Improvements in the Manufacture of Centrifugal Drums for Cream Separators and the like.
Year: 1895

page_text: Date of Application, 26th Nov., 1895-Accepted, 28th Dec., 1895
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Centrifugal Drums for Cream
Separators and the like.
I, ERIK GUSTAF NICOLAUS SALENIUS, of Albano, in the Kingdom of Sweden,
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 :--
Centrifugal drums which are designed to revolve at a great speed, such for
instance, as those employed for cream separators, are rather expensive to manu-
facture owing to the necessity of making them of forged metal either in the form
of plates, which have to be bent and chased to the shape of a vessel or of a solid
piece, which is then hollowed out. The wall of the drum must however be rather
thick, which makes the drum heavy.
This invention relates therefore to a new method of manufacturing centrifugal
drums consisting in bending a flexible metal pipe, for instance a copper or steel pipe
into a spiral corresponding to the desired shape of the drum. The spiral coils are
united close to each other by means of soldering or in any other suitable way. Such a
drum will be very light and strong and will probably be found cheaper to make
than those heretofore used owing to the shorter time required for its manufacture
and to the perfected methods now at hand for making and bending pipes. In
lieu of coiling up the pipe into a spiral, hoops or rings of pipes may be made
and attached closely to each other by means of soldering or in some other
suitable way.
The accompanying drawing shows a vertical section of a drum of the kind
herein referred to.
The bottom of the drum is formed of a plate a and upon this the spiral pipe b
is attached. The coils of the latter are widened or contracted according to the
desired shape of the drum. As shown on the drawing it is even possible to
produce in this way a drum with two compartments c and d. It is also possible to
form the bottom a of a pipe by coiling up this pipe in a plane or in the shape of
a cup more or less concave, as required, whereupon the spiral is made cylindrical.
If pipe rings are used, it will, however, be more advantageous to use a plate bottom.
With said rings it is also possible to give any desired shape to the drum by varying
the diameter of the rings.
The cross section of the pipe may vary, it may for instance be round, square or
of any other shape.
An advantage of the above described drum is that the contents of the same, for
instance when separating or churning may easily be heated or cooled with the aid
of a medium caused to pass through the pipe which forms the wall of the drum.
Evidently also a solid wire or solid rings may be used, which are united in the
way described by winding in spirals and attaching the layers to each other in
order to form the drum.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The method of making centrifugal drums by forming a pipe or a wire into
a spiral, the coils of which are of the same width as the width of the required
1

page_text: 2. The modification of the method described in Claim 1, which consists in
making pipe rings or wire rings of such sizes as to correspond with the shape of
the drum, the rings being then united by means of soldering or otherwise.
3. A centrifugal drum, the bottom and side or only the side of which consist of
the closely united coils of a pipe or wire coiled into a spiral or the side of which
consists of pipe or wire rings placed close together and firmly united.
4. Separating or churning or performing both operations simultaneously by
means of the drum specified in Claim 3, while simultaneously heating or cooling
the contents in the drum by means of a heating or cooling agent caused to pass
through the pipe constituting the wall of the drum.
Dated this 26th day of November 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.