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Патент USA US3049270

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Aug. 14, 1962
G. k. DEMPSTER ETAL
3,049,254
FRONT END LOADERS
Filed March 10, 1958
3 Sheets-Sheet 1
20
1-:
INVENTORS
GEORGE E. DEMPSTE'R
WILL/AM A. HERP/CH
BY
M flaw;
ATTORNEYS
Aug. 14, 1962
e. R. DEMPSTER ETAL
3,049,254
FRONT END LOADERS
Filed March 10, 1958
3 Sheets-Sheet 2
INVENTORS
: 2!
l4
GEORGE R_. DEMPSTER
WILL/AM A. HERP/C‘H
Aug. 14, 1962
G. R. DEMPSTER EI‘AL
3,049,254
FRONT END LOADERS
Filed March 10, 1958
r
3 Sheets-Sheet 3
INVENTORS
GEORGE R.. DEMPSTER.
W/LL/AM
.4. HERP/CH
311% ‘than;
ATTORNEYS” l
nits
3,049,251.?
by Era
Patented Aug. 14, 1962
2
1
FIG. 2 is a partial top plan view of the container;
3,049,254
FRONT ENDVLOADERS
FIG. 3 is a partial end elevation thereof;
FIG. 4 is a diagrammatic top plan view of a portion
of the front end loader and container in positions sepa
rated from each other and before movement into engage
ment;
FIG. 5 is a similar view, showing the lifting arms par—
tially engaged with the container and the brackets thereof
in positions where they initially engage the partially open
George R. Dempster and William A. Herpich, Knoxville,
Tenn.; said Herpieh assignor to Dempster Brothers,
Inc., Knoxville, Tenn., a corporation of Tennessee
Filed Mar. 10, 1958, Ser. No. 720,441
9 Claims. (Cl. 214-302)
This invention relates to improvements in front end
loaders of the character used for picking up containers
at the front of a motor vehicle and dumping the contents 1O
therefrom into the body of the vehicle.
It has been proposed heretofore that dumping equip
doors;
FIG. 6 is a similar view, with the parts in full engage
ment;
FIG. 7 is a side elevation of one of the pick-up arms,
ment be mounted on a motor vehicle having a refuse
with parts in section; and
body with a device mounted on the front portion of the
FIG. 8 is a top plan view thereof, showing a portion
vehicle adapted for engagement selectively with con 15 of the container.
tainers which may be approached at the front of the
The invention is shown as applied to a motor vehicle of
vehicle for picking up a container automatically and
conventional form, merely as an example of the type of
lifting the container over the front portion of the vehicle
vehicle on which this loading device may be used. It
and for dumping the contents into the body.
has been customary heretofore to utilize a vehicle chassis
Such containers are frequently provided with ?lling
of the character generally indicated by the numeral 1
doors on the ends thereof, hinged for swinging movement
and which is self-propelled under control of an operator
toward and from the end walls of the containers. While
on road mounted wheels, such as the front and rear wheels
provisions are often made for latching the doors closed,
indicated generally at 2 and 3. The cab is shown at 4
these are frequently left open, swinging out away from
within which the operator is located.
25
the end walls.
A refuse body is shown at 6. This may be any suitable
Inasmuch as the lifting arms pick up the container and
type of body adapted to receive refuse therein, such as
raise it to an elevated position over the refuse body for
garbage, trash and the like, and may be of the character
dumping, the free outward swinging of the ?lling doors on
that is provided with packer means to compress the refuse
the end ‘walls would interfere with the dumping of the
as it is deposited in the body. It is preferred that a body
30
container. Consequently, it is very desirable that the
be used of the type having a ?lling opening or hopper,
end wall doors be closed during the dumping action, but
indicated at 7, in the top near the front, through which
this would require the operator to leave the cab of the
the refuse may be deposited into the body. The character
vehicle and to walk around the container for manually
of the body otherwise may be varied as desired.
closing the doors. Such a practice would materially
Referring ?rst to the form of the invention illustrated
delay the dumping action and make the dumping of the 35 in FIGS. 1 to 6, the loader structure comprises a pair of
container very time-consuming.
