Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
  • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
  • B65G69/003—Restraining movement of a vehicle at a loading station using means not being part of the vehicle

Definitions

• This invention relates to a system for supporting and maintaining a cargo-support platform of a commercial vehicle or trailer at a desired level for loading or unloading.
• Movable supports are subject to human forgetfullness, misalignment and instability on uneven or soft surfaces.
• An object of this invention is to provide a system which resolves or avoids the difficulties just described without requiring a dedicated internal area of the warehouse, which is capable of being operated with a wide range of vehicles and which is simple and relatively inexpensive to install and use to support and maintain a cargo-support platform of a commercial vehicle or trailer at a desired level for loading or unloading.
• Some of the systems for loading and unloading vehicles that are used are intended to tackle other problems.
• wheel chocks, chains, dock to vehicle crash bar hooking devices, key systems or warning lights are used to inhibit movement of the vehicle in a horizontal direction during loading or unloading, such movement being due to driver error, (the driver forgetting to apply the parking brake or driving off before loading or unloading has been finished), to a trailer moving forward inadvertently or having its front end lift from the ground, or to the momentum of a vehicle loading truck as it impacts the vehicle cargo-support platform.
• Chains and chocks can lock up due to loading movement.
• Dock to vehicle crash bar hooking devices have the disadvantage that they allow vertical float of the cargo-support platform relative to the loading point and their position can create problems with tail-lift vehicles.
• forward movement inhibiting means as defined by claim 2 in a system for supporting and maintaining a cargo-support platform at a desired level for loading or unloading which embodies this invention.
• the actuating means are activated by the vehicle as it enters the loading bay and a particular embodiment for achieving that is claimed in claim 17.
• Other preferred features of the system are defined by the other claims.
• FIG. 1 is a diagrammatic illustration of the rear end of a commercial vehicle in a loading bay into which it has been backed, one form of apparatus in which the present invention is embodied being shown installed in the loading bay in the collapsed or inoperative position it occupies on the road surface of the loading bay prior to reversal of a vehicle over it into the loading bay and driving of the vehicle over it from the loading bay, a partially extended condition of the apparatus being shown chain dotted;
• Figure 2 is a view similar to figure 1, with the apparatus shown in figure 1 extended beyond the condition shown chain dotted in figure 1 to engage part of it with the front of the crash bar of the vehicle, the apparatus being shown chain dotted further extended into contact with the underside of the platform of the vehicle which is supported by the vehicle suspension;
• Figure 3 is a view similar to figures 1 and 2 with the apparatus fully extended to raise the platform off the vehicle suspension into contact with a bridging plate mounted at the front edge of the working surface of the loading bay;
• Figure 4 is a view similar to figure 2 but showing the apparatus modified to include a vertical screw brace for mechanically locking the apparatus in its extended condition;
• Figure 5 is a diagrammatic representation of another form of apparatus in which the present invention is embodied, which comprises two separate parts shown installed in the loading bay and in their collapsed or inactive positions which they occupy on the road surface of the loading bay prior to reversal of a vehicle over them into the loading bay;
• Figure 6 is a view similar to figure 5 but with the rear end of a commercial vehicle shown in the loading bay into which it has been backed, the apparatus being shown installed and set in its operational mode for loading or unloading the vehicle;
• Figure 7 is a view on arrow A in figure 6 of the apparatus.
• Figure 8 is a view similar to figure 5 of part of a further form of apparatus in which the present invention is embodied which is shown in full lines in the collapsed or inoperable position it occupies on the road surface of the loading bay prior to reversal of a vehicle over it into the loading bay, the apparatus being shown chain dotted installed and set in its operational mode for loading or unloading a vehicle (not shown); and
• Figure 9 is a view similar to figure 7 of the apparatus shown in figure 8.
• Figure 1 shows the rear portion of an unladen flat topped lorry or trailer 11 which has been backed into a loading bay 12 for loading.
• the lorry or trailer 11 comprises a cargo-support platform 13, rear wheels 14, a chassis and a depending crash bar 16 at its rear end.
• the loading bay 12 has a working surface 17 which is raised relative to the road surface 18 on which the lorry or trailer 11 is backed into the loading bay 12.
• a bridging plate 19 is mounted at the edge of the working surface 17 so that it projects beyond that edge.
• the bridging plate 19 is at the top of structure fitted to the face of the wall of the loading bay 12 that depends from the edge of the working surface 17 to the road surface 18. That structure incorporates a sliding buffer unit 20 which forms the face against which the rear end of the vehicle or trailer 11 is backed as shown in Figure 1.
