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Патент USA US3080992

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March 12, 1963
E. R. BORCHERDT
3,080,982
HAULAGE SYSTEM FOR EXCAVATED MATERIAL
, Filed Nov. 9, 1959
INVENTOR
.
EDWARD R. BORCHERDT
BY
,0
r[;/‘
ATTORNEYS
United States Patent‘ 0 "
3,986,982
Patented Mar. 12, 1963
2
3 080 982
HAULAGE SYSTEM non F’JXCAVATED MATERIAL
Edward R. Borcherdt, Butte, Mont, assignor to The
Anaconda Company, a corporation of Montana
Filed Nov. 9, 1959, Ser. No. 851,741
8 Claims. (Cl. 214—1)
of the trolley wires. By these means, the truck can be
driven at low speed between the loading area and lower
terminus and the dumping area and upper terminus of
the roadway and at high speed on the roadway itself.
In one form of the invention, guiding means are in
cluded for automatically steering the truck as it travels
over the roadway. Thus, the truck can be driven at
This invention relates to means for hauling excavated
low speed by an operator between the loading area and
material and, more particularly, to a haulage system for
lower terminus and the dumping area and upper termi
an open pit mining or stripping operation or the like 10 nus of the roadway and at high speed without an opera
which includes a relatively steep trolley roadway slop—
tor on the roadway itself. Also, the truck may be pow
ing upwardly out of the pit and a plurality of electric
ered by a plurality of motors mounted in a respective
trolley trucks which can ascend the roadway at relatively
plurality of truck wheels. Such motors may provide
high speed with heavy loads and which are equipped with
electro-dynamic braking means for braking the truck dur
‘auxiliary motor-generator units for low-speed operation 15 ing its downward travel on the roadway. Resistance
independent of the trolley.
,Excavated material is conventionally hauled from an
open pit mine over an inclined roadway, often spiralling
upwardly from the bottom of the pit, by means of a
means on the truck may be included for dissipating elec—
trical energy generated by these braking means.
One of the most important characteristics of this new
haulage system is that the electric trucks employed are
number of diesel trucks of 30 to 50 tons maximum ca 20 supplied with a great amount of power when they most
pacity which travel up and down the roadway from a
need it, that is, as they ascend the roadway out of the
loading area on the ?oor of the pit to a dumping area
pit while carrying a full load. This means that the
outside the pit. To insure that the trucks can operate
trucks can haul greater loads at faster speeds up steeper
even under bad weather conditions, the slope of such a
grades than ever before. At the same time, they supply
roadway does not normally exceed about a 7 percent 25 themselves with su?icient power from their auxiliary gen
grade. Typical heavy-duty diesel trucks of up to ap
erators to operate independently of the trolley at the
proximately 600 horsepower can ascend roadways of this ‘ .lower loading area and the upper dumping area. Thus,
type at speeds of about 3 or 4 mph. maximum, though
the trolley wires and towers are con?ned to the road
at the high altitudes where many open pit mines are
way where ‘they do not interfere with the operation of
located, their output horsepower may be as much as one 30 the shovels and other excavating equipment in the load
‘third their sea-level rating.
ing area. In this regard, a portable form of trolley tower
It is the primary purpose of the present invention to
is provided to permit an especially flexible arrangement
provide a' considerably improved haulage system for
of the new haulage system. Also, as a result of the
transporting excavated material from open pit mines and
above-mentioned guiding system, hostlers are required to
the like‘which greatly reduces the personnel, power costs, 35 drive the trucks only between the loading and dumping
and time required to remove a given amount of exca
vated material. For transporting the excavated material
from'the bottom of the pit to a dumping area outside
of the pit, the invention provides a particularly steep
areas and the upper and lower ends of the roadway
respectively, and not on the‘ considerably longer incline
of the roadway itself.