lifting arms 8 spaced apart a distance substantially corre
One object of this invention is to overcome the fore
going objections and to improve the construction of the
sponding with the width of the cab 4. These arms 8 are
preferably of gooseneck shape or of inverted U-shape,
front end loaders and containers used therewith.
so as to extend over the top and downwardly in front and
Another object of the invention is to provide for the
back of the cab 4 at the front portion of the truck, sub
automatic closing of the end Wall ?lling doors on the con
stantially as illustrated in FIGS. 1 and 4 to 6. The arms
tainer by the lifting arms of the front end loader, with
should clear the cab fully, but the dimensions of the
out requiring manual action of the operator and to insure
arms should be kept as reasonably close as practicable to
that the doors would not interfere with the dumping 45 the sides and top of the cab. Each of the arms may be
action.
formed of fabricated structure, either square or round in
Still another object of the invention is to provide means
cross section and preferably tubular, for sufficient strength
on the end wall doors of the container in positions for
and rigidity and yet lightness in weight, as desired.
cooperative relation with the pick-up arms or portions
The arms 8 extend downward at the back of the cab 4,
thereof, so as to close the doors and to hold these closed
with their lower ends ?xed on a torque tube 9 extending
during the dumping action.
transversely of the vehicle and suitably journaled on the
chassis frame 1. Hydraulic power devices, generally indi
These objects may be accomplished, according to one
cated at :10, are operatively connected 'with the arms 8
embodiment of the invention, by providing contact plates
for swinging the latter to different positions, some of
on the end wall doors in positions for cooperative action
with door-closing brackets on the pick-up arms, so that 55 which are indicated by dotted lines in FIG. 1.
At the forward end of each lifting arm 8 is a pick-up
when the arms move into supporting relation with the
arm 11 extending forwardly of the vehicle from the outer
container, the doors are closed by the engagement of the
end of the lifting arm 8 and mounted on a torque tube
brackets with the contact plates and are held closed
12 extending therebetween, as illustrated more in detail
thereby during the dumping operation. The brackets
move into engagement with the contact plates on the 60 in FIGS. 7 and 8. Suitable means may be used for
manipulating the pick-up arms '11, such, for example, as
doors, frictoinally bearing against the latter and thereby
hydraulic power devices 13, as described more in detail
swinging the doors closed. The hinged edge of each
in
our prior application, Serial No. 662,252, ?led May
door should be in a direction toward the side of the
28, 1957. The outer end of each pick-up arm 11 is pro
container that will face toward the vehicle during the
vided with a retainer 14 for insuring connection with the
loading operation, whereby the frictional engagement will 65 container.
be su?icient to force the doors closed.
'
A container is indicated generally at 15 and may be of
This embodiment of the invention is illustrated in the
any suitable or desired size and shape for receiving and
accompanying drawings, in which:
containing refuse and the like. Such containers usually
are provided with fork sleeves or channels, generally in
loader and container in which the present invention is 70 dicated at 16 on the end walls thereof, open at opposite
FIG. 1 is a diagrammatic side elevation of a front end
used;
_. ends and adapted to receive the pick-up arms 11 there
3,049,254
-
4
3
through, as will be apparent from FIGS. 1 and 7. Each
pick-up arm 11 is preferably tapered lengthwise, as illus
trated in FIG. 7, to allow a tolerance in the alignment
of the forks and still permit insertion into the fork sleeves
or channels 16. The tapered relation will also permit of
a greater dumping angle when the container is turned up
side down and has come to rest on the tapered arm.
the fork arms 11. This dumping action will be apparent
from the dotted line positions illustrated in FIG. 1 and
has been described more in detail in the above-mentioned
patent application, Serial No. 662,252, ?led May 28,
1957, to which reference may be made for a more com
plete description thereof.
During the dumping action, the lugs 14 on the ends of
the fork arms 11 engage the ends of the channels or sleeves
The container 15 may be provided either with an open
16 so as to keep the container securely locked in position
top or with suitable doors therein which may be opened
for dumping of the contents, as described more in detail 10 on these arms against the possibility of becoming disen
gaged therefrom when turned to an upside down position.
in our application mentioned above.