• the bridging plate 19 projects beyond the buffer unit 20 so that it projects over the rear edge portion of the cargo-support platform 13 of the vehicle or trailer 11.
• a sensor is embedded in the working surface 17 under the bridging plate 19 and is adapted to sense distortion or deflection of the bridging plate 19 due to an application of an upwards force on the underside of the projecting portion of the bridging plate 19.
• the sliding buffer unit 20 comprises two pairs of side-by-side vertical rods 21 (of which only one is visible in figure 1) which are mounted on the wall of the loading bay 12 that extends between the working surface 17 and the road surface 18.
• Two buffer pads 22 (of which only one is visible in figure 1) are slidably mounted, one on each pair of rods 21.
• Each buffer pad 22 rests upon two compression springs 23, each of which is wound around the respective rod. 21 and which reacts against a flange 24 at the bottom of the respective rod.
• each buffer pad 22 is urged to an intermediate location near the centre of the respective rods 21 either by the respective springs 23 or by gravity.
• FIG. 1 The remainder of the apparatus in which the present invention is embodied is shown generally at 25 in figure 1. It comprises a hydraulically operated, interlinked, multi-arm vehicle jack and is mounted on the road surface between the rear wheels 14 and the end wall of the loading bay 12. It comprises a ground plate 26, a pedestal 27 pivotally mounted by its bottom on the ground plate 26, a primary arm 28 which is pivotally mounted at one end to the top of the pedestal 27 and a secondary arm 29 which is hinged to the primary arm 28 at its other end.
• An hydraulic cylinder 30 has its cylinder body pivotally mounted on the ground plate 26 and its ram hinged to the primary arm 28.
• Another hydraulic cylinder 31 has its cylinder body pivotally mounted on the ground plate 26 and its ram hinged to the secondary arm 29. Chassis support pads 32 are pivotally mounted to the end of the secondary arm 29 remote from the primary arm 28.
• the system is provided with suitable operating means such a manual lever, an electrical control system including its own power pack activatable and controllable by the operation of push buttons to control extension and contraction of the hydraulic cylinders; the vehicle stop .mechanism including the buffer unit 20 or means operable by the reversing vehicle.
• suitable operating means such a manual lever, an electrical control system including its own power pack activatable and controllable by the operation of push buttons to control extension and contraction of the hydraulic cylinders; the vehicle stop .mechanism including the buffer unit 20 or means operable by the reversing vehicle.
• the leveling jack apparatus 25 Prior to reversal of the vehicle or trailer 11 into the loading bay 12 the leveling jack apparatus 25 is in its collapsed state as shown in full lines in figure 1, the hydraulic cylinder 30 being contracted and the hydraulic cylinder 31 being extended. In that condition the whole of the levelling jack apparatus 25 is below the level of the bottom of the crash bar 16. Hence as the vehicle or trailer 11 is reversed into the loading bay 12, the bottom of the crash bar 16
• the vehicle or trailer 11 is backed into the loading bay until its rear end abuts the buffer pads 22. Operation of the apparatus 25 is then initiated by the means provided and that operation comprises the following sequence of steps.
• the hydraulic cylinder 31 is contracted to pull the secondary arm 29 towards the ground plate 26. This causes the two arms 28 and 29 to crab and the pedestal 27 to seat upon the ground plate 26 as shown chain dotted in figure 1.
• the cylinder 30 is raised by that movement and is then extended to pivot the primary arm 28 up and over centre to the position shown in full lines in figure 2 in which it abuts the front of the crash bar 15.
• the primary arm 28 is held in that position by the extended hydraulic cylinder 30 and restricts horizontal movement of the vehicle or trailer 11 out of the loading bay 12.
• the hydraulic cylinder 31 is raised by that movement from its position shown chain dotted in figure 1 to its position shown in full lines in figure 2, whereafter it is extended to lift the secondary arm 29 to bring the chassis support pads 32 into contact with the underside of the chassis as shown chain-dotted in Figure 2. Further extension of the hydraulic cylinder 31 raises the cargo-support platform 13 until it is brought into abutment with the underside of the bridging plate 19 (see Figure 3) at which there is substantial, alignment between the working surface 17 and the surface of the support platform 13. Abutment of the cargo-support platform 13 with the bridging plate 19 will be sensed by the sensor which will respond by initiating cessation of further extension of the hydraulic cylinders 30 and 31.
• hydraulic cylinders 30 and 31 prop the cargo-support surface so that any tendancy for the aatter to sag as it is loaded is countered.
