WO2013164780A1 - Chariot porte-charge et procédé de déchargement d'un chariot porte-charge - Google Patents

Chariot porte-charge et procédé de déchargement d'un chariot porte-charge Download PDF

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Publication number
WO2013164780A1
WO2013164780A1 PCT/IB2013/053466 IB2013053466W WO2013164780A1 WO 2013164780 A1 WO2013164780 A1 WO 2013164780A1 IB 2013053466 W IB2013053466 W IB 2013053466W WO 2013164780 A1 WO2013164780 A1 WO 2013164780A1
Authority
WO
WIPO (PCT)
Prior art keywords
load
support structure
truck
load support
ground
Prior art date
Application number
PCT/IB2013/053466
Other languages
English (en)
Inventor
Tiran Moshe
Doron Moshe
Original Assignee
Van Der Walt, Louis, Stephanus
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 Van Der Walt, Louis, Stephanus filed Critical Van Der Walt, Louis, Stephanus
Publication of WO2013164780A1 publication Critical patent/WO2013164780A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
    • B62B3/04—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment
    • B62B3/06—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground
    • B62B3/0612—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor involving means for grappling or securing in place objects to be carried; Loading or unloading equipment for simply clearing the load from the ground power operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B2203/00—Grasping, holding, supporting the objects
    • B62B2203/70—Comprising means for facilitating loading or unloading
    • B62B2203/72—Comprising means for facilitating loading or unloading means for pushing or pulling the load from/onto the platform

