EP3242846A1 - Cover for a forklift pocket of a shipping container - Google Patents

Cover for a forklift pocket of a shipping container

Info

Publication number
EP3242846A1
EP3242846A1 EP16700511.5A EP16700511A EP3242846A1 EP 3242846 A1 EP3242846 A1 EP 3242846A1 EP 16700511 A EP16700511 A EP 16700511A EP 3242846 A1 EP3242846 A1 EP 3242846A1
Authority
EP
European Patent Office
Prior art keywords
base
forklift
cover
resilient flap
shipping container
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Withdrawn
Application number
EP16700511.5A
Other languages
German (de)
French (fr)
Inventor
Julian Poyner
Adam Garth MASON
Jarema KRYWONOS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hfg Corporate Ltd
Original Assignee
Ferguson Group Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ferguson Group Ltd filed Critical Ferguson Group Ltd
Publication of EP3242846A1 publication Critical patent/EP3242846A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/02—Large containers rigid
    • B65D88/12—Large containers rigid specially adapted for transport
    • B65D88/121—ISO containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P7/00—Securing or covering of load on vehicles
    • B60P7/06—Securing of load
    • B60P7/13—Securing freight containers or forwarding containers on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/0033—Lifting means forming part of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00736—Details
    • B65D2519/00776—Accessories for manipulating the pallet
    • B65D2519/00796—Guiding means for fork-lift

