Container handling vehicle

Abstract

To provide a suitable container handling vehicle.SOLUTION: This container handling vehicle is for lifting a storage container from a lower skeletal structure. The vehicle comprises: a container lifting assembly; and a vehicle body. The container lifting assembly includes a lifting frame, a lifting shaft assembly, and a plurality of lifting bands. The lifting bands are connected to the lifting frame and the lifting shaft assembly. The vehicle body includes a side wall and a cantilever section. The cantilever section extends from the upper end of the side wall. The container lifting assembly is characterized by a lifting frame guide assembly. A first guide device is provided on the lifting frame. A second guide device is slidably connected to the side wall. The first and second guide devices are arrayed so as to interact with each other when the lifting frame is brought adjacent to the side wall so as to limit horizontal movement of the lifting frame with respect to the vehicle body.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a container handling vehicle or robot for loading storage containers from a storage system, and to a storage system comprising such a vehicle. [Background technology]

[0002] FIG. 1 discloses a typical prior art automated warehouse system 1 with a framework structure 100, and FIGS. 2-4 disclose two different prior art container handling vehicles 201, 301 suitable for operating on such a system 1.

[0003] The skeleton structure 100 comprises upright members 102, horizontal members 103, and a storage volume comprising storage columns 105 arranged in rows between the upright members 102 and the horizontal members 103. In these storage columns 105, storage containers 106, also known as receptacles, are stacked one on top of the other to form stacks 107. The members 102, 103 may typically consist of metal, for example extruded aluminum profiles.

[0004] The framework structure 100 of the automated warehouse system 1 includes a rail system 108 arranged across the top of the framework structure 100, on which a plurality of container handling vehicles 201, 301 are operated to lift storage containers 106 from, lower storage containers 106 into, and transport storage containers 106 up the storage columns 105. The rail system 108 includes a first set of parallel rails 110 arranged to guide movement of the container handling vehicles 201, 301 in a first direction X across the top of the framework structure 100, and a second set of parallel rails 111 arranged perpendicular to the first set of rails 110 for guiding movement of the container handling vehicles 201, 301 in a second direction Y that is perpendicular to the first direction X. Containers 106 stored in columns 105 are accessed by container handling vehicles through access openings 112 in rail system 108. Container handling vehicles 201, 301 can move laterally above storage columns 105, i.e., in a plane that is parallel to the horizontal XY plane.

[0005] The uprights 102 of the skeletal structure 100 may be used to guide the storage containers during lifting and lowering of the containers out of and into the columns 105. The stacks 107 of containers 106 are typically freestanding.

[0006] Each prior art container handling vehicle 201, 301 includes a body 201a, 301a and first and second sets of wheels 201b, 301b, 201c, 301c, which allow lateral movement of the container handling vehicle 201, 301 in the X and Y directions, respectively. In Figures 2 and 3, two wheels in each set are fully visible. The first set of wheels 201b, 301b are arranged to engage two adjacent rails of the first set of rails 110, and the second set of wheels 201c, 301c are arranged to engage two adjacent rails of the second set of rails 111. At least one of the sets of wheels 201b, 301b, 201c, 301c can be raised and lowered so that the first set of wheels 201b, 301b and / or the second set of wheels 201c, 301c can be engaged with a respective set of rails 110, 111 at any one time.

[0007] Each prior art container handling vehicle 201, 301 also includes a lifting device 2 (shown in FIG. 4 ) for vertical transportation of the storage container 106, e.g., lifting the storage container 106 from the storage column 105 and lowering the storage container 106 therein. The lifting device 2 includes a lifting frame 3 having one or more gripping / engaging devices 4 adapted to engage with the storage container 106 and guide pins 304 for correct positioning of the lifting frame 3 relative to the storage container 106. The lifting frame 3 can be lowered from the vehicle 201, 301 by lifting bands 5 so that the position of the lifting frame relative to the vehicle 201, 301 can be adjusted in a third direction Z, orthogonal to the first direction X and the second direction Y.

[0008] The lifting frame 3 (not shown) of the container handling vehicle 201 in Figure 2 is located within the vehicle body 201a. The advantage of this arrangement is that horizontal movement of the lifting frame 3 is prevented by interaction with the inner surface of the vehicle body when the lifting frame enters the vehicle body due to vehicle movement and acceleration.

[0009] Conventionally, and for purposes of this application, Z=1 identifies the top layer of a storage container, i.e., the layer immediately below rail system 108; Z=2 identifies the second layer below rail system 108; Z=3 identifies the third layer, and so on. In the exemplary prior art disclosed in FIG. 1, Z=8 identifies the lowest bottom layer of a storage container. Similarly, X=1...n and Y=1...n identify the position of each storage column 105 in the horizontal plane. Consequently, using the Cartesian coordinate system X, Y, Z shown in FIG. 1 as an example, the storage container identified as 106' in FIG. 1 may be said to occupy storage location X=10, Y=2, Z=3. Container handling vehicles 201, 301 may be said to travel in layer Z=0, and each storage column 105 may be identified by its X and Y coordinates.

[0010] The storage volume of the skeleton structure 100 is often referred to as a grid 104, and the possible storage locations within this grid are referred to as storage cells. Each storage column may be identified by a position in the X and Y directions, while each storage cell may be identified by a container number in the X, Y, and Z directions.

[0011] Each prior art container handling vehicle 201, 301 includes a storage compartment or space for receiving and containing the storage container 106 as it is transported across the rail system 108. The storage space may include a cavity centrally arranged within the vehicle body 201a, as shown in FIG. 2 and as described, for example, in WO 2015 / 193278 A1, the contents of which are incorporated herein by reference.

[0012] 3 shows an alternative configuration of a container handling vehicle 301 with a cantilever structure. Such a vehicle is described in detail, for example, in No. 317366, the contents of which are also incorporated herein by reference.

[0013] 2 may have a footprint covering an area with dimensions in the X and Y directions generally equal to the lateral extent of the storage column 105, as described, for example, in WO 2015 / 193278 A1, the contents of which are incorporated herein by reference. As used herein, the term "lateral" may mean "horizontal."

