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Патент USA US3078005

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Feb- 19, 1963
E. P. o. BOOTH ETAL
3,077,995
CONVEYOR BELT FEEDING MECHANISMS
Filed Dec. 8, 1960
3 Sheets-Sheet 1
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Feb- 19, 1963
E. P. o. BOOTH ETAL
3,077,995
CONVEYOR BELT FEEDING MECHANISMS
Filed Dec. 8, 1960
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3 Sheets-Sheet 2
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Feb- 19, 1963
E. P. o. BOOTH ETAL
3,077,995
CONVEYOR BELT FEEDING MECHANISMS
Filed Dec. 8, 1960
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United grates Patent 0
3,077,§95
1
Patented Feb. 19, 1963
1
2
3,077,995
nism for sweeping comminuted material olf a shelf onto a
conveyor belt comprising a carriage mounted on a track
CGNVE‘YGR BELT FEEDING ME?HANIdh/id
Edmond P. G. Booth and Eugene ‘W. linnes, Johannesburg,
Transvaal, Republic of South Africa, assignors to Ed
ward L. Eateman Limited, Johannesburg, Transvaal,
for movement to and fro along the belt parallel thereto,
at least two sweeping arms each with a sweeping face to
each side thereof and pivotally coupled to the carriage,
the arms being spaced apart along the ‘belt and coupled
together for simultaneous movement, means for limiting
Repuhiic of South Africa, a §outh African company
Filed Dec. 8, 1960, Ser. No. 74,646
Qlaims priority, application Republic of South Africa
Feb. 15, 196i)
'7 Qlaims. (Ci. 214-17)
the movement of each arm about its pivot between two
extreme operating positions each of which ensures the
10 correct position of the arm for a particular direction of
This invention relates to feeding mechanisms for con
veyor belts and other equipment requiring feeding from a
travel of the carriage and retaining means to hold the
arms in one of the two extreme positions and including an
In view of the fact that the invention
element located between the arms and movable across
is primarily concerned with feeding conveyor belts, the
the carriage between an operative condition in which the
stock-pile or bin.
term “conveyor belt” will be used in this speci?cation with 15 arms are held and an inoperative condition in which the
arms are released, said element being biased towards the
a slightly extended meaning. It is intended to cover any
operative condition, a cam along the track engaged by
thing accepting comminuted material swept o? a shelf
said element for displacement of the element towards the
for transport elesewhere.
inoperative condition to release the arms from one extreme
In the art of feeding comminuted material such as
position when the carriage approaches the end of a run
ore on to a belt from a storage bin or pile two well known
and to keep the arms released on continued movement of
systems exist.
the carriage along the run thereby to permit movement
According to one of these know-n arrangements 21 tun
of the arms to the other extreme position through engage
nel is provided under the bin and one or more gate con
ment of the arms by the material, said element being per
trolled apertures in the tunnel serve to feed material on to
mitted to return to the operative condition to hold the
a conveyor belt below the apertures. A supplementary
conveyor belt or feeder may be used to guide material
from each gate on to a main belt.
This system has various disadvantages, among which
arms in the other extreme position preparatory to move
ment of the carriage in the reverse direction.
Further in addition to the above combination a feeding
mechanism in which each arm is equipped with a horizon
mention might be made of the tendency material has to
form pipes in the bin and that the apertures have to be 30 tally disposed quadrant-like member de?ning to one side
thereof a formation against which a mating stop on the
fairly widely spaced in order not to weaken the roof of the
element is adapted to abut to hold the arm pair in the
tunnel. Further, the tunnel has to be of substantial di
correct lie for the direction of travel of the carriage, the
mensions in order to accommodate ?xed chutes for lead
quadrants being shaped to ride under the element during
ing material from the apertures onto the conveyor belt.
The other well known system is one in which a shelf is 35 the change over of the arms from one extreme position to
the other, and in which each arm is equipped with a hori
provided which is supplied with material through a series
of apertures, the material taking up its natural position of
zontally-disposed quadrant-like member de?ning to one
repose on the shelf. A rotating plough in the form of a
hub with a series of spaced vanes passes up and down the
shelf shovelling material on to the conveyor belt. The
side thereof a formation against which a mating stop on
the element is adapted to abut to hold the arm pair in the
correct lie for the direction of travel of the carriage, the
chief disadvantages of this system are (a) that a large
width of tunnel is required to accommodate the plough
and (b) due to the rotating vnature of the plough, rock
material has a tendency to become jammed between the
the change over of the arms from one extreme position
to the other, and in which spring means are provided to
quadrants being shaped to ride under the element during
vane tips and the shelf.
provide biasing action on the element.
