Improvements in Middlings Purifiers.
Year: 1889

page_text: Date of Application, 19th Mar., 1889
Complete Specification Left, 18th Dec., 1889-Accepted, 25th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Middlings Purifiers.
I ARTHUR MAURICE ROBINSON of Railway Works Rochdale in the County of
Lancaster Engineer, do hereby declare the nature of this invention to be as follows:-
The invention relates first to improvements in the middlings purifiers for which I
obtained British Letters Patent No. 15358 of the year 1886; that is to say middlings
purifiers in which a horizontal or nearly horizontal series of fixed or movable troughs
or channels are disposed close above a vibrating sieve and are combined with valves or
equivalent means for varying the sizes of the apertures between the said troughs or
channels and the object is to so combine the said troughs and valves or equivalent
devices that there shall be no surface for accumulation of material excepting in the
troughs or channels and air currents can be better regulated and directed.
My invention under this first part consists essentially in constructing each trough
or channel in two pieces each having a bottom and side and in fitting the two pieces
together one over the other in such manner that one both pieces may be moved so as
to allow of the troughs or channels being made broader or narrower. In this way the
area of the air spaces between the troughs or channels is diminished or increased.
A further improvement consists in making the edges of the troughs or channels at
an angle with one edge higher than the other so that the low edge of one trough and
the high edge of the next trough are in proximity. In this way the air currents
passing between the troughs are deflected the required degree out of a straight line to
ensure that the material carried up by the said air currents will be deposited in the
troughs or channels and be prevented from falling back on to the silk.
My invention relates second to middlings purifiers generally in which there is a
horizontal vibrating sieve and an upward current of air and the object is to remove
light branny and like particles from the tailings leaving the said sieve.
For this purpose I combine with the spout or shoot for carrying away the tailings
a trunk leading to the expansion chamber above the sieve and further I interpose
between the said trunk and expansion chamber a setting chamber provided with an
adjustable baffle board or equivalent device.
Dated this 18th day of March 1880
Per pro J. T. KING,
J. Johnson,
Agent.
COMPLETE SPECIFICATION.
Improvements in 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 first to improvements in the middlings purifiers for which I
obtained British Letters Patent No. 15358 of the year 1886, that is to say middlings
purifiers in which a horizontal or nearly horizontal series of fixed or movable troughs
or channels are disposed close above a vibrating sieve and are combined with valves or
equivalent means for varying the sizes of the apertures between the said troughs or
channels, and the object is to so combine the said troughs and valves or equivalent
devices that there shall be no surface for accumulation of material excepting in the
troughs or chambers and air currents can be better regulated and directed.
My invention under this first part consists essentially in constructing each trough
Puino G7

page_text: or channel in two pieces each having a bottom and side and in fitting the two pieces
together one over the other in such manner that one or both pieces may be moved so
as to allow of the troughs or channels being made broader or narrower.
In this way
the area of the air spaces between the troughs or channels is diminished or increased.
A further improvement consists in making the edges of the troughs or channels at
an angle with one edge higher than the other so that the low edge of one trough and the
high edge of the next trough are in proximity. In this way the air currents passing
between the troughs are deflected the required degree out of a straight line to ensure
that the material carried up by the said air currents will be deposited in the troughs
or channels and be prevented from falling back into the silk.
My invention relates second to middlings purifiers generally in which there is a
horizontal vibrating sieve and an upward current of air and the object is to remove
light branny and like particles from the tailings leaving the said sieve.
For this purpose I combine with the spout or shoot for carrying away the tailings
a trunk leading to the expansion chamber above the sieve, and further I interpose
between the said trunk and expansion chamber a settling chamber provided with an
adjustable baffle board or equivalent device.
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a tranverse section, and fig. 2 a longitudinal section of a purifier constructed
in accordance with my invention, a is the frame, bis the horizontal sieve carried and
operated in any usual manner, c, c', are troughs or channels in which the pieces c are
carried on slide bars d and have vertical sides c whilst the pieces c¹ fixed to the frame
are made with flat bottoms resting on the bottoms of the pieces c and with inclined sides
rising above the vertical sides c². The width of the troughs and the openings between
the troughs varies with the position of the pieces c which are adjusted by moving the
slide bars. Any dust and fine flour passing with the air current between the troughs
is deflected by the inclined sides of the pieces c¹ so as to fall on the troughs. e are
the usual brushes for keeping the troughs clean. f is the spout or shoot for carrying
away tailings from the sieve b, g is a trunk leading from the spout or shoot f to an
expansion chamber above the sieve, i is a settling chamber interposed between the
trunk and expansion chamber. j is an adjustable baffle board. k is a worm for
removing flour and dust from the settling chamber. 7 is the current inducing fan. As
the tailings pass down the shoot fine flour and dust are carried up the trunk by the
air current and striking against the baffle plate are deposited in the settling chamber
owing to the reduced speed the air travels on reaching the expansion chamber.
It will be evident that many modifications of my improvements may be made
without departing from my invention.
Having .now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim is
First. In middlings purifiers the combination of a horizontal sieve with adjustable
troughs substantially as and for the purpose setforth.
Second. In middlings purifiers adjustable troughs with inclined sides substantially
as and for the purpose setforth.
Third. In middlings purifiers the combination with a tailings spout or shoot of a
trunk expansion chamber settling chamber and deflecting board substantially as and
for the purpose setforth.
1939
Decembe
1889.
Per pro J. T. KING,
J. Johnson,
Agent.
Per pro J. T. KING,
J. Johnson,
Agent.