Improvements in Machines Used for Reducing or Pulping Materials Used in the Manufacture of Paper.
Year: 1889

page_text: Date of Application, 29th May, 1889-Accepted, 20th July, 1889
QUR ME
TUITIVAN
Improvements in Machines Used for Reducing or Pulping Materials
Used in the Manufacture of Paper.
I, JAMES GROOME of No. 47 Red Earth Road, Darwen, in the County of
Lancaster, 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 :-
This invention relates to improvements in the discs of the centrifugal beater and
pulp refiner, and to the means and manner of securing the front and back plates or
discs to the beater box, and the object is to so construct the discs that when the same
become useless through breakage of one or more of the teeth, or blades on the disc,
the broken portion can be replaced without requiring a new disc, and to securing the
front and back plates to the beater box, so that the same are mounted on cushions so
as to allow the said plates to spring slightly back, when any hard or foreign substance
gets between the disc and plate, and thus in a great measure preventing breakage,
and this invention consists of forming the discs in sections, and to securing the plates
to the beater bar by bolts, or set screws with a cushion of rubber or water space, or
springs.
Such being the nature and object of this my said Invention the following is a
complete description of same reference being had to the accompanying drawings in
which:
Fig. 1 is a front elevation of my improved construction of plate or disc employed
in centrifugal beater boxes or pulp refiners.
Fig. 2 is an end elevation partly in section of Fig. 1.
Fig. 3 is a side elevation of beater box or pulp refiner, shewing the set screw or
nuts for securing the front and back plates to the beater box.
Figs. 4 and 5 are details drawn to an enlarged scale.
According to this my invention I cast or roll the plates 1 of steel, with the teeth or
blades 2 thereon either helical, straight, or corrugated, in segments, the plate portion
of which is slightly dovetailed as at 4 and when through any cause, a tooth, or teeth 2
on one of the segments is broken, that segment is removed and another inserted in its
place, being held by the dovetail 4 and dovetail recess 6 and by a ring or band 7 of
metal, which fits round, and grips the circumference of the disc, and the intermediate
plate 8, in which is the dovetail recess 6 corresponding to the dovetail 4 on the
segment, the segment can be held more firmly in position if necessary, by passing a
rivet 9 through the same and through the intermediate plate 8. The back and front
plates or discs 10 are secured to the inside rim 11 of the beater box 12 by means of
set screw 13 or bolts, and between the rim 11 and the plates 10 is a cushion of
rubber 14 or a water space, or a series of springs held in position by the long collar 15
secured to the rim 11 forming a stuffing box and thus ensuring a certain amount of
elasticity, and allowing the discs and plates 10 to open wider when any hard foreign
substance gets between the same, and this in a great measure prevents the teeth being
broken.
Having now particularly described and ascertained the nature of this my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The improved construction and combination of the parts forming my improved
disc or plate substantially as herein described and illustrated by the accompanying

page_text: 2. The improved method of securing the front and back plates or discs to the
inside rim 11 of the beater box by means of a combination of set screw or bolt 13
cushion of rubber, spring, or water space 14 and collar or boss 15 as and for the
purpose herein described and substantially as illustrated by the annexed drawings.
Dated this 98th day of May 1884
JAMES GROOME,
By his Agent, Walter Brierley,
Town Hall Buildings, Halifax.