GB2157651A - Forklift accessory - Google Patents
Forklift accessory Download PDFInfo
- Publication number
- GB2157651A GB2157651A GB8510053A GB8510053A GB2157651A GB 2157651 A GB2157651 A GB 2157651A GB 8510053 A GB8510053 A GB 8510053A GB 8510053 A GB8510053 A GB 8510053A GB 2157651 A GB2157651 A GB 2157651A
- Authority
- GB
- United Kingdom
- Prior art keywords
- container
- lifting bar
- accessory
- tines
- forklift
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
- B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/12—Platforms; Forks; Other load supporting or gripping members
- B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
- B66F9/142—Movements of forks either individually or relative to each other
- B66F9/144—Movements of forks relative to each other - independent
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
An accessory 50 for use with the tines 36 of a forklift in unloading cargo 44 from a container 42 where the cargo has a lifting bar 60. The accessory comprises a framework having a pair of tine accepting chambers 54 and a pair of lifting bar engaging hooks 58 depending from the framework. <IMAGE>
Description
SPECIFICATION
Forklift accessory
Field of the invention
This invention relates to an attachment for a forklift and more particularly to an accessory for a fork extension for a telescoping boom-type forklift for use in loading and unloading a fragile cargo from commercial containers of the type that ride piggy-back on trucks, ships and railroad cars.
This invention is particularly suited for retrieving missile pods having a lifting bar from a twenty foot commercial container and is particularly useful when a customary loading dock is unavailable which is typically the case in a military setting.
These containers typically have a vertical cross section of eight feet by eight feet, are twenty feet long and are open at one of their ends.
Background of the invention
Heretofore, boom-type forklifts have utilized a telescoping boom to which was attached a typical carriage with two forks. The fork attachment was operatively connected to the boom by means of hydraulic cylinders which could be slaved to the cylinders operating the boom. In this manner, the fork attachment could be maintained in a relatively horizontal position regardless of the pivotal up and down motion of the boom.
When the boom was extended in a substantially horizontal position, the forklift attachment would be substantially vertical in order to maintain the fork tines which are connected to the attachment at a 90" angle in a substantially horizontal position.
Thus, the forklift attachment presented a very high profile when the boom was in a substantially horizontal position. This substantially limited the forklift's ability to load and/or unload pallets or containers densely packed in truck trailers or trailer mounted vans.
In view of the restrictions inherent in prior art forklifts, a variety of unloading methods have been used, all of which have drawbacks and disadvantages.
In using an ordinary forklift to unload pallets from a truck mounted container in the field, it was proposed to provide a ramp so that the forklift could enter the container and unload the cargo.
This method has the obvious drawback of requiring a portable ramp and requiring that the forklift itself make several trips into and out of the container.
A "slip sheet" method of unloading pallets was also proposed in which a plastic or metal sheet was placed on the floor of the container and the pallets were placed on this sheet. When unloading the container the "slip sheet" would be pulled from the container onto a flatbed truck. Once on the flatbed truck ordinary forklifts would approach the cargo from the side of the truck and commence unloading the pallet. Besides the obvious problem of having the slip sheet tear, there was also the problem posed when the flatbed truck was not perfectly level or aligned with the container. These conditions would result in the slip sheet moving off to the side of the flatbed truck causing the pallets to fall.
In unloading missile pods from the container, it was customary to attach chains to the missile pods and drag them to the edge of the container until at least half of the missile pod extended out beyond the edge of the container. A first forklift would then engage the front of the missile pod to prevent it from falling while a second forklift would move in from the side of the missile pod and engage it at its approximate center of gravity so that it could be lifted from the container and transported to its ultimate location. This unloading method presented the hazard of precariously balancing a missile pod on the edge of a container and also necessitated the use of three pieces of machinery: one to pull the pods from the container, one to support the emerging end of the pod and one to engage the center of the pod and remove it from the container.
It is an object of the present invention to provide an accessory for a forklift attachment that is specifically adapted for "unloading" fragile cargo such as missile pods having lifting bars from truck trailers or trailer mounted vans or containers.
