EP2647556B1 - Charriot à main et procédé pour l'amélioration de son ergonomie - Google Patents

Charriot à main et procédé pour l'amélioration de son ergonomie Download PDF

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Publication number
EP2647556B1
EP2647556B1 EP20120163349 EP12163349A EP2647556B1 EP 2647556 B1 EP2647556 B1 EP 2647556B1 EP 20120163349 EP20120163349 EP 20120163349 EP 12163349 A EP12163349 A EP 12163349A EP 2647556 B1 EP2647556 B1 EP 2647556B1
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EP
European Patent Office
Prior art keywords
truck
tiller arm
steering position
operator
neutral steering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP20120163349
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German (de)
English (en)
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EP2647556A1 (fr
Inventor
Henrik Larsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Material Handling Manufacturing Sweden AB
Original Assignee
BT Products AB
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Publication date
Application filed by BT Products AB filed Critical BT Products AB
Priority to EP20120163349 priority Critical patent/EP2647556B1/fr
Publication of EP2647556A1 publication Critical patent/EP2647556A1/fr
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Publication of EP2647556B1 publication Critical patent/EP2647556B1/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
    • B66F9/07568—Steering arrangements

Definitions

  • the invention relates to the area of tiller arm trucks and a method for improvement of the ergonomics of tiller arm trucks.
  • a tiller arm truck is manoeuvred by means of a tiller arm which is mounted on the truck body and which can be rotated in right hand circuit or in left hand circuit by the operator.
  • the truck can be driven onwards or backwards, i.e. in a direction from or towards the truck forks.
  • the operator is usually turned away from the truck body, i.e. in the direction of travel, when the truck is driven in a direction from the forks.
  • the mentioned problem is solved by designing the tiller arm truck so that the tiller arm can be rotated around an essentially vertical axis and be set in a first neutral steering position and in a second neutral steering position, wherein the first neutral steering position and the second neutral steering position differ by a angle ⁇ being less than 90 ° from each other.
  • the operator has the possibility to adjust the position of the tiller arm around an essentially vertical axis, so that a more natural posture can be taken.
  • the neutral steering position of the tiller arm i.e. the position for straight on driving
  • the operator can hold the tiller arm with his arm stretched at his side. This makes it easier for the operator to turn the upper part of his body in the direction of travel.
  • the angle ⁇ between the first neutral steering position and the second neutral steering position is preferably in the interval of 5-45°, or more preferably 15-35°.
  • the size of the angle depends on the form and dimensions of the tiller arm, and also on the length and personal preferences of the operator.
  • the angle ⁇ is an angle of rotation around an essentially vertical axis.
  • the axis is defined as being essentially vertical, since it can be understood that the axis will not be directed exactly vertical when the truck is driven on a sloping ground. Said axis runs vertically through the track body.
  • the angle ⁇ is preferably chosen so that the operator can take an ergonomically correct posture when driving the tiller arm truck in a direction away from the forks.
  • the angle ⁇ is advantageously chosen so that the second neutral steering position makes it possible for an operator, who is turned away from the truck, to assign the tiller arm equally large deflection in both directions. In this way a good manoeuvrability is obtained.
  • the tiller arm truck can further comprise a platform on which the operator can stand.
  • the angle ⁇ be chosen so that the second neutral steering position makes it possible for the operator, who is on the platform and is turned away from the truck, to assign the tiller arm equally large deflection in both directions.
  • the invention is not limited to tiller arm trucks with a platform. It can also be used on tiller arm trucks without a platform or with a hinged platform, where the operator walks on the ground and steers the truck.
  • the tiller arm truck can be of the steer-by-wire type, wherein the tiller arm truck comprises an electronic steering circuit, which makes it possible to change the neutral steering position, i.e. the tiller arm can be set to a first neutral steering position and to a second neutral steering position.
  • the tiller arm truck comprises an electronic steering circuit, which makes it possible to change the neutral steering position, i.e. the tiller arm can be set to a first neutral steering position and to a second neutral steering position.
  • a software code steering the electronic steering circuit can be completed with instructions making it possible to change the neutral steering position.
  • the invention can be applied to an existing tiller arm truck of the steer-by-wire-type by updating software, which is executed in a computer in the truck.
  • the electronic steering circuit or the computer can be designed so that the change of the neutral steering position is reset when the operator leaves said platform.
  • the risk is eliminated that the operator, or another operator, disregards the change of the neutral steering position and unintentionally steers the truck in a wrong direction.
  • the invention can also be applied to a tiller arm truck, which is not of the steer-by-wire-type.
  • the truck might comprise locking means, which renders it possible to change the neutral steering position by releasing said locking means temporarily when the neutral steering position is changed.