Definitions

  • the present application relates to a shipping container and to a cover for covering a forklift pocket of the shipping container.
  • Shipping containers have been used for many years to transport goods. They are provided in standard sizes which allow them to be transported using appropriately configured ships, trucks or railway carriages. A shipping container may be transferred, for example, from a ship to an oil rig using a crane. A shipping container may also be transferred between storage locations using a forklift truck. In order to facilitate transport by forklift truck each shipping container is provided with forklift pockets which are configured to receive forklift tangs (which may also be referred to as prongs) of the forklift truck.
  • a problem associated with forklift pockets is that an object may enter the forklift pocket and may present a hazard at some future point in time. For example, a worker may put a spanner or screwdriver in a forklift pocket for convenience when working nearby and then forget to remove it.
  • an object such as an empty drinks can could be blown by wind into the forklift pocket.
  • the shipping container e.g. from a ship to an oil rig
  • the object may be blown out of the forklift pocket by wind (or may fall out due to tilting of the shipping container). This could cause injury to a worker. It is an object of the present invention to address the above problem or another problem associated with known forklift pockets.
  • a cover for a forklift pocket of a shipping container comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and being configured to substantially close the forklift pocket.
  • the cover reduces the likelihood of objects entering the forklift pocket. In addition, the cover prevents an object from falling out of the forklift pocket (or reduces the likelihood of the object falling out of the forklift pocket).
  • the at least one resilient flap may be sufficiently stiff that it projects upwardly from the base.
  • the at least one resilient flap may be sufficiently stiff to withstand a force of up to around 30N applied against it.
  • the at least one resilient flap may be sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed.
  • the at least one resilient flap may be held in a slot provided in the base.
  • the slot may be T-shaped in cross-section and a foot of the at least one resilient flap held in the slot may be T-shaped in cross-section.
  • the slot may be open at one end and closed at an opposite end.
  • the base may be a single piece of material.
  • the base may be a single piece of steel.
  • a plate may extend from one side of the base, the plate being configured to deflect a forklift tang away from the base.
  • the base may be provided with a sloping face.
  • the base may be provided with an additional sloping face on an opposite side.
  • the base may extend either side of the at least one resilient flap.
  • the base may be higher on one side of the at least one resilient flap than on the other side of the at least one resilient flap, the difference in height being greater than the thickness of the at least one resilient flap.
  • Corners of the at least one resilient flap distal to the base may be cut or rounded.
  • a target may be provided on the at least one resilient flap.
  • the at least one resilient flap may be brightly coloured.
  • the at least one resilient flap may be orange.
  • the at least one resilient flap may be configured to substantially close the forklift pocket in combination with the base.
  • a shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and substantially closing the forklift pocket.
  • the base may be secured to the floor of the forklift pocket and the at least one resilient flap may extend upwardly from the base.
  • the gap may be less than 1 cm.
  • the gap may be around 5mm.
  • the base may be secured to the floor of the forklift pocket and be provided with a sloping outer face which slopes upwardly in the direction of the at least one resilient flap.
  • An outer edge of the sloping outer face may be welded to the shipping container.
  • the at least one resilient flap may be sufficiently stiff to withstand a force of up to around 30N applied against it.
  • the at least one resilient flap may be sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed.
  • a shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a plurality of bases each provided with at least one resilient flap, the resilient flaps extending from the bases and substantially closing the forklift pocket.
  • the cover may comprise two bases each of which is provided with at least one resilient flap.
  • the second and third aspects of the invention may include features mentioned above in connection with the first aspect of the invention.
  • Figure 1 schematically depicts a shipping container with forklift pockets that have been fitted with covers according to an embodiment of the invention
  • Figures 2 and 3 depicts a cover and forklift pocket in more detail
  • Figure 4 depicts the cover and forklift pocket viewed from one side together with a forklift tang of a forklift truck;
  • Figures 5 - 7 are perspective views of the cover
  • Figure 8 is a perspective view of a cover according to an alternative embodiment of the invention.
  • Figure 9 is a perspective view of part of a base of a cover according to an alternative embodiment of the invention.
  • Figure 10 is a cross-sectional perspective view of a cover and forklift pocket according to an alternative embodiment of the invention.
  • Figure 1 1 is a cross-sectional perspective view of the cover shown in Figure 10;
  • Figure 12 is a perspective view from above of the base of the cover shown in Figures 10 and 1 1 ; and Figure 13 is a perspective view from underneath of the base of the cover shown in Figures 10 and 1 1 .
  • Figure 1 schematically depicts a shipping container 1 provided with forklift pockets 2 according to an embodiment of the invention.
  • the forklift pockets 2 are provided in pairs with a separation between them which corresponds with the separation been two forklift tangs of a forklift truck.
  • Two forklift pockets 2 are visible at one end of the shipping container 1 . These forklift pockets run along the entire length of the shipping container 1 .
  • Two further forklift pockets 2 are visible on one side of the shipping container 1 . These extend through to an opposite side of the shipping container.
  • the forklift pockets 2 allow a forklift truck to lift the shipping container from either end or from either side.
  • the tangs of the forklift truck may extend fully through the forklift pockets 2 and project out of the opposite side.
  • forklift truck tangs will not extend fully from one end of a shipping container to the other. However, this may occur if the shipping container is shorter than the conventional length, in which case the tangs may project out of the opposite end of the shipping container.
  • the forklift pockets 2 are fitted with covers 4.
  • the covers 4 are resiliently biased to a closed position which substantially closes the forklift pockets 2. This prevents or inhibits entry of objects into the forklift pockets.
  • the covers 4 may be pushed to an open position by tangs of a forklift truck. This allows the tangs of the forklift truck to enter the forklift pockets 2 in the usual way, and thus allows forklift transportation of the shipping container.
  • the covers 4, in addition to being moveable to allow forklift tangs to enter forklift pockets 2, are also moveable to allow forklift tangs to project through and out of forklift pockets.
  • the covers 4 can open inwardly to allow entry of a forklift tang into a forklift pocket, or can open outwardly to allow a forklift tang to project out of a forklift pocket.
  • the covers 4 prevent or inhibit objects from entering the forklift pockets 2, whilst at the same time allowing the shipping container 1 to be handled in a conventional manner by a forklift truck.
  • Figure 2 shows a cover 4 according to an embodiment of the invention in situ in a forklift pocket 2.
  • Figure 3 is a perspective view of the cover 4 and the forklift pocket 2.
  • the cover 4 comprises a base 6 and a resilient flap 8 which projects upwardly from the base.
  • the dimensions of the resilient flap 8 are such that it substantially closes the forklift pocket 2.
  • a gap exists between the resilient flap 8 and walls of the forklift pocket 2.
  • the gap may for example be less than 1 cm.
  • the gap may for example be greater than 2mm.
  • the gap may for example be between 3mm and 7mm, and may for example be around 5mm.
  • the gap is provided to avoid rubbing of the resilient flap 8 against walls of the forklift pocket 2 (such rubbing could inhibit closure of the flap following removal of a forklift tang).
  • the size of the gap takes into account the fact that over time some rust may accumulate on inner walls of the forklift pocket and may cause bubbling which moves the walls towards the resilient flap 8.
  • references to the resilient flap 8 being dimensioned to "substantially close" the forklift pocket 2 may be interpreted as meaning that the forklift pocket is sufficiently closed that an object such as a spanner or a screwdriver cannot easily fall out of the forklift pocket, or is sufficiently closed that an object such as an empty drinks can cannot be blown into the forklift pocket.
  • the term “substantially closed” is not intended to mean that there is no gap between the resilient flap 8 and walls of the forklift pocket 2. Instead, as shown in Figure 2, a gap may be present but the gap is sufficiently small to prevent most potentially harmful objects falling out of the forklift pocket 2, or to prevent potentially harmful objects being blown into the forklift pocket.
  • the size of the gap between the resilient flap 8 and the forklift pocket is thus a compromise between keeping the gap small to prevent objects falling out of the forklift pocket and keeping the gap sufficiently large to prevent rubbing of the resilient flap against walls of the forklift pocket.
  • the resilient flap 8 may for example have a height of around 145mm.
  • the height of the resilient flap 8 may be such that an upper end of the flap is adjacent to an upper surface of a conventionally dimensioned forklift pocket.
  • the resilient flap 8 may for example have a width of around 335mm.
  • the width of the resilient flap 8 may be such that sides of the flap are adjacent to sides of a conventionally dimensioned forklift pocket.
  • a conventionally dimensioned forklift pocket may for example have a height of 150mm and a width of 350mm.
  • a forklift pocket may have other dimensions, in which case the size of the resilient flap may be selected accordingly.
  • the resilient flap 8 may for example be formed from butyl rubber.
  • the butyl rubber may for example have 65° Scale A Shore hardness (+/- 5°).
  • the butyl rubber may for example have a thickness of around 6mm. Butyl rubber with this hardness and thickness is relatively inflexible and the flap 8 is thus resiliently biased to the closed position.
  • the resilient flap 8 is sufficiently stiff that it extends upwardly from the base 6 (i.e. it does not bend downwardly under its own weight). The force required to push the resilient flap 8 away from the closed position is considerable, and may be around 30N. Thus, an object such as an empty drinks can being blown along by the wind would not exert sufficient force to push open the resilient flap 8 and enter the forklift pocket 2.
  • the force applied by a tang of a forklift truck in normal operation is considerably greater than the force required to push the resilient flap 8 away from the closed position, and thus the forklift tang will enter the forklift pocket in the normal way.
