WO2017023179A1 - Accessoire pour un appareil de levage - Google Patents

Accessoire pour un appareil de levage Download PDF

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Publication number
WO2017023179A1
WO2017023179A1 PCT/NZ2016/050123 NZ2016050123W WO2017023179A1 WO 2017023179 A1 WO2017023179 A1 WO 2017023179A1 NZ 2016050123 W NZ2016050123 W NZ 2016050123W WO 2017023179 A1 WO2017023179 A1 WO 2017023179A1
Authority
WO
WIPO (PCT)
Prior art keywords
load
lifting
arm
lifting surface
interface component
Prior art date
Application number
PCT/NZ2016/050123
Other languages
English (en)
Inventor
Steven Theo HAYTHORNE
Original Assignee
Mobotech Limited
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 Mobotech Limited filed Critical Mobotech Limited
Publication of WO2017023179A1 publication Critical patent/WO2017023179A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/18—Load gripping or retaining means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/19—Additional means for facilitating unloading
    • B66F9/195—Additional means for facilitating unloading for pushing the load

Definitions

  • the invention relates to industrial machines used to lift and transport materials short distances and in particular improving the ability of such machines to lift and transport bread and milk pallets.
  • a standardised crate or pallet is used for the mass storage and transportation of stock material.
  • the pallet has a rectangular base supported by sidewalls. Two opposing sidewalls on the shorter sides of the rectangle extend below the base to the ground.
  • Industrial machines such as forklifts are typically used to pick up and transport the pallets.
  • a pallet entry space for forklift forks to be inserted and positioned is defined beneath the base on the longer side of the rectangle.
  • pallets and other loads to be lifted are breaking away from
  • the invention consists in a device adapted for use with a load lifting apparatus having a chassis and a lifting surface extending that extends from the chassis and is operable to vertically support and lift a load, the device operable to engage and tip a load to be lifted to allow a leading edge of the lifting surface to pass beneath the load, the device comprising : at least one arm extending from a pivotal attachment to the chassis or lifting surface, the arm supporting a wheel and load interface component at a location distal from the pivotal attachment, wherein the load interface component is adapted to engage with the side surface of the load to be lifted, wherein pivotal attachment is adapted for retractable mounting relative to the lifting surface such that the distal end of the at least one arm is moveable between a distal extended position, and a retracted position relative to the lifting surface, wherein, in the extended position, the wheel and load interface component are displaced forward of the lifting surface such that the at least one wheel is ground contacting forward of the lifting surface, and in the retracted position, the
  • the at least one arm comprises two or more telescopic sections adapt to collapse under axial load created when the lifting apparatus drives the load interface component into a load to be lifted.
  • the device further comprises a platform adapted to mount to the lifting apparatus and support the pivotal attachment, the platform moveable between a first location proximate the lifting surface to a second location distal from the lifting surface.
  • the platform comprises one or more rails upon which the pivotal attachment is supported, the rails adapted to provide a support surface to guide the pivota l attachment between the extended and retracted positions.
  • the device further comprises at least one biasing element or spring adapted to bias the at least one arm toward the extended position.
  • the biasing element is located concentric to at least one arm and adapted to store compressive energy as the at least one arm transitions from the extended position to the retracted position.
  • the at least one support wheel is supported beneath the distal end of the at least one arm such that the at least one support wheel is ground contacting when the arm is extended.
  • the at least one support wheel is arranged to be lifted by the lifting surface as the at least one arm transitions from the extended position to the retracted position so as to impart a vertical force on the at least one support wheel and load interface component.
  • the load interface component is supported by an extension that extends from a second pivotal connection with the distal end of the at least one arm, wherein the range of motion of the second pivotal connection is limited such that the load interface component extends forward of the lifting surface and has a range of motion between horizontal and vertical.
  • the invention consists in a load lifting apparatus having a chassis and a lifting surface extending that extends from the chassis and is operable to vertically support and lift a load, the apparatus comprising a device operable to engage and tip a load to be lifted to allow a leading edge of the lifting surface to pass beneath the load, the device comprising : at least one arm extending from a pivotal attachment to the chassis or lifting surface, the arm supporting a wheel and load interface component at a location distal from the pivotal attachment, wherein the load interface component is adapted to engage with the side surface of the load to be lifted, wherein pivotal attachment is adapted for retractable mounting relative to the lifting surface such that the distal end of the at least one arm is moveable between a distal extended position, and a retracted position relative to the lifting surface, wherein, in the extended position, the wheel and load interface component are displaced forward of the lifting surface such that the at least one wheel is ground contacting forward of the lifting surface, and in the retracted position, the lifting surface is beneath the at least one
  • the at least one arm comprises two or more telescopic sections adapt to collapse under axial load created when the lifting apparatus drives the load interface component into a load to be lifted.
  • the device further comprises a platform adapted to mount to the lifting apparatus and support the pivotal attachment, the platform moveable between a first location proximate the lifting surface to a second location distal from the lifting surface.
  • the platform comprises one or more rails upon which the pivotal attachment is supported, the rails adapted to provide a support surface to guide the pivotal attachment between the extended and retracted positions.
  • the device further comprises at least one biasing element or spring adapted to bias the at least one arm toward the extended position.
  • the biasing element is located concentric to at least one arm and adapted to store compressive energy as the at least one arm transitions from the extended position to the retracted position.
  • the at least one support wheel is supported beneath the distal end of the at least one arm such that the at least one support wheel is ground contacting when the arm is extended.
  • the at least one support wheel is arranged to be lifted by the lifting surface as the at least one arm transitions from the extended position to the retracted position so as to impart a vertical force on the at least one support wheel and load interface component.
  • the load interface component is supported by an extension that extends from a second pivotal connection with the distal end of the at least one arm, wherein the range of motion of the second pivotal connection is limited such that the load interface component extends forward of the lifting surface and has a range of motion between horizontal and vertical.
