Year: 1886

page_text: Date of Application, 25th Nov., 1886.
Complete Left, 25th Aug., 1887.
Complete Accepted, 27th Sept., 1887
I ARTHUR MAURICE ROBINSON of Railway works Rochdale in the County of
Lancaster Engineer do hereby declare the nature of the said invention to be as
follows:-
The invention relates to middlings purifiers in which horizontal or nearly horizontal
vibrating sieves are used in combination with a blast or current of air passing through
the said sieves.
The main objects are to provide improved means, for securing the silks or cloths
of the sieves to their carriers, for cleaning the under surface of the sieves, for
regulating the distribution of and for collecting (the dust carried away by the air
currents, for adjusting the force of the air currents and for obtaining access to various
parts of the purifier.
The invention consists first. In connecting the silk or cloth to the carrier by means
of webbing having eyelet holes which fit over pins or studs on one portion of the
carrier and are held in position by a second portion of the carrier screwed or attached
to the first portion. The silk or cloth is secured to the webbing by stitching and the
carriers are attached to the sieve frame by screws or in any convenient manner.
Second. In combining with sieves constructed as above set forth or with sieves
used in purifiers as hereinafter described a transverse reciprocating grid on which the
silk or cloth rests and which vibrates with the sieve frame. The reciprocating motion
is given to the grid, preferably by means of a diamond threaded screw and follower.
Third. In providing close above the sieve a horizontal or nearly horizontal series of
fixed or movable troughs or channels combined with valves or equivalent means for
varying the sizes of the apertures between the said troughs or channels.

page_text: Fourth. In combining with troughs or channels as above set forth; travelling
brushes having means of disconnection, and doors in the purifier to allow of sampling.
Fifth. In providing the purifier with movable transverse division pieces between
the sieve and the troughs or channels.
Sixth. In constructing purifiers having the whole or part of the improvements
herein before set forth with side openings & doors extending the length of the sieve.
Seventh. In combining with purifiers under my invention, dust collectors or filter
cloths.
Improvements in and Applicable to Middlings Purifiers.”
I ARTHUR MAURICE ROBINSON of Railway works, Rochdale 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:-
The invention relates to middlings purifiers in which horizontal vibrating sieves
are used in combination with a blast or current of air passing through the said sieves.
The main objects are to provide improved means for securing the silks or cloths of
the sieves to their carriers for cleaning the under surface of the sieves for regulating
the distribution of air, for collecting the dust carried away by the air currents, for
adjusting the force of the air currents and for obtaining access to various parts of the
purifiers.
The invention consists-First. In connecting the silk or cloth to the carrier by means
of webbing having eyelet holes which fit over or around pins or studs on one portion of
the carrier and are held in position by a second portion of the carrier screwed or
attached in like manner to the first portion. The silk or cloth is then secured to the
webbing by stitching and the carriers are attached to the sieve frame by screws or in
any convenient manner.
Second-In combining with sieves constructed as above set forth, or with sieves
used in purifiers as herein after described a transversely reciprocating grid on which
the silk cloth rests and which vibrates with the sieve frame. The reciprocating motion
is given to the grid preferably by means of a diamond threaded screw and follower.

page_text: Third-In providing close above the sieve a horizontal or nearly horizontal series of
fixed or movable troughs or channels combined with valves or equivalent means for
varying the sizes of the apertures between the said troughs or channels.
Fourth In combining with troughs or channels as above set forth travelling
brushes having means for disconnection and doors in the purifier to allow
sampling.
•
Fifth In providing the purifier with movable transverse division pieces between
the sieve and the troughs or channels.
Sixth-In constructing purifiers having the whole or part of the improvements
hereinbefore set forth with side openings having doors extending the whole length of
the sieve.
1
Seventh-In combining with purifiers under my invention dust collectors or filter
Figure 1 is a transverse section and Figure 2 a longitudinal section of a middlings
purifier illustrative of the first six heads of my invention. Figures 3 and 4 are
sectional views of detail under the first five heads.
First head-1 is the silk or cloth sewn to the webbing [2: 3 eyelet holes in
the webbing: 4 carrier provided with pins or studs 5 which pass through the eyelet
holes 3:6 strips made with holes to receive the projecting ends of the pins or studs 5
and screwed, or attached to the carrier 4. in any like or equivalent manner: 7 sieve
frame suspended within the purifier case 8, and caused to vibrate in any usual way.
The carrier 4, is attached to the frame 7 by screws or equivalent devices.
Second head-9 is a grid carried in or on guides on the frame 7 so as to be free to
reciprocate transversely. 10 is a diamond threaded screw on a shaft 11 carried in
bearings in the case 8: 12 is an arm or follower engaging with the screw 10 and
with the grid 9.-Two or more grids arms or followers and screws may be employed.
The screw shaft is caused to rotate by any suitable gear. It will be obvious that the
grid will both vibrate with the sieve frame and have a reciprocating motion in a
transverse direction.. These grids serve to clean the filter cloth.
Third head-13 are a series of horizontal troughs or channels fixed longitudinally
above the sieve, 14 are valves fitting underneath the troughs or channels and capable
of being adjusted so as to vary the area of the openings between the troughs or
channels by means of adjusting gear, 15 the troughs or channels may be movable
instead of the valves or both valves and troughs or channels may be movable.
Fourth head-16 are brushes carried on endless bands, belts or chains 17. and
receiving motion by means of shafts and pulleys 18. clutch gear is employed for
giving motion to the chains so that they can be disconnected and the motion of the
brushes arrested at any time.-19 are sampling doors.
Fifth head-20 are movable transverse division pieces between the sieve and the
troughs or channels to assist in regulating the air currents so as to render them more
uniform.
Sixth head-21-are side openings and doors extending the whole length of the
sieve so as to allow of easy access.
Seventh head-Purifiers constructed as above illustrated and described may have
dust collector or filter cloth attachments or the improvements hereinbefore specified
may be applied to purifiers generally or to purifiers fitted with dust collectors or filter
cloths. This head will be readily understood without drawings.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed-1 declare that what I claim is :—
First-Constructing sieves for middlings purifiers substantially as set forth under
the first head.

page_text: Second-The combination with sieves of middlings purifiers of a transverse
reciprocating grid substantially as set forth.
Third-In providing above the sieves of middlings purifiers a series of troughs or
channels combined with valves substantially as set forth.
Fourth-The combination with troughs or channels and valves under the third head
of brushes and sampling doors substantially as set forth.
Fifth Providing middlings purifiers with transverse division pieces substantially
as set forth.
Sixth Middlings purifiers with transverse division pieces substantially as set forth.
Seventh-Constructing middlings purifiers under my invention with side openings
and doors substantially as set forth.
Eighth Middlings purifiers under my invention with side openings and doors
extending the whole length of the sieve substantially as set forth.
Ninth The combination with middlings purifiers under my invention of dust
collectors or filter cloths.
Dated this Twenty fourth day of August 1887.