Improvements in Riddles, Sieves, and Screens.
Year: 1891

page_text: Date of Application, 1st Apr., 1891
Complete Specification Left. 31st Dec.. 1891-Accepted. 13th Feb. 1892
PROVISIONAL SPECIFICATION.
Improvements in Riddles, Sieves, and Screens.
I WILLIAM BROOKES of No. 1, Victoria Bridge, Salford in the County of
Lancaster, Iron and Wire Worker, do hereby declare the nature of this invention
to be as follows :-
I form the riddle bottom separately from the rim, into which the said bottom is
placed and if necessary secured without any portion of the wire of which it is com-
posed, passing through holes in the rim, as is the ordinary plan of securing riddle
bottoms.
I cut the webbing for the bottom to the desired diameter of circle or dimension
of rectangle if for screens, and all round the edge attach by pressure a double
metal edge, or tyre in one or more pieces.
This tyre has previously been rolled to the circle and has a U shaped section. The
pressure securely closes the two sides of the U upon the edge of the webbing and
so forms a strong and smooth edge without selvage. The pressure is so applied as
to cause the rim to sink into some of the meshes of the webbing and so to get a grip
of the wires.
The completed riddle bottom is placed in the riddle in the usual position, and can
if desired be.secured by small spikes or cramps which can be easily removed when
it is desired to insert a new bottom into the riddle.
The riddle bottom rests upon the ordinary supporting crossbars or wires.
EDGAR CONISTON MILLS,
Agent to the Applicant.
COMPLETE SPECIFICATION.
Improvements in Riddles, Sieves, and Screens.
I, WILLIAM BROOKES of No. 1, Victoria Bridge, Salford in the County of
Lancaster, Iron and Wire Worker, 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:-
I form the riddle bottom separately from the rim and place it within the rim
without any portion of the wire of which it is composed passing through the rim as
in the ordinary way of securing riddle bottoms.
By this arrangement old bottoms can be readily removed and new ones easily
inserted, and without risk of damaging the rim.
After the webbing has been cut to the required shape and size for the bottom of
the riddle or screen, I attach a double metal edge or tyre by pressure all round or
along the edge of the webbing in such a manner as to clip and hold all the wire
ends, thus forming a strong protective substitute for selvage; and the clipping
action of the tyre due to the pressure also serves to hold the tyre itself in position
on the edge of the webbing.
Referring to the accompanying drawings
Fig. 1 shews a plan view of a portion of a riddle constructed according to my
invention.
Fig. 2 shews a corresponding section of the same.
Fig. 3 shews a complete circular tyre as rolled previously to applying and
closing.

page_text: Fig. 5 shews a perspective view of a completed riddle or sieve.
In these figures a is the webbing and the "U" shaped edge or tyre, shewn
covering only a portion of the edge in Fig. 1. to make the construction clear. c is
the riddle rim. In Fig. 2, the webbing a, tyre b, and rim care shewn in section
and in their relative positions when completed, the tyre being closed upon the
webbing by pressure. In some cases I use complete tyres as in Fig. 3. in which
case the webbing has to be "sprung" into position in the tyre. In other cases 1
use two semicircular tyres as in Fig. 4. for convenience of construction.
I do not bind myself to any particular method of securing this tyred bottom into
its rim. I may for example secure it by three or more staples driven into the rim
from inside and clipping the tyre between the wires as shewn at d Fig. 2. Or the
bottom may merely rest upon stronger under cross-wires as shewn in Fig. 5.
Or a double bottom may be used, the under one being coarser and secured in the
ordinary way and supporting the upper one constructed in accordance with my
invention.
For rectangular screens I use an edging of similar "U" section but straight, and
it may be mitred at the corners or separate pieces may be used for each side.
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:
I. The tyre or edge having a "U" section and secured to the webbing of a
riddle, sieve or screen bottom by pressure applied so as to close the side of the said
tyre upon the wires of the webbing, substantially as herein before described and
illustrated in the accompanying drawings.
II. The bottom for riddles sieves or screens formed by applying the "U" shaped
tyre to the webbing substantially as herein-before described and illustrated in the
accompanying drawings.
III. The bottom for riddles sieves or screens formed by applying the "U" shaped
tyre, and secured in its position in the rim without any of its wires projecting into
or through holes in the rim substantially as herein-before described and illustrated
in the accompanying drawings.
Dated this 30th day of December 1891.
EDGAR CONISTON MILLS,
Agent to the Applicant.