the knife edges a.
This machinery forms a channel along the face of the seat with sides sloping
towards each other downwards and the backs or bases of the knife edges are
made of a corresponding form-as shewn in Figure 1 to an enlarged scale-so,
as to cause them to become firmly seated and incapable of movement out of the
true and desired position. The knife edges a are provided with a shank a which
passes through a hole bored in the lever c, and the knife edge is drawn up in
position in its seat by a nut on the end of the shank a¹. By the above description
and illustration, it will be plain that by the mode of mounting and constructing
knife edges as described, they can be easily and accurately fitted, and the levers
of weighing machines as regards their knife edges, can be repaired cheaply, as it
will be unnecessary to take the levers themselves to the repair shop, since the
knife edges a themselves can be readily taken from their seats to the workshop
and readjusted; and then taken back and placed again in their rests in the levers.
The seat may be constructed and adapted for fixed knife edges, as shewn, or
knife edges having a rocking or similar adjustment for adjusting their distances
apart; and it also provides for a ready bodily adjustment of knife edges as by

page_text: filing or cutting away the seat at one side, the knife edge may be adjusted more or
less to that side; and, furthermore, the different knife edges of a machine are
interchangeable.
The improvement connected with the transferring lever of a weigh bridge
according to this invention is illustrated in Figures 2, 3, and 4, which comprise
end and side elevations, and plan, of the three parts of the lever, the general views
of which are shewn in Figures 5 to 7, hereafter described. The type of lever
shewn, is one in which, the resistance or pull is at one end; the weight is applied
at a point between its extremities; and the fulcrum is at the other end; and these
three portions are shewn, respectively, in Figures 2, 3, and 4. This lever consists
mainly of a wrought iron or steel flanged beam d of section, on the upper flange
of which, at the resistance end, a cast bracket e (Figure 2) is bolted, on the outer over-
hanging end e of which the knife edge a is held, under the edge of which, the
lower part of the rod connecting it with the steelyard of the machine, will come.
Then in the centre, at the point where the two ends of the beams c act upon the
beam d, there is a cast block or bracket f (Figure 3) bolted to the flange of the
beam, and holding a double knife edge a, the bearing parts, viz. the ends, of
which project outwards on either side, over which the links, connecting this lever
with the weighing levers c pass. At the other end of the beam there is a pro-
jecting block or bracket h which is bolted down onto the beam, and the overhanging
part of which is extended out at h' on either side, and each horn or point is pro-
vided with a knife edge a of the type or kind illustrated and set forth with reference
to Figure 1. By this construction, the blocks or brackets h containing the knife
edges may be readily adjusted; and when the machine requires repairing, the
knife edges and blocks or brackets can be easily removed, and readjusted, without
requiring the whole lever or arm to be taken away or out.
The improved construction of platform of a weigh bridge, according to this
Invention, is shewn in the general views of the weigh bridge shewn, namely, in
plan, part longitudinal section, and cross section, in Figures 5, 6, and 7.
respectively.
According to this improvement, the platform, which is generally designated i,
is made with flanges at its sides and ends, formed-say cut-upon the plate 3,
preferably, with transverse and longitudinal flanges within the side and end
flanges, and forming shallow pits or open boxes; and these pits or boxes are filled
with granite, wood, concrete, or other suitable blocks or sets k. By
these sets or blocks--the rows of which, laterally, have in some cases,
spaces between them-a horse, in passing over the platform, in pulling a cart
or other thing onto it, is enabled to obtain a good foothold; around the platform i
there is a frame m, and the upper edge of the flanges i' of i is about level with this
frame.
In some cases, platforms may be provided with a manhole and cover of suitable
size, to enable entrance to be got to the pit of the machine. In the complete
machine shewn, the two outer ends of the triangular levers c are supported by
their knife edges on the bottoms of rings o, carried on the frame m; whilst the
knife edges of these levers which take the weight transmitted to them from the
platform, bear upon the underside of the thrust blocks 2 on the under side of
the platform i. The other end of the levers c are borne by the rings q, and these
rings are carried by the knife edges supported by the intermediate blocks f of the
transferring lever d.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim
is:-
1. The improved mode described of mounting and constructing the knife edges
of the weighing levers of lever weighing machines.
2. In a lever weighing machine, the improved detachable knife edges, sub-
stantially as set forth and shewn, for the purposes specified.

page_text: 3. In a weigh bridge or like weighing machine, the construction of transferring
lever comprising the flanged beam d, with blocks or brackets fastened thereto;
substantially as set forth for the purposes specified, and as shewn in the drawings.
4. A weigh bridge having a platform, comprising a metal or bottom plate with
flanges thereon, constituting together shallow pits or open boxes, and adapted to
receive and hold pavement sets or blocks, substantially as set forth.
5. The several constructions of portions of weighing machines, particularly
as shewn in and set forth with reference to Figure 1; Figures 2 and 4; and
Figures 5 to 7, respectively, of the drawings; and acting, as and for the purposes
specified.
Dated this 18th. day of September, 1897.
CHEESBROUGH & ROYSTON
Applicant's Patent Agents, 15 Water Street, Liverpool.