EXPANDABLE TOP-HANDLING CONTAINER ATTACHMENT
United States Patent 3750814
An expandable, top-handling container, lift frame attachment for lifting and moving large cargo containers of varying lengths is provided. The lift frame attachment is adapted for easy attachment to, or detachment from a carriage of a large-size fork-lift truck, and includes telescoping, transverse beam members that can be extended or retracted in length to fit intermixed containers of various lengths.
US Patent References:
CONTAINER LIFT FRAME
Forry et al. - March 1970 - 3499563
LIFTING APPARATUS
Green - January 1971 - 3552557
VEHICLE FOR HANDLING CONTAINERS OF VARYING LENGTHS
Shaffer - April 1971 - 3576269
ANTIRACKING CONTAINER LIFT FRAME
Allegri et al. - May 1970 - 3514002
Container lifting frame for use with forklift truck
Hindin et al. - June 1968 - 3387729
CONTAINER LIFT FRAME
Forry et al. - March 1970 - 3499563
LIFTING APPARATUS
Green - January 1971 - 3552557
VEHICLE FOR HANDLING CONTAINERS OF VARYING LENGTHS
Shaffer - April 1971 - 3576269
ANTIRACKING CONTAINER LIFT FRAME
Allegri et al. - May 1970 - 3514002
Container lifting frame for use with forklift truck
Hindin et al. - June 1968 - 3387729
Inventors:
Allegri, Theodore Henry (Peoria, IL)
Chelin, Charles R. (Dallas, OR)
Evans, Dafydd W. (Cleveland Heights, OH)
Thompson, Norman D. (Dallas, OR)
Chelin, Charles R. (Dallas, OR)
Evans, Dafydd W. (Cleveland Heights, OH)
Thompson, Norman D. (Dallas, OR)
Application Number:
05/185698
Publication Date:
08/07/1973
Filing Date:
10/01/1971
View Patent Images:
Export Citation:
Assignee:
Towmotor Corporation (Cleveland, OH)
Primary Class:
International Classes:
B66F9/18; B66F9/19; B66F9/12; B66F9/18
Field of Search:
214/620,621,730 294/67D,67DA,81SF
US Patent References:
| 3589540 | FORKLIFT ATTACHMENTS | June 1971 | Kinross |
Primary Examiner:
Spar, Robert J.
Claims:
What is claimed is
1. A cargo container lift frame comprising
2. A cargo container lift frame comprising
3. The lift frame of claim 2 wherein said hydraulic cylinder means comprise,
4. The lift frame of claim 3 wherein said hydraulic cylinder means further comprise,
5. The lift frame of claim 4 wherein said first hydraulic cylinder means comprises,
6. The lift frame of claim 4 wherein said container engaging means comprises twist locks adapted for engagement into container corner castings and means for locking and unlocking said twist locks from container corner castings.
7. The lift frame of claim 5 wherein said control valve means comprise, a plurality of control valves for selectively actuating said first and second, said third and fourth, and said fifth and sixth hydraulic cylinders, respectively.
8. The lift frame of claim 1 wherein said control valve means comprise, control valves for selectively actuating said first and second, and said third and fourth hydraulic cylinders, respectively.
9. The lift frame of claim 1 further including a cushioning member on said upright frame.
10. The lift frame of claim 9 wherein said cushioning member is mounted in a transverse direction on the lower portion of said upright frame.
11. The lift frame of claim 1 wherein said container engaging means comprises twist locks adapted for engagement into container corner castings and means for locking and unlocking said twist locks from container corner castings.
12. The lift frame of claim 1 further including load damper means for damping motion of said first and second lift beams.
1. A cargo container lift frame comprising
2. A cargo container lift frame comprising
3. The lift frame of claim 2 wherein said hydraulic cylinder means comprise,
4. The lift frame of claim 3 wherein said hydraulic cylinder means further comprise,
5. The lift frame of claim 4 wherein said first hydraulic cylinder means comprises,
6. The lift frame of claim 4 wherein said container engaging means comprises twist locks adapted for engagement into container corner castings and means for locking and unlocking said twist locks from container corner castings.
7. The lift frame of claim 5 wherein said control valve means comprise, a plurality of control valves for selectively actuating said first and second, said third and fourth, and said fifth and sixth hydraulic cylinders, respectively.
8. The lift frame of claim 1 wherein said control valve means comprise, control valves for selectively actuating said first and second, and said third and fourth hydraulic cylinders, respectively.
9. The lift frame of claim 1 further including a cushioning member on said upright frame.
10. The lift frame of claim 9 wherein said cushioning member is mounted in a transverse direction on the lower portion of said upright frame.
