U.S. patent number 3,719,296 [Application Number 05/075,633] was granted by the patent office on 1973-03-06 for load handling container apparatus.
Invention is credited to Eric M. Larson, Jr..
United States Patent |
3,719,296 |
Larson, Jr. |
March 6, 1973 |
LOAD HANDLING CONTAINER APPARATUS
Abstract
Load handling apparatus particularly operative in a municipality
trash collecting operation, servicing domestic and/or industrial
sectors of a community. The load handling apparatus, in trash or
waste collecting form, includes a plurality of trash containers
adapted to be positioned each at a strategic trash pick-up
location. Each of the containers are provided with drop bottom wall
means and spring-loaded dog latch means releasably holding the drop
bottom wall in closed configuration. The load handling apparatus
may include also a portable crane unit and container lifting
grapple means dependingly supported on the boom means of the crane
unit.
Inventors: |
Larson, Jr.; Eric M. (Coral
Gables, FL) |
Family
ID: |
22127045 |
Appl.
No.: |
05/075,633 |
Filed: |
September 25, 1970 |
Current U.S.
Class: |
414/422;
294/68.21; 294/86.41; 414/739; 294/68.3; 414/735 |
Current CPC
Class: |
B66C
1/663 (20130101); B65F 1/125 (20130101); B65D
90/623 (20130101) |
Current International
Class: |
B65D
90/00 (20060101); B65D 90/62 (20060101); B66C
1/62 (20060101); B65F 1/12 (20060101); B66C
1/66 (20060101); B66f 009/00 () |
Field of
Search: |
;214/300,302,307,315,653,147G ;294/69R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Forlenza; Gerald M.
Assistant Examiner: Oresky; Lawrence J.
Claims
What is claimed is:
1. Load handling apparatus particularly for use in a waste
collecting and disposal service comprising portable crane means
having boom means and a liftable, slewable work load element
supported from said boom means, a container for receiving waste
material or the like including body means, including side wall
means defining a circumferential enclosure, bottom wall means, and
hinge means supporting said bottom wall means from said enclosure
and affording movement of said bottom wall means between a raised
configuration disposed across the lower interior of said
circumferential enclosure, and a dropped configuration free of the
enclosure lower interior, latch dog means operative for holding
said bottom wall means in a raised configuration and trip means
selectively operative for releasing said dog means; and means
operative in releasably supporting said container body from said
work load element of said crane means including a grapple assembly
dependingly supported from said work load element of said crane
means, including frame means, opposingly arranged lift jaw means
operatively supported from said frame means and defining left and
right depending jaw elements operative between convergingly closed
and divergingly open positions, including power means selectively
controllable and operative for arranging said jaw elements in
closed or open positions, and including cooperative separable hook
and rail lift hitch means supported respectively on said container
body and said pair of lift jaw elements and operative in releasably
lifting said container body; said separable hook and rail lift
hitch means includes a pair of lift rail members supported each on
opposite side wall portions of said circumferential enclosure of
said container body and arranged generally horizontally coplanar
and parallel, and includes lift hook means supported respectively
on said pair of jaw elements and operatively convergingly engaging
or divergingly disengaging the pair of lift rail members in
releasably lifting the container means; the drop bottom wall means
of said container body is a single wall form, wherein the hinge
means of said container structure is arranged between the left
margin of said bottom wall means and a lower margin of the left
side wall means of said circumferential enclosure, and wherein said
latch dog means is operatively supported along the lower margin of
the wall means of said circumferential enclosure, said latch dog
means being releasably engageable with that edge portion of said
bottom wall means opposite from said hinge means; said trip means
for releasing said dog means includes a horizontal trip release rod
element, means guidingly constraining said rod element in vertical
movement along the outward upper margin of the right wall structure
of said circumferential enclosure, and includes linkage means
operably connecting the latch dog means and said trip release rod
element; and includes trigger means supported on said grapple
assembly operative for actuating said trip release rod element;
said trigger means includes a trigger element, means operably
mounting said trigger element on said right jaw means, said trigger
element being movable inwardly and outwardly of said right wall of
said container body respectively upon converging diverging movement
of said lift jaw means, means guidingly constraining said trigger
element in bidirectional vertical movement and in a disposition for
engaging and disengaging said trip release bar element when said
grapple assembly is arranged operably superjacently of said
container and when said lift hook means of said grapple assembly
are contiguous to the lift rail means of said container, and
including power means connected with said trigger element and
selectively operative for actuating said trip release rod element
and thus the dog latch means of the container drop bottom wall.