A preferred embodiment of the new haulage system
roadway having a grade of 15 percent or more, so that 40 is described below, wherein
.
its length for a predetermined rise may be exceptionally
FIG. 1 is a schematic vertical section of an open
short. In fact, it is contemplated that in many cases
pit mine equipped with the haulage system of the inven
such a roadway may be directed upwardly out of the
tion;
.
mine pit in a straight line without spiralling up in the
FIG. 2 is a perspective view of a base for the trolley
conventional manner. The invention also proposes to use 45 towers which renders the towers portable; and
heavy trucks of as much as 70 to 100 tons capacity whic
FIG. 3 is an enlarged elevation partly in sectionof
can ascend the roadway when loaded at speeds of up
an electric truck of the type described operating on the
to about 15 mph, notwithstanding the steep grade. ‘It
is a further object that these trucks be substantially un
affected by high~altitude operation.
These and other advantages are fully achieved in the
new haulage system for transporting excavated material
from an open pit mine.
The new ‘system includes a
loading area on the floor of the pit and a dumping area _
outside of the pit. An inclined roadway slopes upwardly
from a lower terminus on the floor of the pit removed
from the loading area to an upper terminus outside of
trolley cables and being steered by guiding means in
the roadway.
'
In FIG. 1, an open pit mine 10 is shown which in
cludes a ?oor 11 and walls 12, which may be in the
usual bench form, being excavated progressively into
or toward the deposit of ore being mined.
(Quarries,
strip mines, excavations for dams etc. are also typical
of the type of operations where the new haulage system
is useful.) Explosives ‘are normally used to blast the
material free and the resulting loose material is gathered
the pit removed from the dumping area. A plurality
up by shovels as shown at £3. The excavated mate
of towers are spaced alongside this roadway from the
rial, whether it be ore or waste material or both, is then
lower to the upper terminus thereof and trolley wires 60 transported from the shovel 13, at what may be called
are suspended from the towers above the roadway
a loading area 15, to a dumping area 1'7 outside of the
throughout substantially its entire length. A source of
mine pit 10.
electrical power is provided for delivering current to
According to the invention, the excavated material is
these trolley wires.
hauled out of the pit It) over an inclined roadway l9 slop
For carrying the excavated material, at least one elec 65 ing a considerable distance upwardly from a lower termi
trioally driven truck is included. Trolley following means
nus 20 on the floor 11 of the pit to an upper terminus 21
are mounted on the truck for collecting su?icient power
outside of the pit. This roadway 19 may have an upward
from the trolley wires to permit high-speed operation of
grade of ‘about 15 percent, and if the area covered by the
vthe truck on the roadway. An electric generator powered
pit 10 is great enough it may ascend in a straight line, as
by an internal combustion engine is mounted in the truck 70 shownin FIG. 1. Preferably, the lower terminus 24) of
for delivering su?icient power to the electric motors to
the roadway 19 is removed from the loading area 15 on
permit low-speed operation of the truck independently
the pit ?oor 11 so that the roadway does not interfere with
3,080,982
3
excavation operations. Similarly, the upper terminus 21
of the roadway 19 is often removed from the dumping
area 17, particularly when it is a waste dump, because its
periphery thus extends progressively farther out from the
terminus 21 as it is ?lled with waste material.
In the form shown, the roadway 19 includes two adja
cent parallel tra?ic lanes 22 and 22’ for use by descend
4
tric motor wheels 43 may be in total as much as 1600
H.P. to ascend a 15 percent grade with a load of as much
as 70 tons of material. The United States patents to
Le Tourncau Nos. 2,733,770 and 2,763,331, contain dis
cussion of heavy duty trucks and electric motor wheels
which may be appropriate in the practice of this invention.