11. The lift frame of claim 1 wherein said container engaging means comprises twist locks adapted for engagement into container corner castings and means for locking and unlocking said twist locks from container corner castings.
12. The lift frame of claim 1 further including load damper means for damping motion of said first and second lift beams.
Description:
CROSS REFERENCE TO RELATED APPLICATION
Reference is made to related copending application Ser. No. 185,699, filed Oct. 1, 1971, which discloses an expandable, side-handling, as opposed to top-handling, lift frame for containers.
BACKGROUND OF THE INVENTION
At the present time, large cargo containers are handled by various means including: lift cranes; fork-lift trucks when the containers are equipped with fork-lift pockets; straddle carriers; straddle cranes; and, a proliferation of U-frame or sliding-bed devices, all of which do not permit the most efficient handling of containers to be achieved.
Attachments that are adaptable to fork-lift truck carriages are also being used, but lack versatility in handling containers of intermixed sizes without removing one attachment and replacing it with another one of a size suitable for the container to be handled. This has posed serious limitations on their acceptance by industry. It can be understood that the need to change attachments to accommodate different length containers is expensive from the standpoint of equipment investment, the cost of labor to accomplish the changeover, and the loss of production that is caused by having the vehicle idle during the changeover of attachments.
SUMMARY OF THE INVENTION
The present invention provides a top-handling container attachment for a fork-lift truck that is operator-controlled to adjust itself to fit intermixed cargo containers of varying lengths with little or no loss of vehicle operation time. The subject lift frame is easily attached to or detached from a standard fork-lift carriage. This has the benefit of having economic advantages of a truly versatile lift truck that can function either as a fork-lift truck or as a container carrier machine.
By the use of a hydraulic control means and hydraulic lines connected to hydraulic cylinder means, located either outside or inside of the telescoping transverse beam member, the adjustment of the load-supporting beams and associated container twist locks to handle various length containers is achieved.
OBJECTS OF THE INVENTION
Accordingly, it is a primary object of this invention to provide a top-handling container attachment for industrial fork-lift trucks.
It is another object to provide an attachment for fork-lift trucks that will handle cargo containers of various lengths.
Also, it is an object of this invention to provide an attachment for fork-lift trucks that will handle intermixed cargo containers of various lengths.
It is a further object to provide a fork-lift truck, lift-frame attachment having means adjustable by the vehicle operator to fit cargo containers of various lengths.
A further object is to provide a lift-frame which is adjustable as to length by means of an operator-controlled adjustment system that requires no removal or addition of parts 30 accommodate itself to different length containers.
Another object of this invention is to provide a lift-frame which is adjustable as to length to accommodate various length containers and having container-gripping means for engaging and top-handling containers.
Another object of this invention is to provide a lift-frame attachment that can be easily mounted to or removed from a fork truck carriage.
Additional advantages and features of the present invention are made apparent in the following description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of the container lift-frame according to the present invention mounted on a suitable fork-lift truck;
FIG. 2 is a front elevation of the container lift-frame of FIG. 1;
FIG. 3 is an end view of the container lift-frame of FIG. 1;
FIG. 4 is an illustration of one of the means on the device for coupling and locking to a container;
FIG. 5 is an enlarged view of the slide member located between each pair of inner and outer cylinders; and
FIG. 6 is an enlarged, partial, front sectional view of a second embodiment of the instant invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the primary embodiment of the invention shown in FIGS. 1 - 5, there is illustrated a partial view of a lift truck 10 which includes a standard fork-lift truck mast and a fork carriage 12 (with forks removed) upon which is mounted the container lift-frame attachment 14. A suitable attaching and retaining means, such as described in U. S. Pat. No. 3,499,563 to J. E. Forry et al., and assigned to the assignee hereof, may be used to attach the frame to the carriage. The lift-frame of this invention comprises a vertical frame 16 having two outwardly extending, horizontal support arms 18 that are attached to the transverse box-beam member 20. The entire lift-frame attachment 14 is removably mounted on fork carriage 12 which is conventionally attached to the mast structure of a lift truck 10. In the preferred embodiment shown, the lift forks are removed from the fork carriage 12 before mounting the attachment 14 thereon. Alternatively, lift-frame attachment 14 could be directly mounted on the lift forks (not shown) of the carriage 12.