2. Load handling apparatus as set forth in claim 1 wherein said
linkage means connecting said latch dog means and the vertically
operative trip release rod element affords release movement of said
latch dog means upon upward movement of said trip release rod,
wherein said trigger element is arranged subjacently of said trip
release rod when said grapple assembly is supported superjacently
of said container and when the left and right jaw means are in
converged disposition, wherein said release rod element is
operative in upward movement, engaging and raising the trip release
rod, releasing the latch dog means and permitting gravity drop
opening of the container bottom wall.
3. Load handling apparatus as set forth in claim 1 wherein said
means guidingly constraining said trigger element in bidirectional
movement, and the power means operating said trigger element
include common and simultaneously operative structure, and includes
a hydraulic piston-cylinder assembly arranged generally vertically
and having a base end mounted from said frame means of said grapple
assembly, and wherein said trigger element is generally
perpendicularly mounted to the distal extension of the piston of
said piston-cylinder assembly.
4. Load handling apparatus as set forth in claim 3 wherein said
left and right jaw elements are generally dependingly pivotally
supported in converging and diverging movement and wherein said
piston-cylinder assembly of said trigger means is articulatingly
mounted at its base end to the right jaw means of said grapple
assembly, permitting the piston-cylinder assembly and thus the
trigger element to operably dependingly pivot relative to the
pivotally mounted right jaw means of the grapple assembly.
5. Load handling apparatus as set forth in claim 4 wherein said
left and right jaw means of said grapple assembly includes
respectively a left pair and a right pair of jaw elements
supporting respectively left and right pairs of lift hook means
adapted for detachable engagement respectively with the left and
right horizontal lift rails supported on opposite sides of said
container body.
6. Load handling apparatus as set forth in claim 1 wherein the
means dependingly supporting said grapple assembly from the work
element of said crane means includes rotator means turnably
mounting said grapple assembly from said load element, and
selectively operative power means for energizing said rotator means
and for turnably positioning the grapple assembly.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
Relates to load handling container apparatus generally and
particularly relates to container load collecting systems, as for
example in trash pick-up and disposal services of a
municipality.
2. Description of the Prior Art
The prevailing trend in waste disposal is toward the container box
collection system, and wherein a multiplicity of container boxes
are spotted for waste pick-up service at strategic geographic areas
and a single container box may receive the waste of one or more
dwellings or business establishments. In prior art practice, one
method of handling the waste pick-up container includes
hydraulically operative lift fork means mounted on a waste-haulage
vehicle. The individual containers are each provided with a pair of
sleeve or socket means for receiving the container lift fork means
of the waste haulage vehicle. In he prior art pick-up procedure,
the container boxes each are lifted and overturned to pour the
waste contents thereof into the load body of the haulage vehicle. A
particular drawback in such an operation is the expense involved.
As may well be appreciated, the heavy haulage vehicles equipped
with fork lift means are expensive in first cost outlay, and in
maintenance and repair procedure. A further disadvantage is in the
flexibility or maneuverability of the large haulage vehicles; the
large size of the vehicle particularly presents problems in waste
pick-up procedure where the container boxes are located in narrow
or confined areas providing insufficient space for maneuvering the
haulage vehicle unit.
In certain communities, trash or waste is piled on the ground and
is picked up by portable crane means having clam shell type lift
bucket means for lifting and transferring the waste material from
the ground to a haulage vehicle. As may well be appreciated, such
procedure is particularly undesirable in a number of ways: The
loose piles of trash along a thoroughfare is particularly offensive
in windy weather, the trash is blown about and strewn over the area
resulting in yet further litter and detracting from the neat
appearance of a community. The stacks or piles of loose waste
material also provide ideal breeding places for rats and flies and
present a health hazard to a community. Moreover, the use of a
portable crane and clam shell bucket for lifting and transferring
the waste material causes holes to be formed in the ground by the
clam shell jaws during the pick-up procedure and which results in
damage and unsightly holes in the landscape or community area.
SUMMARY OF THE INVENTION
The instant invention obviates many of the above-mentioned
difficulties associated in prior art load handling apparatus and
particularly in such apparatus operative in trash collecting and
disposal type operation. The equipment and operation of the waste
disposal means of the instant invention is substantially less
expensive than the prior art container box disposal means utilizing
fork lift heavy haulage compound vehicle means operative in lifting
and overhead dumping the waste material from the container box.