  • the flap 8 is resiliently deformable in either direction, and thus allows passage of a forklift tang irrespective of the side of the flap upon which the forklift tang is incident. Therefore, the resilient flap 8 can be pushed open to accommodate entry of a forklift tang into a forklift pocket, and can be pushed open to accommodate projection of a forklift tang out of a forklift pocket. Because the flap 8 is resilient it returns to its closed configuration when the forklift tang is removed from the forklift pocket.
  • the base 6 acts as a lip which prevents an object from sliding out of the forklift pocket 2 (or reduces the likelihood of this happening). If the spanner or screwdriver were to hit the resilient flap 8 and not the base 6, then the flap 8 is sufficiently stiff to prevent the spanner or screwdriver from falling out of the forklift pocket (or reduce the likelihood of this happening).
  • a very heavy object might have sufficient weight to bend the resilient flap 8 to an open position, e.g. to apply a force in excess of around 30N. The object would then fall out of the forklift pocket. However, such a heavy object is unlikely to be accidentally left in a forklift pocket.
  • Providing the base 6 on the floor of the forklift pocket 2 is advantageous compared with providing the base for example on the ceiling of the forklift pocket.
  • the base 6 acts as a lip which may stop an object from sliding out of the forklift pocket 2.
  • the second reason arises from the fact that an object which is incident upon the resilient flap 8 is most likely to be incident upon it close to the base 6 if the base is on the floor of the forklift pocket. For example, if the object has slid along the forklift pocket floor and over the base 6 then it will be incident upon the resilient flap 8 close to the base.
  • the moments of force exerted by the object on the resilient flap 8 are significantly lower than the moments of force that would be exerted on the resilient flap if the object was incident upon the end of the resilient flap which is furthest from the base 6.
  • the object would be most likely to be incident upon the end of the resilient flap which is furthest from the base.
  • the moments of force exerted by that object would be significantly higher, and the resilient flap would be bent open more easily. That is, an object close to the floor of the forklift pocket which is not sufficiently heavy to bend open the resilient flap 8 when the base 6 is on the floor of the forklift pocket 2 may be sufficiently heavy to bend open the resilient flap when the base is on the ceiling of the forklift pocket.
  • the base 6 were to be provided on one side of the forklift pocket, then if the object were to be incident upon the resilient flap 8 on an opposite side of the forklift pocket it would bend open the resilient flap relatively easily (compared with the case if the base is on the floor of the forklift pocket).
  • the base 6 may be provided on the ceiling or a wall of the forklift pocket, it is advantageous to provide it on the floor of the forklift pocket.
  • the resilient flap may be formed from butyl rubber, any suitable resilient material may be used (e.g. any suitable elastomeric material, e.g. any suitable rubber). Silicon or neoprene (or some other synthetic rubber) may be used.
  • the resilient flap 8 should be sufficiently stiff that it projects upwardly from the base, but sufficiently flexible to allow insertion of forklift tangs.
  • Figure 4 shows the cover 4 viewed from one side in situ in a forklift pocket 2 of a shipping container. Also shown is part of a tang 16 of a forklift truck. The tang is shown twice, first at a central height (depicted by solid line 16) which allows straightforward entry of the tang into the forklift pocket, and second at a lower height (depicted by dashed line 16a) which will allow entry of the tang via deflection from the base 6. As will be appreciated from Figure 4, the base 6 occupies some volume in the forklift pocket 2, thus reducing the vertical height of the forklift pocket which is open to receive the forklift tang 16a.
  • the sloping face 18 acts as a deflector that upwardly deflects a forklift tang 16a which is incident upon it.
  • the usable vertical height of the forklift pocket 2 therefore substantially corresponds with the usable vertical height that would be available if the cover 4 was not present.
  • the sloping face 18 is formed from a material which is sufficiently strong to receive and deflect the forklift tang 16a without suffering significant damage.
  • the sloping face 18 may for example be formed from nylon 6-6 (also referred to as nylon 6,6).
  • the material may be provided with a lubricant which promotes interfacial sliding between the forklift tang 16a and the sloping face 18.
  • molybdenum disulphide powder may be added to nylon 6-6 when forming the sloping face. The molybdenum acts as a lubricant at the surface of the nylon 6-6.
  • the base 6, including the sloping face 18, may be formed from nylon 6-6 or any other suitable material.
  • the base may be formed from any suitable plastic, such as a suitable polyamide. Nylon or some other polyamide such as Kevlar may be used.
  • the base 6 may be provided with any suitable lubricant (e.g. molybdenum).
  • Figures 5 and 6 are perspective views from the front and rear of the cover 4.
  • Figure 7 is a perspective view from underneath of ends of the cover 4.
  • the base 6 comprises a sloping front face 18 and a vertical rear wall 24. Bottom ends of the sloping front face 18 and the vertical rear wall 24 are connected by a bottom surface 22, and upper ends of the sloping front face and the vertical rear wall are connected by an upper surface 26. Ends of the base 6 are closed by end walls 32.
  • the base 6 may be formed from a single piece of nylon 6-6 (or other suitable material), for example using injection moulding.
  • the base 6 includes five stepped bores 34 which are configured to receive bolts 36.
  • the bolts 36 are used to securely fasten the base 6 to the floor 38 of the forklift pocket 2. Other numbers of openings and bolts may be used to secure the base 6 to the forklift pocket 2.
  • the base may be provided with any suitable configuration which allows it to be securely attached to a wall of the forklift pocket 2.
  • a rod extends along the interior of the base 6, and is secured to end walls 32 of the base using bolts 40.
  • the rod may for example be formed from metal.
  • a clamping plate 42 is provided at an opposite surface of the resilient flap 8 from the rear wall 24 of the base 6.
  • Bolts 44 pass through openings in the clamping plate 42, pass through openings in the resilient flap 8 and the rear wall of the base 24, and are received in threaded bores in the rod. The bolts are tightened into the threaded bores, thereby securing the resilient flap 8 between the rear wall 24 and the clamping plate 34.
  • the bottom surface 22 of the base 6 is provided with channels 46 which extend from the front to the back of the base.
  • channels 46 are present and these separate the bottom surface into five parts. Other numbers of channels may be provided.
  • Grooves are 48 are cut into the sloping face 18, the grooves being aligned with the channels 46 in the bottom surface 22. This prevents outer ends of the channels 46 being closed by the sloping face 18.
  • the channels 46 allow liquid to flow out of the forklift pocket 2.
  • a worker may use a jet washer to clean a shipping container. The worker may push the resilient flap 8 open with the jet washer to allow water to enter the forklift pocket 2. Some water may enter the forklift pocket 2 via gaps between the resilient flap 8 and walls of the forklift pocket 2. Water which has entered the forklift pocket will flow back out of the forklift pocket 2 along the channels 46. The water may carry with it dirt and small pieces of debris, thereby cleaning these out of the forklift pocket 2.
  • the clamping plate 42 stops short of the upper surface 26 of the base 6.
  • the resilient flap 8 can bend away from the rear wall 24 of the base 6 (the flap 8 bends about the clamping plate 42). Because the clamping plate 42 stops short of the upper wall 26 of the base 6, the resilient flap 8 can bend out of the way of the forklift tang 16a, and is not compressed against the clamping plate 42 by the forklift tang 16a.
  • An upper end of the clamping plate 42 may stop short of the top surface 26 of the base 6 by a distance which is greater than the thickness of the resilient flap 8.
  • the resilient flap 8 may be fixed to the base 6 at a point below the upper surface of the base. This may be at least one flap thickness below the upper surface of the base. This is advantageous when a forklift tang 16a slides over the base 6 as it enters the forklift pocket 2 because it avoids the resilient flap 8 being compressed by the forklift tang (the flap bends out of the way). It is also advantageous in situations in which the shipping container is inverted during use (e.g. if the shipping container is a mud skip), because again it avoids the resilient flap 8 being compressed by the forklift tang.
  • upper corners 14 of the flap 8 have been cut at a 45° angle. This is done to reduce the likelihood of a corner of the flap 8 becoming stuck inside a corner of a forklift pocket 2.
  • the corners 14 are cut at 45° in Figure 2, the corners may be cut or rounded in any suitable manner.
  • a target 50 which has been provided on the resilient flap 8 of the cover 4.
  • the target 50 in this embodiment is a circle, but any suitable shape, pattern or other marking may be used.
  • the target 50 is a visual aid towards which the forklift truck driver can aim a tang of the forklift truck.
  • the target 50 may be provided in a colour which contrasts with the colour of the resilient flap 8. For example, if the resilient flap 8 is black then the target 50 may be white.
  • the target 50 may for example be formed using fluorescent paint.
  • the target 50 may be particularly useful if, for example, the resilient flap 8 has a colour which is similar to the colour of the shipping container such that the resilient flap is difficult to see.
  • the resilient flap 8 may be brightly coloured.
  • the resilient flap 8 may be orange (e.g. high visibility orange).
  • Figure 8 shows an embodiment of the cover 4 in perspective view seen from the rear.
  • the cover 4 generally corresponds with the cover shown in the preceding figures, but includes a deflection plate 60 which extends from the rear of the base 6.
  • the deflection plate 60 may for example be integrally formed with the base 6 (e.g. using injection moulding).
  • the deflection plate 60 may be formed from steel or any other suitable metal.
  • the deflection plate 60 comprises a first substantially horizontal portion 62 which extends from the base 6, a second portion 64 which slopes upwardly and away from the first portion 62, and a third portion 66 which slopes downwardly and away from the second portion 64.
  • a distal end 68 of the deflection plate tapers downwardly to an edge.
  • the configuration of the deflection plate 60 is such that the distal end 68 of the deflection plate 60 is adjacent to or in contact with the floor of a forklift pocket when the cover 4 is in situ.
  • the deflection plate 60 may be configured such that the distal end 68 of the deflection plate presses against the floor of the forklift pocket when it is in situ.
  • the deflection plate 60 In use, when a forklift tang travels towards the rear of the cover 4 and is in contact with or just above the floor of the forklift pocket, the deflection plate 60 deflects the forklift tang upwards before it reaches the flap 8.