'In the preferred forms of the invention a plurality of
An object of the present invention is to provide a feed
ing mechanism in which most, if not all, of the disadvan
for simultaneous movement about their pivots. Prefer
tages of the known system are at least minimised.
According to the invention a feeding mechanism for
ably two arms are each provided with a locking element,
each element in turn being adapted to engage a catch
adapted to hold the arms alternately in the ?rst and sec
sweeping comminuted material off a shelf onto a conveyor '
arms are pivoted on the carriage and are coupled together
belt comprising a carriage mounted on a track for movc~
ond positions.
ment‘to and fro along the belt parallel thereto, at least
one sweeping arm pivotally coupled to the carriage with
means which automatically permits change over of the
a sweeping face to each side thereof, the arm being mov
able between two operative positions in each of which
the arm is correctly angled for a particular direction of
travel of the carriage, and retaining means movable be
The catch and locking elements are part of a release
arms from the one extreme position to the other prepara
tory to the carriage being reversed.
In the preferred examples of the invention the release
means includes a member which is adapted to engage a
cam device along the track to effect change over of the
tween an operative condition in which it holds the arm in
arms, the catch being fast with the member and the mem
one of the positions and an inoperative condition in which
it releases the arm, the retaining means being biased to 60 ber being biased against the movement imposed by the
switching device.
wards the operative condition and adapted to engage a
tive condition to release the sweeping arm from one posi
tion when the carriage approaches the end of a run and
to keep the arm released on continued movement of the
carriage along the run so as to permit movement of the
arm to the other position through engagement of the arm
Other novel features will appear from the description
hereunder of an example of the invention, the decription
being with reference to the accompanying drawings in
which:
FIGURE 1 is a perspective view of the feeding mech
anism with parts broken away;
by the material, the retaining means being permitted to re
turn to the operative condition to hold the arm in the other
lI-II of FIGURE 1;
cam along the track for displacement towards the inopera
position preparatory to movement of the carriage in the 70
reverse direction.
Further according to the invention a feeding mecha
"FIGURE 2 is a sectional side elevation on the line
FIGURE 3 is a front schematic view of the device, and
FIGURE 4 is a section of an alternative arrangement
of the invention.
3,077,995
Referring to FIGURE 1, the feeding mechanism in~
A.
thus hold them until re-latching takes place for movement
cludes a carriage 4 which is moved to and fro along a
rail track 5 by means of a suitable power unit which
in the reverse direction.
is coupled to the carriage through hawsers 6. The power
unit is shown in FIGURE 3 by the reference 7.
engagement between the roller 21 and the roller track 22
by spring means 3t}. Further member 2% is constrained
for movement in a prescribed path by shoe brackets 31.
'in the arrangement shown in FIGURE 4 the rail track
5' for the carriage 4 is located directly below the shelf 9.
As the general mechanism of this example is in essence
The rail track 5 is strategically located so that a pair
of sweeping arms 8 may sweep over the top of a shelt 9
situated to receive comminuted material from a storage
bin 28. The material spills across the shelf and lies at
‘
Member 28 is spring biased against movement due to
its natural angle of repose ready to be swept off the 10 the same as that described with reference to FlGURES
shelf by the arms on to a conveyor belt 16. As material
moves off the shelf so further supplies pass out of the
bin on to the shelf.
in FIGURE 2 the detail of the arms is more clearly
shown. Each arm is held in a sleeve 11 and by splining
arm shaft 12 as shown by reference 13 a degree of verti
cal movement is allowed the arm, the arm being biased
downwardly by spring 14. The movement referred to in
this paragraph permits the arms to yield when material
gets wedged under the arms.
The arms themselves are shaped rather in the nature of
plough shares, the bow portions 15 being swept back sub
stantially.
Fast with the shaft 12 there is a quadrant 16 and the
quadrants on the two shafts 12 are coupled together as
shown by means of a coupling bar 17. On each quadrant
there is a locking element 18 and during movement of the
carriage one such element is always in contact with a
catch 19 provided by a member 20. In FIGURE 1 the
1, 2 and 3 the same references are used in all the ?gures
save in respect of the U-shaped arms 33 and the travelling
chute 34. This example has the advantage of keeping
the carriage clear of the working area at all times, the
U-shaped arms 33 being pivoted on the carriage with the
shelf in the space between the limbs of the arms. Chute
34 is coupled to the carriage and moves therewith, ma
terial being swept from the shelf through the chute on to
the conveyor belt.
In yet another example of the invention the rail track
is located directly above the shelf and not to one side
thereof. Clearly the invention provides numerous ex
amples each differing from the other in matters of detail
only.