[0014] Alternatively, the central hollow container handling vehicle 101 may have a footprint that is greater than the lateral area defined by the storage columns 105, for example as disclosed in WO2014 / 090684A1.

[0015] Rail system 108 typically includes rails with grooves along which vehicle wheels run. Alternatively, the rails may include upwardly protruding elements, and the vehicle wheels may include flanges to prevent derailment. These grooves and upwardly protruding elements are collectively known as tracks. Each rail may include one track, or each rail may include two parallel tracks.

[0016] WO2018146304 (the contents of which are incorporated herein by reference) illustrates a typical configuration of a rail system 108, comprising rails and parallel tracks in both the X and Y directions.

[0017] In the skeleton structure 100, the majority of the columns 105 are storage columns 105, i.e., columns 105 where storage containers 106 are stored in stacks 107. However, some columns 105 may have other purposes. In FIG. 1 , columns 119 and 120 are such special-purpose columns used by container handling vehicles 201, 301 to unload and / or load storage containers 106 so that they can be accessed from outside the skeleton structure 100 or transported to an access station (not shown) where they can be transferred out of or into the skeleton structure 100. Within the art, such locations are typically referred to as "ports," and the columns in which the ports are located may be referred to as "port columns" 119, 120. Transport to the access station may be in any direction, horizontal, diagonal, and / or vertical. For example, storage containers 106 may be installed in random or dedicated columns 105 within the framework structure 100, then loaded by any container handling vehicle and transported to port columns 119, 120 for further transport to an access station. Note that the term "diagonal" refers to the transportation of storage containers 106 having a general transport orientation somewhere between horizontal and vertical.

[0018] In FIG. 1, the first port column 119 may be, for example, a dedicated loading port column where container handling vehicles 201, 301 may unload storage containers 106 to be transported to an access or transfer station, and the second port column 120 may be a dedicated loading port column where container handling vehicles 201, 301 may load storage containers 106 being transported from an access or transfer station.

[0019] An access station may typically be a picking station or stockpiling station where product items are removed from or placed into storage containers 106. At a picking or stockpiling station, the storage containers 106 are typically not removed from the automated storage system 1, but once accessed, are placed back into the backbone structure 100. Ports can also be used to transfer storage containers to another storage facility (e.g., to another backbone structure or to another automated storage system), to a transport vehicle (e.g., a train or lorry), or to a production facility.

[0020] A conveyor system comprising conveyors is typically employed to transport storage containers between the port columns 119, 120 and the access stations.

[0021] If the port columns 119, 120 and the access stations are located at different levels, the conveyor system may include a lifting device with a vertical component for transporting the storage containers 106 vertically between the port columns 119, 120 and the access stations.

[0022] The conveyor system may be arranged to transfer storage containers 106 between different skeletal structures, for example as described in WO2014 / 075937A1 (the contents of which are incorporated herein by reference).

[0023] 1 is to be accessed, one of the container handling vehicles 201, 301 is commanded to retrieve the target storage container 106 from its location and transport it to the unloading port column 119. This operation involves moving the container handling vehicle 201, 301 to a location above the storage column 105 in which the target storage container 106 is located, and using a lifting device (not shown) of the container handling vehicle 201, 301 to retrieve the storage container 106 from the storage column 105 and transport the storage container 106 to the unloading port column 119. If the target storage container 106 is located deep within the stack 107, i.e., one or more other storage containers 106 are positioned above the target storage container 106, the operation also involves temporarily moving the above-positioned storage container prior to raising the target storage container 106 from the storage column 105. This step, sometimes referred to within the art as "digging," may be performed using the same container handling vehicle used to subsequently transport the target storage container to the unloading port column 119, or using one or more other cooperating container handling vehicles. Alternatively, or in addition, the automated warehouse system 1 may have a container handling vehicle dedicated to the task of temporarily removing storage containers from the storage columns 105. Once the target storage container 106 is removed from the storage column 105, the temporarily removed storage container can be repositioned in the original storage column 105. However, the removed storage container may alternatively be relocated to another storage column.

[0024] When a storage container 106 is to be stored in one of the columns 105, one of the container handling vehicles 201, 301 is commanded to load the storage container 106 from the load port column 120 and transport it to a location above the storage column 105 where it is to be stored. After any storage container located at or above the target location in the storage column stack 107 is removed, the container handling vehicle 201, 301 positions the storage container 106 in the desired location. The removed storage container may then be lowered back into the storage column 105 or relocated to another storage column.

[0025] To monitor and control the automated warehouse system 1, for example, to monitor and control the locations of the individual storage containers 106 within the skeletal structure 100, the contents of each storage container 106, and the movements of the container handling vehicles 201, 301 so that the desired storage containers 106 can be delivered to the desired locations at the desired times without the container handling vehicles 201, 301 colliding with each other, the automated warehouse system 1 typically includes a control system 500 that is computerized and typically includes a database for tracking the storage containers 106.

[0026] A drawback of the prior art container handling vehicle 301 shown in FIGS. 3 and 4 is that horizontal movement of the lift frame 3 is not prevented until the lift frame 3 is fully raised and contacts the underside of the cantilevered section 6 from which the lift frame 3 depends. Once fully raised, a combined guide pin / contact sensor 26 provided on the upper side of the lift frame 3 interacts with the cantilevered section 6 and prevents horizontal movement between the lift frame 3 and the cantilevered section 6. To avoid potential errors caused by moving the lift frame 3 horizontally, the container handling vehicle 301 of FIGS. 3 and 4 should not move on the rail system 108 until the lift frame is fully raised. The time delay required for the container handling vehicle 301 to remain stationary until the lift frame is fully raised is minor. However, a storage system will typically have multiple container handling vehicles, each performing many lifting and lowering operations. As a result, slight time delays per operation will add up and contribute to less-than-optimal efficiency of the storage system.