  • the deflection is provided by the downwardly sloping third portion 66 of the deflection plate 60, and in addition may be provided by the tapering end 68 of the deflection plate.
  • the deflection plate 60 prevents the forklift tang from being incident upon the rear wall 24 of the base 6 or upon the clamping plate 42 (or associated bolts 44). Thus, damage which might be caused by the forklift tang is avoided.
  • Figure 9 shows in perspective view, seen from underneath, part of an alternative base 80 which may be used instead of the base 6 shown in preceding figures.
  • the base 80 is a solid block provided with openings configured to receive components.
  • the base 80 may be formed from nylon 6-6 or any other suitable material (e.g. using injection moulding). It may be provided with a lubricant such as molybdenum.
  • the base 80 has the same general exterior shape as the base 6 shown in preceding figures.
  • a through-bore 82 passes from a bottom surface 84 of the base 80 through to a sloping face (not visible) of the base.
  • the through-bore 82 is stepped and is dimensioned to receive a bolt (not shown) which may be used to secure the base 80 to a forklift pocket.
  • a rectangular opening 86 extends partway into the base 80 from the bottom surface 84 of the base.
  • a blind bore 88 with a circular cross-section extends into the base 80 from a rear surface 90 of the base and intersects with the rectangular opening 86.
  • a hexagon-headed nut (not shown) is inserted into the rectangular opening 86 such that it is aligned with the blind bore 88.
  • a bolt (not shown) to be inserted through the blind bore 88 and secured in the hexagon-headed nut (the nut is prevented from rotating by walls of the rectangular opening).
  • the bolt may be used to fix a flap and clamping plate to the base 80 in a manner which corresponds with that shown in Figure 4.
  • a square-headed nut or other suitable bolt receiving means may be used instead of the hexagon-headed nut.
  • a channel 94 is provided in the base 80. The channel allows fluid to flow out of the forklift pocket, for example during cleaning of a shipping container (in the manner described further above).
  • An advantage of the base 80 shown in Figure 9 over the base 6 shown in the preceding figures is that it does not require a bar to receive and secure the bolts which clamp the flap and clamping plate to the base. Since the bar is a bespoke component it is relatively costly.
  • the base 80 shown in Figure 9 uses standard hexagon-headed nuts (or other standard bolt receiving means) to perform the same function, thereby avoiding the requirement for a bespoke component and reducing the cost of the cover.
  • Embodiments of the invention may be retro-fitted to a shipping container by forming threaded bores in the floor of the forklift pocket 2 which receive bolts 36.
  • the bolts 36 secure the base to the floor of the forklift pocket 2 (see figure 4).
  • a clamping plate 42 is used to fix the resilient flap 8 to the base 6, 80 in the illustrated embodiments, a clamping plate is not essential and the resilient flap may be secured to the base by any suitable securing means.
  • FIGS 10 - 13 show an alternative embodiment of the cover 4.
  • the cover 4 provides the same general functionality as covers shown in the preceding Figures, but has a stronger construction and is thus more resilient to impact of forklift truck tangs.
  • the cover 4 comprises a resilient flap 108 which extends upwardly from a base 106.
  • a deflection plate 160 extends from the rear of the base 106.
  • the resilient bias of the resilient flap is such that it substantially closes a forklift pocket to which it is fitted.
  • the base 106 extends either side of the resilient flap 108.
  • the base 106 is formed as a single piece rather than an assembly of pieces. This is advantageous because it improves the strength of the base and thus its resistance to damage.
  • the base 106 may be formed from steel, other metal or other suitable material. The steel may for example be wear-resistant steel.
  • cavities 107 are provided in the base.
  • the cavities 107 are separated by ribs 109 which extend in a direction generally perpendicular to the resilient flap 108.
  • the ribs 109 increase the structural rigidity of the base 106 and improve its resistance to impact damage.
  • the combination of cavities and ribs reduces the weight and expense of the base 106 without reducing the strength of the base below a level at which significant damage due to an impact might be expected.
  • the base is provided with a slot 1 1 1 which is configured to receive the resilient flap 108.
  • the slot 1 1 1 has an inverted T-shape in cross-section.
  • the slot 1 1 1 has a closed end 1 13 and an open end 1 15 (see Figure 12) .
  • the resilient flap 108 is provided with a T-shaped foot which is received in the slot 1 1 1 .
  • the interface between the T-shaped foot of the resilient flap 108 and the T-shaped slot 1 1 1 strongly secures the resilient flap to the base, thus preventing the flap from becoming detached from the base during use.
  • the T-shaped arrangement provides increased engagement between the resilient flap 108 and the base 106 (compared with other illustrated embodiments) and thus reduces the risk of the resilient flap being separated from the base during use.
  • the slot may have some other cross-sectional shape, with the foot of the resilient flap being provided with a corresponding shape.
  • the foot of the resilient flap 8 is pushed into the slot 1 1 1 through the open end 1 15.
  • the resilient flap 108 is pushed up against the closed end 1 13 of the slot 1 1 1 and is then glued into position.
  • the resilient flap 108 cannot slide sideways and out of the base because it is prevented from doing so by the walls of the forklift pocket.
  • a small amount of movement of the resilient flap 108 along the slot 1 1 1 would be possible if the flap was not glued in place. This small amount of movement is undesirable because it could lead to the side of the resilient flap 108 which is at the open end 1 15 of the slot 1 1 1 coming into contact with a wall of the forklift pocket.
  • the closed end 1 13 of the slot 11 1 may provide a separation between the resilient flap 108 and the forklift pocket wall of, for example, around 5mm when the resilient flap is pushed up against the closed end.
  • the width of the resilient flap 108 may be such that a corresponding gap is provided between the opposite side of the resilient flap and the forklift pocket wall when the resilient flap is in this position.
  • the deflection plate 160 may also be made from steel, which may be wear-resistant steel. The deflection plate 160 is glued into a recess 161 formed in a bottom surface of the base 106.
  • the recess 161 has dimensions which correspond with the dimensions of one end of the deflection plate 160, as may be best seen in Figure 1 1 .
  • the height of the recess 161 corresponds with the thickness of the deflection plate 160.
  • the deflection plate 160 has an apex 163 which is higher than the highest part of the base 106.
  • the deflection plate 160 will act to upwardly deflect a forklift truck tang passing from right to left in Figure 10 such that it does not impact upon the base 106.
  • a distal end of the deflection plate 160 is not glued to the floor of the forklift pocket but instead is free to move. This gives the deflection plate 160 some energy-absorbing resilience.
  • a sloping face 1 18 is provided on an outwardly facing side of the base 106. As explained further above in connection with other embodiments, the sloping face will push a forklift tang upwards such that it slides into the forklift pocket. A further advantage of the sloping face 1 18 (and the sloping face of other embodiments) is that it prevents a worker from leaving an object on top of the base 106, since the object will slide down the sloping face 1 18 and fall off the base. A sloping face 1 19 is also provided on an inwardly facing side of the base 106.
  • this sloping face 1 19 is lower in order to provide space into which the resilient flap 108 can bend when it is pushed open by a forklift tang pushing on its outer face.
  • the sloping inner face 1 19 of the base 106 thus provides some protection to the base 106.
  • the deflection plate 160 may be expected to deflect a forklift tang such that it is not incident upon the sloping inner face 1 19 of the base 106.
  • Assembly and installation of the cover 4 shown in figures 10 - 13 may be as follows: the resilient flap 108 is inserted into the slot 1 1 1 and pushed up against the closed end 1 13 of the slot. The resilient flap 108 is then glued in place in the slot 1 1 1 .
  • the deflection plate 160 is glued into the recess 161 in the base 106.
  • the base 106 and deflection plate 160 are then glued to the floor of a forklift pocket.
  • the glue may for example be structural adhesive.
  • An outermost edge of the base 106 is welded to the opening of the forklift pocket.
  • the weld 121 provides a strong join between the base 106 and the forklift pocket which is resilient to impact of a forklift truck tang.
  • the weld 121 may be a continuous weld or may be a series of spaced apart welds (this is commonly referred as a stitch weld).
  • the embodiment shown in Figures 10 - 13 does not include channels corresponding to the channels 46, 94 provided in other embodiments. However, a gap between ends of the base 106 and walls of the forklift pocket may be sufficient to allow water and small pieces of debris to flow out of the forklift pocket (e.g. during cleaning). Alternatively, channels which correspond with the channels shown in other embodiments may be provided.
  • An advantage of the embodiment shown in Figures 10 - 13 over other illustrated embodiments is that it does not include bolts or other relatively small fixings which could shear away during use and then subsequently pose a hazard to workers during movement of a shipping container.
  • two or more resilient flaps may extend from the base.
  • the two or more resilient flaps may together substantially close the forklift pocket.
  • two resilient flaps may be provided side by side and arranged to substantially close the forklift pocket.
  • a base is provided on one side wall of the forklift pocket and a base is provided on the opposite side wall of the forklift pocket.
  • a resilient flap extends from each base to the centre of the forklift pocket. This pair of resilient flaps closes the forklift pocket.
  • This embodiment may include features described above in connection with other embodiments. More than two bases and associated resilient flaps may be provided.
  • the embodiment illustrated in Figure 1 is a dry goods shipping container, other embodiments of the invention may comprise other forms of shipping container (e.g. mud skip, waste transportation unit, container for transporting a chemical tank, drum basket, etc).
  • a shipping container may also be referred to as an offshore container.
  • the DNV Standard for Certification No. 2.7-1 for Offshore Containers identifies at Guidance Note 2 the problem of loose items being retained in forklift pockets which could subsequently fall out during lifting operations.
  • the Guidance Note suggests that openings should be provided in the bottom of forklift pockets to reduce this risk.
  • openings in the bottom of forklift pockets may be damaged by forklift trucks.
  • the invention provides an alternative solution to the problem of falling objects whilst avoiding the disadvantages which arise from providing openings in the bottom of forklift pockets.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