Definitions

  • This invention relates to load trucks and to methods of offloading load units. More particularly, the invention relates to a load truck for moving loads units laden on pallets or slip sheets and to a method of offloading such a load unit.
  • loads trucks for moving palletised load units for the purpose of transportation and storage are well known.
  • load trucks which are used to move palletised load units, including low-lift pallet trucks and fork lift trucks.
  • Pallet trucks may be propelled manually or by a motor. Some pallet trucks and fork lift trucks are operated by a ride-on operator and others by an operator on foot.
  • a more recently developed method of moving load units for the purpose of transportation and storage is to load them onto slip sheets instead of pallets.
  • Proper moving of load units laden on slip sheets requires specialised load trucks. These include fork lift trucks fitted with so-called push/pull mechanisms for pulling load units onto their forks and for pushing them from the forks, and so-called roller forks.
  • the push/pull mechanism includes a travelling push/pull member which is connected to a fixed part by means of a scissor mechanism, which maintains a fixed orientation of the push/pull member, and a hydraulic cylinder assembly acting between components of the scissor mechanism for effecting displacement of the push/pull member.
  • load trucks used for moving palletized or load sheet laden load units may be classified into low-lift trucks and fork lift trucks.
  • Low-lift trucks provide for only limited lifting of a load unit to clear the ground, whereas fork lift trucks provide for sufficient lifting of a load unit for inter alia stacking purposes.
  • a low-lift truck may be either human propelled or motor propelled.
  • Fork lift trucks typically are motor propelled.
  • Walk-along load trucks which are operable by a human operator on foot, may be either operator propelled or motor propelled.
  • Operator propelled low-lift trucks sometimes referred to as hand trucks, typically represent the low cost end of the spectrum of load trucks.
  • One particular load truck with which the Applicant is familiar is disclosed in
  • a load truck the load truck includes: a load support structure for a load unit, the structure defining a front end, a rear end and a longitudinal direction, and including at least one retractable ground wheel; and
  • a load shifting mechanism including:
  • a travelling member defining an upright front face, above the load support structure and transverse to the load support structure, for operatively pushing the load from the load support structure, the travelling member being displaceable in the longitudinal direction between a rearward position, intermediate the fixed member and the front end of the load support structure and remote from the front end, and a forward position proximate the front end of the load support structure;
  • an actuation mechanism operable to displace the travelling member between the rearward position and the forward position on the load support structure
  • the load support structure includes a bearing surface on an underside thereof for bearing frictionally against the ground or base surface, the ground wheel being displaceable between two positions, namely:
  • the load support structure may be in the form of a fork member.
  • the load support structure may include at least two spaced apart, longitudinally extending support elements.
  • Each support element may be provided with at least one retractable ground wheel and at least one bearing surface.
  • the retractable wheel may be hydraulically displaceable, or it may be mechanically displaceable, e.g. by means of a torsion tube assembly.
  • the bearing surface may be embodied by a brake member mounted on an underside of the load support structure or an underside of the load support element.
  • the break member may be a brake block of any suitable material, e.g. a metal or a polymeric material such as rubber or plastic.
  • the brake member may be integral with the load support structure or the load support element, e.g. it may extend downwardly from the underside thereof.
  • the bearing surface may be integral with the underside of the load support structure or the load support element.
  • the load shifting mechanism may include a scissor mechanism interconnecting the travelling member and the fixed member.
  • the scissor mechanism may maintain a fixed orientation of the travelling member relative to the support structure.
  • the actuation mechanism may be a hydraulic cylinder assembly.
  • the hydraulic cylinder assembly may have opposite ends thereof connected to the fixed member and the travelling member respectively, and may be operable to exert opposing forces between the members to displace the travelling member from the rearward position to the forward position on the load support structure.
  • the hydraulic cylinder assembly may have a central axis disposed in the longitudinal direction of the load support structure.
  • the hydraulic cylinder assembly may be a telescopic cylinder assembly.
  • the hydraulic cylinder assembly may be double acting.
  • the actuation mechanism is a push/pull mechanism and may be provided with a slip sheet gripping mechanism for gripping a slip sheet for pulling a load unit laden on the slip sheet onto the load support formation.
  • the load truck may be a low-lift truck, in which the load support structure is adjustable only within a limited height range near ground level.
  • the load truck may be operable by a human operator on foot. It may be propelled by the operator.
  • the load truck of the invention may be of any type essentially as herein envisaged, i.e. a low-lift truck or a fork lift truck, human propelled or motor propelled, and ride-on or walk-along.
  • a method of offloading a load unit against an object including:
  • the load support structure defining a front end, a rear end and a longitudinal direction, and including at least one retractable ground wheel and a bearing surface on an underside of the load support structure for bearing frictionally against the ground or base surface, the ground wheel being displaceable between an extended position in which it stands proud of the bearing surface and supports the load support structure allowing displacement thereof, and a retracted position in which the bearing surface stands proud of the ground wheel, such that the bearing surface frictionally engages the ground or base surface and acts as a friction brake, inhibiting displacement of the load support structure, and a load shifting mechanism operable to push the load unit from the load support structure in a forward direction of the load support structure;
  • the load truck is anchored by retracting the at least one retractable ground wheel to bring the bearing surface into abutment with the ground or base surface, resulting in the load shifting mechanism pushing the load unit into abutment with the object.
  • the method may include, during at least a last stage of the pushing of the load unit, extending the at least one retractable wheel so as to lift the bearing surface from abutment with the ground or base surface, thereby to allow the load truck to be displaced in a rearward direction relative to the load unit being pushed from the load support structure.