[0027] It is an object of the present invention to provide an improved container handling vehicle, which avoids or mitigates some of the disadvantages of prior art vehicles featuring cantilevered sections. Summary of the Invention [Means for solving the problem]

[0028] The invention is defined below by the appended claims. In a first aspect, the present invention provides a container handling vehicle for lifting a storage container from an underlying framework, the vehicle comprising: The vehicle includes a container lifting assembly for lifting the storage container and a vehicle body;

[0029] the container lifting assembly comprises a lifting frame for releasable connection to the storage container, a lifting shaft assembly, and a plurality of lifting bands, the lifting bands being connected to the lifting frame and the lifting shaft assembly such that the lifting frame can be raised or lowered by operating the lifting shaft assembly; the vehicle body includes a sidewall and a cantilevered section from which the lifting frame depends, the cantilevered section extending laterally from an upper end of the sidewall;

[0030] The container lifting assembly features a lifting frame guide assembly including a first guide device and a cooperating second guide device;

[0031] The first guide device is provided on the lifting frame,

[0032] the second guide device is slidably connected to the side wall via at least one vertically extending rail such that the second guide device may move vertically relative to the side wall;

[0033] the first guide device and the second guide device are arranged to interact with each other when the lifting frame is adjacent the side wall so as to limit horizontal movement of the lifting frame relative to the vehicle body; Provide container handling vehicles.

[0034] In certain embodiments of the container handling vehicle, the first guide device and the second guide device may be arranged to interact with each other when the lifting frame is adjacent to the side wall so as to limit or prevent horizontal movement of the lifting frame relative to the vehicle body.

[0035] The lifting band may provide lifting band ends that are connected to the four corner sections of the lifting frame. In some embodiments, the container handling vehicle may include four lifting bands.

[0036] In other words, the lift band may be connected to the lift frame and the lift shaft assembly such that the lift frame may be raised or lowered relative to the cantilevered section by operating the lift shaft assembly.

[0037] In other words, the lift frame is suspended or hangs from the underside of the cantilevered section.

[0038] In certain embodiments of the container handling vehicle, the first guide device may extend upwards from the lifting frame, for example as a pin, or on the upper side of the lifting frame, for example into a hole.

[0039] In some embodiments of the container handling vehicle, the first guide device may be provided on the upper side of the lifting frame, for example as a pin extending upward from the upper side of the lifting frame or into an upper side of the lifting frame, for example in a hole.

[0040] In some embodiments of the container handling vehicle, the first guide device may be connected to the lift frame such that horizontal movement of the first guide device relative to the lift frame is prevented, in other words, the first guide device may be fixed or rigidly connected to the lift frame.

[0041] In other words, the first guide device and the second guide device may be arranged to interact and limit or prevent horizontal movement therebetween when the lifting frame is adjacent the side wall so that horizontal movement of the lifting frame relative to the vehicle body is limited or prevented.

[0042] In other words, the first guide device and the second guide device may be arranged to interact with each other when the lifting frame is moving vertically adjacent the side wall so as to limit or prevent horizontal movement of the lifting frame relative to the vehicle body.

[0043] In certain embodiments of the container handling vehicle, the first guide device and the second guide device may be arranged to interact such that horizontal movement therebetween is limited or prevented.

[0044] In certain embodiments of the container handling vehicle, the second guide device may be slidably connected to the side wall such that horizontal movement of the second guide element relative to the side wall is limited or prevented.

[0045] In one embodiment of the container handling vehicle, the vertically extending rail may extend from a lower position on the side wall towards the cantilevered section so that the second guide device may move vertically between a lower position adjacent the side wall and an upper position adjacent the side wall in which the lifting frame contacts the cantilevered section at the upper position.

[0046] In certain embodiments of the container handling vehicle, the at least one vertically extending rail may be at least one vertical rail.

[0047] In some embodiments of the container handling vehicle, the first guide device may include at least one first guide element and the second guide device may include at least one second guide element, the first guide element and the second guide element having complementary shapes such that horizontal movement between the first guide element and the second guide element is limited when the first guide element interacts with the second guide element. The complementary shapes of the first guide element and the second guide element may have respective opposite-facing surfaces that limit or prevent horizontal movement of the complementary shapes relative to each other when the complementary shapes interact.

[0048] In some embodiments of the container handling vehicle, a portion of the second guide device may be arranged at a position between the cantilever section and the lifting frame, and this portion may include at least one second guide element.

[0049] In some embodiments of the container handling vehicle, the second guide device may be a carriage. The carriage may include a first portion slidably connected to the sidewall by at least one rail and a second portion arranged at a position between the cantilevered section and the lifting frame. The second portion may include at least one second guide element.

[0050] In certain embodiments of the container handling vehicle, one of the first guide device and the second guide device may include at least one guide element that is a pin, protrusion, recess, or hole, and the other of the first guide device and the second guide device may include a complementary guide element for interacting with the at least one pin, protrusion, recess, or hole such that horizontal movement of the first guide device relative to the second guide device is limited or prevented.

[0051] In some embodiments of the container handling vehicle, the first guide device may include two horizontally spaced first guide elements, and the second guide device may include two second guide elements, each arranged to interact with a corresponding second guide element. The spacing of the guide devices may help to react to torque on the lift frame during vehicle movement, such as during acceleration or deceleration. In other embodiments, the number of first and second guide elements may be different. For example, there may be two first guide elements in the form of guide pins and one second guide element in the form of a slot.

[0052] In certain embodiments of the container handling vehicle, the first guide element may be a pin, a vertical recess, or a hole, and the second guide element may be a hole, a horizontal protrusion, or a pin, respectively.

[0053] In certain embodiments of the container handling vehicle, at least one of the first guide element and the second guide element may include an inclined surface for guiding the first and second guide devices into interaction.

[0054] In certain embodiments of the container handling vehicle, one of the first guide device and the second guide device may include at least one pin or vertical recess, and one of the first guide device and the second guide device includes a cooperating hole or protrusion, respectively, such that horizontal movement of the first guide device relative to the second guide device is limited or prevented.

[0055] In some embodiments of the container handling vehicle, one of the first and second guide devices may include a spring or other compliant device arranged to damp interaction between the first and second guide devices in the vertical direction.