A cover for a forklift pocket of a shipping container, the cover comprising a base and a resilient flap which is secured to the base, the resilient flap extending from the base and being configured to substantially close the forklift pocket.

Description

Cover for a Forklift Pocket of a Shipping Container
The present application relates to a shipping container and to a cover for covering a forklift pocket of the shipping container.
Shipping containers have been used for many years to transport goods. They are provided in standard sizes which allow them to be transported using appropriately configured ships, trucks or railway carriages. A shipping container may be transferred, for example, from a ship to an oil rig using a crane. A shipping container may also be transferred between storage locations using a forklift truck. In order to facilitate transport by forklift truck each shipping container is provided with forklift pockets which are configured to receive forklift tangs (which may also be referred to as prongs) of the forklift truck.
A problem associated with forklift pockets is that an object may enter the forklift pocket and may present a hazard at some future point in time. For example, a worker may put a spanner or screwdriver in a forklift pocket for convenience when working nearby and then forget to remove it. In another example, an object such as an empty drinks can could be blown by wind into the forklift pocket. During subsequent transfer of the shipping container (e.g. from a ship to an oil rig) the object may be blown out of the forklift pocket by wind (or may fall out due to tilting of the shipping container). This could cause injury to a worker. It is an object of the present invention to address the above problem or another problem associated with known forklift pockets.
According to a first aspect of the invention there is provided a cover for a forklift pocket of a shipping container, the cover comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and being configured to substantially close the forklift pocket.
The cover reduces the likelihood of objects entering the forklift pocket. In addition, the cover prevents an object from falling out of the forklift pocket (or reduces the likelihood of the object falling out of the forklift pocket).
The at least one resilient flap may be sufficiently stiff that it projects upwardly from the base. The at least one resilient flap may be sufficiently stiff to withstand a force of up to around 30N applied against it.
The at least one resilient flap may be sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed.
The at least one resilient flap may be held in a slot provided in the base. The slot may be T-shaped in cross-section and a foot of the at least one resilient flap held in the slot may be T-shaped in cross-section.
The slot may be open at one end and closed at an opposite end. The base may be a single piece of material.
The base may be a single piece of steel.
A plate may extend from one side of the base, the plate being configured to deflect a forklift tang away from the base.
The base may be provided with a sloping face.
The base may be provided with an additional sloping face on an opposite side.
The base may extend either side of the at least one resilient flap.
The base may be higher on one side of the at least one resilient flap than on the other side of the at least one resilient flap, the difference in height being greater than the thickness of the at least one resilient flap.
Corners of the at least one resilient flap distal to the base may be cut or rounded.
A target may be provided on the at least one resilient flap. The at least one resilient flap may be brightly coloured. The at least one resilient flap may be orange.
The at least one resilient flap may be configured to substantially close the forklift pocket in combination with the base.
According to a second aspect of the invention there is provided a shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and substantially closing the forklift pocket.
The base may be secured to the floor of the forklift pocket and the at least one resilient flap may extend upwardly from the base.
There may be a gap between the at least one resilient flap and walls of the forklift pocket.
The gap may be less than 1 cm.
The gap may be around 5mm.
The base may be secured to the floor of the forklift pocket and be provided with a sloping outer face which slopes upwardly in the direction of the at least one resilient flap.
An outer edge of the sloping outer face may be welded to the shipping container.
The at least one resilient flap may be sufficiently stiff to withstand a force of up to around 30N applied against it.
The at least one resilient flap may be sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed. According to a third aspect of the invention there is provided a shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a plurality of bases each provided with at least one resilient flap, the resilient flaps extending from the bases and substantially closing the forklift pocket.
The cover may comprise two bases each of which is provided with at least one resilient flap.
The second and third aspects of the invention may include features mentioned above in connection with the first aspect of the invention.
Embodiments of the invention will now be described by way of example only, with reference to the accompanying figures, in which:
Figure 1 schematically depicts a shipping container with forklift pockets that have been fitted with covers according to an embodiment of the invention;
Figures 2 and 3 depicts a cover and forklift pocket in more detail;
Figure 4 depicts the cover and forklift pocket viewed from one side together with a forklift tang of a forklift truck;
Figures 5 - 7 are perspective views of the cover;
Figure 8 is a perspective view of a cover according to an alternative embodiment of the invention;
Figure 9 is a perspective view of part of a base of a cover according to an alternative embodiment of the invention;
Figure 10 is a cross-sectional perspective view of a cover and forklift pocket according to an alternative embodiment of the invention;
Figure 1 1 is a cross-sectional perspective view of the cover shown in Figure 10;
Figure 12 is a perspective view from above of the base of the cover shown in Figures 10 and 1 1 ; and Figure 13 is a perspective view from underneath of the base of the cover shown in Figures 10 and 1 1 .
Figure 1 schematically depicts a shipping container 1 provided with forklift pockets 2 according to an embodiment of the invention. The forklift pockets 2 are provided in pairs with a separation between them which corresponds with the separation been two forklift tangs of a forklift truck. Two forklift pockets 2 are visible at one end of the shipping container 1 . These forklift pockets run along the entire length of the shipping container 1 . Two further forklift pockets 2 are visible on one side of the shipping container 1 . These extend through to an opposite side of the shipping container. The forklift pockets 2 allow a forklift truck to lift the shipping container from either end or from either side.
When the shipping container 1 is lifted from one side rather than from the end, the tangs of the forklift truck may extend fully through the forklift pockets 2 and project out of the opposite side. In general, forklift truck tangs will not extend fully from one end of a shipping container to the other. However, this may occur if the shipping container is shorter than the conventional length, in which case the tangs may project out of the opposite end of the shipping container.
The forklift pockets 2 are fitted with covers 4. The covers 4 are resiliently biased to a closed position which substantially closes the forklift pockets 2. This prevents or inhibits entry of objects into the forklift pockets. The covers 4 may be pushed to an open position by tangs of a forklift truck. This allows the tangs of the forklift truck to enter the forklift pockets 2 in the usual way, and thus allows forklift transportation of the shipping container. The covers 4, in addition to being moveable to allow forklift tangs to enter forklift pockets 2, are also moveable to allow forklift tangs to project through and out of forklift pockets. That is, the covers 4 can open inwardly to allow entry of a forklift tang into a forklift pocket, or can open outwardly to allow a forklift tang to project out of a forklift pocket. Thus, the covers 4 prevent or inhibit objects from entering the forklift pockets 2, whilst at the same time allowing the shipping container 1 to be handled in a conventional manner by a forklift truck.
Figure 2 shows a cover 4 according to an embodiment of the invention in situ in a forklift pocket 2. Figure 3 is a perspective view of the cover 4 and the forklift pocket 2. The cover 4 comprises a base 6 and a resilient flap 8 which projects upwardly from the base. The dimensions of the resilient flap 8 are such that it substantially closes the forklift pocket 2. As may be seen from Figure 2, a gap exists between the resilient flap 8 and walls of the forklift pocket 2. The gap may for example be less than 1 cm. The gap may for example be greater than 2mm. The gap may for example be between 3mm and 7mm, and may for example be around 5mm. The gap is provided to avoid rubbing of the resilient flap 8 against walls of the forklift pocket 2 (such rubbing could inhibit closure of the flap following removal of a forklift tang). The size of the gap takes into account the fact that over time some rust may accumulate on inner walls of the forklift pocket and may cause bubbling which moves the walls towards the resilient flap 8.
References to the resilient flap 8 being dimensioned to "substantially close" the forklift pocket 2 may be interpreted as meaning that the forklift pocket is sufficiently closed that an object such as a spanner or a screwdriver cannot easily fall out of the forklift pocket, or is sufficiently closed that an object such as an empty drinks can cannot be blown into the forklift pocket. The term "substantially closed" is not intended to mean that there is no gap between the resilient flap 8 and walls of the forklift pocket 2. Instead, as shown in Figure 2, a gap may be present but the gap is sufficiently small to prevent most potentially harmful objects falling out of the forklift pocket 2, or to prevent potentially harmful objects being blown into the forklift pocket. The size of the gap between the resilient flap 8 and the forklift pocket is thus a compromise between keeping the gap small to prevent objects falling out of the forklift pocket and keeping the gap sufficiently large to prevent rubbing of the resilient flap against walls of the forklift pocket.
The resilient flap 8 may for example have a height of around 145mm. The height of the resilient flap 8 may be such that an upper end of the flap is adjacent to an upper surface of a conventionally dimensioned forklift pocket. The resilient flap 8 may for example have a width of around 335mm. The width of the resilient flap 8 may be such that sides of the flap are adjacent to sides of a conventionally dimensioned forklift pocket. A conventionally dimensioned forklift pocket may for example have a height of 150mm and a width of 350mm. A forklift pocket may have other dimensions, in which case the size of the resilient flap may be selected accordingly.
The resilient flap 8 may for example be formed from butyl rubber. The butyl rubber may for example have 65° Scale A Shore hardness (+/- 5°). The butyl rubber may for example have a thickness of around 6mm. Butyl rubber with this hardness and thickness is relatively inflexible and the flap 8 is thus resiliently biased to the closed position. The resilient flap 8 is sufficiently stiff that it extends upwardly from the base 6 (i.e. it does not bend downwardly under its own weight). The force required to push the resilient flap 8 away from the closed position is considerable, and may be around 30N. Thus, an object such as an empty drinks can being blown along by the wind would not exert sufficient force to push open the resilient flap 8 and enter the forklift pocket 2. However, the force applied by a tang of a forklift truck in normal operation is considerably greater than the force required to push the resilient flap 8 away from the closed position, and thus the forklift tang will enter the forklift pocket in the normal way. The flap 8 is resiliently deformable in either direction, and thus allows passage of a forklift tang irrespective of the side of the flap upon which the forklift tang is incident. Therefore, the resilient flap 8 can be pushed open to accommodate entry of a forklift tang into a forklift pocket, and can be pushed open to accommodate projection of a forklift tang out of a forklift pocket. Because the flap 8 is resilient it returns to its closed configuration when the forklift tang is removed from the forklift pocket.
