Improvements relating to Ore-concentrators.
Year: 1890

page_text: Date of Application, 25th Aug., 1890
Complete Specification Left, 23rd Sept., 1890-Accepted, 20th Dec., 1890
PROVISIONAL SPECIFICATION..
[Communicated from abroad by GEORGE EDWIN WOODBURY, Machinist, of
31, Golden Gate Avenue, San Francisco, California, United States of
America.]
Improvements relating to Ore-concentrators.
I HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
This invention relates to ore-concentrators of the kind or class wherein an
endless travelling band or apron is employed.
The improved concentrator is constructed with standing corrugated sides which
form expanding edges, thereby increasing the efficiency of the apparatus.
Dated this 25th day of August 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements relating to Ore-concentrators.
I, HENRY HARRIS LAKE of the firm of Haseltine Lake & Co. Patent Agents
45 Southampton Buildings in the County of Middlesex 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 :-
My invention relates to an improvement in endless belts or aprons having
raised or standing sides, such as are used in certain classes of ore-concentrating
machines;
and it has for its object to produce a raised side or standing edge that
will not break down or split or otherwise be injured in running over the drums or
rollers around which these aprons are carried in their endless travel.
Referring to the accompanying drawings that forms part of this Specification,
Figure 1 represents a view in perspective of a portion of an endless-travelling
concentrator-belt at one of its ends where it turns over the end roller, the raised
sides of the belt being constructed according to my invention.
Figure 2 is a top view or plan of a portion of the belt.
Figure 3 is a transverse section through one standing edge and a part of the
bottom.
Figure 4 is a longitudinal section through the body on a line parallel with the
standing edge.
Figure 5 shows the expanding edge produced in another form.
In carrying out my said invention I form the standing side or rim on a belt or
endless travelling apron with a corrugated or fluted or plaited top portion, producing
an excess in length of the material particularly along the top over the length of the
belt or of the lower part of the standing rim where it joins the belt. The folds or
corrugations or plaits should be made of such length or size that they furnish the
additional length required at the top edge of the standing rim when the belt is
turned from a straight line into a curved or circular line, as in passing around the
end rollers of the machine, and such addition in length depends on and is to be
determined by the size of the roller, and also to some extent by the height of the
standing side, as its top edge lies in a greater circle than the bottom or the line of
junction with the belt, and consequently increases in length with the height of the
standing edge above the surface of the belt. At the, present time these endless

page_text: travelling belts are made of rubber or rubber cloth, and the raised sides are usually
formed of rubber strips having somewhat greater elastic quality than the body of
the belt in order to stretch along the top edges, the sides being moulded onto or
formed with the body of the. belt in various ways. By any of the modes of
manufacture now employed this expanding edge can readily be made in either of
the forms which are herein shown and described, or in such other equivalent form
that will secure the desired end and object.
The height of the standing edge and the amount of stretch it undergoes along the
top are to be considered in determining of what size and depth the forms or
corrugations should be made; but as these folds or corrugations do not affect the
functions of the standing edge, but on the contrary act to stiffen it or preserve its
upright position, there need be observed no exact proportion of size of corrugations
to the height of the standing side being formed. The essential point in its
production is to provide sufficient excess of material at and along the top edge to
supply the additional length that the edge would be stretched if its elasticity alone
were relied upon. In practice the edge standing about three-fourths of an inch
above the face of the belt will be required to stretch about one and one-half
inches on the top line in every foot of its length on a drum or roller of sixteen
inches in diameter.
The corrugations in that form of standing edge represented in Figs. 1 to 4,
inclusive, are of uniform curvature disposed equally on both sides of the longitudinal
centre line, and diminishing in depth towards the bottom, at which point they
merge into the flat portion to leave the lowermost portion of the face, and
particularly the inner face, of the raised side where it joins the flat surface of the
belt smooth or without indentations.
Figure 5 represents an edge of straight folds with sharp turns or angles.
In the drawings, A indicates the body of the belt, B B the standing sides, and
the extensible edge on the standing side.
X
The letter indicates the drum or roller around which the belt is carried, and
6* illustrates the form assumed by the standing side when expanded or extended on
the roller.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to me
by my foreign correspondent I declare that what claim is :-
1. A concentrator-belt or endless travelling apron having raised or standing
sides the edges of which are fluted or corrugated at right angles to the surface of
the belt to form an expanding top edge, substantially as herein described.
2.-A raised or standing side for endless travelling belts or aprons having an
excess in length of the material' along the top edge, which is disposed in folds or
corrugations at right angles to the surface of the belt, forming an extensible
standing edge, for operation as set forth.
Dated this 23rd day of September 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.