[0056] a first set of wheels arranged on each side of the car body for moving the car along a first direction on a rail system of an underlying framework;

[0057] a second set of wheels arranged on the other sides of the vehicle body for moving the vehicle on the rail system along a second direction perpendicular to the first direction;

[0058] a first set of wheels vertically displaceable between a first position, in which the first set of wheels allows movement of the vehicle along a first direction, and a second position, in which the second set of wheels allows movement of the vehicle along a second direction; may also be provided.

[0059] In a second aspect, the present invention provides a storage system comprising a skeleton structure according to the first aspect of the invention and at least one container handling vehicle, the skeleton structure comprising a plurality of storage columns in which storage containers may be stored one above the other in vertical stacks, the container handling vehicle operating on a rail system at a top level of the skeleton structure for retrieving storage containers from the storage columns, storing the storage containers therein, and transporting the storage containers horizontally across the rail system. The rail system may be a rail grid system allowing movement of the container handling vehicle in two perpendicular directions. In a third aspect, the present invention provides a method of operating a container handling vehicle within a storage system, comprising: The storage system includes a skeletal structure and at least one container handling vehicle, the skeletal structure including a plurality of storage columns in which the storage containers may be stored one above the other in a vertical stack, the container handling vehicle operating on a rail system at a top level of the skeletal structure to retrieve the storage containers from the storage columns, store the storage containers therein, and transport the storage containers horizontally across the rail system; The container handling vehicle includes a container lifting assembly for lifting a storage container and a vehicle body;

[0060] the container lifting assembly comprises a lifting frame for releasable connection to the storage container, a lifting shaft assembly, and a plurality of lifting bands, the lifting bands being connected to the lifting frame and the lifting shaft assembly such that the lifting frame can be raised or lowered by operating the lifting shaft assembly; the vehicle body includes a sidewall and a cantilever section from which the lift frame is suspended, the cantilever section extending laterally from an upper end of the sidewall;

[0061] The container lifting assembly features a lifting frame guide assembly including a first guide device and a cooperating second guide device;

[0062] The first guide device is provided on the lifting frame,

[0063] the second guide device is slidably connected to the side wall via at least one vertically extending rail such that the second guide device may move vertically relative to the side wall;

[0064] the first guide device and the second guide device are arranged to interact with each other when the lifting frame is adjacent the side wall so as to limit or prevent horizontal movement of the lifting frame relative to the vehicle body;

[0065] - lowering the storage container into the storage column by use of a container lifting assembly;

[0066] - releasing the storage container from the lifting frame;

[0067] - lifting the lifting frame until the first guide device interacts with the second guide device;

[0068] - when the lowest level of the lifting frame is above the highest level of the rail system and before the lifting frame reaches its upper position, moving the container handling vehicle horizontally across the rail system; The present invention provides a method comprising:

[0069] In a fourth aspect, the present invention provides a method for preventing horizontal movement of a lift frame of a container handling vehicle, the container handling vehicle comprising: a container lift assembly for lifting a storage container; and a vehicle body;

[0070] the container lifting assembly comprises a lifting frame for releasable connection to the storage container, a lifting shaft assembly, and a plurality of lifting bands, the lifting bands being connected to the lifting frame and the lifting shaft assembly such that the lifting frame can be raised or lowered by operating the lifting shaft assembly;

[0071] the vehicle body includes a sidewall and a cantilever section from which the lift frame is suspended, the cantilever section extending laterally from an upper end of the sidewall;

[0072] The container lifting assembly features a lifting frame guide assembly including a first guide device and a cooperating second guide device;

[0073] The first guide device is provided on the lifting frame,

[0074] the second guide device is slidably connected to the side wall via at least one vertically extending rail such that the second guide device may move vertically relative to the side wall;

[0075] - lifting the lifting frame from a level below the container handling vehicle to a first position in which an interaction between the first guide device and the second guide device is initiated;

[0076] - lifting the lifting frame from a first position to a second position in which the first guide device and the second guide device interact with each other to limit or prevent horizontal movement of the lifting frame relative to the vehicle body; The present invention provides a method comprising: In one embodiment, the method according to the fourth aspect comprises:

[0077] - Lifting the lifting frame from the second position to a third position while the second guide device is simultaneously moved above the vertically extending rail by the lifting frame and the first guide device simultaneously interacts with the second guide device to limit horizontal movement of the lifting frame relative to the vehicle body.

[0078] In the second and third positions, and in positions between the second and third positions, the lifting frame may be at a level that allows horizontal movement of the container handling vehicle. In the third position, the lifting frame may contact or dock with the cantilevered section.

[0079] In the third and fourth aspects of the present invention, the container handling vehicle may be according to any of the embodiments of the first aspect.

[0080] The term "side wall" is intended to mean a side section of a vehicle body. The side section may include a cover plate, but may also be a skeletal structure. The side section may be substantially vertical.