Thus, the container cannot become separated acciden~
The container 15 is usually provided with doors 17 on
tally from the fork arms, but will be retained effectively
the end walls thereof, hinged at 18 to the body of the
thereon as it is moved to and from its dumping position.
container and having latch means 19 for holding the doors
While the invention has been illustrated and described
closed. These doors 17 may be opened for ?lling and 15
in one embodiment, it is recognized that variations and
should be latched closed at other times, but are frequently
changes may be made therein without departing from the
left open. In the event that the doors are open when
the loader unit moves into pick-up relation with the con
tainer, provision is made, according to this invention, for
closing the doors and holding them closed during the
dumping operation.
This is accomplished by providing a contact plate,
indicated at 20, on each door 17, and projecting out at an
angle to the face thereof which is tapered, as shown at 29
in FIG. 2. The outward taper should extend in the di
rection away from the hinged edge of the door. The con
tact plate 26 is located on the door in a position to be en
invention as set forth in the claims.
We claim:
1. In a front end loader of the character described, the
combination with a motor vehicle having a loader unit
mounted thereon including a pair of fork arms, of a con
tainer having end connections in positions for engagement
by the fork arms for lifting the container to an elevated
position relative to the motor vehicle, a door on an end
of the container mounted for opening movement, and
means on at least one of the fork arms for closing the
door when the fork varms are moved into substantial en
gaged by a door closing bracket 21 carried on the adja
gagement with the end connections before raising of the
cent pick-up arm 11, such, for example, as immediately
30 container to said elevated position and for holding the
above the adjacent channel or sleeve 16.
door closed as long as the fork arms remain in substantial
The door closing bracket 21 may be formed integral
engagement with the end connections.
with the pick-up or fork arm 11, or rigidly secured thereto,
2. In a front end loader of the character described, the
extending upward and forward from the arm 11 suffi
combination with a motor vehicle having a loader unit
into engagement with the contact plate 20 if the door 17 35 mounted thereon including a pair of fork arms, of a con
tainer having end connections in positions for engage
should be open. The bracket 21 is elongated in a direc
ment with the fork arms for lifting the container to an
tion lengthwise of the arm 11 and substantially parallel
elevated position relative to the motor vehicle, a door
therewith and may have a forwardly de?ected end por
hinged to an end of the container at an edge of the door
tion 22 thereon, if desired, as shown in FIG. 8, to fa
cilitate engagement with the contact plate 2!} and the 40 toward the motor vehicle, and means on the fork arms
for closing the door when the fork arms are moved into
smooth closing of the door thereby.
engagement with the end connections.
The end wall doors 17 should be hinged at 18 toward
3. In a front end loader of the character described, the
the rear wall of the container when turned in a position
combination with a motor vehicle having a loader unit
toward the front of the veln'cle, as viewed in FIG. 1.
mounted thereon including a pair of fork arms, of a con
This will insure that the movement of the pick-up or fork
tainer having end connections in positions for engagement
arms 11 toward engagement with the channels or sleeves
with the fork arms for lifting the container to an elevated
16 will be in a direction that will insure the closing of the
position relative to the motor vehicle, a door hinged to
doors. The rear wall of the container may be provided
the container at an edge of the door toward the motor
also, if desired, with a scuff plate, indicated at 23, on the
wall of the container in position for engagement by the 50 vehicle, and means connected with the fork arms in a
position for closing engagement with the door when the
torquetube 12 as the loader unit moves into engagement
fork arms ‘are moved substantially into operative engage
with the container. This affords added bearing surface
ment with the end connections.
and prevents wear on the rear wall of the containerrdue
4. In a front end loader of the character described, the
to engagement with the torque tube therewith.
The action of the device is- illustrated diagrammati 55 combination with a motor vehicle having a loader unit
mounted thereon including a pair of fork arms, of a con
cally in FIGS. 4, 5 and 6. FIG. 4 shows the loader unit
tainer having end connections in positions for engage
approaching the container 15, with the pick-up arms ‘11
ment with the fork arms for lifting the container to an
lowered substantially to positions for alignment with the
elevated position relative to the motor vehicle, a door
fork sleeves or channels 16. The doors 17 are open. The
hinged to the container at an edge of the door toward
contact plates 20 on the doors are in positions to be en
the motor vehicle, said door having a contact plate
gaged by the brackets 21 as the fork arms 11 move into
ciently to clear the channel or sleeve 16 and yet to move
the channels or sleeves 16.