When the trucks 38 descend the lane 22 of the road
way 19, the electric motor wheels 43 generate direct-cur
rent which is returned through the trolley wires 29 and
22 and 22’ is surfaced with gravel and compacted by a
roller. If prolonged heavy use of the roadway 19 is an 10 29' to other trucks 3S ascending the lane 22’ of the road
way. By electro-dynamically braking the trucks 33 in
ticipated, a more permanent surface may be applied to the
this manner, the braking energy may be conserved in the
lanes 22 and 22', such as a surface of sanded asphalt. A
electrical system. Also, it becomes unnecessary to incor»
plurality of towers 23 are spaced between the lines 22
porate large friction brakes in the trucks which are sub
and 22’ of the roadway from the lower terminus 20 there
of to the‘upper terminus 21. Each of the towers 23 in 15 ject to wear, though small friction brakes must still be
included for ordinary level braking. If there are no
cludes a superstructure 24 extending laterally outwardly
trucks ascending the lane 22 as the descending trucks are
over the respective lanes 22 and 22'.
electro-dynamically braked, it is necessary that some
In FIG. 2, a specially designed portable base is shown
means be included for dissipating the energy generated
for supporting the individual towers 23. The base in
cludes a large block 25 of concrete resting on parallel 20 in the brakes. Hence, large resistance dissipators 44
(see FIG. 3) are provided to transmit this energy in the
rails 26 and 26' which are secured to the underside of
form of heat to the surrounding air. The subject of dy~
the block in any suitable manner. This permits the fork
namic braking of this sort is treated, for example, in the
of a lift truck to be inserted beneath the base so that the
aforementioned Le Tourneau Patent No. 2,733,770.
base may be easily transported. Set into the upper face
The invention provides two alternate means for ener
of the block 25 is a vertical open-ended socket pip-e 27
gizing the electric wheel motors 43 of the trucks 38.
adapted to removably receive a primary upright member
ing and ascending tra?c respectively. Each of the lanes
First, for low-speed operation on relatively level ground,
28 of the trolley tower.
et screws may be provided in
a direct-current generator powered by a diesel motor 45
the pipe 27 to lock the member 28 in place. Bases of this
is mounted on the truck. This diesel-driven generator is
type ‘may be arranged and rearranged at will along the
roadway or adjacent the loading and dumping stations. 30 capable of delivering enough power to the electric motor
wheels 43 to permit the trucks to travel independently of
Suspended from the opposite ends of the superstructure
the trolley wires 29 and 29’ on relatively level ground with
24 of the towers 215 are two pairs of trolley wires 29' and
full load at about 4 or 5 rn.p.h., particularly between
29' which extend longitudinally above the center line of
the loading area 15 and lower terminus 20 and dumping
the respective lanes 22 and 22’ throughout their entire
area 17 and upper terminus 21. Second, for high-speed
length. At least one recti?er is located in a control sta
operation on the roadway 19, a pair of trolley poles 47
tion 31 adjacent the roadway 19, at the lower terminus 20‘
and 48 are pivotally mounted on each truck to follow the
in the embodiment shown in FIG. 1, to which high-voltage
respective wires of one of the pairs of trolley wires 29
alternating-current may be delivered from a power line.
and 29'. Thus, the poles 47 and 43 include follower
The recti?er converts this line current into direct-current
which is delivered to the pairs of trolley Wires 29 and 40 means 50 ‘and 51 respectively at their outermost ends for
engagement with the trolley wires. When not in use,
29' by connectors 33 and 34 respectively. As much as
the trolley poles 47 and 48 can be lowered and secured to
3000 amperes or more of direct current may be delivered
the truck 33. When inuse, they deliver the high direct
to ‘the pairs of trolley cables from the recti?er in this
current from the trolley wires to the electric motor wheels
manner.
43 to permit the trucks 38 to ascend the roadway 19 at as
In this embodiment, a pair of signal-transmitting guid
much as 15 mph. while carrying a full load. A typical
ing cables 36 (only one of which is shown in the section
arrangement for alternate trolley or motor-generator oper
of FIG. 1) is buried several inches beneath the respective
ation is discussed in the United States patent to Potter,
lanes'22 and 22' of the roadway 19 centrally throughout
their entire length. Energizing means are provided in the
No. 2,600,320.