[0081] The term "horizontal movement" is intended to include both lateral and rotational horizontal movement. The present specification also provides, for example, the following: (Item 1) A container handling vehicle (10) for lifting a storage container (106) from an underlying framework (100), comprising: The vehicle includes a container lifting assembly (3, 5, 7a, 7b) for lifting the storage container, and a vehicle body (8); the container lifting assembly comprises a lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilever section (6) from which a lifting frame (3) depends, the cantilever section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), the second guide device (13) is slidably connected to the side wall (9) via at least one vertically extending rail (19) such that the second guide device can move vertically relative to the side wall (9); the first guide device (12) and the second guide device (13) are arranged to interact with each other when the lifting frame is adjacent to the side wall (9) so as to limit horizontal movement of the lifting frame relative to the vehicle body; Container handling vehicle (10). (Item 2) Item 1. The vehicle according to item 1, wherein the second guide device (12) is slidably connected to the side wall (9) such that horizontal movement of the second guide element (12) relative to the side wall (9) is prevented. (Item 3) 3. The vehicle according to claim 1 or 2, wherein the vertical rail (19) extends from a lower position on the side wall (9) towards the cantilevered section (6) so that the second guide device (12) can move vertically between a lower position adjacent to the side wall (9) and an upper position where the lifting frame docks with the cantilevered section (6). (Item 4) 2. A vehicle according to any of the preceding items, wherein a section (22b) of the second guide device (13) is arranged between the cantilevered section (6) and the lifting frame (3). (Item 5) 10. The vehicle of claim 9, wherein the first guide device comprises at least one first guide element (15, 17, 24) and the second guide device comprises at least one second guide element (16, 18, 25), the first guide element and the second guide element having complementary shapes such that horizontal movement between the first guide element and the second guide element is limited when the first guide element interacts with the second guide element. (Item 6) 10. The vehicle of claim 9, wherein one of the first guide device (12) and the second guide device (13) comprises at least one guide element that is a pin (15, 25), a protrusion (18), a recess (17), or a hole (16, 24), and the other of the first guide device and the second guide device comprises a complementary guide element for interacting with the at least one pin, protrusion, recess, or hole such that horizontal movement of the first guide device relative to the second guide device is limited. (Item 7) 2. A vehicle according to any of the preceding items, wherein the first guide device (12) comprises two first guide elements (15, 17, 24) spaced apart in the horizontal direction, and the second guide device comprises two second guide elements (16, 18, 25), each of the first guide elements being arranged to interact with a corresponding second guide element. (Item 8) 10. The vehicle of claim 9, wherein one of the first guide device and the second guide device comprises at least one pin (15) or vertical recess (17), and one of the first guide device and the second guide device comprises a cooperating hole (16) or protrusion (18), respectively, such that horizontal movement of the first guide device relative to the second guide device is limited. (Item 9) 10. The vehicle of claim 9, wherein one of the first and second guide devices comprises a spring arranged to damp the interaction between the first and second guide devices in a vertical direction. (Item 10) a first set of wheels (21 a) arranged on both sides of the car body (8) for moving the vehicle (10) along a first direction (X) on a rail system (108) of the underlying framework (100); a second set of wheels (21b) arranged on the other two sides of the car body (8) for moving the vehicle (10) on the rail system (108) along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X); Equipped with the first set of wheels are displaceable in a vertical direction (Z) between a first position in which the first set of wheels allows movement of the vehicle (10) along the first direction (X) and a second position in which the second set of wheels allows movement of the vehicle (10) along the second direction (Y); A vehicle according to any of the preceding items. (Item 11) 10. A storage system according to any of the preceding items, comprising a skeleton structure (100) and at least one container handling vehicle (10), the skeleton structure (100) comprising a plurality of storage columns (105) in which storage containers (106) can be stored one above the other in vertical stacks (107), the container handling vehicle operating on a rail system (108) at the top level of the skeleton structure to retrieve storage containers (106) from the storage columns, store the storage containers therein, and transport the storage containers horizontally across the rail system (108). (Item 12) 1. A method of operating a container handling vehicle within a storage system, comprising: The storage system comprises a framework (100) and at least one container handling vehicle (10), the framework (100) comprising a plurality of storage columns (105) in which storage containers (106) can be stored one above the other in vertical stacks (107), the container handling vehicle operating on a rail system (108) at a top level of the framework (100) for retrieving storage containers (106) from the storage columns, storing the storage containers therein, and transporting the storage containers horizontally across the rail system (108); The container handling vehicle includes a container lifting assembly (3, 5, 7a, 7b) for lifting the storage container, and a vehicle body (8); the container lifting assembly comprises a lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilever section (6) from which the lifting frame (3) is suspended, the cantilever section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), the second guide device (13) is slidably connected to the side wall (9) via at least one vertically extending rail (19) such that the second guide device can move vertically relative to the side wall (9); the first guide device (12) and the second guide device (13) are arranged to interact with each other when the lifting frame (3) is adjacent to the side wall so as to limit horizontal movement of the lifting frame (3) relative to the vehicle body (8); The method comprises: lowering a storage container (106) into a storage column (105) using the container lifting assembly; Releasing the storage container (106) from the lifting frame (3); Lifting the lifting frame (3) until the first guide device (12) interacts with the second guide device (13); when the lowest level of the lifting frame (3) exceeds the highest level of the rail system (108) and before the lifting frame (3) reaches its upper position, moving the container handling vehicle horizontally across the rail system (108); A method comprising: (Item 13) A method for preventing horizontal movement of a lifting frame (3) of a container handling vehicle (10), the container handling vehicle comprising a container lifting assembly (3, 5, 7a, 7b) for lifting a storage container, and a vehicle body (8); the container lifting assembly comprises the lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilever section (6) from which the lifting frame (3) is suspended, the cantilever section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), the second guide device (13) is slidably connected to the side wall (9) via at least one vertically extending rail (19) such that the second guide device can move vertically relative to the side wall (9); The method comprises: Lifting the lifting frame (3) from a level below the container handling vehicle (10) to a first position where interaction between the first guide device and the second guide device begins; lifting the lift frame from the first position to a second position where the first guide device and the second guide device interact with each other to limit horizontal movement of the lift frame relative to the vehicle body; A method comprising: (Item 14) Item 14. The method of item 13, comprising: lifting the lift frame from the second position to a third position while the second guide device is simultaneously moved above the vertically extending rail by the lift frame and the first guide device simultaneously interacts with the second guide device to limit horizontal movement of the lift frame relative to the car body. [Brief explanation of the drawings]

[0082] Embodiments of the present invention will be described in detail by referring to the following drawings.

[0083] [Figure 1] FIG. 1 is a perspective view of the skeleton structure of a prior art automated warehouse system.

[0084] [Figure 2] FIG. 2 is a perspective view of a prior art container handling vehicle having a centrally arranged cavity for carrying storage containers therein.

[0085] [Figure 3] FIG. 3 is a perspective view of a prior art container handling vehicle having a cantilevered section for carrying storage containers underneath.

[0086] [Figure 4] FIG. 4 is a side view of the container handling vehicle of FIG. 3, showing the lifting device.