It might be possible for a worker to push the resilient flap 8 open and place an object such as a spanner or screwdriver in the forklift pocket 2. If the spanner or screwdriver is left in the pocket then it will be retained by the cover 4 in the forklift pocket during subsequent transfer of the shipping container. For example, during transfer of the shipping container from a ship to an oil rig wind may move the spanner or screwdriver to one end of the forklift pocket 2 (or this may happen due to tilting of the shipping container) . However, the spanner or screwdriver will then hit the base 6 of the cover 4 (and possibly also the flap 8), and will thereby be prevented from falling out of the forklift pocket 2. Thus, potential injury to a worker will be avoided. The base 6 acts as a lip which prevents an object from sliding out of the forklift pocket 2 (or reduces the likelihood of this happening). If the spanner or screwdriver were to hit the resilient flap 8 and not the base 6, then the flap 8 is sufficiently stiff to prevent the spanner or screwdriver from falling out of the forklift pocket (or reduce the likelihood of this happening). A very heavy object might have sufficient weight to bend the resilient flap 8 to an open position, e.g. to apply a force in excess of around 30N. The object would then fall out of the forklift pocket. However, such a heavy object is unlikely to be accidentally left in a forklift pocket. Providing the base 6 on the floor of the forklift pocket 2 is advantageous compared with providing the base for example on the ceiling of the forklift pocket. This is for two reasons. The first reason is that, as explained above, the base 6 acts as a lip which may stop an object from sliding out of the forklift pocket 2. The second reason arises from the fact that an object which is incident upon the resilient flap 8 is most likely to be incident upon it close to the base 6 if the base is on the floor of the forklift pocket. For example, if the object has slid along the forklift pocket floor and over the base 6 then it will be incident upon the resilient flap 8 close to the base. The moments of force exerted by the object on the resilient flap 8 are significantly lower than the moments of force that would be exerted on the resilient flap if the object was incident upon the end of the resilient flap which is furthest from the base 6. If the base 6 were to be provided on the ceiling of the forklift pocket 2 then the object would be most likely to be incident upon the end of the resilient flap which is furthest from the base. The moments of force exerted by that object would be significantly higher, and the resilient flap would be bent open more easily. That is, an object close to the floor of the forklift pocket which is not sufficiently heavy to bend open the resilient flap 8 when the base 6 is on the floor of the forklift pocket 2 may be sufficiently heavy to bend open the resilient flap when the base is on the ceiling of the forklift pocket. Similarly, if the base 6 were to be provided on one side of the forklift pocket, then if the object were to be incident upon the resilient flap 8 on an opposite side of the forklift pocket it would bend open the resilient flap relatively easily (compared with the case if the base is on the floor of the forklift pocket). Thus, although the base 6 may be provided on the ceiling or a wall of the forklift pocket, it is advantageous to provide it on the floor of the forklift pocket.
Although the resilient flap may be formed from butyl rubber, any suitable resilient material may be used (e.g. any suitable elastomeric material, e.g. any suitable rubber). Silicon or neoprene (or some other synthetic rubber) may be used. The resilient flap 8 should be sufficiently stiff that it projects upwardly from the base, but sufficiently flexible to allow insertion of forklift tangs.
Figure 4 shows the cover 4 viewed from one side in situ in a forklift pocket 2 of a shipping container. Also shown is part of a tang 16 of a forklift truck. The tang is shown twice, first at a central height (depicted by solid line 16) which allows straightforward entry of the tang into the forklift pocket, and second at a lower height (depicted by dashed line 16a) which will allow entry of the tang via deflection from the base 6. As will be appreciated from Figure 4, the base 6 occupies some volume in the forklift pocket 2, thus reducing the vertical height of the forklift pocket which is open to receive the forklift tang 16a. This potential disadvantage is mitigated by the presence of a sloping face 18 on an outwardly facing side of the base 6. The sloping face 18 acts as a deflector that upwardly deflects a forklift tang 16a which is incident upon it. Thus, if the forklift tang has a low height 16a as it approaches the forklift pocket 2, the tang is pushed upwards by the sloping face 18 and thereby slides into the forklift pocket. The usable vertical height of the forklift pocket 2 therefore substantially corresponds with the usable vertical height that would be available if the cover 4 was not present. The sloping face 18 is formed from a material which is sufficiently strong to receive and deflect the forklift tang 16a without suffering significant damage. The sloping face 18 may for example be formed from nylon 6-6 (also referred to as nylon 6,6). The material may be provided with a lubricant which promotes interfacial sliding between the forklift tang 16a and the sloping face 18. For example, molybdenum disulphide powder may be added to nylon 6-6 when forming the sloping face. The molybdenum acts as a lubricant at the surface of the nylon 6-6.
The base 6, including the sloping face 18, may be formed from nylon 6-6 or any other suitable material. For example, the base may be formed from any suitable plastic, such as a suitable polyamide. Nylon or some other polyamide such as Kevlar may be used. The base 6 may be provided with any suitable lubricant (e.g. molybdenum).
The construction of the cover 4 will now be described in more detail with reference to Figures 4 to 7. Figures 5 and 6 are perspective views from the front and rear of the cover 4. Figure 7 is a perspective view from underneath of ends of the cover 4. The base 6 comprises a sloping front face 18 and a vertical rear wall 24. Bottom ends of the sloping front face 18 and the vertical rear wall 24 are connected by a bottom surface 22, and upper ends of the sloping front face and the vertical rear wall are connected by an upper surface 26. Ends of the base 6 are closed by end walls 32. The base 6 may be formed from a single piece of nylon 6-6 (or other suitable material), for example using injection moulding. The base 6 includes five stepped bores 34 which are configured to receive bolts 36. The bolts 36 are used to securely fasten the base 6 to the floor 38 of the forklift pocket 2. Other numbers of openings and bolts may be used to secure the base 6 to the forklift pocket 2. In general, the base may be provided with any suitable configuration which allows it to be securely attached to a wall of the forklift pocket 2.
A rod (not visible) extends along the interior of the base 6, and is secured to end walls 32 of the base using bolts 40. The rod may for example be formed from metal. A clamping plate 42 is provided at an opposite surface of the resilient flap 8 from the rear wall 24 of the base 6. Bolts 44 pass through openings in the clamping plate 42, pass through openings in the resilient flap 8 and the rear wall of the base 24, and are received in threaded bores in the rod. The bolts are tightened into the threaded bores, thereby securing the resilient flap 8 between the rear wall 24 and the clamping plate 34.
The bottom surface 22 of the base 6 is provided with channels 46 which extend from the front to the back of the base. Four channels 46 are present and these separate the bottom surface into five parts. Other numbers of channels may be provided. Grooves are 48 are cut into the sloping face 18, the grooves being aligned with the channels 46 in the bottom surface 22. This prevents outer ends of the channels 46 being closed by the sloping face 18. The channels 46 allow liquid to flow out of the forklift pocket 2. Thus, for example, a worker may use a jet washer to clean a shipping container. The worker may push the resilient flap 8 open with the jet washer to allow water to enter the forklift pocket 2. Some water may enter the forklift pocket 2 via gaps between the resilient flap 8 and walls of the forklift pocket 2. Water which has entered the forklift pocket will flow back out of the forklift pocket 2 along the channels 46. The water may carry with it dirt and small pieces of debris, thereby cleaning these out of the forklift pocket 2.
Referring to Figure 4, it can be seen that the clamping plate 42 stops short of the upper surface 26 of the base 6. As a result of this construction, when a forklift tang 16a is in contact with the base 6 on entering the forklift pocket 2, the resilient flap 8 can bend away from the rear wall 24 of the base 6 (the flap 8 bends about the clamping plate 42). Because the clamping plate 42 stops short of the upper wall 26 of the base 6, the resilient flap 8 can bend out of the way of the forklift tang 16a, and is not compressed against the clamping plate 42 by the forklift tang 16a. An upper end of the clamping plate 42 may stop short of the top surface 26 of the base 6 by a distance which is greater than the thickness of the resilient flap 8. In general, the resilient flap 8 may be fixed to the base 6 at a point below the upper surface of the base. This may be at least one flap thickness below the upper surface of the base. This is advantageous when a forklift tang 16a slides over the base 6 as it enters the forklift pocket 2 because it avoids the resilient flap 8 being compressed by the forklift tang (the flap bends out of the way). It is also advantageous in situations in which the shipping container is inverted during use (e.g. if the shipping container is a mud skip), because again it avoids the resilient flap 8 being compressed by the forklift tang.
Referring again to Figure 2, it may be seen that upper corners 14 of the flap 8 have been cut at a 45° angle. This is done to reduce the likelihood of a corner of the flap 8 becoming stuck inside a corner of a forklift pocket 2. Although the corners 14 are cut at 45° in Figure 2, the corners may be cut or rounded in any suitable manner.
Also visible in Figure 2 is a target 50 which has been provided on the resilient flap 8 of the cover 4. The target 50 in this embodiment is a circle, but any suitable shape, pattern or other marking may be used. The target 50 is a visual aid towards which the forklift truck driver can aim a tang of the forklift truck. The target 50 may be provided in a colour which contrasts with the colour of the resilient flap 8. For example, if the resilient flap 8 is black then the target 50 may be white. The target 50 may for example be formed using fluorescent paint. The target 50 may be particularly useful if, for example, the resilient flap 8 has a colour which is similar to the colour of the shipping container such that the resilient flap is difficult to see. It is also advantageous compared with conventional open forklift pockets, which are often dark and may be difficult to see in some circumstances (e.g. if they are provided in a shipping container that has a dark colour and/or the shipping container is stacked on top of several other shipping containers).
In an alternative approach, instead of being provided with a target 50 the resilient flap 8 may be brightly coloured. For example, the resilient flap 8 may be orange (e.g. high visibility orange).
Figure 8 shows an embodiment of the cover 4 in perspective view seen from the rear. The cover 4 generally corresponds with the cover shown in the preceding figures, but includes a deflection plate 60 which extends from the rear of the base 6. The deflection plate 60 may for example be integrally formed with the base 6 (e.g. using injection moulding). The deflection plate 60 may be formed from steel or any other suitable metal.
The deflection plate 60 comprises a first substantially horizontal portion 62 which extends from the base 6, a second portion 64 which slopes upwardly and away from the first portion 62, and a third portion 66 which slopes downwardly and away from the second portion 64. A distal end 68 of the deflection plate tapers downwardly to an edge. The configuration of the deflection plate 60 is such that the distal end 68 of the deflection plate 60 is adjacent to or in contact with the floor of a forklift pocket when the cover 4 is in situ. The deflection plate 60 may be configured such that the distal end 68 of the deflection plate presses against the floor of the forklift pocket when it is in situ.