Also included in each of the trucks 38 is a conventional
control station 31 for activating each of the guiding cables 50
sensing means 53 which receives the signal transmitted
36. This may be achieved by connecting the upper ends
by one of the guiding cables 36 in the lanes 22 and 22’
of the guiding cables 36' and impressing an A.-C. voltage
of the roadway. The sensing means 53 should be of the
across their lower ends so that an alternating magnetic
type which determines whether it is directly over, to the
?ux field is created around the cables as throughout their
entire length. The strength of the energizing means 55 left of, or to the right of the guiding cable 36 transmitting
the signal. In response to this determination, a direction
should be strong enough so that the signals transmitted
changing device 54 in the truck 38 is actuated to steer
by the cables 36 can be readily detected above the adja
the truck over the guiding cable 36 in its lane. Thus,
cent surface of the respective lanes 22 and 22' of the
when the trucks 38 are on the roadway 19, it is not neces
roadway, ‘but controlled sur'liciently so that the signals
‘transmitted by one cable cannot be detected closely above 60 sary that a truck driver be in the cab to steer the truck
out of the pit, since it is guided automatically by the
the other cable.
The actual hauling of the excavated material from the
above-described means. The United States patent to
loading area 15 to the dumping area 17 is accomplished
Paulus ct al. No. 2,317,400 is representative of a guidance
by means of a plurality of trucks 38, one of which is
system of this type for steering vehicles automatically.
shown in detail in FIG. 3. According to the invention, 65
Other guidance systems may be quite suitable, of
each of the trucks 3% includes a load-carrying body pore
course, for steering the trucks along the roadway with
tion 40 having a capacity of as much as 100‘ tons of exca
out an operator. For example, the signal could be sent
vated material 41. The trucks 3% are equipped with wide
through the trolley wires themselves so that a buried
base tubeless tires 42 of large diameter each mounted
cable
would be unnecessary. Such a signal in the trolley
about what is known as an electric motor wheel 43. Such
wires might be an A.-C. voltage superimposed over the
wheels 43 are direct-current series-wound electric motors
primary D.-C. voltage. Alternatively, a mechanical sens
which have an armature shaft geared to the rim of the
ing device might be provided to note the angular dis
tire 42. ‘Thus, the driving motors of the trucks 38 are
placement in a lateral direction of the trolley poles with
mounted directly in their wheels and no transmissions or
“axles are required. The horsepower rating of these elec 75 respect to the trolley wires and to steer the truck accord
3,080,982
iugly so ‘that it is always guided immediately beneath its
respective ‘pair of trolley wires.
‘In'the operation of this new system‘ for removing ex
cavated material from an open pit mine, the trucks 3-8
are ‘loaded successively [with up to 100 tons of materal
by the shovel 13, or other loading equipment, at the
loading area ‘15 on the floor of the pit 10. A hostler then
6
can proceed directly to the desired dumping point not,
withstanding the fact that it may be removed from the
upper terminus 21 of the roadway.
I claim:
,
1. A haulage system for transporting excavated ma
terial from an open pit mine or the like comprising a
loading station on the ?oor of said pit and a dumping
station outside of said pit, an inclined roadway sloping
upwardly from a lower terminus on the ?oor of said pit
drives the loaded truck at about 4 or 5 mph. by means
of its diesel-driven generator to the lower terminus 20
of the roadway 19. There he dismounts and connects 10 removed from said loading area to an upper terminus
the followers 50 and 51 of the trolley poles 47 and 48
outside of said pit removed from. said dumping area, a
‘to the pair of trolley Wires 29'. This energizes the elec~
plurality of towers spaced alongside said roadway from
the lower to the upper terminus thereof, trolley Wires
lane 22’ of the roadway 19 at about 15>m.p.h. The
suspended from said towers above said roadway sub—
signal transmitted by the guiding cable 36 under the lane 15 stantially throughout its length, a source of electrical
22’ is picked up by the sensing means 53 which, in turn,
‘power connected to said trolley wires for delivering elec
activates the direction-changing device to steer theitruck
tric current thereto, at leastone electrically driven truck
38 over the guiding cable 36 along the center of the lane
adapted to carry excavated material, trolley following
'tric motor wheels 43 of the truck and it starts up the
22'. In this manner, the loaded truck proceeds without
means'on said truck for collecting sufficient power from
an'operator to the upper terminus 211 of the roadway 19 20 said trolley wires to permit high-speed operation of said
a where it comes to a stop when the followers 50 and 5-1
truck on said roadway, and an electric generator powered
run off of the pair'of trolley wires 29'. A second hostler
by an internal combustion enginemounted in said truck
then mounts. the truck and drives it by means of its
for producing su?i-cient power to permit low-speed opera
diesel-driven generator at about 4 or 5 mph. to the dump
tion of said truck independently of said trolley, whereby
ing area 17.
25 said truck is driven at low speed between the loading
After unloading the truck, the second liostler drives
the truck by its diesel-driven generator at 4 or 5 mph.
back to the upper terminus 21 of the roadway 19. He
area and lower terminus and the dumping area and upper
terminus of the roadway and at high speed on the road
way itself.
-
then‘ connects the followers 50 and 51 of the trolley
2. A haulage system for transporting excavated mate
:poles 47 and 48 to the respective pair of cables 29 over 30 rial from an open pit mine or the like comprising a load
‘the lane 22. The electric motor wheels 43 are thereby
ing station on the ?oor of said pit and a dumping sta
energized and the truck proceeds downwardly on the
tion outside of said pit, an inclined roadway sloping up,
‘roadway 19. A-sv the descending unloaded truck 38
wardly from a lower terminus on the ?oor of said pit re
reaches‘ its top speed of about 25 mph,‘ the electric motor
moved from said loading area to anfupper terminus out
wheels 43 generate a considerable amount of power 35 side of said pit removed from said dumping area, a
which‘ is delivered into the pair of trolley wires 29 for
‘plurality of towers spaced alongside said roadway from
use by the other trucks 38 ‘ascending the line 22’ in the
the lower to the upper terminus thereof, trolley wires
‘other direction or is absorbed in the dissipators 44. Upon
suspend-ed from said towers above said roadway sub
“reaching the lower terminus 20 of the roadway 19, the
stantially throughout its length, a source of electrical
unloaded truck comes to a halt and the operator drives 40 power connected to said trolley wires for delivering elec
fit at low speed hack to the loading area 15.
tric current thereto, at least one electrically driven truck
‘ The ‘exceptional efficiency of this system is the result
adapted to carry excavated material, said truck being
of several unique advantages, not the least of which
powered ‘by a plurality of electric motors mounted in a
is that each of the trucks 38 can haul perhaps 20 to 30
respective plurality of the truck wheels, trolley follow
percent more excavated material than can conventional 45 ing means on said truck for collecting su?icient power
‘diesel trucks. Combined with this is the fact that the
trucks 38 can ascend the roadway out of the pit at a much
faster speed than was ever possible with diesel trucks.
from said trolley wires to permit high-speed operation
of said truck on said roadway, and an electric genera
tor powered by an internal combustion engine mounted
in said truck for producing sufficient power to‘ permit
‘Moreover, notwithstanding the increased speed and load
‘of'the trucks 3-8, they are su?iciently powerful to per 50 low-speed operation of said truck independently of said
mit the roadway 19 to be inclined at the extraordinary
trolley, whereby said truck is driven at low speed be
‘grade of about 15 percent, which means that the length
tween the loading area and lower terminus and the dump
of the roadway 19 is much shorter for a given vertical
ing area and upper terminus of the roadway and at high
speed on the roadway itself.
