Improvements in the Manufacture of Bowls or Drums for Centrifugal Milk and Cream Separators.
Year: 1897

page_text: Date of Application, 20th Apr., 1897
Complete Specification Left, 13th Jan., 1898-Accepted, 19th Feb., 1898
PROVISIONAL SPECIFICATION.
1--
Improvements in the Manufacture of Bowls or Drums for Centrifugal
Milk and Cream Separators.
We, WILLIAM JOSEPH ASHWORTH, of Parsonage Street, Dursley, Bookkeeper, and
THOMAS STEVINSON, of Westdene, Kingsholm Road, Gloucester, Engineer, both in
the County of Gloucester, do hereby declare the nature of this invention to be as"
follows:-
This invention relates to improvements in the manufacture of separating bowls or
drums of centrifugal machines for separating milk and cream.
7
The drums of centrifugal separating machines as usually constructed are made of
cast or pressed metal and in order to permit of their withstanding the centrifugal
action to which they are subjected they are made of considerable thickness and are
consequently of considerable weight. The rotation of this weight at a high speed
obviously requires more power to drive it at a certain speed than a bowl or drum of
less weight would require.
The object of our invention is to construct a drum which combines the necessary
strength with such an abnormal degree of lightness as is impossible to be obtained
with the old construction; thus allowing either a very much larger quantity of liquid
to be dealt with than heretofore with the same amount of power as is required to
drive the ordinary bowl or drum; or allowing the same amount of liquid as in an
ordinary drum to be as effectually operated upon by the expenditure of a very much
smaller amount of power, thereby enabling a much smaller and cheaper machine to
equal in capacity the more expensive ones now in use.
In constructing a bowl or drum in accordance with our invention, we provide a body
or shell of the required shape made of aluminium or other suitable metal or alloy
preferably of light specific gravity, or of wood pulp, papier-mâché or other suitable
inaterial and we bind or coil around this vessel metal wire or ribbon, in order to
support the shell against the bursting strain. In some cases where the nature of the
material of which the shell is composed renders it advisable, the said shell may be
provided with a liner..
Improvements in the Manufacture of Bowls or Drums for Centrifugal
Milk and Cream Separators.
:
We, WILLIAM JOSEPH ASHWORTH, of Parsonage Street, Dursley, Bookkeeper, and
THOMAS STEVINSON, of Westdene, Kingsholm Road, Gloucester, Engineer, both in the
TH Q

page_text: County of Gloucester, 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 relates to improvements in the manufacture of the bowls or drums
of centrifugal machines for separating milk and cream.
The drums of centrifugal separating machines as usually constructed are made of
cast or stamped metal and in order to permit of their withstanding the centrifugal
action to which they are subjected they are made of considerable thickness and are
consequently of considerable weight. The rotation of this weight at a high speed
obviously requires more power to drive it at a certain speed than a bowl or drum of 1
less weight would require.
The object of our invention is to construct a drum which combines the necessary
strength with such an abnormal degree of lightness as is impossible to be obtained
with the old construction; thus allowing either a very much larger quantity of liquid
to be dealt with than heretofore with the same amount of power as is required to 1
drive the ordinary bowl or drum; or allowing the same amount of liquid as in an
ordinary drum to be as effectually operated upon by the expenditure of a very much
smaller amount of power, thereby enabling a much smaller and cheaper machine to
equal in capacity the more expensive ones now in use.
In constructing a bowl or drum in accordance with our invention we provide a body
or shell of the required shape made of aluminium, magnesium or alloys of these.
metals of light specific gravity or of wood, wood pulp, papier mâché or other suitable
material. This body or shell is of itself insufficient to bear the strain to which it.
would be subjected and we therefore bind or coil around. this vessel metal wire or
ribbon (preferably steel) in order to provide the necessary strength and support the
shell against the bursting strain.
By the combination of this body or shell of light material with metal wire of high.
tensile strength an abnormally light bowl is produced, which as compared with bowls
composed of cast metal or of forged steel as now generally in use is of very much
less weight size for size, and of equal or greater strength. In some cases where the
nature of the material of which the shell is composed renders it advisable, the said
shell may be provided with a liner or casing.
Our invention will be readily understood by reference to the accompanying
drawings, in which :—
Figure 1 is a sectional elevation of a bowl constructed according to our invention:
Figure 2 is a sectional plan:
Figure 3 is a sectional view illustrating a modification of our invention.
Similar letters of reference indicate corresponding parts in the several figures.
a is the bowl or drum and b is the binding around the same which binding will
during the rotation of the bowl support the latter against the bursting strain to which
it is subjected. In the drawing the binding is in the form of wire but it will be
obvious that metal tape or ribbon will be equally efficacious. When the bowl a is
made of a material with which the milk may come into direct contact without
detriment no internal lining is required; when, however, the bowl is made of a
a material such as wood, wood-pulp, papier-mâché or the like we advantageously arrange
within the bowl a liner c as shewn in Figure 3 made of thin sheet metal or other
material which will not injure or be acted upon injuriously by the milk.
In some instances instead of using a liner inside a wood or like vessel we may use
it inside a metal vessel, that is to say, the bowl would be composed of two layers of
metal with a wire binding.
Although in the drawings we have represented the bowl as having only a single
Tayer of binding material it is to be understood that two or more layers may be
applied to the exterior of the bowl if desired. It is also to be undersood that our
invention is applicable to bowls of varying shape the bowl shewn in the drawing
being only given as an example.
Having now particularly described and ascertained the nature of our said
•

page_text: invention and in what manner the same is to be performed, we declare that what we
claim is :-
1. A bowl or drum for centrifugal milk and cream separators composed of a metal
or material of relatively light specific gravity and having an external binding of
wire or metallic ribbon, substantially as, and for the purpose, described.
2. The combination with the bowl or drum of a centrifugal milk and cream
separator of an external binding of metallic wire or ribbon and an internal lining of
material which will not injure or be injured by the milk, substantially as, and for
the purpose, described.
1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.