  • the tiller arm can comprise hinge means, which makes it possible to change the neutral steering position by folding the tiller arm around the hinge means.
  • the tiller arm truck can comprise indicating means to indicate that he neutral steering position has been changed.
  • Said indicating means can comprise one or several indicating lamps.
  • the indicating means can be integrated in the tiller arm and be designed so that the operator can see and/or feel that the neutral steering position has been changed.
  • the invention also solves the said problem by a method for improving the ergonomics of a tiller arm truck, comprising the step of setting the tiller arm of the tiller arm truck in a neutral steering position, which differs with an angle ⁇ being less than 90° from the longitudinal direction of the tiller arm truck.
  • This method offers the possibility to the operator to adjust the position of the tiller arm so that a more natural posture can be taken.
  • FIG. 1 illustrates a tiller arm truck 10 according to the invention and an operator, who drives the tiller arm truck by means of a tiller arm 20, which is attached to the body 30 of the truck.
  • the tiller arm truck has on a first side 40 load carrying means 50, in the form of forks.
  • the operator is positioned on a second side 60, opposite the first side 40, and holds the tiller arm 20 extending from the truck body 30 in a direction towards the second side 60.
  • FIG 2 shows a view seen from above the tiller arm truck according to the invention, with the tiller arm in a neutral position 20b
  • figure 3 shows a conventional tiller arm truck.
  • figure 3 is the lengthwise direction of the tiller arm 20 parallel with the straight direction 80 of travel of the conventional truck, which means that the tiller arm 20 is in a neutral steering position 20a.
  • Figure 3 shows clearly that the conventional tiller arm truck, when being driven in a direction 80 straight away from the load (nor shown) on the forks 50, forces the operator to take an unergonomical working posture. This is particularly relevant when the operator stands on the platform 70 and is positioned in front of the truck. Hence, the truck is moving in the direction 80, which the second side 60 is facing, and the operator is positioned on this second side 60.
  • Figure 2 illustrates the present invention.
  • the tiller arm 20 rotated from a first neutral steering position 20a (corresponding to what is shown in figure 3 ) to a second neutral steering position 20b.
  • the second neutral steering position 20b differs with an angle ⁇ from the direction of travel 80 of the tiller arm truck, which during a drive straight ahead coincides with the longitudinal direction 80 of the truck.
  • the tiller arm in figure 2 has a direction which differs with an angle ⁇ from the tiller arm in figure 3 . Due to this change of the neutral steering position, the operator can take a more ergonomical working position.
  • Figure 1 , 2 as well as figure 3 illustrates as described neutral steering positions 20a, 20b, i.e. positions of the tiller arm, which result in a driving straight forwards or straight backwards.
  • a neutral steering position is/are the steering wheel/wheels (not shown), which is/are mounted under the truck 10 and on which the truck is rolling, directed parallelly with the longitudinal axis 80 of the truck.
  • the position of the tiller arm in figure 3 is here called a first neutral steering position 20a and the position in figure 1 and 2 is called a second neutral steering position 20b.
  • the steering positions 20a, 20b differ from each other by an angle ⁇ .
  • the tiller arm 20 of the tiller arm truck can be rotated around a vertical axis 90, illustrated in figure 1 , during the driving of the truck.
  • a rotation leads to steering of the steer wheels of the truck.
  • the angle ⁇ is an angle of rotation around a vertical axis 90, or with other words around an axis extending in a vertical direction through the body 30 of the truck.
  • the tiller arm can be raised or lowered relatively the body 30 of the truck, by means of a horizontal axis through which the tiller arm is attached to the truck body, as illustrated in figure 1 .
  • the vertical axis 90 is not directed exactly axially when the truck is driven of a sloping ground.
  • the illustrated tiller arm truck 10 is of the steer-by-wire type, which means that there is no mechanical coupling between the steering wheel and the tiller arm 20.
  • the steering of the steering wheel/wheels is achieved by means of electronics, which is affected by the operation of the tiller arm 20 and which affects the steering wheel, for example hydraulically or electrically.
  • a truck computer 25, comprising a processor, a primary memory and a secondary memory is arranged in the tiller arm truck to receive signals from the operator and take care of the operation of the truck.
  • the truck computer provides for the change of the neutral steering position 20a, 20b.
  • the tiller arm truck 10 is of the steer-by-wire type and comprises a platform 70 for the operator
  • the truck can be adapted to reset the change of the neutral steering position 20a, 20b when the operator leaves the platform 70.
  • the tiller am truck can be provided with sensing means (not shown), which senses if an operator is positioned on the platform or not.
  • the sensing means is connected to the truck computer 25 and sends a signal when the operator leaves the platform, whereafter the truck computer automatically resets the change of the neutral steering position 20a, 20b.
  • the tiller arm truck 10 can also be adapted to indentify which operator is driving the truck 10, and to only automatically reset the change of the neutral steering position 20a, 20b when a new operator is identified.
  • a tiller am truck which is not of the steer-by-wire type, is normally steered by directly mechanically couple the tiller arm to a steering wheel.
