Improvements in and relating to Self-acting Brushes for Horizontal and other Sieves.
Year: 1897

page_text: Date of Application, 19th Aug., 1897
Complete Specification Left, 18th May, 1898-Accepted, 9th July, 1898
PROVISIONAL SPECIFICATION.
Improvements in and relating to Self-acting Brushes for Horizontal
and other Sieves.
I, GEORGE FREDERICK THOMPSON, of 29, Newstead Road, Liverpool, in the
County of Lancaster, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to an improved device for causing brushes, as applied to
the undersides of horizontal and other sieves, to travel to and fro with a positive
and regular movement, and the objects of my said invention are (A) to utilize
the motion of such sieves for actuating the said brush or brushes and (B) the
provision of means for reversing the direction of travel of the said brush or
brushes at any predetermined point.
carriage" within
My said improved device consists of a shallow frame or
which the brush is supported by pivots in the ends thereof and is free to oscillate
When inclined to the left
to a certain degree each side of the vertical line.
hand the motion of the sieve causes the brush to travel in the right hand direc-
tion and vice versa.
At certain points near each end of the sieve-or elsewhere as may be required—
suitable stops are provided against which the brush strikes causing it to turn
over into the reverse position and immediately commence travelling in the
opposite direction.
I may employ suitable springs either on the carriage or fixed at each end of
the brush path, the reaction of which when struck gives the brush carriage a
start off at each reversal of motion.
D1 1: 1041. Any of August 1897
COMPLETE SPECIFICATION.
Improvements in and relating to Self-acting Brushes for Horizontal
and other Sieves.
I, GEORGE FREDERICK THOMPSON, of 29, Newstead Road, Liverpool, 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:-
-
My invention relates to a certain improved device or apparatus for causing
brushes as applied to the undersides of horizontal and other sieves to travel to

page_text: and fro with a positive and regular movement and the objects of my said inven-
tion are to utilize the motion of such sieves to impel the said brushes and the
provision of means whereby the direction of travel of the brush or brushes may
be reversed at each end or side of the sieve or at other predetermined points in
its path.
My said improved device or apparatus in its simplest form consists of a frame
or carriage of square, rectangular or other form designed to slide upon a suit-
able rail or rails. The end members of the said carriage have dovetailed notches
formed therein into which the brush back or stock fits losely and is free to
oscillate to a certain degree each side of the vertical centre.
When the brush is inclined in one or the other direction the bristles thereof
bearing against the underside of the sieve offer resistance to movement in the
direction of inclination but not in the opposite direction; thus the motion of
the sieve together with the inertia of the brush and its supporting carriage
cause the same to travel in one or other direction until the angle of inclination
of the said brush is reversed and resistance set up in the opposite direction.
The figures upon the sheet of drawings hereunto appended illustrate my said
invention in its simple and modified forms.
Figs. I II III are elevation, cross section and plan respectively of my said
self-acting brush and carriage as applied to such sieves as plansifters and the
like.
The brush back A fits losely into the dovetailed notches in the carriage B
and is free to oscillate either way to the angles indicated being maintained in
the normal centre by the pivots H engaging the slots in the plates G as shewn
in Fig. IV.
The carriage may be supported by one centre rail or by two side ledges such
as D, D, the length of the brush and carriage being such as to nearly fit in
between the sides C, C, of the sieve frame.
At each end of the supporting rail or rails or at other points, stops such as S
are provided against which a pin such as P-or its equivalent-on the brush
back strikes and causes the brush to turn over to the opposite angle and imme-
diately commence travelling in the reverse direction.
Figs. V VI VII are elevation, cross section and plan respectively of a duplex
arrangement of brushes supported by a double centilever form of carriage, the
object of which being to effect the brushing of a sieve to its extreme ends or
sides in cases where no space exists to allow of the carriage passing beyond the
sieve margin or frame and a further object of this construction is to insure
the pressure of the two brushes against such sieve being of equal degree.
The said brushes are carried by the rocking or cantilever members A, A, mounted
upon trunnions formed upon the ends of the cross-piece B which together with
the saddle C fitting losely upon the supporting rail D constitute the said carriage.
By this arrangement each brush in its turn is enabled to travel to one or other
extreme end or side of the sieve and the angle of inclination of each is reversed
simultaneously by means of the device shewn in Fig. VIII consisting of a
coupling rod or bar R attached to the back of each brush by means of eye-bolts
as shewn or other suitable device. When the carriage reaches the end of its
path this bar strikes against the end, side or other part of the sieve frame or
against stops provided for the purpose.
By making the dovetailed notches into which the brush backs fit, of such
width at the top as to nearly fit the same (as shewn in Fig. VI) the pivots in the
ends of the brushes may be dispensed with and the same may extend beyond
the carriage thus enabling one size of carriage to be used with brushes of various
lengths.
When applied to plansifters and the like I may utilize my said brush carriages
to propel the material upon the trays beneath the sieves by attaching thereto
one or more light flaps of tin or other material as shewn at F in Figs. II and III
connected to the carriage by means of simple pivot hinges or other suitable

page_text: one side of the vertical
device so as to allow of their swinging upwards on
position but not on the other, to enable their riding over the material when
travelling in one direction and to push it along when travelling in the reverse
direction.
I may employ two brushes in combination with the form of carriage shewn
in Figs. I, II, III, or I may employ a rigid carriage of H form designed to
carry two brushes in a manner similar to that shewn in Figs. V, VI, VII.
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:-
-
1. In automatic travelling brushes for horizontal and other movable sieves
the combination with one or more plain straight-backed brushes of a carriage
consisting of a frame of square, rectangular or other form, the end or side mem-
bers thereof having dovetailed notches formed therein into which the back or
backs of the said brush or brushes fit losely and are free to oscillate to a certain
degree each side of the vertical line for the purpose of causing the bristles
thereof in bearing against the sieving medium to oppose motion in one direction
while permitting movement or "slip" in the reverse direction and the combina-
tion with the said brush or brushes of suitable pins or stops fixed in or attached
to the backs thereof designed to strike against stops located within the sieve frame
for the purpose of causing the said brush or brushes to turn over to the opposite
angle and reverse the direction of motion; also the combination with the said
carriage of a light hinged flap of tin or other suitable material for the purpose
of propelling material accumulating upon a tray beneath, substantially as herein
described and illustrated.
2. The combination with two plain straight-backed brushes, arranged parallel
to one another, of a carrier consisting of two rocking cantilever members having
dovetailed notches formed therein near the ends thereof, mounted upon trunnions
formed on the ends of a centre piece or transverse member attached to and
carried by a saddle fitting losely upon a suitable supporting rail, the said
brushes being connected by a coupling rod or bar designed to strike against
the ends or sides of the sieve frame or against suitable stops and cause the said
brushes to turn over to the opposite angle and reverse the direction of motion
substantially as herein described and illustrated.
בד
L 1
1900