Year: 1897

page_text: I, WILLIAM EDWARD HIPKINS, Managing Director of the Firm of W. & T. Avery
Limited, of Digbeth, in the City of Birmingham, Manufacturers, do hereby
declare the nature of this invention to be as follows:-
This invention consists of improvements relating to weighing apparatus, my
object being to so construct and arrange a knife edge bearing for such apparatus
that it shall automatically adjust itself to the line of the knife edges when placed
thereon, thus ensuring a perfect and constant alignment which can otherwise be
obtained in the first place only as the result of very accurate machining in manufac-
ture, and maintained by subsequent periodical attention.
I construct a knife edge bearing in accordance with my invention, from a block
of steel or of wrought iron steel-faced, having the lower part grooved to a suitable
obtuse angle and hardened to form the bearing surface for the knife edge. I
extend the upper portion of the bearing to form ears or lugs which stand up at
right angles to the line of the knife edge, and form a circular hole in each of such
ears or lugs. The sides of the bearing parallel to the line of the knife edges are
made to a concave configuration.
A leg or support is provided for the knife edge bearing of such a width that the
ears or lugs herein before described will fit loosely thereon; and such leg or sup
port has extended arms or projections which loosely fit to concave recesses on each
side of the bearing. Immediately opposite the circular holes in the cars or lugs
I form a circular opening in the leg or support, somewhat larger than such open-
ings in the ears.
When the knife edge bearing is placed upon the leg or support with the holes
in the respective parts opposite to each other, a circular pin or a split cotter is
passed through the holes for the purpose of securing the two parts together, but
in such a manner as to permit. of a slight lateral rocking motion. The bottom of
the groove or channel formed between the ears of the knife edge bearing and that
formed by the two lugs upon the leg or support, provides the fulcrum from
which such rocking movement is obtained; the bearing surface upon the leg or
support is made slightly convex to permit of the movement.
When the knife edge bearing is affixed to the leg or support and then placed
upon the knife edge, the slight rocking motion hereinbefore described allows

page_text: the bearing to automatically adjust itself upon the knife edge, whilst preventing
any undue movement either laterally or at right angles to the knife edge.
Dated this 1st day of Nov 1807
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.
Improvements relating to Weighing Apparatus.
I, WILLIAM EDWARD HIPKINS, Managing Director of the Firm of W. & T. Avery
Limited, of Digbeth, in the City of Birmingham, Manufacturers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
1
.
This invention consists of improvements relating to weighing apparatus, my
object being to so construct and arrange a knife edge bearing for such apparatus
that it shall automatically adjust itself to the line of the knife edges when placed
thereon, thus ensuring a perfect and constant alignment which can otherwise be
obtained in the first place only as the result of very accurate machining in manu-
facture, and maintained by subsequent periodical attention.
In the accompanying sheet of explanatory drawings to be hereinafter referred
to.―
Figure 1 is a side elevation, Figure 2 a sectional end elevation, and Figure 3
an inverted plan of my improved knife edge bearing in position on its leg or
support.
Figure 4 is a plan of the knife edge bearing alone.
The same reference letters in the different views indicate the same parts.
I construct a knife edge bearing in accordance with my invention, from a block
of steel or of wrought iron steel-faced, having the lower part A grooved to a suit-
able obtuse angle and hardened to form the bearing surface for the knife edge,
of the weighing machine. I extend the upper portion of the bearing to form cars
or lugs as AA which stand up at right angles to the line of the knife edge, and
form a circular hole in each of such cars or lugs. The sides A³ A' of the bearing
parallel to the line of the knife edge are made to a concave configuration.
A leg or support B is provided for the knife edge bearing of such a width that
the ears or lugs A³ A hereinbefore described will fit loosely thereon; and such
leg or support has extended arms or projections B' 133 which loosely fit the con-
cave recesses on each side of the bearing. Immediately opposite the circular
holes in the ears or lugs I form a circular opening in the leg or support, some-
what larger than such opening in the cars.
When the knife edge bearing is placed in position on the leg or support with
the holes in the respective parts opposite to each other, a circular pin or a split
cotter is passed through the holes for the purpose of securing the two parts
together, but in such a manner as to permit of a slight lateral rocking motion.
The bottom of the groove or channel formed between the ears of the knife edge
bearing and that formed by the two lugs upon the leg or support, provides the
fulcrum from which such rocking movement is obtained; the bearing surface upon
the leg or support is made slightly convex to permit of the movement.
When the knife edge bearing is affixed to the leg or support and then placed
upon the knife edge, the slight rocking motion herein before described allows the

page_text: bearing to automatically adjust itself upon the knife edge, whilst preventing any
undue movement either lateral or at right angles to the knife edge.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the tame is to be performed, I declare that what I
claim is:.
-
Improved knife edge bearings for weighing apparatus constructed and arranged
substantially as and for the purpose described and as illustrated.
Dated thin and
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.