rise. In addition, unlike diesel trucks, the trucks 38 are
assured of operating on the roadway 19 up to their full 55
3. A haulage system for transporting excavated mate
potential horsepower rating regardless of the elevation
rial from an open pit mine or the like comprising a
loading station on the ?oor of said pit and a dumping
station outside of said pit, an inclined roadway slop
ing upwardly from a- lower terminus on the floor of said
tem is obvious since truck drivers are not required to 60 pit removed from said loading area to an upper terminus
drive the trucks during the long ascent and descent on
outside of said pit removed from said dumping area,
the roadway 19‘.
'
a plurality of towers spaced alongside said roadway
These advantages of the new haulage system are
from the lower to the upper terminus thereof, trolley
above sea-level of the mine, since a rare?ed atmosphere
has little adverse effect on electric motors. Also, the
saving in personnel costs made possible by the new sys
wires suspended from said towers above said roadway
achieved, however, without in any way interfering with
the normal excavating operations on the door of the mine 65 substantially throughout its length, a source of electrical
pit or the dumping operations outside the pit. As noted
power connected to said trolley wires for delivering elec
above, the lower terminus 20 of the roadway 19 is re
tric current thereto, at least one electrically driven
moved from the loading area 15 so that the trolley wires
truck adapted to carry excavated material, said truck
29 and Z9’ and the towers 23 do not hinder the shovel
being powered by a plurality of electric motors mounted
13 and other excavating equipment in their work. This 70 in a respective plurality of the truck wheels, electro
is made possible by the incorporation in the trucks 38 of
the auxiliary diesel-driven generator which permits the
trucks to be operated, even when fully loaded, completely
independently of the ‘trolley cables. Also, it means that
at the dumping area 17 outside of the ‘pit, the trucks 38 75
dynamic braking means provided by said electric motors
‘for braking said truck during its downward travel on
said roadway, and resistance means on said truck for
dissipating electrical energy generated by said braking
means, trolley following means on said truck for col
3203011982
'lcctingsu?icient power from said trolley wires to permit
‘high-speed operation of said truck on said roadway,
and an electric generator powered by an internal com
bustion engine mounted in said truck for producing suffi
cient power to permit low'speed operation of said truck
independently of said trolley, whereby said truck is driven
at low speed between the loading area and lower ter
minus and the dumping area and upper terminus of the
roadway and at high speed on the roadway itself.
5%
dumping area, one of said lanes being used for ascending
trailic and the other for descending tra?ic, a plurality of
portable towers spaced alongside said roadway from the
lower to the upper terminus thereof, two pairs of trolley
wires suspended from said towers longitudinally above the
respective lanes of said roadway throughout substantially
their entire length, a source of electrical power for passing
current through each pair of trolley wires, stationary
signal-transmitting means extending substantially centrally
4. A haulage system for transporting excavated mate 10 throughout the length of each lane of said roadway, ener
gizing means for activating said signal-transmitting means,
a plurality of trucks of high load capacity adapted to carry
excavated material, each of said trucks being powered
station outside of said pit, an inclined roadway sloping
by a plurality of electric motors mounted ‘in a respective
upwardly from a lower terminus on the ?oor of said
plurality of the truck wheels, trolley following means on
pit removed from said loading area to an upper ter
each truck for delivering su?icient power from said
minus outside of said pit removed from said dumping
trolley ‘wires to its electric motors to permit high-speed
area, a plurality of towers spaced alongside said roadway
operation of said trucks on said roadway, sensing means
from the lower to the upper terminus thereof, trolley
on each of said trucks for receiving the transmitting means
wires suspended from said towers above said roadway
substantially throughout its length, a source of electrical 20 signal in one of said lanes, direction-changing means in
each truck responsive to said sensing means for steering
power connected to said trolley wires for delivering elec
said trucks along the guiding means in one of said lanes,
tric current thereto, at least one electrically driven truck
and an electric generator powered by a diesel motor
adapted to carry excavated material, trolley following
mounted in each truck for delivering suf?cient power
means on said truck for collecting su?icient power from
to its electric motors to permit low-speed operation of
v‘said trolley Wires to permit high-speed operation of '
said trucks independent of said trolley wires, whereby
said truck on said roadway, guiding means for auto
said trucks are driven at low speed by an operator between
matically steering said truck as'it travels over said road
the loading area and lower terminus and the dumping area
way, and an electric generator powered by an internal
and upper terminus of the roadway and at high speed
rial from an open pit mine or the like comprising a
loading station on the ?oor of said pit and a dumping
combustion engine mounted in said truck for producing
an operator on said roadway.
