Improvements in Fastening Devices for the Covers and Bottoms of Centrifugal Cream Separators.
Year: 1894

page_text: Date of Application, 5th June, 1894-Accepted, 21st July, 1894
COMPLETE SPECIFICATION.
Improvements in Fastening Devices for the Covers and Bottoms of
Centrifugal Cream Separators.
I, ERIK GUSTAF NICOLAUS SALENIUS, of Drottninggatan 2, Stockholm, in
the Kingdom of Sweden, Mechanician, 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 the fastening of the lids or covers of centrifugal drums
in such a manner that the said lids will always occupy an unaltered position on the
drum.
Hitherto the said lids have been secured directly to the drum by being screwed
on the same. The threads however soon become worn and although this does not
prevent the lid from being tightened in the usual way, it generally results that the
lid after being tightened has an oblique position on the drum. This fault which
the workman in charge of the apparatus may not be able to correct, may however
act prejudicially to the motion of the drum as well as to the separating operation,
as it not only disturbs the centering of the drum but changes the distance of the
cream outlet on the lid from the centre.
The object of this invention is therefore the fastening of the lid in such a way
that the threads on the same may be dispensed with and this fastening obtained
simply by pressing the lid close to the drum by means of a number of attachment
screws, which are, in any convenient manner, united with the lid or the drum.
These screws may be arranged differently, some examples of which are hereinafter
described.
In the accompanying drawing,
Figure 1 is a vertical section of a drum with my improvements applied thereto.
Figure 2 is a vertical section of a drum with a modified form of fastening.
Figure 3 is a plan of Figure 1 partly in section, and
Figures 4, 5 and 6 show further modifications.
According to Figure 1 a ring 6 of angular cross section is placed upon the lid a
in such a way as to clasp the edge of the lid and the drum. The ring is retained
on the drum by means of projections c which from the inner side of the descending
flange of the ring enter under corresponding lugs or projections d on the drum.
The ring can therefore by a slight turning movement be easily put into its place
or removed therefrom. The flange of the ring extending over the lid is traversed
by set screws directed towards the lid. In order to provide projecting heads of
the screws these are provided with square holes to receive the key. The lid having
been put on the ring 6 is put in place and the screws are tightened by degrees
uniformly all around, it being easily ascertained when the screws are equally tight
and consequently also when the lid is tight. At the lower part the lid is provided
with a guiding flange g and between the lid and the drum the usual packing-ring h
is arranged.
In Figure 2 there is no ring but the construction is the same in substance in so
far that the top part k of the drum has a flange similar to the ring shown in
Figure 1 and that between this flange and the drum there is an intermediate
bottom m corresponding to the lid a, Figure 1.
The connection between the drum and the ring or the two divisions of the drum
can also be effected in the manner shown in Figure 4, where the drum has a high
rim, provided on the inner side with lugs or projections with which engage corre-
sponding lugs on the ring or the upper division. The set screws which press,
n Figures 1-4, against the lid are attached to the drum, but this arrangement

page_text: may be reversed as shown in Figure 5, where the lid itself is provided with lugs
or projections engaging with corresponding lugs or projections on the drum. The
former lugs are traversed by set screws directed towards the latter.
Figure 6 shows another method, consisting in that the set screws are passed
through lugs or projections on the drum and intended to press against other
lugs or projections projecting from the lid or from a flange on the top part of the
drum.
The screws can also be provided with heads, but these should not exceed the
ring or the lug, which ought to be of such a thickness, that the head-may-be sunk
in a recess sufficiently large to allow the key to be put on. It is not always
necessary to have lugs or projections, the ring Figure and the top part
Figure 2, can for instance, be screwed on to the drum without the before-
mentioned advantages of the invention being lost because the ring has a com-
paratively small mass with relation to the lid and the cream outlet is not
dependent on said ring. Moreover the thread may be interrupted so that a
slight turning will suffice to unscrew or to fasten the ring. When securing the
ring, the lid and the like, the same are turned in the direction opposite to the
rotatory direction of the drum and a suitable stop is arranged for determining
the amount of movement. If the bottom of the drum is to be made detachable,
it can evidently also be fixed in one or other of the ways mentioned. It is likewise
evident that the flange of the ring passing over the lid can be so wide and also
perforated that the ring is more like a bottom or a cover.
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. A locking device for the loose lids or bottoms of centrifugal drums consisting
of a number of set screws retaining the lid or the bottom to the drum, these
set screws being attached to the drum or to the lid or the bottom, the drum
and the lid or the drum and the bottom being moreover provided with lugs or
projections, which engage with each other and hold the said parts detachably
together.
2. The modification of the arrangement, specified in the first claim, in which the
screws are fixed in a special annular or bottom-shaped part, which may constitute
a special division of the drum (Figure 2) and is by means of lugs, screw
threads or the like so united with the drum that it may be easily removed from the
same.
Doted this 5th don of Tune 1904
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant..