Year: 1895

page_text: Date of Application, 2nd Sept., 1895-Accepted, 29th Feb., 1896
(Figure 4 being an alternative detail hereinafter referred to)
may be circular in cross-section or prismatic or polygonal, at pleasure, and consists
as is well-known, of a number of finely-slit metallic sheets which the pulp must
pass through in order to be sorted.
The use of such apparatus has hitherto had an inseparable accompaniment of a
gradual stoppage of the slits in course of time, which it is impossible to prevent,
despite all mechanical cleansing contrivances applicable and operating during
working; and which, therefore necessitates a thorough hand-cleansing, only to be
effected while the cylinder is at rest and not working.
Now, in order to be enabled to effect this manipulation in the most complete and
thorough manner, the cylinder-shell is made to take in pieces, so that each separate
piece may be quickly and certainly cleansed, both inside and outside.
The cylinder-shell consists peripherally of two or more--in this case three-
metallic sheets m which are longitudinally turned down or bordered (Figures 2
and 3) in order to offer to an intermediate packing-block 1, of rubber, wood, metal,
or other packing material a sufficient contact and securing surface.
With a stout
metallic sheet, the border or edge may be replaced by an angle-iron rivetted on
throughout its length.
The securing of the metal sheets m upon the cylinder-covers or ends m¹ is effected
by the straps or bands n (Figs. 1 and 3) which, for the sake of closer packing as
well as the better protection of the metal-sheet, on the inside, may be lined with
leather. n are angle-pieces rivetted to the opposite ends of the straps n.
n 2 is a
bolt by which each pair of angle-pieces is drawn together to tighten the straps so
that the plates m are held securely.
In order to render the packing quite perfect, the above-named packing-places of
the metallic sheets are sunk in U-section bars o which extend from the one cylinder-
cover to the other one so as to unite the two.
For the purpose of carrying the sheet metal cylinder-shell at. intermediate
points, and also to further secure the cylinder-covers together, the bars P
arranged as shown.
are
In long cylinders, the shell may be divided transversely twice or more times;
then simply two or more of the previously described shells would meet and bear
against each other.

page_text: At the circumferential or ring joints in such a construction, the metal sheets are
carried on an internal ring, secured to the ribs o and p while, externally, a small
strap or band is secured round the cylinder; these devices are similar to those
used for fastening the plates m on the covers (Fig. 1). On the ribs o and p can
be screwed or rivetted the float-boards s of sheet-metal or wood, as is customary
in the cylinders of wood-pulp straining apparatus. In the same manner also are
secured the covers of straining cylinders well known in paper making, to the
cylinder shells as illustrated for instance in Fig. 4. In this figure the ends m¹ n¹
of the outer fabric thereon are fixed to a wood block r and these blocks are then
sunk in a broad groove o¹ (of the bar O) which serves to receive the turned-in
edges of the metallic sheets m forming the cylinder-wall proper. Then the
sheets m and the fabric-covering m¹ n' are secured by tension-rings or bands such
as n (Figs. 1 and 3) and are packed at the joint in the groove o¹ by means of the
wedge-block or bar k.
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. Securing the slotted or perforated metal sheets on sorting or washing-
cylinders for paper-pulp or wood-pulp in such manner that the metal-sheets turned
down at their longitudinal edges or bordered with angle-irons are sunk or laid in
gutter-shaped or grooved bars o and packed by bars blocks or equivalents driven
between the turned-in edges of the sheets m, and are held in place by tension rings or
bands n tightened by screw-bolts for the purpose of avoiding all screwed or rivetted
joints of the sheets m and admitting of the rapid substitution of one plate or sheet
for another.
2. In a cylinder for straining paper-pulp or wood pulp the fastening of the
fabric-covering (m² n¹) in such inauner that such in combination with the cheek of
a wood-block (c) which is sunk or laid in a U-shaped bar O forms a closed joint,
packed up tightly by the packing-block k and secured upon the cylinder proper by
tension-rings or bands.
Dated this 2nd day of September 1895.
BOULT & WADE,
Agents for the Applicant.