[0087] [Figure 5] 5-8 are perspective side views of a first exemplary container handling vehicle in accordance with the present invention. [Figure 6] 5-8 are perspective side views of a first exemplary container handling vehicle in accordance with the present invention. [Figure 7] 5-8 are perspective side views of a first exemplary container handling vehicle in accordance with the present invention. [Figure 8] 5-8 are perspective side views of a first exemplary container handling vehicle in accordance with the present invention.

[0088] [Figure 9] 9-11 are perspective side views of a second exemplary container handling vehicle in accordance with the present invention. [Figure 10] 9-11 are perspective side views of a second exemplary container handling vehicle in accordance with the present invention. [Figure 11] 9-11 are perspective side views of a second exemplary container handling vehicle in accordance with the present invention.

[0089] [Figure 12] FIG. 12 is a perspective top view of the container handling vehicle of FIGS. 9-11.

[0090] [Figure 13] 13-16 are perspective side views of a third exemplary container handling vehicle in accordance with the present invention. [Figure 14] 13-16 are perspective side views of a third exemplary container handling vehicle in accordance with the present invention. [Figure 15] 13-16 are perspective side views of a third exemplary container handling vehicle in accordance with the present invention. [Figure 16] 13-16 are perspective side views of a third exemplary container handling vehicle in accordance with the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0091] Detailed Description of the Invention In the following, embodiments of the present invention will be discussed in more detail with reference to the accompanying drawings, which, however, are not intended to limit the present invention to the subject matter depicted therein.

[0092] The present invention is a remotely operated container handling vehicle for use within an automated storage system featuring at least one rail system, for example, rail system 108, as discussed with respect to the prior art storage system disclosed in FIG.

[0093] Different exemplary embodiments of a container handling vehicle 10-10" according to the present invention are shown in Figures 5-16. The vehicle 10-10" is for loading storage containers 106 within an automated storage system 1, for example, as shown in Figure 1, through the use of container lifting assemblies 3, 5, 7a, 7b. The container lifting assemblies feature a lifting frame 3 for releasable connection to the storage containers 106, lifting shaft assemblies 7a, 7b (see Figure 12), and four lifting bands 5. The lifting bands 5 are connected to the lifting frame 3 and the lifting shaft assemblies 7a, 7b such that the lifting frame 3 can be raised or lowered by operating the lifting shaft assemblies.

[0094] Container handling vehicle 10-10'' has a body 8 with sidewalls 9 and a cantilever section 6. A lift frame 3 is suspended from cantilever section 6, which extends laterally from an upper end 11 of sidewall 9. As in prior art vehicles, the lift frame features a combined guide pin / contact sensor 26 arranged on the upper side of lift frame 3 (see FIG. 5b). Guide pin / contact sensor 26 interacts with cantilever section 6 when the lift frame is fully raised, preventing horizontal movement between lift frame 3 and cantilever section 6.

[0095] To limit horizontal movement of the lifting frame 3 during movement of the container handling vehicles 10-10'', each container handling vehicle 10-10'' features a lifting frame guide assembly having a first guide device 12-12'' and a cooperating second guide device 13-13''. The first guide device 12-12'' features at least one first guide element 15, 17, 24, and the second guide device 13-13'' features at least one second guide element 16, 18, 25, the first and second guide elements having complementary shapes. The complementary shapes are designed to limit horizontal movement, i.e., both lateral and rotational horizontal movement, between the first and second guide elements when the guide elements interact with each other.

[0096] The second guide device 13-13'' of the lift frame guide assembly may be described, for example, as a carriage (e.g., comprised of plate sections 22a, 22b, see below) that is slidably connected to the side wall 9 via at least one rail 19, 19'. The carriage couples to the lift frame 3 via the first guide device 12-12'' and moves with the lift frame 3 as the lift frame 3 moves from a position below the midpoint to where the lift frame docks with the cantilever section.

[0097] The complementary shapes of the first guide elements 15, 17, 24 and the second guide elements 16, 18, 25 serve to anchor the first guide device 12-12″ and the second guide device 13-13″ together as the lifting frame 3 is lifted and emerges from a storage grid, for example, from a storage column 105 as shown in FIG. 1 . The complementary shapes may be any shape or form provided that the first and second guide devices are restrained from horizontal movement relative to each other when positioned together. When positioned within the storage column 105, the horizontal movement of the lifting frame 3 is limited by the inner perimeter of the storage column 105. As the lifting frame 3 emerges from the storage column 105, horizontal restraint of the lifting frame 3 is provided by the second guide device 13-13″, which locks horizontal movement through its connection with the first guide device 12-12″.

[0098] A first exemplary embodiment of a container handling vehicle 10 according to the present invention is shown in Figures 5-8.

[0099] The first guide device 12 of the first exemplary embodiment comprises two vertical pins 15 (i.e., first guide elements) arranged on the upper side 14 of the lifting frame 3. The two pins 15 are connected to the lifting frame 3 such that horizontal movement of the pins relative to the lifting frame 3 is prevented.

[0100] The second guide device 13 has two holes 16 (i.e., a second guide element), each sized to accommodate one of the vertical pins 15 of the first guide device 12. The second guide device 13 is slidably connected to the side wall 9 via two rails 19 and can move vertically relative to the side wall 9. A portion of the second guide device 13, featuring the two holes 16, extends laterally from the side wall 9 at a position between the cantilever section 6 and the lift frame 3. In this embodiment, the second guide device is composed of a first plate section 22a and a second plate section 22b. The first plate section 22a is connected to the rails 19, and the second plate section 22b, featuring the two holes 16, extends from the upper end of the first plate section 22a between the cantilever section 6 and the lift frame 3.

[0101] The pins 15 and holes 16 are arranged such that when the lift frame 3 is adjacent to the side wall 9 they interact with each other, i.e., each pin 15 is housed within a corresponding hole 16, so that horizontal movement of the lift frame 3 relative to the car body 8 is limited. By having two pins 15 and complementary holes 16, rotational horizontal movement, i.e., twisting, of the lift frame relative to the car body 8 is limited.

[0102] It should be noted that the circular perimeters (i.e., complementary shapes) of pin 15 and hole 16 require a dual solution to limit rotational movement of the lift frame relative to car body 8. However, in other embodiments of the present invention, having at least two first guide elements and at least two complementary second guide elements is not essential for limiting rotational movement. In other embodiments, rotational movement can be limited, for example, by designing the first guide element as a pin / protrusion with a square or rectangular perimeter shape and the second guide element as a cooperating hole with a complementary square or rectangular perimeter shape. In general, it may be sufficient to provide the first and second guide elements with complementary non-circular perimeter shapes to limit rotational horizontal movement between the lift frame and car body while having a single first guide element and a single second guide element.

[0103] To avoid excessive noise and wear and potentially reduce any risk of the first and second guide devices becoming jammed, springs 20 or other flexible devices are arranged around each of the pins 15 to dampen the interaction between the first and second guide devices 12, 13 and the lifting frame 3.

[0104] By slidably connecting the second guide device 13 to the side wall 9 of the car body 8, the lifting frame 3 can be raised from a lower position close to the rail system 108, where it emerges from the lateral restraints of the grid, to a higher position adjacent to the side wall 9, while horizontal movement of the lifting frame 3 is limited or prevented. When in the lower position, the lowermost level of the lifting frame 3 is above the uppermost level of the rail system 108, where the container handling vehicles are arranged (see Figure 7). In the upper position, the lifting frame is fully raised towards the cantilevered section 6.

[0105] Thus, due to the lifting frame guide assemblies 12, 13, a container handling vehicle according to the present invention can begin moving on the rail system 108 as soon as the lifting frame reaches the lower position, for example, after storing a storage container 106 in a storage column 105. In most cases, when the lifting frame is not connected to a storage container 106, the lifting frame is kept in the lower position while the container handling vehicle moves on the rail system 108. In this way, time and energy are also saved by not requiring the lifting frame to be elevated between the cantilever section and the lower position when a storage container is to be retrieved. The lifting frame guide assemblies 12, 13 will also ensure that the container handling vehicle 10 can move on the rail system 108 as soon as a storage container connected to the lifting frame 3 has been elevated above the rail system 108 (see FIG. 8 ). The latter feature is advantageous when the container handling vehicle is used in a storage system with storage containers of different heights, since storage containers lower than the maximum storage container height can be raised and clear of the rail system before reaching their upper position where the lifting frame contacts the cantilever beam section.

[0106] 3 and 4, the container handling vehicle 10 of the present invention is more efficient in that a shorter time is required to perform multiple container lifting / storage operations. The prior art container vehicle 301 is not allowed to move on the rail system 108 until its lifting frame 3 is fully raised into contact with the cantilevered section.

[0107] To enable movement of the container handling vehicle 10 on the rail system 108, the vehicle 10 features a first set of wheels 21a arranged to enable movement of the vehicle along rails extending in a first direction of the rail system 108, e.g., a first direction X, as shown in FIG. 1, and a second set of wheels 21b arranged to enable movement of the vehicle along rails extending in a second direction, e.g., a second direction Y.

[0108] A second exemplary embodiment of a container handling vehicle 10' according to the present invention is shown in Figures 9-12.

[0109] The container handling vehicle 10' is the same as the first exemplary container handling vehicle 10 of Figures 5-8, except for the design of the first guide device 12' and the cooperating second guide device 13'.

[0110] The first guide device 12′ includes two vertical recesses 17 (i.e., first guide elements) arranged on the upper side 14 of the lift frame 3. The second guide device 13′ includes two protrusions 18 (i.e., second guide elements) sized to fit within one of the vertical recesses 17 of the first guide device 12′. The second guide device 13′ is slidably connected to the side wall 9 via two rails 19 and can move vertically relative to the side wall 9. A portion of the second guide device 13′, featuring the two protrusions 18, extends laterally from the side wall 9 and is positioned between the cantilevered section 6 and the lift frame 3. A spring 20′ or other flexible device is arranged in each of the recesses 17 to damp the interaction between the first and second guide devices 12′, 13′ and the lift frame 3.

[0111] A third exemplary embodiment of a container handling vehicle 10'' according to the present invention is shown in Figures 13-16.

[0112] The container handling vehicle 10'' is the same as the first and second exemplary container handling vehicles 10, 10' of Figures 5-12 except for the design of the first guide device 12'' and the cooperating second guide device 13''. The first guide device 12'' includes two vertical sleeves 23 positioned within the lift frame 3 that provide two holes 24 (i.e., first guide elements) in the upper side 14 of the lift frame 3. The second guide device 13'' includes two pins 25 (i.e., second guide elements), each sized to be received within one of the complementary holes 24 of the first guide device 12''. The second guide device 13'' is slidably connected to the side wall 9 via rails 19 and is able to move vertically relative to the side wall 9 while being restricted from horizontal movement relative to the side wall 9. A portion of the second guide device 13'', featuring two pins 25, extends laterally from the side wall 9 and is positioned between the cantilevered section 6 and the lifting frame 3. A spring (not shown) may be arranged around each of the pins 25, or alternatively within each of the sleeves 23, to damp the interaction between the first and second guide devices 12'', 13'' and the lifting frame 3.

[0113] The present invention is described with three specific combinations of guide elements, namely pins / holes and protrusions / recesses, for limiting horizontal movement of the lift frame. However, multiple alternative combinations of guide elements having complementary shapes that provide horizontal movement limits can be readily envisioned based on this disclosure.

Claims

1. A container handling vehicle (10) for lifting a storage container (106) from an underlying framework (100), comprising: The vehicle comprises a container lifting assembly (3, 5, 7a, 7b) for lifting the storage container, and a vehicle body (8); the container lifting assembly comprises a lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilevered section (6) from which a lifting frame (3) depends, the cantilevered section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), the first guide device (12) and the second guide device (13) are arranged to interact with each other when the lifting frame is adjacent to the side wall (9) so as to limit horizontal movement of the lifting frame relative to the vehicle body; Container handling vehicle (10).

2. 2. The vehicle of claim 1, wherein the second guide device (13) is slidably connected to the side wall (9) such that horizontal movement of the second guide device (13) relative to the side wall (9) is prevented.

3. 3. A vehicle according to claim 1 or 2, wherein the vertical rail (19) extends from a lower position on the side wall (9) towards the cantilevered section (6) so that the second guide device (13) can move vertically between a lower position adjacent to the side wall (9) and an upper position in which the lifting frame docks with the cantilevered section (6).

4. 4. A vehicle according to claim 3, wherein a section (22b) of the second guide device (13) is arranged between the cantilevered section (6) and the lifting frame (3).

5. 2. The vehicle of claim 1, wherein the first guide device (12) comprises at least one first guide element (15, 17, 24) and the second guide device (13) comprises at least one second guide element (16, 18, 25), the first guide element and the second guide element having complementary shapes such that horizontal movement between the first guide element and the second guide element is limited when the first guide element interacts with the second guide element.

6. 2. The vehicle of claim 1, wherein one of the first guide device (12) and the second guide device (13) comprises at least one guide element that is a pin (15, 25), a protrusion (18), a recess (17), or a hole (16, 24), and the other of the first guide device (12) and the second guide device (13) comprises a complementary guide element for interacting with the at least one pin, protrusion, recess, or hole such that horizontal movement of the first guide device (12) relative to the second guide device (13) is limited.

7. 2. The vehicle of claim 1, wherein the first guide device (12) comprises two first guide elements (15, 17, 24) spaced apart in the horizontal direction, and the second guide device (13) comprises two second guide elements (16, 18, 25), each of the first guide elements being arranged to interact with a corresponding second guide element.

8. 2. The vehicle of claim 1, wherein one of the first guide device (12) and the second guide device (13) comprises at least one pin (15) or vertical recess (17), and one of the first guide device (12) and the second guide device (13) comprises a cooperating hole (16) or protrusion (18), respectively, such that horizontal movement of the first guide device (12) relative to the second guide device (13) is limited.

9. 2. The vehicle of claim 1, wherein one of the first and second guide devices comprises a spring arranged to damp the interaction between the first and second guide devices in a vertical direction.

10. a first set of wheels (21 a) arranged on each side of the car body (8) for moving the vehicle (10) along a first direction (X) on a rail system (108) of the underlying framework (100); a second set of wheels (21b) arranged on the other two sides of the car body (8) for moving the vehicle (10) on the rail system (108) along a second direction (Y), the second direction (Y) being perpendicular to the first direction (X); Equipped with The first set of wheels are displaceable in a vertical direction (Z) between a first position in which the first set of wheels allows movement of the vehicle (10) along the first direction (X) and a second position in which the second set of wheels allows movement of the vehicle (10) along the second direction (Y). The vehicle of claim 1 .

11. 10. A storage system comprising a skeletal structure (100) and at least one container handling vehicle (10) according to claim 1, wherein the skeletal structure (100) comprises a plurality of storage columns (105) in which storage containers (106) can be stored one above the other in vertical stacks (107), and the container handling vehicle operates on a rail system (108) at a top level of the skeletal structure to retrieve storage containers (106) from the storage columns, store the storage containers therein, and transport the storage containers horizontally across the rail system (108).

12. 1. A method of operating a container handling vehicle within a storage system, comprising: The storage system comprises a skeleton structure (100) and at least one container handling vehicle (10), the skeleton structure (100) comprising a plurality of storage columns (105) in which storage containers (106) can be stored one above the other in vertical stacks (107), the container handling vehicle operating on the rail system (108) at a top level of the skeleton structure to retrieve storage containers (106) from the storage columns, store the storage containers therein, and transport the storage containers horizontally across the rail system (108); The container handling vehicle includes a container lifting assembly (3, 5, 7a, 7b) for lifting the storage container, and a vehicle body (8); the container lifting assembly comprises a lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilever section (6) from which the lifting frame (3) is suspended, the cantilever section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), the first guide device (12) and the second guide device (13) are arranged to interact with each other when the lifting frame (3) is adjacent to the side wall so as to limit horizontal movement of the lifting frame (3) relative to the car body (8); The method comprises: lowering a storage container (106) into a storage column (105) using said container lifting assembly; Releasing the storage container (106) from the lifting frame (3); Lifting the lifting frame (3) until the first guide device (12) interacts with the second guide device (13); when the lowest level of the lifting frame (3) exceeds the highest level of the rail system (108) and before the lifting frame (3) reaches its upper position, moving the container handling vehicle horizontally across the rail system (108); A method comprising:

13. A method for preventing horizontal movement of a lifting frame (3) of a container handling vehicle (10), the container handling vehicle comprising a container lifting assembly (3, 5, 7a, 7b) for lifting a storage container, and a vehicle body (8); the container lifting assembly comprises the lifting frame (3) for releasable connection to a storage container (106), a lifting shaft assembly (7a, 7b), and a plurality of lifting bands (5), the lifting bands (5) being connected to the lifting frame (3) and the lifting shaft assembly (7a, 7b) such that the lifting frame (3) can be raised or lowered by operating the lifting shaft assembly; the body (8) comprises a side wall (9) and a cantilever section (6) from which the lifting frame (3) is suspended, the cantilever section (6) extending laterally from an upper end (11) of the side wall (9); The container lifting assembly is characterized by a lifting frame guide assembly comprising a first guide device (12) and a cooperating second guide device (13), The first guide device (12) is provided on the lifting frame (3), The method comprises: Lifting the lifting frame (3) from a level below the container handling vehicle (10) to a first position where interaction between the first guide device (12) and the second guide device (13) begins; Lifting the lifting frame from the first position to a second position in which the first guide device (12) and the second guide device (13) interact with each other to limit horizontal movement of the lifting frame relative to the vehicle body; A method comprising:

14. The method comprising:

14. The method of claim 13, further comprising the step of lifting the lift frame from the second position to a third position while the second guide device (13) is simultaneously moved above the vertically extending rail by the lift frame and the first guide device (12) simultaneously interacts with the second guide device (13) to limit horizontal movement of the lift frame relative to the car body.

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