  • the invention consists in a method of operating the load lifting apparatus according to any of the other embodiments described in this specification, the method comprising : driving the apparatus toward to load to be lifted such that: the load interface component strikes and engages the load, the at least one arm transitions between the extended and retracted positions, the lifting surface is driven beneath the at least one support wheel, and the load is driven onto the lifting surface.
  • the invention broadly consists in a fork attached or for attachment to a forklift, the fork comprising : at least one tine attached to the fork, the tine comprising : a first end pivotably connected with the fork and located dista l from the leading edge of the fork, and a second end adapted for engagement with a load to be lifted by the fork, wherein the tine is pivotable between a first position and a second position, the first position comprising the tine substantially aligned with the axis of elongation of the fork, and the second position comprising tine inclined toward the leading edge of the fork.
  • the second end is located proud of the inclined edge of the fork.
  • the tine is biased into the inclined position by a biasing element.
  • the fork comprises a recess and the tine resides in the recess when in the first position.
  • the tine is inclined in the range of 95 to 135 degrees, with respect to the axis of elongation of the fork, when in the inclined.
  • the biasing element is a spring.
  • the engagement of the tine with a load to be lifting causes the tine to first pivot toward a vertical position thereby lifting the engaged load.
  • the fork further comprises a flange arranged to surround the tine when in the first position.
  • the flange comprises one or more openings configured to accept a fastener.
  • the tine and the flange each further comprise an aperture in axial alignment and a pin disposed to span from the tine to the flange.
  • the invention broadly consists in an attachment for a fork of a forklift comprising : a tine coupled to the fork at a connected end by a pivotable connection, the tine further comprising at least a first and a second position, wherein : the first position is substantially a capitad with the axis of elongation of the fork, and the second position comprises a non-connected end of the tine inclined toward the leading edge of the fork.
  • the invention broadly consists in a tine pivotablly attached or attachable to a fork of a fork lift proximate the leading edge thereof, the tine comprising a bias toward a position inclined toward the leading edge of a fork, and wherein the tine is pivotable against the bias to a flat position.
  • the invention broadly consists in a tine comprising an end having a hinged attachment to the leading edge of a fork of a forklift, wherein the tine is rotatable between : an inclined position wherein a non-hinged end is proud of the leading edge of the fork, and a flat position wherein the tine is substantially flat against the fork.
  • the invention broadly consists in a lifting a pparatus comprising :
  • first and second drive wheels aligned about and spaced along an axis of rotation
  • at least one motive device adapted to drive, either together or independently, the first and second drive wheels such that motion of the lifting apparatus is effected
  • a lifting mechanism comprising a mast and one or more lifting surfaces extending forward of the mast adapted to engage beneath a load to be lifted, wherein the mast comprises a plurality of pegs arranged to project toward the front of the one or more lifting surfaces to engage, in use, with a load positioned on the one or more lifting surfaces.
  • the invention broadly consists in a mechanism for stabilising a load on a lifting apparatus comprising one or more lifting surfaces surface adapted to engage beneath a load to be lifted, the lifting surfaces extending forward of a vertical extension, wherein the vertical extension comprises a plurality of pegs arranged to project toward the front of the apparatus to engage with a load positioned on the one or more lifting surfaces.
  • the invention broadly consists in a lifting mechanism comprising a mast and one or more lifting surfaces extending forward of the mast adapted to engage beneath a load to be lifted, wherein the mast comprises a plurality of pegs arranged to project toward the front of the one or more lifting surfaces to engage, in use, with a load positioned on the one or more lifting surfaces.
  • the invention broadly consists in a mast configured for use with a lifting surface of a lifting apparatus, wherein the mast comprises a plurality of pegs arranged to project toward the front of the one or more lifting surfaces to engage, in use, with a load positioned on the one or more lifting surfaces.
  • the pegs comprise at least one pair of pegs arranged on the mast. In some embodiments two or more pairs of pegs are spaced at vertical intervals along the mast. In some embodiments each pair of pegs extend substantially pa rallel to the one or more lifting surfaces. In some embodiments the pair of pegs are arranged to taper outwardly from the lifting mast. In some embodiments the taper angle is in the range of 5 to 45 degrees. In some embodiments the taper angle is approximately 15 degrees.
  • the one or more lifting surfaces are adapted to engage and lift pallets in a two-wide configuration and each of the pegs in the pair of pegs is configured to engage with a recess in the side surface of the two-wide configured pallets on the one or more lifting surfaces to thereby prevent lateral movement of the pa llets.
  • the lifting apparatus further comprises one or more support wheels operatively coupled to the drive wheels, a sensor adapted to provide an output indicative of the load on the one or more support wheels, and a control system configured to receive the output from the sensor, and generate a signal for operating an actuation device to maintain the load on the one or more support wheels to substantially balance the lifting a pparatus about the drive wheels.
  • the invention broadly consists in a device for a lifting apparatus having a lifting surface, the device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising by imparting a tipping motion to an incident side the product to be lifted, wherein the device is pivotably connected to the lifting apparatus so as to pivot between : a first position opera ble to engage with a side surface of a product to be lifted, and a second position whereby the device is operable to disengage with the side surface of the product.
  • the device is adapted to impart, when pivoting between the first and second positions, at least an upward force on the product operable to lift the incident side of the product.
  • the invention broadly consists in a device for a lifting apparatus with a lifting surface, the device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : an arm extending from an end pivotally attached to the lifting apparatus to a distal end, the distal end supporting a wheel and a product interface component adapted to engage the side of a product to be lifted, wherein the distal end of the arm is moveable between at least a distal position, relative to the lifting apparatus where the wheel and engagement surface are displaced forward of the lifting surface, and a retracted position, and wherein the wheel and product engagement surface are arranged such that the wheel is ground contacting when the product interface component is engaged with the side of a product.