Moreover, the relatively compact configuration and mobile crane
type operation of the instant invention permits flexibility and
maneuverability in trash pick-up service and provides waste
handling equipment readily operative in pick-up and manipulation of
waste container means located in a narrow or confined work area.
And the use of container boxes in waste disposal is particularly
significant in maintaining healthful conditions and the
aesthetically pleasing appearance of a community.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an elevational view of the load handling apparatus of the
instant invention arranged in a trash pick-up configuration, and
with the mobile crane unit being in a disposition preparatory to
lifting a waste container unit;
FIG. 2 illustrates the load handling apparatus in a configuration
operably subsequent to the configuration shown in FIG. 1 and with
the container unit being in an elevated disposition over a haulage
vehicle H, as in the dumping of a waste load into the vehicle;
FIG. 3 is a perspective view of the container box means and the
box-lifting grapple jaw means of the invention, shown in engaged
relation; and
FIG. 4 is a vertical plane sectional view taken as on the line 4--4
of FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The load handling apparatus of the invention is indicated by
numeral 12 and preferably includes the following basic components:
a portable crane unit 14 having a liftable, slewable articulated
boom 16 defining, in this instance, a work load element 18 arranged
on the distal extremity of the boom; container box means 20
including a box body 22 including rectangular side wall means
defining a circumferential enclosure 24, including floor or bottom
wall means 26, and hinge means 28 hingedly supporting the bottom
wall to the lower margin edge of the circumferential enclosure 24,
latch dog means 30 for releasably securing the bottom wall in
closed disposition, and trip means 32 for releasing the latch dog
means. The load handling apparatus further includes a grapple
assembly 34 including frame means 36 and right and left
convergingly operative jaw means 38, 38'; hook and rail hitch
means, generally indicated 40, 42, adapted for releasably
supporting the container box means 20; and trigger means 44 adapted
for releasing the trip means 32 of the container means 20, in
releasing the drop bottom wall 26, in dumping a load of waste
material.
The circumferential enclosure 24 of the container box body 22 is of
rectangular upstanding configuration and includes parallel arranged
front and rear side walls 24f, 24r and parallel right and left side
walls 24', 24". The bottom wall 26 of the container body structure
22 is hingedly supported by hinge means 28 on the lower margin of
the left side wall 24" of the container enclosure structure 24.
Reinforcing angle iron corner members 46 preferably are provided on
the container box body, the rectangular upper and lower edge margin
portions of the circumferential enclosure 24 of the box body 22
also preferably are provided with reinforcing angle iron means 48,
50, extending in rectangular configuration about the upper and
lower openings of the container enclosure. The side wall means 24f,
24r, 24', 24" of the enclosure 24 each is preferably struck
inwardly in right angular section, defining a reinforcing
rectangular rib 52 arranged internally and at an intermediate level
of the box body enclosure structure. A pair of support struts 54',
54'; 54", 54" preferably are parallel fixedly secured respectively
on opposite side walls 24', 24"; the support struts 54', 54'; 54",
54" provide fixed mounting means respectively for the right and
left rail means 42', 42" respectively of the hook and rail hitch
means 40, 42 releasably engaging the grapple assembly 34 and
container means 20.
The container box means preferably is provided with hinged lid
panels 56', 56" hingedly connected on a common hinge axis 58
extending longitudinally, transversely medially of the box body.
The lid panels 56', 56" are adapted to restingly engage the
rectangular upper rim 48 of the box body enclosure; each or both
lid panels 56', 56" may be pivotally manipulated as indicated by
arrows 60 (FIG. 4) for gaining access to the container box
interior.