  • means for temporarily detaching this coupling can be arranged on the truck.
  • Figure 5 shows a tiller arm truck which is not of the steer-by-wire type.
  • the change of the neutral steering position can be achieved by letting the fixing means 22 of the tiller arm around a vertical steering axis (not shown) be temporarily detachable.
  • the steering axis extends from the steering wheel (not shown) to the fixing means 22 of the tiller arm above the truck body 30.
  • the steering axis doesn't need to be directed exactly axially.
  • the tiller arm truck can be designed with a slightly inclined steering axis, i.e. an essentially vertical axis.
  • a locking means 24 in the form of a pin 24 of the fixing means 22 of the tiller arm can be displaced (as indicated by the double arrow in figure 5 ) in its longitudinal direction to in order to establish or release a positive fit between the fixing means 22 of the tiller arm and the steering axis.
  • the steering axis can for example comprise a number of holes along its periphery, into which holes the pin 24 can be inserted.
  • a non-positive fit can be used instead of a positive fit, in which case the tensioning means for example can be a wheel (not shown) on a threaded axis, which can be screwed through the fixing means 22 to abut the steering axis.
  • Figure 6 shows another example of how the change of the neutral steering position can be achieved.
  • the tiller arm is folded.
  • the tiller arm is provided with a hinge 26, around which the tiller arm can be folded.
  • the hinge 26 comprises locking means 28, which can be temporarily released in order to fold the tiller arm and set a wished neutral steering position.
  • the locking means 28 can achieve a positive fit or a non positive fit as above.
  • the tiller arm 20 comprises in its distal end a handle with a grip being transversal to the longitudinal direction of the tiller arm.
  • the handle comprises control means and different operating indicators, and can also comprise the truck computer 25.
  • the operating means are designed as buttons and rotary controls, which are used to steer the truck and its forks.
  • the operating indicators can be lamps and displays, which for example show the current velocity, charge level and height of lift.
  • special indicators 35 are provided in order to detect that the neutral steering position 20a, 20b has been changed.
  • These steering position indicators 35 are preferably designed so that an operator, who approaches the truck 10 from another task, easily can decide if the neutral steering position (20a, 20b) has been changed.
  • the truck body 30 and/or the tiller arm 20 can be provided with lightening means 35, such as light bulbs or LED's, which are easy to identify.
  • the handle can also comprise a display on which the change of the neutral steering position 20a, 20b is shown.
  • FIG 1 shows a steering position indicator 35 in the form of a lamp 35 provided in the platform 70.
  • Right and left steering position indicators 35 arranged on each side of the upper side of the truck, are suggested in figure 2 .
  • figure 5 right and left steering position indicators 35 in the form of lamps are integrated in the handle of the tiller arm, more precisely in the grip of the handle.
  • figure 6 illustrates tactile steering position indicators 35 in the form of blunt pins within the grip of the handle, which can be adapted to protrude from the surface of the grip when the steering position has been changed.
  • One or several of the shown steering position indicators 35 can be implemented one by one or several together, independent of if the truck is of the steer-by-wire type or not, and independent of on which way the truck is adapted to admit a change of the neutral steering position.
  • a first step 100 the tiller arm is released from the steering wheel of the truck. This can be achieved through that operator activates an operating means, like for example presses a button, pulls out a locking pin or turns a wheel. If the truck is of the steer-by-wire type the release is handled by the truck computer 25. If the truck has a mechanical coupling between the tiller arm and the steering wheel, the release has as effect that said mechanical coupling is broken, for example by admitting the tiller arm to rotate freely around an axis extending to a steering wheel.
  • a second step 110 the operator turns the tiller arm to a wished angle ⁇ .
  • the turning is performed around an essentially vertical axis 90.
  • This angle adjustment can be performed in discrete steps, or be performed continuously.
  • a suitable angle adjustment is in the interval 5-45°, or more suitable in the interval 15-35°. In the showed example 25° is chosen.
  • the size of the change which is needed in order for the operator to take a comfortable posture depends principally on the design of the tiller arm and on the length and preferences of the operator.
  • a third step 120 the tiller arm is locked again relatively the steering wheel of the tiller arm truck, for example by the operator deactivating the operating means. If the truck is of the steer-by-wire type, the locking is handled by the truck computer. If the truck has a mechanical coupling between the tiller arm and the steering wheel, the locking leads to an re-insertion of said mechanical coupling means. In the case that indicators 35, which indicate that the neutral steering position 20a, 20b has been changed, have been provided on the truck, these indicators can be activated in the third step 120.
  • the tiller arm truck in the showed embodiments is provided with a platform 70.
  • the invention is not limited to tiller arm trucks with a platform. It can also be used on tiller arm trucks without a platform or with a hinged platform, where the operator walks on the ground and steers the truck.