The transverse beam 20 is of a hollow box beam shape, within which telescope the extensible transverse beam members 22 of a similar shape. These beam members are adapted to slidably travel outwardly and inwardly. The load support beam members 24 can thus be positioned to connect with cargo containers 54 of varying lengths. Appended to the outer ends of each transverse beam member 22 are downwardly extending lugs 28 and 30, fixed thereto to pivotally support the extending load support and lift beams 24.
The load support and lift beams 24 are pivoted to the lugs 28 and 30 by pin 32, that passes through the longitudinal mid-point of beam 24 and is retained within bearing holes in the lower portion of the depending lugs. Thus, support and lift beams 24 are free to rotate in the vertical plane about the point fixed by pin 32. However, the support and lift beams 24 are limited in their extent of rotation by resilient load stops (not shown) and by a load damper means 34, it being rotatably attached by known means to load support and lift beam 24 and the cross beam member 22.
As most clearly illustrated in FIGS. 3 - 4, a pair of standard twist locks 26 depends from support and lift beam 24, one at either end thereof.
If a more complete description of the structure and operation of the load support lift beam is desired, reference may be had to aforementioned U.S. Pat. No. 3,499,563 to J. E. Forry et al. The disclosure of that patent is expressly incorporated by reference herein.
The transverse movement of the extensible cross beam member 22 within beam member 20 is best shown in FIGS. 1 and 5. The head end of hydraulic cylinder means 36 is pivotally attached to brackets 52, with said brackets being fixed within the box beam member 20. The rod-end 40 of the cylinder means 36 is pivotally attached by means of pin 48 to the sliding link assembly 42.
As seen in FIG. 5, pin 48 thus acts to secure the rod 40 to the slider assembly plate 46, which in turn is welded to two slider plates 44. Pin 50 is located in the opposite end of plate 46 from pin 48, with the pin 50 rotatably securing the head end of hydraulic cylinder means 38 to the slider assembly 42. The rod end 49 of cylinder means 38 is pivotally secured to a plurality of brackets 51 which are secured to the outer end of the box beam member 22.
Typically, the beams are dimensioned so that when transverse beam members 22 are fully retracted to provide a minimum length transverse beam, a standard 20 foot long minimum length cargo container can be accommodated. When a container of greater length is to be lifted and moved, the lift truck operator can actuate a plurality of hydraulic control valve means 29 of known construction to introduce hydraulic fluid under pressure to a plurality of hydraulic cylinder means 36, 38, which will, in turn, cause beam members 22 to slidably travel in a transverse, outward direction.
The operation of adjusting the instant invention transverse beam member from its minimum length to a length that will accommodate longer cargo containers, such as those having lengths of 24 or 27 feet, will be further described.
With the attachment 14 transverse beam assembly at its basic minimum length, the operator can actuate a hydraulic control valve means 29 of known construction that will, in turn, provide hydraulic fluid under pressure to the two hydraulic cylinders 36. This action will extend cylinder rods 40, the two slide assemblies 42, and cylinders 38, thus positioning the adjustable transverse members 22 and the associated support and lift beams 24 for attachment to the next longer size cargo container, e.g., 24 feet. If a still longer cargo container is to be lifted, e.g., 27 feet, the operator can actuate a hydraulic control valve of known construction, to provide hydraulic fluid pressure to the two hydraulic cylinders 38, thus further extending transverse beam members 22 and their associated support and lift beams 24. The control valve means 29 previously mentioned is understood to be such that either one valve control lever or pedal actuates cylinders 36 and a similar lever or pedal actuates cylinders 38, or a single valve and control means actuates both cylinders 36 and 38.
An alternate means is presented in which the hydraulic control valve means initially actuates the hydraulic cylinders 36 and when greater extension of the transverse beam is desired, it then actuates the hydraulic cylinders 38.
An alternative embodiment is shown in FIG. 6 which would accommodate very long containers of 30 or 40 feet. It may be parenthetically noted that primes are used throughout the following discussion to denote structure having its analogous numerical counterpart in the primary embodiment.
In this embodiment, additional telescoping beams 64 are provided intermediate beams 20' and 22'. Hydraulic cylinders 36' are fixed to these slidable beams 64 by means of brackets 52'. In addition, a plurality of hydraulic cylinders 56 having their head ends pivotally secured to beam 20' and their rod ends 58 to beam 64 by means of brackets 60 and 62, respectively, are provided. Hydraulic control means 29' is used to provide hydraulic fluid under pressure for actuating these hydraulic cylinders. While only one-half of the entire structure is shown in FIG. 6, it is to be understood that the other half is identical with the first half.