The grapple assembly frame 36 is of openwork form and
truncated-pyramid configuration in elevation. The frame 36
preferably includes a top plate portion 36t, a rectangular base
portion 36b and a plurality of obliquely radiating stringer members
36c rigidly interconnecting the frame top and base portions 36t,
36b. The grapple jaw means 38', 38" preferably includes a right
pair and left pair of jaw members respectively 38'f, 38'r; 38"f,
38"r pivotally supported respectively on opposite sides of the base
portion 36b of the grapple assembly frame 36. The bearing means
62', 62" pivotally support respectively the paired jaw members
38'f, 38'r, 38"f, 38"r respectively on parallel pivot axes and
provides for converging diverging movement of the depending lift
hook means 40'f, 40'r; 40"f, 40"r, adapted for engaging the
container lift rails respectively 42', 42". The right and left jaw
members 38'f, 38'r; 38"f, 38"r are each paid pivotally supported in
fixed vertical-pair arrangement respectively by jaw frame means
38'a, 38'b, 38' c; 38"a, 38"b, 38"c. The right lift jaw members
38'f, 38'r, for example, are rigidly fixed in vertical parallel
arrangement by frame structure bridgedly extending between the jaw
members 38'f, 38'r and include the horizontally extending parallel
bar and rod frame elements 38'a, 38'b and the pair of vertical
frame elements 38'c, 38'c interconnecting the horizontal members
38'a, 38'b.
The right and left jaw means 38', 38" include respectively
piston-cylinder assemblies 64', 64" operably connecting
respectively the paired jaw members 38'f, 38'r; 38"f, 38"r with the
grapple frame 36, and operative in converging diverging actuation
of the lift hook elements respectively 40'f, 40'r; 40"f, 40"r. The
base ends respectively of the right and left piston-cylinder
assemblies are pivotally secured respectively by horizontal
parallel pin means 64'a, 64"a, centrally to the underside of the
grapple frame upper plate structure 36t. The piston end portions
respectively of piston-cylinder assemblies 64', 64" are pivotally
secured by bearing means 64'b, 64"b arranged intermediate the
length respectively of the jaw frame elements 38'b, 38"b. The
piston-cylinder assemblies 64', 64" each are preferably of
double-acting type and hydraulically actuated. Hydraulic lines 66,
66; 68, 68 for the cylinder assemblies 64', 64" supply hydraulic
fluid from the mobile crane unit 14 and through appropriate control
valve means positioned in the crane unit. An operator seated in the
crane unit, by manipulation of the control valve means, may
selectively expand or contract the jaw means 38', 38" in the
engaging and disengaging of the hook elements 40'f, 40'r; 40"f,
40"r with respectively the rail means 42', 42" and in the lifting
and manipulation of the container structure.
The means for releasably lifting the container 20 by the work load
elements 18 of the boom means of the crane unit preferably includes
a hydraulic rotator unit 70 articulatingly pendantly connecting the
grapple assembly 34 with the work load element 18 of the crane
vehicle. The hydraulic rotator means includes a motor housing 70a
articulatingly connected through clevis means 70b to the load
element 18 of the crane boom structure, and includes a rotor
element 70c connected through clevis means 70d to the top plate
structure 36t of the grapple assembly frame 36. The rotator 70 is
energized through appropriate hydraulic feed line means (not shown)
extending along the boom structure 16 and to hydraulic pump means
carried in the crane vehicle. Suitable control valve means permits
an operator riding in the crane unit to selectively manipulate and
turnably position the hook means of the grapple assembly and/or the
engaged grapple and container means during the lifting and
manipulation of the container means.
The bottom wall means of the container is preferably of single wall
form and with the hinge means 28 being arranged externally of the
container interior and arranged along a side of the lower
rectangular rim portion 50 of the circumferential enclosure 22 of
the container. The bottom wall 26 preferably is fabricated from a
sheet metal panel 26a and rigidifying frame means including
rectangular angle iron structure 26b fixed about the periphery of
the sheet metal panel 26a, and a longitudinal member 26c fixedly
spanning the front and rear parallel frame elements of the
rectangular framing 26b. The container bottom wall 26 is swingable
between a horizontal disposition closing the lower interior of the
circumferential enclosure 22 (shown in full lines in FIG. 4) and an
open disposition (shown in broken lines in the Figure).
The bottom wall 26 preferably is provided with anti-friction runner
or roller means 72 adapted to engage the ground surface S as the
container is being lowered by the lowering of the work load element
18 of the crane unit; as the container moves downwardly, the roller
means 72 engages and rolls upon the ground surface, moving the
bottom wall to a closed latched disposition. The anti-friction
means 72 preferably includes a roller 72a fixedly journalled by
fork means 72b to the underside proximal edge of the bottom wall
structure. The container means 20 preferably is provided with
rising or skirt means, generally indicated 74, operative for
elevatingly spacing the container body 22 above the ground surface
S, providing space for accommodating the height of the roller means
72. Leg means 74a subjacently fixed to the lower rectangular rim 50
of the circumferential enclosure 24 preferably provides means for
elevatingly positioning the container body above the ground
surface. The relative height of the leg means 74a and the roller
means 72 is such to provide full closing and latching of the drop
bottom wall 26 as the container is lowered to a position resting on
the ground.