We claim:
1. A feeding mechanism for sweeping comminuted
material off a shelf onto a conveyor belt comprising a
carriage mounted on a track for movement to and fro
along the belt parallel thereto, at least one sweeping arm
left hand locking element 18 is in engagement with its 30 pivotally coupled to the carriage with a sweeping face
associated catch 19 and clockwise rotation of the arms
about their pivots is prevented.
Towards the end of a run in one direction a roller
21 on the member 20 engages a stationary roller track
22 to move the member transversely over the carriage
to each side thereof, the arm being movable between
two operative positions in each of which the arm is cor
rectly angled for a particular direction of travel of the
carriage, and retaining means movable between an oper
ative condition in which it holds the arm in one of the
positions and an inoperative condition in which it re
leases the arm, said retaining means being biased to
wards the operative condition, a cam along the track
rant so that the arms are free to swing about their pivots.
engaged by the retaining means for displacement of the
Ultimately the arms will be moved into the position
shown in chain line in FIGURE 1 ready for movement in 4:0 retaining means toward the inoperative condition to re
lease the sweeping arm from one position when the
the opposite direction. When the arms reach the chain
carriage approaches the end of a run and to keep the
line position the roller 21 will have cleared the track
arm released on continued movement of the carriage
22 and in doing so the catch 19 on the right hand side
along the run so as to permit movement of the arm to
of the member will be positioned to engage the element
18 on the right hand quadrant. The apparatus is now 45 the other position through engagement of the arm by
the material, the retaining means being permitted to re
locked for movement in a direction opposite to that shown
turn to the operative condition to hold the arm in the
by arrow 23. Simultaneously with the re-locking step
other position preparatory to movement of the carriage
set out above the roller will urge a leaf spring arrange
in the reverse direction.
ment 24 outwardly to operate a reversing switch 25. A
2. A feeding mechanism claimed in claim 1, in which
similar roller track and reversing switch are found at 50
the carriage is mounted on wheels for movement along
the opposite end of the carriage track.
the track, and in which the rail track is located beneath
In the event of the reversing switch failing to operate,
the shelf and the arm is U-shaped to accommodate the
a buffer zone 26 on the coupling bar engages a piston
shelf in the space between the limbs of the arm.
like switch member 27 to shut off the prime mover. In
3. A feeding mechanism claimed in claim 1, in which
addition the arrangement is designed so that switch 27 55
the carriage is mounted on wheels for movement along
will be operated by the buffer zone 26 should change
the track, and in which the rail track is located beneath
over of the arms not occur, and this will take place before
the shelf and the arm is U-shaped to accommodate the
the roller is in position to operate the reversing switch 25.
shelf in the space between the limbs of the arm, and
Experimental work has shown that the arms should
further in which a chute is provided fast with the car
toe outwardly about ten degrees.
riage for the discharge of material from the shelf onto
The actual shape of the arms has been found to be a
the belt.
.
fairly critical matter and a swept back bow is practically
4. A feeding mechanism for sweeping comminuted
essential to ensure the effective Working of the mechanism.
material off a shelf onto a conveyor belt comprising a
The device of the invention provides a robust sweeping
mechanism which may be relied upon to perform its 65 carriage mounted on a track for movement to and fro
along the belt parallel thereto, at least two sweeping arms
functions e?iciently over long periods with very little at
each with a sweeping face to each side thereof and pivot
tention being required by way of servicing. Further, its
ally coupled to the carriage, the arms being spaced apart
fully automatic nature dispenses with the need for at
into a release position. In the latter position the catch
is cleared from the locking element on the left hand quad
1%. In order to check the movement of the arms and
along the belt and coupled together for simultaneous
movement, means for limiting the movement of each
arm about its pivot between two extreme operating posi
tions each of which ensures the correct position of the
arm for a particular direction of travel of the carriage
thus substantially to de?ne the extreme positions, abut~
and retaining means to hold the arms in one of the two
tendants at a loading station.
The actual rotation of the arms from one extreme
position to the other is effected by moving the arms
through the material after their release from the catch
ments 29 on the carriage engage the quadrants 1e and
extreme positions and including an element located be
5
3,077,995
tween the arms and movable across the carriage between
an operative condition in which the arms are held and
an inoperative condition in which the arms are released,
said element being biased towards the operative condi
tion, a cam along the track engaged by said element
for displacement of the element towards the inoperative
condition to release the arms from one extreme posi
tion when the carriage approaches the end of a run and
to keep the arms released on continued movement of the
6
sures the correct angle of the arm for a particular direc
tion of travel of the carriage, retaining means to hold
said sweeping arms in one of the two extreme positions
and including an element located between the arms and
movable across the carriage between an operative condi
tion in which the arms are held and an inoperative con
dition in which the arms are released, spring means for
biasing said element towards the operative condition, a
horizontally disposed quadrant-like member ?xed to each
carriage along the run thereby to permit movement of 10 arm, each quadrant member having on one side thereof
the arms to the other extreme position through engage
ment of the arms by the material, said elements being
permitted to return to the operative condition to hold
the arms in the other extreme position preparatory to
movement of the carriage in the reverse direction.
5. A feeding mechanism for sweeping comminuted
material off a shelf onto a conveyor belt comprising a
carriage mounted on a track for movement to and fro
along the belt parallel thereto, at least two sweeping
a formation, a mating stop on said element adapted to
abut to hold the arms in the correct angle for the direction
of the carriage, a cam along the track engaged by said ele
ment for displacement of the element towards the inop
erative condition to release the arms from one extreme
position when the carriage approaches the end of a run
and to keep the arms released on continued movement of
the carriage along the run thereby to permit movement of
the arms to the other extreme position through engagement
arms each with a sweeping face to each side thereof and 20 of the arms by the material, said element being permitted
pivotally coupled to the carriage, said arms being spaced
to return to the operative condition to hold the arms in
apart along the belt and coupled together for simul
taneous movement, means for limiting the movement
of each arm about its pivot between two extreme oper
ative positions each of which ensures the correct angle
of the arm for a particular direction of travel of the car
riage, retaining means to hold the arms in one of the
two extreme positions and including an element which
is located between said arms and is biased towards an
operative condition in which the arms are held but is
movable across the carriage towards an inoperative con
dition in which the arms are released, a horizontally
disposed quadrant-like member ?xed to each arm, each
quadrant member de?ning to one side thereof a forma
tion against which a mating stop on the element is adapted
to abut to hold the arms in the correct lie for the direc
tion of travel of the carriage, a cam along the track en
gaged by said element for displacement of the element
towards the inoperative condition to release the arms
the other extreme position preparatory to movement of
the carriage in the reverse direction and said quadrant
members being shaped to move past the element during
the change over of the arms from one extreme position to
the other.
7. A feeding mechanism for sweeping comminuted ma
terial off a shelf onto a conveyor belt comprising a carriage
adapted to be mounted on a track for movement to and
fro along the belt parallel thereto, at least one sweeping
arm pivotally coupled to the carriage with a sweeping face
to each side thereof, said sweeping arm being movable
between two operative positions in each of which the arm
being correctly angled for a particular direction of travel
of the carriage, retaining means movable between an op
erative condition in which it holds the arm in one of the
positions and an inoperative condition in which it releases
the arm, said retaining means being biased toward the op
erative condition, a cam along the track engaged by said
from one extreme position when the carriage approaches 40 retaining means for displacement of the same towards the
the end of a run and to keep the arms released on con
inoperative condition to release the sweeping arm from
tinued movement of the carriage along the run thereby
one position when the carriage approaches the end of a
to permit movement of the arms to the other extreme
run and to keep the arm released on continued movement
position through engagement of the arms by the ma
of the carriage along the run thereby to permit movement
terial, said element being permitted to return to the 45 of the arm to the other position through engagement of
operative condition to hold the arms in the other ex
the arm by the material, said retaining means being per
treme position preparatory to movement of the carriage
mitted to return to the operative condition to hold the arm
in the reverse direction and the quadrant members be
in the other position preparatory to movement of the car
ing shaped to move past the element during the change
riage in the reverse direction, and means causing move
50
over of the arms from one extreme position to the other.
ment of the arm on the carriage in a prescribed vertical
6. A feeding mechanism for sweeping comminuted ma
path, the arm being spring biased to the lowest point on
terial off a shalf onto a conveyor belt comprising a car
riage mounted on a track for movement to and fro along
the belt parallel thereto, at least two sweeping arms each
with a sweeping face to each side thereof and pivotally 55
coupled to the carriage, said sweeping arms being spaced
apart along the belt and coupled together for simultane
ous movement, means for limiting the movement of each
sweeping arm about its pivot between two extreme opera
tive positions each of which ensures the correct angle of 60
the arm for a particular direction of travel of the car
riage, retaining means to hold said sweeping arms in one
of the two extreme operative positions each of which en
the path and being adapted to yield upwardly against ma
terial penetrating thereunder.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,794,561
Brahmsiepe ___________ __ June 4, 1957
2,823,834
Buschrnann ___________ __ Feb. 18, 1958
2,892,552
Van Zijp _____________ __ June 30, 1959
FOREIGN PATENTS
834,227
Germany __________ _..___ Mar. 17, 1952
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