• the sliding buffer pads 22 slide up their respective rods 21 thus prevently frictional damage to the vehicle or bumper.
• Pad braces 33 may be positioned as shown in figure 4, if required.
• the apparatus 25 When the vehicle has been loaded or unloaded and is to be driven away from the loading bay, the apparatus 25 is contracted, the sequence of operation being the reverse of that just described.
• chassis support pads 32 can be fitted with various adaptor plates to vary heights, spread loading, mate with the chassis and increase or decrease friction between the pad and the underside of the vehicle chassis members by mechanical or other means.
• An interlinked multi-arm jack arrangement comprising just the primary and secondary arms and two hydraulic cylinders, and not including the pivotally mounted pedestal could be used instead of the apparatus 25 shown in Figures 1 to 4.
• the primary arm of such an alternative arrangement would be pivotally mounted on the ground plate coaxially with the hydraulic cylinder that has its rod pinned to the secondary arm.
• the other hydraulic cylinder, which has its rod pinned to the primary arm would be pivotally mounted on the ground plate at a location on the ground plate which is further from the end wall of the loading bay than is the pivot mounting of the primary arm.
• the secondary arm would be pinned to the rod of the respective hydraulic cylinder by a pin in a slot connection which allows for some limited relative movement between the rod and the secondary arm.
• FIG. 5 shows another form of apparatus in which this invention is embodied.
• the apparatus comprises a levelling jack arrangement 42 and a vehicle stop arm arrangement 43 which are mounted on separate bases 44 and 45 on the road surface 18 so as to be between the rear wheel of a vehicle which is backed into the loading bay 12 and the end wall of the loading bay 12.
• FIGS 5 to 7 show the levelling jack arrangement 42 comprises a spaced pair of hydraulic cylinders 46 and 47 which are mounted by the closed ends of their cylinder bodies on a base plate 48 which is pivotally mounted on the respective base 44 by its long edge which is further from the end wall of the loading bay 12.
• a beam 49 bridges the rams of the two hydraulic cylinders 46 and 47.
• a striker arm 51 is fixed at one end to the base plate 48 near the pivot axis thereof and projects between the two cylinders 46 and 47 towards the end wall of the loading bay 12.
• the striker arm 51 is at an acute angle to the base plate 28.
• the length of the striker arm 51 is such that its upper end is below the bottom of the crash bar 16 when the hydraulic cylinders 46 and 47 are upright as shown in Figures 6 and 7, but is sufficient for it to project to a height which is greater than the clearance between the bottom of the crash bar 16 and the road surface 18, when the bridge structure formed by the hydraulic cylinders 46 and 47 and the beam 49 is pivoted to its inoperative position in which the cylinders 46 and 47 lie upon the base 44, as shown in Figure 5.
• the vehicle stop arm arrangement 43 comprises a cranked arm 52 which is pivotally mounted in a clevis 53 which in turn is mounted on the base 45.
• a hydraulic cylinder 54 is pivotally mounted by the closed end of its cylinder body on the base 45 and has its rod pinned to the cranked arm 52. Contraction of the hydraulic cylinder 54 pivots the cranked arm 52 down to the base 45, as shown in Figure 5. Extension of the hydraulic cylinder 54 raises the cranked arm into abutment with the forward edge of the crash bar 16 as shown in Figure 6.
• the length of the cranked arm 52 is sufficient to ensure that the forward edge of the crash bar 16 abuts it even when the cargo-support platform 13 of the vehicle or trailer 11 is in abutment with the underside of the bridging plate 19.
• the levelling jack arrangement 42 and the vehicle stop arm arrangement 43 Prior to reversal of the vehicle or trailer 11 into the loading bay 12, the levelling jack arrangement 42 and the vehicle stop arm arrangement 43 are in their collapsed positions shown in Figure 5. In that condition the whole of the levelling jack arrangement 42, except the striker arm 51, and the whole of the vehicle stop arm arrangement 43 are below the level of the bottom of the crash bar 16. Hence, as the vehicle or trailer 11 is reversed into the loading bay 12, the bottom of the crash bar 16 passes over the beam 49 and the cylinders 46 and 47, into abutment with the striker arm 51.
• the vehicle or trailer 11 is backed up into contact with the buffer unit 20, as shown in Figure 1, passing over the collapsed vehicle stop arm arrangement 43 in so doing.
• the vehicle brakes are applied.
