Improvements in Cream Separators.
Year: 1892

page_text: Date of Application, 29th Feb., 1892-Accepted, 2nd Apr., 1892
Improvements in Cream Separators.
I, AUGUST MALMROS, late Farmer, residing at Uplandsgatan 39, in the City
of Stockholm, Sweden, 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:-
My invention relates to apparatus for separating cream from milk and comprises.
the improvements hereinafter described.
In the accompanying drawing,
Figure 1 is a vertical section of my improved cream separator; and,
Figure 2 is a sectional plan view of part of the same.
The apparatus comprises a screw-worm A, placed in the revolving vessel B (see
annexed drawing) the axis of which worm coincides with the axis of the separator
shaft. The screw-worm is attached to a tube, between which and the worm are
openings, through which the cream can rise to the outlet C. This outlet is formed
of a hollow screw stud, and approaches a little nearer the centre of the vessel than
the inner edge of the screw-worm; consequently the cream confines itself in a
column whose perpendicular surface stands at a distance from the inner edge of the
worm equal to the distance that the outlet projects beyond the inner edge of the
said worm. Viewing the worm in cross section it will be seen that it can project
from the shaft either at a right angle or at an angle inclining upwards or downwards
towards the radius of the drum. The object of the screw-worm is to move the
cream upwards or downwards according to the situation of the outlet for the cream.
The screw-worm rotates, as will be understood, with the drum, but as the liquid
mass rotates always somewhat more slowly than the drum, it is affected by the
screw. In seperators as hitherto used the cream, generally, owing to its being
highly compressed, is discharged principally from the space nearest the outlet and
in this way there will, of course, be an afflux of the cream farthest from the outlet,
but at the same time, also, there will be an afflux of the milk nearest the outlet, which
is evidently disadvantageous. If on the other hand, the screw-worm is employed, the
cream is forced to move towards the outlet. It has been ascertained by experiment
that, even though the area of the milk and cream outlets in an ordinary milk separator
without this screw-worm is regulated so as to give a continuous and even discharge,
it will soon be seen by inserting the screw-worm that, without altering the outlets,
the discharge of cream will be increased to a considerable degree, which proves
what a good effect the screw-worm has.
By the use of the screw-worm the mass of cream is sucked or drawn towards the
outlet, the result of which is that only the purest cream is discharged, and that the
working capacity of the separator is very much increased. It should be observed
that in the drum there is no, radial wing forcing the liquid mass to partake of the
motion of the centrifugal drum. The pitch of the worm, its inner and outer
diameter, and its inclination towards the radius of the drum may of course vary
according to circumstances. The screw-worm will, evidently, continue to have the
desired effect even though the perpendicular surface of the liquid should recede
from the interior edge of the worm. In order to hold the screw-worm A in place
in the rotating vessel B the following means is used. D is a tube descending from
the cover E, of the vessel to its bottom. The principal purpose of this tube is to
conduct the milk into the separator, and it is therefore provided at the bottom with
openings through which the milk streams out and is caught by the wings F. The
milk then passes over the edge G, under the conical screen H, and out towards
the periphery of the rotating vessel. The tube D is provided with a greater or
lesser number of projections I which should be made wider towards the periphery

page_text: of the vessel as shewn in detail in Figure 2. In the screw-worm A. there are
corresponding slots, so that when the screw-worm with these slots is pressed into
its place on the gibs it will be solidly secured. The same means is employed for
holding in place the screen H, and the upper screen K, immediately under the cover
of the apparatus. The skim-milk is discharged through the openings L.
It is obvious that the screw-worm does not need to be made in a single piece
but can be made in sections, secured and put together in any suitable manner, thus
rendering it easy to clean. It is also evident that the screw-worm may be plain or
corrugated.
"
Having now particularly described and ascertained the nature of the said inven--
tion and in what manner the same is to be performed, I declare that what I
claim is:
:-
1. In a cream separator, a screw-worm placed in the drum, the axis of which
screw-worm coincides with the axis of the separator-shaft and is entirely or partially
submerged in the revolving liquid mass for the purpose of causing the mass of cream
to be conducted by the same to the outlet situated at the top or at the bottom of
the drum, substantially as hereinbefore described.
2. The improved cream separator hereinbefore described and illustrated in the
accompanying drawing.
Dated the 29th day of February 1891.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.