The latch dog means 30 preferably includes a plurality of dog
elements 30a fixedly secured in corresponding relation
intermittently on a shaft 30b horizontally journalled in bearing
means 30c. The plurality of latch dog elements 30a each includes a
barbed lower portion 30a' adapted to engage the proximal edge
portion 26b' of the bottom wall 26 of the container body 22. As the
bottom 26 is moved to a closed disposition, the plurality of barb
portions 30a' of the latch dog elements 30a pivotally shift
outwardly and inwardly to engage the undersurface of the angle iron
margin 26b' of the bottom wall, latching the wall in a closed
disposition. Helical spring and lever means 30d, 30e are arranged
on opposite end portions of the latch dog shaft means 30b, and
provide means for yieldably maintaining the barbed end portions
30a' in latched configuration with the container bottom wall.
The trip means 32, operative for releasing the dog means 30,
preferably includes a horizontal rod element 32a and means
generally indicated 32b, operative for guidingly constraining the
rod element 32a in vertical movement and for operably connecting or
linking the rod element to the latch dog means 30. The means 32b
preferably includes a lift bail assembly 32c including depending
leg portions 32d, 32d and upper structure defining the horizontal
rod element 32a; the bail assembly may include reinforcing means
32e of X-configuration rigidifying the leg portions 32d, 32d. The
lower extremities respectively of the leg portions 32d, 32d of the
bail assembly 32c are pivotally connected at pivot points 32f, 32f
to lever means 32g, 32g fixed parallel to the latch dog shaft means
30b. Lifting the trip assembly 32r pivotally moves the latch barbs
30a' outwardly, tensioning the latch springs 30d, and releases the
container bottom wall. The upper portions respectively of the leg
elements 32d, 32d preferably are guidingly constrained in slide
bearings 32h, 32h correspondingly fixed cantilever fashion to a
horizontal support member 32i fixed between the container strut
members 54', 54'.
The trigger means 44, operative for tripping the latch dog elements
30a, preferably is mounted on the right jaw means 38' of the
grapple assembly. The trigger mechanism 44 is bidirectionally
shiftable in response respectively to the expanding and contracting
movement of the lift jaw means 38', 38" of the grapple assembly.
The trigger mechanism preferably includes a piston-cylinder
assembly 44a, 44b vertically arranged and pendantly supported from
the horizontal frame member 38'a of the right lift jaw means 38'.
Pivot mounting means 44c pivotally supports the piston-cylinder
assembly 44a, 44b to the frame structure 38'a of the right jaw
means and in a disposition permitting generally free outward
swinging movement of the piston-cylinder assembly relative to the
right jaw means of the grapple assembly. A trigger element 44d is
fixed to the distal extremity of the piston 44a and is operative
for engaging and raising the latch release rod element 32a
supported on the container means. When the lift jaw means 38', 38"
are in a converged configuration, and as the lift hook elements
engage the lift rail means 42', 42" of the container means, the
trigger element 44d is arranged subjacently of the release rod
element 32a and in a disposition preparatory for tripping the latch
dog means.
Anti-rotation means 44e, 44f, 44g preferably is provided for
preventing relative rotation between the piston and cylinder
structure 44a, 44b and for preventing slewing movement and
displacement of the trigger element 44d from a disposition
transversely underlying the release rod element 32a. In the
anti-rotation structure, vertical rod means 44g is fixed to the
cylinder structure by bracket means 44e; the outward extremity of
the trigger element 44d provides bearing structure 44f slidably
receiving the stationary rod structure 44g. During vertical
actuation of the piston 44a, simultaneous sliding movement of the
bearing structure 44f on rod 44g prevents relative rotation of the
piston and cylinder structure and maintains the trigger element in
perpendicular arrangement relative to the release rod element 32a
when the container means and grapple assembly are in conjoined
operative configuration.
An abutment member 76h, which may be in channel form as shown, is
dependingly fixed to the horizontal jaw frame member 38'a and
provides abutment means for shifting the piston-cylinder assembly
44a, 44b and thus the trigger element 44d outwardly and away from
the trip release rod element 32a of the container means as the
grapple jaw means 34', 34" are moved to expanded configuration; the
abutment member 44r engages the cylinder structure 44b of the
piston-cylinder assembly and pivotally carries the cylinder
assembly and trigger element outwardly as the right jaw means 38'
is pivotally moved outwardly and as the jaw means are arranged in
expanded configuration.