Summary of the invention
An accessory for a forklift attachment for a boom-type forklift for use in loading and unloading a fragile cargo from commercial containers of a predetermined length includes a tine engaging portion for connecting the forklift tines to the accessory.
In accordance with another aspect of the invention, the accessory is provided with a pair of lifting bars engaging hooks that depend from the accessory frame.
In accordance with another aspect of the invention, the entire accessory provides a low profile so as to facilitate its entry into a cargo filled container.
In accordance with yet another aspect of the invention, the accessory is dimensioned so as to allow the accessory to be engaged with the lifting bar before or after the accessory has been placed on the forklift tines.
The present invention thus provides an accessory for a forklift attachment that is ideally suited to the loading and unloading of truck trailers or trailer mounted vans or containers in that the forklift attachment may be positioned in a substantially horizontal plane while the boom is maintained in a similar plane. The invention provides a very low profile for the forklift accessory and allows the boom and forklift accessory to be inserted into a closely packed trailer or the containerized shipping.
Maintaining a low profile is important when it is understood that containers of a predetermined size are utilized in trailers and containerized shipping.
The tines of the forklift attachment must be able to engage and lift cargo from deep recesses and/or with very small height clearance.
The horizontal movement of the tines on the fork facilitates the precise positioning needed for engaging the lift rod on a missile pod and for sliding beneath a cargo pallet. The horizontal movement of the tines also permits the cargo to be shifted in a horizontal plane prior to removing it from the container so as to free it from the container wall or adjacent cargo.
Brief description of the drawings
The drawings illustrate the best mode presently contemplated of carrying out the invention.
In the drawings:
Figure 1 is a prospective view of a boom-type forklift that utilizes the invention;
Figure 2 is a side elevational schematic of the forklift of Figure 1 shown unloading a pallet from a container placed on the ground;
Figure 3 is a side elevational schematic of the forklift shown in a raised position utilizing the invention to unload pods from a container placed on the ground;
Figure 4 is a side elevational schematic of the forklift shown unloading a pallet from a container located on an elevated truck bed;
Figure 5 is a side elevational of the forklift of Figure 3 shown unloading pods from a container located on an elevated truck bed;
Figure 6 is a side elevational view of the double hooked tine accessory constructed according to the invention and shown in use in Figure 3;
Figure 7 is a front elevational view of the tine acaccessory of Figure 4; and
Figure 8 is a schematic diagram of the leveling circuit utilized to maintain the tines in a substantially horizontal position.
Description of the preferred embodiment
A telescoping boom-type forklift 10 includes a telescoping boom 12 having its inner end 14 pivotally mounted to a rough terrain vehicle having vehicular body 16. Vehicular body 16 is of the type described in U.S. Pat. No. 3,937,339 (the disclosure of which patent is incorporated herein by reference) in that it is provided with a leveling device that allows the vehicle body to be tilted relative to the wheeled frame. This makes forklift 10 particularly adapted to used in an uneven terrain. Forklifts such as this are typically about twenty-four feet long in the carry position, ninety-six inches wide and eight feet high (boom horizontal)
As is customary with machinery of this type, hydraulic cylinders 18 are utilized to position boom 12 at a variety of angles with respect to the horizontal.
An extension portion 20 is pivotally mounted to the outer end 22 of boom 12 by means of mounting plate 24 and hydraulic cylinders 26, with the pivot axis of the connection of the cylinder 26 to the plate 24 located well below the pivot axis for the extension 20 as shown, it is feasible to swing the extension to a level such that it is generally aligned with or even beyond the longitudinal axis of the boom 12.
The inner end of extension 20 is provided with a pair of lights 27 fixedly mounted to the sides of extension 20 so that lights 27 will follow the movement of extension 20.
As shown in Figure 2, the fork assembly 28 is pivotally connected to the outer end 30 of extension 20 by means of connecting plate 32 and hydraulic cylinders 34. Thus, fork assembly 28 may be pivoted in a vertical plane and this pivotal motion is completely independent of the pivotal motion of boom 12 and/or the pivotal movement of extension portion 20.