  • the load truck used in the method may be a low-lift truck, in which the load support structure is adjustable only within a limited height range near ground level.
  • the load truck may be operable by a human operator on foot. It may be propelled by the operator.
  • FIGURE 1 shows a rear three-dimensional view of a load truck, in accordance with the invention, in a first operative configuration thereof;
  • FIGURE 2 shows a rear three-dimensional view of the load truck of
  • FIGURE 3 shows a side view of the load truck of Figure 1 , in the first operative configuration; shows a side view of the load truck of Figure 1 , in the second operative configuration;
  • FIGS. 1 show respectively side views of the load truck of Figure 1 , in progressively offloading a load unit against an object.
  • reference numeral 10 generally indicates a load truck, in accordance with the invention.
  • the load truck 10 is a low-lift truck.
  • the load truck 10 includes:
  • a load support structure in the form of a fork 12 including two parallel, spaced apart fork beams 14;
  • a bogie mounting assembly 1 6 mounted on rear ends of the fork beams 14;
  • a bogie 18 including a pair of rear wheels 20;
  • each fork beam 14 for bearing frictionally against the ground or base surface
  • a retractable front wheel 21 supporting the respective fork beams 14, the wheels 21 being displaceable by a torsion tube assembly (not shown) between an extended position in which they stand proud of the bearing surfaces 19 and support the fork beams 14 allowing displacement thereof, and a retracted position in which the bearing surfaces 19 stand proud of the wheel 21 , such that the bearing surfaces 19 frictionally engage the ground or base surface and act as a friction brake, inhibiting displacement of the fork beams 12;
  • a lifting mechanism including a hydraulic jack 22, for lifting and lowering the bearing surfaces 19 by retracting and extending the retractable wheels 20 and 21 ;
  • the fork beams 14 extend in a longitudinal direction of the fork 12.
  • the fork 12 has a front end 13.1 and a rear end 13.2.
  • Each fork beam 14 includes a series of longitudinally spaced load support rollers 15, a bearing surface 19 and a retractable wheel 21 .
  • the load truck 10 is manually operated and propelled by a human operator on foot.
  • the operator uses the handle 24 for actuating the hydraulic jack 22 for extending and retracting the wheels 21 , thereby lifting and lowering the fork 12.
  • the wheels 21 are typically connected to the handle by a torsion tube assembly within the forks 14 (not shown) which enables the wheels 21 to be retracted and extended by operation of the handle 24 and the hydraulic cylinder 22.
  • the hydraulic cylinder 22 when the handle 24 is lowered, the hydraulic cylinder 22 is actuated and the torsion tube assembly (not shown) acts to extend the retractable wheels 24 so that they stand proud of the bearing surfaces 19, thereby lifting the forks 14 and lifting the bearing surfaces 19 away from frictional abutment with the ground, for example as shown in Figures 6 and 7.
  • the wheels 21 are retracted as shown in any one of Figures 1 to 4, the forks 14 are lowered and the bearing surfaces 19, which then stand proud of the retractable wheels 21 , are brought into frictional abutment with the ground.
  • the load truck 10 includes a load shifting mechanism 25 including:
  • the scissor mechanism 30 provides for displacement of the travelling frame 28 between a rearward position, as shown in Figures 1 , 3 and 5, and a forward position, as shown in Figures 2, 4 and 7.
  • the scissor mechanism 30 maintains the travelling frame 28 parallel to the fixed frame 26 so that an upright front face 29 (see Figure 3) of the travelling frame 28 is maintained upright and transverse relative to the fork 12.
  • a front end of the hydraulic cylinder assembly 32 is connected to a centre of the travelling frame 28 whereas a rear end of the hydraulic cylinder assembly 32 is connected to the fixed frame 26. More particularly, a rear portion of the hydraulic cylinder assembly 32 passes through a centre of the fixed frame 26 and is connected thereto by means of two opposite brackets 34 projecting rearwardly from the fixed frame 26, with a dowel pin 35 releasably interconnecting a rear end of the hydraulic cylinder assembly 32 and the brackets 34.
  • the hydraulic cylinder assembly 32 is selectively extended or contracted, thereby displacing the travelling frame 28 forwardly or rearwardly, respectively.
  • the load truck 10 may be used in the configuration shown in Figure 1 , with the travelling frame 28 in its rearward position, for moving a palletized load unit in conventional fashion.
  • the load truck 10 may be used for moving a load unit laden on a slip sheet.
  • the load shifting mechanism 25 may be provided with a slip gripping mechanism (not shown) along a bottom edge 37 (see Figure 3) of the travelling frame 28.
  • a slip gripping mechanism may be essentially conventional and therefore does not require illustration or description herein.
  • a load unit (or simply a load) 40 has been laden on a slip sheet 42 and supported on the fork 12 of the load truck 10.
  • the load truck 10, with the load unit 40 thereon has been pushed into a shipping container 44, which has a floor 46 and an end wall 48, into the position shown in which the front end 13.1 of the fork 12 is positioned at a short distance from the end wall 48, e.g. at a distance approximately one third to one half the length of the load unit 40 from the end wall 48.
  • the handle 24 is placed in the upright position thereby retracting the retractable wheels 21 and placing the bearing surfaces 19 in frictional abutment with the floor 46. In this position, the bearing surfaces 19 act as frictional brakes thereby inhibiting the load truck 10 from being displaced, i.e. the weight of the load 40 on the forks 14 and the bearing surfaces 19 on the floor 46 prevents the load truck 10 from being moved.
  • the load truck 10 is then displaceable, i.e. the forks 14 are supported by the wheels 21 and not the bearing surfaces 19.
  • the hydraulic cylinder assembly 32 has been completely extended.
  • the load unit 40 and the slip sheet 42 which were flush against the wall ( Figure 6) have, by acting against the travelling frame 28, displaced the load truck 10 rearwardly with respect to the load unit 40 into a position in which the load unit is entirely supported on the floor 46 in front of the fork 12.
  • the load shifting mechanism 25 without the braking provided by the bearing surface 19 can be useful for shifting a load 40, the reactive force of the weight of the load 40 can result in inadvertent displacement of the load truck 10.
  • a bearing surface 19 with no load-shifting abilities may be unnecessary.
  • load truck 10 in the above example is a walk-along, human propelled, low-lift truck
  • a load truck in accordance with the invention, may be of any type essentially as herein envisaged, i.e. a low-lift truck or a fork lift truck, human propelled or motor propelled, and ride-on or walk-along.
  • the retractable wheels 21 , the bearing surfaces 19 and the load shifting mechanism 25 may alternatively be provided on a motor propelled fork lift truck.