In use, when a forklift tang travels towards the rear of the cover 4 and is in contact with or just above the floor of the forklift pocket, the deflection plate 60 deflects the forklift tang upwards before it reaches the flap 8. The deflection is provided by the downwardly sloping third portion 66 of the deflection plate 60, and in addition may be provided by the tapering end 68 of the deflection plate. The deflection plate 60 prevents the forklift tang from being incident upon the rear wall 24 of the base 6 or upon the clamping plate 42 (or associated bolts 44). Thus, damage which might be caused by the forklift tang is avoided.
Figure 9 shows in perspective view, seen from underneath, part of an alternative base 80 which may be used instead of the base 6 shown in preceding figures. The base 80 is a solid block provided with openings configured to receive components. The base 80 may be formed from nylon 6-6 or any other suitable material (e.g. using injection moulding). It may be provided with a lubricant such as molybdenum.
The base 80 has the same general exterior shape as the base 6 shown in preceding figures. A through-bore 82 passes from a bottom surface 84 of the base 80 through to a sloping face (not visible) of the base. The through-bore 82 is stepped and is dimensioned to receive a bolt (not shown) which may be used to secure the base 80 to a forklift pocket. A rectangular opening 86 extends partway into the base 80 from the bottom surface 84 of the base. A blind bore 88 with a circular cross-section extends into the base 80 from a rear surface 90 of the base and intersects with the rectangular opening 86. A hexagon-headed nut (not shown) is inserted into the rectangular opening 86 such that it is aligned with the blind bore 88. This allows a bolt (not shown) to be inserted through the blind bore 88 and secured in the hexagon-headed nut (the nut is prevented from rotating by walls of the rectangular opening). The bolt may be used to fix a flap and clamping plate to the base 80 in a manner which corresponds with that shown in Figure 4. A square-headed nut or other suitable bolt receiving means may be used instead of the hexagon-headed nut. A channel 94 is provided in the base 80. The channel allows fluid to flow out of the forklift pocket, for example during cleaning of a shipping container (in the manner described further above).
Although only one end of the base 80 is shown in Figure 9, it will be appreciated that the features shown in Figure 9 repeat along the base in a manner which generally corresponds to that shown, for example, in Figure 5.
An advantage of the base 80 shown in Figure 9 over the base 6 shown in the preceding figures is that it does not require a bar to receive and secure the bolts which clamp the flap and clamping plate to the base. Since the bar is a bespoke component it is relatively costly. The base 80 shown in Figure 9 uses standard hexagon-headed nuts (or other standard bolt receiving means) to perform the same function, thereby avoiding the requirement for a bespoke component and reducing the cost of the cover.
Embodiments of the invention may be retro-fitted to a shipping container by forming threaded bores in the floor of the forklift pocket 2 which receive bolts 36. The bolts 36 secure the base to the floor of the forklift pocket 2 (see figure 4). Although a clamping plate 42 is used to fix the resilient flap 8 to the base 6, 80 in the illustrated embodiments, a clamping plate is not essential and the resilient flap may be secured to the base by any suitable securing means.
Figures 10 - 13 show an alternative embodiment of the cover 4. The cover 4 provides the same general functionality as covers shown in the preceding Figures, but has a stronger construction and is thus more resilient to impact of forklift truck tangs. The cover 4 comprises a resilient flap 108 which extends upwardly from a base 106. A deflection plate 160 extends from the rear of the base 106. As shown in Figure 10, the resilient bias of the resilient flap is such that it substantially closes a forklift pocket to which it is fitted. The base 106 extends either side of the resilient flap 108.
The base 106 is formed as a single piece rather than an assembly of pieces. This is advantageous because it improves the strength of the base and thus its resistance to damage. The base 106 may be formed from steel, other metal or other suitable material. The steel may for example be wear-resistant steel. In order to reduce the weight and metal content (and thus cost) of the base 106, cavities 107 are provided in the base. The cavities 107 are separated by ribs 109 which extend in a direction generally perpendicular to the resilient flap 108. The ribs 109 increase the structural rigidity of the base 106 and improve its resistance to impact damage. Thus, the combination of cavities and ribs reduces the weight and expense of the base 106 without reducing the strength of the base below a level at which significant damage due to an impact might be expected.
The base is provided with a slot 1 1 1 which is configured to receive the resilient flap 108. The slot 1 1 1 has an inverted T-shape in cross-section. The slot 1 1 1 has a closed end 1 13 and an open end 1 15 (see Figure 12) . The resilient flap 108 is provided with a T-shaped foot which is received in the slot 1 1 1 . The interface between the T-shaped foot of the resilient flap 108 and the T-shaped slot 1 1 1 strongly secures the resilient flap to the base, thus preventing the flap from becoming detached from the base during use. The T-shaped arrangement provides increased engagement between the resilient flap 108 and the base 106 (compared with other illustrated embodiments) and thus reduces the risk of the resilient flap being separated from the base during use. In alternative arrangements the slot may have some other cross-sectional shape, with the foot of the resilient flap being provided with a corresponding shape.
During assembly of the cover 4, the foot of the resilient flap 8 is pushed into the slot 1 1 1 through the open end 1 15. The resilient flap 108 is pushed up against the closed end 1 13 of the slot 1 1 1 and is then glued into position. When the base 106 is located in a forklift pocket (as shown in Figure 10) the resilient flap 108 cannot slide sideways and out of the base because it is prevented from doing so by the walls of the forklift pocket. A small amount of movement of the resilient flap 108 along the slot 1 1 1 would be possible if the flap was not glued in place. This small amount of movement is undesirable because it could lead to the side of the resilient flap 108 which is at the open end 1 15 of the slot 1 1 1 coming into contact with a wall of the forklift pocket. This would inhibit movement of the resilient flap 108. Gluing the resilient flap 108 in place in the slot 1 1 1 prevents this from happening. The closed end 1 13 of the slot 11 1 may provide a separation between the resilient flap 108 and the forklift pocket wall of, for example, around 5mm when the resilient flap is pushed up against the closed end. The width of the resilient flap 108 may be such that a corresponding gap is provided between the opposite side of the resilient flap and the forklift pocket wall when the resilient flap is in this position. The deflection plate 160 may also be made from steel, which may be wear-resistant steel. The deflection plate 160 is glued into a recess 161 formed in a bottom surface of the base 106. The recess 161 has dimensions which correspond with the dimensions of one end of the deflection plate 160, as may be best seen in Figure 1 1 . The height of the recess 161 corresponds with the thickness of the deflection plate 160. As a result, as may be best seen in Figure 10, when the base 106 is in place on the floor of the forklift pocket there is no gap between the deflection plate 160 and the floor of the forklift pocket (in the region beneath the base). The deflection plate 160 has an apex 163 which is higher than the highest part of the base 106. Thus, the deflection plate 160 will act to upwardly deflect a forklift truck tang passing from right to left in Figure 10 such that it does not impact upon the base 106. A distal end of the deflection plate 160 is not glued to the floor of the forklift pocket but instead is free to move. This gives the deflection plate 160 some energy-absorbing resilience.
A sloping face 1 18 is provided on an outwardly facing side of the base 106. As explained further above in connection with other embodiments, the sloping face will push a forklift tang upwards such that it slides into the forklift pocket. A further advantage of the sloping face 1 18 (and the sloping face of other embodiments) is that it prevents a worker from leaving an object on top of the base 106, since the object will slide down the sloping face 1 18 and fall off the base. A sloping face 1 19 is also provided on an inwardly facing side of the base 106. The height of this sloping face 1 19 is lower in order to provide space into which the resilient flap 108 can bend when it is pushed open by a forklift tang pushing on its outer face. The sloping inner face 1 19 of the base 106 thus provides some protection to the base 106. In practice, the deflection plate 160 may be expected to deflect a forklift tang such that it is not incident upon the sloping inner face 1 19 of the base 106.
Assembly and installation of the cover 4 shown in figures 10 - 13 may be as follows: the resilient flap 108 is inserted into the slot 1 1 1 and pushed up against the closed end 1 13 of the slot. The resilient flap 108 is then glued in place in the slot 1 1 1 . The deflection plate 160 is glued into the recess 161 in the base 106. The base 106 and deflection plate 160 are then glued to the floor of a forklift pocket. The glue may for example be structural adhesive. An outermost edge of the base 106 is welded to the opening of the forklift pocket. The weld 121 provides a strong join between the base 106 and the forklift pocket which is resilient to impact of a forklift truck tang. Because the base 106 is glued to the forklift pocket floor, upward rotation of the base about the weld 121 which might otherwise occur during welding is prevented. The weld 121 may be a continuous weld or may be a series of spaced apart welds (this is commonly referred as a stitch weld). The embodiment shown in Figures 10 - 13 does not include channels corresponding to the channels 46, 94 provided in other embodiments. However, a gap between ends of the base 106 and walls of the forklift pocket may be sufficient to allow water and small pieces of debris to flow out of the forklift pocket (e.g. during cleaning). Alternatively, channels which correspond with the channels shown in other embodiments may be provided.
An advantage of the embodiment shown in Figures 10 - 13 over other illustrated embodiments is that it does not include bolts or other relatively small fixings which could shear away during use and then subsequently pose a hazard to workers during movement of a shipping container.
Although in illustrated embodiments of the invention only one resilient flap extends from the base, two or more resilient flaps may extend from the base. The two or more resilient flaps may together substantially close the forklift pocket. For example, two resilient flaps may be provided side by side and arranged to substantially close the forklift pocket.
In an alternative embodiment (not illustrated) a base is provided on one side wall of the forklift pocket and a base is provided on the opposite side wall of the forklift pocket. A resilient flap extends from each base to the centre of the forklift pocket. This pair of resilient flaps closes the forklift pocket. This embodiment may include features described above in connection with other embodiments. More than two bases and associated resilient flaps may be provided. Although the embodiment illustrated in Figure 1 is a dry goods shipping container, other embodiments of the invention may comprise other forms of shipping container (e.g. mud skip, waste transportation unit, container for transporting a chemical tank, drum basket, etc).
A shipping container may also be referred to as an offshore container. The DNV Standard for Certification No. 2.7-1 for Offshore Containers identifies at Guidance Note 2 the problem of loose items being retained in forklift pockets which could subsequently fall out during lifting operations. The Guidance Note suggests that openings should be provided in the bottom of forklift pockets to reduce this risk. However, as identified in the Guidance Note, such openings in the bottom of forklift pockets may be damaged by forklift trucks. The invention provides an alternative solution to the problem of falling objects whilst avoiding the disadvantages which arise from providing openings in the bottom of forklift pockets.