• the system is then operated, either manually by a lever, electrically through a power pack, or automatically in reaction to the reversing movement of the vehicle, in consequence of contact with the striker arm 51 or abutment with the buffer unit 20, so as to extend the hydraulic cylinders 46 and 47, to bring the beam 49 into contact with the underside of the chassis, and to extend the hydraulic cylinder 54 to bring the cranked arm 52 up against the crash bar 16.
• the hydraulic cylinders 46 and 47 extend to raise the chassis and take the weight thereof from the vehicle suspension.
• the cylinders 46 and 47 continue to extend raising the cargo-support platform 13 until it is brought into abutment with the underside of the bridging plate 19 at which there is substantial alignment between the working surface 17 and the surface of the support platform 13. Abutment of the cargo-support platform 13 with the bridging plate 19 will be sensed by the sensor which will respond by initiating cessation of further extension of the hydraulic cylinders 46 and 47. It will be understood that the hydraulic cylinders 46 and 47 prop the cargo-support surface so that any tendancy for the latter to sag as it is loaded is countered.
• Operation of the invention is not limited to unladen vehicles.
• the steps prior to loading are also carried out prior to unloading a loaded vehicle.
• the jack arrangement 42 is supporting the vehicle chassis instead of the vehicle suspension, there will not be a tendancy for the cargo-support platform to rise as it is unloaded.
• the hydraulic jacks 46, 47 and 54 would be contracted, and thus the cranked arm 52 would be lowered, before the vehicle or trailer 11 is driven out of the loading bay 12.
• the bridge portion of the levelling jack arrangement 42 would be deflected to its collapsed position by the crash bar 16 as the vehicle or trailer
• the hydraulic jacks 46, 47 and 54 would be connected into a hydraulic control system which incorporates a pump or other suitable source of hydraulic fluid pressure, and suitable control valves associated with the sensor in the bridging plate 19 and the actuating means previously mentioned.
• the two hydraulic cylinders 46 and 47 would be interlinked so that the beam 49 tends to level the platform 13.
• a flow compensating valve may be provided in the connection to those two cylinders 46 and 47.
• levelling jack arrangement 42 does not have to be used in conjunction with the vehicle stop arm arrangement 43 : any other suitable device for restraining undesired movement of the vehicle or trailer 11 away from the end wall of the loading bay could be used.
• the striker arm 51 passes below the crash bar 16 when the levelling jack arrangement 42 is raised and thus serves as a stop which cooperates with the crash bar 16 to inhibit undesired collapsing of the levelling jack arrangement 42 before the vehicle is driven out of the loading bay 12.
• FIGs 8 and 9 illustrate another form of apparatus in which this invention is embodied which, like the form shown in figures 5 to 7, comprises a levelling jack arrangement 62 and a vehicle stop arm arrangement 63 which are separate one from the other, but the base 65 of the latter extends through a gap in the angled base plate 68 and over the base 64 of the former.
• the pivoted base plate 68 of the levelling jack arrangement 62 being in two spaced parts, there are two similar striker arms 71, each mounted on a respective pivoted base plate part as can be seen from Figure 9.
• the construction of the remainder of the levelling jack arrangement 62 is the same as for the corresponding parts of the arrangement 42 as is its operation.
• the vehicle s t op arm arrangement 63 has a straight stop arm 72 in place of the cranked arm 52 of the arrangement 43.
• the stop arm 72 has a generally C-shaped cross-section and conveniently comprises two opposed lengths of channel section joined together on one side by a rectangular plate.
• the flanges of the channel sections are running surfaces for rollers 75 (see Figure 9) which are fitted to the end of the ram of the hydraulic cylinder 74.
• the end of the ram of the hydraulic cylinder 74 is constrained for rectilinear movement in the stop arm 72, which is pivotally mounted at one end.
• the stop arm arrangement 63 can be moved back and forth relative to the levelling jack arrangement 62 during installation in a loading bay to suit the particular application.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Auxiliary Methods And Devices For Loading And Unloading (AREA)
• Loading Or Unloading Of Vehicles (AREA)

Applications Claiming Priority (6)

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• 1988
  • 1988-04-21 WO PCT/GB1988/000307 patent/WO1988008403A1/en not_active Application Discontinuation
  • 1988-04-21 EP EP19880903320 patent/EP0368853A1/en not_active Ceased
  • 1988-04-21 JP JP50334888A patent/JPH02503187A/ja active Pending
  • 1988-04-21 AU AU15963/88A patent/AU1596388A/en not_active Abandoned
• 1989
  • 1989-10-20 DK DK520889A patent/DK520889A/da not_active Application Discontinuation

Non-Patent Citations (1)

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