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

Abstract

L'invention concerne un chariot porte-charge (10) comprenant une structure de support de charge (12) qui comprend au moins une roue rétractable en contact avec le sol (21) et une surface d'appui (19) sur un côté inférieur de celle-ci à des fins d'appui par friction contre le sol. Le chariot porte-charge (10) comporte par ailleurs un mécanisme de déplacement de charge (25) qui comprend un élément fixe (26) et un élément mobile (28) permettant de pousser fonctionnellement l'unité de charge (40) depuis la structure de support de charge (12), et un mécanisme d'actionnement (27) servant à déplacer l'élément mobile (28) par rapport à l'élément fixe (26). La roue en contact avec le sol (21) est en mesure d'être déplacée entre une position étendue dans laquelle la surface d'appui (19) entre en prise par friction avec le sol et tient lieu de frein à friction et une position rétractée dans laquelle la surface d'appui (19) est séparée du sol, pour ainsi permettre le déplacement de la structure de support de charge (12).
PCT/IB2013/053466 2012-05-02 2013-05-02 Chariot porte-charge et procédé de déchargement d'un chariot porte-charge WO2013164780A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KEKE/P/2012/001559 2012-05-02
KE155912 2012-05-02

Publications (1)

Publication Number Publication Date
WO2013164780A1 true WO2013164780A1 (fr) 2013-11-07

Family

ID=48672671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/053466 WO2013164780A1 (fr) 2012-05-02 2013-05-02 Chariot porte-charge et procédé de déchargement d'un chariot porte-charge

Country Status (1)

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WO (1) WO2013164780A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170218A (zh) * 2020-02-12 2020-05-19 吴虎群 一种可自动导向的叉车
CN112849246A (zh) * 2021-01-15 2021-05-28 隋文琪 一种建筑工程用模板搬运装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372769A (en) * 1966-04-29 1968-03-12 Clark Equipment Co Material handling vehicle
DE19934993A1 (de) * 1999-07-26 2001-02-08 Jungheinrich Ag Radarme für Gabelniederhubwagen
US20060125196A1 (en) * 2004-12-15 2006-06-15 Grand Steer Inc. Steering device for pallet truck
BE1016890A3 (nl) * 2005-12-13 2007-09-04 Jan Construct Nv Verbeterd transportplatform.
WO2011009866A1 (fr) 2009-07-21 2011-01-27 Epcos Ag Piézoactionneur avec contacts électriques
WO2011098966A1 (fr) 2010-02-12 2011-08-18 Van Der Walt, Louis, Stephanus Chariot porte-charge et procédé de déchargement d'une unité de charge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372769A (en) * 1966-04-29 1968-03-12 Clark Equipment Co Material handling vehicle
DE19934993A1 (de) * 1999-07-26 2001-02-08 Jungheinrich Ag Radarme für Gabelniederhubwagen
US20060125196A1 (en) * 2004-12-15 2006-06-15 Grand Steer Inc. Steering device for pallet truck
BE1016890A3 (nl) * 2005-12-13 2007-09-04 Jan Construct Nv Verbeterd transportplatform.
WO2011009866A1 (fr) 2009-07-21 2011-01-27 Epcos Ag Piézoactionneur avec contacts électriques
WO2011098966A1 (fr) 2010-02-12 2011-08-18 Van Der Walt, Louis, Stephanus Chariot porte-charge et procédé de déchargement d'une unité de charge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170218A (zh) * 2020-02-12 2020-05-19 吴虎群 一种可自动导向的叉车
CN111170218B (zh) * 2020-02-12 2021-08-06 广东嘀卜工业互联网科技有限公司 一种可自动导向的叉车
CN112849246A (zh) * 2021-01-15 2021-05-28 隋文琪 一种建筑工程用模板搬运装置
CN112849246B (zh) * 2021-01-15 2022-05-31 中国机械工业第五建设有限公司 一种建筑工程用模板搬运装置

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