As best seen in Figure 1 fork assembly 28 includes a pair of telescoping hydraulic cylinders 38 that are mounted for horizontal movement of fork tines 36.
The horizontal movement of tines 36 is power driven and more specifically hydraulically powered and each of tines 36 may be moved independently of the other. Further, each of the tines may be moved past a centerline 120 of the extension portion 20 so as to position both tines 36 to one side or the other of the centerline 120.
As seen in each of the figures, fork assembly 28 is normally kept in a horizontal plane. In the past, this has been accomplished by the operator through the exercise of good judgement in manipulating the controls of the hydraulic cylinders and by automatic systems that the operator could activate if desired. For example, a level condition of the load during high lift operations could be maintained by having fork cylinders 34 slave to boom cylinders 18 so that pivotal moron boom 12 resulted in a corresponding motion of fork assembly 28 and the fork assembly was kept in a substantially horizontal position.
However, due to the number of possible positions of extension portion 20, the maintaining of a horizontal position for fork assembly 28 cannot be accomplished by making fork cylinders 34 slave to boom cylinders 18. For example, Figure 1 shows the extension portion 20 in a position which is substantially vertically positioned, i.e., the hydraulic cylinder 26 is substantially fully retracted and the tines 36 are substantially horizontal to the horizon and the boom 12 is fully retracted. Figure 2 discloses a fully extended boom 12 with the extension portion 20 partially extended, by cylinder 26, so as to enable the tines 36 to engage and support a pallet 40. The amount of clearance between the extended boom 12 and the top wall of the container 42 is indicated by a distance D. Accordingly, the cylinder 18 could not be extended to any substantial degree to raise the boom 12 and thereby lift the pallet 40. Therefore, any lifting of the pallet 40 is necessarily accomplished by extending the hydraulic cylinder 26 so as to pivot the extension portion 20 and lift pallet 40. As explained below, the tines 36 are required to remain within a small range of movement to the horizontal.
Figure 3 shows the mobile unit 10 unloading cargo 44 which requires the extension portion 20 to be substantially in a plane parallel to a horizontal plane defined by the cargo 44. In this instance, the distance D again provides only a small clearance. The boom 12 is shown in a substantially fully retracted position with the hydraulic cylinder 18 in a substantially fully retracted position so as to provide the low profile clearance necessary between the top wall of the container 42 and the mounting plate 24. As in Figure 2, the tines 36 are required to be substantially horizontal to the plane defined by the cargo 44. In order to maintain the low profile, the cylinder 18 can only be adjusted to a limited degree as the cargo 44 is lifted and removed from the container 42.Accordingly, hydraulic cylinders 26 are substantially fully extended so as to position the extension 20 in the same plane as the tines 36.
Since tines 36 are independently pivotally adjustable, the hydraulic cylinder 34 will maintain the tines 36 in the horizontal plane during adjustment of the extension position 20.
Figure 4 shows the mobile unit 10 unloading a pallet 40 from an elevated container 42 as would be the case when the container was located on a truck bed 45. In this instance boom 12 is substantially fully extended and hydraulic cylinders 26 and 34 are partially extended to place tines 36 beneath pallet 40. Pallet 40 is lifted by initially raising boom 12. After boom 12 has been retracted slightly pallet 40 can be lifted further by extending cylinders 26.
Figure 5 shows the mobile unit 10 unloading cargo 44 from an elevated container 42, which requires extension portion 20 to be substantially in a plane parallel to a horizontal plane defined by the cargo 44. Boom 12 is slightly elevated by cylinders 18 and is partially extended. Hydraulic cylinders 26 and 34 are fully extended so as to place extension 20 in the same plane as tines 36.
Fork assembly 28 has been provided with a leveling circuit 29 schematically shown in Figure 8.
Leveling circuit 29 includes pendulum switch 31 located on assembly 28 directly behind cylinders 38.
