Improvements in the Roller-bars and the Bottom-plates of Rag Engines for Paper Making Machinery.
Year: 1896

page_text: Date of Application, 20th Jan., 1896
Complete Specification Left, 20th Oct., 1996-Accepted, 21st Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Roller-bars and the Bottom-plates of Rag
Engines for Paper Making Machinery.
I CHARLES CROOKES of Argus Works, Shoreham Street in the City of
Sheffield, Manufacturer do hereby declare the nature of my invention to be as
follows:-
The object of this invention is to construct a roller-bar or a bottom-plate that
will resist the corrosive action of the liquid in which such implements work, and
at a moderate cost.
These bars and plates have usually been made of steel which is very susceptible
to the corrosive action of acid, and I am aware that to remedy this as far as
possible, it has been proposed to place a thin plate of non-corrosive metal, (such
as brass) on each side of such bar or plate and key the series together with wedge
pieces or the like, and I therefore disclaim such a method from being included in
my invention.
I have also made such bars and plates entirely from gunmetal, but according to
this method the cost of material is too great, and I therefore propose to construct
the implements with a working portion or blade of gunmetal, and the back or
covered portion of steel or the like.
It will be understood that the roller bars travel at a very high speed, and that
the free acid from wood pulp used in the manufacture of paper, has a rapid
corrosive action, necessitating constant repairs of an expensive character.
The bars and plates which vary in length and breadth I propose to construct
from two pieces of metal, the junction being a longitudinal one.
Such a bar is illustrated in the annexed sheet of drawings.
Fig. 1 represents the blade, of non-corrosive metal.
Fig. 2 represents the back, of steel or iron.
Fig. 3 represents the complete bar.
The lower part or back of the bar, B, is embedded in the roller, and the upper
part A, projects and is the exposed working and wearing part, I therefore propose
to make the part A, of some hard non-corrosive metal, such as an alloy of copper
and tin, and the part B, of common steel or the like.
The method of fastening the two parts together which I prefer is the one
shown, which consists in setting down each part marked A', and B', longitudinally
and rivetting them together, but I may make a groove in the edge of either part
and a central tongue upon the other part to fit the said groove, or use other like
means.
By this arrangement I obtain a solid blade or working portion of non-corrosive
metal, with a back of cheaper material, and thus reduce the cost, while retaining
the maximum of durability.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.

page_text: corresponding recess with undercut ends such as B³, to receive the blade, as
shown.
By my improved construction I obtain a blade or working and exposed part A,
of solid metal of a noncorrosive character, and a protected back B, of cheaper
material, thus keeping down the cost and increasing the durability.
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 improvements in the construction of roller-bars and bottom-plates of rag
engines for paper making machinery, hereinbefore described and shown.
2. Constructing the roller-bars & bottom plates of rag engines, with a blade or
working edge of non-corrosive metal, and the back of other metal, as hereinbefore
described and illustrated.
1906
ROBT. F. DRURY, C.P.A.,
Agent for Applicant.