sufficient power to permitlow-speed operation of said 30 ‘without
7. A haulage system for transporting excavated material
(truck independently of said trolley, whereby said truck
from an open pit mine comprising a loading station on
is driven at low speed between the loading area and lower
terminus and the dumping area and upper terminus of
‘the roadway and at high speed without an operator on
the floor of said pit and a dumping station outside of
said pit, an inclined double-lane roadway sloping a consid
35 erable distance upwardly from a lower terminus on the
the roadway itself.
?oor of said .pit removed from said loading area to an
5. A haulage system for transporting excavated mate
upper terminus outside of said pit removed from said
rial from an open pit mine comprising a loading station
dumping area, one of said lanes being used for ascending
tra?ic
and the other for descending tra?‘ic, a plurality of
said pit, an inclined roadway sloping upwardly from
portable towers spaced alongside said roadway from the
a lower terminus on the ?oor of said pit removed from 40 lower to the upper terminus thereof, two pairs of trolley
‘said loading area to an upper terminus outside of said
wires suspended from said towers longitudinally above
pit removed from said dumping area, a plurality of
the respective lanes of said roadway throughout substan
towers spaced alongside said roadway from the lower
tially their entire length, a source of electrical power for
to the upper terminus thereof, a pair of trolley wires sus
passing current through each pair of trolley wires, sta
pended from said towers above said roadway through
tionary
signal-transmitting means extending substantially
out substantially its entire length, a source of electrical
centrally throughout the entire length of each lane of said
power for passing current through said trolley wires,
roadway, energizing means for activating said signal-trans
signal-transmitting means extending continuously through
mitting means, a plurality of tracks of high load capacity
out the entire length of said roadway, energizing means
adapted to carry excavated material, each of said trucks
50
for activating said signal-transmitting means, at least
being powered by a plurality of electric motors mounted
vone truck of high load capacity adapted to carry ex
in the respective truck wheels, trolley following means on
cavated material, said truck being powered by a plurality
each truck for delivering su?icient power from said trolley
of electric motors mounted in a respective plurality of
wires to its electric motors to permit high-speed operation
the truck wheels, trolley following means on said truck
of said trucks on said roadway, sensing means on each of
for delivering suthcient power from said trolley wires to
said trucks for receiving the transmitting means signal in
said electric motors to permit high-speed operation of
one of said lanes, direction-changing means in each truck
said truck on said roadway, sensing means on said truck
responsive
to said sensing means for steering said trucks
for receiving the transmitting means signal, direction
along the guiding means in one of said lanes, electro-dy
changing means in said truck responsive to said sens
braking means provided by each electric motor in
ing means for steering said truck along said roadway, 60 namic
each of said trucks which brakes the trucks during their
and an electric generator powered by an internal corn
downward travel on the descending lane of said roadway,
bustion engine mounted in said truck for delivering suffi
and an electric generator powered by a diesel motor
cient power to said electric motors to permit low-s ee
mounted in each truck for delivering su?icient power to
operation of said trucl-z independent of said trolley wires,
electric motors to permit low-speed operation of said
whereby said truck is driven at low speed by an operator 65 its
trucks independent of said trolley cables, whereby said
between the loading area and lower terminus and the
trucks are driven at low speed by an operator between the
dumping area and upper terminus of the roadway and at
loading area and lower terminus and the dumping area
high speed without an operator on the roadway itself.