While other forms of automatic leveling may be used, a pendulum switch such as that sold by P-Q
Controls, Inc. under Model No. 410 has been found to be appropriate for the particular needs of this application. Pendulum switch 31 is mounted at an angle so that a 2" upward tilt of tines 36 will be detected by switch 31 as horizontal. The pendulum of switch 31 swings in a path substantially parallel to the longitudinal axes of tines 36 and is adjusted to generate a signal upon detecting a predetermined angle in the range of 12 to 3 . The output of switch 31 is connected to a select switch 33 which allows switch 31 to be removed from the circuit so that manual control 37 may be utilized.The pendulum switch is operatively connected via switch 33 to a proportional solenoid control valve 39 located behind plate 35 on extension portion 20. The control valve 39 controls the fluid that is provided to hydraulic cylinders 34. Upon sensing a non-horizontal condition for fork assembly 28, the pendulum switch 31 provides a signal to the solenoid control valve 39 and hydraulic fluid is provided from pump 41 to cylinders 34 in order to maintain fork assembly 28 in a relatively horizontal position.
Figure 2 illustrates the use of the forklift attachment in unloading a pallet 40 from a forward position in a container 42. While Figure 2 and Figure 3 show the cargo container on the ground or on the same level as forklift 10, it should be appreciated that forklift 10 is particularly well suited to unloading containers that are elevated as when carried by a truck trailer. Here boom 12 is extended to substantially its maximum length and extension 20 is positioned at the proper angle in order to provide further fork extension and also to position fork assembly 28 beneath the pallet. The horizontal movement of tines 36 is particularly helpful in this operation in that various cargo pallets 40 may have different tine accepting areas and forklift 10 may not always be perfectly aligned with pallet 40.
Since both of these situations may arise in a single cargo handling operation, the tines 36 are provided with a wide range of horizontal movement including movement from their extreme outboard position shown in Figure 1 to a position beyond the centerline 120 so as to enable both tines 36 to be positioned on one side of the centerline 120. Also, it is not unusual during transportation for pallet 40 to have shifted and become engaged with the wall of container 42 or with an adjacent pallet. A slight horizontal movement of tines 36 will disengage pallet 40 and the pallet may then be removed by either preferably retracting telescoping boom12 or by backing forklift vehicle 10 away from container 42.
Figure 3 illustrates the use of forklift 10 when rmeoving a cargo filled container or pod 44 such as a missile pod from a container 42. In this operation, forklift 10 utilizes a double hooked tine accessory 50. Accessory 50 consists of a rectangular framework 52 divided into a pair of tine receiving chambers 54 by center plate 56. A pair of lifting bar engaging hooks 58 are attached to framework 52 and extend downwardly with one hook 58 centered and below each of chambers 54. The entire height of accessory 50 is approximately nine inches so as not to add to the low profile because it is in a situation such as this that the low profile of extension portion 20 and fork assembly 28 are extremely advantageous. Each of pods 44 is provided with a recessed lifting bar 60 located at the approximate center of gravity of pod 44 in an opening 62.In that lifting bar 60 does not run the entire width of pod 44 the horizontal movement of tines 36 and the resulting horizontal movement of accessory 50 once again is very important. As is seen in Figure 3, tines 36 are horizontally positioned and inserted through chambers 54. Accessory 50 may be manually engaged with lifting bar 60 and then tines 36 inserted into chambers 54 or accessory 50 may be positioned for engagement with lifting bar 60 while it is on tines 36. Extension portion 20 is moved to a substantially horizontal position and fork assembly 28 is maintained in a substantially horizontal position. Hooks 58 are positioned above opening 62 behind lifting bar 60.
Hooks 58 are then lowered into opening 62 and moved forward until the back portion 64 of hooks 58 engages lifting bar 60. Pod 44 may then be lifted slightly and, if necessary, be moved horizontally, as discussed above in order to disengage it from the container wall or adjacent pods. Pod 44 may then be removed from container 42 by preferably retracting boom 12 if in an extended position or by backing forklift 10 away from container 42.