  • the wheel is arranged such that the lifting surface, when driven toward the product to be lifted, is driven beneath the wheel so as to impart a vertical force on the wheel and product interface component.
  • the extensile length of the arm is defined by the length between the rear of the lifting surface and the distal end of the arm. In some embodiments the length of the arm is adapted to shorten under load.
  • the arm is operable to collapse under load. In some embodiments the arm comprises telescopic sections operable to collapse under load.
  • the first end of the arm is pivotally attached to a platform moveable between a first location proximate the lifting surface to a second location distal from the lifting surface.
  • the device further comprises a spring arranged to bias the first end of the arm is biased toward the first location proximate the lifting surface.
  • the load applied to the arm is caused by the lifting apparatus being driven toward a load to be lifted and engagement with a product to be lifted.
  • the invention broadly consists in a lifting apparatus comprising a lifting surface and a device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : an arm extending from an end pivotally attached to the lifting apparatus to a distal end, the distal end supporting a wheel and a product interface component adapted to engage the side of a product to be lifted, wherein the distal end of the arm is moveable between at least a distal position, relative to the lifting apparatus where the wheel and engagement surface are displaced beyond the lifting surface, and a retracted position, and wherein the wheel and product engagement surface are arranged such that the wheel is ground contacting when the product interface component is engaged with the side of a product.
  • the lifting a pparatus further comprises one or more support wheels operatively coupled to the drive wheels, a sensor adapted to provide an output indicative of the load on the one or more support wheels, and a control system configured to receive the output from the sensor, and generate a signal for operating an actuation device to maintain the load on the one or more support wheels to substantially balance the lifting apparatus about the drive wheels.
  • the invention broadly consists in a device for a lifting apparatus with a lifting surface, the device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : a first arm extending from an end pivotally attached to the lifting apparatus to a distal end, the distal end of the first arm supporting : a wheel, and a second arm extending from a pivotal connection to the first arm toward a distal end operable to engage, directly or indirectly, with the product to be lifted, and wherein the distal end of the arm is moveable between at least a distal position, relative to the lifting apparatus where the wheel and engagement surface are displaced forward of the lifting surface, and a retracted position, and wherein the wheel and product engagement surface are arranged such that the wheel is ground contacting when the product interface component is engaged with the side of a product.
  • the invention broadly consists in a lifting a pparatus with a lifting surface comprising a device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : a first arm extending from an end pivotally attached to the lifting apparatus to a distal end, the distal end of the first arm supporting : a wheel, and a second arm extending from a pivotal connection to the first arm toward a distal end operable to engage, directly or indirectly, with the product to be lifted, and wherein the distal end of the arm is moveable between at least a distal position, relative to the lifting apparatus where the wheel and engagement surface are displaced forward of the lifting surface, and a retracted position, and wherein the wheel and product engagement surface are arranged such that the wheel is ground contacting when the product interface component is engaged with the side of a product.
  • the wheel is arranged such that the lifting surface, when driven toward the product to be lifted, is driven beneath the wheel so as to impart a vertical force on the wheel and product interface component.
  • the extensile length of the arm is defined by the length between the rear of the lifting surface and the distal end of the arm. In some embodiments the length of the arm is adapted to shorten under load.
  • the arm is operable to collapse under load. In some embodiments the arm comprises telescopic sections operable to collapse under load.
  • the first end of the arm is pivotally attached to a platform moveable between a first location proximate the lifting surface to a second location distal from the lifting surface.
  • the device further comprises a spring arranged to bias the first end of the arm is biased toward the first location proximate the lifting surface.
  • the load applied to the arm is caused by the lifting apparatus being driven toward a load to be lifted and engagement with a product to be lifted.
  • the invention broadly consists in a device for a lifting apparatus with a lifting surface, the device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : an arm extending from a pivotal connection to the lifting apparatus and toward a distal end operable to engage, directly or indirectly, with the product to be lifted.
  • a lifting apparatus with a lifting surface comprising a device operable to engage a product to be lifted to allow the lifting surface to pass beneath, the device comprising : an arm extending from a pivotal connection to the lifting apparatus and toward a distal end operable to engage, directly or indirectly, with the product to be lifted.
  • the arm is arranged to engage with the product to be lifted, when driven toward and into the product to be lifted, such that a tipping force is imparted on the product by the engaged side of the product being vertically displaced so as to allow the lifting surface to pass beneath.
  • the distal end of the arm comprises a product interface component adapted to engage the side of the product to be lifted.
  • the lifting apparatus further comprises: first and second drive wheels, one or more support wheels operatively coupled to the drive wheels, a sensor adapted to provide an output indicative of the load on the one or more support wheels, and a control system configured to receive the output from the sensor, and generate a signal for operating an actuation device to maintain the load on the one or more support wheels to substantially bala nce the lifting apparatus about the drive wheels.
  • the lifting mechanism includes a lilting surface and an actuator adapted to at least lower or level the lifting surface such that a load is engaged, or raise or upwardly tilt the lifting surface such that a load is retained on the lifting surface when the lifting apparatus is in motion.
  • the lifting mechanism includes a lilting surface and an actuator adapted to at least lower or level the lifting surface such that a load is engaged, or raise or upwardly tilt the lifting surface such that a load is retained on the lifting surface when the lifting apparatus is in motion.
  • the one or more support wheels includes one or more forward support wheels located longitudinally forward of the drive wheels, one or more aft support wheels located longitudinally aft of the drive wheels, and a first and a second actuation device adapted to raise and lower the one or more forward and aft support wheels.
  • the first actuation device and second actuation device are independently operable to cause movement of together or
  • This invention may also be said broadly to consist in the parts, elements and features referred to or indicated in the specification of the application, individually or collectively, and any or all combinations of any two or more of said parts, elements or features, and where specific integers are mentioned herein which have known equivalents in the art to which this invention relates, such known equivalents are deemed to be incorporated herein as if individually set forth.
  • specific integers are mentioned herein which have known equivalents in the art to which this invention relates, such known equivalents are deemed to be incorporated herein as if individually set forth.
  • Figure 1 shows an example of the pallet standard to the milk and bread industries.
  • Figure 2 shows an embodiment of the invention with a tine in an upright position.
  • Figure 3 shows an embodiment of the invention with a tine in the lowered position.
  • Figure 4 show a lifting apparatus approaching and picking up a pallet.
  • Figure 5 show a lifting surface and tines cleaving a pallet from a stack of pallets.
  • Figure 6 shows a perspective view of the embodiment of Figure 5.
  • Figure 7 shows perspective and profile views of an embodiment with an assembly
  • Figure 8 shows and example of pallet layouts on a truck bed.
  • Figure 9 shows side profile and shows a perspective view of a lifting apparatus
  • Figure 10 shows two stacks of palletised loads in a side-by-side configuration.
  • Figure 11 shows a perspective view of a preferred arrangement of the pegs.
  • Figure 12 shows a front view of the preferred arrangement of the pegs.
  • Figure 13 shows an example of the product interface component having a plate surface having protruding features with an upper surface adapted to engage with a product.
  • Figure 14 shows an example of a product that has sidewalls featuring a recess.
  • Figure 15 shows one embodiment of the device that operates by engaging with a
  • Figure 16 shows a close up detailed view of the embodiment shown in Figure 15.
  • Figure 17 shows a lifting apparatus approaching and engaging a stack of product to be lifted.
  • Figure 18 shows perspective views of components of one embodiment of the device.
  • Figure 19 shows perspective views of components of one embodiment of the device.
  • Figure 20 shows perspective views of components of one embodiment of the device.
  • Figure 21 shows a further embodiment that is a variation of the embodiment shown in Figures 15 to 17.
  • Figure 22 shows the lifting apparatus of Figure 21 lifting apparatus engaging a product.
  • Figure 23 shows a further embodiment that is a variation of the embodiment shown in
  • Figure 24 shows the lifting apparatus of Figure 23 lifting apparatus engaging a product.
  • Embodiments of the invention generally relate to a forklift (a lso called a lift truck, a fork truck, or a forklift) or any mobile apparatus normally used to lift and transport objects on a lifting surface.
  • the terms "fork” and “lifting surface” as used in this specification are intended to refer to a surface or surfaces of fork lift apparatus normally used to engage and lift pa llets or loads.
  • the lifting surface of a fork lift comprises a one or more surface sheets adapted to slide under a load to be lifted.
  • the lifting surface comprises two or more protruding members or forks. Forms of lifting surface best suited for use with milk and bread crates will be apparent to those skilled in the art.
  • One particular lifting apparatus for use with embodiments described herein is suitable for use in the lifting and transportation of loads, and particularly palletised loads such as milk or bread stacks.
  • Bread stacks typically conform to a base dimension of around 685 mm square.
  • the lifting apparatus should be operable to lift a load to a height of up to around 1.8 metres.
  • the lifting apparatus be able to lift a load of up to 170 kg.
  • the lifting apparatus is narrow enough to fit between rows of 685 mm bread stacks or stacks of other palletised loads in a warehousing environment.
  • the lifting apparatus is short enough to turn on itself in the back of a truck.
  • the lifting apparatus is most suitable for those that have a need for repetitive movement of a standardised load size and would benefit from having manoeuvrability in confined spaces.
  • the lifting a pparatus comprises a mechanism that is capable of engaging and lifting a load.
  • a preferred form of the lifting apparatus for use with embodiments of the invention described herein typically has a lifting mechanism, first and second drive wheels, one or more support wheels operatively coupled to the drive wheels, a sensor adapted to provide an output indicative of the load on the one or more support wheels, and a control system configured to receive the output from the sensor, and generate a signal for operating an actuation device to maintain the load on the one or more support wheels to substantially balance the lifting apparatus about the drive wheels.
  • the lifting a pparatus has first and second drive wheels aligned about and spaced along an axis of rotation.
  • a structure having a longitudinal dimension defined perpendicular to the axis of rotation of the drive wheels rotatably supports the first and second drive wheels.
  • the lifting apparatus also has a lifting mechanism longitudinally offset from the lifting apparatus.
  • Each of the drive wheels is independently rotatable which means the drive wheels can be rotated in the same direction, in opposite directions or one wheel can be rotated while the other wheel is stationary. By driving the wheels in opposite direction the lifting apparatus can be rotated about a pivot point located between the drive wheels.
  • each drive wheel is typically facilitated by an electric motor positioned within the base structure and coupled to each wheel, either directly or by a transfer device.
  • a single electric motor may be used and a gearbox or torque transfer device used to couple drive energy to each wheel independently of the other.
  • the electric motor could be replaced with an internal combustion engine.
  • the lifting a pparatus has primary drive axle, a front support axle and a rear support axle.
  • the front axle and primary drive axles are primarily used to support the apparatus when carrying a load.
  • the front axle may also be actuated to extend the wheelbase in response a load cell measurement to thereby improve the centre of balance and the loading capacity of the lifting apparatus.
  • the rear axle is used to support the apparatus when not carrying a load.
  • the rear axle is under suspension to keep the main drive axle of the apparatus engaged with the ground when negotiating inclines and declines.
  • FIG. 9(a) and 9(b) One example of a lifting apparatus with a lifting mast operable to raise and lower a lifting surface is shown in Figure 9(a) and 9(b).
  • the lifting surface is a surface that extends forward from the lifting mast and the chassis and is adapted to slide under a load to be lifted or otherwise engage with an aperture or other type of engagement on a load so that the load can be lifted.
  • the dimensions of the lifting surface may be approximately 600 mm wide x 400 mm deep x 260 mm height. However, wider lifting surfaces and split lifting surfaces may be desirable, for example, where the apparatus is adapted to lift two or more stacks of pallets.
  • the lifting a pparatus typically has a mast attached to the chassis and optionally an upsta nding support structure.
  • the lifting mast may have a plurality of hooks to engage with apertures typically found on a pallet or crate.
  • the hooks are adapted to secure a load of stacked bread crates to the lifting mast to prevent any inadvertent movement of the stack that may cause an accident.
  • the hooks may be actuated in a vertical orientation to engage and disengage with apertures in a bread stack and thereby secure the stack.
  • the chassis of the lifting apparatus comprises an upstanding support member and an arm support attached thereto.
  • the arm support provides a mount for one or more control input devices, such as a joystick, that an operator may be use control operation of the drive wheels and other functions that the lifting apparatus may be configured to provide.
  • Control input devices are operable to control the vertical movement of the lifting mast and the lifting surface.
  • the control input device facilitates additional control input to cause tilting or yaw or side shift of the lifting surface, or a combination thereof, to provide added versatility.
  • the two driving wheels share an axial alignment and are connected to the base platform or chassis of the lifting apparatus by way of an axle support structure.
  • the drive wheels may be attached to the platform by any appropriate means, such as by connecting the wheels each to a motor, wherein the motor is attached to the platform.
  • At the forward section of the platform is a lifting mast and a lifting surface.
  • a rearward support wheel is shown as located to an aft portion of the underside structure, relative to the longitudinal plane of the lifting apparatus.
  • the aft support wheel may comprise at least one wheel, and is preferably two or more wheels to provide lateral stability to the lifting apparatus under lateral loads.
  • Each aft support wheel is freely pivotable about the attachment to the platform structure.
  • the support wheel is a caster wheel or at least has a low friction surface.
  • Figure 1 shows an example of the pallet used in the bread and milk industries.
  • the pallet 1 has a rectangular base 10 surrounded by sidewalls 20.
  • the sidewalls 20 form a partially enclosed space in which bread or milk can be loaded.
  • Sidewa ll features 22, comprising ribs, handles and contours, are located on the outer walls of pallets in the milk and bread industries to provide structural strengthening, keys or grooves for stacking alignment and grip for manual lifting.
  • the sidewalls 21 extend at least partially below the base to define a space 30 where forklift forks are ordinarily inserted to enable the pallet to be lifted .
  • Arrow A indicates the conventional insertion direction of a lifting surface.
  • embodiments described herein facilitate a lifting surface to engage a pallet when approaching from the shorter of the pallet sides where the sidewalls extend below the pallet base where there is no insertion gap.
  • Arrow B indicates this nonconventional direction.
  • an approach from the nonconventional direction would cause the forklift forks to be driven into the sidewalls 21 of the pallet thereby causing damage to the sidewall of the pallet.
  • the use of a mechanism configured to engage with features 22 on the sidewall of a pallet enables the pallet to be lifted far enough such that the lifting surface can slide underneath.
  • Embodiments of the mechanism are configured to lift the incident edge 23 of the pallet above the ground so that a lifting surface can slide underneath the pallet.
  • the mechanism is adapted to engage with a smooth sidewall surface.
  • the mechanism comprises one or more piercing members, such as spikes, which may penetrate the sidewall to grip the sidewa ll to lift it.
  • piercing members such as spikes
  • engagement with the sidewall of the load to be lifted may be effected by an electro-adhesive surface.
  • Electro-adhesion when energised, creates a connection between a product interface and a product such that a vertical motion of path is able to be actuated onto a product.
  • FIGS. 2 and Figure 3 show an example of one embodiment of the mechanism comprising a pivotable tine.
  • the tine has a pointed projection 40 attached, or for attachment to, a lifting surface 50 by a hinged connection 60.
  • the hinged connection 60 facilitates pivoting of the tine 40 between a first position where the tine 40 is flat and aligned with the axis of extension of the lifting surface, and an upright inclined position.
  • the hinged connected 60 is located at a position proximate but spaced back from the leading edge 51 of the lifting surface 50.
  • Figures 2(a) and 2(b) show the tine 40 in the upright or inclined position.
  • the tine 40 is inclined from the hinged connection 60 toward the leading edge 51 of the lifting surface 50.
  • the upper and leading edge of the tine is at least inline, and preferably proud of the leading edge 51 of the lifting surface as indicated by line D.
  • the tine should rotate and extend past the vertica l axis as indicated by line C so as to create at least somewhat of an upward motion to any pallets it is engaged with.
  • the tine has an inclination angle in the range of 95 to 135 degrees with respect to the axis of elongation of the lifting surface thereby creating a swept range of 5 to 45 degrees where an upward motion is created.
  • the particular angle used should be that which, in harmony with the length of the tine from the pivot, creates a desired upward displacement of a pallet sufficient to allow clearance for a lifting surface to slide underneath.
  • Figures 3(a) and 3(b) show the tine 40 in a lowered position that allows a pallet to slide onto and sit on the lifting surface substantially unobstructed.
  • the tine 40 is arranged substantially flush with the top surface of the forklift lifting surface when in the lowered position.
  • the lifting surface 50 comprises a recess or aperture 52 which the tine can pivot into. In these embodiments, the tine rotates about the hinged connection 60 and into the recess to thereby create a substantially smooth or at least unobstructed upper portion of the lifting surface.
  • the tine 40 is biased toward the inclined position by a biasing member such as a spring coiled arranged at the hinged connection so as to apply a force to rotate the tine upward about the hinged connection 60.
  • the biasing member is an elastically resilient member coupling the tine to the lifting surface such that compression of the resilient member occurs when the tine is pivoted back toward the lifting surface.
  • Figure 4 illustrates operation of the tine in further detail.
  • Figure 4(a) shows a lifting apparatus 70 approaching a milk or bread pallet 1.
  • the pallet has a sidewall ridge feature 22 located on a side wall 21 that extends to the ground .
  • the tine 40 is initially inclined toward the leading edge of the leading surface 50 such that it will contact a sidewall feature 22 of a pallet 1 at the same time or before the lifting surface would contact the pallet.
  • Figure 4(b) shows the tine engaged with the sidewall feature 22 of the pallet 1.
  • the tine By driving the tine and lifting surface toward the pallet, the tine is forced to rotate away from the pallet about the hinged connection. As the tine rotates on the arc about the hinged connection, the top portion of the tine first moves upward to cause a lifting force on the sidewall feature 22. The lifting force causes the lower edge of the pallet 1 to be lifted from the approaching lifting surface 50. The lifting surface is then driven beneath the lifted lower edge of the pallet to thereby support the base of the pallet.
  • Figure 4(c) shows the lifting surface driven further beneath the pallet.
  • the tine 40 continues to be forced to rotate away from the pallet, past a vertical orientation and eventually becomes disengaged from the sidewall feature 22. Once the tine is disengaged from the pallet, the weight of the pallet is taken by the lifting surface.
  • Figure 4(d) shows the lifting surface driven beneath the pallet 1 and the tine 40 has rotated into the lowered position.
  • the tine is held into the lowered position by the weight of the pallet on the top of the lifting surface overpowering the biasing element.
  • the biasing element causes the tine to rotate from the flat position back to the inclined position where it is ready to engage another pallet.
  • a lifting surface equipped with a tine is capable of enabling pickup of pallets from the ground, but may also be used to separate one or more pallets from a stack of pallets.
  • Figure 5 and Figure 6 show a lifting surface 50 and tines 40 cleaving a pallet from a stack of pallets.
  • Figure 5 also shows an embodiment whereby a lifting surface 50 is configured with two tines 40. Any number of tines could be used to create the engagement stability and load spreading that is desired.
  • Figures 7(a) - 7(d) show views of an embodiment of an assembly comprising a flange structure 42 surrounding the recess 52 where the tine is in the lowered position.
  • the flange 42 comprises one or more apertures 43 where fasteners can be inserted to thereby secure the assembly to a lifting surface.
  • FIG. 7 shows in detail the hinged connection 60 comprising a pin passing through an aperture 61 in the flange and an aperture in the lower end of the tine 40.
  • a coiled spring 80 is located about the hinged connection 60 and adapted to bias the tine in the upright and inclined position as shown.
  • the tine 40 comprises a nonlinear form comprising a stepped portion 44, comprising a Z-shaped profile substantially as shown.
  • the stepped portion allows the leading edge of the tine 41 to extend further from the leading edge of the lifting surface while reducing of the overall height of the tine 40 above the lifting surface.
  • Figures 13 to 19 show a further exemplary embodiment whereby there is a device for attachment to a lifting apparatus 102 with a lifting surface 104.
  • Figure 15 and Figure 16 show a particular exemplary embodiment of the device that operates by engaging with a product to be lifted to allow the lifting surface to pass beneath without striking the side surface of the product and causing damage.
  • the device features has arm 110 extending from an end that has a pivotal attachment 112 to the lifting a pparatus 102.
  • the pivotal attachment 112 is provided by, for example, a pivot bearing.
  • the arm 110 extends to an end distal from the lifting apparatus 104, or in other words, outward and toward the lifting surface 104 and in direction of where the product will be engaged at the leading edge of the lifting surface.
  • the distal end of the arm has a caster wheel 113 and a product interface component 501 adapted to engage the side of a product to be lifted.
  • the wheel is replaced by a skid, roller or similar mechanism that allows the distal end of the arm to move over the ground without causing undue friction or wear to the mechanism.
  • the product interface component 501 may be a plate arranged to span parallel to the product to be lifted and may have one or more protruding parts that have a shape and size for engaging with a side contour of the product.
  • an electro- adhesive surface is provided at the interface between the end of the arm and the product.
  • Electro-adhesive surface operate by being energised so as to cause an electrostatic charge that operates to cause an attractive force to other proximate surfaces.
  • De-energising the electro-adhesive surface nulls the electrostatic charge when the product is to be released.
  • Figure 13 shows an example of the product interface component having a plate surface 302 having protruding features 502 with an upper surface 501 adapted to engage with a product.
  • Figure 14 shows an example of a product 601 that has sidewalls featuring a recess 602. The protrusions 502 are adapted to engage with the recesses 602.
  • the distal end of the arm is moveable between at least a distal position, relative to the lifting apparatus, where the wheel 113 and interface component 502 extend beyond the lifting surface, and a retracted position where the caster wheel 113 and interface component 502 are moved back and substantially away from the lifting surface.
  • the caster wheel and interface component are moved from the distal to the retracted position by the lifting apparatus being driven into the side of a product to be lifted.
  • the arm is biased into the extended position by a spring 111. When the lifting apparatus 102 engages a product, the spring 111 force is overcome to and the arm 110 is retracted. During the retraction process, energy is stored in the spring 111.
  • the stored spring energy is released to deploy the caster wheel and interface component outward by extending the arm.
  • the spring is contained within the interior, or around the exterior of the arm 110 that comprises collapsible and telescopic tube members.
  • the arm is attached to the lifting a pparatus by a mechanism that allows the pivotal attachment to slide back.
  • the arm has one or more telescopic sections that allow the arm to collapse without extending rearward.
  • FIGS 17(a)-(d) Operation of the device is illustrated in Figures 17(a)-(d) where the lifting surface of a lifting apparatus is shown approaching a stack of product to be lifted.
  • the product picked up by forklifts is sitting on pallets which have large openings for tines or forks to enter.
  • an action is needed to lift the product prior to inserting a lifting surface under the product with a motion that does not cause damage to the product.
  • Figure 17(a) shows the lifting surface of a lifting apparatus approaching a stack of palletised loads to be lifted.
  • the interface component is extended beyond the leading edge of the lifting surface.
  • Figure 17(b) shows the interface component first engaging with a product side surface contour as the lifting apparatus drives the lifting surface forward.
  • Figure 17(c) shows the lifting surface driven further toward the product.
  • the leading edge of the lifting surface is engages with the wheel which rolls over the leading edge and is displaced upward. Simultaneously, an upward force is imparted to the engaged side of the product to also displace it upward.
  • the product side nearest to the lifting surface being lifted a small amount during this engagement allows the lifting surface to be driven beneath the product without contacting, or at least impacting upon the product side surface.
  • Figure 17(d) shows the interface component in the retracted position where the arm has been telescopically collapsed or at least extended backward. The spring stores energy from the retraction process ready for release to extend the arm once the load is dropped from the lifting surface.
  • Figures 18 to 20 show perspective views of components of one embodiment of the device.
  • Figure 21 and Figure 22 show a further embodiment that is a variation of the
  • Figure 21 shows the arm 110 extending from a lifting apparatus toward a product 601 to be lifted.
  • the product 601 has a side surface profile or contour 603 adapted for engagement.
  • the end of the arm 110 supports a wheel, caster or roller 113, and, in some embodiments, the tine 40 as described with reference to Figures 2 to 7.
  • Components of the tine as shown in Figure 21 and 22 comprise a second arm or extension 120 extends from the arm 110 from a hinged or pivotal connection 121.
  • the pivotal connection 121 allows the extension 120 to pivot or rotate relative to the arm angle 110.
  • the product interface component 502. At the end of the extension 120 is the product interface component 502.
  • the product interface component 502 is in turn pivotally attached to the extension arm 120 but a hinged connection 122.
  • a hinged connection 122 allow the product interface to conform its interface surface to best fit the side surface contours of the product 601 to be lifted.
  • Figure 22 shows the lifting apparatus, having moved toward the product to be lifted from the position indicated in Figure 21, and engaging with the product.
  • the product interface component 502 contacts the product as the lifting apparatus moves forward.
  • a compression force is applied to the extension arm 120 as the lifting apparatus moves closer.
  • the compression force acts to create a force vector that aligned between the wheel 113 and the product interface component 502.
  • the force vector imparts a force on the product so as to vertically displace the engaged side thereof.
  • the vertical displacement of the leading edge of the product allows lifting surface to be driven beneath the product without contacting, or at least impacting upon the product side surface.
  • the extension arm 120 and product interface component are biased toward the inclined position by a biasing member such as a spring coiled arranged at the hinged connection 121.
  • the biasing member is an elastically resilient member coupling the tine to the lifting surface such that compression of the resilient member occurs when the tine is pivoted back toward the lifting surface.
  • the distal end of the arm 110 is moveable between at least a distal position, relative to the lifting apparatus, where the wheel 113 and interface component 501 extend beyond the lifting surface, and a retracted position where the caster wheel 113 and interface component 502 are moved back and substantially away from the lifting surface.
  • the caster wheel and interface component are moved from the distal to the retracted position by the lifting apparatus being driven into the side of a product to be lifted.
  • the arm is biased into the extended position by a spring 111. When the lifting apparatus 102 engages a product, the spring 111 force is overcome to and the arm 110 is retracted. During the retraction process, energy is stored in the spring 111.
  • the stored spring energy is released to deploy the caster wheel and interface component outward by extending the arm.
  • the spring is contained within the interior, or around the exterior of the arm 110 that comprises collapsible and telescopic tube members.
  • Figure 23 and Figure 24 show a further embodiment that is a variation of the
  • the product to be lifted is configured such that a flat side surface extends to ground level and a recess adapted to receive a lifting surface is not provided. Use of the lifting surface would ordinarily cause the leading edge of the lifting surface to be driven into the side of the product and cause damage.
  • Figure 23 shows a tipping arm 140 attached to a lifting apparatus 102 with a lifting surface 104.
  • the tipping arm is operable to engage a product to be lifted 601 by engaging with one the side surface of the product.
  • the distal end 141 of the tipping arm 140 distal is configured to engage with one or more contours or edges in the side surface of the product.
  • the tipping arm allows the lifting surface 104 of the lifting apparatus 102 to pass beneath the product and avoid the lifting surface contact or at least colliding with the side surface of the product.
  • the tipping arm 140 extends from a pivotal connection to the lifting apparatus 102 and toward a distal end.
  • the distal end of the tipping arm is operable to engage, directly or indirectly, with the product to be lifted.
  • the distal end 141 of the tipping arm 140 comprises a product interface component configured especially to engage harmoniously with the side surface of the product.
  • the tipping arm 140 is arranged to engage with the product to be lifted, when driven toward and into the product to be lifted, such that a tipping force is imparted on the product by the engaged side of the product being vertically displaced so as to allow the lifting surface to pass beneath.
  • the tipping arm disengages with the side surface of the product and rotates freely upward and toward the lifting mast 101. In this way, the tipping arm engages with the product only while the lifting surface is to first engage beneath the product, and is clear of the lifting surface as the product is positioned on the surface.
  • the tipping arm 140 is biased into a lower position as shown by Figure 23.
  • the tipping arm hinges freely from the lifting apparatus and is gravitationally positioned into the lower position.
  • the following description relates to an invention for use together or independently with the above described embodiments.
  • the following invention is most useful when two stacks of pallets are arranged in a side-by-side configuration as can be facilitated by the above described embodiments where a pallet is able to be engaged by the nonconventional side surface.
  • Figures 9(a) shows side profile and Figure 9(b) shows a perspective view of a lifting apparatus 102 particularly suitable for the transportation of small palletised loads in confined environments.
  • the lifting apparatus 102 may that described in US patent application 20140299417 Al.
  • the lifting apparatus 102 has first and second drive wheels aligned 105 about and spaced along an axis of rotation.
  • Each of the drive wheels 105 has at least one motive device adapted to drive, either together or independently.
  • the first and second drive wheels enable that motion and steering of the lifting apparatus. In particular, a zero turning radius can be achieved.
  • the lifting a pparatus depicted has a mechanism for lifting stacks of palletised loads and the mechanism includes one or more lifting surfaces 104 for engaging beneath a palletised load to be lifted.
  • the mechanism further includes a mast 101 extending up from the lifting surface 104 which, in some embodiments, extends from the rear of the lifting surface so as to be tilted with the lifting surface.
  • the mast 104 may be mounted to the chassis of the lifting apparatus and positioned so as to be proximate the surface of a load on the lifting surface.
  • the lifting apparatus 102 may be further operable to tilt, and raise the lifting surface to stabilise a load and also provide ground clearance.
  • the mast and/or other rearward surface proximate the palletised load has a plurality of pegs arranged to project toward the front of the apparatus to engage with a load positioned on the lifting surfaces.
  • Figure 11 shows a perspective view
  • Figure 12 shows a front view of the preferred arrangement of the pegs 100 attached to a lifting mast 101 of a lifting mechanism of a lifting apparatus.
  • the pegs are sized and positioned so as to engage with one or more surface contours of a palletised loads such as shown in Figure 1 and arranged as shown in Figure 10.
  • the pegs engage in a substantially axial direction with the palletised loads and under lateral forces engage with a side surface that acts to substantially prevent lateral movement of a side-by- side stack configuration, yet allow the pallets or crates to be loaded and unloaded from the lifting surface in a substantially unhindered manner.
  • the pegs 100 are arranged as a pair laterally spaced and generally extending toward the front of the lifting surface in the direction which a load is to be engaged.
  • the pegs 100 extend substantially parallel to the plane of the lifting surface. However, each peg in the pair of pegs is arranged to taper laterally outward from the centre of the lifting mast 101.
  • the angle of the tapered alignment is in the range of approximately 5 to 45 degrees;
  • the pegs may extend from the mast any length useful for engaging with a particular palletised load. For example, if a palletised load has a side surface contour approximately 5 cm deep, the pegs may extend a similar distance so as to engage harmoniously with the side surface.
  • the orientation of the pallet on the forklift lifting surface facilitates loading of pallets onto a truck rotated 90 degrees compared to conventional loading ability.
  • the arrangement of pallets in this orientation allows a greater total number of pallets to be loaded onto the flat bed of a truck.
  • the 3 x 6 configuration of pallets on a track bed is forgone and a new 4 x 5 arrangement of pallets is possible, a 10% improvement in truck storage capacity.
  • Figure 8 shows the 3 x 6 arrangement (upper) of the prior art compared to the 4 x 5 arrangement (lower).

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

La présente invention concerne un appareil de levage de charge qui présente un châssis et une surface de levage s'étendant depuis le châssis et actionnable pour porter et soulever verticalement une charge, l'appareil comprenant un dispositif actionnable pour venir en prise avec une charge devant être soulevée et pour la faire basculer afin de permettre un bord d'attaque de la surface de levage de passer sous la charge, le dispositif ayant au moins un bras s'étendant à partir d'un accessoire pivotant vers le châssis ou vers la surface de levage, le bras portant un élément d'interface de roue et de charge à un emplacement distal par rapport à l'accessoire pivotant. L'élément d'interface de charge est conçu pour venir en prise avec la surface latérale de la charge à soulever et l'accessoire pivotant est conçu pour un montage rétractable par rapport à la surface de levage de sorte que l'extrémité distale du ou des bras est mobile entre une position déployée distale et une position rétractée par rapport à la surface de levage. Dans la position déployée, l'élément d'interface de roue et de charge est déplacé vers l'avant de la surface de levage de sorte que la ou les roues sont en contact avec le sol à l'avant de la surface de levage, et dans la position rétractée, la surface de levage est sous le ou les éléments d'interface de roue et de charge.
PCT/NZ2016/050123 2015-08-03 2016-08-03 Accessoire pour un appareil de levage WO2017023179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ71070815 2015-08-03
NZ710708 2015-08-03

Publications (1)

Publication Number Publication Date
WO2017023179A1 true WO2017023179A1 (fr) 2017-02-09

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999054249A1 (fr) * 1998-04-17 1999-10-28 Liftcon Technologies Limited Chariot elevateur transportable, a bras de levage telescopique
US6033177A (en) * 1998-07-10 2000-03-07 Kooima; Roger D. Forklift attachment
US20010005479A1 (en) * 1998-03-13 2001-06-28 Jerr-Dan Corp. Independent wheel-lift having a chassis mounted pivot point
US20080308359A1 (en) * 2007-06-15 2008-12-18 Waltz Lucas B Quick change load wheel assembly
US20130127126A1 (en) * 2011-05-13 2013-05-23 Dan Lantz Pallet truck with lift indicator assembly and associated methods

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010005479A1 (en) * 1998-03-13 2001-06-28 Jerr-Dan Corp. Independent wheel-lift having a chassis mounted pivot point
WO1999054249A1 (fr) * 1998-04-17 1999-10-28 Liftcon Technologies Limited Chariot elevateur transportable, a bras de levage telescopique
US6033177A (en) * 1998-07-10 2000-03-07 Kooima; Roger D. Forklift attachment
US20080308359A1 (en) * 2007-06-15 2008-12-18 Waltz Lucas B Quick change load wheel assembly
US20130127126A1 (en) * 2011-05-13 2013-05-23 Dan Lantz Pallet truck with lift indicator assembly and associated methods

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