Claims

CLAIMS:
1 . A cover for a forklift pocket of a shipping container, the cover comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and being configured to substantially close the forklift pocket.
2. The cover of claim 1 , wherein the at least one resilient flap is sufficiently stiff that it projects upwardly from the base.
3. The cover of claim 2, wherein the at least one resilient flap is sufficiently stiff to withstand a force of up to around 30N applied against it.
4. The cover of any preceding claim, wherein the at least one resilient flap is sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed.
5. The cover of any preceding claim, wherein the at least one resilient flap is held in a slot provided in the base.
6. The cover of claim 5, wherein the slot is T-shaped in cross-section and a foot of the at least one resilient flap held in the slot is T-shaped in cross-section.
7. The cover of claim 5 or claim 6, wherein the slot is open at one end and closed at an opposite end.
8. The cover of any preceding claim, wherein the base is a single piece of material.
9. The cover of claim 8, wherein the base is a single piece of steel.
10. The cover of any preceding claim, wherein a plate extends from one side of the base, the plate being configured to deflect a forklift tang away from the base.
11 . The cover of any preceding claim, wherein the base is provided with a sloping face.
12. The cover of claim 1 1 , wherein the base is provided with an additional sloping face on an opposite side.
13. The cover of any preceding claim, wherein the base extends either side of the at least one resilient flap.
14. The cover of claim 13, wherein the base is higher on one side of the at least one resilient flap than on the other side of the at least one resilient flap, the difference in height being greater than the thickness of the at least one resilient flap.
15. The cover of any preceding claim, wherein corners of the at least one resilient flap distal to the base are cut or rounded.
16. The cover of any preceding claim, wherein a target is provided on the at least one resilient flap.
17. The cover of any preceding claim, wherein the at least one resilient flap is brightly coloured.
18. The cover of any preceding claim, wherein the at least one resilient flap is configured to substantially close the forklift pocket in combination with the base.
19. A shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a base and at least one resilient flap which is secured to the base, the at least one resilient flap extending from the base and substantially closing the forklift pocket.
20. The shipping container of claim 19, wherein the base is secured to the floor of the forklift pocket and the at least one resilient flap extends upwardly from the base.
21 . The shipping container of claim 19 or claim 20, wherein there is a gap between the at least one resilient flap and walls of the forklift pocket.
22. The shipping container of claim 21 , wherein the gap is less than 1 cm.
23. The shipping container of claim 22, wherein the gap is around 5mm.
24. The shipping container of any of claims 19 to 23, wherein the base is secured to the floor of the forklift pocket and is provided with a sloping outer face which slopes upwardly in the direction of the at least one resilient flap.
25. The shipping container of claim 24, wherein an outer edge of the sloping outer face is welded to the shipping container.
26. The shipping container of any of claims 19 to 25, wherein the at least one resilient flap is sufficiently stiff to withstand a force of up to around 30N applied against it.
27. The shipping container of any of claims 19 to 26, wherein the at least one resilient flap is sufficiently flexible that it will be deflected by a forklift tang of a forklift truck, and sufficiently resilient to return to its initial orientation after the forklift tang has been removed.
28. A shipping container comprising a plurality of forklift pockets, each forklift pocket being fitted with a cover comprising a plurality of bases each provided with at least one resilient flap, the resilient flaps extending from the bases and substantially closing the forklift pocket.
29. The shipping container of claim 28, wherein the cover comprises two bases each of which is provided with a resilient flap.
EP16700511.5A 2015-01-09 2016-01-08 Cover for a forklift pocket of a shipping container Withdrawn EP3242846A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1500317.1A GB2520442B (en) 2015-01-09 2015-01-09 Cover for a forklift pocket of a shipping container
PCT/GB2016/050037 WO2016110709A1 (en) 2015-01-09 2016-01-08 Cover for a forklift pocket of a shipping container

Publications (1)

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EP3242846A1 true EP3242846A1 (en) 2017-11-15

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EP16700511.5A Withdrawn EP3242846A1 (en) 2015-01-09 2016-01-08 Cover for a forklift pocket of a shipping container

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US (1) US20170369237A1 (en)
EP (1) EP3242846A1 (en)
AU (1) AU2016205894A1 (en)
GB (1) GB2520442B (en)
WO (1) WO2016110709A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017010689B4 (en) * 2017-11-17 2021-11-25 Iqs Holding Gmbh Container for the transport of a vehicle
SE542909C2 (en) * 2018-12-14 2020-09-15 Scania Cv Ab Electronic pallet and method for selectively blocking fork openings of an electronic pallet
CN115319858A (en) * 2022-09-01 2022-11-11 无锡吉兴汽车声学部件科技有限公司 Water cutting jig forklift hole sealing structure for passenger car

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2685398A (en) * 1950-04-14 1954-08-03 Maxwell D King Material containing or supporting means
US2873935A (en) * 1957-06-12 1959-02-17 Nat Wooden Pallet Manufacturer Pallet with draft-barrier
IE63802B1 (en) * 1990-02-14 1995-06-14 Hannah S Allport Weather excluder
DE4403150A1 (en) * 1994-02-02 1995-08-03 Juergens Walter Pallet for transporting and stacking
US20080251403A1 (en) * 2007-04-13 2008-10-16 Ole Henrik Nielsen Storage container, pocket end opening cover thereof and method of forming the storage container
CN201172524Y (en) * 2008-02-22 2008-12-31 南通中集罐式储运设备制造有限公司 Container with fork slot and fork slot cover device
US8671848B2 (en) * 2011-08-04 2014-03-18 Wayne Randall Pallet protector device and method
US8459911B1 (en) * 2011-09-09 2013-06-11 The United States Of America As Represented By The Secretary Of The Army Cargo locking mechanisms and structures

Also Published As

Publication number Publication date
GB2520442B (en) 2015-10-07
WO2016110709A1 (en) 2016-07-14
AU2016205894A1 (en) 2017-08-10
GB201500317D0 (en) 2015-02-25
GB2520442A (en) 2015-05-20
HK1210752A1 (en) 2016-05-06
US20170369237A1 (en) 2017-12-28

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