While Figures 2 and 3 illustrate only two applica tions of the present invention, extension 20 and fork assembly 28 may be positioned in an endless number of combinations and thus the potential uses for a forklift extension of this type are virtually endless.
Various modes for carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention.
Claims (4)
1. A boomed forklift tine accessory for unloading a cargo from a container where said cargo has a lifting bar, said accessory comprising a framework having a tine engaging portion for releasably connecting at least one of said tines to said accessory and a lifting bar engaging portion for releasably engaging said accessory with said lifting bar in order to lift said container upon relative upward movement of the boom.
2. The accessory defined in claim 1 wherein said tine framework comprises at least one chamber into which said tines may be inserted and at least one hook depending from said framework for engagement with said lifting bar.
3. The accessory defined in claim 2 wherein said framework defines a pair of chambers with each of said chambers receiving one of said tines and a lift bar engaging hook depends from each of said chambers.
4. A method of unloading a cargo carrying container from an enclosure having access through a single opening, wherein said containers are substantially rectangular and have a lifting bar disposed across the width of the container and within a recess in the container, the containers being disposed within the enclosure such that the longitudinal axes of the lifting bars is substantially horizontal and parallel to the plane formed by the opening to the enclosure, said method comprising
inserting lifting bar engaging means connected to a telescoping boom through the opening of the enclosure
positioning said lifting bar engaging means above the recess in the container
lowering the lifting bar engaging means into the recess
engaging the lifting bar with the lifting bar engaging means
lifting the container and
retracting the lifting bar engaging means from the enclosure through the opening.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US60320984A | 1984-04-23 | 1984-04-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8510053D0 GB8510053D0 (en) | 1985-05-30 |
GB2157651A true GB2157651A (en) | 1985-10-30 |
Family
ID=24414482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8510053A Withdrawn GB2157651A (en) | 1984-04-23 | 1985-04-19 | Forklift accessory |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS60236997A (en) |
DE (1) | DE3514525A1 (en) |
FR (1) | FR2563204A1 (en) |
GB (1) | GB2157651A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0228208A1 (en) * | 1985-12-27 | 1987-07-08 | Kidde, Inc. | Forklift variable reach mechanism |
IT201900012864A1 (en) * | 2019-07-25 | 2021-01-25 | Giacomo Berti | MOBILE LIFTING MEANS |
WO2023248112A3 (en) * | 2022-06-20 | 2024-02-08 | Manzi Consulenze S.R.L.S. | Equipment for handling a load |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2788759B1 (en) | 1999-01-27 | 2001-03-23 | Sambron | DEVICE FOR CONTROLLING THE MOVEMENT OF A CARRIER STRUCTURE OF A ROLLING MACHINE AND A ROLLING MACHINE INCORPORATING THE SAME |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2144096A (en) * | 1983-05-03 | 1985-02-27 | Koehring Co | Forklift attachment |
-
1985
- 1985-04-18 JP JP8150785A patent/JPS60236997A/en active Pending
- 1985-04-19 GB GB8510053A patent/GB2157651A/en not_active Withdrawn
- 1985-04-22 FR FR8506052A patent/FR2563204A1/en active Pending
- 1985-04-22 DE DE19853514525 patent/DE3514525A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2144096A (en) * | 1983-05-03 | 1985-02-27 | Koehring Co | Forklift attachment |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0228208A1 (en) * | 1985-12-27 | 1987-07-08 | Kidde, Inc. | Forklift variable reach mechanism |
IT201900012864A1 (en) * | 2019-07-25 | 2021-01-25 | Giacomo Berti | MOBILE LIFTING MEANS |
WO2023248112A3 (en) * | 2022-06-20 | 2024-02-08 | Manzi Consulenze S.R.L.S. | Equipment for handling a load |
Also Published As
Publication number | Publication date |
---|---|
DE3514525A1 (en) | 1985-10-24 |
GB8510053D0 (en) | 1985-05-30 |
JPS60236997A (en) | 1985-11-25 |
FR2563204A1 (en) | 1985-10-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |