Improvements in Bearings and Knife Edges of Scales or Weighing Appliances.
Year: 1894

page_text: Date of Application, 13th Mar., 1894
Complete Specification Left, 3rd Dec., 1694-Accepted, 5th Jan., 1895
PROVISIONAL SPECIFICATION.
Improvements in Bearings and Knife Edges of Scales or Weighing
Appliances.
I, WILLIAM BEILBY AVERY, Managing Director, of the Firm of
W. and T. Avery Limited, Weighing Machine Manufacturers, of Digbeth,
Birmingham, in the County of Warwick, do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in the bearings employed for the purpose
of supporting, or resting upon, the scale beam and other knife edges of scales or
weighing appliances.
The object of my invention is to construct knife edge bearings from sheet steel
or other metal, in such a manner that they may be more readily produced, tempered,
and renewed as required, than the bearings at present in ordinary use.
In carrying my invention into effect when constructing a bearing for the
purpose of supporting a scale beam, having a central knife edge, I stamp or cut
a blank of the required configuration from sheet metal, preferably steel. I shape
the blank by cutting, pressing, or other operations, suitably for seating upon or
within the upper part of the central pillar of the scales or balance, or weighing
instrument, and for carrying or supporting the knife edge attached to the beam,
and I form nibs and projecting pieces, which when bent over at right angles, serve
to secure the bearing to the central pillar. Thus when properly formed to the
required configuration, the bearing can be readily slipped into position on the
central pillar, and will be retained in position by the nipping or binding produced
by bending over the nibs or projecting pieces herein before described.
I sometimes form the bearing of such a length as to cause it to project on either
or both sides of the central pillar, and thus I am enabled to obtain any desired
length of bearing, independently of the width of the upper portion of the central
pillar.
After forming the bearing to the desired configuration, I harden and temper the
steel in any usual manner, the uniformity of the section of the bearing and the
homogeneity of the metal, enabling such hardening and tempering process to be
most readily and efficiently accomplished.
Sometimes I secure the bearing in its position by means of an aperture drilled
or formed in the said bearing, and I arrange a projecting pin from the pillar or
other support for the bearing, to pass into the said aperture. In this case I cut away
the knife edge to allow the pin to project into a recess, and I use the cut away recess
and the pin to position the knife edge in order to dispense with the ordinary nibs.
The method of producing bearings in accordance with my present invention for
supporting or resting upon knife edges attached to other parts of scales, balances,
or weighing appliances, differs in no essential particular from the method herein-
before described of constructing a bearing for supporting a scale beam having a
central knife edge. In all cases. I cut or stamp the blanks from sheet metal,
varying the configuration of the same to suit the part to which the bearing is to b
be

page_text: attached, in order to support, or to rest upon, any particular knife edge of a
weighing appliance.
Dated this 12th day of March 1894.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.
Improvements in Bearings and kneages of
Appliances.
2
I, WILLIAM BEILBY AVERY, Managing Director, of the Firm of
W. and T. Avery Limited, Weighing Machine Manufacturers, of Birmingham,
in the County of Warwick, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described aud
ascertained in and by the following statement :-
This invention relates to improvements in the bearings employed for the purpose of
supporting, or resting upon, the scale beam and other knife edges of scales or
weighing appliances.
The object of my invention is to construct knife edge bearings from sheet
steel or other metal, or material in such a manner that they may be more readily
produced, tempered, and renewed as required, than the bearings at present in
ordinary use.
In the accompanying sheet of explanatory drawings to be hereinafter referred to-
Figure 1 is an end elevation and Figure 2 a plan of one form of my improved
bearings.
Figures 3, 4 and 5 represent respectively in sectional side elevation, plan, and end
elevation, another form of the bearings with the corresponding knife edges, while
Figures 6 and 7 illustrate by a sectional side elevation and end elevation, a
further modification of the same.
In carrying my invention into effect when constructing a bearing for the purpose
of supporting a scale beam, having a central knife edge, I stamp or cut a blank of
the required configuration from sheet metal, preferably steel. I shape the blank by
cutting, pressing, or other operations to a form such as shown at Figure 1, suitably
for seating upon or within the upper part of the central pillar of the scales or
balance or weighing instrument as illustrated at Figure 2, and for carrying or
supporting the knife edge attached to the beam, and form nibs or projecting
pieces A A¹ which when bent over at right angles, serve to secure the bearing to
the central pillar. Thus when properly formed to the required configuration, the
bearing can be readily slipped into position on the central pillar, and will be
retained in position by the nipping or binding produced by bending over the nibs
or projecting pieces A A' herein before described.
I sometimes form the bearing of such a length as to cause it to project ou either
or both sides of the central pillar, and thus I am enabled to obtain any desired
length of bearing, independently, of the width of the upper portion of the central
pillar.
After forming the bearing to the desired configuration, I harden and temper the
steel in any usual manner, the uniformity of the section of the bearing and the
homogeneity of the metal, enabling such hardening and tempering process to be
most readily and efficiently accomplished.
"
117 :
Sometimes I secure the bearing in its position in the manner illustrated at
Figures 3, 4, and 5, by means of an aperture drilled or formed in the bearing B, a
projecting pin as C' from-the pillar or other support C being arranged to pass into

page_text: and through the said aperture. In this case I cut away the knife edge D as shown
at Figure 3 to allow the pin to project into a recess and I use the cut away recess
and the pin to position the knife edge in order to dispense with the ordinary nibs or
positioning pieces.
Instead of stamping and shaping the hearing from one piece of sheet steel, I
sometimes form it from two or more separate pieces of sheet metal such as B' B'
and attach each piece independently to the pillar or support preferably by means of
pins as at Figures 6 and 7. The knife edge D¹ is of a section as shown in the end
view Figure 7 or of such other section as is suitable to the particular weighing
appliance to which it is attached.
The method of producing the bearings in accordance with my present invention
for supporting or resting upon knife edges attached to other parts of scales, balances,
or weighing appliances, differs in no essential particular from the method herein-
before described of constructing a bearing for supporting a scale beam having a
central knife edge. In all cases I cut or stamp the blanks from sheet metal, varying
the configuration of the same to suit the part to which the bearing is to be attached,
in order to support, or to rest upon, any particular knife edge of a weighing
appliance.
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. The method of forming knife edge bearings for scales or weighing appliances
from sheet steel or other metal or material substantially as hereinbefore described
and as illustrated in the accompanying drawings.
2. The construction of knife edge bearings for scales or weighing appliances
from sheet steel or other metal shaped suitably for seating upon the central pillar
or other part of the appliance, and having securing nibs or projecting pieces
substantially as herein before described and as illustrated in the accompanying
drawings.
3. The construction of knife edge bearings for scales or weighing appliances
from one or more pieces of sheet steel or other metal shaped suitably for seating
upon the central pillar or other part of the appliance, and secured to the same by
pins or by other independent attachments, substantially as hereinbefore described
and as illustrated in the accompanying drawings.
4. In the construction of scales and weighing appliances the combination of a
knife edge having a recess formed therein to receive the end of a positioning pin,
with a bearing formed from one or more pieces of sheet steel or other metal,
substantially as hereinbefore described and as illustrated in the accompanying
drawings.
THIS DOC way
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicant.
1