While a preferred embodiment and an alternate embodiment of the invention have been shown and described, it is apparent to any one skilled in the art that various other forms would be possible without departing from the spirit of the invention or the scope of the following claims. It is further understood that the scope of the invention is not to be limited to the thus illustrated embodiments, but is to be determined by the scope of the appended claims.
Reference is made to related copending application Ser. No. 185,699, filed Oct. 1, 1971, which discloses an expandable, side-handling, as opposed to top-handling, lift frame for containers.
BACKGROUND OF THE INVENTION
At the present time, large cargo containers are handled by various means including: lift cranes; fork-lift trucks when the containers are equipped with fork-lift pockets; straddle carriers; straddle cranes; and, a proliferation of U-frame or sliding-bed devices, all of which do not permit the most efficient handling of containers to be achieved.
Attachments that are adaptable to fork-lift truck carriages are also being used, but lack versatility in handling containers of intermixed sizes without removing one attachment and replacing it with another one of a size suitable for the container to be handled. This has posed serious limitations on their acceptance by industry. It can be understood that the need to change attachments to accommodate different length containers is expensive from the standpoint of equipment investment, the cost of labor to accomplish the changeover, and the loss of production that is caused by having the vehicle idle during the changeover of attachments.
SUMMARY OF THE INVENTION
The present invention provides a top-handling container attachment for a fork-lift truck that is operator-controlled to adjust itself to fit intermixed cargo containers of varying lengths with little or no loss of vehicle operation time. The subject lift frame is easily attached to or detached from a standard fork-lift carriage. This has the benefit of having economic advantages of a truly versatile lift truck that can function either as a fork-lift truck or as a container carrier machine.
By the use of a hydraulic control means and hydraulic lines connected to hydraulic cylinder means, located either outside or inside of the telescoping transverse beam member, the adjustment of the load-supporting beams and associated container twist locks to handle various length containers is achieved.
OBJECTS OF THE INVENTION
Accordingly, it is a primary object of this invention to provide a top-handling container attachment for industrial fork-lift trucks.
It is another object to provide an attachment for fork-lift trucks that will handle cargo containers of various lengths.
Also, it is an object of this invention to provide an attachment for fork-lift trucks that will handle intermixed cargo containers of various lengths.
It is a further object to provide a fork-lift truck, lift-frame attachment having means adjustable by the vehicle operator to fit cargo containers of various lengths.
A further object is to provide a lift-frame which is adjustable as to length by means of an operator-controlled adjustment system that requires no removal or addition of parts 30 accommodate itself to different length containers.
Another object of this invention is to provide a lift-frame which is adjustable as to length to accommodate various length containers and having container-gripping means for engaging and top-handling containers.
Another object of this invention is to provide a lift-frame attachment that can be easily mounted to or removed from a fork truck carriage.
Additional advantages and features of the present invention are made apparent in the following description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view of the container lift-frame according to the present invention mounted on a suitable fork-lift truck;
FIG. 2 is a front elevation of the container lift-frame of FIG. 1;
FIG. 3 is an end view of the container lift-frame of FIG. 1;
FIG. 4 is an illustration of one of the means on the device for coupling and locking to a container;
FIG. 5 is an enlarged view of the slide member located between each pair of inner and outer cylinders; and
FIG. 6 is an enlarged, partial, front sectional view of a second embodiment of the instant invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring now to the primary embodiment of the invention shown in FIGS. 1 - 5, there is illustrated a partial view of a lift truck 10 which includes a standard fork-lift truck mast and a fork carriage 12 (with forks removed) upon which is mounted the container lift-frame attachment 14. A suitable attaching and retaining means, such as described in U. S. Pat. No. 3,499,563 to J. E. Forry et al., and assigned to the assignee hereof, may be used to attach the frame to the carriage. The lift-frame of this invention comprises a vertical frame 16 having two outwardly extending, horizontal support arms 18 that are attached to the transverse box-beam member 20. The entire lift-frame attachment 14 is removably mounted on fork carriage 12 which is conventionally attached to the mast structure of a lift truck 10. In the preferred embodiment shown, the lift forks are removed from the fork carriage 12 before mounting the attachment 14 thereon. Alternatively, lift-frame attachment 14 could be directly mounted on the lift forks (not shown) of the carriage 12.
The transverse beam 20 is of a hollow box beam shape, within which telescope the extensible transverse beam members 22 of a similar shape. These beam members are adapted to slidably travel outwardly and inwardly. The load support beam members 24 can thus be positioned to connect with cargo containers 54 of varying lengths. Appended to the outer ends of each transverse beam member 22 are downwardly extending lugs 28 and 30, fixed thereto to pivotally support the extending load support and lift beams 24.