and upper terminus of the roadway and at high speed
6. A haulage system for transporting excavated mate
rial from an open pit mine comprising a loading station 70 without an operator on the ascending and descending lanes
of said roadway.
on the ?oor of said pit and a dumping station outside
8. A haulage system for transporting excavated mate
of said pit, an inclined double-lane roadway sloping a
rial from an open pit mine comprising a loading station on
considerable distance upwardly from a lower terminus on
the ?oor of said pit and a dumping station outside of said
the floor of said pit removed from said loading area to an
“upper terminus outside of said pit removed from said 75 pit, an inclined double~lane roadway sloping a consider
‘on ‘the floor of said pit and a dumping station outside of
3,080,982
able distance upwardly from a lower terminus on the ?oor
of said pit removed from said loading area to an upper
terminus outside of said pit removed from said dumping
area, one of said lanes being used 'for ascending trailic
and the other for descending tra?‘ic, a plurality of portable
towers spaced alongside said roadway from the lower to
the upper terminus thereof, two pairs of trolley wires sus
pended from said towers longitudinally above the re
spective lanes of said roadway throughout substantially
10
for dissipating whatever electrical power generated by
said braking means is not used by said ascending trucks,
and a direct current generator powered by a diesel motor
mounted in each truck for delivering su?icient power to its
electric motors to permit low-speed operation of said
trucks independent of said trolley wires, whereby said
trucks are driven at low speed by an operator between the
loading area and lower terminus and the dumping area
‘and upper terminus of the roadway and at high speed
their entire length, a source of electrical power for passing 10 without an operator on the ascending and descending lanes
direct current through each pair of trolley wires, a signal
transmitting guiding cable buried beneath each lane of
of said roadway.
said roadway extending substantially centrally throughout
References Cited in the ?le of this patent
its entire length, energizing means for activating each
’
UNITED STATES PATENTS
guiding cable, a plurality of multi-wheel trucks of high 15
458,665
Seymour ____________ __ Sept. 1, 1891
load capacity adapted to carry excavated material, each of
714,157
Davis _.._..; _________ _.. Nov. 25, 1902
said trucks being powered by a plurality of direct current
729,826
Willard ______________ _.. June, 2, 1903
motors mounted in its respective truck wheels, a pair of
873,703
Anderson ______ ___.._......__ Dec. 17, 1907
pivotable trolley poles on each truck for following one of,
Paulus et al ___________ _.. Apr. 27, 1943
said pairs of trolley wires and delivering sufficient power 20 2,317,400
2,339,291
Paulus ___‘ ___________ __ Jan. 18, 1944
from said trolley wires to said electric motors to permit
2,600,320
Potter __________ _'_____ June 10, 1952
high-speed operation of said trucks on said roadway, sens
2,733,770
.LeTourneau __________ __ Feb. 7, 1955
ing means on each of said trucks for receiving the signal
2,742,099
Hagen ______________ .._ Apr. 17,1956
transmitted by the guiding cable buried in one of said
LeTourn'eau __________ __ Sept. 18, 1956
lanes, direction-changing means in each truck responsive 25 2,763,331
to said sensing means for steering said trucks along the
‘
FOREIGN PATENTS
guiding cable in one of said lanes, electro~dynarnic braking
347,705
Great
Britain ________ _._ Apr. 28, 1931
means provided by each electric motor in each of said
trucks which brakes the trucks during their downward
OTHER REFERENCES
travel on the descending lane of said roadway and which is 30 Mining Engineering, pages 405408, April 1959.
adapted to return electrical power to said trolley wires for
use by the ascending trucks, resistance means on said truck
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