During the pick-up of the container means 20, after the grapple
assembly 34 is lowered over the container means and the hook
elements are arranged on opposite sides of the container, inward
converging movement of the jaw means carries the trigger element
44d to a disposition subjacently of the trip release rod element
32a. Lifting the grapple assembly 34, engages the hook elements
40'f, 40'r, 40"f, 40"r respectively with the lift rails 42', 42"
(as shown in the drawings) and simultaneously raises the trigger
element 44d to a disposition contiguous to the undersurface of the
trip release rod element 32a. A hydraulic feedline 44i connects the
piston-cylinder assembly of the trigger mechanism to pressurized
control valve means carried in the crane vehicle, permitting an
operator in the vehicle to actuate the trigger mechanism and
release the drop bottom of the container.
Check rod means 76, 76 arranged on opposite end portions of the
container structure, provides means for limiting the gravity drip
opening of the container bottom wall 26 and for checking the bottom
wall to a disposition lying obliquely of the ground surface and a
disposition horizontally offset from the hinge axis of the bottom
wall; the inclined disposition of the bottom wall permits the
roller 72a to run along the ground surface and carry the bottom
wall to a closed configuration as the container is positioned on
the ground. Each check rod means 76 includes a rod element 76a
having a lower angle end portion 76b pivotally fitted respectively
in parallel opposite end angle iron frame means of the bottom wall.
The check rod elements 76a, 76a extend upwardly through slotted
openings 76c, 76c formed in the angle iron rim 50 of the container
enclosure 22; a cross portion 76d is fixed on the upper end of the
rod structure 76a; a helical compression spring 76e is convolutely
carried respectively on the rod elements 76a and interposedly
between the cross portions 76d and the rim structure 50 of the
container; the springs 76e cushion the gravity drop opening of the
container bottom. As the container bottom is moved to a closed
configuration, the rod elements 76a, 76a move upwardly in the
slotted openings and to stowed configuration respectively
juxtaposedly outwardly of the opposite end walls of the
container.
In the operation of the load handling apparatus 12, and considering
that trash material contained in the container means 20 is to be
deposited in haulage vehicle H, the following procedure may be
carried out: The crane 14 is piloted to a disposition convenient to
the container 20 or is spotted on the ground at a place whereat the
boom means 16 may be slewed to a position permitting the grapple
assembly 34 to be lowered and arranged directly over the container
means; the grapple assembly 34 is lowered with the jaw means 38',
38" in expanded configuration and with the lift hook elements 40'f,
40'r; 40"f, 40"r arranged on opposite sides of the container; the
lift hook elements are than convergingly moved by actuating the
piston-cylinder assemblies 64', 64", thereby arranging the hook
members directly under the lift rails 42', 42" and the trigger
element 44e under the release rod element 32a; the boom means 16 of
the crane unit 14 may then be raised slightly thereby raising the
lift hook elements to engagement with the container lift rails 42',
42", and simultaneously raising the trigger element 44e to a
disposition contiguous to the underside of the release rod element
32a. The boom means 16 of the crane unit may then be manipulated
and the container lifted and shifted to a disposition directly over
the body B of the haulage vehicle. The trigger mechanism may then
be actuated by energizing the piston-cylinder assembly 44a, 44b,
raising the trigger element 44d, raising the release rod element
32a and bail assembly 32c, releasing the latch dog means 30,
permitting the drop bottom wall to swing open and drop the load
into the body of the haulage vehicle. The container box may then be
repositioned on the ground by swinging the boom and lowering the
grapple assembly; as the container box is lowered to a position on
the ground, the roller means 72 engages the ground surface and
carries the container bottom to a closed latch configuration. The
grapple assembly 34 may then be disengaged from the container by
sequentially lowering and expanding the lift jaws 38', 38", moving
the lift hooks oppositely outwardly of the container structure, and
the trigger element 44d outwardly of the release rod element 32a;
the grapple assembly may then be lifted and manipulated to a stowed
disposition supported on the crane vehicle.
While the instant invention is shown and described in an embodiment
presently considered as being a preferred embodiment, it will be
appreciated that various changes and modification in structure may
be made without departing from the spirit and scope of the
invention.
* * * * *