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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)
  • Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
  • Agricultural Machines (AREA)

Claims (10)

  1. Chariot à barre (10) comprenant un corps de chariot (30) et une barre (20) destinée à diriger ledit chariot à barre (10), lequel chariot à barre (10) est conçu de telle sorte que la barre (20) puisse tourner autour d'un axe sensiblement vertical (90) et puisse être placée dans une première position de direction neutre (20a) et dans une seconde position de direction neutre (20b), caractérisé en ce que la première position de direction neutre (20a) et la seconde position de direction neutre (20b) diffèrent l'une de l'autre d'un angle α inférieur à 90°.
  2. Chariot à barre (10) selon la revendication 1, dans lequel l'angle α se situe dans une plage comprise entre 5° et 45°.
  3. Chariot à barre (10) selon la revendication 1 ou la revendication 2, dans lequel l'angle α est sélectionné de telle sorte que la seconde position de direction neutre (20b) permette à un opérateur, qui est tourné dos au chariot, d'assigner de manière égale à la barre (20) une grande déviation dans les deux directions (80a, 80b).
  4. Chariot à barre (10) selon l'une quelconque des revendications précédentes, comprenant en outre une plate-forme (70) destinée à l'opérateur, dans lequel fangle α est choisi de telle sorte que la seconde position de direction neutre (20b) permette à l'opérateur, qui se situe sur la plate-forme (70) et qui est tourné dos au corps de chariot (30), d'assigner de manière égale à la barre (20) une grande déviation d'égale amplitude dans les deux directions (80a, 80b).
  5. Chariot à barre (10) selon l'une quelconque des revendications précédentes, dans lequel le chariot est du type direction à câble, et dans lequel le chariot à barre comprend un circuit de direction électronique (25), qui permet de modifier la position de direction neutre.
  6. Chariot à barre (10) selon la revendication 4 et la revendication 5, dans lequel le circuit de direction électronique (25) est conçu de telle sorte que la modification de la position de direction neutre (20a, 20b) est réinitialisée lorsque l'opérateur quitte la plate-forme (70).
  7. Chariot à barre (10) selon l'une quelconque des revendications 1 à 4, comprenant des moyens de verrouillage (24, 28) qui permettent de modifier la position de direction neutre (20a, 20b) par lesdits moyens de verrouillage (24, 28) qui sont temporairement libérés lorsque la position de direction neutre (20a, 20b) est modifiée.
  8. Chariot à barre (10) selon la revendication 7, dans lequel la barre (20) comprend des moyens d'articulation (26), qui permettent de modifier la position de direction neutre (20a, 20b).
  9. Chariot à barre (10) selon l'une quelconque des revendications précédentes, comprenant des moyens d'indication (35) destinés à indiquer que la position de direction neutre (20a, 20b) a été modifiée.
  10. Procédé destiné à améliorer l'ergonomie d'un chariot à barre (10), comprenant l'étape (110) consistant à placer la barre (20) du chariot à barre dans une position de direction neutre (20b) qui diffère d'un angle α inférieur à 90° de la direction longitudinale (80) de la barre.
EP20120163349 2012-04-05 2012-04-05 Charriot à main et procédé pour l'amélioration de son ergonomie Active EP2647556B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20120163349 EP2647556B1 (fr) 2012-04-05 2012-04-05 Charriot à main et procédé pour l'amélioration de son ergonomie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120163349 EP2647556B1 (fr) 2012-04-05 2012-04-05 Charriot à main et procédé pour l'amélioration de son ergonomie

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EP2647556A1 EP2647556A1 (fr) 2013-10-09
EP2647556B1 true EP2647556B1 (fr) 2014-10-29

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EP20120163349 Active EP2647556B1 (fr) 2012-04-05 2012-04-05 Charriot à main et procédé pour l'amélioration de son ergonomie

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105399007A (zh) * 2015-12-23 2016-03-16 苏州先锋物流装备科技有限公司 可旋转折叠式扶手装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7314103B2 (en) * 2003-08-25 2008-01-01 Airtrax, Inc. Re-locatable operator station
US8235161B2 (en) 2007-07-06 2012-08-07 Nmhg Oregon, Llc Multiple-position steering control device
DE102009004042A1 (de) * 2009-01-08 2010-07-15 Allconsult Ltd. Flurförderzeug

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