The load support and lift beams 24 are pivoted to the lugs 28 and 30 by pin 32, that passes through the longitudinal mid-point of beam 24 and is retained within bearing holes in the lower portion of the depending lugs. Thus, support and lift beams 24 are free to rotate in the vertical plane about the point fixed by pin 32. However, the support and lift beams 24 are limited in their extent of rotation by resilient load stops (not shown) and by a load damper means 34, it being rotatably attached by known means to load support and lift beam 24 and the cross beam member 22.
As most clearly illustrated in FIGS. 3 - 4, a pair of standard twist locks 26 depends from support and lift beam 24, one at either end thereof.
If a more complete description of the structure and operation of the load support lift beam is desired, reference may be had to aforementioned U.S. Pat. No. 3,499,563 to J. E. Forry et al. The disclosure of that patent is expressly incorporated by reference herein.
The transverse movement of the extensible cross beam member 22 within beam member 20 is best shown in FIGS. 1 and 5. The head end of hydraulic cylinder means 36 is pivotally attached to brackets 52, with said brackets being fixed within the box beam member 20. The rod-end 40 of the cylinder means 36 is pivotally attached by means of pin 48 to the sliding link assembly 42.
As seen in FIG. 5, pin 48 thus acts to secure the rod 40 to the slider assembly plate 46, which in turn is welded to two slider plates 44. Pin 50 is located in the opposite end of plate 46 from pin 48, with the pin 50 rotatably securing the head end of hydraulic cylinder means 38 to the slider assembly 42. The rod end 49 of cylinder means 38 is pivotally secured to a plurality of brackets 51 which are secured to the outer end of the box beam member 22.
Typically, the beams are dimensioned so that when transverse beam members 22 are fully retracted to provide a minimum length transverse beam, a standard 20 foot long minimum length cargo container can be accommodated. When a container of greater length is to be lifted and moved, the lift truck operator can actuate a plurality of hydraulic control valve means 29 of known construction to introduce hydraulic fluid under pressure to a plurality of hydraulic cylinder means 36, 38, which will, in turn, cause beam members 22 to slidably travel in a transverse, outward direction.
The operation of adjusting the instant invention transverse beam member from its minimum length to a length that will accommodate longer cargo containers, such as those having lengths of 24 or 27 feet, will be further described.
With the attachment 14 transverse beam assembly at its basic minimum length, the operator can actuate a hydraulic control valve means 29 of known construction that will, in turn, provide hydraulic fluid under pressure to the two hydraulic cylinders 36. This action will extend cylinder rods 40, the two slide assemblies 42, and cylinders 38, thus positioning the adjustable transverse members 22 and the associated support and lift beams 24 for attachment to the next longer size cargo container, e.g., 24 feet. If a still longer cargo container is to be lifted, e.g., 27 feet, the operator can actuate a hydraulic control valve of known construction, to provide hydraulic fluid pressure to the two hydraulic cylinders 38, thus further extending transverse beam members 22 and their associated support and lift beams 24. The control valve means 29 previously mentioned is understood to be such that either one valve control lever or pedal actuates cylinders 36 and a similar lever or pedal actuates cylinders 38, or a single valve and control means actuates both cylinders 36 and 38.
An alternate means is presented in which the hydraulic control valve means initially actuates the hydraulic cylinders 36 and when greater extension of the transverse beam is desired, it then actuates the hydraulic cylinders 38.
An alternative embodiment is shown in FIG. 6 which would accommodate very long containers of 30 or 40 feet. It may be parenthetically noted that primes are used throughout the following discussion to denote structure having its analogous numerical counterpart in the primary embodiment.
In this embodiment, additional telescoping beams 64 are provided intermediate beams 20' and 22'. Hydraulic cylinders 36' are fixed to these slidable beams 64 by means of brackets 52'. In addition, a plurality of hydraulic cylinders 56 having their head ends pivotally secured to beam 20' and their rod ends 58 to beam 64 by means of brackets 60 and 62, respectively, are provided. Hydraulic control means 29' is used to provide hydraulic fluid under pressure for actuating these hydraulic cylinders. While only one-half of the entire structure is shown in FIG. 6, it is to be understood that the other half is identical with the first half.
While a preferred embodiment and an alternate embodiment of the invention have been shown and described, it is apparent to any one skilled in the art that various other forms would be possible without departing from the spirit of the invention or the scope of the following claims. It is further understood that the scope of the invention is not to be limited to the thus illustrated embodiments, but is to be determined by the scope of the appended claims.