The latter position is illustrated in FIG. 5, where the
doors 17 are shown as having been moved from the posi~
thereon, and a bracket connected with one of the fork
arms in position for engagement with the contact plate
when the door is ‘open for moving the door to a closed
tion shown in FIG. 4 to partially closed positions by the 65 position with respect thereto.
5. A container for a front end loader having end con
action of the brackets 21 engaging, the contact plates 20.
nections adapted for engagement by a loader unit, said
The continued movement into fully engaged‘ position is
container having a door movably mounted thereon adapt
illustrated in FIG. 6, in which the torque tube 12 is bear
ed for movement to» an open position, and a contact plate
ing against the scuff plate 23 and the door closing brackets
21 have pushed the doors to fully closed positions. The 70 on the door and protruding outwardly therefrom in posi
tion‘ to be slidably engaged and pushed inwardly with
container is now ready to be picked up by the loader unit
respect to the container'by the loader unit. when the latter
and dumped.
1
The dumping action is accomplished by the operation
moves substantially into engagement with the end con
nections of the. container, said plate serving to push the
of the hydraulic power devices 10 which also control the
raising and lowering and positions of the arms 8 and. of 75 door closed and to hold the door closed as long as the
.1.
3,049,254
5
6
loader unit is in substantial engagement with the end
connections.
the container at an edge of the door toward the motor
vehicle, and a door-closing bracket connected with one
of the fork arms in the path of the door upon movement
of the fork arms into engagement with the end ‘connec
tions for closing the door relative to the container.
9. A ‘container for a front end loader comprising a
6. A container for a front end loader having end con
nections adapted for engagement by a loader unit, said
container having a door movably mounted thereon adapt
ed for movement to an open position, and a contact plate
on the door and protruding outwardly therefrom adjacent
the end connections in position to be slidably engaged and
body portion having sides and opposite ends, connections
on the ends adapted for engagement by a loader unit, a
door ‘at one end hinged thereto about an upright axis and
loader unit when the latter moves substantially into en 10 adapted to swing open in a direction toward said loader
gagement with the end connections of the container for
unit, and a contact plate having the shape of a wedge and
moving the door to a closed position relative to the con
extending outwardly from the door adjacent the end con
tainer and for holding the door closed as long as the
nection in position for engagement by the loader unit when
loader unit remains in substantial engagement with the
the latter moves substantially into engagement with the
end connections.
15 end connections of the container for moving the door to
7. A container for a front end loader having lifting
a closed position relative to the container.
members on opposite ends thereof for engagement by a
loader unit, said container having a door hinged about an
References Cited in the ?le of this patent
upright axis on one of said ends adjacent the lifting mem
UNITED STATES PATENTS
ber thereof adapted for movement to an open position, 20
and a contact member extending outwardly from the door
1,320,350
Summers _____________ __ Oct. 28, 1919
pushed inwardly with respect to the container by the
adjacent the end connection in position for engagement by
the loader unit when the latter moves substantially into
engagement with the lifting member for moving the door
to a closed position relative to the container.
8. In a front end loader of the character described, the
combination with a motor vehicle having a loader unit
mounted thereon including a pair of fork arms, of a con
tainer having end connections in positions for engagement
with the fork arms for lifting the container to an elevated 30
position relative to the motor vehicle, a door hinged to
2,135,890
2,256,453
2,624,478
2,670,865
2,679,326
2,698,696
Gedge ________________ __ Nov. 8,
Bomar ______________ __ Sept. 16,
Kaplan _______________ __ Jan. 6,
Merrick ______________ __ Mar. 2,
Isaksen ______________ __ May 25,
Strong ________________ __ Ian. 4,
1938
1941
1953
1954
1954
1955
2,702,142
2,732,087
2,808,161
2,824,658
Jones ________________ _._ Feb. 15,
Pratt _________________ __ Jan. 24,
Gentile _______________ _._ Oct. 1,
Beasley ______________ __ Feb. 25,
1955
1956
1957
1958
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